JP2001078146A - Video decoding method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a video decoding method and a system that can decode video coded data so as to lose data in the case of high speed reproduction or high speed reverse reproduction of video data in a program stream in compliance with the MPEG standards. SOLUTION: In the case of separating and extracting a video elementary stream 18 from a segmented VOBU 16, a system decoder 12 inserts an attached code for start code error correction after a picture start code. In the case of decoding the video elementary stream 18, a video decoder 15 discriminates whether or not 4-byte data in succession to the picture start code are coincident with the start code of a sequence. When they are coincident, succeeding data are used for a sequence layer of a segmented VOBU 16 received next to apply decoding to data of a succeeding picture. In the case of dissidence, the attached code for start code error correction that is unnecessary data is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the MPEG standard.
More particularly, the present invention relates to a video decoding method for performing high-speed playback or high-speed reverse playback of video-coded data and a device therefor. is there.

[0002]

2. Description of the Related Art Recent advances in multimedia technology have typified DVD players and digital TV broadcast receiving set-top boxes that integrally handle a plurality of media such as digitized video, audio and data. Application devices are beginning to spread. Also, since digitized video data and audio data as they are, the code amount becomes enormous, high-efficiency compression coding technology of digital data is indispensable for efficient recording and transmission. Multimedia data multiplexing technology for integrating high-efficiency compression-encoded video data and audio data into one piece of digital data, including additional information data, is also indispensable for application to Various technologies for them are already in practical use. Such high-efficiency compression coding technology and multimedia data multiplexing technology include ISO (International
al Standards Organization) is widely used.

[0003] In a device for reproducing storage media such as a DVD player, not only normal reproduction but also a widely used VTR is widely used.
A special reproduction function such as high-speed reproduction and high-speed reverse reproduction as implemented in the above is indispensable. Hereinafter, a method of decoding video encoded data to realize high-speed reproduction and high-speed reverse reproduction of multimedia data encoded according to the MPEG standard will be described.

First, the data structure of a program stream, which is one of the multiplexing methods defined by the MPEG standard, will be described with reference to FIG. In the figure, a program stream 701 corresponds to one program (program). Program stream 701 is a series of packs 7
02, one pack 702 is composed of a pack header 703, a system header 704, and one or more packets 705.

A pack header 703 starts with a pack start code 707 (0x000001BA, 0x indicates hexadecimal notation), and immediately after that, a reference clock reference value called an SCR (System Clock Reference) is described as parameter information 708 of the pack. Is done. The system header 704 starts with a system header start code 709 (0x000001BB), and immediately after that, the bit rate, the number of audio channels, the number of video channels, and the like are described as parameter information 710 of the entire program stream.

A packet 705 starts with a packet start code 711, and immediately after that, a PTS (Presentation Time Stamp) as parameter information 712 of the packet.
A reproduction time or the like called “elementary stream” 713 is described immediately after these parameter information. This parameter information 712 is information used when decoding the video elementary stream 713.

The packet start code 711 is composed of a 3-byte packet start prefix (0x000001) and a 1-byte stream ID. The stream ID indicates the type of encoded data contained in the packet. For example, 0xEx (the last x is Represents an arbitrary value) represents a video packet, and 0xCx and 0xDx represent an audio packet.

From the above, in the MPEG standard, each start code is all 32 bits, and the first three bytes are “0x00” called a start code prefix.
It is stipulated that the type starts with "0001", and the last one byte describes the type. The same applies to a start code appearing on an elementary stream of video data described later.

Next, the data structure of a video elementary stream, which is one of the encoded data described in the above-mentioned packet and which is compression-coded according to the MPEG standard, will be described with reference to FIG. As shown in the figure,
The video elementary stream 801 includes a sequence layer 802, a group of pictures (hereinafter referred to as GOP) layer 803, a picture layer 804, a slice layer 805,
It is composed of six layers of a macro block layer 806 and a block layer 807.

[0010] One sequence, or program, is structured to begin with a sequence header 808, followed by a series of GOPs, and completed at sequence end 810. Note that the sequence header 808 may be inserted not only at the head but also at an arbitrary position between a plurality of GOPs as necessary.

A GOP 809 starts with a GOP header 811 followed by one or more pictures 812.
The picture 812 is one video frame displayed on the screen, and is classified into I picture, P picture,
There are three types of B pictures. An I picture is an intra-frame coded image that is compression-coded using data of only its own video frame, and a P picture is compression-coded using a temporally previous video frame (I picture or P picture). The forward prediction coded image and the B picture are short for bidirectional prediction coded images compressed and coded using temporally preceding and succeeding video frames (I picture or P picture). Immediately after the GOP header 811, the I picture 81
2 is coded.

A picture 812 starts with a picture header 813 and starts with a slice layer 805 and below, and a macroblock layer 80.
6, the block layer 807 is described. A slice is composed of a series of macroblocks starting from the upper left of a video frame, and a macroblock is composed of six blocks, which are basic processing units.

Sequence header 808, GOP header 8
11 and the start of the picture header 813, a start code is described. It is specified that each start code consists of a start code prefix “0x000001” of the first three bytes and an identification code of the last one byte as described above. ing. Each start code is called a sequence start code (0x000001B3), a group start code (0x000001B8), and a picture start code (0x00000100).

Incidentally, in the DVD video standard, FIG.
As shown in FIG. 3 (b), a new logical unit called a VOBU 902 composed of a series of packs 903, 904, and 905 for video and audio is newly introduced, and one VOBU 9
02 is defined as the minimum unit that guarantees synchronized playback of video and audio between 0.4 and 1.0 seconds. This V
A video elementary stream, which is video encoded data in the OBU 902, starts with a sequence header 906 as shown in FIG. 13D, and is followed by one or more GOPs 907. In some cases, the sequence end may be described at the end. The sequence header 906 describes parameter information such as a video frame size, an aspect ratio, and a frame rate, which are features common to the entire program.

Next, a method for high-speed reproduction or high-speed reverse reproduction of video encoded data in a program stream according to the MPEG standard will be described. FIG. 14 is a block diagram showing a configuration of a conventional video decoding apparatus. FIG. 15 is a diagram showing a picture of video encoded data for explaining an operation procedure of decoding video encoded data by the conventional video decoding apparatus. It is a data diagram of a layer. In FIG. 14, a video decoding device includes a transfer device 951, a system decoder 952,
Parameter memory 953, video bit buffer 95
4 and a video decoder 955.

The operation of the video decoding apparatus thus configured will be described below with reference to FIGS.
When the program stream 950 is input to the transfer device 951, a fragment VOBU 956 is extracted and repeatedly transferred to the system decoder 952. Here, FIG.
As shown, fragment VOBU 1002 is the first I
The data at the beginning of the VOBU 1001 including the picture 1005, and the end of the fragment VOBU 1002 is V
The OBU 1001 is cut at an arbitrary position.

