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Method for synchronizing video with audio in decoding system

A decoder and video signal technology, applied in the field of MPEG-2 decoding system, can solve the problems of impossibility to predetermine, hardware decoder cannot adapt to the rapid development of digital technology, and high cost

Inactive Publication Date: 2003-08-13
CATHAY ROXUS INFORMATION TECH
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Problems solved by technology

[0004] However, the hardware-based decoder has the disadvantage of not being flexible enough. For example, when the decoding system is upgraded and new functions need to be added, the decoder needs to be updated as a whole. Therefore, the hardware-based decoder cannot adapt to the rapid development of digital technology, and The cost is high, therefore, the decoder in the form of software is the trend of future development
However, for the MPEG-2 software decoding system, video decoding and audio decoding run in a real-time operating system in a task mode. Due to the task switching of the software decoding system, the efficiency of software decoding, and the diversity of code streams, etc., It is impossible to predetermine the moment when the decoding module is started, and the moment when each frame of the decoded signal reaches the playback module, and it is difficult to realize the synchronization of video and audio signals according to existing methods

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  • Method for synchronizing video with audio in decoding system
  • Method for synchronizing video with audio in decoding system

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Embodiment Construction

[0020] figure 1 is a schematic diagram of the structure of the data flow of the software decoding system of the present invention. exist figure 1 Among them, the software decoding system includes: transport stream decoder, audio decoder, video decoder, audio player, video player. After the transport stream enters the transport stream decoder, it is divided into two data streams, audio stream and video stream, which enter the audio decoder and video decoder respectively, become audio frames and video frames, and then enter the audio player and video player respectively. The requirement for synchronization is that the audio signal and video signal played from the audio player and video player are synchronized. In addition, since the present invention relates to a software-based decoding system, each of the above-mentioned decoders or players can be considered to be realized by calling corresponding software programs.

[0021] The method of the present invention designs a loca...

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Abstract

A method for synchronizing video signals with audio signals in decoder system is characterized by that the display time label PTS of currently received audio signals and video signals is compared with the local reference clock LCR obtained from program reference clock PCR, and when the absolute value of their difference is lower than a predefined threshold, the received audio signals and video signals are normally played in synchronous mode. For MPEG-2 stream, the audio signals and video signal can be well synchronized.

Description

technical field [0001] The invention relates to an MPEG-2 (Motion Picture Experts Group) decoding system, in particular to a method for synchronizing video signal output and audio signal output in the MPEG-2 software decoding system. Background technique [0002] According to the international standard MPEG-2 for general coding of moving images and their accompanying sound, there are several time stamps in the transport stream (TS-Transport Streaming) of the MPEG-2 decoding system: the time stamp indicating the display time of audio and video is called the display time stamp PTS (Presentation Time Stamps), the time stamp indicating the audio and video decoding time is called decoding time stamp DTS (Decoding Time Stamps), and the program reference clock PCR (Program Clock Reference) indicating the system clock value. According to the MPEG-2 standard, in the TS stream, at least 10 PCRs, 10 audio presentation time stamps PTS and 10 video presentation time stamps PTS should be ...

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Application Information

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IPC IPC(8): H04N7/24
Inventor 张小喜
Owner CATHAY ROXUS INFORMATION TECH
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