WO2018135258A1

WO2018135258A1 - Information processing device, information recording medium, information processing method, and program

Info

Publication number: WO2018135258A1
Application number: PCT/JP2017/046703
Authority: WO
Inventors: 幸一内村; 伸一竹田
Original assignee: ソニー株式会社
Priority date: 2017-01-17
Filing date: 2017-12-26
Publication date: 2018-07-26
Also published as: JPWO2018135258A1; JP7070432B2

Abstract

The present invention creates a system that allows MMT formatted data to be recorded onto a medium and played back as BDAV or SPAV format data. A stream file constituted by a TLV packet string that stores the MMT formatted data and a playback control information file are generated and recorded onto a medium. IP dataflow identification information is recorded in the playback control information file together with a packet identifier. The IP dataflow identification information uses data made up of a source IP address or the like, or a CID or the like recorded in a compressed IP header. The IP dataflow identification information is used to select a particular IP dataflow and only one packet with the packet identifier allocated thereto can be selected from the packet group belonging to the selected flow.

Description

Information processing apparatus, information recording medium, information processing method, and program

The present disclosure relates to an information processing device, an information recording medium, an information processing method, and a program. More specifically, an MMT (MPEG Media Transport) format data, which is being standardized as a future data transmission standard in broadcast waves, etc., is input, recorded on a medium, and can be played back. The present invention relates to a medium, an information processing method, and a program.

At present, standardization for realizing high-quality image data transmission, such as broadcasting of 4K images and 8K images, is being promoted, and one of them is a data distribution method using the MMT (MPEG Media Transport) format. Is under consideration.

The MMT format is composed of encoded data that constitutes content such as images (Video), audio (Audio), and subtitles (Subtitles), control data, attribute data, and management information that are applied to content reception and playback processing, etc. Control data (SI: Signaling Information (signaling information)) and the like are defined in a data transfer method (transport format) for transmitting via broadcast waves or a network.

The MMT format is scheduled to be used for broadcasting next-generation content such as 4K images and high dynamic range (HDR) images.

Note that the MPEG-2TS format is often used as a transmission format for current images (Video), audio (Audio), subtitles (Subtitles), etc., or a data recording format for media.
Also, BDMV and BDAV standards (formats) are widely used as recording / playback application standards (formats) compatible with the MPEG-2TS format.

BDMV and BDAV are data recording / playback application standards mainly using BD (Blu-ray (registered trademark) Disc), but these standards are not limited to BD, and other standards such as flash memory and HD are also used. The present invention is also applicable to data recording / playback using media other than BD.
A data recording / playback processing configuration using BD is described in, for example, Japanese Patent Application Laid-Open No. 2011-023071.

BDMV is an application standard developed for BD-ROM in which, for example, movie content is recorded in advance, and is widely used mainly in non-rewritable BD-ROM such as package content.
On the other hand, BDAV is a standard developed for the purpose of applying to data recording / playback processing using a rewritable BD-RE type disc or a BD-R type disc that can be recorded only once. BDAV is used, for example, for recording / reproducing video captured by a user with a video camera or the like and recording / reproducing television broadcast.

In order to record distribution content in accordance with the above-described MMT format on an information recording medium (media) and perform content playback processing from the media using a playback application compatible with the BDAV format, data recording is performed in accordance with the BDAV format. It is necessary to do.

Currently, discussions are underway on a configuration for expanding the BDAV format to enable recording and reproduction of MMT format data.
For example, when an information processing device such as a television receives distribution data according to the MMT format transmitted by a broadcasting station or the like and records the received data on a recording medium such as a BD, a flash memory, or an HD (hard disk), an image, Discussions are proceeding in the direction of recording data such as audio, caption data, and control information (SI) on a medium as a packet sequence of packets storing data according to the MMT format.

Specifically, the discussion is proceeding in the direction of recording a packet sequence of a MMTP (MMT Protocol) packet or a TLV (Type Length Value) packet, which is a higher-order packet of the MMTP packet, on a medium.

The MMTP packet and the TLV packet store reproduction data such as images, audio, subtitles, and various control information (SI: Signaling Information).

For example, MMTP packets and TLV packets that store content such as images, audio, and subtitles are recorded on recording media such as BD (Blu-ray (registered trademark) Disc), flash memory, and HD (hard disk). In order to perform reproduction using the above-described reproduction application compatible with the BDAV format, it is necessary to record data in accordance with the BDAV format.

The BDAV format defines database files such as playlist files and clip information files as playback control information files, and a BDAV compatible playback application performs data playback processing with reference to these playback control information files (database files). Execute.
Therefore, it is necessary to perform reproduction processing on the MMT format data using the reproduction control information recorded in these playlist files and clip information files.

However, database files such as playlist files and clip information files defined in the BDAV format are originally defined as recording files for reproduction control information corresponding to MPEG-2TS format data.
Therefore, when playing back MMT format data having a format different from the MPEG-2TS format, normal playback may not be possible if the playback control information recorded in the playlist file or clip information file defined in the current BDAV format is applied. There is sex.

In order to record MMT format data on a recording medium such as a BD and to enable content playback using an application compatible with the BDAV format, when recording the MMT format data on the medium, It is necessary to generate a clip information file and record it on a medium.
Further, when reproducing MMT format data recorded on a medium, it is necessary to perform reproduction using a playlist file or clip information file compatible with MMT format data.
However, the current situation is that these processes are not materialized.

JP 2011-023071 A

The present disclosure has been made in view of the above-described problems, for example, to input distribution data according to the MMT format, record the data on a recording medium such as a BD, and reproduce the MMT format data from the recording medium. It is an object to provide an information processing apparatus, an information recording medium, an information processing method, and a program.

The first aspect of the present disclosure is:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The data processing unit
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
The information processing apparatus generates a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.

Furthermore, the second aspect of the present disclosure is:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
The information processing apparatus is configured to acquire reproduction target data from the TLV packet according to the recording information of the reproduction control information file and execute reproduction control.

Furthermore, the third aspect of the present disclosure is:
A clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data;
Having a playback control information file storing playback control information of the clip AV stream file as recorded data;
The reproduction control information file is
IP data flow identification information for extracting a target packet from a TLV packet included in the clip AV stream file, and a packet identifier,
Information having a data recording configuration in which a playback device that plays back the data stored in the clip AV stream file can acquire playback target data from the TLV packet sequence with reference to the IP data flow identification information and the packet identifier It is on a recording medium.

Furthermore, the fourth aspect of the present disclosure is:
An information processing method executed in an information processing apparatus,
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The data processing unit is
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
The present invention is an information processing method for generating a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.

Furthermore, the fifth aspect of the present disclosure is:
An information processing method executed in an information processing apparatus,
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit is
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
According to the information processing method, the reproduction control is performed by acquiring the reproduction target data from the TLV packet according to the recording information of the reproduction control information file.

Furthermore, the sixth aspect of the present disclosure is:
A program for executing information processing in an information processing apparatus;
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The program is stored in the data processing unit.
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
There is a program for generating a reproduction control information file in which control information enabling acquisition of a specific TLV packet from the clip AV stream file is recorded.

Furthermore, the seventh aspect of the present disclosure is:
A program for executing information processing in an information processing apparatus;
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The program is stored in the data processing unit.
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
According to the recording information of the reproduction control information file, there is a program for acquiring reproduction target data from a TLV packet and executing reproduction control.

Note that the program of the present disclosure is a program that can be provided by, for example, a storage medium or a communication medium provided in a computer-readable format to an information processing apparatus or a computer system that can execute various program codes. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the information processing apparatus or the computer system.

Further objects, features, and advantages of the present disclosure will become apparent from a more detailed description based on embodiments of the present disclosure described below and the accompanying drawings. In this specification, the system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.

According to the configuration of an embodiment of the present disclosure, a configuration in which MMT format data can be recorded on a medium as BDAV or SPAV format data and played back is realized.
Specifically, for example, a stream file composed of a TLV packet sequence storing MMT format data and a playback control information file are generated and recorded on a medium. In the reproduction control information file, the IP data flow identification information and the packet identifier are recorded together. The IP data flow identification information uses data including a source IP address or the like, or a CID recorded in a compressed IP header. A specific IP data flow is selected based on the IP data flow identification information, and a single packet with a packet identifier set can be selected from a group of packets belonging to the selected flow.
With this configuration, a configuration is realized in which MMT format data can be recorded on a medium as BDAV or SPAV format data and played back.
Note that the effects described in the present specification are merely examples and are not limited, and may have additional effects.

It is a figure explaining the utilization structural example of the information processing apparatus which performs the process of this indication. It is a figure explaining an MMT format. It is a figure explaining the example of an image data storage structure according to a MMT format. It is a figure explaining a BDAV format. It is a figure explaining the example of a data reproduction process according to a BDAV format. It is a figure explaining an MPEG-2TS format. It is a figure explaining an MMT format. It is a figure explaining a SPAV format. It is a figure explaining the process example which records the received data from a broadcasting station etc. on an information recording medium (media) as a MMTP packet sequence which is MMT format data. It is a figure explaining the example of a process recorded on an information recording medium (media) as a TLV packet sequence which stored the MMTP packet which is MMT format data for the reception data from a broadcasting station etc. FIG. It is a figure explaining the example of a process in the case of recording MMT format data as BDAV format data. It is a figure explaining the data structure of a play list file. It is a figure explaining EP map. It is a figure explaining EP map. It is a figure explaining EP map. It is a figure explaining the CPI type recording data of a play list file. It is a figure explaining the data structure of the play item of a play list file. It is a figure explaining the play item recording data of a play list file. It is a figure which shows the data structure (syntax) of an MMT package table (MPT). It is a figure explaining the specific example of the asset type (asset_type) recorded on a MMT package table (MPT). It is a figure which shows the data structure (syntax) of the MPU time stamp descriptor recorded on a MMT package table (MPT). It is a figure explaining the playlist mark which is a component of a playlist file. It is a figure explaining the recording data of playlist mark information. It is a figure which shows the data structure (syntax) of a clip information file. It is a figure which shows the data structure (syntax) of clip information [ClipInfo ()] of a clip information file. It is a figure explaining the example of a recording of the application type recorded in clip information [ClipInfo ()] of a clip information file. It is a figure explaining the example of a recording of the clip stream type recorded in clip information [ClipInfo ()] of a clip information file. It is a figure which shows the data structure (syntax) of the sequence information [SequenceInfo ()] of a clip information file. It is a figure explaining ATC and STC recorded on the sequence information [SequenceInfo ()] of a clip information file. It is a figure which shows the data structure (syntax) of the sequence information [SequenceInfo ()] of a clip information file in case reproduction | regeneration object data is MMT format data. It is a figure which shows the data structure (syntax) of the program information [ProgramInfo ()] of a clip information file. It is a figure explaining the setting example of the IP data flow of the transmission packet from a transmitter, and the setting example of a packet identifier. It is a figure explaining the setting example of the IP data flow of the transmission packet from a transmitter, and the setting example of a packet identifier. It is a figure explaining the example contained in the table contained in the transmission packet from a transmitter, and the packet identification process using a table. It is a figure which shows the data structure (syntax) of an MMT package table (MPT). It is a figure which shows the data structure (syntax) of the MMT general position information (MMT_general_location_info) of an MMT package table (MPT). It is a figure which shows the data structure (syntax) of an MMT package table (MPT). It is a figure which shows the data structure (syntax) of the MMT general position information (MMT_general_location_info) of an MMT package table (MPT). It is a figure which shows the data structure (syntax) of the program information [ProgramInfo ()] of a clip information file. It is a figure which shows the data structure (syntax) of the TLV header which is a header of a TLV packet. It is a figure which shows the data structure (syntax) of the IP header which is a header of an IP packet. It is a figure which shows the data structure (syntax) of the IP header which is a header of an IP packet. It is a figure which shows the data structure (syntax) of the compression IP header of an IP packet. It is a figure which shows the data structure (syntax) of the compression IP header of an IP packet. It is a figure which shows the data structure (syntax) of the program information [ProgramInfo ()] of a clip information file. It is a figure which shows the data structure (syntax) of the program information [ProgramInfo ()] of a clip information file. It is a figure which shows an example of the data structure (syntax) of program list table (PLT) information and MMT package table (MPT) information. It is a figure which shows an example of the data structure (syntax) of program list table (PLT) information and MMT package table (MPT) information. It is a figure which shows the data structure (syntax) of the stream coding information [StreamCodingInfo] set in the program information recording area of a clip information file. It is a figure which shows the example of a setting of the coding type of the image stream prescribed | regulated with the BDAV format, and an audio | voice stream. It is a figure explaining the example of the stream coding information [StreamCodingInfo] recording data about HEVC image data. It is a figure explaining the example of a data recording of the video format (video_format) of a clip information file. It is a figure explaining the data recording example of the frame rate (frame rate) of a clip information file. It is a figure explaining the example of a data recording of the aspect-ratio (aspect_ratio) of a clip information file. It is a figure explaining the data recording example of the audio | voice information of a clip information file. It is a figure which shows the data structure (syntax) of CPI information [CPI ()] of a clip information file. It is a figure explaining the data structure of the EP map recorded in CPI information [CPI ()] of a clip information file. It is a figure explaining the data structure of the EP map recorded in CPI information [CPI ()] of the clip information file corresponding to MMT format data. It is a figure explaining the data structure of the EP map recorded in CPI information [CPI ()] of the clip information file corresponding to MMT format data. It is a figure explaining the data structure of the EP map recorded in CPI information [CPI ()] of a clip information file. It is a figure explaining the example of a response | compatibility with the data recorded on EP map, and the structure packet of a clip AV stream file. It is a figure explaining the data structure of a MMTP packet, and a RAP flag. FIG. 25 is a diagram for describing a configuration example of an information processing apparatus that executes data recording processing on an information recording medium (media). It is a figure which shows the flowchart explaining the process sequence of the data recording process with respect to an information recording medium (media). It is a figure which shows the flowchart explaining the process sequence of the data recording process with respect to an information recording medium (media). It is a figure which shows the flowchart explaining the process sequence of the data recording process with respect to an information recording medium (media). FIG. 25 is a diagram for describing a configuration example of an information processing apparatus that executes data reproduction processing from an information recording medium (media). It is a figure which shows the flowchart explaining the process sequence of the data reproduction process from an information recording medium (media). It is a figure which shows the flowchart explaining the process sequence of the data reproduction process from an information recording medium (media). It is a figure explaining the hardware structural example of the information processing apparatus applied to the process of this indication.

The details of the information processing apparatus, information recording medium, information processing method, and program of the present disclosure will be described below with reference to the drawings. The description will be made according to the following items.
1. 1. Configuration example of communication system 2. About MMT (MPEG Media Transport) format 3. About BDAV format and SPAV format 4. Processing when recording MMT format data according to the BDAV format 5. About playlist files compatible with MMT format data 6. Clip information file compatible with MMT format data 6-1. Clip information recorded in clip information file 6-2. Sequence information recorded in clip information file 6-3. Program information recorded in clip information file 6-3-1. Example of processing for recording IP data flow identification information in program information of clip information file 6-3-2. Example of processing for recording PLT information and MPT information in program information of clip information file 6-3-3. Stream coding information recorded in program information of clip information file 6-4. 6. CPI information recorded in clip information file 7. Configuration and processing of information processing apparatus that executes data recording processing on information recording medium 8. Configuration and processing of information processing apparatus that executes data reproduction processing from information recording medium 9. Configuration example of information processing apparatus Summary of composition of this disclosure

[1. Communication system configuration example]
First, an example of a communication system, which is an example of a usage configuration of an information processing apparatus that executes the processing of the present disclosure, will be described with reference to FIG.
The information processing apparatus 30 shown in FIG. 1 is loaded with media such as a BD (Blu-ray (registered trademark) Disc), flash memory, and hard disk (HDD), and performs data recording processing for these mounted media, The data reproduction process is executed.

The data recorded on the medium by the information processing apparatus 30 is transmission content provided by the transmission apparatus 20 such as the broadcast station (broadcast server) 21 or the data distribution server 22, for example. Specifically, it is a broadcast program provided by a television station.
These transmission contents are transmitted from the transmission device 20 to the information processing device 30 via a broadcast wave or a network such as the Internet.

The information processing device 30 is, for example, a BD player 31, a television 32, a PC 33, a portable terminal 34, etc. These information processing devices are, for example, a BD (Blu-ray (registered trademark) Disc) 41, an HDD (hard disk) 42, and the like. Various media such as the flash memory 43 are mounted, and data recording processing and data reproduction processing from these media are executed.

Data transmission from the transmission device 20 to the information processing device 30 is executed in accordance with an MMT (MPEG Media Transport) format.
The MMT format is a data transfer method (transport format) for transmitting encoded data, which is content configuration data, such as images (Video), audio (Audio), subtitles (Subtitles), etc., via a broadcast wave or a network. It is specified.

The transmission apparatus 20 encodes the content data, generates a data file including the encoded data and the metadata of the encoded data, and stores the generated encoded data in an MMTP (MMT Protocol) packet defined in the MMT. Transmit via broadcast wave or network.

The data provided to the information processing device 30 by the transmission device 20 is control configured by various management information such as guide information such as program guides, notification information, and control messages in addition to reproduction target data such as images, sounds, and captions. Information (SI: Signaling Information (signaling information)).

[2. About MMT (MPEG Media Transport format)]
As described above, data transmission from the transmission device 20 to the information processing device 30 is performed in accordance with the MMT (MPEG Media Transport) format.
The MMT (MPEG Media Transport) format will be described with reference to FIG.

FIG. 2 is a diagram showing a stack model in the MMT format.
In the MMT stack model shown in FIG. 2, there is a physical layer (PHY) in the lowest layer. The physical layer is divided into a broadcast layer that performs broadcast processing and a broadband layer that performs network processing.
The MMT enables processing using two communication networks, a broadcast system and a network system.

There is a TLV (Type Length Value) layer as a higher layer of the physical layer (PHY). TLV is a format defining layer that defines a multiplexing method for IP packets. A plurality of IP packets are multiplexed and transmitted as TLV packets. TLV-SI is a transmission layer of control information (SI) such as control messages according to the TLV format.

The control information (SI) is configured by setting information necessary for receiving and playing back content (program) on the information processing apparatus 30 side, guide information such as a program guide, notification information, control information, and management information. .
The control information (SI) stored in the TLV packet generated by the TLV layer is TLV-SI, which is mainly composed of control information related to reception processing.
Control information (SI) stored in the MMTP packet, which is a packet generated according to the MMT protocol (MMTP), is MMT-SI shown in the highest layer, and is mainly composed of control information related to playback control.

A UDP / IP layer is set on the TLV layer.
The UDP / IP layer can be divided into an IP layer and a UDP layer in detail, but is a layer that defines transmission for storing a UDP packet in the payload of the IP packet.
An MMT layer and a File delivery method layer are set on the UDP / IP layer.
The setting is such that the MMTP packet is stored in an IP packet and transmitted, and the method of transmitting data as an IP packet using the File delivery method, which is a data transmission method that does not use an MMTP packet, can be used together.

The following layers are set on the MMT layer.
Image (Video) data that is encoded image data in accordance with HEVC (High Efficiency Video Coding), which is an image encoding standard;
Audio data that is encoded audio data in accordance with AAC (Advanced Audio Coding) that is an audio encoding standard;
Subtitle data that is encoded subtitle data in accordance with TTML (Timed Text Markup Language) that is a subtitle encoding standard;
Control information (MMT-SI) transmitted using MMTP packets,
In addition, various applications written according to HTML5 (Hyper Text Markup Language 5),
Each of these data is stored in an MMTP packet and transmitted.

The control information (MMT-SI) is control information (signaling information) transmitted in an MMTP packet, such as setting information necessary for reproducing content (program) on the information processing device 30 side, program guide, etc. It consists of various management information such as guidance information, notification information, and control information.

Note that time information (NTP: Network Time Protocol) is absolute time information and is directly stored in a UDP packet and transmitted.
Other data services for data distribution (Data services), content downloads, etc. (Contentdownload, etc.) can be distributed using a file distribution method (File delivery method) different from MMT.

As shown in FIG. 2, control information (MMT-SI) and applications composed of various management information such as images, voices, subtitles, various notification information and control information, and the like are transmitted by MMTP packets.

A specific configuration example of the MMTP packet will be described with reference to FIG.
FIG. 3 shows the following four types of data configuration examples.
(A) MPU (Media Presentation Unit)
(B) MMTP payroto (c) MMTP packet (d) TLV packet

(D) A TLV packet is a packet transmitted via a broadcast wave or a network, and each header information of a UDP header, an IP header, and a TLV header is set in the TLV packet. The TLV packet is set as an individual packet for each data type.

That is, one type of data is stored in the TLV payload of one TLV packet. Specifically, for example, image (V), audio (A), caption (S), or control information (SI) including various management information is individually stored.
Control information (SI) includes control information (MMT-SI) stored in the MMTP packet and control information (TLV-SI) transmitted in the TLV packet, which are stored in different individual TLV packets. .

An example of the TLV payload that is the payload of the TLV packet is the MMTP packet shown in FIG.
The MMTP packet shown in FIG. 3C includes an MMTP header and an MMTP payload.

One type of data is stored in the MMTP payload of one MMTP packet. Specifically, for example, image (V), audio (A), caption (S), control information (MMT-SI) stored in the MMTP packet, and any one of these data is an individual MMTP packet. Stored in

FIGS. 3A and 3B show the detailed configuration of image data stored in the MMTP payload of the MMTP packet shown in FIG.
FIG. 3B shows only the MMTP payload shown in FIG. 3C selected with the MMTP payload being image data (V).
The MMTP payload shown in FIG. 3B is composed of a header and a data unit.

As shown in FIG. 3A, the data unit stores image data and the following various parameters.
AU Delimiter (Access Unit Delimiter)
SPS (Sequence Parameter Set)
PPS (Picture Parameter Set)
SEIs (Supplemental Enhancement Information)
These parameters are parameters used for image display.

The MPU (Media Presentation Unit) shown in FIG. 3A is one data processing unit of reproduction target data such as images, sounds, and captions in the MMT format. The example shown in FIG. 3A is an example of an MPU of image data, and is the same unit as a GOP (Group of Pictures) as a so-called encoding / decoding processing unit.

Thus, for example, as shown in FIG. 3A, the image data is divided into parameters and image configuration data defined in the MMT format, stored in the MMTP payload shown in FIG. It is configured as an MMTP packet shown in c).
Furthermore, the MMTP packet is set as the payload of the TLV packet shown in FIG. 3D, and the TLV packet is transmitted via a broadcast wave or a network.

It should be noted that MMTP packets and TLV packets in units of data types are also set and transmitted for each data such as voice and caption, and each MMT-SI data.
The TLV-SI is stored in the TLV packet without being stored in the MMTP packet and transmitted.

[3. About BDAV format and SPAV format]
Next, BDAV, which is a recording data format in the case of recording and reproducing the distribution content in accordance with the above MMT format on, for example, a BD (Blu-ray (registered trademark) Disc), flash memory, or HD (hard disk or other media) The format and SPAV format will be described with reference to FIG.

For example, when playing back content such as images, audio, and subtitles from media such as BD (Blu-ray (registered trademark) Disc), flash memory, and HD, playback control information for performing playback processing of these content And index information is required. The reproduction control information and index information are generally called a database file.
These playback control information and index information differ depending on the playback application that executes the playback processing of the recording data of the media.

