JP2005332507A - Information processor, information processing method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and method for realizing seamless reproduction in reproduction of read-out data from a disk. <P>SOLUTION: In a configuration to input the recording data of the disk successively from a drive into a buffer and to decode and reproduce buffer storage data, the selection data extracted from the reproduction data is read ahead and is accumulated in the buffer on the basis of seamless reproduction bankruptcy estimated time information. For example, the data of the point where access time of the data is longer are previously stored into the buffer and are outputted together with the read-out data in reproduction order from the buffer to the decoder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information processing apparatus, an information processing method, and a computer program. More particularly, the present invention relates to an information processing apparatus, an information processing method, and a computer program for performing data reproduction processing and data re-recording processing for realizing seamless reproduction of data recorded on a disc.

  When data recorded on a disk, for example, a moving image data file, is read and played back, the controller that executes the playback control program informs the drive of the data read position and read size on the disk, and the drive instructs from the indicated position. The data of the specified size is read out and transferred to the controller side. Under the control of the controller, the image data and audio data are separated, the buffer is stored according to the separated data type, and the buffer stores the data stored in the buffer. Decoding and decompression processing is executed, and reproduction processing is executed. The decryption / decompression process of the buffer data includes processes such as a decryption process of the MPEG data if the content is MPEG data, and a decryption process of the encrypted data if the content is encrypted.

  For example, when data files having different data formats, such as MPEG data, JPEG data, and PNG data, are recorded in units of data when reproducing moving image data, these data recorded discretely on the disc Need to be read and played one after another. The controller instructs the position and size of the data file to be read to the drive, and the drive moves the head in accordance with this instruction to read the data file and transfer it to the controller side. Data reading is stopped during the head moving time, that is, the access time, and no data is supplied to the controller.

  If this data supply stop time is short, playback can be continued by decoding the data that has already been transferred from the drive to the controller and stored in the buffer, but data files that need to be read continuously are separated on the disk. If it is in the position, the access time becomes long, and as a result, the data supply stop time becomes long. If the data stored in the buffer decreases during this access period and eventually it becomes impossible to supply data from the buffer to the decoder, a temporary reproduction interruption occurs. That is, the failure of seamless reproduction occurs.

  The present invention has been made in view of the above-described problems. In a configuration in which data files that may be discretely arranged on a disk are sequentially read and data reproduction is performed, data reproduction due to lack of buffer storage data is performed. An object of the present invention is to provide an information processing apparatus, an information processing method, and a computer program for performing data reproduction processing and data re-recording processing for preventing interruption and realizing seamless reproduction.

The first aspect of the present invention is:
An information processing apparatus that executes reproduction processing of data recorded on a disc,
A buffer for sequentially inputting and storing data of different data formats recorded on the disc from the drive;
A decoder for inputting the data stored in the buffer and executing a decoding process;
A controller for performing data accumulation control on the buffer;
The controller is
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information The information processing apparatus is configured to execute a process of pre-reading from the disk and storing the selection data extracted from the disk without following the reproduction order.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the controller acquires the seamless reproduction failure estimated time information from attribute information corresponding to the disk storage data, and performs prefetch data selection processing based on the acquired time information It is the structure which performs.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the controller executes a process of selecting reproduction target data corresponding to the seamless reproduction failure estimated time and reproduction target data before the reproduction target data as prefetch data. It is the structure which carries out.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the controller uses, as pre-read data, data having a large jump distance at the time of data reading from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. It is the structure which performs the process to select.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the controller is based on a shift amount of the buffer accumulated data after reading each data calculated based on the buffer accumulated data transition information at the time of reading the reproduction order data. A configuration for performing selection of prefetched data, and a configuration for performing processing for selecting data with a small increment of the transition amount as prefetched data from the data to be reproduced prior to the data to be reproduced corresponding to the estimated seamless reproduction failure time. It is characterized by being.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus predicts a transition of the buffer accumulation amount predicted based on the arrangement information of the recording data on the disc and the data reproduction time information, Based on the transition prediction data, the seamless playback failure estimation time is calculated, and the calculated seamless playback failure estimation time information is recorded as attribute information corresponding to the content data recorded on the disc. And

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus detects a seamless reproduction failure estimated time that has occurred during execution of data reproduction processing from the disk, and the detected seamless reproduction failure estimated time information is recorded on the disk. It is the structure which performs the process recorded as attribute information corresponding to the content data recorded on this.

Furthermore, the second aspect of the present invention provides
An information processing device,
A buffer for sequentially inputting and storing data of different data formats recorded on the disc from the drive;
A decoder for inputting the data stored in the buffer and executing a decoding process;
A controller for executing re-recording control of data on the disc,
The controller is
Based on the seamless playback failure estimated time information, a plurality of selection data extracted from playback data before the seamless playback failure estimated time are connected to generate re-recorded data, and a process for executing re-recording on the disc is performed. The information processing apparatus is characterized.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the controller acquires the seamless reproduction failure estimated time information from attribute information corresponding to the disk storage data, and based on the acquired time information, It is the structure which performs the selection process of the data to perform.

  Further, in an embodiment of the information processing apparatus of the present invention, the controller selects the reproduction target data corresponding to the seamless reproduction failure estimated time and the reproduction target data before the reproduction target data as the linked re-recording data. It is the structure which performs.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the controller concatenates and rerecords data having a large jump distance at the time of data reading from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. The present invention is characterized in that a process for selecting data is executed.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the controller is based on a shift amount of the buffer accumulated data after reading each data calculated based on the buffer accumulated data transition information at the time of reading the reproduction order data. A process for selecting linked re-recorded data, and processing for selecting, as linked re-recorded data, data having a small increment of the transition amount from the playback target data before the playback target data corresponding to the seamless playback failure estimated time. It is the structure to perform.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus predicts a transition of the buffer accumulation amount predicted based on the arrangement information of the recording data on the disc and the data reproduction time information, Based on the transition prediction data, the seamless playback failure estimation time is calculated, and the calculated seamless playback failure estimation time information is recorded as attribute information corresponding to the content data recorded on the disc. And

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus detects a seamless reproduction failure estimated time that has occurred during execution of data reproduction processing from the disk, and the detected seamless reproduction failure estimated time information is recorded on the disk. It is the structure which performs the process recorded as attribute information corresponding to the content data recorded on this.

Furthermore, the third aspect of the present invention provides
An information processing method for executing reproduction processing of data recorded on a disc,
Sequentially inputting data of different data formats recorded on the disc from the drive and storing them in a buffer;
A decoding process step of inputting the data stored in the buffer and executing a decoding process;
And a control step for performing data accumulation control on the buffer,
The control step includes
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information In the information processing method, the process of pre-reading the selection data extracted from the disk and storing it in the buffer without executing the reproduction order is performed.

  Furthermore, in one embodiment of the information processing method of the present invention, the control step acquires the seamless reproduction failure estimated time information from attribute information corresponding to the disk storage data, and selects prefetched data based on the acquired time information. The method includes a step of executing processing.

  Furthermore, in an embodiment of the information processing method of the present invention, the control step includes a process of selecting reproduction target data corresponding to the seamless reproduction failure estimated time and reproduction target data before the reproduction target data as prefetch data. Including a step of executing.

  Furthermore, in an embodiment of the information processing method of the present invention, the control step includes pre-reading data that has a large jump distance at the time of data reading from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. Including a step of executing a process to select as.

  Furthermore, in an embodiment of the information processing method of the present invention, the control step is based on a shift amount of the buffer accumulated data after reading each data calculated based on the buffer accumulated data transition information at the time of reading the reproduction order data. Performing a process of selecting data having a small increment of the transition amount as prefetch data from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimation time. It is characterized by.

