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Linshizhi
ffmpeg.wasm-core
Commits
f58b8cc3
Commit
f58b8cc3
authored
Feb 27, 2012
by
Anton Khirnov
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lavf doxy: add some basic documentation about reading from the demuxer.
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avformat.h
libavformat/avformat.h
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libavformat/avformat.h
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f58b8cc3
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@@ -145,6 +145,22 @@
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@@ -145,6 +145,22 @@
* avformat_close_input(). It will free everything associated with the file.
* avformat_close_input(). It will free everything associated with the file.
*
*
* @section lavf_decoding_read Reading from an opened file
* @section lavf_decoding_read Reading from an opened file
* Reading data from an opened AVFormatContext is done by repeatedly calling
* av_read_frame() on it. Each call, if successful, will return an AVPacket
* containing encoded data for one AVStream, identified by
* AVPacket.stream_index. This packet may be passed straight into the libavcodec
* decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
* avcodec_decode_subtitle2() if the caller wishes to decode the data.
*
* AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
* set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
* pts/dts, 0 for duration) if the stream does not provide them. The timing
* information will be in AVStream.time_base units, i.e. it has to be
* multiplied by the timebase to convert them to seconds.
*
* The packet data belongs to the demuxer and is invalid after the next call to
* av_read_frame(). The user must free the packet with av_free_packet() before
* calling av_read_frame() again or closing the file.
*
*
* @section lavf_decoding_seek Seeking
* @section lavf_decoding_seek Seeking
* @}
* @}
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