Motown: Ffmpeg video decoder

services/media/framework_ffmpeg/av_codec_context.h

 // 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.
 
 #ifndef SERVICES_MEDIA_FRAMEWORK_FFMPEG_AV_CODEC_CONTEXT_H_
 #define SERVICES_MEDIA_FRAMEWORK_FFMPEG_AV_CODEC_CONTEXT_H_
 
 #include "services/media/framework/types/stream_type.h"
 #include "services/media/framework/types/video_stream_type.h"
 extern "C" {
 #include "third_party/ffmpeg/libavformat/avformat.h"
 }
 
+// Ffmeg defines this...undefine.
+#undef PixelFormat
+
 namespace mojo {
 namespace media {
 
 struct AVCodecContextDeleter {
   void operator()(AVCodecContext* context) const {
     avcodec_free_context(&context);
   }
 };
 
 using AvCodecContextPtr =
     std::unique_ptr<AVCodecContext, AVCodecContextDeleter>;
 
 struct AvCodecContext {
   static AvCodecContextPtr Create(const StreamType& stream_type);
 
   static std::unique_ptr<StreamType> GetStreamType(const AVCodecContext& from);
 };
 
+// Converts an AVPixelFormat to a PixelFormat.
+VideoStreamType::PixelFormat PixelFormatFromAVPixelFormat(
+    AVPixelFormat av_pixel_format);
+
+// Converts a PixelFormat to an AVPixelFormat.
+AVPixelFormat AVPixelFormatFromPixelFormat(
+    VideoStreamType::PixelFormat pixel_format);
+
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_FRAMEWORK_FFMPEG_AV_CODEC_CONTEXT_H_