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42 lines
2.5 KiB
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42 lines
2.5 KiB
ReStructuredText
.. meta::
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:description: rocDecode FFMpeg utility decoder
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:keywords: decode, video decoder, video decoding, ffmpeg, rocDecode, utility functions, AMD, ROCm
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***********************************************
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The rocDecode FFMpeg decoder utility class
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***********************************************
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The rocDecode FFMpeg decoder utility class, `FFMpegVideoDecoder <https://github.com/ROCm/rocm-systems/tree/develop/projects/rocdecode/utils/ffmpegvideodecode/ffmpeg_video_dec.h>`_, is used to decode demultiplexed (demuxed) frames on the CPU.
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FFMpegVideoDecoder uses the FFMpeg video decoding backend to decode frame packets output by the FFMpeg demultiplexer (demuxer). It inherits from :doc:`the RocVideoDecode utility class <./rocDecode-util-decoder>` and uses many of the same functions.
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The ``FFMpegVideoDecoder()`` constructor takes the same parameters as ``RocVideoDecoder`` except for the first parameter, which is the number of CPU threads rather than the device ID, and the force zero latency parameter, which isn't supported with the FFMpeg decoder.
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Six functions are implemented in FFMpegVideoDecoder: ``DecodeFrame()``, ``GetFrame()``, ``GetOutputSurfaceInfo()``, ``SaveFrameToFile()``, ``ReleaseFrame()``, and ``ReconfigureDecoder()``.
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``DecodeFrame()`` submits a frame for host-based decoding using the FFMpeg decoder and returns the number of available decoded frames.
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Once decoding is done, ``GetFrame()`` returns the decoded frame and its timestamp and ``GetOutputSurfaceInfo()`` returns a pointer to the metadata associated with the decoded frame.
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``SaveFrameToFile()`` saves the decoded output surface to a file.
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Once processing is complete, ``ReleaseFrame()`` is used to release the frame.
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``ReconfigureDecoder`` is used to reconfigure the decoder when the video stream resolution changes.
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For information about using the FFMpeg decoder, see :doc:`Understanding the rocDecode videodecode sample
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<../how-to/using-rocDecode-videodecode-sample>`.
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.. note::
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The FFmpeg development libraries must be installed to use the FFMpeg decoder:
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``sudo apt install libavcodec-dev libavformat-dev libavutil-dev``
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.. |ffmpeg| replace:: ``utils/ffmpegvideodecode/ffmpeg_video_dec.h``
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.. _ffmpeg: https://github.com/ROCm/rocm-systems/tree/develop/projects/rocdecode/utils/ffmpegvideodecode/ffmpeg_video_dec.h
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.. |rocdecode| replace:: ``utils/rocvideodecode/roc_video_dec.h``
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.. _rocdecode: ttps://github.com/ROCm/rocm-systems/tree/develop/projects/rocdecode/utils/rocvideodecode/roc_video_dec.h
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