  Furthermore, in an embodiment of the information processing method of the present invention, the information processing method further predicts a transition of the buffer accumulation amount predicted based on the arrangement information of the recording data on the disc and the data reproduction time information. And a step of calculating a seamless reproduction failure estimated time based on the transition prediction data and recording the calculated seamless reproduction failure estimated time information as attribute information corresponding to the content data recorded on the disc. It is characterized by.

  Furthermore, in one embodiment of the information processing method of the present invention, the information processing method further detects a seamless reproduction failure estimated time that has occurred during execution of data reproduction processing from a disc, and detects the detected seamless reproduction failure estimated time information. Including a step of executing a process of recording as attribute information corresponding to content data recorded on a disc.

Furthermore, the fourth aspect of the present invention provides
An information processing method,
Based on the seamless playback failure estimated time information, a rerecorded data generation step for generating rerecorded data by connecting a plurality of selection data extracted from playback data before the seamless playback failure estimated time;
A recording step of executing a process of recording the re-recorded data on a disc;
There is an information processing method characterized by comprising:

  Furthermore, in an embodiment of the information processing method of the present invention, the re-recording data generation step acquires the seamless reproduction failure estimated time information from attribute information corresponding to the disk storage data, and connects based on the acquired time information. The method includes a step of executing a process of selecting data to be rerecorded.

  Furthermore, in one embodiment of the information processing method of the present invention, the re-recording data generating step is a step of connecting re-recording data to playback target data corresponding to the seamless playback failure estimation time and playback target data before the playback target data. Including a step of executing a process to select as.

  Furthermore, in one embodiment of the information processing method of the present invention, the re-recording data generation step includes data having a large jump distance at the time of data reading from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. Including a step of executing a process of selecting as the re-recording data.

  Furthermore, in one embodiment of the information processing method of the present invention, the re-recording data generation step includes a transition of buffer accumulated data after reading each data calculated based on buffer accumulated data transition information at the time of reading reproduction order data. A step of performing selection of linked re-recording data based on the amount, and from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimation time, data having a small increment of the transition amount as the linked re-recording data A process of selecting is executed.

  Furthermore, in an embodiment of the information processing method of the present invention, the information processing method further predicts a transition of the buffer accumulation amount predicted based on the arrangement information of the recording data on the disc and the data reproduction time information. And a step of calculating a seamless reproduction failure estimated time based on the transition prediction data and recording the calculated seamless reproduction failure estimated time information as attribute information corresponding to the content data recorded on the disc. It is characterized by.

  Furthermore, in one embodiment of the information processing method of the present invention, the information processing method further detects a seamless reproduction failure estimated time that has occurred during execution of data reproduction processing from a disc, and detects the detected seamless reproduction failure estimated time information. Including a step of executing a process of recording as attribute information corresponding to content data recorded on a disc.

Furthermore, the fifth aspect of the present invention provides
A computer program for executing reproduction processing of data recorded on a disc;
Sequentially inputting data of different data formats recorded on the disc from the drive and storing them in a buffer;
A decoding process step of inputting the data stored in the buffer and executing a decoding process;
And a control step for performing data accumulation control on the buffer,
The control step includes
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information In the computer program, the process of prefetching the selected data extracted from the disk from the disk and storing it in the buffer without following the reproduction order is executed.

Furthermore, the sixth aspect of the present invention provides
A computer program for executing information processing;
Based on the seamless playback failure estimated time information, a rerecorded data generation step for generating rerecorded data by connecting a plurality of selection data extracted from playback data before the seamless playback failure estimated time;
A recording step of executing a process of recording the re-recorded data on a disc;
There is a computer program characterized by comprising:

  The computer program of the present invention is, for example, a storage medium or communication medium provided in a computer-readable format to a computer system capable of executing various program codes, such as a CD, FD, or MO. It is a computer program that can be provided by a recording medium or a communication medium such as a network. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the computer system.

  Other objects, features, and advantages of the present invention will become apparent from a more detailed description based on embodiments of the present invention described later 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 the present invention, in the configuration in which data recorded on the disk is sequentially input from the drive to the buffer and the buffered data is decoded and played back, the seamless playback failure estimated time based on the seamless playback failure estimated time information The selection data extracted from the previous reproduction data is pre-read and stored in the buffer. For example, data at the point where the data access time becomes long can be stored in the buffer in advance and output from the buffer to the decoder together with the data read data in the reproduction order, and seamless reproduction is realized without data shortage in the buffer. Is done.

  Further, according to the configuration of the present invention, based on the seamless playback failure estimated time information, the selection data extracted from the playback data before the seamless playback failure estimated time is concatenated and re-recorded on the disc, and the re-recorded data is read out. Reproduction processing by processing was made possible. With this configuration, it is possible to read, for example, discrete arrangement data having a long access time, and seamless reproduction can be performed without data shortage in the buffer due to a decrease in access time during data reproduction. Realized.

The details of the information processing apparatus, information processing method, information recording medium, and computer program of the present invention will be described below with reference to the drawings. The description will be made in the order of the following items.
1. 1. Outline of configuration of information processing apparatus and reproduction / recording process 2. Description of file to be played and data layout on disk 3. How to read multiple files Configuration for realizing seamless playback processing

[1. Overview of information processing apparatus and playback / recording process]
First, the configuration of an information processing apparatus that executes data reproduction processing from an information recording medium (disc) 10 will be described with reference to FIG.

  The controller 100 that executes the reproduction processing program notifies the read start position and read size of the moving image file to the drive 20, and the drive 20 moves the head to the read start position on the disk 10 input from the controller 100, Perform positioning. The time required for positioning the head is the access time. The drive 20 reads data corresponding to the read size based on an instruction from the controller 100 from the positioned data read start position. The read data is subjected to demodulation processing and error correction processing in the demodulation & error correction unit 21 and input to a demultiplexer 101.

  Under the control of the controller 100, the demultiplexer 101 executes separation processing according to the type of data and inputs each separated data to the read buffers # 1 to # 4, 102-1 to 102-4 for each data. . Read buffers # 1 to # 4, 102-1 to 102-4 are input to the respective decoders 103 to 106. The controller 100 executes data input control for each buffer and data output control from each buffer to the nuclear decoder.

  In this example, the read data from the disk 10 is JPEG as compression-encoded data in addition to AVF data which is AV (audio visual) data obtained by multiplexing video data and audio data which are MPEG program streams. Data, PNG data, AC3 format, and other BGM data as audio data will be described. However, the configuration example of the encoded data described here is an example, and all of the encoded data is read from the disk. This is not essential, and may be configured to read out encoded data other than these.

  In this example, AVF data is stored in the read buffers # 1, 102-1, AVF decoding processing is executed in the AVF decoder 103, JPEG data is stored in the read buffers # 2, 102-2, and in the JPEG decoder 104 JPEG decoding processing is executed, PNG data is stored in read buffer # 3, 102-3, PNG decoding processing is executed in PNG decoder 105, audio BGM data is stored in read buffer # 4, 102-4, and BGM In the decoder 106, a decoding process corresponding to the audio BGM data is executed.

  In the case of video, the data decoded by each of the decoders 103 to 106 is combined with AVF video data, JPEG, and PNG data in the video data synthesis unit 107 under the control of the controller 101, and then displayed on a display such as an LCD or CRT. Is sent to the video output unit 109, and the user can view the video. Also, the audio data is sent to the audio output units 108 and 110 having speakers and the user can listen to the audio.

  Next, the configuration of an information processing apparatus that executes data recording processing on the information recording medium (disc) 10 will be described with reference to FIG.

  Video data is input from a video input unit 201 configured by a camera, an A / D converter, and the like, and a predetermined encoded data generation process such as an MPEG2 format is performed by an encoder 203 that executes an encoding process such as an MPEG encoding process. Compressed data is generated. Audio is input from an audio input unit 202 including a microphone, an A / D converter, and the like, and predetermined encoded data, for example, compressed data in AC3 format, for example, is generated by an encoder 204 that executes AC3 encoding processing.

