JP2006202353A - Reproduction device having corrective function of management information of mpeg2 transport stream - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct the management information so as to agree with AV data when an attribute of actual AV data is different from an attribute held by the managing information, in an MPEG transport stream recorded in a Blu-ray Disc ReWritable Format. <P>SOLUTION: When the MPEG2 transport stream recorded on the Blu-ray Disc ReWritable Format is decoded and reproduced, the result of this decoding is compared with the management information of the stream stored in an accumulating section, and when the management information is different from the result of decoding, the recording is carried out again after a part of the management information is corrected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for recording / reproducing an MPEG2 transport stream recorded in a Blu-ray Disc ReWritable Format.

  In recent years, recording / playback apparatuses using a large-capacity hard disk drive and an optical disk Blu-Ray Disc have been developed. In the Blu-Ray Disc, which is adopted as a data recording standard in the Blu-Ray Disc, the stream data that is the main body of the recorded stream and clip information data that holds the information of the stream are described. Is stipulated.

  This clip information data includes all the video and audio attributes (video format, resolution, aspect ratio, audio format, number of audio channels) included in the stream data, called stream coding information for each video and audio of the stream data. The described descriptor is stored so that the attribute information of the stream data can be known without decoding the stream data. This stream coding information is included in the program information descriptor in the clip information.

  In normal stream data playback, this management information is not used, but decoding is performed according to the MPEG data format, output devices such as a display are set from the decoding result, and video and audio are played back. However, this may cause problems such as it takes time to start playback and the head part cannot be played back correctly. For this reason, before starting decoding, it is common to read out attribute information necessary for output from the management information portion in advance and make appropriate settings in the output device (see Patent Document 1).

In addition, some of these digital recorders have functions such as displaying recorded program information without playing them, in which case the attribute information in the recorded stream coding information is read out, Used for display.
JP 2002-251830 A

  However, in this Blu-ray Disc Rewritable Format, attribute information (video format, resolution, aspect ratio, audio format, number of audio channels) described in the clip information data and a predetermined area defined in the MPEG format ( Match the video format / resolution / aspect ratio information described in the sequence header), the audio format (linear PCM / AC-3 / DTS / AAC), and the content of the number of audio channels in each format. It is not stipulated that the attribute information inherent to the stream data is not written in the stream coding information part of the clip information when data is created or when the wrong data is intentionally created. A situation will occur .

  When playing back data that does not match the stream information and clip information, the video output device and audio output device must be set according to the clip information before decoding the stream data. The problem that cannot be obtained occurs.

  Further, when displaying and notifying the attribute information of the stream to the user, if the display is performed with reference to only the clip information without decoding, there is a problem that wrong information is displayed.

  The present invention relates to video and audio data recorded in a recording format having video information compressed video data, audio information compressed audio data, and clip information including video / audio attribute information. Is to be corrected.

  In the management information of the AV data body called sequence header in the MPEG stream data, it is stipulated that the correct value is stored according to the standard. Therefore, when decoding is correctly completed at the time of AV data decoding, from the result of decoding. The obtained attribute information is compared with the attribute information included in the clip information. If the clip information is different from the decoding result, it is understood that the management information part is wrong. At this time. If the management information part is corrected and recorded in the storage unit, the correct management information can be obtained without performing decoding again at the next and subsequent reproductions.

  If decoding cannot be completed correctly, the information in the sequence header may not be correct, so the attribute information in the clip information is not corrected.

  Even in a stream with incorrect management information, correct attribute information can be obtained before decoding at the second and subsequent decoding so that the output device before decoding can be set correctly. Become.

  Even in a stream having wrong management information, after decoding once, correct information can be displayed without decoding when displaying attribute information of the stream. .

  In addition, when two or more stream data attribute information obtained in advance is the same, it is possible to prevent malfunctions in seamless playback in which continuous decoding is performed and playback is performed as a continuous stream. .

  FIG. 1 is a system configuration diagram of an MPEG2 transport stream playback apparatus. Arrows indicate the flow of data.

  The reproducing apparatus according to the present invention includes an accumulator 10 for recording an MPEG2 transport stream, AV data and management information of the stored MPEG transport stream, and an AV / audio output apparatus for A reproduction control unit 20 that performs output setting in advance before decoding data, a decoder control unit 30 that decodes AV data transferred by the reproduction control unit, and notifies the reproduction control unit of the decoding result, and an attribute information output unit 40 And a video output unit 50 that outputs a video signal through a display and a video terminal, and an audio output unit 60 that outputs an audio signal through a speaker and an audio terminal.