The system decoder 952 extracts only video packets from the input fragment VOBU 956,
The parameter information 957 and the video elementary stream 958 are extracted from each video packet, and the parameter information 957 and the video bit buffer 954 are respectively extracted.
Transfer to

The video decoder 955 decodes only I pictures one after another from the video elementary stream 958 input from the video bit buffer 954 and the parameter information 957 input from the parameter memory 953 (see FIG. 15C). ) Display and output video data 959.

As described above, in the conventional video decoding device,
Program stream 950 divided in VOBU units
Is input, a fragment VOBU956, which is data at the head of the VOBU, is extracted, and the fragment VOB is further extracted.
Video elementary stream 95 included in U956
By decoding only the 8 I pictures, the video data 959 was reproduced at high speed. In addition, video data 9
When performing the high-speed reverse playback of the 59 VOBUs 956, the transfer device 911 sequentially transmits the fragment VOBUs 956
To perform high-speed reverse reproduction by separating and extracting the output.

[0020]

FIG. 16 is a diagram for explaining a defective state of high-speed reproduction or high-speed reverse reproduction of video data performed by a conventional video decoding apparatus. Referring to FIG. 14 and FIG. The problem will be described. As shown in FIG. 16, for example, a fragment VOBU1 terminated with a start code prefix 1104 of a certain start code
When the video elementary stream 958 of 1101 is transferred to the video decoder 955, it is combined with the sequence start code 1105 “0x000001B3” of the fragment VOBU2 1103 to be transferred next.
Start code prefix 11 for BU1 1101
Pseudo-picture code 1106 which should not be detected by the first byte data “00” of the sequence start code 1105 of the fragment VOBU 21103
Is formed.

Therefore, the video decoder 955 detects the pseudo picture code 1106, interprets the subsequent data as data of the picture layer, and starts decoding processing. Therefore, the fragment VOBU2 1103 which should be originally detected is read.
Cannot be detected, and as a result, the sequence start code 1105 is not detected.
There is a problem that the video data following 5 is not normally displayed on a display (not shown).

Particularly in a DVD disk system,
DVD-Video Recordi for video recording, editing and playback
As DVD recorders and editing devices that adopt this standard will be commercialized in the future, as the ng standard work is progressing, a program stream in which a plurality of sequences are concatenated will be created quite commonly. It is easily predicted that the frequency of occurrence of the above-described problem will increase.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and correctly detects a sequence start code of an input fragment VOBU at the time of high-speed reproduction or high-speed reverse reproduction of video data, and Video decoding method for displaying and outputting video data of
And an apparatus thereof.

[0024]

In order to achieve the above object, the present invention provides a video decoding method according to claim 1, wherein the video data is an intra-coded I-picture, and the correlation between the I-picture and the temporally previous frame. , And a B picture obtained by bidirectional predictive coding using a correlation with a temporally previous frame, a succeeding frame, or both preceding and succeeding frames. From a series of data streams in which encoded video data, encoded audio data obtained by encoding audio data, and additional information relating to the encoded video data and encoded audio data are multiplexed, A video decoding method for performing high-speed playback or high-speed reverse playback of video by separating and extracting, and decoding only I pictures in the video stream. Separating and extracting partial fragment data including a texture in predetermined units, and separating and extracting video coded data from the fragment data after the start code of the I picture, P picture or B picture. Inserting a start code erroneous correction additional code consisting of the first byte data of the start code of the fragment data, and decoding the I-picture and P-picture data when decoding the video encoded data separated and extracted from the fragment data. Determining whether the data following the start code of the picture or B picture matches the start code of the fragment data, and decoding the I picture included in the next fragment data if the data matches the start code of the fragment data. ,
Even if a pseudo picture start code is formed by combining the data at the end of the fragment data with the data at the head of the next fragment data, the start code of the next fragment data is accurately detected. It is assumed that.

A video decoding method according to a second aspect is the video decoding method according to the first aspect, wherein the predetermined unit is D
A VOBU unit defined by the VD video standard,
The additional code for start code error correction is "00".

According to a third aspect of the present invention, there is provided a video decoding apparatus comprising: an I picture obtained by intra-coding video data; a P picture obtained by forward prediction coding utilizing a correlation with a temporally previous frame; Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio encoding obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded to decode the video. A video decoding device that performs high-speed reproduction or high-speed reverse reproduction, and extracts partial fragment data including an I-picture from a series of input data streams. A fragment data extracting unit for separating and extracting each unit, and the video encoded data and its additional information are separated and extracted from the fragment data sent from the fragment data extracting unit. If a start code of a picture or a B picture is detected, video encoded data extracting means for inserting a start code error correction additional code consisting of the first one byte of the start code of the fragment data after the start code. A video coded data storage means for temporarily storing video coded data separated and extracted by the video coded data extraction means, and temporary information of the video coded data separated and extracted by the video coded data extraction means. Additional information storage means for storing, and video encoded data input from the video encoded data storage means. The I-picture,
When the start code of the P picture or the B picture is detected, it is determined whether the data following the start code matches the start code of the fragment data, and if the data matches, the I code included in the next fragment data is determined. Video encoded data decoding means for decoding a picture, and by combining the data at the end of the fragment data with the data at the head of the next fragment data, even if a pseudo picture start code is formed, It is characterized in that the start code of the next fragment data is accurately detected.

According to a fourth aspect of the present invention, in the video decoding apparatus according to the third aspect, the predetermined unit is D
A VOBU unit defined by the VD video standard,
The additional code for start code error correction is "00".

According to a fifth aspect of the present invention, there is provided a video decoding method, comprising: an I picture obtained by intra-coding video data; a P picture obtained by forward prediction coding utilizing a correlation with a temporally previous frame; Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio encoding obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded to decode the video. What is claimed is: 1. A video decoding method for performing high-speed reproduction or high-speed reverse reproduction, comprising: extracting partial fragment data including an I picture from the data stream in predetermined units. Extracting away, extracting separate video encoded data from the fragment data,
When decoding the encoded video data separated and extracted from the fragment data, a start code consisting of the first byte data of the start code of the fragment data is provided after the start code of the I picture, P picture, or B picture. A code error correction additional code is inserted, and it is determined whether data following the start code of the picture data matches the start code of the fragment data. If the data matches, the I code included in the next fragment data is determined. Decoding the picture, and combining the data at the end of the fragment data with the data at the head of the next fragment data to form the next fragment data accurately even if a pseudo picture start code is formed. The start code is detected.

A video decoding method according to claim 6 is the video decoding method according to claim 5, wherein the predetermined unit is D
A VOBU unit defined by the VD video standard,
The additional code for start code error correction is "00".

