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 // Temporarily disable possible loss of data warning.
  23 // TODO(scherkus): fix and upstream the compiler warnings.
  24 MSVC_PUSH_DISABLE_WARNING(4244);
  25 #include <libavcodec/avcodec.h>
  26 #include <libavformat/avformat.h>
  27 #include <libavformat/avio.h>
  28 #include <libavutil/audioconvert.h>
  29 #include <libavutil/avutil.h>
  30 #include <libavutil/mathematics.h>
  31 #include <libavutil/log.h>
  32 #include <libavutil/imgutils.h>
  33 MSVC_POP_WARNING();
  34 }  // extern "C"
  35
  36 namespace media {
  37
  38 class AudioDecoderConfig;
  39 class VideoDecoderConfig;
  40
  41 // The following implement the deleters declared in ffmpeg_deleters.h (which
  42 // contains the declarations needed for use with |scoped_ptr| without #include
  43 // "pollution").
  44
  45 inline void ScopedPtrAVFree::operator()(void* x) const {
  46   av_free(x);
  47 }
  48
  49 inline void ScopedPtrAVFreePacket::operator()(void* x) const {
  50   AVPacket* packet = static_cast<AVPacket*>(x);
  51   av_free_packet(packet);
  52   delete packet;
  53 }
  54
  55 inline void ScopedPtrAVFreeContext::operator()(void* x) const {
  56   AVCodecContext* codec_context = static_cast<AVCodecContext*>(x);
  57   av_free(codec_context->extradata);
  58   avcodec_close(codec_context);
  59   av_free(codec_context);
  60 }
  61
  62 inline void ScopedPtrAVFreeFrame::operator()(void* x) const {
  63   AVFrame* frame = static_cast<AVFrame*>(x);
  64   avcodec_free_frame(&frame);
  65 }
  66
  67 // Converts an int64 timestamp in |time_base| units to a base::TimeDelta.
  68 // For example if |timestamp| equals 11025 and |time_base| equals {1, 44100}
  69 // then the return value will be a base::TimeDelta for 0.25 seconds since that
  70 // is how much time 11025/44100ths of a second represents.
  71 MEDIA_EXPORT base::TimeDelta ConvertFromTimeBase(const AVRational& time_base,
  72                                                  int64 timestamp);
  73
  74 // Converts a base::TimeDelta into an int64 timestamp in |time_base| units.
  75 // For example if |timestamp| is 0.5 seconds and |time_base| is {1, 44100}, then
  76 // the return value will be 22050 since that is how many 1/44100ths of a second
  77 // represent 0.5 seconds.
  78 MEDIA_EXPORT int64 ConvertToTimeBase(const AVRational& time_base,
  79                                      const base::TimeDelta& timestamp);
  80
  81 void AVStreamToAudioDecoderConfig(
  82     const AVStream* stream,
  83     AudioDecoderConfig* config,
  84     bool record_stats);
  85 void AudioDecoderConfigToAVCodecContext(
  86     const AudioDecoderConfig& config,
  87     AVCodecContext* codec_context);
  88
  89 void AVStreamToVideoDecoderConfig(
  90     const AVStream* stream,
  91     VideoDecoderConfig* config,
  92     bool record_stats);
  93 void VideoDecoderConfigToAVCodecContext(
  94     const VideoDecoderConfig& config,
  95     AVCodecContext* codec_context);
  96
  97 MEDIA_EXPORT void AVCodecContextToAudioDecoderConfig(
  98     const AVCodecContext* codec_context,
  99     bool is_encrypted,
 100     AudioDecoderConfig* config,
 101     bool record_stats);
 102
 103 // Converts FFmpeg's channel layout to chrome's ChannelLayout.  |channels| can
 104 // be used when FFmpeg's channel layout is not informative in order to make a
 105 // good guess about the plausible channel layout based on number of channels.
 106 ChannelLayout ChannelLayoutToChromeChannelLayout(int64_t layout,
 107                                                  int channels);
 108
 109 // Converts FFmpeg's audio sample format to Chrome's SampleFormat.
 110 MEDIA_EXPORT SampleFormat
 111     AVSampleFormatToSampleFormat(AVSampleFormat sample_format);
 112
 113 // Converts FFmpeg's pixel formats to its corresponding supported video format.
 114 MEDIA_EXPORT VideoFrame::Format PixelFormatToVideoFormat(
 115     PixelFormat pixel_format);
 116
 117 // Converts video formats to its corresponding FFmpeg's pixel formats.
 118 PixelFormat VideoFormatToPixelFormat(VideoFrame::Format video_format);
 119
 120 // Convert FFmpeg UTC representation (YYYY-MM-DD HH:MM:SS) to base::Time.
 121 // Returns true and sets |*out| if |date_utc| contains a valid
 122 // date string. Otherwise returns fals and timeline_offset is unmodified.
 123 MEDIA_EXPORT bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out);
 124
 125 }  // namespace media
 126
 127 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_