  Each compressed data is converted by a multiplexer 205 into, for example, an MPEG2 system stream format (AVF). The AVF data is stored in the write buffer 206, and when a certain amount of data is accumulated in the write buffer 206, it is transferred to the drive 30. In the drive 30, an error correction code is added in the error correction code adding & modulating unit 31, The modulation process is executed, and the modulation data is recorded on the disk 10.

  Here, the information processing apparatus for executing the data reproduction process from the information recording medium (disc) 10 described with reference to FIG. 1 and the data for the information recording medium (disc) 10 described with reference to FIG. Although the information processing apparatus that executes the recording process has been described as a separate apparatus, it can also be configured as an information processing apparatus that executes the data reproduction / recording process. In this case, both configurations shown in FIGS. You will have both.

  In the data reproduction processing configuration described with reference to FIG. 1, when data files discretely recorded on the disk 10 are sequentially read and reproduced, the access time required for positioning of the read head on the drive side is during the access time. Data transfer from the disk 10 is not performed.

  However, even during this data reading stop period, the read buffers 102-1 to 4 shown in FIG. 1 store the pre-read data, and the buffer storage data is sent to the decoders 103 to 106. , Can continue playing. However, if the data in the read buffers 102-1 to 10-4 is lost, the reproduction is not continued and the reproduction is interrupted. Note that playback without interruption is called seamless playback.

  In order to realize seamless reproduction, it is necessary to guarantee the data supply from the read buffers 102-1 to 10 to the decoders 103 to 106 during the access time. The present invention provides a configuration for realizing seamless reproduction.

[2. Explanation of files to be played and data layout on the disc]
In data reading / reproduction from the disk 10, not only reproduction of AVF, which is encoded data in the MPEG2 system stream format, but also recording in a PNG file, JPEG file, and AVF in synchronization with the AVF. In some cases, different audio files may be played simultaneously.

  An example of a recording format for such discs having different data formats will be described with reference to FIGS.

  As shown in FIG. 3, the AVF file 301, the PNG file 302, the JPEG file 303, and the audio file 304, which store different encoded data, are configured as individual data files. It is recorded as unit data 313 composed of AVF data 311 that is unit data of the AVF file 301 and additional data 312 that can store the PNG file 302, JPEG file 303, and audio file 304.

  The additional data 312 of the AVF data 311 can store a PNG file 302, a JPEG file 303, and an audio file 304 that are reproduced in synchronization with the reproduction of the AVF data 311. However, the additional data 312 portion is configured to store these files as necessary, and does not necessarily store these three types of data. The AVF data 311 corresponds to image reproduction data having a reproduction time of 10 to 20 seconds.

  A set of one additional data 312 and AVF data block 311 is recorded as one unit data 313 in a continuous area of the disc. It is not essential that individual unit data is continuously recorded, but is recorded discretely on the disc. When the controller reads each unit data continuously to perform data reproduction, it notifies the drive of the data position of each unit data, and the drive executes a jump to a predetermined reading position of each unit data, and adds additional data and AVF. Read unit data consisting of data sequentially. In this jump process, an access time occurs, and the buffer storage data decreases during this access time. Note that, for example, data reproduction is performed in accordance with the regulations of AVF bit rate = maximum 15.57 Mbps and additional data transfer rate = maximum 0.256 Mbps.

  The configuration of FIG. 3 is a method in which each AVF data block is recorded in association with additional data storing a corresponding PNG file 302, JPEG file 303, and audio file 304. This recording system is called an interleaved additional header recording system because it is a system in which individual additional data is arranged discretely.

  A non-interleaved additional header recording system, which is a recording system different from the interleaved additional header recording system, will be described with reference to FIG. The non-interleaved additional header recording method shown in FIG. 4 is a method in which only additional data set for each reproduction unit is extracted and recorded in a continuous area of the disc.

  The recording method in FIG. 4 is a method in which a plurality of additional data including a PNG file 302, a JPEG file 303, and an audio file 304 are arranged and continuously recorded on a disc. Each additional data stores PNG, JPEG, and audio data that are synchronously reproduced corresponding to one AVF data block, and the reproduction time is 10 to 20 seconds as in the case of the corresponding AVF block. The total reproduction time of the additional data continuous recording area 321 is set to, for example, 100 seconds or more when the transfer rate of the additional data is 0.256 Mbps at the maximum. Although the AVF data block is not shown in FIG. 4, the AVF data block is also recorded on the disc.

[3. Explanation of how to read multiple files]
Next, details of processing for reading and playing back data files having different data formats such as AVF, PNG, JPEG, and audio recorded on the disc will be described.

First, with reference to FIG. 5, the transition of the buffer accumulation amount in general reproduction processing will be described. In the example of FIG. 5, additional data (additional data such as PNG, JPEG, audio, etc.) read from the additional data recording area recorded by the non-interleave method described with reference to FIG. 4 and reproduction by alternately reading AVF data When processing is executed,
(A) Transition of accumulated data amount of AVF read buffer (read buffer # 1, 102-1 in FIG. 1) (B) Additional data read buffer (total amount of read buffers # 2-4, 102-2-4 in FIG. 1) ) Is a graph showing the transition of accumulated data amount over time (t).

First, at time t0 to t1,
Low-rate additional data (PNG, JPEG, audio, etc.) is read from the non-interleaved additional data recording area and stored in the additional data read buffer (read buffers # 2-4, 102-2-4 in FIG. 1). By this process, as shown in the graph of FIG. 5B, the buffer accumulation data of the additional data read buffer increases. When the data amount of the additional data read buffer reaches a preset upper limit at time t1, the read head of the drive starts moving from the non-interleaved additional data recording area to the AVF data recording area.

From time t1 to t2
This is the access time for the reading head to move from the non-interleaved additional data recording area on the disc to the AVF data recording area. During this period, data reading is not performed, so the amount of data stored in any buffer does not increase.

From time t2 to t3
This is the reading period of the AVF data file from the AVF data recording area on the disc, and as shown in the graph of FIG. 5A, the amount of data stored in the AVF read buffer (read buffer # 1, 102-1 in FIG. 1) Will increase. When the amount of data stored in the AVF data read buffer exceeds a certain value at time t3, reproduction is started.

From time t3 to t4
The data in the AVF data read buffer and the additional data read buffer are supplied to the respective decoders (decoders 103 to 106 in FIG. 1). Since the AVF data is read from the AVF data recording area on the disc, the amount of data stored in the AVF data read buffer continues to increase. The buffer accumulated data of the additional data read buffer decreases because it is supplied to the respective decoders (decoders 104 to 106 in FIG. 1). When the data amount of the AVF data read buffer reaches a preset upper limit value at time t4, the drive enters a pause time.

From time t4 to t5
Drive down time. During this period, the buffer accumulation data of the AVF data read buffer decreases because it is supplied to the decoder (decoder 103 in FIG. 1). Further, the buffer accumulated data of the additional data read buffer is reduced because it is supplied to the respective decoders (decoders 104 to 106 in FIG. 1). When it is detected at time t5 that the buffer storage data amount of the additional data read buffer has decreased to a predetermined buffer storage data amount: X, the drive header is changed from the reading area of the AVF data file to the non-interleaved additional data recording area. Start moving.

From time t5 to t6
This is the access time for the read head to move from the AVF data recording area on the disc to the non-interleaved additional data recording area. During this period, no data is read, so the amount of data stored in any buffer does not increase. The buffer accumulation data of the AVF data read buffer decreases because it is supplied to the decoder (decoder 103 in FIG. 1). Further, the buffer accumulated data of the additional data read buffer is reduced because it is supplied to the respective decoders (decoders 104 to 106 in FIG. 1).