A video decoding apparatus according to a seventh aspect of the present invention comprises an I picture in which video data is intra-coded, a P picture obtained by forward predictive coding using a correlation with a temporally previous frame, Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio encoding obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded to decode the video. A video decoding device that performs high-speed reproduction or high-speed reverse reproduction, and extracts partial fragment data including an I-picture from a series of input data streams. Fragment data extracting means for separating and extracting each unit; video coded data extracting means for separating and extracting video coded data and its additional information from the fragment data sent from the fragment data extracting means; Encoded data storage means for temporarily storing the encoded video data separated and extracted by the encoded data extracting means, and additional information for temporarily storing additional information of the encoded video data separated and extracted by the encoded video data extracting means. Storing means for detecting a start code of the I picture, P picture, or B picture from the video coded data input from the video coded data storage means; Insert the start code error correction additional code consisting of the first byte data of the start code of Video coded data decoding means for judging whether data following the picture start code matches the start code of the fragment data, and, if so, decoding an I picture contained in the next fragment data; Even if a pseudo picture start code is formed by combining the data at the end of the fragment data and the data at the head of the next fragment data, the start code of the next fragment data is accurately detected. It is assumed that.

According to an eighth aspect of the present invention, in the video decoding apparatus according to the seventh aspect, the predetermined unit is D
A VOBU unit defined by the VD video standard,
The additional code for start code error correction is "00".

According to a ninth aspect of the present invention, there is provided a video decoding method, comprising: an I-picture obtained by intra-coding video data; a P-picture obtained by forward prediction coding using a correlation with a temporally previous frame; Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio encoding obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded to decode the video. A high-speed video decoding method for performing high-speed reproduction or high-speed reverse reproduction, wherein partial fragment data including an I picture is divided into predetermined units from the data stream. And extracting the video coded data from the fragment data, between the video coded data of the fragment data and the video coded data of the next fragment data. Inserting a start code erroneous correction code consisting of 1-byte data and an end code of the video coded data; and decoding the I picture, P picture or B picture when decoding the video coded data. It is determined whether the data following the start code matches the end code of the fragment data.
Decoding the I picture included in the next fragment data, and combining the data at the end of the fragment data with the data at the head of the next fragment data to form a pseudo picture start code. However, the present invention is characterized in that the start code of the next fragment data is accurately detected.

According to a tenth aspect of the present invention, in the video decoding method according to the ninth aspect, the predetermined unit is:
It is a VOBU unit defined by the DVD video standard, and the start code error correction additional code is “00”.
000001B7 ”.

An image decoding apparatus according to an eleventh aspect of the present invention provides an I picture in which video data is intra-coded, a P picture obtained by forward prediction encoding using a correlation with a temporally previous frame, Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio encoding obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded to decode the video. A video decoding device that performs high-speed reproduction or high-speed reverse reproduction, and converts partial fragment data including an I picture from a series of input data streams. A fragment data extracting means for separating and extracting for each fixed unit; and separating and extracting video encoded data and its additional information from the fragment data sent from the fragment data extracting means. If detected, the video coded data for inserting a start code error correcting additional code consisting of the last one byte data of the picture start code and the end code of the video coded data after the end of the fragment data. Extraction means, video coded data storage means for temporarily storing video coded data separated and extracted by the video coded data extraction means, and addition of video coded data separated and extracted by the video coded data extraction means Additional information storage means for temporarily storing information, and video encoded data input from the video encoded data storage means. The I-picture,
When a start code of a P picture or a B picture is detected, it is determined whether or not data following the start code matches the end code of the video encoded data. Video encoded data decoding means for decoding the included I picture, and a pseudo picture start code is formed by combining the data at the end of the fragment data with the data at the head of the next fragment data. In this case, the start code of the next fragment data is detected accurately.

According to a twelfth aspect of the present invention, in the video decoding apparatus according to the eleventh aspect, the predetermined unit is a VOBU unit defined by a DVD video standard, and the start code error correction additional code is used. Is "0
0000001B7 ".

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a configuration of a video decoding device according to Embodiment 1 of the present invention. As shown in the figure, the video decoding device includes a transfer device 11, a system decoder 12, a parameter memory 1
3, video bit buffer 14 and video decoder 1
5 is provided.

Hereinafter, the operation of the video decoding apparatus according to the first embodiment of the present invention will be described. When the program stream 10 is input to the transfer device 11, the fragment VOBU1
6 are extracted and repeatedly transmitted to the system decoder 12. The system decoder 12 receives the input fragment VOB.
Video packets are extracted from U16, and further, parameter information 17 and video elementary stream 18 are extracted from each video packet, and output to parameter memory 13 and video bit buffer 14, respectively. The video decoder 15 converts the video elementary stream 18 input from the video bit buffer 14 and the parameter information 17 input from the parameter memory 13 into
Only I pictures are decoded one after another.

FIG. 2 is a flowchart showing the operation procedure of the system decoder of the video decoding apparatus according to Embodiment 1 of the present invention. Hereinafter, the operation of the system decoder will be described in more detail according to the flow of FIG. First, when the fragment VOBU 16 is input from the transfer device 11, the system decoder 12 starts analyzing the fragment VOBU 16 (step S201) and continues reading data until a pack start code is detected.

Next, when the pack start code is detected in step S202, the process proceeds to step S203, and the parameter information 17 of the pack header is stored in the parameter memory until the next start code, that is, the start code of the system header or the packet header is detected. 13 is output.

Next, when the system header start code is detected in step S204, the process proceeds to step S205, and the parameter information 17 of the system header is output to the parameter memory 13 until the next packet start code is detected.

Step S204 or step S20
If the packet start code is detected in step 6, the process proceeds to step S207, and data for the packet header length excluding the packet start code is output to the parameter memory 13 as parameter information 17 of the packet header. Here, the packet header length excluding the packet start code is described in 2-byte data immediately following the packet start code. It should be noted that the method of outputting the parameter information 17 to the parameter memory 13 until the next start code is detected as in the case of the parameter information 17 of the pack header and the system header is different from the case where the head of the video elementary stream 18 has some sort of start. It is not guaranteed to start with a code.

Next, after outputting the parameter information 17 of the packet header to the parameter memory 13, the process proceeds to step S 209, where the data is read out until the start code of the pack or picture is detected, and is output to the video bit buffer 14.

Next, when a pack start code is detected in step S208, the process proceeds to step 203. Also,
If the picture start code is detected in step S208, the process proceeds to step 210, where the picture start code is output to the video bit buffer 14, and then the process proceeds to step S211 so that the start code erroneous correction code “00”, which is 1-byte data, is output. "To the video bit buffer 14.

As described above, when the system element 12 separates and extracts the video elementary stream 18 from the fragment VOBU 16, the start code error correction additional code is inserted after the picture start code, so that the video shown in FIG. Elementary stream 402
Is created. As shown in FIG. 4, in the video elementary stream 402, the picture start code 4
Immediately after 01, an additional code 403 for start code error correction
1 byte data “00” is inserted.

FIG. 3 is a flowchart showing the operation procedure of the video decoder of the video decoding apparatus according to the first embodiment of the present invention. Hereinafter, the operation of the video decoder will be described in more detail according to the flow of FIG. First, upon receiving the video elementary stream 18 from the video bit buffer 14, the video decoder 15 starts analyzing the video elementary stream 18 (step S301) and continues reading data until a sequence start code is detected.