As described above, there are BDMV and BDAV standards (data recording formats) as the current recording / playback application standards (= data recording formats). These application standards are established as data recording / reproducing application standards mainly using BD (Blu-ray (registered trademark) Disc).

Note that BDMV and BDAV are data recording / playback application standards mainly using BDs, and are data recording formats (standards), but these standards are not limited to BDs, but other BDs such as flash memories. The present invention can also be applied to data recording / playback using media.
BDMV is an application standard developed for BD-ROM in which, for example, movie content is recorded in advance, and is widely used mainly in non-rewritable BD-ROM such as package content.
On the other hand, BDAV is a standard developed for the purpose of applying to data recording / playback processing using a rewritable BD-RE type disc or a BD-R type disc that can be recorded only once. BDAV is used, for example, for recording / reproducing video captured by a user with a video camera or the like and recording / reproducing television broadcast.

In order to perform content reproduction processing from a medium on which distribution content according to the above-described MMT format is recorded using a reproduction application compatible with the BDAV format, it is necessary to perform data recording according to the BDAV format.
As described above, the BDAV format defines playlist files, clip information files, and the like as recording files for playback control information, and the BDAV compatible playback application uses the recording information of these playback control information files (database files). The data reproduction process is executed using the data.

FIG. 4 is a diagram showing an example of a directory structure of data recorded on the information recording medium (medium) 40 in accordance with the BDAV format.
As shown in FIG. 4, various management information, reproduction control information, and reproduction target data storage files are set in the directory.

The management information file includes, for example, an info file (info), a menu file (menu), a mark file (mark), and the like shown in FIG. These store mainly title management information to be shown to the user.
Also, as a playback control information file,
Playlist file (playlist),
Clip information file (clipinf)
For example, these files are recorded.
Further, a clip AV stream file (stream) is recorded as a reproduction data storage file.

The playlist file is a file that defines the playback order of contents in accordance with the program information of the playback program specified by the title. For example, the playlist file includes specification information of a clip information file that records playback position information and the like.
The clip information file is a file specified by the playlist file, and has reproduction position information of the clip AV stream file.

The clip AV stream file is a file storing AV stream data to be reproduced and management information. A clip AV stream file is composed of a packet storing management data, each piece of data such as an image, audio, and caption to be reproduced.
As management information defined in the MPEG-2TS format and recorded in a clip AV stream file, for example, there is PSI / SI (Program Specific Information / Service Information).

Note that conventional broadcast data and network distribution data are MPEG-2TS format data composed of TS (Transport Stream) packets, but data including high-definition images such as 4K and 8K images in the future are described above. It is expected to be MMT format data composed of MMTP packets.

In FIG. 4, as a clip AV stream file (stream),
A stream file (nnnnn.m2ts) composed of MPEG-2 TS format data composed of TS packets,
MMT format data (nnnnnn.mmtv) composed of MMTP packets,
These two types of stream files are shown.

In the example of the directory shown in FIG. 4, when the data received by the information processing apparatus 30 is MPEG-2TS format data, it is recorded as it is on the medium as MPEG-2TS format data, and when the received data is MMT format data. This is a directory example in the case of setting to record on media as MMT format data.

It should be noted that the discussion is progressing in the direction of recording a clip AV stream file when MMT format data is recorded on a medium as a packet sequence of packets storing data according to the MMT format.
Specifically, the discussion is proceeding in the direction of recording as a packet string of an MMTP (MMT Protocol) packet or a TLV (Type Length Value) packet that is an upper packet of the MMTP packet.
This specific example will be described in detail later.

Management information file, playlist file, clip information file, and these data files are management information storage files applied to playback processing of images, audio, subtitles, and the like, which are playback data stored in the clip AV stream file. These are files that store reproduction control information, reproduction data attribute information, and the like, and are called database files.

The sequence for reproducing the content recorded on the information recording medium is as follows.
(A) First, a specific title is designated from the management information file by the reproduction application.
(B) A playlist associated with the designated title is selected.
(C) The AV stream or the command as the actual content data is read out by the clip information defined in the selected playlist, and the AV stream is reproduced and the command is executed.

FIG. 5 shows the following data recorded on the information recording medium (medium) 40, that is,
Playlist files,
Clip information file,
Clip AV stream file,
It is a figure explaining the correspondence of these data.

An AV stream made up of reproduction target data such as images, sounds, and subtitles as actual reproduction target data is recorded as a clip AV stream (Clip AV Stream) file, and further, as management information and reproduction control information file of these AV streams. , A playlist (PlayList) file and a clip information (Clip Information) file are defined.

These multiple categories of files are shown in FIG.
A playlist layer including a playlist (PlayList) file,
A clip layer consisting of a clip AV stream (Clip AV Stream) file and a clip information (Clip Information) file,
It can be divided into these two layers.

One clip AV stream (Clip AV Stream) file is associated with one clip information (Clip Information) file, and these pairs are considered as one object, and these are grouped into a clip (Clip) or a clip. Called a file.
Detailed information of data included in the clip AV stream file, for example, management information such as an EP map in which I picture position information of MPEG data is recorded is recorded in the clip information file.

Note that a clip AV stream file is composed of TS packets in the case of MPEG-2 TS format data.
Further, in the case of MMT format data, it is composed of MMTP packets.

The clip information (Clip Information) file includes, for example, the data position of the byte sequence data of the clip AV stream file and the playback time position such as the playback start point (entry point: EP) when expanded on the time axis. The management information for acquiring the reproduction start position of the data stored in the clip AV stream file, such as corresponding data, is stored.

The playlist has information indicating an access point corresponding to a playback start position or playback end position of a clip (Clip) with a time stamp which is information on the time axis.
For example, it is possible to acquire a data read position of a clip AV stream file, that is, an address as a playback start point by referring to the clip information file based on a time stamp indicating a playback time elapsed position from the start point of the content. Become.
The clip information file (Clip Information file) is used to find address information from which to start decoding the stream in the clip AV stream file from this time stamp.

In this way, the playlist (PlayList) file has playback section designation information for playable data included in the clip (= clip information file + clip AV stream file) layer.
In the playlist (PlayList) file, one or more play items (PlayItem) are set, and each play item is a playback section for playable data included in a clip (= clip information file + clip AV stream file) layer. Specified information.

Note that, as described above, a clip AV stream file that stores data to be played is composed of TS packets in the case of conventional MPEG-2 TS format data.
Further, in the case of high-definition image data such as 4K and 8K images that are expected to be used in the future, in the case of MMT format data, it is constituted by MMTP packets.
The MMT format and the MPEG-2TS format will be described with reference to FIGS.

First, the MPEG-2TS format will be described with reference to FIG.
The MPEG-2TS format stores encoded data and management information (PSI / SI), which are content configuration data, such as images (Video), audio (Audio), subtitles (Subtitles), etc. in a recording medium (media), broadcast waves, This is a format that defines a data storage format (container format) for encoded data and the like for transmission over a network.

The MPEG-2TS format is a format standardized by ISO13818-1, and is used for data recording, digital broadcasting, and the like for BD (Blu-ray (registered trademark) Disc), for example.

FIGS. 6A to 6C are diagrams showing the structure of MPEG-2TS format data.
FIG. 6A shown at the bottom is a diagram showing the overall structure of MPEG-2TS format data.
As shown in FIG. 6A, the MPEG-2TS format data is composed of a plurality of elementary streams (Elementary streams).
An elementary stream is a unit that is set as one unit such as an image, sound, or caption.

One elementary stream (Elementary stream) is composed of one or more PES (Packetized Elementary stream) packets as shown in FIG. 2 (b).
Specifically, one elementary stream is composed of one or a plurality of PES packets having a payload type (Payload_type) = 0x0 and the same packet identifier (Packet_id).

One PES packet is composed of one or a plurality of TS packets as shown in FIG.
Specifically, one PES packet is composed of one or a plurality of TS packets having a payload type (Payload_type) = 0x0 and the same packet identifier (Packet_id).
Unlike the MMTP packet described above, the TS packet has a fixed length, and the packet size of one TS packet is fixed to 188 bytes.

Next, the MMT (MPEG Media Transport) format will be described with reference to FIG.
As for the MMT format, FIG. 3 has been referred to earlier, but the explanatory diagram of the MMT format shown in FIG. 7 is a diagram explaining the correspondence with the MPEG-2TS format described with reference to FIG. 6 in an easy-to-understand manner. is there.

As described above, the MMT format is a data transfer method for transmitting encoded data, which is content configuration data, such as an image (Video), audio (Audio), subtitle (Subtitle), etc., via a broadcast wave or a network. (Transport format) is specified.
FIG. 7 is a diagram for explaining the MMT format which is a file format defined in ISO / IEC 23008-1.

7A to 7C show the structure of MMT format data.
FIG. 7A shown at the bottom is a diagram showing the overall configuration of MMT format data.
As shown in FIG. 7A, the MMT format data is composed of a plurality of media presentation units (MPUs).
MPU is a unit set as one unit, such as an image, an audio | voice, and a subtitle, for example. For example, in the case of an image, 1 MPU corresponds to 1 GOP (Group of Picture) which is one MPEG compressed image unit.

One MPU is configured by one or a plurality of media fragment units (MFUs) as shown in FIG. 7B.
Specifically, one MPU is composed of one or a plurality of MFUs having the payload type (Payload_type) = 0x0 (MPU) and the same packet identifier (Packet_id).

One MFU is composed of one or a plurality of MMTP packets as shown in FIG.
Specifically, one MFU is composed of one or a plurality of MMTP packets having a payload type (Payload_type) = 0x0 (MPU) and the same packet identifier (Packet_id).
The MMTP packet has a variable length and can be set to various packet sizes.
Each MMTP packet includes a header (MMTP header) that stores attribute information and the like, and a payload (MMTP payload) that stores actual data of the encoded image and the like.

There is a SPAV format as a format similar to the BDAV format. As described above, BDMV and BDAV are data recording / playback application standards mainly using BD. On the other hand, SPAV format is an application standard for data recording / playback mainly for hard disks.
However, both the BDAV format and the SPAV format are formats that can be used for recording and reproduction using various media such as BD, flash memory, and HD.

SPAV format data can be recorded / reproduced by a process similar to the data recording / reproduction process in the BDAV format. However, the SPAV format is partially different from the BDAV format in the file name setting.
FIG. 8 shows a directory structure example of SPAV format.

In the SPAV format directory shown in FIG. 8, various management information, playback control information, and playback target data storage files are set, as in the BDAV format described above with reference to FIG.

As shown in FIG. 8, the setting of the directory name of SPAV format and the extension of each file is different from the BDAV format described with reference to FIG.
However, the data stored in each file and the role of each file are the same as in the BDAV format.

In the following description of the embodiment, an example of processing for recording and reproducing MMT format data as BDAV format data will be described. In the embodiment described below, processing for recording and reproducing MMT format data as SPAV format data will be described. It is also applicable to.

[4. Processing for recording MMT format data according to the BDAV format]
Next, processing when MMT format data is recorded in accordance with the BDAV format will be described.

As described above, the MMT format is a data distribution format that will be used for 4K images and the like that are scheduled to be distributed by broadcasting stations and the like in the future, and is a format according to the protocol stack described with reference to FIG. is there.
On the other hand, the BDAV format is a data recording format for media, and as described with reference to FIG. 4, a database file including playback control information files such as a playlist file and a clip information file is defined.
The BDAV format is a data recording format and also supports a data recording / playback application standard. Data playback recorded on a medium according to the BDAV format is performed using a playback application compatible with the BDAV format. The

Therefore, in order to record distribution content according to the MMT format on a medium and perform content reproduction processing from the recorded medium using a reproduction application compatible with the BDAV format, data recording according to the BDAV format may be performed. is necessary.

As described above, at present, discussions are being made on the rules for expanding the BDAV format and recording and reproducing MMT format data.
For example, when an information processing apparatus such as a television receives distribution data according to the MMT format transmitted by a broadcasting station or the like, and performs processing for recording the received data on a medium such as a BD, flash memory, or HD (hard disk), Regarding data such as image, audio, subtitle data, management information (SI), etc., discussion is proceeding in the direction of recording as it is as a packet sequence of packets storing data according to the MMT format.

In other words, the clip AV stream file [02001. set to the BDAV format shown in FIG. 4 or the SPAV format shown in FIG. mmtv etc.], the packet sequence of the packet storing the data according to the MMT format is recorded.
Note that the clip AV stream file [02001. For playlist files and clip information files that are playback control information files corresponding to “mmtv etc.”, the recording device generates playlist files and clip information files in which control information corresponding to MMT format data is set, and records them on the media. It will be. This process will be described later.

The clip AV stream file storing the MMT format data has been discussed in the direction of recording as a packet sequence of a MMTP (MMT Protocol) packet or a TLV (Type Length Value) packet that is a higher-order packet of the MMTP packet.

A specific recording configuration example of the clip AV stream file storing the MMT format data will be described with reference to FIGS.
FIG. 9 is a diagram for explaining an example of processing for recording an MMTP (MMT Protocol) packet sequence according to the MMT format on a recording medium such as a BD, a flash memory, or an HD (hard disk).

FIG. 9 shows the following three data.
(A) TLV packet sequence that is broadcast distribution data (B) One TLV packet processed as reception / playback data (C) MMTP packet sequence proposed as a configuration of media recording data

(A) A TLV packet sequence that is broadcast distribution data is a sequence (sequence) of TLV packets having the MMT (MPEG Media Transport) format described above with reference to FIG.
This TLV packet sequence is transmitted from a transmission apparatus 20 such as a broadcasting station.

(B) One TLV packet to be processed as received reproduction data is one TLV packet that is received by the information processing apparatus 30 such as a television or a recorder and performs reproduction processing. The detailed structure of one TLV packet which comprises the TLV packet sequence shown to (A) is shown.
This is a TLV packet having the MMT (MPEG Media Transport) format described above with reference to FIG.

(C) The MMTP packet sequence shown as the configuration of media recording data is an MMTP packet sequence that is currently proposed as recording data for media.
The MMTP packet recorded on the medium is an MMTP packet that is a part of the configuration data of the TLV packet, as understood from the dotted line showing the correspondence with FIG. 9B, and is composed of the following elements: .
(A) MMTP packet header (MMTP_packet_header)
(B) MMTP packet data (MMTP_packet_data) (= payload)

The MMTP packet data (MMTP_packet_data) (= payload) is composed of the following elements.
(B1) MMTP payload header (MMTP_payload_header)
(B2) MMTP payload data (MMTP_payload_data)

One configuration currently proposed as recording data for an information recording medium (medium) is to extract only MMTP packets that are constituent elements of TLV packets as shown in FIG. 9C and record them in a line. It is the structure to do.

FIG. 10 is a diagram for explaining an example of processing for recording a packet sequence of higher-order TLV packets storing MMTP packets, not MMTP (MMT Protocol) packets, on a recording medium such as a BD, flash memory, or HD (hard disk). It is.

FIG. 10 shows the following three data as in FIG.
(A) TLV packet sequence which is broadcast distribution data (B) One TLV packet processed as reception / playback data (C) TLV packet sequence proposed as a configuration of media recording data

(A) and (B) are the same data as described with reference to FIG.
(C) The TLV packet sequence shown as the configuration of media recording data is a TLV packet sequence that is another example currently proposed as recording data for media.
The TLV packet recorded on the medium is a TLV packet including the MMTP packet, and is composed of the following elements, as can be understood from the dotted line showing the correspondence with FIG.
(A) TLV packet header (TLV_header)
(B) TLV packet data (TLV_data) (= payload)

Thus, as a recording mode of MMT format data for media such as BD,
MMTP (MMT Protocol) packet sequence described with reference to FIG. 9, or
A packet sequence of a TLV (Type Length Value) packet described with reference to FIG.
Discussion is proceeding in the direction of recording as one of these packet sequences.

When MMT format data is recorded on a medium with the settings shown in FIG. 9 or FIG. 10 and playback processing of MMT format data is performed using a playback application that supports the BDAV format, a playback control information file that supports the BDAV format That is, reproduction is performed using a playlist file or clip information file.
The BDAV format is a data recording format and also supports a data recording / reproducing application standard, and reproduction of data recorded on a medium according to the BDAV format is executed using a reproducing application compatible with the BDAV format.

The BDAV format defines BDAV format-specific database files such as playlist files and clip information files that are playback control information files, and the BDAV compatible playback application uses the recording information of these playback control information files (database files). The data reproduction process is executed using the data.

As described above, database files such as playlist files and clip information files defined in the BDAV format are originally defined as files that can be generated based on the distribution data in the MPEG-2TS format.
Therefore, even if the distribution data according to the MMT format, which is different from the MPEG-2TS format, is recorded as it is in the playlist file or clip information file stipulated in the current BDAV format, it cannot be used by the current BDAV compatible playback application. It may become.

In order to record the MMT format data on the medium and perform the content reproduction using the BDAV format compatible application, when the MMT format data is recorded on the medium, the playlist file or clip corresponding to the MMT format data is used. It is necessary to generate an information file and record it on a medium.
Further, when reproducing MMT format data recorded on a medium, it is necessary to perform reproduction using a playlist file or clip information file compatible with MMT format data.

Specifically, as shown in FIG. 11, a clip information file (nnnnn.clpi) 72 corresponding to the MMT format data storage clip AV stream file 71 and a playlist file (nnnnn.rpls) 73 are generated and the media ( BD, flash memory, HDD, etc.) and processing for use in reproduction is required.

When reproducing the MMT format data storage clip AV stream file 71 recorded on the medium, the clip information file (nnnnnn.clpi) 72 corresponding to the MMT format data storage clip AV stream file 71 and the playlist file (nnnnn. rpls) 73 can be used to perform the playback process.

However, as described above, the data distributed according to the MMT format, which is the distribution data of the broadcasting station, is not configured to include all the recording data of the playlist file and the clip information file specified in the BDAV format.
Further, the MMT format data storage clip AV stream file 71 has a data format different from that of the MPEG-2TS format data, such as a playlist file corresponding to the MPEG-2TS format data and a playlist file having the same format as the clip information file. Even if a clip information file is used, there is a problem that correct reproduction processing cannot be executed.

Therefore, in order to record this MMT format data on a medium and perform content playback using a BDAV format compatible application, playback control of the MMT format data storage clip AV stream file 71 can be performed. It is necessary to generate a playlist file or clip information file having the data format and record it on the medium.
Hereinafter, this specific process will be described.

As described above with reference to FIGS. 9 and 10, the recording mode of MMT format data on a medium such as a BD, that is, the MMT format data storage clip AV stream file 71 shown in FIG.
MMTP (MMT Protocol) packet sequence, or
Packet sequence of TLV (Type Length Value) packet,
Discussion is proceeding in the direction of recording as one of these packet sequences.

In the following, a playlist file or clip information file corresponding to the MMT format when the MMT format data storage clip AV stream file 71 is recorded as a packet sequence of the TLV (Type Length Value) packet described with reference to FIG. A specific configuration example will be described.

[5. About playlist files compatible with MMT format data]
First, a playlist file corresponding to MMT format data will be described with reference to FIG.

As described above, information on data to be reproduced by applying the playlist is recorded in the playlist file. Specifically, for example, it includes information relating to a play item to be applied to content reproduction processing, and further information specifying a clip information file in which reproduction position information and the like are recorded.

FIG. 12 is a diagram illustrating a data configuration (syntax) of [PlayList] recorded in one play list (PlayList) file.
The number of bits (No. of bits) and the data notation (Mnemonic) are shown together with the data structure (Syntax).
Note that “uimsbf” in data notation means “unsigned integer most significant bit first” notation.
“Bslbf” means “bit string, left bit means first (bit string, left bit first)”.

The main recording data of [PlayList] shown in FIG. 12 will be described.
The length indicates the number of bytes from immediately after this length field to the end of the playlist file configuration data.

PL_CPI type (PL_CPI_type) 101 is information indicating a CPI type in a clip information file referred to by a play item (PlayItem) defined in the playlist file.

The number of play items (number_of_PlayItems) 102 indicates the number of play items (PlayItems) defined in the playlist file.
The number of sub play items (number_of_SubPlayItems) 103 indicates the number of play items (PlayItems) defined in the play list file.
In the play item information (PlayItem ()) 104, detailed information of each play item and sub play item is recorded.

As described above, the PL_CPI type (PL_CPI_type) 101 is information indicating the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file.
CPI (Characteristic Point Information) is recording data of a clip information file, for example, data for acquiring a data address of a playback start point at which random access playback can be started.

The CPI defined in the BDAV format includes, for example, different types of maps such as an EP map (EP_map) and a TU map (TU_map).
Each of these maps is data corresponding to, for example, playback time information (PTS: Presentation Timestamp) serving as a random access point and a source packet number (SPN: Source Packet Number) that is a packet identifier of the packet at that position. This is map information that can be used to obtain a packet storing reproduction data of a random access point.

Both the EP map and the TU map are map data in which random access point information is recorded. The EP map is map data in which finer random access point information is recorded, and the TU map is rougher than the EP map. This is map data in which random access point information is recorded.
In the BDAV format, two types of maps, an EP map and a TU map, are defined, but the TU map is hardly used, and only the EP map is currently used.
EP_map and TU_map have address information for finding the location of the entry point (EP) where decoding should start in the AV stream.

The EP map will be described with reference to FIG.
As described above with reference to FIG. 5, the playlist has information indicating the access point corresponding to the playback start position and playback end position of the clip (Clip) with a time stamp which is information on the time axis. .
The clip information file (Clip Information file) is used to find address information from which to start decoding the stream in the clip AV stream file from this time stamp.

Further, the clip information file (Clip Information file) has an EP map (EP_map) shown in FIG.
The EP map records access point information corresponding to the playback start position and playback end position where random playback can be started in the playback data stored in the clip AV stream file.
That is, in the EP map, correspondence data between a time stamp representing the reproduction start position on the time axis and address information for packet acquisition corresponding to the packet position information is recorded.

In particular,
(A) a time stamp (PTS: Presentation Timestamp) representing the access point on the time axis;
(B) A source packet number (SPN: Source Packet Number) corresponding to an address indicating a packet position in the clip AV stream.
It has these correspondence information.

By referring to the EP map having such correspondence information, a corresponding address (SPN) is obtained based on the time stamp, and, for example, a decoding start point that is a reproduction start position in the AV stream according to the address (SPN) Can be found.

FIG. 14 is a diagram for explaining a specific configuration and usage example of the EP map (EP_map). In the clip AV stream (Clip AV stream) shown in FIG. 14A, a video stream composed of source packets identified by a packet identifier: PID is multiplexed. The video stream is distinguished for each source packet by the PID included in the header of the transport packet in the source packet.

The source packet of the video stream has an IPB picture constituting MPEG data, that is, an I (Intra) picture, a P (Predictive) picture, and a B (Bidirectionally predictive) picture. The I picture is picture data that can be decoded independently, and other P pictures and B pictures require reference to the preceding and following I pictures when decoding. For example, the reproduction start point by random access is set at a packet position having an I picture that can be independently decoded.

The EP map holds position information of an I picture as reproduction start point position information that can be accessed at random, as correspondence data between the above-described PTS and SPN. That is,
(A) a time stamp (PTS: Presentation Timestamp) representing the access point on the time axis;
(B) A source packet number (SPN: Source Packet Number) corresponding to an address indicating a packet position in the clip AV stream.
This is correspondence information.

Referring to the EP map set as described above, the location of the I picture, which is the playback start position that can be accessed randomly, can be obtained. The EP map (EP_map) is data included in the clip information file.