  An outline of the operation of such a playback apparatus will be described with reference to FIG. FIG. 5 is a flowchart showing an outline of the operation of the playback apparatus of the present invention. AV data is read from the storage unit into the memory (S50), and the AV data is decoded (S51). Then, it is determined whether or not the decoding result matches the management information stored in the storage unit (S52). If they do not match, the management information is corrected based on the decoding result, stored in the storage unit, and the process ends. (S53).

  Further detailed operation will be described with reference to FIGS. 2 to 4 are diagrams showing a flow from data reading to decoding and management information correction.

  The reproduction control unit 20 reads the AV data portion and clip information portion of the MPEG transport stream recorded on the recording medium of the storage device 10 onto a memory (not shown) (S10), and the AV data portion is the decoder control portion 30. (S11), and a decode instruction is issued. The clip information portion is clip information data in the Blu-ray Disc Rewritable Format, which is called stream coding information for each video and audio of the stream data, and all video and audio AV attributes (video format / resolution) included in the stream data. A descriptor describing aspect ratio, audio format, and number of audio channels) is stored, so that attribute information of stream data can be known without decoding the stream data. This stream coding information is included in the program information descriptor in the clip information.

  The decoder control unit 30 decodes the AV data transferred from the reproduction control unit 20 (S12), outputs it to the video output unit and the audio output unit, and notifies the reproduction control unit 20 of the decoding result. When there is a request for attribute display, the attribute information display unit 40 acquires management information through the reproduction control unit 20 and displays the management information on the video output unit 50 or outputs it to the audio output unit 60.

  The decoder control unit 30 decodes the AV data transferred from the reproduction control unit 20, and when the decoding is successful, attribute information (video format, resolution, aspect ratio, audio format, number of audio channels) is obtained from the decoding result. ) Is notified to the playback control unit 20 when the decoding of the AV data is completed (S14). If the decoding could not be completed correctly, a notification that the decoding could not be completed correctly is sent (S15).

  The playback control unit 20 receives management information associated with the AV data transferred to the decoder control unit 30 and attribute information (video format, resolution, aspect ratio, audio format, number of audio channels) of the decoding result from the decoder control unit 30. When there is a difference, the clip information is corrected with respect to the attribute information portion having the difference on the memory.

  Specifically, it is determined whether or not the video format is the same as the clip information (S21). If the video format is not the same, the video format in the management information section is corrected to the decoding result (S22). Similarly, it is determined whether the resolution, aspect ratio, audio format, and number of audio channels are the same as the clip information (S23, S25, S27, S29). If they are not the same, the resolution, aspect ratio, audio of the management information section is determined. The format and the number of audio channels are corrected to the decoding result (S24, S26, S28, S30).

  When the clip information is corrected in the memory, when the clip information is discarded from the memory, the clip information recorded in the storage unit is written back and recorded in the storage part. S41).

  As a result, it is possible to correct the AV data and the attribute information of the clip information so that the attribute information is consistent during the next reproduction.

  Not only an MPEG transport stream in Blu-Ray ReWritable Format, but also a system for recording / reproducing video / audio data in which actual data and management information are separated and inconsistency is recognized to occur. Can also be applied.

Block diagram of the playback apparatus of the present invention Flow chart showing the operation from data reading to decoding result acquisition Flowchart of comparison operation between decoding result and clip information Clip information change flowchart The flowchart which shows the outline | summary of operation | movement of the reproducing | regenerating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Accumulation part 20 Playback control part 30 Decoder control part 40 Attribute information output part 50 Video | video output part 60 Audio | voice output part

Claims (5)

A storage unit for recording management information and AV data;
A decoding unit for decoding the AV data;
A control unit that compares the attribute information of the AV data decoded by the decoding unit with the management information, and records the management information by replacing the management information with the attribute information when the management information is different from the attribute information; Playback device. 2. The playback apparatus according to claim 1, wherein the AV data recorded in the storage unit is an MPEG transport stream, and the attribute information is information included in the MPEG transport stream. The management information includes at least one AV attribute information, and the attribute information includes at least one AV attribute information,
The control unit includes, in the attribute information, AV attribute information included in the management information for AV attribute information different from the AV information included in the attribute information among a plurality of AV attribute information included in the management information. The reproducing apparatus according to claim 1, wherein recording is performed by replacing the AV information. The playback apparatus according to claim 3, wherein the AV attribute information includes at least one of a video format, a resolution, an aspect ratio, an audio format, and the number of audio channels. Read management information and AV data,
Decoding the AV data to extract attribute information;
Comparing the attribute information with the management information;
A reproduction method for recording, when the management information is different from the attribute information, replacing the management information with the attribute information.

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