Next, when a sequence start code is detected at step S302, the process proceeds to step S303.
The parameter information 17 of the sequence header is output to the parameter memory 13 until a group start code is detected.

Next, when a group start code is detected in step S304, the process moves to step S305.
The GOP header parameter information 17 is output to the parameter memory 13 until the start code of the next sequence or picture is detected.

Next, when a sequence start code is detected in step S306, the process proceeds to step 303. If a picture start code is detected in step S306, the process proceeds to step S307, where it is determined whether 4-byte data following the picture start code matches the sequence start code. If not, step S3
The process moves to 08. Then, in step S308, the start code error correcting additional code inserted after the picture start code read earlier is deleted.

Next, in step S309, it is determined from the parameter information 17 of the picture header, which is input from the parameter memory 13, whether or not the picture to be decoded is an I-picture. Then, the process proceeds to step S310 to perform a decoding process for the picture layer and below. Step S3
In step 09, if it is determined that the picture is not an I picture, the flow advances to step S311 to discard input data until the start code of the next sequence, group or picture is detected.

Next, in step S311, when any of a sequence start code, a group start code, and a picture start code is detected, step S303, step S305, or step S305 is performed.
The processing moves to 307.

As described above, when the system decoder 12 separates and extracts the video elementary stream 18 from the fragment VOBU 16, the start code error correction additional code "00" inserted immediately after the picture start code is originally detected. If the start code error correction additional code “00” is inserted immediately after the picture start code to be inserted, the data is unnecessary data. Therefore, when the video decoder 15 determines that the 4-byte data immediately following the picture start code is not a sequence start code in step S307, the video decoder 15 deletes the start code error correction additional code in step S308.

Conversely, when the 4-byte data following the picture start code matches the sequence start code, the video decoder 15 determines that the picture start code detected in step S306 is the start code prefix at the end of the VOBU and the next VOBU. Can be determined to be a pseudo picture start code consisting of the first one byte data "00" of the sequence start code of step S3.
03, and the data processing of the subsequent sequence is performed.

As described above, according to the MPEG standard, it is guaranteed that the one-byte data "00" at the head of the three-byte data immediately after the picture start code does not match the sequence start code. Reference numeral 15 can easily determine whether the detected picture start data is a picture start code to be originally detected or a pseudo picture start code.

FIG. 5 is a diagram for explaining an improvement in high-speed reproduction or high-speed reverse reproduction of video data realized by the video decoding apparatus according to the first embodiment of the present invention. As shown in the figure, a fragment VOBU1 501 terminated with a start code prefix 504 of a certain start code is
When the start code prefix 504 is transferred from the transfer device 11 to the system decoder 12, the start code prefix 504 is combined with the sequence start code 505 of the fragment VOBU2 503 to be transferred next. 506
Is formed. However, since the system decoder 12 inserts the start code error correction additional code “00” 507 after the pseudo picture start code 506,
The start code error correction additional code “00” and the sequence start code 505 of the fragment VOBU2 503
The third half byte data "0001B3" of the
The sequence start code 508 of OBU2 503 is reproduced.

After detecting the pseudo picture start code 506 from the input video elementary stream 18, the video decoder 15 reads the sequence start code 5 reproduced by the system decoder 12.
08, it is possible to decode the I picture of the fragment VOBU2 503, which has not been decoded conventionally.

As described above, according to the video decoding apparatus according to Embodiment 1 of the present invention, when the video elementary stream 18 is separated and extracted from the fragment VOBU 16,
When the start code error correction additional code is inserted after the picture start code and the video elementary stream 18 is decoded, it is determined whether 4-byte data following the picture start code matches the sequence start code. If the data match, the subsequent data is processed as the sequence layer of the fragment VOBU 16 input next, so that the data at the end of the fragment VOBU 16 and the data at the head of the next fragment VOBU 16 are combined, so that the pseudo picture start is started. Even when a code is formed, the start code of the next fragment VOBU 16 can be reliably detected, and this has the effect that the I picture included in the fragment VOBU 16 can be decoded.

Embodiment 2 In the first embodiment of the present invention, the system decoder inserts the additional code for incorrectly correcting the start code immediately after the detection of the picture start code, but in the second embodiment of the present invention, the video decoder performs this processing. FIG. 6 is a flowchart showing the operation procedure of the system decoder of the video decoding apparatus according to Embodiment 2 of the present invention. Hereinafter, the operation of the system decoder will be described according to the flow of FIG. In the figure,
2 are the same or corresponding parts, and the operation flow of the first embodiment of the present invention is applied except for step S1208.

The system decoder 12 proceeds to step S20
In steps 1 to S207, each time a start code of a pack, a system or a packet is detected, each parameter information is output to the parameter memory 13.

After detecting the packet start code in step S206 and outputting the parameter information of the packet header to the parameter memory 13 in step S207, the process proceeds to step S209, where the data is read out until the pack start code is detected, and the video bit is read. Output to the buffer 14.

That is, unlike the first embodiment of the present invention, when detecting the picture start code, the system decoder 12 does not insert the start code erroneous correction additional code after the picture start code. In this case, the detection of the picture start code is unnecessary, and here, only the pack start code is detected.

FIG. 7 is a flowchart showing the operation procedure of the video decoder of the video decoding apparatus according to the second embodiment of the present invention. Hereinafter, the operation of the video decoder will be described according to the flow of FIG. In the figure, FIG.
The same reference numerals as those in FIG.
Except for 307 and step S1308, the operation flow of the first embodiment of the present invention is applied. Video decoder 1
5: in steps S301 to S305,
When a sequence start code or a group start code is detected from the elementary stream, each parameter information is output to the parameter memory 13.

Next, when a picture start code is detected in step S306, the process proceeds to step S1307,
Immediately after the picture start code, the start code error correction additional code "00" is inserted, and step S1308 is performed.
It is determined whether the 4-byte data following the picture start code matches the sequence start code. If they match, the process proceeds to step S303.
If they do not match, the process moves to step S308.

In step S308, the error correcting additional code "00" inserted after the picture start code is deleted, and in step S309,
It is determined whether or not the data following the picture start code is an I picture. If the data is an I picture, the decoding process is performed in step S310.

As described above, every time the video decoder 15 detects the picture start code, the video decoder 15 adds the start code erroneous correction code “00” of 1-byte data after the picture start code.
As shown in FIG. 5, the video elementary stream 18 of the fragment VOBU1 501 and the fragment VOBU2 503 terminated with a start code prefix 504 of a certain start code is
5, the start code erroneous correction additional code “00” 507 added immediately after the pseudo picture start code 506 and the latter half 3 byte data “0001B3” of the sequence start code 505 of the fragment VOBU2 503. , The sequence start code 508 of the fragment VOBU 2503 is reproduced. Accordingly, the I of the fragment VOBU2 503 which was not
The picture is decoded by the video decoder 15 and displayed on the display as video data 19.