The detection of the I picture position based on the EP map will be described with reference to FIG. FIG. 14A shows a clip AV stream, and each rectangle shows a 192-byte source packet.

In FIG. 14A, a source packet including the first byte of an I (Intra) picture is indicated by a hatched square. White squares without diagonal lines indicate source packets containing data that cannot be random access points, and source packets containing data of other streams.

For example, the source packet of the source packet number X1 including the first byte of the randomly accessible I picture of the video stream distinguished by PID = x is arranged at the position of PTS = pts (x1) on the time axis of the clip AV stream. Is done. Similarly, the source packet including the first byte of the I picture that can be accessed at random next is the source packet of the source packet number X2, and is arranged at the position of PTS = pts (x2).

As shown in FIG. 14B, the source packet is configured by adding a 4-byte header (TP_extra_header) to a 188-byte transport packet. The transport packet part includes a header part (TP header) and a payload part.

SPN_EP_start which is EP map registration data shown in FIG. 14C2 is a source packet number (SPN) of a source packet including the first byte of an access unit (Access Unit) including an I picture starting from a sequence header (SQH). Represents.
A series of numbers set for all packets in the clip AV stream file is a source packet number (SPN). In the clip AV stream file, the source packet number of the first source packet is zero, the source packet number of the next packet is 1, and thereafter, the source packet number is incremented by 1 for each next packet.

As shown in FIG. 14 (C2), the EP map (EP_map) is
Stream PID (Stream_PID),
EP entry number (number_of_EP_entries),
Presentation time stamp EP start (PTS_EP_start), and
Source packet number EP start (SPN_EP_start),
These data are recorded.

The stream PID (Stream_PID) is a packet identifier (PID) of a transport packet that transmits a video stream.
The number of EP entries (number_of_EP_entries) is the number of entries of a pair of PTS_EP_start and SPN_EP_start included in EP_map.

The presentation time stamp EP start (PTS_EP_start) represents an access unit PTS (presentation time stamp) starting from a randomly accessible I picture.
The source packet number EP start (SPN_EP_start) represents a source packet number (SPN: Source Packet Number) including the first byte of the access unit (Access Unit) referred to by the value of PTS_EP_start.

The value of the PID (packet identifier) of the video stream is stored in stream_PID, and EP_map () that is table information indicating the correspondence between PTS_EP_start and SPN_EP_start is generated.
For example, in the EP map of a video stream with PID = x,
PTS = pts (x1) and source packet number (SPN) X1,
PTS = pts (x2) and source packet number (SPN) X2,
...
PTS = pts (xk) and source packet number (SPN) Xk,
A table including correspondence data of these PTS and SPN is described.
An EP map (EP_map) including the above table is stored in a clip information file corresponding to one clip AV stream.

The EP map (EP_map) having such data is referred to, for example, to specify the decoding start position when performing random access or the like.
With reference to FIG. 15, a description will be given of a method of calculating address information to start decoding a stream in a clip AV stream file using EP_map when playback is started from time x on the time axis in the clip. .

As shown in FIG. 15, when the playlist (PlayList) has information specifying start of reproduction from time x on the time axis in the clip, the time stamp [PTS_EP_start [m] having the closest value smaller than x ] Is specified.
Based on the time stamp [PTS_EP_start [m]] specified according to the playlist information, the EP map in the clip information file is referred to, and the source packet number [SPN_EP_start [m] corresponding to the time stamp [PTS_EP_start [m]]. ]] Is specified.

Thus, using the EP map, the SPN that is the packet position information corresponding to the PTS, that is, [SPN_EP_start [m]] is acquired from the PTS that is the reproduction time information determined according to the playlist information.
This packet position [SPN_EP_start [m]] can be acquired as a reproduction start point in the clip AV stream file, that is, address information to start decoding, and can be reproduced by performing decoding processing.

The usage example of the EP map described with reference to FIG. 13 to FIG. 15 is a packet acquisition processing example corresponding to a random access point using MPEG-2TS format data. In this way, in the MPEG-2TS format data, using the EP map, from the PTS that is the reproduction time information determined according to the playlist information, the SPN that is the packet position information corresponding to the PTS, that is, [SPN_EP_start [ m]].

However, since the MMT format data has a format different from that of the MPEG-2TS format data, it is impossible to execute a process similar to that of the MPEG-2TS format data to obtain a random access point compatible packet.
That is, when the reproduction target data is MMT format data, it is necessary to perform data processing corresponding to MMT format data different from the above-described processing.

The EP map is defined in the clip information file, and it is necessary to record the MMT format data compatible EP map for executing the random access point acquisition processing corresponding to the MMT format data in the clip information file compatible with the MMT format data. is there.
That is, it is necessary to record the EP map corresponding to the MMT format data in the clip information file (nnnnnn.clpi) 72 corresponding to the MMT format data storage clip AV stream file 71 shown in FIG. This specific example will be described later.

Thus, the EP map corresponding to the MPEG-2TS format data is different from the EP map corresponding to the MMT format data.
As described with reference to FIG. 12, the PL_CPI type (PL_CPI_type) recorded in the playlist file shown in FIG. 12 is included in the clip information file referenced by the play item (PlayItem) specified in the playlist file. This is information indicating the CPI type.

CPI (Characteristic Point Information) is recording data of a clip information file, and is an area for recording data indicating the type of EP map or TU map for obtaining a data address of a playback start point (random access point).

In the conventional PL_CPI type (PL_CPI_type), identification information of an EP map and a TU map corresponding to MPEG-2TS format data is recorded.
However, the EP map corresponding to the MMT format data is different from the EP map corresponding to the MPEG-2TS format data so far.
Therefore, it is necessary to set an identifier that distinguishes the PL_CPI type (PL_CPI_type) of the playlist file.

FIG. 16 shows the following CPI type recording data.
(1) Conventional CPI type recording data (only MPEG-2TS compatible data is recorded)
(2) New CPI type recording data (recording MPEG-2TS compatible data and MMT compatible data)

The data shown in “(1) Conventional CPI type recording data (recording only MPEG-2TS compatible data)” in FIG. 16 is data defined as the PL_CPI type (PL_CPI_type) of the conventional playlist file.
PL_CPI type (PL_CPI_type) = 1 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in this playlist file is an EP map compatible with MPEG-2TS.
PL_CPI type (PL_CPI_type) = 2 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file is an MPEG-2TS compatible TU map.

As described above, conventional CPI type recording data records only MPEG-2TS compatible data.
“(2) New CPI type recording data (recording MPEG-2TS compatible data and MMT compatible data)” in FIG.
PL_CPI type (PL_CPI_type) = 3
The bit value = 3 is added.

PL_CPI type (PL_CPI_type) = 3 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file is an MMT-compliant EP map.
In this way, three types of definition of PL_CPI type (PL_CPI_type) = 1 to 3 are possible, and the three CPI types can be identified.

Next, details (syntax) of the play item information (PlayItem ()) 104 recorded in [PlayList] described above with reference to FIG. 12 will be described with reference to FIG.
As described above, the play item information (PlayItem ()) 104 records detailed information of each play item and sub play item.

FIG. 17 is a diagram illustrating a data configuration (syntax) of play item information (PlayItem ()) 104.
In the clip information file name (Clip_Information_file_name) 111, the file name of the clip information file to be applied to the reproduction processing using this play item is recorded.

The reference STC identifier (ref_to_STC_id) 112 indicates an STC identifier of an STC (system time clock) continuous section to be referred to by this play item.
STC (system time clock) is a reference clock for AV stream playback, and one STC is used in a continuous playback section. For example, one STC is used in a continuous playback section in which one play item is played, and different STCs are referred to by switching play items.
In the reference STC identifier (ref_to_STC_id) 112, information specifying an STC (system time clock) to be referred to by the play item is recorded.

The start time (IN_time) 113 is a recording area of the play item playback start time.
The end time (OUT_time) 114 is a recording area for the play end time of the play item.
When the conventional MPEG-2TS format data is to be reproduced, these start time and end time information are the difference time information (45 KHzh from the start time of the STC corresponding to the play item specified by the reference STC identifier (ref_to_STC_id) 112. Clock) is recorded.
The 45 KHz clock is a general clock used for recording / reproducing MPEG-2TS format data.

However, when the reproduction target data is MMT format data, unlike the MPEG-2TS format data, each reproduction target data (MMT format data) corresponding to a play item is not associated with an individual STC. .
Therefore, the MMT format data is recorded in the play item information (PlayItem ()) of the playlist to be reproduced.
Start time (IN_time) 113,
End time (OUT_time) 114 is
It is necessary to set time information unique to the MMT format data.
An example of this change will be described with reference to FIG.

FIG. 18 shows the following data example.
(1) Conventional play item information recording data (MPEG-2TS compatible playlist)
(2) New play item information recording data (MMT compatible playlist)

“(1) Conventional play item information recording data (MPEG-2TS compatible playlist)” shown in FIG. 18 (1) is the play item information (PlayItem ()) when the reproduction target data is MPEG-2TS format data. The recorded data of the start time (IN_time) and the end time (OUT_time) recorded in FIG.

The start time (IN_time) is playback start time information of the play item (PlayItem) playback start point, and as described above, STC [system time clock (45 KHz clock)] applied to the playback processing using this play item. ) Record the elapsed time information from the starting point. The STC is an STC specified by the reference STC identifier (ref_to_STC_id) 112 described with reference to FIG.

The end time (OUT_time) is the playback end time information of the play item (PlayItem) playback end point. As described above, the STC [system time clock (45 KHz clock) applied to the playback processing using this play item. )]) Record the elapsed time information from the starting point. The STC is an STC specified by the reference STC identifier (ref_to_STC_id) 112 described with reference to FIG.

“(2) New play item information recording data (MMT compatible playlist)” shown in FIG. 18 (2) is recorded in the play item information (PlayItem ()) when the reproduction target data is MMT format data. The recording data of start time (IN_time) and end time (OUT_time) is shown.

The start time (IN_time) is playback start time information of a play item (PlayItem) playback start point. When the reproduction target data is MMT format data, time information according to NTP (Network Time Protocol) is recorded.
The end time (OUT_time) is playback end time information of the play item (PlayItem) playback end point. When the reproduction target data is MMT format data, time information according to NTP (Network Time Protocol) is recorded.

The time information according to NTP (Network Time Protocol) is transmitted together with MMT format data including broadcast content transmitted by the transmission device 20 such as the broadcast server (broadcast station) 21 shown in FIG.
The information processing apparatus 30 such as a television (TV) 32 acquires time information according to NTP (network time protocol) transmitted by the transmission apparatus 20 and records it in a playlist.

For example, the transmission apparatus 20 uses MPU (Media Presentation Unit) unit playback time information, which is one data processing unit in the MMT format described above with reference to FIG. 3, as time according to NTP (Network Time Protocol). The control information recorded as information is transmitted together with the reproduction target data (program content).
A specific example will be described with reference to FIG.

For example, an information processing device 30 that receives distribution content (program) from a transmission device 20 such as a broadcast server (broadcast station) 21 shown in FIG. 1 as MMT format data and records the received content on an information recording medium (media). It is necessary to extract various information from the received data to generate a playlist file and a clip information file.

As described above with reference to FIG. 2 and others, the MMT format data includes control information necessary for receiving and playing back content (program) on the information processing apparatus 30 side, and guide information such as a program guide. Control information (signaling information) including notification information, management information, and the like.
Control information (signaling information) defined in the MMT format includes signaling information (MMT-SI) transmitted in MMTP packets and signaling information (TLV-SI) transmitted in TLV packets.

The information processing apparatus 30 that receives MMT format data and records the received data on a medium extracts various information from signaling information such as TLV-SI and MMT-SI included in the MMT format, for example, and plays a playlist file. And a clip information file.

One of the signaling information (MMT-SI) transmitted by the MMTP packet is an MMT package table (MPT: MMT Package Table). The MMT package table (MPT) is a table in which, for example, data attribute information (asset descriptor) is recorded in detail for each data type (asset type) such as image, audio, subtitle, and the like.
Note that the packet ID of the MMT package table (MPT: MMT Package Table) is stored in the MMTP packet of packet ID = 0x0000, and the information processing apparatus stores the packet stored in the MMT package table (MPT) based on the packet ID. Can be determined.

The structure of the MMT package table (MPT: MMT Package Table) will be described with reference to FIG.

FIG. 19 is a diagram illustrating a data configuration (syntax) of an MMT package table (MPT).
As described above, the MMT package table (MPT: MMT Package Table) defined in the MMT format is, for example, data attribute information (asset descriptor) for each data type (asset type) such as image, audio, subtitle, etc. There is a table that records in detail.

In the MMT package table (MPT), as shown in FIG.
Asset type (asset_type)
Asset descriptor (asset_descriptors_byte)
These data recording areas are included.

The asset type (asset_type) is an area for recording an identifier for each data type, such as an image, audio, or caption. An asset is a unit of data processing having a common attribute, and images, audio, subtitles, and the like are set as different assets.
A specific example of the asset type (asset_type) recorded in the MMT package table (MPT) is shown in FIG.

As shown in FIG. 20, the asset type (asset_type) recorded in MPT includes, for example, the following types.
hvc1: HEVC image mp4a: audio stpp: subtitles, etc. aapp: application In the MPT asset type (asset_type) recording field shown in FIG. 19, for example, any of the above type information is recorded.

As shown in the lower part of the MPT in FIG.
Asset descriptor (asset_descriptors_byte)
In this field, various asset information corresponding to each asset type (for example, image, audio, subtitle) and their data types are recorded.

One piece of information recorded as the asset descriptor (asset_descriptors_byte) includes reproduction time information such as an image and sound.
The reproduction time information is recorded as time information according to NTP (Network Time Protocol).

FIG. 21 shows the data structure (syntax) of an MPU time stamp descriptor in which playback time information (time stamp) in units of MPU recorded as asset descriptors (asset_descriptors_bytes) is recorded in the MMT package table (MPT).

Note that the MPU is the MPU (Media Presentation Unit) shown in FIG. 3A as described above with reference to FIG. 3, and is one data processing unit in the MMT format. The example shown in FIG. 3A is an example of an MPU of image data, and is the same unit as a GOP (Group of Pictures) as a so-called encoding / decoding processing unit.

The MPU time stamp descriptor recorded in the MMT package table (MPT) corresponds to the reproduction time information in units of MPU.
As shown in FIG. 21, the following data is recorded in the MPU time stamp descriptor.
MPU sequence number (MPU_sequence_number)
MPU playback time (MPU_presentation_time)

An MPU identifier is recorded in the MPU sequence number (MPU_sequence_number).
At the MPU playback time (MPU_presentation_time), the playback time (presentation time) of the MPU is recorded as time information according to NTP (Network Time Protocol).
The NTP time (NTP time stamp) is, for example, absolute time information of 64-bit data, that is, absolute time information indicating an elapsed time from a predetermined reference time. The upper 32 bits indicate time information (elapsed time information) of 1 second or more, and the lower 32 bits indicate time information (elapsed time information) of 1 second or less.
It is also possible to set the whole to 32 bits and use short-format NTP time information that indicates time information of 1 second or more in the upper 16 bits and time information of 1 second or less in the lower 16 bits.

Thus, in the MMT package table (MPT), an MPU time stamp that is playback time information (time stamp) in units of MPU is recorded as an asset descriptor (asset_descriptors_byte).

The transmitter 20 shown in FIG. 1 records reproduction time information in units of MPU (Media Presentation Unit), which is one data processing unit in the MMT format, in the MMT package table (MPT) as NTP time information, and information on a television or the like. It transmits to the processing apparatus 30.
The information processing apparatus 30 acquires this time information and records it in the playlist.

That is, when the data to be recorded as the clip AV stream file on the information recording medium (medium) is MMT format data, the information processing apparatus 30 acquires the playlist control file that is the reproduction control information file from the MMT package table (MPT). NTP time information is recorded.

As described above with reference to FIG. 18 (2), the information processing apparatus 30 uses the playlist file when the reproduction target data to be recorded as the clip AV stream file on the information recording medium (medium) is MMT format data. As the start time (IN_time) and end time (OUT_time) of the play item information (PlayItem ()), time information according to NTP (Network Time Protocol) is recorded.

Next, with reference to FIG. 22, a playlist mark (PlayListMark), which is another element recorded in the playlist file, will be described.
First, the mark will be described. The mark is, for example, data that can be recorded in a playlist file or a clip information file as chapter delimitation of image data stored in a clip AV stream file, scene change points, bookmarks, highlights, or characteristic scene time designation information. is there.
Mark recording on the playlist file and clip information file is performed by recording a time stamp indicating the mark time.

FIG. 22 is a diagram illustrating a data configuration (syntax) of a playlist mark (PlayListMark) that is an element of a playlist file.
The playlist mark number (number_of_PlayList_marks) 121 indicates the number of marks stored in the playlist mark (PlayListMark).
The mark type (mark_type) 122 is a field indicating a mark type. For example, information indicating which type of mark is each mark, such as a representative image position of a playlist, a chapter start position, a chapter end position, a scene change position, an edit position, or the like is recorded.

The mark time stamp (mark_time_stamp) 123 is a field for recording a time stamp indicating a point where a mark is set.
The elementary stream packet ID entry (entry_ES_PID) 124 is a field for recording an identifier of a packet in which a mark is set.
The duration 125 is a field for recording a time interval between adjacent marks, for example, a chapter length.

The recorded data of the playlist mark (PlayListMark) shown in FIG. 22 is also defined when conventional MPEG-2TS format data is recorded as a clip AV stream file, but the MMT format is used as a clip AV stream file. There is no special provision for cases where data is recorded.
Therefore, it is necessary to define the recording data of the play list mark (PlayListMark) when MMT format data is recorded as a clip AV stream file.

FIG. 23 shows the following data example.
(1) Conventional playlist mark information recording data (MPEG-2TS compatible playlist)
(2) New playlist mark information record data (MMT compatible playlist)

“(1) Conventional playlist mark information recording data (MPEG-2TS compatible playlist)” shown in FIG. 23 (1) is a playlist mark (PlayListMark) when the reproduction target data is MPEG-2TS format data. Recording data to be recorded is shown.

The mark time stamp (mark_time_stamp) is a field for recording a time stamp indicating a point where a mark is set. When the reproduction data is MPEG-2TS format data, a time stamp at the mark setting position is recorded here. This time stamp is recorded as 45 KHz clock data, which is a general clock used for recording and reproducing MPEG-2TS format data.

The elementary stream packet ID entry (entry_ES_PID) is a field for recording an identifier of a packet in which a mark is set. When the reproduction data is MPEG-2TS format data, the packet ID (PID) of the TS packet at the mark setting position is recorded here.

The duration is a field for recording a time interval between adjacent marks, for example, a chapter length. When the reproduction data is MPEG-2TS format data, the time interval between adjacent marks is recorded here as 45 KHz clock data which is a general clock used for recording and reproduction of MPEG-2TS format data.

“(2) New playlist mark information recording data (MMT compatible playlist)” shown in FIG. 23 indicates recording data recorded in a playlist mark (PlayListMark) when the reproduction target data is MMT format data. ing.

When the reproduction target data is MMT format data, the mark time stamp (mark_time_stamp) records the time stamp of the mark setting position as time information according to NTP (Network Time Protocol).
The time information according to NTP (network time protocol) is acquired from, for example, the MPT described above with reference to FIG. 18 and others, that is, the MMT package table (MPT: MMT Package Table) defined in the MMT format. .

An elementary stream packet ID entry (entry_ES_PID) is a field for recording an identifier of a packet in which a mark is set. When the reproduction data is MMT format data, the packet ID of the MMT packet is set as a packet ID at the mark setting position. Record the ID.

The duration is a field for recording a time interval between adjacent marks, for example, a chapter length. In this field, even when the reproduction data is MMT format data, it is recorded as 45 KHz clock data as in the MPEG-2TS format data. The time interval between marks can be calculated at the time of data recording, and is set to be recorded in accordance with the data recording format of the conventional MPEG-2TS format data.

[6. Clip information file compatible with MMT format data]
Next, a clip information file corresponding to MMT format data will be described with reference to FIG.

As described above, in the clip information file, information on data to be reproduced by applying the clip information file is recorded. Specifically, for example, it has playback position information of a clip AV stream file.

FIG. 24 is a diagram illustrating a data configuration (syntax) of one clip information file.
In the clip information file, information related to reproduction data associated with the clip information is recorded. As shown in FIG. 24, for example, the following information is recorded.
Clip information [ClipInfo ()] 201,
Sequence information [SequenceInfo ()] 202,
Program information [ProgramInfo ()] 203,
CPI information [CPI ()] 204

Clip information [ClipInfo ()] 201 records attribute information of the AV stream file corresponding to the clip information file.
Sequence information [SequenceInfo ()] 202 records information related to the playback sequence of the playback target data stored in the AV stream file corresponding to the clip information file.

Program information [ProgramInfo ()] 203 records information related to a program (program) including definition information of a playback section and a time section of a clip AV stream played back by a clip information file.

The CPI information [CPI ()] 204 is, for example, data for acquiring the data address of the playback start point, and EP_map and TU_map described above with reference to FIGS. 13 to 15 are recorded.
As described above with reference to FIG. 12, the CPI type (CPI_type) is recorded in the playlist file. The CPI type (CPI_type) is information indicating a CPI type in a clip information file referred to by a play item (PlayItem) defined in the playlist file.

[6-1. About clip information recorded in clip information file]
Next, the data configuration (syntax) of clip information [ClipInfo ()] 201 recorded in the clip information file will be described with reference to FIG.
As described above, the clip information [ClipInfo ()] 201 is an area for recording attribute information of the AV stream file corresponding to the clip information file.

As shown in FIG. 25, the following data is recorded in the clip information [ClipInfo ()] 201.
(A) Application type 211
(B) Clip stream type (Clip_stream_type) 212
(C) Transcode mode flag (transcode_mode_flag) 213
(D) TS average rate (TS_average_rate) 214,
(E) TS recording rate (TS_recording_rate) 215,
(F) Number of source packets (num_of_source_packets) 216

Application type (application type) 211 is information indicating the type of playback application based on this clip information file. Specifically, a normal image playback type, a slide show playback processing type, and the like are defined.

The clip stream type (Clip_stream_type) 212 is information indicating the type of data stored in a clip AV stream file that is data to be reproduced by this clip information file. The MPEG-2TS format data includes a stream type in which a black image is inserted between streams in addition to a normal MPEG-2TS stream, and identification information of these types is recorded.

The transcode mode flag (transcode_mode_flag) 213 receives data stored in a clip AV stream file that is data to be reproduced by this clip information file, that is, data to be reproduced recorded on an information recording medium (medium), such as broadcast reception This is a flag indicating whether the data is recorded as it is or is recorded after being subjected to a conversion process such as a predetermined compression process.
In particular,
Flag value = 0: No conversion at the time of recording (transparent)
Flag value = 1: Conversion at the time of recording (transcoded)
Such a setting flag is recorded.

TS average rate (TS_average_rate) 214,
TS recording rate (TS_recording_rate) 215,
These are the average bit rate and recording rate of the transport stream of the clip AV stream file, which is the data to be played back by this clip information file, in units of bytes / seconds.

The number of source packets (num_of_source_packets) 216 is file size information of a clip AV stream file that is data to be reproduced by this clip information file. In the case of MPEG-2TS format data, the number of source packets is recorded.

