1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59


media / filters / ffmpeg_aac_bitstream_converter.h [blame]

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_
#define MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_

#include <stdint.h>

#include "base/memory/raw_ptr.h"
#include "media/base/media_export.h"
#include "media/filters/ffmpeg_bitstream_converter.h"

// Forward declarations for FFmpeg datatypes used.
struct AVCodecParameters;
struct AVPacket;

namespace media {

// Bitstream converter that adds ADTS headers to AAC frames.
class MEDIA_EXPORT FFmpegAACBitstreamConverter
    : public FFmpegBitstreamConverter {
 public:
  enum { kAdtsHeaderSize = 7 };

  // 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 FFmpegAACBitstreamConverter(
      AVCodecParameters* stream_codec_parameters);

  FFmpegAACBitstreamConverter(const FFmpegAACBitstreamConverter&) = delete;
  FFmpegAACBitstreamConverter& operator=(const FFmpegAACBitstreamConverter&) =
      delete;

  ~FFmpegAACBitstreamConverter() override;

  // FFmpegBitstreamConverter implementation.
  // Uses FFmpeg allocation methods for buffer allocation to ensure
  // compatibility with FFmpeg's memory management.
  bool ConvertPacket(AVPacket* packet) override;

 private:
  // 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_;

  bool header_generated_;
  uint8_t hdr_[kAdtsHeaderSize];
  int codec_;
  int audio_profile_;
  int sample_rate_index_;
  int channel_configuration_;
  int frame_length_;
};

}  // namespace media

#endif  // MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_