At time t6 to t7
Additional data (PNG, JPEG, audio, etc.) is read from the non-interleaved additional data recording area and stored in additional data read buffers (read buffers # 2-4, 102-2-4 in FIG. 1). By this process, as shown in the graph of FIG. 5B, the buffer accumulation data of the additional data read buffer increases. During this period, the buffer accumulated data of the AVF data read buffer decreases because it is supplied to the decoder (decoder 103 in FIG. 1). When the data amount of the additional data read buffer reaches a preset upper limit value at time t7, the drive read head starts to move from the non-interleaved additional data recording area to the AVF data recording area.

From time t7 to t8
This is the access time for the read head to move from the non-interleaved additional data recording area on the disc to the AVF data recording area. During this period, the data in each buffer is supplied to each decoder, and the storage amount decreases.

From time t8 to t9
This is the reading period of the AVF data file from the AVF data recording area on the disc, and as shown in the graph of FIG. 5A, the amount of data stored in the AVF read buffer (read buffer # 1, 102-1 in FIG. 1) Will increase. When the data amount of the AVF data read buffer reaches a preset upper limit value at time t9, the drive enters a pause time. Thereafter, the same processing is repeatedly executed.

  In such processing, seamless playback cannot be maintained because data in any of the read buffers is lost. This is a problem that occurs when data cannot be read in time because the physical arrangement of files to be read is separated and access occurs.

  The configuration of the present invention that prevents such failure of seamless reproduction will be described with reference to FIG.

  In the information processing apparatus of the present invention, it is determined whether or not seamless reproduction fails before data reproduction from the disk. That is, prior to playback, it is known in advance that there is a possibility that seamless playback may fail depending on the result of prediction or previous playback. As for prediction, transition of the storage amount of each read buffer is predicted using the file arrangement information (position, size) on the disk and the reproduction time information of the data, and the read buffer is below a specific value. By the way, it is determined that seamless playback fails.

  FIG. 6 is a diagram illustrating processing for obtaining a playback time position at which seamless playback fails. FIG. 6 is a diagram showing the time transition of the AVF read buffer accumulated data amount corresponding to FIG.

  As described with reference to FIG. 5, in the case of alternately reading AVF data and other additional data (PNG, JPEG, audio, etc.), the AVF read buffer accumulated data amount is as shown in FIG. Generate a transition.

  When the access time becomes longer, the amount of data stored in the AVF read buffer becomes a certain threshold value, the seamless playback guarantee buffer minimum allowable amount shown in FIG. 6: Mt or less, and seamless playback fails at this time point: tp. The time tp is assumed to be a seamless reproduction failure estimated time.

  In the information processing apparatus of the present invention, the transition of the accumulation amount of each read buffer is predicted using the arrangement information (position, size) of the file on the disk and the reproduction time information of the data, and the read buffer has a specific value. The following points, for example, elapsed time information from the start of playback, are estimated, and this time information is recorded as attribute information corresponding to the playback content. For example, information recorded on the disk as attribute information corresponding to the content is applied to the arrangement information (position and size) of the file on the disk.

  Alternatively, in the information processing apparatus, the playback process is actually executed, and the time tp when the read buffer becomes the seamless playback guarantee buffer minimum allowable amount Mt or less is detected as the seamless playback failure estimated time, and this time information is corresponded to the playback content. It is good also as a structure recorded as attribute information to do.

  A configuration example of an attribute information file (property file) in which point information is recorded as attribute information corresponding to playback content will be described with reference to FIG.

  A property file 350 as a file storing reproduction data attribute information includes a thumbnail entry index as a thumbnail image data indicator, a title entry index as a title data indicator, and a binary file identifier as an image data indicator. Are set for each content, the thumbnail entry index is an index for designating a thumbnail image entry corresponding to the content stored in the thumbnail image file 351, and the title entry index is corresponding to the content stored in the title file 352. An index that specifies the title entry.

  The title file 352 stores a title file header 353 and a title entry 355, and the title file header 353 stores a data type ID 354 as title data type information. The content reproduction time is stored in this data type ID. The title entry 355 has a data type ID 356 and metadata 357, stores the playback time of the content in the data type ID 356 of the title entry 355, and as the metadata 357, the predicted failure time of seamless playback, that is, seamless Reproduction failure estimation time: tp is recorded.

  The estimated seamless playback failure time tp recorded as the metadata 357 is the elapsed time information from the start of playback when the seamless playback guarantee buffer minimum allowable amount described below with reference to FIG. This time information is the time calculated based on the arrangement information (position, size) of the file on the disc recorded as attribute information corresponding to the content, or the actual reproduction process is executed and the read buffer is seamless Reproduction guarantee buffer minimum allowable amount: Information recording time when Mt or less.

[4. Configuration for realizing seamless playback processing]
Next, a configuration of an information processing apparatus that guarantees seamless reproduction and an example of reproduction processing will be described using the seamless reproduction failure estimated time: tp information. The following two modes will be sequentially described as a configuration that guarantees seamless reproduction.
(4-1) AVF data before the failure prediction time tp is prefetched and stored in the buffer. A new prefetch buffer is used, or a part of the AVF read buffer is applied as a prefetch read buffer.
(4-2) AVF data before the failure prediction time tp is rearranged and recorded on the disc.

(4-1) Application of Prefetch Read Buffer First, a configuration example in which seamless reproduction is performed by prefetching AVF data before the failure prediction time tp and storing the prefetch data in the buffer will be described.

  FIG. 8 shows an example in which AVF data to be read before the AVF data 401 including data to be reproduced at the predicted failure time tp is stored in the prefetch read buffer. Note that the prefetch read buffer may be configured as an independent buffer, but in the following description, the prefetch read buffer will be described using a partial area of the AVF read buffer. In FIG. 8, a part of the AVF read buffer 402 is applied as a read-ahead read buffer, in which AVF data to be read before the AVF data 401 including data to be reproduced at the failure prediction time tp is stored in advance. In the area other than the pre-read data buffer area of the AVF read buffer 402, data read from the disk in accordance with the reproduction order is stored.

  The configuration example of FIG. 8 shows an example in which the AVF data 401 including data to be reproduced at the failure prediction time tp and the separated AVF data scheduled to be continuously played before the failure prediction time tp are stored in the buffer as pre-read data. . The amount of data to be stored as prefetched data is determined according to the allowable buffer amount of the AVF read buffer 402.

  In the example of FIG. 9, the AVF data 401 including data to be reproduced at the failure prediction time tp and the separated AVF data scheduled to be continuously played before the failure prediction time tp have a large distance on the disk between the AVF data blocks. That is, in this example, AVF data having a long jump distance and requiring a large access time is selected, and this selection data is stored in the AVF read buffer 402 as pre-read data. In this configuration, the setting is made such that data having a long access time is selected and used as prefetch data, and data having a short access time is read out according to the normal reproduction order without prefetching.

  In the configuration of FIG. 9, since only the data having a long access time is selected from the read data before the AVF data 401 including the data to be reproduced at the failure prediction time tp and stored in the buffer, the amount of prefetched data is reduced. Therefore, it is possible to prevent the buffer storage amount of normal read data from being greatly reduced.

  FIG. 10 shows an increase in the buffer accumulation amount at the end of reading of the previous AVF data at the end of reading of each AVF data in the AVF data read before the AVF data 401 including the data to be reproduced at the failure prediction time tp. This is an example in which AVF data with a small amount of data is selected and this selection data is stored in the AVF read buffer 402 as pre-read data.

  In FIG. 10, in the AVF data 421, 422, and 423 read before the AVF data 401 including the data to be reproduced at the failure prediction time tp, the buffer accumulation amount after the reading of the AVF data 421 and the AVF data read subsequently are read. The difference from the buffer accumulation amount after the reading of 422 is the difference 431 shown in the figure, and the buffer accumulation amount after the reading of the AVF data 422 is increased from the buffer accumulation amount after the reading of the AVF data 421 is increased (+ )doing.