As described above, according to the video decoding apparatus according to Embodiment 2 of the present invention, when decoding the video elementary stream 18 extracted by the system decoder 12, a start after a picture start code is performed. A code error correction additional code is inserted, and a determination is made as to whether 4-byte data following the picture start code, including the start code error correction additional code, matches the sequence start code. , The subsequent data is processed as the sequence layer of the fragment VOBU 16 input next, so that the pseudo-picture start code is formed by combining the data at the end of the fragment VOBU 16 and the data at the head of the next fragment VOBU 16 However, it detects the start code of the next fragment VOBU16 exactly. I included in the fragment VOBU16
This has the effect that the picture can be decoded.

Embodiment 3 FIG. 8 is a flowchart showing the operation procedure of the system decoder of the video decoding apparatus according to Embodiment 3 of the present invention. Hereinafter, the operation of the system decoder will be described according to the flow of FIG. 2, the same reference numerals as those in FIG. 2 denote the same or corresponding parts, and the operation flow of the first embodiment of the present invention is applied to steps other than Steps S2208 and S2210.
The system decoder 12 outputs each parameter information to the parameter memory 13 every time a start code of a pack, a system or a packet is detected in steps S201 to S207.

Next, when the last end of the fragment VOBU 16 input from the transfer apparatus 11 is detected in step S2208, the process proceeds to step S2210, where the fragment VOBU 16 is detected.
Immediately after this, an additional code for start code error correction composed of 1-byte data “00” and sequence end code “000001B7” is output to the video bit buffer 14.

FIG. 9 is a flowchart showing an operation procedure of the video decoder of the video decoding apparatus according to the third embodiment of the present invention. Hereinafter, the operation of the video decoder will be described according to the flow of FIG. In the figure, FIG.
Are the same or corresponding parts, and step
306, step S2307, and step S2311
Otherwise, the operation flow of the first embodiment of the present invention is applied. When detecting the sequence start code or the group start code from the elementary stream 18 in steps S301 to S305, the video decoder 15 outputs each parameter information to the parameter memory 13.

In step S2306, it is determined whether or not a sequence end code has been detected. If a sequence end code has been detected, the process proceeds to step S302, and data is continuously read out until a sequence start code is detected. If a picture start code is detected in step S2306, the process proceeds to step S230.
Go to 7.

In step S2307, step S23
It is determined whether the 4-byte data immediately following the picture start code detected in step 06 matches the sequence end code. If they match, the process proceeds to step S302.

In step S309, it is determined whether or not the data following the picture start code is an I picture. . If it is determined in step S309 that the picture is not an I-picture, the next sequence end code,
Input data is discarded until either the group start code or the picture start code is detected.

Next, in step S2311, when any one of the sequence end code, group start code, and picture start code is detected, step S302, step S305, or step S305, respectively.
The process moves to 2307.

FIG. 10 is a diagram for explaining an improvement in high-speed reproduction or high-speed reverse reproduction of video data realized by the video decoding apparatus according to the third embodiment of the present invention. As shown in the figure, when a fragment VOBU1 601 terminated with a start code prefix 604 of a certain start code is transferred from the transfer device 11 to the system decoder 12, the system decoder 12 transmits the fragment VOBU1 60
After the start code prefix 604 of 1
Byte data “00” and sequence end code “0”
A pseudo picture start code 607 is formed by inserting the start code prefix 604 and the one byte data “00” at the head of the start code error correction additional code 605 to insert the start code error correction additional code 605 composed of “00001B7” 608. .

When the video elementary stream 18 including the pseudo picture start code 607 is input to the video decoder 15, the video decoder 15 outputs the pseudo picture start code 607 that should not be detected.
, But then the sequence end code 608
, And a sequence start code 606 of the fragment VOBU2 603 is detected, and decoding processing of a subsequent I picture is performed. As described above, the I picture of the fragment VOBU2 603 which has not been decoded in the past is decoded by the video decoder 15 and displayed on the display as the video data 19.

As described above, according to the video decoding apparatus according to Embodiment 3 of the present invention, when the video elementary stream 18 is separated and extracted from the fragment VOBU 16,
After the end of the fragment VOBU16, "00" of 1-byte data and the sequence end code "000001B"
When decoding the video elementary stream 18 by inserting a start code error correction additional code consisting of 7 "and determining whether 4-byte data following the picture start code matches the sequence end code, If they match, the subsequent data is processed as the sequence layer of the fragment VOBU 16 input next, so that the data at the end of the fragment VOBU 16 and the next fragment VOBU 16
Even if a pseudo picture start code is formed by combining the leading data of
The start code of OBU16 is detected and the fragment VOBU is detected.
This has the effect that the I-picture included in No. 16 can be decoded.

[0076]

As described above, according to the video decoding method according to the first aspect of the present invention, the video decoding method according to the first aspect provides an I-picture in which video data is intra-coded, A P-picture obtained by forward prediction coding using a correlation with a previous frame, and a bi-directional prediction coding using correlation with a temporally preceding frame, a succeeding frame, or both preceding and succeeding frames. From a series of data streams in which encoded video data composed of B pictures, encoded audio data obtained by encoding audio data, and additional information related to the encoded video data and encoded audio data are multiplexed. A video decoding method for separating and extracting the video coded data, decoding only the I picture therein, and performing high-speed reproduction or high-speed reverse reproduction of the video,
Separating and extracting, from the data stream, partial fragment data including an I picture for each predetermined unit;
When the video encoded data is separated and extracted from the fragment data, a start code erroneous correction consisting of the first byte data of the start code of the fragment data is added after the start code of the I picture, P picture or B picture. Inserting a code and decoding the encoded video data separated and extracted from the fragment data, the data subsequent to the start code of the I picture, P picture or B picture is the start code of the fragment data. Determining whether they match, and if they match, decoding the I-picture included in the next fragment data, wherein the data at the end of the fragment data and the data at the head of the next fragment data are By combining them, even if a pseudo picture start code is formed, the start of the next fragment data can be accurately performed. Detecting the Tokodo, that since characterized in, regardless of the cutting position of the fragment data,
This has the effect that I pictures included in all fragment data can be decoded.

According to the video decoding method of the second aspect,
2. The video decoding method according to claim 1, wherein the predetermined unit is a VOBU unit defined by a DVD video standard, and the start code error correction additional code is "0".
0 ”, so the fragment VO
There is an effect that I pictures included in all the fragment VOBUs can be decoded regardless of the cutting position of the BU.