As described above, the clip data [ClipInfo ()] 201 shown in FIG. 25 defines the following data as data to be recorded.
(A) Application type 211
(B) Clip stream type (Clip_stream_type) 212
(C) Transcode mode flag (transcode_mode_flag) 213
(D) TS average rate (TS_average_rate) 214,
(E) TS recording rate (TS_recording_rate) 215,
(F) Number of source packets (num_of_source_packets) 216

However, these data are defined assuming that the data stored in the clip AV stream file, which is the reproduction target data by the clip information file, is MPEG-2TS format data, and are stored in the clip AV stream file. It is not assumed that the processed data is MMT format data.
Therefore, it is necessary to define the data recording mode when the data stored in the clip AV stream file is MMT format data.

FIG. 26 shows the application type (Application type) 211 recorded in the clip information [ClipInfo ()] shown in FIG.
(1) Conventional clip information (ClipInfo) recording data (MPEG-2TS compatible clip information file)
(2) New clip information (ClipInfo) recording data (MPEG-2TS / MMT compatible clip information file)
It is the figure which showed these each data.

“(1) Conventional clip information (ClipInfo) recording data (MPEG-2TS compatible clip information file)” shown in FIG. 26 (1) is clip information (ClipInfo) when the reproduction target data is MPEG-2TS format data. The correspondence data of the set value and meaning of the application type (Application type) recorded in the table.

When the reproduction target data is MPEG-2TS format data, the following settings are made.
When the application type (Application type) = 1, the playback application type by this clip information file is “Main TS for a main-path of Movies”, that is, playback of the main TS (transport stream) corresponding to the image main path. Indicates an application.
Note that a plurality of playback paths such as a main path and a sub path can be set for the image playback path, and playback can be performed using different play items.

When the application type (Application type) = 2, the playback application type of this clip information file is “Main TS for a main-path of Time based slide show”, that is, the main path corresponding to the main path of the time-based slide show. Indicates a TS playback application.
As described above, conventionally, the reproduction target data is only the MPEG-2TS format data, and the setting shown in FIG. 26 (1) is used.

In “(2) New clip information (ClipInfo) recording data (MPEG-2TS / MMT compatible clip information file)” shown in FIG. 26 (2), the reproduction target data is MPEG-2TS format data or MMT format data. The corresponding value of the setting value and meaning of the application type (Application type) recorded in the clip information (ClipInfo) when two different format data are assumed.

In this setting, in addition to the application type (Application type) = 1, 2 described in FIG. 26 (1), the following setting is added.
Application type = 3

When the application type (Application type) is 3, the playback application type of this clip information file is “Main TLV / MMT for a main-path of Movies”, that is, the MMT stored in the TLV packet corresponding to the image main path. Indicates that this is a format data playback application.

By adding such a setting, the playback device stores the data stored in the clip AV stream file recorded on the information recording medium (media) in the TLV packet based on the recording data of the clip information file. It can be confirmed that the data is MMT format data, and a reproduction process corresponding to the MMT format data can be executed.

Next, with reference to FIG. 27, the clip stream type (Clip_stream_type) 212 recorded in the clip information [ClipInfo ()] shown in FIG.
(1) Conventional clip information (ClipInfo) recording data (MPEG-2TS compatible clip information file)
(2) New clip information (ClipInfo) recording data (MPEG-2TS / MMT compatible clip information file)
Each of these data will be described.

“(1) Conventional clip information (ClipInfo) recording data (MPEG-2TS compatible clip information file)” shown in FIG. 27 (1) is clip information (ClipInfo) when the reproduction target data is MPEG-2TS format data. The corresponding data of the set value and meaning of the clip stream type (Clip_stream_type) recorded in FIG.

When the reproduction target data is MPEG-2TS format data, the following settings are made.
When the clip stream type (Clip_stream_type) = 1, the type of data stored in the clip AV stream file that is the reproduction target data by this clip information file is “A Clip AV stream of BDAV MPEG-2TS”, that is, BDAV MPEG. -2 indicates that the clip AV stream is in TS format.

When the clip stream type (Clip_stream_type) = 2, the reproduction data type of this clip information file is “A Bridge-Clip AV stream of BDAV MPEG-2TS”, that is, a bridge type clip in the BDAV MPEG-2TS format. Indicates an AV stream.
The bridge type clip AV stream is a stream in which a black image is inserted between the streams.

Thus, conventionally, the reproduction target data is only the MPEG-2TS format data, and the setting shown in FIG. 27 (1) has been used.

In “(2) New clip information (ClipInfo) recording data (MPEG-2TS / MMT compatible clip information file)” shown in FIG. 27 (2), the reproduction target data is MPEG-2TS format data or MMT format data. The corresponding values of the set value and meaning of the clip stream type (Clip_stream_type) recorded in the clip information (ClipInfo) when two different format data are assumed are shown.

In this setting, the following setting is added in addition to the clip stream type (Clip_stream_type) = 1, 2 described in FIG.
Clip stream type (Clip_stream_type) = 3

When the clip stream type (Clip_stream_type) = 3, the data type stored in the clip AV stream file that is the reproduction target data by this clip information file is “A Clip AV stream of BDAV TLV / MMT”, that is, the BDAV format. The clip AV stream in the MMT format stored in the TLV packet recorded according to the above.

By adding such a setting, the playback device stores the clip AV stream file recorded on the information recording medium (medium) in the TLV packet recorded according to the BDAV format based on the recording data of the clip information file. Thus, it is possible to confirm that the data is the MMT format data, and to execute a reproduction process corresponding to the MMT format data.

Up to this point, as an example of changing the data to be recorded in the clip information [ClipInfo ()] 201 shown in FIG.
(A) Application type 211
(B) Clip stream type (Clip_stream_type) 212
These two data have been described.

Next, a data recording example corresponding to MMT format data will be described for the following data to be recorded in the clip information [ClipInfo ()] 201 shown in FIG.
(C) Transcode mode flag (transcode_mode_flag) 213
(D) TS average rate (TS_average_rate) 214,
(E) TS recording rate (TS_recording_rate) 215,
(F) Number of source packets (num_of_source_packets) 216

As described above, the transcode mode flag (transcode_mode_flag) 213 indicates that the clip AV stream file storage data, which is data to be reproduced by this clip information file, is recorded as it is received data such as broadcasts, or is a predetermined value. It is a flag indicating whether the data is recorded after being subjected to conversion processing such as compression processing.
In particular,
Flag value = 0: No conversion at the time of recording (transparent)
Flag value = 1: Conversion at the time of recording (transcoded)
Such a setting flag is recorded.
This setting can be used with the same setting for the MMT format data.

TS average rate (TS_average_rate) 214,
TS recording rate (TS_recording_rate) 215,
As described above, these represent the average bit rate and recording rate of the transport stream of the clip AV stream file, which is the data to be reproduced by this clip information file, in units of bytes / seconds.

This bit rate information is premised on calculation based on the TS packet. When the reproduction target data is MMT format data stored in the TLV packet, it is necessary to record the bit rate corresponding to the TLV packet.

That is, as shown in FIG.
In the field of TS average rate (TS_average_rate) 214,
Record the TLV average rate (TLV_average_rate).

The TLV average rate (TLV_average_rate) is calculated by the following calculation formula.
TLV average rate (TLV_average_rate)
= (File size) / ((ATS of TLV packet at the end of file) − (ATS of TLV packet at the beginning of file))
Note that the file in the above calculation formula is a clip AV stream file composed of TLV packets.
The ATS is a time stamp (ATS) indicating the start timing of processing (decoding or the like) of data stored in the TLV packet, and can be acquired from the TLV packet or control information (SI).

The calculated value calculated by the above formula is
As the TLV average rate (TLV_average_rate),
In the clip information [ClipInfo ()] shown in FIG.
Recorded in the field of TS average rate (TS_average_rate) 214.
Alternatively, when the reproduction target data is in the MMT format, an invalid value may be recorded in this field, and the average rate information may not be used.

Furthermore, as shown in FIG.
In the field of TS recording rate (TS_recording_rate) 215,
Record the TLV recording rate (TLV_recording_rate).

The TLV recording rate (TLV_recording_rate) is calculated by the following calculation formula.
TLV recording rate (TLV_recording_rate)
= (T2-t1) / S
Each parameter in the above formula is the following value.
t2: ATS of the maximum size TLV packet in the file
t1: ATS of the TLV packet next to the maximum size TLV packet in the file
S: Size of the maximum size TLV packet in the file Note that a file is a clip AV stream file composed of TLV packets.
The ATS is a time stamp (ATS) indicating the start timing of processing (decoding or the like) of data stored in the TLV packet, and can be acquired from the TLV packet or control information (SI).

The calculated value calculated by the above formula is
As a TLV recording rate (TLV_recording_rate),
In the clip information [ClipInfo ()] shown in FIG.
Recording is performed in the field of TS recording rate (TS_recording_rate) 215.
Alternatively, when the reproduction target data is in the MMT format, an invalid value may be recorded in this field, and the recording rate information may not be used.

Furthermore, in the clip information [ClipInfo ()] shown in FIG.
The number of source packets (num_of_source_packets) 216 is file size information of a clip AV stream file that is data to be reproduced by this clip information file.
As described above, when the reproduction target data is MPEG-2TS format data, the number of source packets is recorded.

As described above with reference to FIG. 6, the TS packet has a fixed length unlike the MMTP packet described above, and the packet size of one TS packet is fixed to 188 bytes.
Therefore, the data size can be grasped based on the number of packets.

However, when the reproduction target data is MMT format data, as described above with reference to FIG. 7, the MMTP packet that constitutes the configuration packet of the MMT format data and the TLV packet have a variable length, and various packets The size can be set.
Therefore, even if the number of packets is recorded in the field of the number of source packets (num_of_source_packets) 216, the data size cannot be grasped.

When the reproduction target data is in the MMT format, the file size (byte size) of the clip AV stream file composed of a plurality of TLV packets is recorded in this field.
When the reproduction target data is in the MMT format, this field records 64 bit data as a setting capable of recording 64-bit data, and records the file size (byte size) of a clip AV stream file composed of TLV packets as 64-bit data.
Alternatively, when the reproduction target data is in the MMT format, an invalid value may be recorded in this field to make it an unused field.

[6-2. Sequence information recorded in clip information file]
Next, the data structure (syntax) of sequence information [SequenceInfo ()] 202 recorded in the clip information file described above with reference to FIG. 24 will be described with reference to FIG.
As described above, the sequence information [SequenceInfo ()] 202 records information related to the playback sequence of the playback target data stored in the AV stream file corresponding to the clip information file.

As shown in FIG. 28, the following data is recorded in the sequence information [SequenceInfo ()] 202.
(A) ATC start position SPN (SPN_ATC_start) 221
(B) Number of STC sequences (num_of_STC_sequence) 222
(C) Program clock reference packet ID (PCR_PID) 223
(D) STC start position SPN (SPN_STC_start) 224,
(E) Display start time (presentation_start_time) 225,
(F) Display end time (presentation_end_time) 226

Prior to the description of these data, the packet configuration of a clip AV stream file storing playback target data and an example of playback processing will be described with reference to FIG.
FIG. 29 shows (a) a packet sequence stored in a clip AV stream file. In the case of MPEG-2 TS format data, one rectangle corresponds to one TS packet.
In the example of FIG. 29, packet numbers 0 to nn are the configuration data of one clip AV stream file.

The packet of this one clip AV stream file is a packet sequence arranged according to one ATC (arrival time clock).
A packet sequence arranged according to one ATC is called an ATC sequence.

One clip information file packet 0 to nn shown in FIG. 29 includes one or more STC sequences. In the example shown in FIG. 29, three STC sequences are included. STC sequences # 0 to # 2.
One STC (system time clock) is a clock defined based on one PCR (program clock reference), and source packets belonging to one STC sequence are reproduced and controlled by one STC (for example, 45 KHz). The

The STC sequence # 0 shown in FIG. 29 is a packet sequence that can be continuously reproduced in accordance with an STC (system time clock) that is a clock defined based on the PCR (program clock reference) stored in the PCR storage packet a.
The STC sequence # 1 is a PCR stored in the PCR storage packet b.
The STC sequence # 2 is a packet sequence that can continuously reproduce the PCR stored in the PCR storage packet c according to the STC defined as a reference.

Note that although the example shown in FIG. 29 has been described as an example in which three STC sequences are included in one ATC sequence, the number of STC sequences included in one ATC sequence can be variously set.

Returning to FIG. 28, the recording data of the sequence information [SequenceInfo ()] 202 recorded in the clip information file will be described.
(A) The ATC start position SPN (SPN_ATC_start) 221 is an area for recording the SPN (source packet number) of the ATC start position of the clip AV stream file to be reproduced by this clip information file.
In the example described with reference to FIG.
The ATC start position SPN (SPN_ATC_start) = 0.

(B) The number of STC sequences (num_of_STC_sequence) 222 records the number of STC sequences included in the clip AV stream file to be reproduced by this clip information file.
In the example described with reference to FIG.
The number of STC sequences (num_of_STC_sequence) = 3.

(C) The program clock reference packet ID (PCR_PID) 223 contains a packet storing a PCR (program clock reference) corresponding to each STC sequence included in the clip AV stream file to be reproduced by this clip information file. Record the packet identifier.

(D) In the STC start position SPN (SPN_STC_start) 224, the SPN (source packet number) of the start position of each STC sequence included in the clip AV stream file to be reproduced by this clip information file is recorded.

(E) Display start time (presentation_start_time) 225,
(F) Display end time (presentation_end_time) 226
In these, the display start time and end time of each STC sequence included in the clip AV stream file to be played back by the clip information file are recorded. As this time information, both STC time information (stc_id) and ATC time information (atc_id) are recorded.

The above description is an example of recorded data when the reproduction target data by the clip information file is MPEG-2TS format data.
Next, each recording data when the reproduction target data by the clip information file is MMT format data will be described.

(A) The ATC start position SPN (SPN_ATC_start) 221 is an area for recording the SPN (source packet number) of the ATC start position of the clip AV stream file to be reproduced by the clip information file, as described above.

However, when the reproduction target data is MMT format data, as described above with reference to FIG. 7, the MMTP packet and the TLV packet that constitute the MMT format data have a variable length and have various packet sizes. Can be set.
Therefore, even if the packet number is recorded in the field of the ATC start position SPN (SPN_ATC_start) 221, the data size cannot be grasped.

For these reasons, regarding the MMT format data compatible clip information file set when the reproduction target data is MMT format data stored by the TLV packet, the following recording areas of the sequence information [SequenceInfo ()] shown in FIG. Therefore, it is necessary to change and record the data corresponding to the MMT format data.
(A) ATC start position SPN (SPN_ATC_start) 221
(B) Number of STC sequences (num_of_STC_sequence) 222
(C) Program clock reference packet ID (PCR_PID) 223
(D) STC start position SPN (SPN_STC_start) 224,
(E) Display start time (presentation_start_time) 225,
(F) Display end time (presentation_end_time) 226

Referring to FIG. 30, the recording data of sequence information [SequenceInfo ()] when the reproduction target data is MMT format data stored by a TLV packet will be described.

First, (a) data recorded in the ATC start position SPN (SPN_ATC_start) 221 will be described.
As described above, the ATC start position SPN (SPN_ATC_start) 221 is an area for recording the SPN (source packet number) of the ATC start position of the clip AV stream file to be reproduced by this clip information file.
In the configuration example of the MPEG2-TS packet described with reference to FIG.
The ATC start position SPN (SPN_ATC_start) = 0.

In the case of a clip AV stream file composed of MPEG2-TS packets, as described with reference to FIG. 29, a packet sequence arranged according to one ATC (arrival time clock) is an ATC sequence. The SPN (source packet number) in the start position is recorded.

On the other hand, when the clip AV stream file is composed of a TLV packet sequence storing MMT format data,
The ATC sequence is one of the following sequences.
(1) Either a time stamp (timestamp) associated with an MMTP packet, a packet sequence number (packet_sequence_number), or a sequence (TLV packet sequence) defined by a combination of both of these data, or
(2) A sequence (TLV packet sequence) defined by an NTP transmission timestamp (transmit_timestamp),

When a clip AV stream file is composed of a TLV packet sequence storing MMT format data, one of the sequences (1) and (2) (TLV packet sequence) is defined as an ATC sequence.

Note that the NTP in (2) is time information according to a network time protocol as described above with reference to FIG.
A transmitting apparatus such as a broadcasting station stores NTP data in which transmission time stamps (transmit_timestamp) are stored at regular intervals (33.04647 msec intervals) in a TLV packet in which reproduction data and the like are stored, and further in a TLV packet. Store in and send.
This NTP time information transmission is mainly used for time adjustment of the receiving side apparatus.

As described above, the ATC sequence in the clip AV stream file constituted by the TLV packet sequence storing the MMT format data is defined as one of the sequences (1) and (2) (TLV packet sequence).
In accordance with the definition of this ATC sequence, data recorded at the ATC start position SPN (SPN_ATC_start) 221 of the sequence information (SequenceInfo ()) shown in FIG. 30 is the following recording data.
From the beginning of the clip AV stream file composed of TLV packet sequences (= the beginning of the first TLV packet stored in the file), the start position (= valid stream) of either (1) or (2) above The number of bytes up to (start position) is recorded data. For example, the number of bytes is recorded with 64 bits.

(B) STC sequence number (num_of_STC_sequence) 222 is an area for recording the number of STC sequences included in a clip AV stream file to be reproduced by this clip information file.
When the playback target data is MMT format data,
The number of STC sequences (num_of_STC_sequence) = 1.
In other words, only one STC sequence is included in one ATC sequence.

(C) The program clock reference packet ID (PCR_PID) 223 is a packet packet storing a PCR (program clock reference) corresponding to each STC sequence included in the clip AV stream file to be reproduced by this clip information file. This is an area for recording an identifier.
When the reproduction target data is MMT format data, the data position cannot be specified from the packet identifier. Therefore, an invalid value is recorded in this field, and the setting is not used.

(D) The STC start position SPN (SPN_STC_start) 224 is an area for recording the SPN (source packet number) at the start position of each STC sequence included in the clip AV stream file to be reproduced by this clip information file.

In the case of a clip AV stream file composed of MPEG2-TS packets, as described with reference to FIG. 29, a packet sequence arranged according to one STC (system time clock) is an STC sequence. The SPN (source packet number) in the start position is recorded.
One STC (system time clock) is a clock defined based on one PCR (program clock reference), and source packets belonging to one STC sequence are reproduced by one STC (for example, 45 KHz). Be controlled.

On the other hand, when the clip AV stream file is composed of a TLV packet sequence storing MMT format data,
The STC sequence is the following sequence.
(1) MPU presentation time (mpu_presentation_time) indicating an MPU-compatible reproduction (presentation) time, which is one data processing unit of reproduction target data such as images, sounds, and captions in the MMT format, or an MPU-compatible sequence identifier MPU A sequence defined by one or both of the corresponding sequence numbers (mpu_sequence_number).

When the clip AV stream file is composed of a TLV packet sequence storing MMT format data, the STC sequence is the sequence shown in (1) above.

Note that the MPU presentation time (mpu_presentation_time), the MPU corresponding sequence number (mpu_sequence_number), and these data are data recorded in the MPU time stamp descriptor described above with reference to FIG.
The MPU time stamp descriptor is recording data in the MMT package table (MPT) described above with reference to FIG.

When using the STC sequence defined in (1) above, the setting of the MPU presentation time leap identifier (mpu_presentation_time_leap_indicator), which is an identifier indicating whether or not “leap second” is included in the MPU presentation time (mpu_presentation_time), is considered. It is also necessary to do.
The MPU presentation time leap identifier (mpu_presentation_time_leap_indicator) is set to [1] when “leap second” is included in the MPU presentation time (mpu_presentation_time), and [0] otherwise.

As described above, when the data stored in the clip AV stream file is MMT format data, either the MPU presentation time (mpu_presentation_time) or the MPU-compatible sequence number (mpu_sequence_number) that is an MPU-compatible sequence identifier, or The sequence defined by both is used as the STC sequence.

When the reproduction target data is MMT format data, it is shown in FIG.
(D) In the field of the STC start position SPN (SPN_STC_start) 224, the head of the clip AV stream file (= the first TLV stored in the file) is the same as (a) the ATC start position SPN (SPN_ATC_start) 221 described above. The number of bytes from the top of the packet) to the start position of the STC sequence according to the above definition is recorded. For example, the number of bytes is recorded with 64 bits.

(E) Display start time (presentation_start_time) 225,
(F) Display end time (presentation_end_time) 226
These are areas for recording the display start time and end time of each STC sequence included in the clip AV stream file to be played back by this clip information file.

When the playback target data is MMT format data,
(E) In the data recording area of the display start time (presentation_start_time) 225,
Record the MPU presentation time (mpu_presentation_time) recorded in the first MPT (MMT package table) in the TLV packet in one STC sequence starting from “(d) STC start position SPN (SPN_STC_start)” described above. To do.

The MPU presentation time (mpu_presentation_time) is data recorded in the MPU time stamp descriptor described above with reference to FIG.
The MPU time stamp descriptor is recording data in the MMT package table (MPT) described above with reference to FIG.

The MPU presentation time (mpu_presentation_time) time information recorded in the MPT (MMT package table) is 64-bit time information according to NTP (Network Time Protocol), and this 64-bit NTP time information is expressed as “(e)”. It is recorded in the “data recording area of display start time (presentation_start_time) 225”.

Furthermore, when the reproduction target data is MMT format data,
(F) In the data recording area of the display end time (presentation_end_time) 226,
Record the MPU presentation time (mpu_presentation_time) recorded in the last MPT (MMT package table) in the TLV packet in one STC sequence starting from “(d) STC start position SPN (SPN_STC_start)” described above. To do.
(E) Similar to the data of the display start time (presentation_start_time) 225, 64-bit NTP time information is recorded.

[6-3. Program information recorded in clip information file]
Next, the data structure (syntax) of the program information [ProgramInfo ()] 203 recorded in the clip information file described above with reference to FIG. 24 will be described with reference to FIG.
As described above, the program information [ProgramInfo ()] 203 records information related to a program (program) including definition information of a playback section and a time section of a clip AV stream played back by a clip information file.

The main data recorded in the program information [ProgramInfo ()] shown in FIG. 31 will be described.
(A) In the number of program sequences [num_of_program_sequences] 231, the number of program sequences (program_sequence) included in the clip information file is recorded.
(B) The SPN program sequence start address [SPN_program_sequence_start [i]] 232 records the relative address of the place where the program sequence starts on the AV stream file.
(C) In the program map PID [program_map_PID [i]] 233, the storage location information of the map of the program sequence (program_sequence) is recorded.
(D) In the stream PID [Stream_PID] 234, the packet identifier (PID) of the TS packet that transmits the stream is recorded.
(E) Stream coding information [StreamCodingInfo] 235 records coding (encoding) information of a stream to be played.

The program sequence is a section in which encoded information in the AV stream included in the clip AV stream file is continuous.
For example, an image data section encoded in one image encoding mode, an audio data section encoded in one audio encoding mode, and the like are respectively defined as individual program sequences.

These recorded data of the program information [ProgramInfo ()] shown in FIG. 31, that is,
(A) Number of program sequences [num_of_program_sequences] 231,
(B) SPN program sequence start address [SPN_program_sequence_start [i]] 232,
(C) Program map PID [program_map_PID [i]] 233,
(D) Stream PID [Stream_PID] 234,
These data recording modes are defined when the reproduction target data by the clip information file is in the MPEG-2TS format, but there is no definition when the reproduction target data is the MMT format data. It is necessary to do.