  However, the difference between the buffer accumulation amount after the end of reading of the AVF data 422 and the buffer accumulation amount after the end of reading of the AVF data 423 to be subsequently read is the difference 432 shown in the figure, and after the end of reading of the AVF data 422 The buffer storage amount after the end of reading of the AVF data 423 is reduced (-) from the buffer storage amount. Similarly, the difference between the buffer storage amount after the end of reading of the AVF data 423 and the buffer storage amount after the end of reading of the AVF data 401 to be subsequently read is a difference 433 shown in the figure, and the reading of the AVF data 423 is ended. The buffer accumulation amount after the end of reading of the AVF data 401 is decreased (-) from the later buffer accumulation amount.

  That is, in reading the AVF data 421 and 422, there is no problem causing a decrease in the accumulated data in the buffer and no cause of the failure of the seamless reproduction is caused. However, the reading process of the AVF data 422 and 423 and the AVF data In the reading processing of 423 and 401, the accumulated data in the buffer is reduced, and it is determined that these readings greatly affect the failure of seamless reproduction. In such a case, the AVF data having a large influence, that is, AVF data 423 and 401 are selected as prefetched data and stored in the buffer.

  In the configuration of FIG. 10, from the read data before the AVF data 401 including the data to be reproduced at the failure prediction time tp, the increase in the buffer accumulation amount at the end of reading of the previous AVF data at the end of reading of each AVF data. Since only a small amount of AVF data is selected and stored in the buffer, it is possible to reduce the amount of prefetched data, and to prevent a significant decrease in the amount of normal read data stored in the buffer.

  Next, with reference to FIG. 11, a sequence of prefetch data storage processing for the AVF read buffer, normal AVF data read and buffer storage processing, and data output processing sequence from the buffer to the decoder will be described.

  FIG. 11 shows a drive 20, a demultiplexer 101, an AVF read buffer 102-1, and an AVF decoder 103 that read data from a disk. These reference numerals correspond to those in FIG.

  The order in which data is read from the disk in the drive 20 and the data is stored in the AVF read buffer 102-1 via the demultiplexer 101 is the order of steps S11 to S14 shown in FIG.

  First, AVF data of AVF # 3 and AVF # 4 is stored in the AVF read buffer 102-1 as prefetched data. The AVF data of these AVF # 3 and AVF # 4 is prefetched AVF data selected in accordance with, for example, the prefetched data selection process shown in any of FIGS.

  These prefetch data are stored in the prefetch data buffer area of the AVF read buffer 102-1. After this pre-reading process, data reading according to the reproduction order is executed in the drive. However, skipping is executed for pre-read data. The controller 100 shown in FIG. 1 executes a data reading procedure instruction to the drive. The controller 100 selects the pre-read data and executes a read instruction for the pre-read data to the drive 20 and stores the pre-read data in the buffer. Then, the controller 100 skips the pre-read data and reads the remaining data in the reproduction order. Output a read command.

  As a result, after storing the pre-read data in step S11, AVF # 1 data is stored in the AVF read buffer 102-1 from the drive via the demultiplexer 101 in step S12, followed by AVF # 2 data, and then AVF. # 5 data is stored in the AVF read buffer 102-1.

  Next, the data stored in the AVF read buffer 102-1 is output to the AVF decoder 103 according to the reproduction order, sequentially decoded and reproduced. As shown in FIG. 11, the decoding order is not the buffer storage order, but the playback order, that is, as shown in steps S21 to S25, AVF # 1 data → AVF # 2 data → AVF # 3 data → AVF # 4 data. → The order of AVF # 5 data. Since the control of the decoding order is determined according to the time stamp set in the AVF file, it can be accurately executed according to the reproduction order.

  The time stamp information set in the AVF file will be described with reference to FIG. As shown in FIG. 12, the AVF file is composed of a plurality of AVF block data, the AVF block data is composed of a plurality of AVF samples, and the AVF sample is composed of a plurality of packs. Each pack is composed of a PES packet as a decoded data packet of image and audio data and a pack header as header information, and time stamp information as reproduction order information is stored in the pack header. The decoder performs an accurate reproduction process by executing a decoding process according to the reproduction procedure information.

  As described above, since the decoding process of the decoder is performed according to the time stamp information, even when the data storage order in the AVF read buffer is disturbed, an accurate decoding and reproduction process can be performed.

Next, transition of the buffer accumulation amount when the above-described data prefetching process is executed will be described with reference to FIG. In the example of FIG. 13, additional data (additional data such as PNG, JPEG, audio, etc.) is read from the additional data recording area recorded by the non-interleave method described with reference to FIG. 4, and reproduction is performed by alternately reading AVF data. In the processing, buffer transition is shown when a partial area of the AVF read buffer is configured as the above-described pre-read data storage area. FIGS. 13A and 13B respectively show
(A) Transition of accumulated data amount of AVF read buffer (read buffer # 1, 102-1 in FIG. 1) (B) Additional data read buffer (total amount of read buffers # 2-4, 102-2-4 in FIG. 1) ) Is a graph showing the transition of accumulated data amount over time (t).

  The transition data 511 in FIG. 13A and the transition data 512 in FIG. 13B correspond to buffer transitions when a partial area of the AVF read buffer is configured as the above-described pre-read data storage area. The transition data 501 and 502 shown in (A) and (B) are transition data when the prefetching process described above with reference to FIG. 5 is not executed, and are shown for comparison.

  First, before the time t0, an AVF data file prefetch process is executed. Data read by this prefetch process is stored in the prefetch data read buffer area 531. This prefetch data is prefetch AVF data selected in accordance with, for example, the prefetch data selection process shown in any of FIGS. Thereafter, from time t0, the AVF data file and data reading from the non-interleaved additional data recording area are alternately executed. Here, since the pre-read data has already been stored in the pre-read data read buffer area 531 in the AVF read buffer, the available data storage area of the AVF read buffer in the read processing after time t0 is the reproduction shown in the figure. A sequential read data buffer area 532 is obtained.

First, at time t0 to t1,
Low-rate additional data (PNG, JPEG, audio, etc.) is read from the non-interleaved additional data recording area and stored in the additional data read buffer (read buffers # 2-4, 102-2-4 in FIG. 1). By this process, as shown in the graph of FIG. 13B, the buffer accumulated data of the additional data read buffer increases. When the data amount of the additional data read buffer reaches a preset upper limit value at time t1, the read head of the drive starts moving from the non-interleaved additional data recording area to the AVF data recording area.

From time t1 to t2
This is the access time for the read head to move from the non-interleaved additional data recording area on the disc to the AVF data recording area. During this period, the data storage amount of any buffer for reading data does not increase. Since the buffer accumulated data of the additional data read buffer is supplied to the respective decoders (decoders 104 to 106 in FIG. 1) after time t1, it decreases.

From time t2 to t3
This is the reading period of the AVF data file from the AVF data recording area on the disc, and as shown in the graph of FIG. 5A, the amount of data stored in the AVF read buffer (read buffer # 1, 102-1 in FIG. 1) Will increase. When the data amount of the AVF data read buffer reaches the upper limit value of the reproduction order read data buffer area 532 at time t3, the drive header starts moving from the read area of the AVF data file to the non-interleaved additional data recording area. To do.

From time t3 to t4
This is the access time for the read head to move from the AVF data recording area on the disc to the non-interleaved additional data recording area. During this period, no data is read, so the amount of data stored in any buffer does not increase. The buffer accumulation data of the AVF data read buffer decreases because it is supplied to the decoder (decoder 103 in FIG. 1). Further, the buffer accumulated data of the additional data read buffer is reduced because it is supplied to the respective decoders (decoders 104 to 106 in FIG. 1).