According to the video decoding apparatus of the third aspect,
I-picture in which video data is intra-coded, P-picture obtained by forward prediction coding using a correlation with a temporally previous frame, temporally preceding or succeeding frame, or both preceding and succeeding frames With respect to video coded data composed of B pictures obtained by bidirectional predictive coding utilizing correlation with audio data, voice coded data obtained by coding voice data, and the video coded data and voice coded data. A video decoding device that separates and extracts the video coded data from a series of data streams multiplexed with additional information, decodes only the I-pictures therein, and performs high-speed playback or high-speed reverse playback of the video. A fragment data extracting means for separating and extracting partial fragment data including an I picture in a predetermined unit from a series of input data streams; When the video coded data and its additional information are separated and extracted from the fragment data sent from the fragment data extracting means, and the start code of the I picture, P picture, or B picture is detected. Is separated and extracted by the video encoded data extracting means for inserting a start code error correcting additional code consisting of the first one byte data of the fragment data start code after the start code, and the video encoded data extracting means. Video coded data storage means for temporarily storing the coded video data, additional information storage means for temporarily storing additional information of the video coded data separated and extracted by the video coded data extraction means, From the video coded data input from the data storage means,
When a start code of a picture, a P picture, or a B picture is detected, it is determined whether data following the start code matches the start code of the fragment data. Video encoded data decoding means for decoding an I picture to be decoded, and a pseudo picture start code is formed by combining data at the end of the fragment data with data at the head of the next fragment data. However, since the start code of the next fragment data is accurately detected, it is possible to decode I pictures included in all fragment data regardless of the cutting position of the fragment data. Has an effect that can be.

According to the video decoding apparatus of the fourth aspect,
4. The video decoding apparatus according to claim 3, wherein the predetermined unit is a VOBU unit defined by a DVD video standard, and the start code error correction additional code is “0”.
0 ”, so the fragment VO
There is an effect that I pictures included in all the fragment VOBUs can be decoded regardless of the cutting position of the BU.

According to the video decoding method of claim 5,
I-picture in which video data is intra-coded, P-picture obtained by forward prediction coding using a correlation with a temporally previous frame, temporally preceding or succeeding frame, or both preceding and succeeding frames With respect to video coded data composed of B pictures obtained by bidirectional predictive coding utilizing correlation with audio data, voice coded data obtained by coding voice data, and the video coded data and voice coded data. This video decoding method separates and extracts the video encoded data from a series of data streams in which additional information is multiplexed, decodes only the I-pictures in the data, and performs high-speed playback or high-speed reverse playback of the video. Separating and extracting partial fragment data including an I picture from the data stream in predetermined units; Separating the encoded data, and decoding the encoded video data separated and extracted from the fragment data, after the start code of the I picture, P picture, or B picture, Insert a start code error correction additional code consisting of the first byte data of the start code, and determine whether the data following the start code of the picture data matches the start code of the fragment data. Is the I contained in the next fragment data
Decoding the picture, and combining the data at the end of the fragment data with the data at the head of the next fragment data to form the next fragment data accurately even if a pseudo picture start code is formed. This is characterized in that the I-picture included in all the fragment data can be decoded regardless of the cutting position of the fragment data.

According to the video decoding method of claim 6,
6. The video decoding method according to claim 5, wherein the predetermined unit is a VOBU unit defined by a DVD video standard, and the start code error correction additional code is "0".
0 ”, so the fragment VO
There is an effect that I pictures included in all the fragment VOBUs can be decoded regardless of the cutting position of the BU.

According to the video decoding apparatus of claim 7,
I-picture in which video data is intra-coded, P-picture obtained by forward prediction coding using a correlation with a temporally previous frame, temporally preceding or succeeding frame, or both preceding and succeeding frames With respect to video coded data composed of B pictures obtained by bidirectional predictive coding utilizing correlation with audio data, voice coded data obtained by coding voice data, and the video coded data and voice coded data. A video decoding device that separates and extracts the video coded data from a series of data streams multiplexed with additional information, decodes only the I-pictures therein, and performs high-speed playback or high-speed reverse playback of the video. A fragment data extracting means for separating and extracting partial fragment data including an I picture in a predetermined unit from a series of input data streams; A video coded data extracting means for extracting separate video encoded data and the additional information from the fragment data sent from the fragment data extracting means,
Video encoded data storage means for temporarily storing the video encoded data separated and extracted by the video encoded data extracting means, and additional information of the video encoded data separated and extracted by the video encoded data extracting means. When the start code of the I picture, P picture or B picture is detected from the encoded video data input from the encoded video data storage means, A start code error correction additional code consisting of the first byte data of the start code of the fragment data is inserted, and it is determined whether the data following the picture start code matches the start code of the fragment data. To decode the I-picture included in the next fragment data. Stage, and the start code of the next fragment data is accurately detected even when a pseudo picture start code is formed by combining the data at the end of the fragment data with the data at the head of the next fragment data. Therefore, there is an effect that the I picture included in all the fragment data can be decoded regardless of the cutting position of the fragment data.

According to the video decoding apparatus of claim 8,
8. The video decoding device according to claim 7, wherein the predetermined unit is a VOBU unit defined by a DVD video standard, and the start code error correction additional code is "0".
0 ”, so the fragment VO
There is an effect that I pictures included in all the fragment VOBUs can be decoded regardless of the cutting position of the BU.

According to the video decoding method of the ninth aspect,
I-picture in which video data is intra-coded, P-picture obtained by forward prediction coding using a correlation with a temporally previous frame, temporally preceding or succeeding frame, or both preceding and succeeding frames With respect to video coded data composed of B pictures obtained by bidirectional predictive coding utilizing correlation with audio data, voice coded data obtained by coding voice data, and the video coded data and voice coded data. The video encoded data is separated and extracted from a series of data streams in which additional information is multiplexed, and the video encoded data is separated and extracted. Separating and extracting, from the data stream, partial fragment data including an I picture for each predetermined unit; When extracting the encoded video data, the last one byte of the picture start code and the end of the encoded video data are inserted between the encoded video data of the fragment data and the encoded video data of the next fragment data. Inserting a start code error correction additional code consisting of a code, and, when decoding the video coded data, the data following the start code of the I picture, P picture, or B picture is the end of the fragment data. Decoding the I-picture included in the next fragment data if the code is coincident with the first fragment data, and decoding the I-picture included in the next fragment data. Even if the pseudo-picture start code is formed by combining the data, the start code of the next fragment data can be accurately calculated. Detecting the so is characterized in that, regardless of the cutting position of the fragment data, has an advantage of being able to process decoded the I pictures included in all fragmented data.

According to a tenth aspect of the present invention, in the video decoding method of the ninth aspect, the predetermined unit is a VOBU unit defined by a DVD video standard, The additional code is
Since it is characterized by being "00000001B7", there is an effect that I pictures included in all the fragment VOBUs can be decoded regardless of the cutting position of the fragment VOBU.