(A) The number of program sequences [num_of_program_sequences] 231 is
The number of program sequences may be recorded regardless of whether the reproduction target data is the MPEG-2TS format or the MMT format.

(B) For the SPN program sequence start address [SPN_program_sequence_start [i]] 232, if the reproduction target data is in the MPEG-2TS format, the SPN (source packet number) at the start position of the SPN program sequence is recorded.

On the other hand, when the clip AV stream file storing the reproduction target data is composed of a TLV packet sequence storing MMT format data, the beginning of the clip AV stream file (= the beginning of the first TLV packet stored in the file) To the number of bytes from the start of each program sequence. For example, the number of bytes is recorded with 64 bits.

(C) For the program map PID [program_map_PID [i]] 233, when the reproduction target data is in the MPEG-2TS format, the identifier (PID) of the packet storing the map of the program sequence (program_sequence) is recorded. .
The program map is map data in which information such as an image, audio, subtitles, and the like such as an encoding mode of each program sequence unit is recorded.

On the other hand, when the clip AV stream file storing the reproduction target data is MMT format data, the information corresponding to the map data in which the information such as the coding mode of each program sequence unit, such as the image, the sound, the caption, is recorded as Are recorded in the MMT package table (MPT: MMT Package Table) described with reference to FIG.

As described above with reference to FIG. 19, the MMT package table (MPT: MMT Package Table) has data attribute information (asset description) for each data type (asset type) such as image, audio, subtitle, etc. There is a table that records (child) in detail. In the MMT format, one asset corresponds to one program sequence.

When decoding and reproducing data such as images, audio, and subtitles in accordance with the MMT format stored in the clip AV stream file, each asset unit such as an image, audio, and subtitles is referred to with reference to this MMT package table (MPT). It is possible to acquire attribute information such as an encoding mode.

Therefore, when the clip AV stream file storing the reproduction target data is MMT format data, the packet storing the MMT package table (MPT) is recorded in the recording area of the program map PID [program_map_PID [i]] 233 shown in FIG. PID (packet identifier) may be recorded.
Note that the PID (packet identifier) applied to the identification is basically the PID of the MMTP packet, but the PID of the upper IP packet or TLV packet can also be used.

However, the problem here is that the packet storing the target MMT package table (MPT) may not be identified by the PID (packet identifier).
The reason for this will be described with reference to FIG. 32 and FIG.

First, with reference to FIG. 32, description will be given of a packet distribution example in which a packet storing a target MMT package table (MPT) can be specified by a PID (packet identifier).
FIG. 32 shows the following figures.
(1) Transmission packet of broadcast server 21 (2) PID (packet identifier) setting example for transmission packet of broadcast server 21

The transmission packet of the broadcast server 21 shown in FIG. 32 (1) indicates a packet sequence of a TLV packet. The TLV packet is configured by a packet storing various data such as reproduction target data such as images, sounds, and captions, and control information (SI).
It is assumed that the broadcast server 21 transmits a plurality of program contents corresponding to a plurality of channels, such as a BS 101 channel and a BS 102 channel, and control information.

The following packet sequence is shown in the PID (packet identifier) setting example for the transmission packet of the broadcast server 21 shown in FIG.
(A) Broadcast server compatible control information (SI)
(B) Data corresponding to channel 101 (reproduction data (image, sound, subtitles, etc.) + Control information corresponding to channel 101 (SI))
(C) Channel 102 compatible data (reproduction data (image, audio, caption, etc.) + Channel 102 compatible control information (SI))

The broadcast server 21, for example, mixes the above-mentioned (A), (B), (C), and these three series packets and transmits them as one IP data flow.
Each packet identifier (PID) of a plurality of packets included in one IP data flow is set so as not to overlap.

(A) The broadcast server compatible control information (SI) is a TLV packet sequence composed of a program table of a plurality of channel program contents transmitted by the broadcast server 21 and control information necessary for receiving processing of the contents of each channel. It is.
(B) Channel 101 compatible data (reproduction data (image, audio, subtitles, etc.) + Channel 101 compatible control information (SI)) is used for the reproduction data of the program content of channel 101 and the reproduction processing of the program content of this channel. This is a TLV packet sequence composed of data unique to the channel 101 such as necessary control information.
(C) Channel 102 compatible data (reproduction data (image, audio, subtitles, etc.) + Channel 102 compatible control information (SI)) is used for reproduction data of channel 102 program content, reproduction processing of program content of this channel, and the like. It is a TLV packet sequence composed of data specific to the channel 102 such as necessary control information.

As shown in FIG. 32, (B) channel 101 compatible data (reproduction data (image, audio, subtitle, etc.) + Channel 101 compatible control information (SI)) includes control necessary for reproduction of the program content of channel 101. A TLV packet storing an MPT-101 storage packet that is a packet storing an MMT package table (MPT) corresponding to the channel 101 storing information is included.

Further, as shown in FIG. 32, (C) channel 102 compatible data (reproduction data (image, audio, subtitles, etc.) + Channel 102 compatible control information (SI)) is necessary for reproducing the program content of channel 102. A TLV packet storing an MPT-102 storing packet, which is a packet storing an MMT package table (MPT) corresponding to the channel 102 storing the control information is included.

The example shown in FIG. 32 is an example in which the broadcast server 21 transmits the three data series (A), (B), and (C) shown in FIG. 32 (2) as one IP data flow. In this case, a unique PID (packet identifier) is set for each of all packets included in the three data series (A), (B), and (C) shown in FIG.
In this way, if a unique PID is set for all TLV packets included in the three data series (A), (B), and (C) shown in FIG. By (packet identifier), all TLV packets included in the three data series (A), (B), and (C) can be identified based on PID (packet identification).

As a result, the MPT-101 stored packet storing the MMT package table (MPT) corresponding to the channel 101 and the MPT-102 stored packet storing the MMT package table (MPT) corresponding to the channel 102 are also stored in the PID (packet identifier). It becomes possible to identify based on.

Next, a packet distribution example in which it is impossible to specify a packet storing a target MMT package table (MPT) by PID (packet identifier) will be described with reference to FIG.
FIG. 33 shows the following figures as in FIG.
(1) Transmission packet of broadcast server 21 (2) PID (packet identifier) setting example for transmission packet of broadcast server 21

The transmission packet of the broadcast server 21 shown in FIG. 33 (1) indicates a packet sequence of a TLV packet. The TLV packet is configured by a packet storing various data such as reproduction target data such as images, sounds, and captions, and control information (SI).
It is assumed that the broadcast server 21 transmits a plurality of program contents corresponding to a plurality of channels such as a CS301 channel and a CS302 channel, and control information.

The PID (packet identifier) setting example for the transmission packet of the broadcast server 21 shown in FIG. 33 (2) shows the following packet sequence as in FIG.
(A) Broadcast server compatible control information (SI)
(B) Data corresponding to channel 301 (reproduction data (image, sound, caption, etc.) + Control information corresponding to channel 301 (SI))
(C) Data corresponding to channel 302 (reproduction data (image, sound, caption, etc.) + Control information corresponding to channel 302 (SI))

The broadcast server 21 transmits, for example, the above-mentioned (A), (B), (C), and these three series packets mixedly.
However, in the example shown in FIG. 33, the broadcast server 21 transmits (A), (B), (C), and these three sequences as three separate IP data flows.
As described above, each packet identifier (PID) of a plurality of packets included in one IP data flow is set so as not to overlap.

The packet distribution example shown in FIG. 33 differs from FIG. 32 in that the broadcast server 21 transmits each of the three data series (A), (B), and (C) shown in FIG. The broadcast server 21 sets and transmits a PID (packet identifier) for each IP data flow (= each data series (A), (B), (C)).
That is, a PID (packet identifier) that is not duplicated in the sequence (A) is set in the TLV packet included in the data sequence (A).
A PID (packet identifier) that is not duplicated in the sequence (B) is set in the TLV packet of the data sequence (B).
A PID (packet identifier) that is not duplicated in the sequence (C) is set in the TLV packet of the data sequence (C).
The example shown in FIG. 33 is an example in which PIDs (packet identifiers) with no duplication are set and transmitted in units of data series in this way.

However, in the example in which a plurality of IP data flows are set and a PID (packet identifier) is set and transmitted in units of each IP data flow, when the data series are different, the same PID (packet identifier) is set. May be set.
For example, the PID (packet identifier) of the MPT-301 stored packet storing the MMT package table (MPT) corresponding to the channel 301 included in the data sequence (B) is the same as the data sequence (A) or (C) There is a possibility that it is set in another packet.
Similarly, the PID (packet identifier) of the MPT-302 stored packet storing the MMT package table (MPT) corresponding to the channel 302 included in the data sequence (C) is the same PID (packet identifier) as the data sequence (A). Or (B) may be set for other packets.

That is, in the PID (packet identifier) setting example shown in FIG. 33, the receiving apparatus uses only the PID (packet identifier) to store the MPT-301 stored packet storing the MMT package table (MPT) corresponding to the channel 301, or the channel 302. It becomes impossible to identify and selectively extract the MPT-302 stored packet storing the corresponding MMT package table (MPT).

For example, Japanese broadcast regulations allow transmission processing to be performed with one IP data flow setting shown in FIG. 32 for BS broadcasting and with a plurality of IP data flow settings shown in FIG. 33 for CS broadcasting.

As shown in FIG. 33, even when overlapping PIDs (packet identifiers) are set between different IP data flows (data series), packet identification by PID (packet identifier) is possible for each data series unit. Control information is transmitted from a transmission device such as the broadcast server 21 to the reception device.

This control information is control information included in the broadcast server correspondence control information (SI) shown in FIGS. 32 (2) (A) and 33 (2) (A), and is a package list table (PLT: Package List Table). Called.
A package list table (PLT: Package List Table) will be described with reference to FIG.

FIG. 34 shows the following packet sequences.
(A) Broadcast server compatible control information (SI)
(B) Channel X compatible data (reproduction data (image, audio, subtitles, etc.) + Channel X compatible control information (SI))
(C) Channel Y compatible data (reproduction data (image, audio, caption, etc.) + Channel Y compatible control information (SI))
These correspond to the three data series (A), (B), and (C) described with reference to FIGS. 32 and 33.

(A) The broadcast server correspondence control information (SI) includes a package list table (PLT: Package List Table).
In the package list table (PLT), the packets (MPT-X, MPT-Y) stored in the MMT package table (MPT) corresponding to each channel included in the other data series ((B), (C)) are selectively extracted. MPT identification information for recording is recorded.

The receiving device refers to the MPT identification information recorded in the package list table (PLT), so that each data series, that is, a packet stored in the MMT package table (MPT) corresponding to each channel (MPT-X, MPT-Y) Can be selected and extracted.
Further, the MMT package table (MPT) corresponding to each channel records PIDs (packet identifiers) in units of assets (images, sounds, subtitles, etc.) of the channel, and the receiving device can receive the MMT package table (MPT). It is possible to read PID (packet identifier) in units of assets (image, audio, subtitles, etc.) recorded in, and individually select and extract packets storing the image, audio, subtitles of that channel.

FIG. 35 shows the data structure (syntax) of the package list table (PLT).
The MMT general position information (MMT_general_location_info) 241 shown in FIG. 35 is the MPT identification information described above.
That is, it is MPT identification information for selectively extracting the stored packets (MPT-X, MPT-Y) of the MMT package table (MPT) corresponding to each channel.

FIG. 36 is a diagram illustrating a data configuration (syntax) of MMT general position information (MMT_general_location_info) 241.
A packet identifier (packet_id) 242 shown in FIG. 36 is a PID (packet identifier) of the MMT package table (MPT) corresponding to each data series (each channel).
With reference to this packet identifier (packet_id) 242, the receiving apparatus can selectively extract packets stored in the MMT package table (MPT) corresponding to each channel (for example, MPT-X and MPT-Y in FIG. 34). Become.

FIG. 37 is a diagram showing the data structure (syntax) of the MMT package table (MPT).
The MMT general position information (MMT_general_location_info) 243 shown in FIG. 37 is identification information for each asset (image, audio, caption, etc.).
That is, it is information for identifying a packet storing an image, sound, and caption corresponding to a channel belonging to one channel.

FIG. 38 is a diagram illustrating a data configuration (syntax) of MMT general position information (MMT_general_location_info) 243 recorded in the MMT package table (MPT).
A packet identifier (packet_id) 244 shown in FIG. 38 is a PID (packet identifier) in units of assets (image, audio, caption, etc.) described above.
With reference to the packet identifier (packet_id) 242, the receiving apparatus can individually select and extract a packet storing an image, audio, and caption corresponding to one channel.

As described above, the receiving apparatus has been described with reference to FIGS.
(A) By referring to the package list table (PLT) included in the broadcast server compatible control information, the MMT package table (MPT) corresponding to each channel is identified and acquired, and the recorded data of the acquired MMT package table (MPT) Based on the above, it is possible to selectively extract packets storing reproduction data corresponding to each channel, such as images, sounds, and captions.

However, when the receiving apparatus records data on a medium such as a BD, for example, there may be a case where only the data corresponding to the channel to be recorded is selected and recorded.
That is, for example, the data series (B) and data series (C) described with reference to FIGS. 32 to 34, packets belonging to the data series including these reproduction target data (TLV packets) are selected and BD or the like is selected. May be recorded on media.
In this case, the (A) broadcast server correspondence control information is not a recording target for the medium.
When data is recorded on the media with such settings, the package list table (PLT) included in the (A) broadcast server compatible control information is not recorded on the media.
Therefore, when data is reproduced from the media, the PID (packet identifier) of the MMT package table (MPT) corresponding to each channel is read with reference to the package list table (PLT), and the MMT package table is read based on the read PID. The process of extracting the packet storing (MPT) becomes impossible.

Also, all data series (A) to (C) are set to be recorded on the medium, and all TLV packets of a plurality of data series transmitted from one broadcasting station are recorded in one clip AV stream file. Packets having the same packet identifier are mixed in one clip AV stream file, and in order to identify them, a packet storing a package list table (PLT) included in the clip AV stream file It is necessary to perform a process of extracting the PLT and referring to the PLT data. This process is not a process that can be realized by a reproduction process according to the current BDAV format, that is, a reproduction process based on control information recorded in a clip information file.

Accordingly, even when the clip AV stream file is MMT format data, it is necessary to change the recording information of the clip information file to be recorded in order to enable playback processing based on the control information recorded in the clip information file. .

[6-3-1. Example of processing for recording IP data flow identification information in program information of clip information file]
Hereinafter, a description will be given of the configuration of a clip information file that enables smooth playback processing according to the recording data of the clip information file when the clip AV stream file is MMT format data.

When the clip AV stream file storing the reproduction target data is MMT format data, the information processing apparatus that records data on a medium such as a BD has program information shown in FIG. 31 in the clip information file for recording the reproduction control information. The PID (packet identifier) of the packet storing the MMT package table (MPT) is recorded in the program map PID [program_map_PID [i]] 233 recording area of the [ProgramInfo ()] 203, and this MPT or MPT is used. IP data flow identification information that can identify “IP data flow (corresponding to data series (B), (C), etc. shown in FIGS. 32 to 34)” corresponding to the reproduction data to be reproduced is recorded.

A specific example will be described with reference to FIG.
FIG. 39 shows the data structure (syntax) of the program information [ProgramInfo ()] 203 recorded in the clip information file, as described with reference to FIG.
The data structure (syntax) of the program information [ProgramInfo ()] 203 shown in FIG. 39 is the program information [ProgramInfo ()] when the clip AV stream file reproduced by applying this clip information file is MMT format data. 203 data structure.

In the data configuration shown in FIG. 39, the data recording areas of the data 251 to 256 correspond to the recording area of the program map PID [program_map_PID [i]] 233 described with reference to FIG.
As described with reference to FIG. 31, the storage location information of the map of the program sequence (program_sequence) is recorded in the recording area of the program map PID [program_map_PID [i]] 233.

When the clip AV stream file reproduced by applying the clip information file is MMT format data, as shown in FIG. 39, the following data is stored in the recording area of the original program map PID [program_map_PID [i]] 233: Record.
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
(5) Next header information (next_header) 255
(6) MPT stored packet identifier (MPT_PID) 256

Among the data, the data sets (1) to (5) correspond to the IP data flow identification information.
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
These data are IP packet correspondence information corresponding to the IP packet stored in the TLV packet. (5) Next header information (next_header) 255 is a recording area for protocol type information, and records a fixed value [00010001] indicating UDP.

The data set composed of the five data (1) to (5) is information specific to the IP data flow. For example, when a plurality of IP data flows are mixedly transmitted from the same broadcast server, the data sets (1) to (5) are data sets having different settings for each IP data flow, and the IP data flow identification is performed. Data that can be used as information.
The information processing apparatus can determine the IP data flow by referring to the IP data flow identification information including these five data.

Furthermore, after the information processing apparatus identifies the IP data flow based on the IP data flow identification information of (1) to (5),
(6) MPT stored packet identifier (MPT_PID) 256
This data is read, a PID storing an MPT corresponding to a specific IP data flow (for example, a specific channel) is read, and a packet storing an MPT corresponding to the IP data flow (for example, a specific channel) is read based on the PID. It becomes possible to specify.

When the information processing apparatus records a clip AV stream file composed of a TLV packet sequence storing MMT format data on a medium such as a BD, the program information [ProgramInfo ()] program of the clip information file corresponding to the clip AV stream file The following data is recorded in the map PID [program_map_PID [i]] recording area.
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
(5) Next header information (next_header) 255
(6) MPT stored packet identifier (MPT_PID) 256

By recording these data in the clip information file, the playback device that plays back data from the media reads the data (1) to (6) from the clip information file, and one IP data flow and its IP data. It is possible to select a packet that stores a flow-compatible MPT.

Note that the IP data flow identification information constituted by the data (1) to (5) is recorded in the IP header of the IP packet stored in the TLV packet, and the recording device uses the data ( 1) to (5) are acquired, recorded in a clip information file, and recorded on a medium such as a BD.
Also, the playback device refers to the IP header of the IP packet in the TLV packet in the clip AV stream file, reads the corresponding data of the data (1) to (5), and records the packet (TLV packet) recorded on the medium. / IP packet / MMTP packet) can be identified.

As described above with reference to FIG. 10, a clip AV stream file including a packet sequence of TLV packets is recorded on a medium such as a BD. An IP packet is stored in each TLV packet, and an MMTP packet is stored in the IP packet.
Control information such as reproduction target data (image, audio, subtitle) and MMT package table (MPT) is stored as a payload of the MMTP packet.

Next, the data configuration (syntax) of the TLV header that is the header of the TLV packet and the IP header that is the header of the IP packet will be described with reference to FIG.
As shown in FIG. 40, the packet type (packet_type) is recorded in the TLV header set in the TLV packet.
According to the value of the packet type, the TLV packet can be identified as any of the following types (a) to (c).

Specifically, the settings are as follows.
Packet type (packet_type) = 0x02 means that the payload of the TLV packet is an “IP (V6) packet”.
Packet type (packet_type) = 0x03 means that the payload of the TLV packet is a “compressed IP packet”.
Packet type (packet_type) = 0xFE means a “TLV-SI packet”.

“Compressed IP packet” indicates that the IP header of the IP packet stored in the TLV packet is set as compressed data.
Specifically, it is an IP packet in which an IP header is set without data such as length data.
In “IP (V6) packet” and “TLV-SI packet”, the IP header of the IP packet stored in the TLV packet is set as uncompressed data including length data and the like.

FIG. 41 is a diagram illustrating a data example of an IP header of an IP packet stored in a TLV packet storing an uncompressed type IP packet.
Further, FIG. 42 shows a data ray of a packet data byte (packet_data_byte) in the IP header shown in FIG.

As shown in FIGS. 41 and 42, the IP header of the IP packet stored in the TLV packet includes the following five data sets that constitute the IP data flow identification information described with reference to FIG. Are recorded.
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
(5) Next header information (next_header) 255

An information processing apparatus that records received data from a transmission apparatus such as a broadcast server on a medium such as a BD reads, for example, the recording information of the IP header and stores an IP packet composed of the same IP header recording information. A clip AV stream file composed of packets can be generated and recorded on a medium.
Further, as described above with reference to FIG. 39, the IP of (1) to (5) above is recorded in the program map PID [program_map_PID [i]] recording area of the program information [ProgramInfo ()] of the clip information file. Record data flow identification information.

Furthermore, the PID (packet identifier) of the MPT storage packet recorded as the clip AV stream file is also recorded in the program map PID [program_map_PID [i]] recording area of the program information [ProgramInfo ()].
Note that the PID (packet identifier) of the MPT storage packet recorded as a clip AV stream file can be obtained from the package list table (PLT) transmitted from the transmission apparatus described above with reference to FIGS. . Alternatively, referring to the IP header information in the TLV packet of the clip AV stream file to be recorded on the media, the MPT storage packet matching the IP data flow identification information of the data series (channel) to be recorded on the media is extracted and extracted. The PID (packet identifier) of the packet may be recorded.

The example of the IP header of the IP packet described with reference to FIGS. 41 and 42 is a data configuration example of the IP header in the case of an uncompressed IP packet.
Next, an example of the data structure of the IP header in the case of a compressed IP packet will be described with reference to FIGS.

As shown in FIG. 43, the compressed IP header includes
Context identifier (CID),
IPv6 header information UDP header information is recorded.

As shown in FIG. 44, the IPv6 header information and the UDP header information include five data sets that constitute the IP data flow identification information described above with reference to FIG. 39, as in the IP header of the uncompressed IP packet. The following five pieces of data are recorded.
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
(5) Next header information (next_header) 255

An information processing apparatus that records received data from a transmission apparatus such as a broadcast server on a medium such as a BD reads, for example, the recording information of the IP header and stores an IP packet composed of the same IP header recording information. A clip AV stream file composed of packets can be generated and recorded on a medium.
Further, as described above with reference to FIG. 39, the IP of (1) to (5) above is recorded in the program map PID [program_map_PID [i]] recording area of the program information [ProgramInfo ()] of the clip information file. Record data flow identification information.
Further, the program map PID [program_map_PID [i] of the program information [ProgramInfo ()] is also obtained for the PID (packet identifier) of the MPT storage packet recorded as the clip AV stream file by the same process as the process of the previous uncompressed IP packet. ] Record in the recording area.

Further, when the packet sequence to be recorded in the clip AV stream file is a TLV packet sequence including a compressed IP packet, the above IP data flow identification information (1) to (5) is not recorded in the clip information file. Is also possible.
Instead of the above IP data flow identification information (1) to (5), it is the recording data of the IP header in the case of the compressed IP packet shown in FIG.
Context identifier (CID),
May be recorded in the clip information file.

The context identifier (CID) is set as an identifier unique to the IP data flow. Specifically, the five data mentioned above, ie,
(1) Source IP address (src_IP_address) 251
(2) Destination IP address (dest_IP_address) 252
(3) Destination port (destination_port) 253
(4) Source port (source_port) 254
(5) Next header information (next_header) 255
Different values depending on these data sets are set as the value of the context identifier (CID).

Therefore, the IP data flow can be identified based on the context identifier (CID).
Based on the context identifier (CID) set in the IP header of the IP packet which is a component of the packet (TLV packet / IP packet / MMTP packet) constituting the clip AV stream file, the IP data flow to which the packet belongs is determined. It becomes possible to do.
A packet in which the same CID is set in the IP header is a packet belonging to the same IP data flow.

