Motown: New wrapper classes for ffmpeg format context and io context

services/media/framework_ffmpeg/av_codec_context.cc

 // Copyright 2016 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.
 
 #include "base/logging.h"
-#include "services/media/framework_ffmpeg/ffmpeg_type_converters.h"
+#include "services/media/framework_ffmpeg/av_codec_context.h"
+#include "services/media/framework_ffmpeg/ffmpeg_init.h"
 extern "C" {
 #include "third_party/ffmpeg/libavformat/avformat.h"
 }
 
 // Ffmeg defines this...undefine.
 #undef PixelFormat
 
 namespace mojo {
 namespace media {
 
@@ skipping 310 matching lines @@
 
   if (stream_type.encoding_details()) {
     ExtraDataFromBytes(*stream_type.encoding_details(), context);
   }
 
   return context;
 }
 
 }  // namespace
 
-std::unique_ptr<StreamType> StreamTypeFromAVCodecContext(
+// static
+std::unique_ptr<StreamType> AvCodecContext::GetStreamType(
     const AVCodecContext& from) {
   switch (from.codec_type) {
     case AVMEDIA_TYPE_AUDIO:
       switch (from.codec_id) {
         case CODEC_ID_PCM_S16BE:
         case CODEC_ID_PCM_S16LE:
         case CODEC_ID_PCM_S24BE:
         case CODEC_ID_PCM_S24LE:
         case CODEC_ID_PCM_U8:
           return StreamTypeFromLpcmCodecContext(from);
@@ skipping 12 matching lines @@
       return StreamTypeFromDataCodecContext(from);
     case AVMEDIA_TYPE_SUBTITLE:
       return StreamTypeFromSubtitleCodecContext(from);
     case AVMEDIA_TYPE_ATTACHMENT:
     case AVMEDIA_TYPE_NB:
     default:
       return StreamType::Create(StreamType::Scheme::kUnknown);
   }
 }
 
-AvCodecContextPtr AVCodecContextFromStreamType(const StreamType& stream_type) {
+// static
+AvCodecContextPtr AvCodecContext::Create(const StreamType& stream_type) {
+  InitFfmpeg();
+
   switch (stream_type.scheme()) {
     case StreamType::Scheme::kLpcm:
       return CodecContextFromLpcmDetails(*stream_type.lpcm());
     case StreamType::Scheme::kCompressedAudio:
       return AVCodecContextFromCompressedAudioStreamType(
           *stream_type.compressed_audio());
     case StreamType::Scheme::kVideo:
       return AVCodecContextFromVideoStreamType(*stream_type.video());
     default:
       return nullptr;
   }
 }
 
 } // namespace media
 } // namespace mojo