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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_FILTERS_FFMPEG_H264_TO_ANNEX_B_BITSTREAM_CONVERTER_H_
- #define MEDIA_FILTERS_FFMPEG_H264_TO_ANNEX_B_BITSTREAM_CONVERTER_H_
- #include "base/memory/raw_ptr.h"
- #include "media/base/media_export.h"
- #include "media/filters/ffmpeg_bitstream_converter.h"
- #include "media/filters/h264_to_annex_b_bitstream_converter.h"
- // Forward declarations for FFmpeg datatypes used.
- struct AVCodecParameters;
- struct AVPacket;
- namespace media {
- // Bitstream converter that converts H.264 bitstream based FFmpeg packets into
- // H.264 Annex B bytestream format.
- class MEDIA_EXPORT FFmpegH264ToAnnexBBitstreamConverter
- : public FFmpegBitstreamConverter {
- public:
- // The |stream_codec_parameters| will be used during conversion and should be
- // the AVCodecParameters for the stream sourcing these packets. A reference to
- // |stream_codec_parameters| is retained, so it must outlive this class.
- explicit FFmpegH264ToAnnexBBitstreamConverter(
- AVCodecParameters* stream_codec_parameters);
- FFmpegH264ToAnnexBBitstreamConverter(
- const FFmpegH264ToAnnexBBitstreamConverter&) = delete;
- FFmpegH264ToAnnexBBitstreamConverter& operator=(
- const FFmpegH264ToAnnexBBitstreamConverter&) = delete;
- ~FFmpegH264ToAnnexBBitstreamConverter() override;
- // FFmpegBitstreamConverter implementation.
- // Converts |packet| to H.264 Annex B bytestream format. This conversion is
- // on single NAL unit basis which is contained within the |packet| with the
- // exception of the first packet which is prepended with the AVC decoder
- // configuration record information. For example:
- //
- // NAL unit #1 ==> bytestream buffer #1 (AVC configuraion + NAL unit #1)
- // NAL unit #2 ==> bytestream buffer #2 (NAL unit #2)
- // ...
- // NAL unit #n ==> bytestream buffer #n (NAL unit #n)
- //
- // Returns true if conversion succeeded. In this case, the output will be
- // stored into the |packet|. But user should be aware that this conversion can
- // free and reallocate the |packet|, if it needs to do so to fit it in.
- // FFmpeg allocation methods will be used for buffer allocation to ensure
- // compatibility with FFmpeg's memory management.
- //
- // Returns false if conversion failed. In this case, the |packet| will not
- // be changed.
- bool ConvertPacket(AVPacket* packet) override;
- private:
- // Actual converter class.
- H264ToAnnexBBitstreamConverter converter_;
- // Flag for indicating whether global parameter sets have been processed.
- bool configuration_processed_;
- // Variable to hold a pointer to memory where we can access the global
- // data from the FFmpeg file format's global headers.
- raw_ptr<AVCodecParameters> stream_codec_parameters_;
- };
- } // namespace media
- #endif // MEDIA_FILTERS_FFMPEG_H264_TO_ANNEX_B_BITSTREAM_CONVERTER_H_
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