As described above, when the packet sequence to be recorded in the clip AV stream file is a TLV packet sequence including a compressed IP packet, a context identifier is used instead of the IP data flow identification information of (1) to (5) above. (CID) may be recorded in the clip information file.

An example of the structure of this clip information file is shown in FIG.
FIG. 45 shows the data structure (syntax) of program information [ProgramInfo ()] 203 recorded in the clip information file shown in FIG. 24, as described above with reference to FIG.
The data structure (syntax) of the program information [ProgramInfo ()] 203 shown in FIG. 45 is MMT format data in which a clip AV stream file reproduced by applying this clip information file is stored in an IP packet having a compressed IP header. Is the data configuration of program information [ProgramInfo ()] 203.

In the data configuration shown in FIG. 45, the data recording area of the data 261 to 262 corresponds to the recording area of the program map PID [program_map_PID [i]] 233 described with reference to FIG.
When the clip AV stream file reproduced by applying the clip information file is MMT format data stored in the IP packet having the compressed IP header, as shown in FIG. 45, the original program map PID [program_map_PID [i] ] The following data is recorded in the recording area 233.
(1) Context identifier (CID) 261
(2) MPT stored packet identifier (MPT_PID) 262

In the above data, (1) context identifier (CID) 261 corresponds to IP data flow identification information.
The context identifier (CID) is information recorded in the compressed IP header of the IP packet stored in the TLV packet.
As described above, the context identifier (CID) is information unique to the IP data flow. For example, when a plurality of IP data flows are mixedly transmitted from the same broadcast server, (1) the context identifier (CID) has a different value for each IP data flow.
The information processing apparatus can determine the IP data flow by referring to the context identifier (CID).

In addition, (1) after identifying the IP data flow based on the context identifier (CID),
(2) MPT stored packet identifier (MPT_PID) 262
This data is read, a PID storing an MPT corresponding to a specific IP data flow (for example, a specific channel) is read, and a packet storing an MPT corresponding to the IP data flow (for example, a specific channel) is read based on the PID. It becomes possible to specify.

When the information processing apparatus records a clip AV stream file composed of a TLV packet sequence storing MMT format data on a medium such as a BD, the program information [ProgramInfo ()] program of the clip information file corresponding to the clip AV stream file The following data is recorded in the map PID [program_map_PID [i]] recording area.
(1) Context identifier (CID) 261
(2) MPT stored packet identifier (MPT_PID) 262

By recording these data in the clip information file, a playback apparatus that plays back data from the media reads the data (1) to (2) from the clip information file, and one IP data flow and its IP data. It is possible to select a packet that stores a flow-compatible MPT.

Note that (1) the context identifier (CID) 261 is recorded in the compressed IP header of the IP packet stored in the TLV packet, and the recording device obtains (1) the context identifier (CID) 261 from the compressed IP header. It is acquired, recorded in a clip information file, and recorded on a medium such as a BD.
Also, the playback device refers to the compressed IP header of the IP packet in the TLV packet in the clip AV stream file, reads the context identifier (CID), and records the packet (TLV packet / IP packet / MMTP packet) recorded on the medium. ) To which the IP data flow belongs.

[6-3-2. Example of processing for recording PLT information and MPT information in program information of clip information file]
Next, an example of processing for recording PLT information and MPT information in the program information [ProgramInfo ()] recording area of the clip information file will be described.

A configuration example of this clip information file is shown in FIG.
FIG. 46 shows the data structure (syntax) of program information [ProgramInfo ()] 203 recorded in the clip information file shown in FIG. 24, as described above with reference to FIGS. 39 and 45.
The data structure (syntax) of the program information [ProgramInfo ()] 203 shown in FIG. 46 is the program information [ProgramInfo ()] when the clip AV stream file reproduced by applying this clip information file is MMT format data. 203 data structure.

In the data configuration shown in FIG. 46, the data recording area of the data 265 to 266 corresponds to the recording area of the program map PID [program_map_PID [i]] 233 described with reference to FIG.
When the clip AV stream file reproduced by applying the clip information file is MMT format data, as shown in FIG. 46, the following data is stored in the recording area of the original program map PID [program_map_PID [i]] 233: Record.
(1) Program list table (PLT) information (PLTInfo) 265
(2) MMT package table (MPT) information (MPTInfo) 266

A specific example of the data (1) and (2) is shown in FIG.
FIG. 47 shows the following two data configuration examples.
(A1) Program list table (PLT) information (A2) MMT package table (MPT) information

As shown in FIG. 47, (A1) program list table (PLT) information is composed of the following data.
IP data flow identification information 271
Program list table (PLT) packet identification information (PLT_PID) 272

The IP data flow identification information 271 is composed of the following five data sets described above with reference to FIG.
(1) Source IP address (src_IP_address)
(2) Destination IP address (dest_IP_address)
(3) Destination port (destination_port)
(4) Source port (source_port)
(5) Next header information (next_header)

The IP data flow identification information 271 is IP data flow identification information corresponding to an IP data flow including a packet storing a program list table (PLT).
That is, it is IP data flow identification information that can identify the IP data flow of (A) broadcast server correspondence control information (SI) described with reference to FIGS.

The program list table (PLT) packet identification information (PLT_PID) 272 is a packet identifier (PID) set in the packet storing the program list table (PLT) included in the IP data flow identified by the IP data flow identification information 271. It is.

When reproducing data from the media, the information processing apparatus first refers to the IP data flow identification information 271 recorded in the clip information file, and thereby includes an IP data flow including a packet storing a program list table (PLT). Is determined.
further,
Program list table (PLT) packet identification information (PLT_PID) 272
It is possible to read this data, check the PID of the PLT storage packet included in the determined IP data flow, and specify the program list table (PLT) storage packet of the IP data flow based on this PID. .

Then, by referring to the program list table (PLT), the MPT PID corresponding to each data series (each IP data flow) can be acquired.

In the configuration of this example, as shown in FIG. 46 and FIG.
(A2) MMT package table (MPT) information is recorded.

As shown in FIG. 47, (A2) MMT package table (MPT) information is composed of the following data.
IP data flow identification information 273
MMT package table (MPT) packet identification information (MPT_PID) 274

The IP data flow identification information 273 includes the following five data sets described above with reference to FIG.
(1) Source IP address (src_IP_address)
(2) Destination IP address (dest_IP_address)
(3) Destination port (destination_port)
(4) Source port (source_port)
(5) Next header information (next_header)

The IP data flow identification information 273 is IP data flow identification information corresponding to an IP data flow including a packet storing an MMT package table (MPT).
That is, the IP data flow identification information that can identify the IP data flow (B) or (C) described with reference to FIGS.

The MMT package table (MPT) packet identification information (MPT_PID) 274 is a packet identifier (PID) set in a packet storing the MMT package table (MPT) included in the IP data flow identified by the IP data flow identification information 272. It is.

When reproducing data from the media, the information processing apparatus refers to the IP data flow identification information 273 recorded in the clip information file to determine the IP data flow including the packet storing the MMT package table (MPT). To do.
further,
MMT package table (MPT) packet identification information (MPT_PID) 274
It is possible to read this data, check the PID of the MPT stored packet included in the determined IP data flow, and specify the MMT package table (MPT) stored packet of the IP data flow based on this PID. .

Then, by referring to the MMT package table (MPT), it is possible to acquire a PID for each asset (image, audio, caption, etc.) corresponding to one IP data flow.

When the information processing apparatus records a clip AV stream file composed of a TLV packet sequence storing MMT format data on a medium such as a BD, the program information [ProgramInfo ()] program of the clip information file corresponding to the clip AV stream file The following information shown in FIG. 47 is recorded in the map PID [program_map_PID [i]] recording area.
(A1) Program list table (PLT) information (A2) MMT package table (MPT) information

By recording these data in the clip information file, a playback device that plays back data from the media reads the data (A1) and (A2) from the clip information file.
The playback apparatus determines the IP data flow of the program list table (PLT) stored packet based on these data, and determines the program list table (PLT) based on the packet identifier (PID) of the program list table (PLT) stored packet. ) Can be obtained.
Further, the IP data flow of the MMT package table (MPT) stored packet can be determined, and the MMT package table (MPT) can be acquired based on the packet identifier (PID) of the MMT package table (MPT) stored packet.

FIG. 48 shows the clip information file shown in FIG.
(1) Program list table (PLT) information (PLTInfo) 265
(2) MMT package table (MPT) information (MPTInfo) 266
It is a figure which shows another specific example of the said data (1), (2).

The example shown in FIG. 48 is an example of PLT information and MPT information applicable when the packet stored in the clip AV stream file is MMT format data having a compressed IP header.
FIG. 48 shows the following two data configuration examples.
(B1) Program list table (PLT) information (B2) MMT package table (MPT) information

As shown in FIG. 48, (B1) program list table (PLT) information is composed of the following data.
Context identifier (CID) 276
Program list table (PLT) packet identification information (PLT_PID) 277

The context identifier (CID) 276 is used as IP data flow identification information as described above.
The context identifier (CID) 276 is used as IP data flow identification information corresponding to an IP data flow including a packet storing a program list table (PLT).

Further, (B2) MMT package table (MPT) information is composed of the following data.
Context identifier (CID) 278
MMT package table (MPT) packet identification information (PLT_PID) 279
The context identifier (CID) 278 is used as IP data flow identification information corresponding to an IP data flow including a packet storing an MMT package table (MPT).

When the information processing apparatus records a clip AV stream file composed of a TLV packet sequence storing MMT format data stored in an IP packet having a compressed IP header on a medium such as a BD, clip information corresponding to the clip AV stream file The following information shown in FIG. 48 is recorded in the program map PID [program_map_PID [i]] recording area of the program information [ProgramInfo ()] of the file.
(B1) Program list table (PLT) information (B2) MMT package table (MPT) information

By recording these data in the clip information file, a playback device that plays back data from the media reads the data (B1) and (B2) from the clip information file.
The playback apparatus determines the IP data flow of the program list table (PLT) stored packet based on these data, and determines the program list table (PLT) based on the packet identifier (PID) of the program list table (PLT) stored packet. ) Can be obtained.
Further, the IP data flow of the MMT package table (MPT) stored packet can be determined, and the MMT package table (MPT) can be acquired based on the packet identifier (PID) of the MMT package table (MPT) stored packet.

[6-3-3. About the stream coding information recorded in the program information of the clip information file]
Next, the stream coding information recorded in the program information of the clip information file will be described.
As described above with reference to FIG.
The stream coding information [StreamCodingInfo] 215 recorded in the program information [ProgramInfo ()] of the clip information file shown in FIG. 31 records the coding (encoding) information of the playback target stream.

FIG. 49 is a diagram illustrating a data configuration (syntax) of stream coding information [StreamCodingInfo] set in the program information [ProgramInfo ()] recording area of the clip information file.
The following data is recorded in the stream coding information [StreamCodingInfo].
(1) Image stream coding information 281,
(2) audio stream coding information 282,

Various types of coding modes (coding types) of image streams and audio streams recorded on the information recording medium (media) are allowed, and identifiers corresponding to each coding type are preliminarily set for both images and sounds. It is prescribed.
In the image, for example, type identifiers = 0x01, 0x02, 0x1B, and the like are associated with each other according to the coding type (encoding type).
The audio is associated with type identifiers = 0x03, 0x04, 0x0F, 0x80, 0x81, etc., according to the coding type (encoding type).

FIG. 50 shows an example of setting the coding type of an image stream or an audio stream defined in the current BDAV format.
For example, the coding type 0x01 is an MPEG-1 image stream, 0x02 is an MPEG-2 image stream, and 0x03 is an MPEG-1 audio stream.

In the MMT format, HEVC encoding, which is an image encoding type not defined in the current BDAV format, is used.
In the MMT format, MPEG-4 AAC encoding and MPEG-4 ALS encoding, which are audio encoding types not defined in the current BDAV format, are used.
It is necessary to newly assign an encoding type identifier for these encoding types.

FIG. 50 shows a setting example of coding type identifiers of new encoded data of these MMT format data.
Coding type = 0x10 = MPEG-4 AAC encoded audio data Coding type = 0x11 = MPEG-4 ALS encoded audio data Coding type = 0x24 = HEVC encoded image data For example, a new encoding used in this way in the MMT format Sets the data coding type identifier.

Returning to FIG. 49, the description of the stream coding information [StreamCodingInfo] is continued.
(1) Information recorded as the image stream coding information 281 is the following information.
(1a) Video format (video_format)
(1b) Frame rate
(1c) Aspect ratio (aspect_ratio)

These pieces of information are information relating to images recorded on the information recording medium (media). Furthermore, when the media recording image has a format different from that of the input image (original image), for example, when the input image (original image) is data that has undergone format conversion or the like, the image information described above is used. In addition to the above, the following information is also recorded as information on the original image before conversion, that is, information on the original image input by the information processing apparatus through broadcast waves or the like.
(1d) Original video format (original_video_format)
(1e) Original aspect ratio (original_aspect_ratio)

On the other hand, (2) Information recorded as the audio stream coding information 282 is the following information.
(2a) Audio type (audio_presentation_type)
(2b) Sampling frequency (sampling_frequency)

As described above with reference to FIG. 50, new encoded data that is not defined in the current BDAV format is used as the MMT format data.
It is the following encoded data described with reference to FIG.
Coding type = 0x10 = MPEG-4 AAC encoded audio data Coding type = 0x11 = MPEG-4 ALS encoded audio data Coding type = 0x24 = HEVC encoded image data

The coding type of new encoded data used in such an MMT format must also be recorded in the stream coding information [StreamCodingInfo] shown in FIG.
FIG. 49 shows the following information recording areas as information recording areas of these new encoded data.
HEVC encoded data related information recording area 283,
MPEG-4 AAC, ALS encoded data related information recording area 284,

Thus, a new information recording area is set, and the above information (1a) to (1e) is recorded for image data, and the above information (2a) to (2b) is recorded for audio data.
For HEVC image data, it is preferable to record additional information in each of the information (1a) to (1e) described above.
An example of stream coding information [StreamCodingInfo] recording data for HEVC image data will be described with reference to FIG.

The information recorded as stream coding information about the HEVC image is the following information as shown in FIG.
(1) Video format (video_format)
(2) Frame rate
(3) Aspect ratio (aspect_ratio)
(4) Video signal transfer characteristics (video_transfer_characteristics)

These pieces of information are information relating to images recorded on the information recording medium (media). Furthermore, when the media recording image has a format different from that of the input image (original image), for example, when the input image (original image) is data that has undergone format conversion or the like, the image information described above is used. In addition to the above, the following information is also recorded as information on the original image before conversion, that is, information on the original image input by the information processing apparatus through broadcast waves or the like.
(5) Original video format (original_video_format)
(6) Original aspect ratio (original_aspect_ratio)
(7) Original video signal transfer characteristics (original_video_transfer_characteristics)

FIG. 51B is a diagram illustrating a specific recording example and meaning of video signal transfer characteristics (video_transfer_characteristics).
A value from 0 to 15 is set as the video signal transfer characteristic (video_transfer_characteristics). The meaning of each setting value is as follows.
0: Not specified 1: VUI transfer characteristics (transfer_characteristics) = 1 (Rec. ITU-R BT. 709-5)
2: VUI transfer characteristics (transfer_characteristics) = 11 (IEC 61966-2-4)
3: VUI transfer characteristics (transfer_characteristics) = 4 (Rec. ITU-R BT. 2020)
4: VUI transfer characteristics (transfer_characteristics) = 6 (SMPTE ST 2084)
5: VUI transfer characteristics (transfer_characteristics) = 8 (ARIB STD-B607)
6-15: Reserve

This video signal transfer characteristic (video_transfer_characteristics) is information indicating the correspondence between the input signal value and the output signal.
Rec. ITU-R BT. 709-5, IEC 61966-2-4, Rec. ITU-R BT. 2020, SMPTE ST 2084, and ARIB STD-B607 all show input / output characteristic curves indicating the correspondence between input signals and output signals, and have different characteristics.
Depending on whether the set value of the video signal transfer characteristic (video_transfer_characteristics) is 0 to 15, the input / output characteristic of the HEVC encoded image can be known.

As described with reference to FIG. 49, the following data is recorded in the stream coding information [StreamCodingInfo] set in the program information [ProgramInfo ()] recording area of the clip information file.
(1) Image stream coding information 281,
(2) audio stream coding information 282,

(1) Information recorded as the image stream coding information 281 is the following information.
(1a) Video format (video_format)
(1b) Frame rate
(1c) Aspect ratio (aspect_ratio)
(1d) Original video format (original_video_format)
(1e) Original aspect ratio (original_aspect_ratio)

For example, the data received by the information processing apparatus via broadcast waves or the like is MMT format data, and includes image data in a data format that is not defined in the conventional BDAV format.
Accordingly, the image information (1a) to (1e) must be changed or added in accordance with the image format stored in the MMT format data.
This modification will be described with reference to FIG.

FIG. 52 is a diagram showing a modification example of the following data recording area.
(1a) Video format (video_format)
(1d) Original video format (original_video_format)
FIG. 52 shows the following recorded data example.
(P) Conventional image format recording data (q) New image format recording data

(P) The conventional image format recording data has the following settings.
Each of the bit values 0 to 15 is a setting in which the image modes of 480i, 576i, 480p, 1080p, 720p, and 1080p are associated with each other.
Note that i means an interlace type, p means a progressive type image output configuration, and numerical values 480, 576, etc. mean the number of pixels in the horizontal direction of the image.
1080p is a progressive image with 1080 pixels in the horizontal direction.

(Q) The new image format recording data is a setting in which the definition of 4K image or 8K image is further added to the above (p) conventional image format recording data. The following additional data 286 shown in the figure is added.
Bit value: 7 = 2160p
Bit value: 8 = 4380p
2160p is a 4K image, and 4380p corresponds to an 8K image format.
These are the latest image formats that may be distributed according to the MMT format.
By adding these new definition data, the correct image data format (coding information) is recorded in the stream coding information in the clip information file defined in the BDAV format for the latest format image distributed according to the MMT format. It becomes possible.

FIG. 53 is a diagram showing a modification example of the following data recording area.
(1b) Frame rate
FIG. 53 shows the following recorded data example.
(P) Conventional frame rate recording data (q) New frame rate recording data

(P) The conventional frame rate recording data has the following settings.
Each of the bit values 0 to 15 is associated with each image having a frame rate of 24000/1001 (23.976) to 60 Hz.
(Q) The new frame rate recording data is a setting in which definition data of a higher frame rate is added to the above (p) conventional frame rate recording data. The following additional data 287 shown in the figure is added.
Bit value: 9 = 120,000 / 1001 (119.94) Hz
Bit value: 10 = 120Hz
These data are definition information of image data with a high frame rate of about 120 Hz.
These are the latest image formats that may be distributed according to the MMT format.

By adding these new definition data, the correct image data format (coding information) is recorded in the stream coding information in the clip information file defined in the BDAV format for the latest format image distributed according to the MMT format. It becomes possible.

FIG. 54 is a diagram showing a recording example of the following data.
(1c) Aspect ratio (aspect_ratio)
(1e) Original aspect ratio (original_aspect_ratio)
Regarding the aspect ratio, the distribution data according to the MMT format is also within the definition data range of the conventional BDAV format and does not need to be changed.
As shown in FIG. 54, each of bit values 0 to 15 can record data of 4: 3, 16: 9, 2.21: 2 as aspect ratios.

Furthermore, as described with reference to FIG. 49, the stream coding information [StreamCodingInfo] set in the program information [ProgramInfo ()] recording area of the clip information file includes:
(2) audio stream coding information 282,
Is recorded.

(2) Information recorded as the audio stream coding information 282 is the following information.
(2a) Audio type (audio_presentation_type)
(2b) Sampling frequency (sampling_frequency)

An example of recording these data will be described with reference to FIG.
The audio type recording data in FIG. 55 (a) has data settings that can identify various audio type information such as mono channel, stereo, and surround for bit values 0 to 15.
The sampling frequency in FIG. 55 (b) is set to data that can identify each sampling frequency of 48 to 192 kHz with respect to bit values 0 to 15.
Regarding these audio data formats, distribution data according to the MMT format is also within the range of definition data in the current BDAV format and does not require any particular change.

As described above, it is necessary to record the stream coding information [StreamCodingInfo] set in the program information [ProgramInfo ()] recording area in the clip information file defined in the BDAV format.
Specifically, as described with reference to FIG. 49 and others, it is required to record the following data.
(1) Image stream coding information,
(2) audio stream coding information,
In these stream coding information, it is necessary to record information on HEVC image data newly used in MMT format data and information on MPEG-4-AAC and ALS encoded audio data.

The information processing apparatus can apply these stream coding information to confirm the attributes of the image data and audio data to be reproduced, and perform decoding processing and reproduction processing according to the confirmed image attributes and audio attributes. It becomes.

For example, an information processing apparatus that receives distribution content (program) from a broadcasting station in MMT format data and records the received content on an information recording medium (medium), receives the image attribute information from the received data according to the MMT format data. It is necessary to extract information corresponding to (image stream coding information) and audio attribute information (audio stream coding information) and generate a clip information file in which these data are recorded.

As described above with reference to FIG. 2 and others, the MMT format data includes setting information necessary for receiving content (program) on the information processing apparatus 30 side, guide information such as a program guide, and notifications. Control information (SI) configured by information, control information, and the like is included.

The information processing apparatus 30 that receives MMT format data and records the received data on a medium uses the above-described image attribute information (image stream coding information) from control information such as TLV-SI and MMT-SI included in the MMT format. Then, data corresponding to information corresponding to the audio attribute information (audio stream coding information) is extracted, and a clip information file in which these data is recorded is generated.

[6-4. About CPI information recorded in clip information file]
Next, CPI information recorded in the clip information file will be described.
As described above with reference to FIG. 24, CPI information [CPI ()] 204 is recorded in the clip information file.
The CPI information [CPI ()] 204 is, for example, data for acquiring the data address of the playback start point, and EP_map and TU_map described above with reference to FIGS. 13 to 15 are recorded.

As described above with reference to FIG. 12, the CPI type (CPI_type) is recorded in the playlist file. The CPI type (CPI_type) is information indicating a CPI type in a clip information file referred to by a play item (PlayItem) defined in the playlist file.
CPI (Characteristic Point Information) is recording data of a clip information file, for example, data for acquiring a data address of a playback start point at which random access playback can be started.

56, the data structure (syntax) of CPI information [CPI ()] 204 recorded in the clip information file described above with reference to FIG. 24 will be described.

The CPI information [CPI ()] 204 is, for example, data for acquiring the data address of the playback start point, and EP_map and TU_map described above with reference to FIGS. 13 to 15 are recorded.
As described above, CPI (Characteristic Point Information) is recording data of a clip information file, for example, data for obtaining a data address of a reproduction start point.

As shown in FIG. 56, an EP map is recorded when CPI type = 1, and a TU map is recorded when CPI type = 2.
The example shown in FIG. 56 is an example in the case where the reproduction target data is MPEG-2TS format data. As described above with reference to FIG. 16, when the reproduction target data is MPEG-2TS format data, there is a setting of CPI type = 1, 2, and both EP map and TU map can be used. The

On the other hand, when the reproduction target data is MMT format data, as described above with reference to FIG. 16, the setting is CPI type = 3, and only the EP map can be used.

