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- // Copyright 2014 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_FORMATS_MP4_AVC_H_
- #define MEDIA_FORMATS_MP4_AVC_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include <vector>
- #include "media/base/media_export.h"
- #include "media/formats/mp4/bitstream_converter.h"
- namespace media {
- struct SubsampleEntry;
- namespace mp4 {
- struct AVCDecoderConfigurationRecord;
- class MEDIA_EXPORT AVC {
- public:
- static bool ConvertFrameToAnnexB(size_t length_size,
- std::vector<uint8_t>* buffer,
- std::vector<SubsampleEntry>* subsamples);
- // Inserts the SPS & PPS data from |avc_config| into |buffer|.
- // |buffer| is expected to contain AnnexB conformant data.
- // |subsamples| contains the SubsampleEntry info if |buffer| contains
- // encrypted data.
- // Returns true if the param sets were successfully inserted.
- static bool InsertParamSetsAnnexB(
- const AVCDecoderConfigurationRecord& avc_config,
- std::vector<uint8_t>* buffer,
- std::vector<SubsampleEntry>* subsamples);
- static bool ConvertConfigToAnnexB(
- const AVCDecoderConfigurationRecord& avc_config,
- std::vector<uint8_t>* buffer);
- // Analyzes the contents of |buffer| for conformance to Section 7.4.1.2.3 of
- // ISO/IEC 14496-10. Also analyzes |buffer| and reports if it looks like a
- // keyframe, if such can be determined. Determination of keyframe-ness is done
- // only if |buffer| is conformant or if lack of conformance is detected after
- // detecting keyframe-ness.
- // |subsamples| contains the information about what parts of the buffer are
- // encrypted and which parts are clear.
- static BitstreamConverter::AnalysisResult AnalyzeAnnexB(
- const uint8_t* buffer,
- size_t size,
- const std::vector<SubsampleEntry>& subsamples);
- // Given a |buffer| and |subsamples| information and |pts| pointer into the
- // |buffer| finds the index of the subsample |ptr| is pointing into.
- static int FindSubsampleIndex(const std::vector<uint8_t>& buffer,
- const std::vector<SubsampleEntry>* subsamples,
- const uint8_t* ptr);
- };
- // AVCBitstreamConverter converts AVC/H.264 bitstream from MP4 container format
- // with embedded NALU lengths into AnnexB bitstream format (described in ISO/IEC
- // 14496-10) with 4-byte start codes. It also knows how to handle CENC-encrypted
- // streams and adjusts subsample data for those streams while converting.
- class AVCBitstreamConverter : public BitstreamConverter {
- public:
- explicit AVCBitstreamConverter(
- std::unique_ptr<AVCDecoderConfigurationRecord> avc_config);
- AVCBitstreamConverter(const AVCBitstreamConverter&) = delete;
- AVCBitstreamConverter& operator=(const AVCBitstreamConverter&) = delete;
- // BitstreamConverter interface
- bool ConvertAndAnalyzeFrame(std::vector<uint8_t>* frame_buf,
- bool is_keyframe,
- std::vector<SubsampleEntry>* subsamples,
- AnalysisResult* analysis_result) const override;
- private:
- ~AVCBitstreamConverter() override;
- AnalysisResult Analyze(
- std::vector<uint8_t>* frame_buf,
- std::vector<SubsampleEntry>* subsamples) const override;
- std::unique_ptr<AVCDecoderConfigurationRecord> avc_config_;
- };
- } // namespace mp4
- } // namespace media
- #endif // MEDIA_FORMATS_MP4_AVC_H_
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