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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 "base/macros.h"
#include "media/base/media_export.h"
#include "media/formats/mp4/bitstream_converter.h"
#include "media/media_buildflags.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);
// Verifies that the contents of |buffer| conform to
// Section 7.4.1.2.3 of ISO/IEC 14496-10.
// |subsamples| contains the information about what parts of the buffer are
// encrypted and which parts are clear.
// Returns true if |buffer| contains conformant Annex B data
static bool IsValidAnnexB(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);
#if BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
// TODO(erickung): Dolby Vision should have its own subclasses of the
// bitstream converters so that the validation logic can properly accommodate
// it.
void disable_validation() { disable_validation_ = true; }
#endif // BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
// BitstreamConverter interface
bool ConvertFrame(std::vector<uint8_t>* frame_buf,
bool is_keyframe,
std::vector<SubsampleEntry>* subsamples) const override;
bool IsValid(std::vector<uint8_t>* frame_buf,
std::vector<SubsampleEntry>* subsamples) const override;
private:
~AVCBitstreamConverter() override;
std::unique_ptr<AVCDecoderConfigurationRecord> avc_config_;
#if BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
// Annex B validation is short-circuited when true.
bool disable_validation_;
#endif // BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
DISALLOW_COPY_AND_ASSIGN(AVCBitstreamConverter);
};
} // namespace mp4
} // namespace media
#endif // MEDIA_FORMATS_MP4_AVC_H_
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