Bug 1206979: P2. Get around libav 0.8.5 bug. r=edwin

And probably others. When multhreading decoding is enabled ; the frames dimensions were incorrectly set.

dom/media/platforms/ffmpeg/FFmpegH264Decoder.cpp

@@ -30,6 +30,8 @@ FFmpegH264Decoder<LIBAV_VER>::FFmpegH264Decoder(
   ImageContainer* aImageContainer)
   : FFmpegDataDecoder(aTaskQueue, aCallback, GetCodecId(aConfig.mMimeType))
   , mImageContainer(aImageContainer)
+  , mPictureWidth(aConfig.mImage.width)
+  , mPictureHeight(aConfig.mImage.height)
   , mDisplayWidth(aConfig.mDisplay.width)
   , mDisplayHeight(aConfig.mDisplay.height)
   , mCodecParser(nullptr)
@@ -49,6 +51,8 @@ FFmpegH264Decoder<LIBAV_VER>::Init()
 
   mCodecContext->get_buffer = AllocateBufferCb;
   mCodecContext->release_buffer = ReleaseBufferCb;
+  mCodecContext->width = mPictureWidth;
+  mCodecContext->height = mPictureHeight;
 
   return InitPromise::CreateAndResolve(TrackInfo::kVideoTrack, __func__);
 }

dom/media/platforms/ffmpeg/FFmpegH264Decoder.h

@@ -62,6 +62,8 @@ private:
   int64_t GetPts(const AVPacket& packet);
 
   nsRefPtr<ImageContainer> mImageContainer;
+  uint32_t mPictureWidth;
+  uint32_t mPictureHeight;
   uint32_t mDisplayWidth;
   uint32_t mDisplayHeight;
   AVCodecParserContext* mCodecParser;