media/ffmpeg/ffmpeg_common.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_FFMPEG_FFMPEG_COMMON_H_
   6 #define MEDIA_FFMPEG_FFMPEG_COMMON_H_
   7
   8 // Used for FFmpeg error codes.
   9 #include <cerrno>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/time/time.h"
  13 #include "media/base/audio_decoder_config.h"
  14 #include "media/base/channel_layout.h"
  15 #include "media/base/media_export.h"
  16 #include "media/base/video_decoder_config.h"
  17 #include "media/base/video_frame.h"
  18 #include "media/ffmpeg/ffmpeg_deleters.h"
  19
  20 // Include FFmpeg header files.
  21 extern "C" {
  22 // Disable deprecated features which result in spammy compile warnings.  This
  23 // list of defines must mirror those in the 'defines' section of the ffmpeg.gyp
  24 // file or the headers below will generate different structures.
  25 #define FF_API_PIX_FMT_DESC 0
  26 #define FF_API_OLD_DECODE_AUDIO 0
  27 #define FF_API_DESTRUCT_PACKET 0
  28 #define FF_API_GET_BUFFER 0
  29
  30 // Temporarily disable possible loss of data warning.
  31 // TODO(scherkus): fix and upstream the compiler warnings.
  32 MSVC_PUSH_DISABLE_WARNING(4244);
  33 #include <libavcodec/avcodec.h>
  34 #include <libavformat/avformat.h>
  35 #include <libavformat/avio.h>
  36 #include <libavutil/audioconvert.h>
  37 #include <libavutil/avutil.h>
  38 #include <libavutil/mathematics.h>
  39 #include <libavutil/log.h>
  40 #include <libavutil/imgutils.h>
  41 MSVC_POP_WARNING();
  42 }  // extern "C"
  43
  44 namespace media {
  45
  46 class AudioDecoderConfig;
  47 class VideoDecoderConfig;
  48
  49 // The following implement the deleters declared in ffmpeg_deleters.h (which
  50 // contains the declarations needed for use with |scoped_ptr| without #include
  51 // "pollution").
  52
  53 inline void ScopedPtrAVFree::operator()(void* x) const {
  54   av_free(x);
  55 }
  56
  57 inline void ScopedPtrAVFreePacket::operator()(void* x) const {
  58   AVPacket* packet = static_cast<AVPacket*>(x);
  59   av_free_packet(packet);
  60   delete packet;
  61 }
  62
  63 inline void ScopedPtrAVFreeContext::operator()(void* x) const {
  64   AVCodecContext* codec_context = static_cast<AVCodecContext*>(x);
  65   av_free(codec_context->extradata);
  66   avcodec_close(codec_context);
  67   av_free(codec_context);
  68 }
  69
  70 inline void ScopedPtrAVFreeFrame::operator()(void* x) const {
  71   AVFrame* frame = static_cast<AVFrame*>(x);
  72   av_frame_free(&frame);
  73 }
  74
  75 // Converts an int64 timestamp in |time_base| units to a base::TimeDelta.
  76 // For example if |timestamp| equals 11025 and |time_base| equals {1, 44100}
  77 // then the return value will be a base::TimeDelta for 0.25 seconds since that
  78 // is how much time 11025/44100ths of a second represents.
  79 MEDIA_EXPORT base::TimeDelta ConvertFromTimeBase(const AVRational& time_base,
  80                                                  int64 timestamp);
  81
  82 // Converts a base::TimeDelta into an int64 timestamp in |time_base| units.
  83 // For example if |timestamp| is 0.5 seconds and |time_base| is {1, 44100}, then
  84 // the return value will be 22050 since that is how many 1/44100ths of a second
  85 // represent 0.5 seconds.
  86 MEDIA_EXPORT int64 ConvertToTimeBase(const AVRational& time_base,
  87                                      const base::TimeDelta& timestamp);
  88
  89 void AVStreamToAudioDecoderConfig(
  90     const AVStream* stream,
  91     AudioDecoderConfig* config,
  92     bool record_stats);
  93 void AudioDecoderConfigToAVCodecContext(
  94     const AudioDecoderConfig& config,
  95     AVCodecContext* codec_context);
  96
  97 void AVStreamToVideoDecoderConfig(
  98     const AVStream* stream,
  99     VideoDecoderConfig* config,
 100     bool record_stats);
 101 void VideoDecoderConfigToAVCodecContext(
 102     const VideoDecoderConfig& config,
 103     AVCodecContext* codec_context);
 104
 105 MEDIA_EXPORT void AVCodecContextToAudioDecoderConfig(
 106     const AVCodecContext* codec_context,
 107     bool is_encrypted,
 108     AudioDecoderConfig* config,
 109     bool record_stats);
 110
 111 // Converts FFmpeg's channel layout to chrome's ChannelLayout.  |channels| can
 112 // be used when FFmpeg's channel layout is not informative in order to make a
 113 // good guess about the plausible channel layout based on number of channels.
 114 MEDIA_EXPORT ChannelLayout ChannelLayoutToChromeChannelLayout(int64_t layout,
 115                                                               int channels);
 116
 117 // Converts FFmpeg's audio sample format to Chrome's SampleFormat.
 118 MEDIA_EXPORT SampleFormat
 119     AVSampleFormatToSampleFormat(AVSampleFormat sample_format);
 120
 121 // Converts FFmpeg's pixel formats to its corresponding supported video format.
 122 MEDIA_EXPORT VideoFrame::Format PixelFormatToVideoFormat(
 123     PixelFormat pixel_format);
 124
 125 // Converts video formats to its corresponding FFmpeg's pixel formats.
 126 PixelFormat VideoFormatToPixelFormat(VideoFrame::Format video_format);
 127
 128 // Convert FFmpeg UTC representation (YYYY-MM-DD HH:MM:SS) to base::Time.
 129 // Returns true and sets |*out| if |date_utc| contains a valid
 130 // date string. Otherwise returns fals and timeline_offset is unmodified.
 131 MEDIA_EXPORT bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out);
 132
 133 }  // namespace media
 134
 135 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_