From time t4 to t5
Additional data (PNG, JPEG, audio, etc.) is read from the non-interleaved additional data recording area and stored in additional data read buffers (read buffers # 2-4, 102-2-4 in FIG. 1). By this process, as shown in the graph of FIG. 5B, the buffer accumulation data of the additional data read buffer increases. During this period, the buffer accumulated data of the AVF data read buffer decreases because it is supplied to the decoder (decoder 103 in FIG. 1). When the data amount of the additional data read buffer reaches a preset upper limit value at time t5, the drive read head starts to move from the non-interleaved additional data recording area to the AVF data recording area.

From time t5 to t6
This is the access time for the read head to move from the non-interleaved additional data recording area on the disc to the AVF data recording area. During this period, the data in each buffer is supplied to each decoder, and the storage amount decreases.

From time t6 to t7
This is the reading period of the AVF data file from the AVF data recording area on the disc, and as shown in the graph of FIG. 5A, the amount of data stored in the AVF read buffer (read buffer # 1, 102-1 in FIG. 1) Will increase. When the data amount of the AVF data read buffer reaches the upper limit value of the reproduction order read data buffer area 532 at time t7, the drive header starts moving from the read area of the AVF data file to the non-interleaved additional data recording area. . Thereafter, the same processing is repeatedly executed.

  As described above, when a partial area of the AVF read buffer is configured as a storage area for the pre-read data described above, the upper limit of the reproduction order read data buffer area 532 is lowered. At the time of reproduction, AVF data is supplied from both the pre-read data read buffer area 531 and the reproduction order read data buffer area 532 of the AVF read buffer to the decoder (decoder 103 in FIG. 1), and decoding according to the time stamp described above, Playback processing is executed.

  As described above, when a partial area of the AVF read buffer is configured and used as a storage area for the pre-read data, the upper limit value of the AVF read buffer is set in the AVF read buffer in the read buffer accumulation amount transition prediction process. Prediction is set and set as the upper limit value of the reproduction order read data buffer area 532 excluding the pre-read data read buffer area 531 from the total data storage amount. As described above, for example, the amount of data stored in the read buffer can be seamlessly obtained by using the file arrangement information (position, size) recorded on the disc as attribute information corresponding to the content and the reproduction time information of the data. Time information when the reproduction guarantee buffer minimum allowable amount: Mt or less is estimated, and this time information: tp is recorded as attribute information corresponding to the reproduction content. It should be noted that the playback process is actually executed, and the time tp when the read buffer is equal to or less than the seamless playback guarantee buffer minimum allowable amount Mt is detected as the seamless playback failure estimated time, and this time information is used as attribute information corresponding to the playback content. It is good also as a structure to record.

(4-2) AVF data before the failure prediction time tp is rearranged and recorded on the disc.
Next, a configuration example in which seamless reproduction is performed by rearranging AVF data before the failure prediction time tp will be described.

  The prediction process of the failure prediction time tp is, for example, the arrangement information (position, size) of the file on the disk recorded on the disk as attribute information corresponding to the content, as in the configuration of the prefetching process (4-1) described above. Then, using the reproduction time information of the data, time information: tp at which the data accumulation amount of the read buffer becomes the seamless reproduction guarantee buffer minimum allowable amount: Mt or less is obtained. Alternatively, the playback process is actually executed, and the time tp when the read buffer becomes equal to or less than the seamless playback guarantee buffer minimum allowable amount Mt is obtained as the seamless playback failure estimated time.

  A rearrangement example of AVF data will be described with reference to FIG. FIG. 14 shows a rerecorded AVF 602 by connecting AVF data 601 including data to be reproduced at the predicted failure time tp and AVF data to be read before the AVF data 601 to record in a predetermined continuous recording area of the disc. This is an example. In FIG. 14, by setting the re-recording AVF data 602, the reading order is changed from AVF data 611 → AVF data 612 → AVF data 613 → AVF data 601 to AVF data 611 → re-recording AVF data 602, and jumping is performed. Access time is reduced due to reduced processing. As a result, data loss in the AVF read buffer is suppressed and seamless failure can be prevented.

  In the example of FIG. 15, the AVF data 601 including data to be reproduced at the failure prediction time tp and the separated AVF data scheduled to be continuously played before the failure prediction time tp have a large distance on the disk between the AVF data blocks. That is, this is an example in which AVF data having a long jump distance and requiring a large access time is selected, and the re-recorded AVF 602 is formed by connecting the selected data and recorded in a predetermined continuous recording area of the disc. In FIG. 15, by setting the rerecorded AVF data 602, the reading order is changed from AVF data 611 → AVF data 612 → AVF data 613 → AVF data 601 to AVF data 611 → AVF data 612 → rerecorded AVF data 602. The access time is reduced due to the reduced jump processing. As a result, data loss in the AVF read buffer is suppressed and seamless failure can be prevented.

  FIG. 16 shows an increase in the buffer storage amount at the end of reading of the previous AVF data at the end of reading of each AVF data in the AVF data read before the AVF data 601 including the data to be reproduced at the predicted failure time tp. This is an example in which AVF data with a small amount of data is selected, and the re-recorded AVF 602 is configured by concatenating the selected data and recorded in a predetermined continuous recording area of the disc.

  In FIG. 16, in the AVF data 611, 612, and 613 read before the AVF data 601 including the data to be reproduced at the failure prediction time tp, the buffer accumulation amount after the reading of the AVF data 611 and the AVF data read subsequently are read. The difference from the buffer accumulation amount after the end of reading 612 is the difference 614 shown in the figure, and the buffer accumulation amount after the end of reading of the AVF data 612 is larger than the buffer accumulation amount after the end of reading of the AVF data 611 (+ )doing.

  However, the difference between the buffer storage amount after the end of reading of the AVF data 612 and the buffer storage amount after the end of reading of the AVF data 613 to be subsequently read is the difference 615 shown in the figure, and after the end of reading of the AVF data 612 The buffer storage amount after the end of reading of the AVF data 613 is decreased (−) from the buffer storage amount. Similarly, the difference between the buffer accumulation amount after the end of reading of the AVF data 613 and the buffer accumulation amount after the end of reading of the AVF data 601 to be subsequently read is the difference 616 shown in the figure, and the reading end of the AVF data 613 is completed. The buffer accumulation amount after the end of reading of the AVF data 601 is reduced (-) from the later buffer accumulation amount.

  That is, in reading AVF data 611 and 612, there is no problem that causes a decrease in the accumulated data in the buffer and no cause of failure of seamless reproduction is caused. However, the reading process of AVF data 612 and 613 and the AVF data In the reading processing of 613 and 601, the data stored in the buffer is reduced, and it is determined that these readings greatly affect the failure of seamless reproduction. In such a case, AVF data having a large influence, that is, AVF data 613 and 601 are connected to form a re-recording AVF 602, and re-recording is performed in a predetermined continuous recording area of the disc.

  When predicting the transition of the accumulation amount of the AVF read buffer, the transition of the accumulation amount of the buffer due to the reading of the AVF before the failure estimation time is checked, and AVF data less than a certain amount of data is collectively re-recorded, Furthermore, transition of the buffer accumulation amount is predicted. If it fails as a result of the prediction, the number of AVF data accumulated is increased until it fails. This process is repeatedly executed, and based on the confirmation that the read buffer failure time does not occur, the continuous AVF data accumulated at that time is re-recorded on the disc as the final re-recorded AVF.

  Next, with reference to FIG. 17, a description will be given of a playback processing sequence for a disc having a rerecording AVF configured by the rerecording processing of any of FIGS.

  In FIG. 17, the re-recording AVF configured by the re-recording process of any of FIGS. 14 to 16 is the re-recording AVF 602, and the re-recording AVF 602 is the concatenated data of AVF # 3 and AVF # 4.

