Plumb decoded video pixel format from GPU process to renderer.

content/renderer/media/rtc_video_decoder.cc

Index: content/renderer/media/rtc_video_decoder.cc
diff --git a/content/renderer/media/rtc_video_decoder.cc b/content/renderer/media/rtc_video_decoder.cc
index d0d0387957c6c07795450b2b343c40dd393c2b42..96a6af4d0e1e03fac0d9487242c4baada32c5aed 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -66,6 +66,7 @@ RTCVideoDecoder::RTCVideoDecoder(webrtc::VideoCodecType type,
       video_codec_type_(type),
       factories_(factories),
       decoder_texture_target_(0),
+      pixel_format_(media::PIXEL_FORMAT_UNKNOWN),
       next_picture_buffer_id_(0),
       state_(UNINITIALIZED),
       decode_complete_callback_(nullptr),
@@ -311,6 +312,7 @@ int32_t RTCVideoDecoder::Release() {
 }
 
 void RTCVideoDecoder::ProvidePictureBuffers(uint32_t count,
+                                            media::VideoPixelFormat format,
                                             uint32_t textures_per_buffer,
                                             const gfx::Size& size,
                                             uint32_t texture_target) {
@@ -348,6 +350,10 @@ void RTCVideoDecoder::ProvidePictureBuffers(uint32_t count,
         picture_buffers.back().id(), picture_buffers.back())).second;
     DCHECK(inserted);
   }
+
+  pixel_format_ = format;
+  if (pixel_format_ == media::PIXEL_FORMAT_UNKNOWN)
+    pixel_format_ = media::PIXEL_FORMAT_ARGB;

[Pawel Osciak, 2016/05/26 08:54:07]

We should probably refuse format change in this class as well.

   vda_->AssignPictureBuffers(picture_buffers);
 }
 
@@ -400,12 +406,8 @@ void RTCVideoDecoder::PictureReady(const media::Picture& picture) {
     return;
   }
 
-  media::VideoPixelFormat pixel_format = vda_->GetOutputFormat();
-  if (pixel_format == media::PIXEL_FORMAT_UNKNOWN)
-    pixel_format = media::PIXEL_FORMAT_ARGB;
-
   scoped_refptr<media::VideoFrame> frame =
-      CreateVideoFrame(picture, pb, timestamp, visible_rect, pixel_format);
+      CreateVideoFrame(picture, pb, timestamp, visible_rect, pixel_format_);
   if (!frame) {
     NotifyError(media::VideoDecodeAccelerator::PLATFORM_FAILURE);
     return;