As described above with reference to FIGS. 13 to 15, the EP map has access point information corresponding to the playback start position and playback end position where random playback can be started in the playback data stored in the clip AV stream file. It is the map which recorded.
That is, the EP map includes a time stamp (PTS: presentation time stamp) representing the reproduction start position on the time axis and address information (SPN: source packet number) for packet acquisition corresponding to the packet position information. Corresponding data is recorded.

By using the EP map, the playback device uses a packet number (SPN) of a packet storing data corresponding to the data position based on a time stamp (PTS: presentation time stamp) corresponding to a randomly accessible data position. ) And the acquired SPN setting packet can be acquired and played back.

The data structure (syntax) of the EP map will be described with reference to FIG.
FIG. 57 is a diagram showing a data structure (syntax) of an EP map stored in the clip information file.
As described above with reference to FIG. 14A, the clip AV stream is a video stream composed of source packets identified by the packet identifier: PID. The video stream is distinguished for each source packet by the PID included in the header of the transport packet in the source packet.

The EP map is set for each stream identified by a packet identifier (PID).
A packet identifier (PID) for stream identification is recorded in the stream PID (stream_PID [k]) recording area 289 of the EP map shown in FIG.
Further, one stream unit EP map (EP_map_for_one_stream_PID) is recorded in the EP map recording area 290 of FIG.

However, when the reproduction target data by the EP map is MMT format data, that is, when a TLV packet sequence storing MMT format data is stored in the clip AV stream file, the clip AV stream file includes a plurality of IPs. There is a possibility that packets corresponding to data flows may be mixed, and in this case, packet identifiers (PID) may be duplicated.

That is, as described above with reference to FIGS. 32 to 34, the packet identifier (PID) is set in units of IP data flows, and a plurality of IP data flows, for example, a plurality of data series shown in FIG. Distribution processing in which A) to (C) are set as different IP data flows may be performed.
When the information processing apparatus 30 which is a receiving apparatus on the user side records all these data packets as one clip AV stream file on a medium such as BD, one packet with the same packet identifier (PID) is set. It exists in the clip AV stream file.

Therefore, when the reproduction target data by the EP map shown in FIG. 57 is MMT format data, only the packet identifier (PID) for stream identification is stored in the stream PID (stream_PID [k]) recording area 289 of the EP map shown in FIG. Even if recorded, correct playback may not be performed.

In order to solve this problem, when the reproduction target data by the EP map is MMT format data, information for identifying the IP data flow is recorded in the EP map.
An example of the data structure of the EP map corresponding to the MMT format data is shown in FIG.

The EP map corresponding to the MMT format data shown in FIG.
The IP data flow identification information 291 is recorded, and then a recording area for the stream PID (stream_PID) is set.
The IP data flow identification information 291 is IP data flow identification information similar to the program information [ProgramInfo ()] data recorded in the clip information file described above with reference to FIG.

The IP data flow identification information 291 is information for identifying the IP data flow to which the packet selected by the stream PID (stream_PID) recorded immediately after the IP data flow identification information 291 belongs.

The IP data flow identification information 291 is configured by the following data set.
(1) Source IP address (src_IP_address)
(2) Destination IP address (dest_IP_address)
(3) Destination port (destination_port)
(4) Source port (source_port)
(5) Next header information (next_header)
These data are IP packet correspondence information corresponding to the IP packet stored in the TLV packet. Note that (5) next header information (next_header) is a recording area for protocol type information, and records a fixed value [00010001] indicating UDP.

The data set composed of the data (1) to (5) is information specific to the IP data flow. For example, when a plurality of IP data flows are mixedly transmitted from the same broadcast server, the data sets (1) to (5) are data having different settings for each IP data flow.

By referring to this data, the information processing apparatus identifies the IP data flow to which the set packet of the stream PID (stream_PID) recorded following the IP data flow identification information 291 belongs.
After this IP data flow identification, a stream PID (stream_PID) setting packet is selected, and a packet storing random access reproduction target data is detected.

FIG. 59 shows the data structure of the EP map when the clip AV stream file reproduced by applying this EP map is MMT format data stored in an IP packet having a compressed IP header.

When the clip AV stream file reproduced by applying the clip information file is MMT format data stored in an IP packet having a compressed IP header, as shown in FIG.
A context identifier (CID) 292 is recorded, and then a recording area for a stream PID (stream_PID) is set.
The context identifier (CID) 292 is used as IP data flow identification information as described above with reference to FIG.

The information processing apparatus can determine the IP data flow by referring to the context identifier (CID).
The information processing apparatus refers to the context identifier (CID) 292 recorded in the EP map, and thereby the IP data flow to which the set packet of the stream PID (stream_PID) recorded following the context identifier (CID) 292 belongs. Identify.
After this IP data flow identification, a stream PID (stream_PID) setting packet is selected, and a packet storing random access reproduction target data is detected.

Next, recording data in the EP map recording area 290 in the EP map shown in FIG. 57 will be described.
As described above, specific EP map data (EP_map_for_one_stream_PID) for each stream is recorded in the EP map recording area 290.
A data configuration example of the MMT format-compliant EP map data (EP_map_for_one_stream_PID) will be described with reference to FIG.

As described above with reference to FIG. 12 and subsequent drawings, the conventional EP map corresponding to MPEG-2TS format data includes a playback start position and playback that can start random playback in playback data stored in a clip AV stream file. Access point information corresponding to the end position is recorded.
That is, in the conventional EP map corresponding to TS packets, a time stamp (PTS: presentation time stamp) expressing the reproduction start position on the time axis, and address information (SPN) for acquiring a packet corresponding to the packet position information : Source packet number) is recorded.

However, the recorded data of this EP map is applicable when the reproduction target data is MPEG-2TS format data, and cannot be used as it is when the reproduction target data is MMT format data.
FIG. 60 shows an example of an EP map corresponding to MMT format data.

FIG. 60 shows data recorded in the EP map recording area 290 in the EP map shown in FIG. 57 when the reproduction target data is MMT format data.
As shown in FIG.
(A) An example of an EP map corresponding to MMT format data has the following fields as data recording fields.
NTP time recording area (NTP_time) 293,
TLV byte address recording area (TLV_byte_address) 294,

In an NTP time recording area (NTP_time) 293, 64-bit NTP (Network Time Protocol) time is recorded.
This time information corresponds to, for example, a time stamp (PTS: presentation time stamp) that represents the reproduction start position of the random access destination included in the reproduction data reproduced by applying this EP map on the time axis.
The time information according to NTP (network time protocol) recorded in the EP map is acquired from control information (SI) such as MPT (MMT package table) described above with reference to FIG. The

In the TLV byte address recording area (TLV_byte_address) 294, address information indicating the packet position of the TLV packet storing the reproduction target data reproduced by applying this EP map is recorded.
Specifically, for example, as the position information of the reproduction target data storage packet (TLV packet) such as image (V), audio (A), or subtitle, the first packet (TLV packet) of the clip AV stream file in which this packet is stored ) Record the number of bytes from the beginning position. For example, the number of bytes is recorded with 64 bits.

The playback device
MMT byte address recording area (MMT_byte_address) 294,
Using this data, the packet position of the reproduction data storage packet can be detected immediately.

For example, as shown in FIG. 61, it is assumed that a clip AV stream file composed of a TLV packet sequence storing MMT format data is recorded on a recording medium such as a BD.
In the TLV byte address recording area (TLV_byte_address) 294, the number of bytes from the head position of the head packet (TLV packet) of the clip AV stream file storing the TLV packet storing the randomly accessible playback data is recorded.

It should be noted that a TLV packet storing reproduction data that can be accessed randomly can be determined based on the setting of a RAP (random access point) flag set in the packet header of the MMTP packet in the TLV packet.

FIG. 62 is a diagram illustrating a data configuration (syntax) of an MMTP packet constituting MMT format data transmitted from the transmission device 20 such as a broadcasting station to the information processing device 30, for example.

As described above with reference to FIG. 3, the MMTP packet is composed of an MMTP header and an MMTP payload. One type of data is stored in the MMTP payload of one MMTP packet. Specifically, for example, image (V), audio (A), caption (S), control information (MMT-SI) stored in the MMTP packet, any one of these data is stored in an individual MMTP packet. Is done.

FIG. 62 shows the data structure of one MMTP packet, which is composed of a header part 296 and a payload part 297.
Information such as the type of data stored in the payload portion 297 is recorded in the header portion 296. A random access point information flag (RAP_flag) 298 is recorded as one of the recording data of the header part 296.

The random access point information flag (RAP_flag) 298 is
It is a flag indicating whether or not the MMTP packet is a packet storing data serving as a random access point,
1 if the packet is a random access point storing data,
0 if the packet is not a random access point storing data,
A flag for this setting is recorded.

For example, a playback device that plays back data recorded on a medium checks a random access point information flag (RAP_flag) recorded in an MMTP packet header of a packet sequence constituting a clip AV stream file, and It is possible to store reproduction data that can be detected and detect packets.

As described above with reference to FIG. 14, the EP map corresponding to the MPEG-2TS format is
This is a configuration in which correspondence data between PTS (presentation time stamp) and SPN (source packet number) is recorded.
In contrast, in the MMT format, as described with reference to FIG.
Use NTP (Network Time Protocol) time instead of PTS,
A TLV byte address is used instead of SPN.

The reason for replacing the data in this way is that the data transmitted from the broadcasting station or the like according to the MMT format does not have data that matches the PTS or SPN defined in the MPEG-2TS format. This is because the size of the TS packet in the MPEG-2 TS format is fixed (188 bytes), whereas the MMTP packet according to the MMT format is an unfixed variable length packet.

[7. Configuration and processing of information processing apparatus for executing data recording processing on information recording medium]
Next, the configuration and processing of an information processing apparatus that executes data recording processing on an information recording medium will be described with reference to FIG.

As described above, the information processing apparatus according to the present disclosure records input data according to the MMT format as BDAV format data on an information recording medium such as a BD, HD, or flash memory.
Further, in this data recording process, control information, attribute information, etc. corresponding to MMT format data are recorded in a database file such as a playlist or a clip information file.

These pieces of information are acquired from, for example, TLV-SI, which is control information included in input data according to the MMT format, and various information recording tables constituting the MMT-SI. The information processing apparatus acquires various information from the received data, and records information corresponding to the media recording content in a database file such as a playlist or a clip information file defined in the BDAV format.

Hereinafter, a description will be given of a configuration and a processing sequence of an information processing apparatus that executes a process for generating an information recording medium in which such a playlist or clip information file is recorded, specifically, a data recording process for an information recording medium such as a BD. To do.

FIG. 63 is a diagram illustrating a configuration of an information processing device 300 that executes data recording processing on an information recording medium such as a BD.
The information processing apparatus 300 records a clip AV stream file and a database file such as a playlist or a clip information file on an information recording medium (recording medium) 320.

The data input unit 301 inputs MMT format data 331 for the information recording medium 320, that is, MMT format data 331 including image data, audio data, caption data, and the like.
The data input unit 301 is a receiving unit that transmits MMT format data 331, for example, a receiving unit that receives transmission data from a broadcasting station, a content server, or the like, or a media reading unit that reads data from a medium on which MMT format data 331 is recorded. Composed of etc.

The MMT format data 331 input from the data input unit 301 is data in accordance with the data format described above with reference to FIG. 2, and includes high-definition image data such as HEVC images, for example.

The MMT format data 331 is stored in the storage unit 304 under the control of the control unit 303.
The user input unit 302 inputs, for example, a data recording start request for the information recording medium 320.

When a data recording start request is input from the user input unit 302, the MMT format data 331 stored in the storage unit 304 is input to the demultiplexer (DeMUX) 305 using this input as a trigger.
The demultiplexer (DeMUX) 305 is a packet that stores data such as images, audio, and captions from the MMT format data 331, control information (TLV-SI, MMT-SI) that stores notification information, control information, and the like. The auxiliary information is acquired, classified into data type packets, and the subtitle data generation unit 311, the image data generation unit 312, the audio data generation unit 313, and the auxiliary data of the recording data generation unit 306 are classified according to the data type. The information is input to the information generation unit 314.

The subtitle data generation unit 311 acquires subtitle data from the MMT format data 331 input by the data input unit 301 and stored in the storage unit 304, and generates stream file storage data defined in the BDAV format.
The image data generation unit 312 acquires image data from the MMT format data 331 input by the data input unit 301 and stored in the storage unit 304, and generates stream file storage data defined in the BDAV format.
The audio data generation unit 313 acquires audio data from the MMT format data 331 input by the data input unit 301 and stored in the storage unit 304, and generates stream file storage data defined in the BDAV format.

The auxiliary information generation unit 314 receives control information (TLV-SI, MMT-SI) and the like stored from the MMT format data 331 input by the data input unit 301 and stored in the storage unit 304, such as notification information and control information. Auxiliary information is acquired, and data to be stored in a playlist file, clip information file, or clip AV stream file as a database file defined in the BDAV format is generated.

The multiplexer (MUX) 315 includes a caption data generation unit 311, an image data generation unit 312, subtitle, image, and audio data converted by the audio data generation unit 313, and an auxiliary information generation unit 314 provides control information ( Various information acquired from TLV-SI, MMT-SI, etc. is input, and a stream file storing these data is generated.

The database file generation unit 316 stores a database file such as a playlist file or a clip information file in which various information acquired from the control information (TLV-SI, MMT-SI) of the MMT format data 331 by the auxiliary information generation unit 314 is recorded. Generate.

The recording file 332 including the stream file data generated by the recording data generation unit 306 and the database file such as the playlist file and the clip information file is transmitted via the drive 307 by the recording unit 306 under the control of the control unit 303. The data is output to the recording medium 320 and recorded.

Next, a data recording processing sequence for the information recording medium 320 executed by the information processing apparatus 300 shown in FIG. 63 will be described with reference to the flowchart shown in FIG.

The processing according to the flow shown in FIG. 64 can be executed under the control of a data processing unit (control unit) including a CPU having a program execution function, for example, according to a program stored in the storage unit of the information processing device. it can.
Hereinafter, the processing of each step shown in the flow of FIG. 64 will be sequentially described.

(Step S101)
First, in step S101, the information processing apparatus 300 inputs MMT format data that is recording data via the data input unit 301.
The recording data includes image data, audio data, caption data, and control information (TLV-SI, MMT-SI) storing notification information and control information.

(Step S102)
Next, in step S102, the information processing apparatus 300 performs demultiplex processing of the input MMT format data, that is, data separation processing in units of data types. Separation processing of image, sound, caption, control information, etc. is executed.

(Step S103)
Next, in step S103, the information processing apparatus 300 stores the control information separated in step S102, for example, control information (TLV-SI, MMT-SI) in the memory.

(Step S104)
Next, in step S104, the information processing device 300 executes re-encoding processing of at least one of the image, audio, and caption core data separated in step S102.
This process is performed when the encoding mode of data to be recorded on the information recording medium is changed. When the received data is recorded as it is, this re-encoding process is unnecessary.

(Step S105)
Next, in step S105, the information processing apparatus 300 executes a multiplexing process of data including the image, the audio, the caption, and the reproduction control information including the data encoded in step S103. That is, a clip AV stream file generation process is executed.
Note that the playback control information stored in the clip AV stream file includes, for example, MPT (MMT package table) described with reference to FIG.

(Step S106)
Next, in step S106, the information processing apparatus 300 generates a clip information file using the configuration data of the input MMT format data.
For example, the clip information file described above with reference to FIGS. 24 to 62, that is, the clip information file corresponding to the clip AV stream file storing the MMT format data is generated.

The detailed sequence of the clip information file generation process in step S106 will be described in detail later with reference to the flow shown in FIG.

(Step S107)
Next, in step S107, the information processing apparatus 300 generates a playlist file using the configuration data of the input MMT format data.
For example, a playlist file described above with reference to FIGS. 12 to 23, that is, a playlist file corresponding to a clip AV stream file storing MMT format data is generated.
Details of the playlist file generation processing in step S107 will be described later with reference to FIG.

(Step S108)
Next, in step S108, the information processing apparatus 300 generates another database file using the input MMT format data.

(Step S109)
In step S109, the information processing apparatus 300 generates BDAV format data using the generated AV stream file and database file.

(Step S110)
Next, in step S110, the information processing apparatus 300 records the BDAV format data generated in step S109 on an information recording medium (medium).

Next, a detailed sequence of the clip information file generation process executed in step S106 will be described with reference to the flowchart shown in FIG.
Note that the flowchart shown in FIG. 65 is a clip information generation sequence used for controlling a clip AV stream file storing MMT format data.
The processing of each step in the flow shown in FIG. 65 will be described sequentially.

(Step S121)
First, in step S121, the information processing apparatus 300 checks a RAP (random access point) flag of an MMTP packet that is MMT format data stored in a clip AV stream file.
This process is the process described above with reference to FIG.
The MMTP packet in which the RAP flag = 1 is data including a random access point.

(Step S122)
Next, in step S122, the information processing apparatus 300 generates an EP map based on correspondence data between the packet position of the MMTP packet in which the RAP flag = 1 is set and time information (NTP time).
This process is a process for generating an EP map corresponding to the MMT format data described above with reference to FIGS. The packet position information uses the byte position from the beginning of the clip AV stream file (= the beginning of the first TLV packet stored in the file). The time information uses NTP (network type protocol) time.

(Step S123)
Next, in step S123, the information processing apparatus 300 sets the value of the application type (Application_type) and clip stream type (Clip_stream_type) of the clip information file to [3].

This process is the process described above with reference to FIGS. 25 to 27, and makes it possible to identify that the storage data of the clip AV stream file that is the control target data of the clip information file is MMT format data. This is a process for recording the set value.

(Step S124)
Next, in step S124, the information processing apparatus 300 records the recording rate (recording_rate) and the average rate (average_rate) of the clip information file.

This process is performed using the TS average rate (TS_average_rate) 214 described above with reference to FIG.
TS recording rate (TS_recording_rate) 215,
These data recording processes. As described above, the average bit rate and recording rate of the transport stream of the clip AV stream file that is the reproduction target data by this clip information file are expressed in units of bytes / seconds.

This bit rate information is assumed to be calculated based on the TS packet. When the reproduction target data is MMT format data having an MMT packet or a TLV packet, a bit rate corresponding to the MMT format is calculated and recorded. . Alternatively, when the reproduction target data is in the MMT format, an invalid value may be recorded in this field, and the bit rate information may not be used.

(Step S125)
Next, in step S125, the information processing apparatus 300 is the configuration data of the clip information file.
Clip information (ClipInfo),
Sequence information (SequenceInfo),
Program information (ProgramInfo),
CPI information (CPI),
Clip mark (ClipMark),
Each of these data is generated.
In each of these data generation processes, when the reproduction target data is MMT format data, for example, NTP time information is used as time information, and the packet position is the first TLV packet stored in a stream file (clip AV stream file). Get the byte count data from the beginning of and record it.

Each of the above information includes a plurality of packet identifier (PID) recording areas. When the reproduction target data is MMT format data, the following data is recorded in the packet identifier (PID) recording area.

As described with reference to FIGS. 39 to 48, any one of the following data is recorded in the packet identifier (PID) recording area (program map PID recording area) of the program information (ProgramInfo).
(A) IP data flow identification information and packet identifier (MPT_PID) of an MMT package table (MPT) stored packet
(B) Package list table (PLT) information and MMT package table (MPT) information

Note that the IP data flow identification information in (a) is composed of the following data as described above with reference to FIG. 39 and others.
(1) Source IP address (src_IP_address)
(2) Destination IP address (dest_IP_address)
(3) Destination port (destination_port)
(4) Source port (source_port)
(5) Next header information (next_header)

Alternatively, as described with reference to FIG. 45 and others, recorded in the compressed IP header,
(1) Context identifier (CID),
May be recorded as IP data flow identification information.

As described with reference to FIGS. 56 to 62, the packet identifier (PID) recording area (stream PID recording area) of the EP map [EP_map ()] recording area in the CPI information (CPI) is as follows. Record the data.
(A) IP data flow identification information and packet identifier (stream_PID)

Note that the IP data flow identification information in (a) is composed of the following data as described above with reference to FIG.
(1) Source IP address (src_IP_address)
(2) Destination IP address (dest_IP_address)
(3) Destination port (destination_port)
(4) Source port (source_port)
(5) Next header information (next_header)

Alternatively, as described with reference to FIG. 59 and others, recorded in the compressed IP header,
(1) Context identifier (CID),
May be recorded as IP data flow identification information.

By recording the above-mentioned data in the clip information file, even when a plurality of IP data flows are mixed and a packet with the same packet identifier is included in the clip AV stream file, one IP data flow is specified. Thus, it is possible to reliably select a packet included in the IP data flow.

That is, by the above process, a clip information file in which control information enabling acquisition of a specific target TLV packet is generated from a clip AV stream file that is a reproduction data storage file.

A clip information file corresponding to MMT format data is generated by processing according to the flow shown in FIG.
When the control target is a clip AV stream file storing MPEG-2TS format data, the same clip information file generation process as that of the prior art may be performed.

Next, the detailed sequence of the playlist file generation process executed in step S107 in the flow shown in FIG. 64 will be described with reference to the flowchart shown in FIG.
Note that the flowchart shown in FIG. 66 is a playlist generation sequence used for controlling a clip AV stream file storing MMT format data.
The processing of each step in the flow shown in FIG. 66 will be described sequentially.

(Step S131)
First, in step S131, the information processing apparatus 300 sets the value of the CPI type (PL_CPI_type) recorded in the playlist file to [3].

This process corresponds to the process described above with reference to FIGS.
As described with reference to “(2) New CPI type recording data (recording MPEG-2TS compatible data and MMT compatible data)” in FIG.
PL_CPI type (PL_CPI_type) = 3 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file is an MMT-compliant EP map.

(Step S132)
Next, in step S132, the information processing apparatus 300 records time information (IN_time, OUT_time) of each play item to be recorded in the playlist file as NTP time information.

This process corresponds to the process described above with reference to FIGS.
As shown in “(2) New play item information recording data (MMT compatible playlist)” in FIG.
The start time (IN_time) is playback start time information of a play item (PlayItem) playback start point. When the reproduction target data is MMT format data, time information according to NTP (Network Time Protocol) is recorded.
The end time (OUT_time) is playback end time information of the play item (PlayItem) playback end point. When the reproduction target data is MMT format data, time information according to NTP (Network Time Protocol) is recorded.

(Step S133)
Next, in step S133, the information processing apparatus 300 is playlist file configuration data.
Play item (PlayItem),
Playlist mark (PlayListMark),
Each of these data is generated.

In each of these data generation processes, when the reproduction target data is MMT format data, for example, NTP time information is used as time information, and the packet position is the first TLV packet stored in a stream file (clip AV stream file). Get the byte count data from the beginning of and record it.

Through these processes, a playlist file corresponding to MMT format data is generated.
When the control target is a clip AV stream file storing MPEG-2TS format data, a playlist file generation process similar to the conventional one may be performed.

The information processing apparatus 300 performs processing according to the flow described with reference to FIGS. 64 to 66, thereby converting the input MMT format data into a playlist file, clip information file, and clip AV stream file according to the BDAV format. Can be recorded and reproduced.

[8. Configuration and processing of information processing apparatus that executes data reproduction processing from information recording medium]
Next, the configuration and processing of an information processing apparatus that executes data reproduction processing from an information recording medium will be described with reference to FIG.

The information processing apparatus that executes the reproduction process reads the data recorded on the information recording medium attached to the apparatus and executes the reproduction process.