  In the reproduction processing using such re-recording AVF 602, the reading order is AVF # 1 → AVF # 2 → re-recording AVF602 → AVF # 5. In the reproduction process that does not apply the re-recording AVF 602, the reading order is AVF # 1-> AVF # 2-> AVF # 3-> AVF # 4-> AVF # 5. In the reproduction process that uses the re-recording AVF 602, the jump process is reduced. This reduces the access time. As a result, data loss in the AVF read buffer is suppressed and seamless failure can be prevented.

  With reference to FIG. 18, the transition of the data accumulation amount of the AVF read buffer in the reproduction process to which the re-recording AVF configured by any one of the re-recording processes of FIGS. 14 to 16 is applied will be described.

  FIG. 18 shows the transition data 631 of the data accumulation amount of the AVF read buffer in the reproduction process to which the re-recording AVF 602 configured by the re-recording process in any one of FIGS. A transition data 632 of the data accumulation amount of the AVF read buffer in the process is shown. The transition data 632 is equal to the transition data described above with reference to FIG. 6, and the data storage amount of the AVF read buffer becomes equal to or less than the seamless reproduction guarantee buffer minimum allowable amount Mt at a certain time: tp. Data supply from the read buffer (read buffer # 1, 102-1 shown in FIG. 1) to the decoder (AVF decoder 103 shown in FIG. 1) is interrupted, and the reproduction process is interrupted. That is, seamless playback fails.

  On the other hand, the transition data 631 of the data accumulation amount of the AVF read buffer in the reproduction processing to which the re-recording AVF 602 configured by any one of the re-recording processes of FIGS. Data supply from the AVF read buffer (read buffer # 1, 102-1 shown in FIG. 1) to the decoder (AVF decoder 103 shown in FIG. 1) is continuously executed without lowering the guaranteed buffer minimum allowable amount Mt. Therefore, seamless playback is realized. This is because the rerecording AVF 602 reduces the jump time, that is, the access time as the data reading interruption time.

  The present invention has been described in detail above 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 invention. 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 invention, the claims section described at the beginning should be considered.

  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 hard disk or ROM (Read Only Memory) as a recording medium. Alternatively, the program is temporarily or permanently stored on a removable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. It can be stored (recorded). Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, or is wirelessly transferred from the download site to the computer, or is wired to the computer via a network such as a LAN (Local Area Network) or the Internet. The computer can receive the program transferred in this manner and install it on a recording medium such as a built-in hard disk.

  Note that 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 the present invention, in the configuration in which data recorded on the disc is sequentially input from the drive to the buffer, and the data stored in the buffer is decoded and reproduced, it is based on the seamless reproduction failure estimated time information. Thus, the selection data extracted from the reproduction data before the estimated seamless reproduction failure time is pre-read and stored in the buffer. For example, data at the point where the data access time becomes longer can be stored in the buffer in advance and output from the buffer to the decoder together with the data read data in the playback order, and seamless playback is realized without data shortage in the buffer. Is done.

  Further, according to the configuration of the present invention, based on the seamless playback failure estimated time information, the selection data extracted from the playback data before the seamless playback failure estimated time is concatenated and re-recorded on the disc, and the re-recorded data is read out. Reproduction processing by processing was made possible. With this configuration, it is possible to read, for example, discrete arrangement data having a long access time, and seamless reproduction can be performed without data shortage in the buffer due to a decrease in access time during data reproduction. Realized.

It is an information processor of the present invention, and is a figure showing an example of device composition which performs data reproduction processing from an information recording medium (disc). It is an information processor of the present invention, and is a figure showing an example of device composition which performs data recording processing to an information recording medium (disc). It is a data recording format with respect to a disc, and is a figure explaining an interleave additional data recording format. It is a data recording format with respect to a disc, and is a figure explaining a non-interleave additional data recording format. It is a figure explaining the transition of the data accumulation amount of the buffer in the data reading from a disk. It is a figure explaining the failure | failure of the seamless reproduction accompanying the reduction | decrease of the data storage amount of the buffer in the data reading from a disc. It is a figure explaining the structure of the attribute information file corresponding to the content recorded on a disc. It is a figure explaining the example of a process which performs prefetch of AVF data, and implement | achieves seamless reproduction by accumulating prefetch data in a buffer. It is a figure explaining the example of a process which performs prefetch of AVF data, and implement | achieves seamless reproduction by accumulating prefetch data in a buffer. It is a figure explaining the example of a process which performs prefetch of AVF data, and implement | achieves seamless reproduction by accumulating prefetch data in a buffer. It is a figure explaining the data reproduction | regeneration processing sequence in the process structure which performs prefetch of AVF data and accumulate | stores prefetch data in a buffer. It is a figure explaining the time stamp which prescribes | regulates the decoding processing order in the case of implement | achieving seamless reproduction by performing prefetching of AVF data and accumulating prefetched data in a buffer. It is a figure explaining the transition of the buffer accumulation | storage data amount in the process which performs the prefetch of AVF data and accumulate | stores prefetch data in a buffer, and implement | achieves seamless reproduction | regeneration. It is a figure explaining the process example which implement | achieves seamless reproduction | regeneration by collectively rerecording AVF data. It is a figure explaining the process example which implement | achieves seamless reproduction | regeneration by collectively rerecording AVF data. It is a figure explaining the process example which implement | achieves seamless reproduction | regeneration by collectively rerecording AVF data. It is a figure explaining the data read-out sequence in the process structure which implement | achieves seamless reproduction | regeneration by collectively rerecording AVF data. It is a figure explaining the transition of the buffer accumulation | storage data amount in the example of a process which implement | achieves seamless reproduction | regeneration by collectively rerecording AVF data.

Explanation of symbols

10 Information recording medium (disc)
20 Drive 21 Demodulation & Error Correction Unit 30 Drive 31 Error Correction Code Assignment & Modulation Processing Unit 100 Controller 101 Demultiplexer 102-1-4 Read Buffer 103 AVF Decoder 104 JPEG Decoder 105 PNG Decoder 106 BGM Decoder 107 Video Data Synthesizer 108 Audio Output unit 109 Video output unit 110 Audio output unit 200 Controller 201 Video input unit 202 Audio input unit 203, 204 Encoder 205 Multiplexer 206 Write buffer 301 AVF file 302 PNG file 303 JPEG file 304 BGM file 311 AVF data 312 Additional data 313 Unit data 321 Additional data continuous recording area 350 Property file 351 Thumbnail image file 352 Title file 353 Title file header 354 Data type ID
355 Title data 356 Data type ID
357 Metadata 401 AVF data 402 AVF read buffer 421-423 AVF data 501, 502 Buffer accumulated data amount transition data 511, 512 Buffer accumulated data amount transition data 531 Pre-read data read buffer region 532 Playback order read data buffer region 601 AVF data 602 Re-recorded AVF data 611-613 AVF data

Claims (30)

