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/internal.h>
  36 #include <libavformat/avio.h>
  37 #include <libavutil/avutil.h>
  38 #include <libavutil/imgutils.h>
  39 #include <libavutil/log.h>
  40 #include <libavutil/mathematics.h>
  41 #include <libavutil/opt.h>
  42 MSVC_POP_WARNING();
  43 }  // extern "C"
  44
  45 namespace media {
  46
  47 class AudioDecoderConfig;
  48 class VideoDecoderConfig;
  49
  50 // The following implement the deleters declared in ffmpeg_deleters.h (which
  51 // contains the declarations needed for use with |scoped_ptr| without #include
  52 // "pollution").
  53
  54 inline void ScopedPtrAVFree::operator()(void* x) const {
  55   av_free(x);
  56 }
  57
  58 inline void ScopedPtrAVFreePacket::operator()(void* x) const {
  59   AVPacket* packet = static_cast<AVPacket*>(x);
  60   av_free_packet(packet);
  61   delete packet;
  62 }
  63
  64 inline void ScopedPtrAVFreeContext::operator()(void* x) const {
  65   AVCodecContext* codec_context = static_cast<AVCodecContext*>(x);
  66   avcodec_free_context(&codec_context);
  67 }
  68
  69 inline void ScopedPtrAVFreeFrame::operator()(void* x) const {
  70   AVFrame* frame = static_cast<AVFrame*>(x);
  71   av_frame_free(&frame);
  72 }
  73
  74 // Converts an int64 timestamp in |time_base| units to a base::TimeDelta.
  75 // For example if |timestamp| equals 11025 and |time_base| equals {1, 44100}
  76 // then the return value will be a base::TimeDelta for 0.25 seconds since that
  77 // is how much time 11025/44100ths of a second represents.
  78 MEDIA_EXPORT base::TimeDelta ConvertFromTimeBase(const AVRational& time_base,
  79                                                  int64 timestamp);
  80
  81 // Converts a base::TimeDelta into an int64 timestamp in |time_base| units.
  82 // For example if |timestamp| is 0.5 seconds and |time_base| is {1, 44100}, then
  83 // the return value will be 22050 since that is how many 1/44100ths of a second
  84 // represent 0.5 seconds.
  85 MEDIA_EXPORT int64 ConvertToTimeBase(const AVRational& time_base,
  86                                      const base::TimeDelta& timestamp);
  87
  88 void AVStreamToAudioDecoderConfig(
  89     const AVStream* stream,
  90     AudioDecoderConfig* config,
  91     bool record_stats);
  92 void AudioDecoderConfigToAVCodecContext(
  93     const AudioDecoderConfig& config,
  94     AVCodecContext* codec_context);
  95
  96 void AVStreamToVideoDecoderConfig(
  97     const AVStream* stream,
  98     VideoDecoderConfig* config,
  99     bool record_stats);
 100 void VideoDecoderConfigToAVCodecContext(
 101     const VideoDecoderConfig& config,
 102     AVCodecContext* codec_context);
 103
 104 MEDIA_EXPORT void AVCodecContextToAudioDecoderConfig(
 105     const AVCodecContext* codec_context,
 106     bool is_encrypted,
 107     AudioDecoderConfig* config,
 108     bool record_stats);
 109
 110 // Converts FFmpeg's channel layout to chrome's ChannelLayout.  |channels| can
 111 // be used when FFmpeg's channel layout is not informative in order to make a
 112 // good guess about the plausible channel layout based on number of channels.
 113 MEDIA_EXPORT ChannelLayout ChannelLayoutToChromeChannelLayout(int64_t layout,
 114                                                               int channels);
 115
 116 // Converts FFmpeg's audio sample format to Chrome's SampleFormat.
 117 MEDIA_EXPORT SampleFormat
 118     AVSampleFormatToSampleFormat(AVSampleFormat sample_format);
 119
 120 // Converts FFmpeg's pixel formats to its corresponding supported video format.
 121 MEDIA_EXPORT VideoPixelFormat
 122 PixelFormatToVideoPixelFormat(PixelFormat pixel_format);
 123
 124 // Converts video formats to its corresponding FFmpeg's pixel formats.
 125 PixelFormat VideoPixelFormatToPixelFormat(VideoPixelFormat video_format);
 126
 127 ColorSpace AVColorSpaceToColorSpace(AVColorSpace color_space);
 128
 129 // Convert FFmpeg UTC representation (YYYY-MM-DD HH:MM:SS) to base::Time.
 130 // Returns true and sets |*out| if |date_utc| contains a valid
 131 // date string. Otherwise returns fals and timeline_offset is unmodified.
 132 MEDIA_EXPORT bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out);
 133
 134 }  // namespace media
 135
 136 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_