According to the video decoding apparatus of the present invention, an I picture in which video data is intra-coded, a P picture obtained by forward prediction coding using a correlation with a temporally previous frame. Video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with a temporally preceding frame, a subsequent frame, or both preceding and succeeding frames, and audio obtained by encoding audio data The video encoded data is separated and extracted from a series of data streams in which the encoded data and the additional information regarding the video encoded data and the audio encoded data are multiplexed, and only the I picture in the extracted data is decoded. A video decoding device that performs high-speed playback or high-speed reverse playback of video,
A fragment data extracting means for separating and extracting partial fragment data including an I picture in a predetermined unit from a series of input data streams; and a video encoding means for encoding a fragment data sent from the fragment data extracting means. The data and its additional information are separated and extracted. At this time, if the end of the fragment data is detected, the last one-byte data of the start code of the picture and the video encoded data are added after the end of the fragment data. Video coded data extraction means for inserting a start code error correction additional code consisting of an end code, and video coded data storage means for temporarily storing video coded data separated and extracted by the video coded data extraction means. Additional information for temporarily storing additional information of video encoded data separated and extracted by the video encoded data extracting means. And product means, from the image coded data input from the image coded data storage unit, the I-picture, upon detecting a start code of the P-picture or B-picture, data subsequent to the start code,
Determining whether the end code matches the end code of the video encoded data, and if the end code is coincident with the end code, video decoding data decoding means for decoding an I picture included in the next fragment data; Even if a pseudo picture start code is formed by combining the data at the end and the data at the head of the next fragment data, the start code of the next fragment data is accurately detected. Therefore, there is an effect that I pictures included in all fragment data can be decoded regardless of the cutting position of the fragment data.

According to a twelfth aspect of the present invention, in the video decoding apparatus according to the eleventh aspect, the predetermined unit is a VOBU defined by a DVD video standard.
Since the additional code for start code error correction is "00000001B7", the I-picture included in all the fragment VOBUs is decoded regardless of the cutting position of the fragment VOBU. Has the effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a video decoding device according to Embodiment 1, 2, or 3 of the present invention.

FIG. 2 is a flowchart showing an operation procedure of a system decoder of the video decoding device according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing an operation procedure of a video decoder of the video decoding device according to the first embodiment of the present invention.

FIG. 4 is a data diagram of a video elementary stream created by the video decoding device according to the first embodiment of the present invention.

FIG. 5 is a diagram for describing improvements in high-speed playback or high-speed reverse playback of video data realized by the video decoding device according to the first or second embodiment of the present invention.

FIG. 6 is a flowchart showing an operation procedure of a system decoder of the video decoding device according to the second embodiment of the present invention.

FIG. 7 is a flowchart showing an operation procedure of a video decoder of the video decoding device according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing an operation procedure of a system decoder of the video decoding device according to the third embodiment of the present invention.

FIG. 9 is a flowchart showing an operation procedure of a video decoder of the video decoding device according to the third embodiment of the present invention.

FIG. 10 is a diagram for describing an improvement in high-speed reproduction or high-speed reverse reproduction of video data realized by the video decoding device according to the third embodiment of the present invention.

FIG. 11 is a data diagram of a program stream of the MPEG standard.

FIG. 12 is a data diagram of a video elementary stream in a program stream of the MPEG standard.

FIG. 13 shows a VOBU defined by the DVD video standard
FIG.

FIG. 14 is a block diagram illustrating a configuration of a conventional video decoding device.

FIG. 15 is a data diagram of a picture layer of video encoded data for describing an operation procedure of decoding video encoded data by a conventional video decoding device.

FIG. 16 is a diagram illustrating a defective state of high-speed reproduction or high-speed reverse reproduction of video data by a conventional video decoding device.

[Explanation of symbols]

10,950 Program stream 11,951 Transfer device 12,952 System decoder 13,953 Parameter memory 14,954 Video bit buffer 15,955 Video decoder 16,956 Fragment VOBU 17,957 Parameter information 18,958 Video elementary stream 19, 959 Video data 400, 402 Video elementary stream 401 Picture start code 403, 507, 605 Start code erroneous correction additional code 501, 503, 601, 603, 1002, 110
1, 1103 Fragment VOBU 502, 602, 1102 Fragment VOBU junction point 504, 604, 1104 Start code prefix 505, 508, 606, 1105 Sequence start code 506, 607, 1106 Pseudo picture start code 608 Sequence end code 701, 901 Program stream 702 pack 703 pack header 704, 906 system header 705 packet 706 program end code 707 pack start code 708, 710, 712 parameter information 709 system header start code 711 packet start code 713 elementary stream 801 video elementary stream 802 sequence layer 803 group Of picture layer 804 picture layer 05 Slice layer 806 Macro block layer 807 Block layer 808, 1003 Sequence header 809, 907 GOP 810 Sequence end 811, 1004 GOP header 812 Picture 813 Picture header 814 Picture data 902, 1001 VOBU 903, 905 Video pack 904 Audio pack 1005 I picture 1006 B picture 1007 P picture

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Totora Soda, 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C053 FA24 GB15 GB37 HA24 HA25 KA05 5C059 KK36 MA00 MA05 MA14 PP05 PP06 PP07 RB02 RC24 RC32 RF05 SS13 SS30 TA00 TC00 TD11 UA05 UA34 UA38 5D044 AB05 AB07 BC03 DE49 DE68 EF05 FG24 GK07

Claims (12)