An information processing apparatus that executes reproduction processing of data recorded on a disc,
A buffer for sequentially inputting and storing data of different data formats recorded on the disc from the drive;
A decoder for inputting the data stored in the buffer and executing a decoding process;
A controller for performing data accumulation control on the buffer;
The controller is
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information An information processing apparatus having a configuration for executing a process of pre-reading from a disk and storing the selected data extracted from the disk without following the reproduction order. The controller is
The information according to claim 1, wherein the seamless reproduction failure estimation time information is acquired from attribute information corresponding to disk storage data, and prefetch data selection processing is executed based on the acquired time information. Processing equipment. The controller is
2. The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a process of selecting reproduction target data corresponding to the seamless reproduction failure estimated time and reproduction target data before the reproduction target data as prefetch data. . The controller is
2. The configuration for executing a process of selecting data having a large jump distance at the time of data reading as pre-read data from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. The information processing apparatus described. The controller is
It is configured to perform selection of prefetched data based on a shift amount of buffer accumulated data after reading each data calculated based on buffer accumulated data transition information at the time of reading reproduction order data, and at the seamless reproduction failure estimated time The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a process of selecting data having a small increment of the shift amount as prefetch data from the reproduction target data before the corresponding reproduction target data. The information processing apparatus includes:
Predict the transition of the buffer storage amount predicted based on the recording data arrangement information and data playback time information on the disc, calculate the seamless playback failure estimated time based on the transition prediction data, and calculate the seamless playback The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a process of recording the estimated failure time information as attribute information corresponding to content data recorded on a disc. The information processing apparatus includes:
This is a configuration that detects the estimated seamless playback failure time that occurred during the execution of data playback processing from the disc and records the detected seamless playback failure estimated time information as attribute information corresponding to the content data recorded on the disc. The information processing apparatus according to claim 1, wherein the information processing apparatus is provided. An information processing device,
A buffer for sequentially inputting and storing data of different data formats recorded on the disc from the drive;
A decoder for inputting the data stored in the buffer and executing a decoding process;
A controller for executing re-recording control of data on the disc,
The controller is
Based on the seamless playback failure estimated time information, a plurality of selection data extracted from playback data before the seamless playback failure estimated time are connected to generate re-recorded data, and a process for executing re-recording on the disc is performed. A characteristic information processing apparatus. The controller is
The seamless playback failure estimation time information is acquired from attribute information corresponding to disk storage data, and a selection process of data to be linked and rerecorded is executed based on the acquired time information. The information processing apparatus according to 8. The controller is
9. The information according to claim 8, wherein a process of selecting playback target data corresponding to the seamless playback failure estimation time and playback target data before the playback target data as connected re-recording data is executed. Processing equipment. The controller is
The configuration is such that a process of selecting data having a large jump distance at the time of data reading as linked re-recorded data from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time is performed. The information processing apparatus according to 8. The controller is
The seamless reproduction failure estimation is configured to perform selection of concatenated re-recording data based on a shift amount of buffer accumulated data after reading each data calculated based on buffer accumulated data transition information at the time of reproduction order data reading. 9. The information processing according to claim 8, wherein a process of selecting data having a small increment of the transition amount as concatenated re-recording data from the reproduction target data before the reproduction target data corresponding to time is performed. apparatus. The information processing apparatus includes:
Predict the transition of the buffer storage amount predicted based on the recording data arrangement information and data playback time information on the disc, calculate the seamless playback failure estimated time based on the transition prediction data, and calculate the seamless playback 9. The information processing apparatus according to claim 8, wherein the information processing apparatus is configured to execute a process of recording the estimated failure time information as attribute information corresponding to content data recorded on a disc. The information processing apparatus includes:
This is a configuration that detects the estimated seamless playback failure time that occurred during the execution of data playback processing from the disc and records the detected seamless playback failure estimated time information as attribute information corresponding to the content data recorded on the disc. The information processing apparatus according to claim 8, wherein the information processing apparatus is provided. An information processing method for executing reproduction processing of data recorded on a disc,
Sequentially inputting data of different data formats recorded on the disc from the drive and storing them in a buffer;
A decoding process step of inputting the data stored in the buffer and executing a decoding process;
And a control step for performing data accumulation control on the buffer,
The control step includes
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information An information processing method comprising: performing a process of prefetching selection data extracted from a disk and storing the selected data in the buffer without following a reproduction order. The control step includes
16. The information according to claim 15, further comprising the step of acquiring the seamless reproduction failure estimated time information from attribute information corresponding to the disk storage data and executing a prefetch data selection process based on the acquired time information. Processing method. The control step includes
16. The information processing method according to claim 15, further comprising a step of executing a process of selecting reproduction target data corresponding to the seamless reproduction failure estimated time and reproduction target data before the reproduction target data as prefetch data. . The control step includes
16. The method according to claim 15, further comprising a step of selecting data having a large jump distance at the time of data reading as pre-read data from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. The information processing method described. The control step includes
Including a step of performing selection of prefetch data based on a shift amount of buffer accumulated data after reading each data calculated based on buffer accumulated data transition information at the time of reproduction order data reading, and the seamless reproduction failure estimated time 16. The information processing method according to claim 15, wherein a process of selecting data having a small increment of the shift amount as prefetch data from the reproduction target data before the corresponding reproduction target data is executed. The information processing method further includes:
Predict the transition of the buffer storage amount predicted based on the recording data arrangement information and data playback time information on the disc, calculate the seamless playback failure estimated time based on the transition prediction data, and calculate the seamless playback 16. The information processing method according to claim 15, further comprising a step of executing a process of recording the estimated failure time information as attribute information corresponding to the content data recorded on the disc. The information processing method further includes:
A step of detecting a seamless playback failure estimation time that occurred during execution of data playback processing from the disc, and executing a process of recording the detected seamless playback failure estimation time information as attribute information corresponding to the content data recorded on the disc. 16. The information processing method according to claim 15, further comprising: An information processing method,
Based on the seamless playback failure estimated time information, a rerecorded data generation step for generating rerecorded data by connecting a plurality of selection data extracted from playback data before the seamless playback failure estimated time;
A recording step of executing a process of recording the re-recorded data on a disc;
An information processing method characterized by comprising: The re-recording data generation step includes
The method includes: obtaining the seamless reproduction failure estimated time information from attribute information corresponding to disk storage data, and performing a process of selecting data to be linked and rerecorded based on the obtained time information. The information processing method according to 22. The re-recording data generation step includes
The information according to claim 22, further comprising a step of executing a process of selecting reproduction target data corresponding to the seamless reproduction failure estimated time and reproduction target data before the reproduction target data as linked re-recording data. Processing method. The re-recording data generation step includes
The step of executing a process of selecting data having a large jump distance at the time of data reading as linked re-recorded data from the reproduction target data before the reproduction target data corresponding to the seamless reproduction failure estimated time. The information processing method according to 22. The re-recording data generation step includes
Including the step of selecting linked re-recorded data based on the amount of change in buffer accumulated data after reading each data calculated based on buffer accumulated data transition information at the time of reproduction order data reading, and the seamless reproduction failure estimation 23. The information processing method according to claim 22, wherein a process of selecting data with a small increment of the transition amount as concatenated re-recording data from reproduction target data before reproduction target data corresponding to time is executed. The information processing method further includes:
Predict the transition of the buffer storage amount predicted based on the recording data arrangement information and data playback time information on the disc, calculate the seamless playback failure estimated time based on the transition prediction data, and calculate the seamless playback 23. The information processing method according to claim 22, further comprising a step of executing processing for recording the estimated failure time information as attribute information corresponding to content data recorded on a disc. The information processing method further includes:
A step of detecting a seamless playback failure estimation time that occurred during execution of data playback processing from the disc, and executing a process of recording the detected seamless playback failure estimation time information as attribute information corresponding to the content data recorded on the disc. The information processing method according to claim 22, further comprising: A computer program for executing reproduction processing of data stored on a disk,
Sequentially inputting data of different data formats recorded on the disc from the drive and storing them in a buffer;
A decoding process step of inputting the data stored in the buffer and executing a decoding process;
And a control step for performing data accumulation control on the buffer,
The control step includes
According to the playback order, the data of the different data formats are alternately read from the disk and stored in the buffer as a basic process. As an exception process, the playback data before the seamless playback failure estimated time information based on the seamless playback failure estimated time information A computer program that executes a process of prefetching selected data extracted from the disk and storing it in the buffer without following the reproduction order. A computer program for executing information processing;
Based on the seamless playback failure estimated time information, a rerecorded data generation step for generating rerecorded data by connecting a plurality of selection data extracted from playback data before the seamless playback failure estimated time;
A recording step of executing a process of recording the re-recorded data on a disc;
A computer program characterized by comprising:

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