Method and device for multi-thread video and audio synchronous control

A technology of audio and video synchronization and control method, which is applied in the field of digital audio and video, can solve the problems of not considering the uncertainty of image and sound content, the difficulty and trouble of dividing video and audio, and achieve a clear software structure and reduce the use of system resources , to achieve the effect of low complexity
CN101984672AInactive Publication Date: 2011-03-09SHENZHEN CHIPSBANK TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN CHIPSBANK TECH
Publication Date
2011-03-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method and a device for multi-thread video and audio synchronous control. The method comprises the following steps of: splitting transport stream or program stream into audio basic steam, video basic stream and respective time information; acquiring audio data and image data to be output by decoding; selecting the audio data and the image data to be output in accordance with the local system clock requirement according to the time information for outputting respectively, and selecting the audio data and the image data, the time information of which is closest to the local system clock value; calculating the difference between the corresponding time of the audio data and the corresponding time of the image data; and when the corresponding time of the video data is greater than the corresponding time of the audio data, repeatedly outputting the video data for displaying, otherwise, skipping the video play of the video data and performing frame kipping processing so as to synchronously output the audio and the video. The method and the device do not need to supplement a large amount of video coding data and audio image data so as to greatly reduce the utilization of the system resources.
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Description

technical field

[0001] The invention relates to the technical field of digital audio and video, in particular to a multi-threaded audio and video synchronization control method and device. Background technique

[0002] Currently popular video codec standards, such as MPEG-1, MPEG-2, MPEG-4, H.26x, etc., all adopt the traditional hybrid coding structure, which uses time and space prediction, transformation, quantization and entropy coding methods , encode video frames into different frame types: intra-frame prediction frame (I frame), inter-frame prediction frame (P frame) and bi-directional prediction frame (B frame), which will inevitably cause video decoding speed to vary due to video content Different, but the playback frame rate of the video is fixed, which leads to problems such as the mismatch between the video decoding speed and the display speed, and the audio and video are encoded and transmitted separately, and synchronous output is required during playback. If it ...

Claims

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