FIG. 67 is a diagram showing a configuration of an information processing apparatus 400 that executes a reproduction process of data recorded on an information recording medium 510 such as a BD.
The information processing apparatus 400 reads the data recorded on the information recording medium (recording medium) 510 shown in FIG. 67 and outputs it to the output device (display unit + speaker) 520. The output device 520 is, for example, a television or the like, and is a display device that includes a display, a speaker, and the like.
Note that the information processing apparatus 400 may be the same apparatus as the information processing apparatus 300 that performs the data recording described above with reference to FIG. That is, the information processing apparatus has both functions of data recording and reproduction.

The information recording medium (recording medium) 510 is a recording medium on which an AV stream file generated by the processing described with reference to FIGS. 64 to 66 and a database such as a playlist and a clip information file are recorded.

For example, the control unit 401 reads the recording data of the information recording medium 510 via the recording / reproducing unit 404 and the drive 403 based on the input of the reproduction instruction information from the user input unit 402, and the storage unit 405 as a data buffer. And the stored data is output to the reproduction processing unit 406.

The playback processing unit 406 obtains each data from the playback data read from the information recording medium 510 under the control of the control unit 401, that is, from the clip AV stream file storing each data such as image, sound, and subtitle. To generate playback data.

The demultiplexer (DeMUX) 411 acquires data storage packets storing data such as images, audio, subtitles, playlist files, clip information files, and the like, classifies them into data type packets, Depending on the type, the data is output to the caption data generation unit 412, the image data generation unit 413, the audio data generation unit 414, and the auxiliary information generation unit 415.

The caption data generation unit 412, the image data generation unit 413, and the audio data generation unit 414 execute a decoding process of the data stored in the packet and outputs the decoded data to the output data generation unit 416.
The output data generation unit 416 outputs the subtitle, image, and audio data to the output device (display unit + speaker) 520 via the input / output interface 407.

The information recording medium 510 is a stream file storing reproduction target data.
A stream file storing MPEG-2TS format data;
There may be a stream file storing MMT format data.
In this case, the information processing apparatus 400 applies a playlist file and a clip information file defined in the BDAV format, and reproduces a stream file storing MPEG-2TS format data and a stream file storing MMT format data. Processing will be executed.

For example, the auxiliary information generation unit 415 acquires the recorded content list display data stored in the playlist file and the clip information file, generates the recorded content list, and the generated list is output to the output device (display unit + speaker) 520. Is output.

The output device (display unit + speaker) 520 outputs data such as subtitles, images, and audio input from the information processing device 400 via the output device (display unit + speaker) 520.

The information recording medium 510 stores data obtained by recording MMT format data according to the BDAV format, and the information processing apparatus 400 records a playlist file and a clip information file that are database files stipulated in the BDAV format. Information is acquired and playback control processing is executed.

Next, the sequence of data reproduction processing from the information recording medium 510 executed by the information processing apparatus 400 shown in FIG. 67 will be described with reference to the flowchart shown in FIG.

68 is executed under the control of a data processing unit (control unit) including a CPU having a program execution function, for example, according to a program stored in the storage unit of the information processing apparatus 400. Can do.

68 is the information processing apparatus 400 shown in FIG. 67, and an information recording medium (recording medium) 510 is attached and recorded on the attached information recording medium 510. The information processing apparatus 400 shown in FIG. The read data is read and output to the output device (display unit + speaker) 520. The output device 520 is, for example, a television or the like, and is a display device that includes a display, a speaker, and the like.

An information recording medium (recording medium) 510 is a recording medium on which an AV stream generated by the processing described with reference to FIGS. 64 to 66 and a database such as a playlist and a clip information file are recorded.
Hereinafter, the processing of each step shown in the flow of FIG. 68 will be described sequentially.

(Step S201)
First, in step S201, the control unit 401 of the information processing apparatus 400 converts a playlist file storing reproduction control information corresponding to designated reproduction data into an information recording medium (media) according to, for example, reproduction data designation information input by the user. Read from.

(Step S202)
Next, in step S202, the control unit 401 of the information processing device 400 reads the PL_CPI type (PL_CPI_type) recorded in the playlist file.
As described above with reference to FIGS. 12 to 16, the PL_CPI type (PL_CPI_type) is information indicating the CPI type in the clip information file referenced by the play item (PlayItem) defined in the playlist file. is there.
Note that CPI (Characteristic Point Information) is recording data of a clip information file, for example, data for acquiring a data address of a reproduction start point.

As shown in FIG. 16, when the PL_CPI type (PL_CPI_type) = 1, the CPI type in the clip information file referred to by the play item (PlayItem) defined in this playlist file is an EP map that supports MPEG-2TS. It means that there is.
PL_CPI type (PL_CPI_type) = 2 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file is an MPEG-2TS compatible TU map.
PL_CPI type (PL_CPI_type) = 3 means that the CPI type in the clip information file referred to by the play item (PlayItem) defined in the playlist file is an MMT-compliant EP map.
In this way, three types of definition of PL_CPI type (PL_CPI_type) = 1 to 3 are possible, and the three CPI types can be identified.

(Step S203)
Next, in step S203, the control unit 401 of the information processing apparatus 400 determines whether or not the set value of the PL_CPI type (PL_CPI_type) read in step S202 is [3].
That is, it is determined whether or not the CPI type in the clip information file referred to by the play item (PlayItem) defined in this playlist file is an MMT-compatible EP map.

If PL_CPI type (PL_CPI_type) = 3, the determination in step S203 is Yes, and the process proceeds to step S205.
On the other hand, if the PL_CPI type (PL_CPI_type) is not 3, the determination in step S203 is No and the process proceeds to step S204.

(Step S204)
If the PL_CPI type (PL_CPI_type) is not 3, the process of step S204 is executed.
When the PL_CPI type is other than 3, the CPI type in the clip information file referred to by the play item (PlayItem) specified in the playlist file is 1 or 2, and the reproduction target data is MPEG-2TS format data. .
In this case, the information processing apparatus 400 executes a reproduction process of MPEG-2TS format data by applying a conventional reproduction processing method.

(Step S205)
On the other hand, if the PL_CPI type (PL_CPI_type) is 3, it is determined in step S205 that the reproduction target data by this playlist file is MMT format data.

(Step S206)
Next, in step S206, the information processing apparatus 400 applies a playlist corresponding to MMT format data and a clip information file, and executes a reproduction process of the data stored in the clip information file in which the MMT format data is stored.

Next, as a specific example of MMT format data playback processing, a random access playback processing sequence to which an EP map corresponding to MMT format data recorded in a clip information file is applied will be described with reference to the flowchart shown in FIG. .

The EP map corresponding to the MMT format data is an EP map having the data structure described above with reference to FIGS. 58 to 61, for example, and includes time information and stream files (clips) corresponding to randomly accessible data positions. This is an EP map composed of data corresponding to byte position information from the beginning of the first TLV packet stored in the (AV stream file).
The process of each step of the flowchart shown in FIG. 69 will be described.

(Step S211)
First, in step S211, the information processing apparatus 400 reads a clip information file name (Clip_information_file_name) from play item information of a playlist applied to random access reproduction.

This is the data recorded in the play item (PlayItem) information in the playlist file described above with reference to FIG.

(Step S212)
Next, in step S212, the information processing apparatus 400 reads a clip information file having the clip information file name (Clip_information_file_name) read from the playlist file in step S211 from the information recording medium (media).

(Step S213)
Next, in step S213, the information processing apparatus 400 specifies ATC and STC, which are clock information applied to reproduction, from the sequence information (SequenceInfo) of the clip information file. Note that these pieces of time information are recorded as NTP time information when the reproduction target data is MMT format data.

Note that the sequence information (SequenceInfo) of the clip information file has the data configuration described above with reference to FIG. 30, and information regarding the ATC (Arrival Time Clock) and STC (System Time Clock) is defined here. Has been.
ATC (arrival time clock) and STC (system time clock) are as described above with reference to FIG. 30 and are clock information applied to data reproduction.

(Step S214)
Next, in step S214, the information processing apparatus 400 acquires a playback start position (SPN_STC_Start) and a playback start time (presentation_start_time) from the sequence information (SequenceInfo) of the clip information file.

When the reproduction target data is MMT format data, the reproduction start position information is, for example, the number of bytes from the beginning of the first TLV packet stored in the stream file (clip AV stream file), and the reproduction start time is NTP It becomes time information. These pieces of information are recorded as sequence information (SequenceInfo) of the clip information file.

(Step S215)
Next, in step S215, the information processing apparatus 400 identifies the packet storing the MMT package table (MPT) from the information recorded in the program information (ProgramInfo) of the clip information file, and from the MMT package table (MPT). Information necessary for reproduction processing of MMT format data, for example, information such as a packet identifier and a decoding method is acquired.

As described above with reference to FIGS. 39 to 48, the packet identifier (PID) recording area (program map PID recording area) of the program information (ProgramInfo) of the clip information file includes the following (a), ( Any information of b) is recorded.
(A) IP data flow identification information and packet identifier (MPT_PID) of an MMT package table (MPT) stored packet
(B) Package list table (PLT) information and MMT package table (MPT) information

In step S215, the information processing apparatus 400 specifies the packet storing the MMT package table (MPT) from the information (a) or (b) recorded in the program information (ProgramInfo) of the clip information file. To do.
Further, information necessary for reproduction processing of MMT format data, such as a packet identifier and a decoding method, is obtained from the specific packet from the MMT package table (MPT).

Alternatively, as described with reference to FIG. 59 and others, recorded in the compressed IP header,
(1) Context identifier (CID),
May be recorded as IP data flow identification information.
By referring to the IP data flow identification information recorded in the clip information file, even when a plurality of IP data flows are mixed in the clip AV stream file and a packet having the same packet identifier is included, one IP It becomes possible to specify a data flow and reliably select a packet included in the IP data flow.

(Step S216)
Next, in step S216, the information processing apparatus 400 reads the EP map recording information recorded in the CPI information (CPI) of the clip information file, and acquires information necessary for random access reproduction. For example, a packet specifying process for storing random access destination data is executed.

As described with reference to FIGS. 56 to 62, the packet identifier (PID) recording area (stream PID recording area) of the EP map [EP_map ()] recording area in the CPI information (CPI) is as follows. Data is recorded.
(A) IP data flow identification information and packet identifier (stream_PID)

By referring to the data recorded in the clip information file, even when a plurality of IP data flows are mixed in the clip AV stream file and a packet having the same packet identifier is included, one IP data flow is A packet can be reliably selected based on the packet identifier (stream_PID) specified and included in the IP data flow.

(Step S217)
Next, in step S217, the information processing apparatus 400 reads the MMT format data stored in the clip AV stream file according to the recording rate (recording_rate) recorded in the clip information (ClipInfo) of the clip information file.

In the clip information (ClipInfo) of the clip information file, as described above with reference to FIG. 25, recording rate (recording_rate) information is recorded, and the information is recorded on the information recording medium (media) according to this information. The read control of the MMT format data stored in the clip AV stream file is executed.
In FIG. 25, TS_recording_rate is described as the recording rate information, but when the reproduction target data is an MMT format having an MMT packet, a bit rate corresponding to the MMT format is recorded here.

(Step S218)
Next, in step S218, the information processing apparatus 400 executes demultiplex processing, decoding processing, and reproduction processing of MMT format data stored in the clip AV stream file read from the information recording medium (media).

[9. Configuration example of information processing apparatus]
Next, an example of a hardware configuration of an information processing apparatus applicable as an information processing apparatus that executes data recording on an information recording medium and data reproduction from the information recording medium will be described with reference to FIG.

A CPU (Central Processing Unit) 601 functions as a data processing unit that executes various processes according to a program stored in a ROM (Read Only Memory) 602 or a storage unit 608. For example, processing according to the sequence described in the above-described embodiment is executed. A RAM (Random Access Memory) 603 stores programs executed by the CPU 601 and data. These CPU 601, ROM 602, and RAM 603 are connected to each other by a bus 604.

The CPU 601 is connected to an input / output interface 605 via a bus 604, and an input unit 606 including various switches, a keyboard, a mouse, and a microphone, and an output unit 607 including a display and a speaker are connected to the input / output interface 605. Yes. The CPU 601 executes various processes in response to commands input from the input unit 606 and outputs the processing results to the output unit 607, for example.

The storage unit 608 connected to the input / output interface 605 includes, for example, a hard disk and stores programs executed by the CPU 601 and various data. The communication unit 609 functions as a data communication transmission / reception unit via a network such as the Internet or a local area network, and further as a broadcast wave transmission / reception unit, and communicates with an external device.

The drive 610 connected to the input / output interface 605 drives a removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory such as a memory card, and executes data recording or reading.

[10. Summary of composition of the present disclosure]
As described above, the embodiments of the present disclosure have been described in detail with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the gist of the present disclosure. In other words, the present invention has been disclosed in the form of exemplification, and should not be interpreted in a limited manner. In order to determine the gist of the present disclosure, the claims should be taken into consideration.

The technology disclosed in this specification can take the following configurations.
(1) A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format or SPAV format, which is a data recording format for an information recording medium,
The data processing unit
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
An information processing apparatus that generates a playback control information file that records control information that enables acquisition of a specific TLV packet from the clip AV stream file.

(2) The data processing unit
The information processing apparatus according to (1), wherein a playlist file and a clip information file are generated as the reproduction control information file.

(3) The data processing unit
The information processing apparatus according to (1) or (2), wherein an average rate and a recording rate in units of TLV packets, which are constituent packets of the clip AV stream file, are recorded in the reproduction control information file.

(4) The data processing unit
The information processing apparatus according to any one of (1) to (3), wherein a file size of the clip AV stream file configured by a TLV packet is recorded in the reproduction control information file.

(5) The data processing unit
The information processing apparatus according to any one of (1) to (4), wherein NTP (network time protocol) time information received together with the MMT format data is recorded as time information to be recorded in the reproduction control information file.

(6) The data processing unit
The information processing apparatus according to any one of (1) to (5), wherein the number of bytes from the beginning of the clip AV stream file including a TLV packet sequence is recorded as data position information to be recorded in the reproduction control information file.

(7) The data processing unit
When the packet identifier is recorded in the reproduction control information file, any one of (1) to (6) is recorded together with IP data flow identification information that can identify the IP data flow to which the packet specified by the packet identifier belongs. The information processing apparatus described in 1.

(8) The IP data flow identification information is:
(A) source IP address,
(B) destination IP address,
(C) destination port,
(D) source port,
(E) Protocol type information,
The above five data, or
The information processing apparatus according to (7), including at least one of a context identifier (CID).

(9) The information processing apparatus according to (8), wherein the context identifier (CID) is data recorded in a compressed IP header.

(10) The information processing according to any one of (7) to (9), wherein the packet identifier is an identifier of a packet storing an MMT package table (MPT) or an identifier of a packet storing random access reproduction target data. apparatus.

(11) having a data processing unit for executing reproduction processing of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
An information processing apparatus that acquires reproduction target data from a TLV packet and executes reproduction control according to recorded information of the reproduction control information file.

(12) The data processing unit
The information processing apparatus according to (11), wherein reproduction control is executed by applying a playlist file and a clip information file which are the reproduction control information files.

(13) The data processing unit
From the recorded data of the playback control information file,
An average rate and a recording rate in units of TLV packets that are constituent packets of the clip AV stream file are acquired, and reading control of MMT format data from the clip AV stream file is executed according to the acquisition rate (11) or The information processing apparatus according to (12).

(14) The data processing unit
Recorded as data position information in the reproduction control information file,
The information processing apparatus according to any one of (11) to (13), wherein reproduction control is executed using byte information from the beginning of the clip AV stream file.

(15) The data processing unit
From the playback control information file,
Read IP data flow identification information and packet identifier,
Identifying an IP data flow according to the IP data flow identification information;
The information processing apparatus according to any one of (11) to (14), wherein a packet having the packet identifier is selected from a group of packets belonging to the identified IP data flow to extract a target packet.

(16) a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data;
Having a playback control information file storing playback control information of the clip AV stream file as recorded data;
The reproduction control information file is
IP data flow identification information for extracting a target packet from a TLV packet included in the clip AV stream file, and a packet identifier,
Information having a data recording configuration in which a playback device that plays back the data stored in the clip AV stream file can acquire playback target data from the TLV packet sequence with reference to the IP data flow identification information and the packet identifier recoding media.

(17) An information processing method executed in the information processing apparatus,
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The data processing unit is
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
An information processing method for generating a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.

(18) An information processing method executed in the information processing apparatus,
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit is
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
An information processing method for executing reproduction control by acquiring reproduction target data from a TLV packet according to recording information of the reproduction control information file.

(19) A program for executing information processing in an information processing device,
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The program is stored in the data processing unit.
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
A program for generating a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.

(20) A program for executing information processing in an information processing device,
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The program is stored in the data processing unit.
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
A program for acquiring reproduction target data from a TLV packet and executing reproduction control according to recorded information of the reproduction control information file.

Further, the series of processes described in the specification can be executed by hardware, software, or a combined configuration of both. When executing processing by software, the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run. For example, the program can be recorded in advance on a recording medium. In addition to being installed on a computer from a recording medium, the program can be received via a network such as a LAN (Local Area Network) or the Internet and installed on a recording medium such as a built-in hard disk.

In addition, the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Further, in this specification, the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.

As described above, according to the configuration of an embodiment of the present disclosure, a configuration in which MMT format data can be recorded on a medium as BDAV or SPAV format data and can be played back is realized.
Specifically, for example, a stream file composed of a TLV packet sequence storing MMT format data and a playback control information file are generated and recorded on a medium. In the reproduction control information file, the IP data flow identification information and the packet identifier are recorded together. The IP data flow identification information uses data including a source IP address or the like, or a CID recorded in a compressed IP header. A specific IP data flow is selected based on the IP data flow identification information, and a single packet with a packet identifier set can be selected from a group of packets belonging to the selected flow.
With this configuration, a configuration is realized in which MMT format data can be recorded on a medium as BDAV or SPAV format data and played back.

20 Transmitting Device 21 Broadcast Server 22 Data Distribution Server 30 Information Processing Device 31 BD Player 32 TV
33 PC
34 Mobile terminal 40 Information recording medium (media)
41 BD
42 HDD
43 Flash memory 300 Information processing device 301 Data input unit 302 User input unit 303 Control unit 304 Storage unit 305 Demultiplexer 306 Recording data generation unit 307 Recording unit 308 Drive 311 Subtitle data generation unit 312 Image data generation unit 313 Audio data generation unit 314 Auxiliary information generation unit 315 Multiplexer 316 Database file generation unit 320 Information recording medium 400 Information processing device 401 Control unit 402 User input unit 403 Drive 404 Recording / playback unit 405 Storage unit 406 Playback processing unit 407 Input / output I / F
411 Demultiplexer 412 Subtitle data generation unit 413 Image data generation unit 414 Audio data generation unit 415 Auxiliary information generation unit 416 Output data generation unit 510 Information recording medium 520 Output device (display unit + speaker)
601 CPU
602 ROM
603 RAM
604 bus 605 input / output interface 606 input unit 607 output unit 608 storage unit 609 communication unit 610 drive 611 removable media

Claims

A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The data processing unit
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
An information processing apparatus that generates a playback control information file that records control information that enables acquisition of a specific TLV packet from the clip AV stream file.
The data processing unit
The information processing apparatus according to claim 1, wherein a playlist file and a clip information file are generated as the reproduction control information file.
The data processing unit
The information processing apparatus according to claim 1, wherein an average rate and a recording rate in units of TLV packets that are packets constituting the clip AV stream file are recorded in the reproduction control information file.
The data processing unit
The information processing apparatus according to claim 1, wherein a file size of the clip AV stream file configured by a TLV packet is recorded in the reproduction control information file.
The data processing unit
The information processing apparatus according to claim 1, wherein NTP (network time protocol) time information received together with the MMT format data is recorded as time information to be recorded in the reproduction control information file.
The data processing unit
The information processing apparatus according to claim 1, wherein the number of bytes from the file head of the clip AV stream file formed of a TLV packet sequence is recorded as data position information to be recorded in the reproduction control information file.
The data processing unit
2. The information processing apparatus according to claim 1, wherein when the packet identifier is recorded in the reproduction control information file, the IP data flow identification information enabling identification of the IP data flow to which the packet specified by the packet identifier belongs is also recorded. .
The IP data flow identification information is:
(A) source IP address,
(B) destination IP address,
(C) destination port,
(D) source port,
(E) Protocol type information,
The above five data, or
The information processing apparatus according to claim 7, comprising at least one of a context identifier (CID).
The information processing apparatus according to claim 8, wherein the context identifier (CID) is data recorded in a compressed IP header.
The information processing apparatus according to claim 7, wherein the packet identifier is an identifier of a packet storing an MMT package table (MPT) or an identifier of a packet storing random access reproduction target data.
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
An information processing apparatus that acquires reproduction target data from a TLV packet and executes reproduction control according to recorded information of the reproduction control information file.
The data processing unit
The information processing apparatus according to claim 11, wherein reproduction control is executed by applying a playlist file and a clip information file that are the reproduction control information files.
The data processing unit
From the recorded data of the playback control information file,
12. The average rate and recording rate of each TLV packet that is a constituent packet of the clip AV stream file are acquired, and reading control of MMT format data from the clip AV stream file is executed according to the acquisition rate. The information processing apparatus described.
The data processing unit
Recorded as data position information in the reproduction control information file,
The information processing apparatus according to claim 11, wherein playback control is performed using byte information from a file head of the clip AV stream file.
The data processing unit
From the playback control information file,
Read IP data flow identification information and packet identifier,
Identifying an IP data flow according to the IP data flow identification information;
12. The information processing apparatus according to claim 11, wherein a target packet is extracted by selecting a packet having the packet identifier from a packet group belonging to the identified IP data flow.
A clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data;
Having a playback control information file storing playback control information of the clip AV stream file as recorded data;
The reproduction control information file is
IP data flow identification information for extracting a target packet from a TLV packet included in the clip AV stream file, and a packet identifier,
Information having a data recording configuration in which a playback device that plays back the data stored in the clip AV stream file can acquire playback target data from the TLV packet sequence with reference to the IP data flow identification information and the packet identifier recoding media.
An information processing method executed in an information processing apparatus,
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The data processing unit is
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
An information processing method for generating a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.
An information processing method executed in an information processing apparatus,
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The data processing unit is
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
An information processing method for executing reproduction control by acquiring reproduction target data from a TLV packet according to recording information of the reproduction control information file.
A program for executing information processing in an information processing apparatus;
The information processing apparatus includes:
A data processing unit that inputs MMT (MPEG Media Transport) format data and generates recording data in accordance with the BDAV format, which is a data recording format for an information recording medium, or SPAV format;
The program is stored in the data processing unit.
A clip AV stream file composed of a TLV packet sequence storing MMT format data as reproduction data;
A program for generating a reproduction control information file in which control information that enables acquisition of a specific TLV packet from the clip AV stream file is recorded.
A program for executing information processing in an information processing apparatus;
The information processing apparatus includes:
A data processing unit for executing a reproduction process of recorded data of the information recording medium;
The information recording medium includes a clip AV stream file composed of a TLV packet sequence storing MMT (MPEG Media Transport) format data, and a playback control information file storing playback control information of the clip AV stream file in a BDAV format. Or an information recording medium recorded according to SPAV format,
The program is stored in the data processing unit.
In the data reproduction process using the clip AV stream file constituted by the TLV packet sequence,
A program for acquiring reproduction target data from a TLV packet and executing reproduction control according to recorded information of the reproduction control information file.