[Claims] 1. An I-picture in which video data is intra-coded, a P-picture obtained by forward prediction coding using a correlation with a temporally previous frame, a temporally previous or subsequent frame Or, video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with both front and rear frames, audio encoded data obtained by encoding audio data, and the video encoded data The video coded data is separated and extracted from a series of data streams multiplexed with the additional information related to the audio coded data, and only the I picture in the coded data is decoded to perform high-speed reproduction or high-speed reverse reproduction of the video. A decoding method, comprising: extracting, from the data stream, partial fragment data including an I picture for each predetermined unit; When separating and extracting video encoded data from one piece of data, a start code erroneous correction additional code consisting of the first byte data of the start code of the fragment data is added after the start code of the I picture, P picture, or B picture. And when decoding the encoded video data separated and extracted from the fragment data, the data following the start code of the I picture, P picture, or B picture matches the start code of the fragment data. Decoding the I-picture included in the next fragment data if they match, and combining the data at the end of the fragment data with the data at the head of the next fragment data. By doing so, even if a pseudo picture start code is formed, the start of the next fragment data A video decoding method, comprising: detecting a code. 2. The video decoding method according to claim 1, wherein the predetermined unit is a video signal defined by a DVD video standard.
A video decoding method in OBU units, wherein the start code error correction additional code is "00". 3. An I picture in which video data is intra-coded, a P picture obtained by forward prediction coding using a correlation with a temporally previous frame, a temporally previous frame or a temporally subsequent frame Or, video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with both front and rear frames, audio encoded data obtained by encoding audio data, and the video encoded data The video coded data is separated and extracted from a series of data streams multiplexed with the additional information related to the audio coded data, and only the I picture in the coded data is decoded to perform high-speed reproduction or high-speed reverse reproduction of the video. What is claimed is: 1. A decoding apparatus, comprising: a fragment for separating and extracting partial fragment data including an I picture for each predetermined unit from a series of input data streams; Data extraction means, and the video encoded data and its additional information are separated and extracted from the fragment data sent from the fragment data extraction means, and the I picture, P picture, or B picture When a start code is detected, video encoded data extracting means for inserting, after the start code, an additional code for start code erroneous correction consisting of the first one byte of the start code of the fragment data; Video coded data storage means for temporarily storing video coded data separated and extracted by the extraction means, and additional information storage means for temporarily storing additional information of the video coded data separated and extracted by the video coded data extraction means From the video coded data input from the video coded data storage means, , Or B
When the start code of the picture is detected, it is determined whether or not the data following the start code matches the start code of the fragment data. If the data matches, the I-picture included in the next fragment data is decoded. Video coded data decoding means, and even when a pseudo picture start code is formed by combining the data at the end of the fragment data and the data at the head of the next fragment data, A video decoding device for detecting a start code of data. 4. The video decoding apparatus according to claim 3, wherein the predetermined unit is a video signal defined by a DVD video standard.
A video decoding apparatus in OBU units, wherein the additional code for start code error correction is “00”. 5. An I picture in which video data is intra-coded, a P picture obtained by forward prediction coding using a correlation with a temporally previous frame, a temporally previous frame or a subsequent frame Or, video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with both front and rear frames, audio encoded data obtained by encoding audio data, and the video encoded data and The video encoded data is separated and extracted from a series of data streams in which additional information relating to audio encoded data is multiplexed, and only the I picture therein is decoded to perform high-speed reproduction or high-speed reverse reproduction of the video. A decoding method, comprising: extracting, from the data stream, partial fragment data including an I picture for each predetermined unit; Separating and extracting video encoded data from one piece of data; and decoding the video encoded data separated and extracted from the fragment data, after the start code of the I picture, P picture or B picture. A start code error correction additional code consisting of the first byte data of the start code of the fragment data is inserted, and it is further determined whether data following the start code of the picture data matches the start code of the fragment data. Decoding the I-picture included in the next fragment data if they match, and combining the data at the end of the fragment data with the data at the beginning of the next fragment data to form a pseudo picture start. Even if a code is formed, the start code of the next fragment data is detected accurately. Video decoding method comprising. 6. The video decoding method according to claim 5, wherein said predetermined unit is V defined by a DVD video standard.
A video decoding method in OBU units, wherein the start code error correction additional code is "00". 7. An I-picture in which video data is intra-coded, a P-picture obtained by forward predictive coding utilizing a correlation with a temporally previous frame, a temporally previous or subsequent frame Or, video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with both front and rear frames, audio encoded data obtained by encoding audio data, and the video encoded data and The video encoded data is separated and extracted from a series of data streams in which additional information relating to audio encoded data is multiplexed, and only the I picture therein is decoded to perform high-speed reproduction or high-speed reverse reproduction of the video. What is claimed is: 1. A decoding apparatus, comprising: Data extraction means; video coded data extraction means for separating and extracting video coded data and its additional information from the fragment data sent from the fragment data extraction means; Video coded data storage means for temporarily storing the extracted video coded data; additional information storage means for temporarily storing additional information of the video coded data separated and extracted by the video coded data extraction means; From the coded video data input from the coded data storage means, the I picture, P picture, or B
When the start code of the picture is detected, a start code error correction additional code consisting of the first byte data of the start code of the fragment data is inserted after the start code. Determines whether the start code of the fragment data matches the start code. If the start code of the fragment data matches, a video coded data decoding means for decoding an I picture included in the next fragment data is provided. Video data decoding apparatus that accurately detects the start code of the next fragment data even when a pseudo picture start code is formed by combining the data of the first fragment data and the first data of the next fragment data. . 8. The video decoding apparatus according to claim 7, wherein the predetermined unit is a video signal defined by a DVD video standard.
A video decoding apparatus in OBU units, wherein the additional code for start code error correction is “00”. 9. An I picture in which video data is intra-coded, a P picture obtained by forward prediction coding using a correlation with a temporally previous frame, a temporally previous frame or a subsequent frame Or, video encoded data composed of B pictures obtained by bidirectional predictive encoding using correlation with both front and rear frames, audio encoded data obtained by encoding audio data, and the video encoded data The video coded data is separated and extracted from a series of data streams multiplexed with the additional information related to the audio coded data, and only the I picture in the coded data is decoded to perform high-speed reproduction or high-speed reverse reproduction of the video. A high-speed decoding method, comprising: extracting, from the data stream, partial fragment data including an I picture for each predetermined unit; From serial fragment data when extracting the video encoded data,
Between the video encoded data of the fragment data and the video encoded data of the next fragment data, a start code erroneous correction additional code including the last one byte data of the picture start code and the end code of the video encoded data And determining whether or not data following the start code of the I picture, P picture, or B picture matches the end code of the fragment data when decoding the video encoded data. Decoding the I-picture included in the next fragment data if they match, and combining the data at the end of the fragment data with the data at the beginning of the next fragment data to form a pseudo picture start. Even if a code is formed, the start code of the next fragment data is accurately detected. Decoding method. 10. The video decoding method according to claim 9, wherein said predetermined unit is V defined by a DVD video standard.
The start code error correction additional code is “0000” in OBU units.
0001B7 ”. 11. An I-frame in which video data is coded in a frame.
Picture, P picture obtained by forward prediction coding using correlation with temporally previous frame, bidirectional prediction using correlation with temporally previous frame, subsequent frame, or both preceding and succeeding frames A series of multiplexed video encoded data composed of B pictures obtained by encoding, audio encoded data obtained by encoding audio data, and additional information relating to the video encoded data and audio encoded data. A video decoding device that separates and extracts the video coded data from the data stream, decodes only the I picture in the video stream, and performs high-speed playback or high-speed reverse playback of the video. A fragment data extracting means for separating and extracting partial fragment data including an I picture for each predetermined unit; Is video encoded data and the additional information from the fragment data come separated and extracted, this time, if it detects the end of the fragment data,
Video encoded data extraction means for inserting, after the end of the fragment data, a start code error correcting additional code consisting of the last one byte data of the picture start code and the end code of the video encoded data; A video encoded data storage unit for temporarily storing video encoded data separated and extracted by the video encoded data extraction unit; and temporarily stores additional information of the video encoded data separated and extracted by the video encoded data extraction unit. An additional information storage unit, and from the video encoded data input from the video encoded data storage unit, the I picture, P picture, or B
When the start code of the picture is detected, it is determined whether the data following the start code matches the end code of the video encoded data. If the data matches, the I picture included in the next fragment data is determined. Video decoding data decoding means for decoding, even if a pseudo picture start code is formed by combining the data at the end of the fragment data and the data at the head of the next fragment data, A video decoding device for detecting a start code of the next fragment data. 12. The video decoding apparatus according to claim 11, wherein the predetermined unit is V defined by a DVD video standard.
The start code error correction additional code is “0000” in OBU units.
0001B7 ”.