media: Add support for playback of VP8 Alpha video streams

media/base/video_util.h

Index: media/base/video_util.h
diff --git a/media/base/video_util.h b/media/base/video_util.h
index 562ad7d86ccae39af852ae8d4ece09dba94a9889..18980b83eaaa4349d504870391f717804f78501d 100644
--- a/media/base/video_util.h
+++ b/media/base/video_util.h
@@ -28,6 +28,11 @@ MEDIA_EXPORT void CopyUPlane(const uint8* source, int stride, int rows,
                              VideoFrame* frame);
 MEDIA_EXPORT void CopyVPlane(const uint8* source, int stride, int rows,
                              VideoFrame* frame);
+MEDIA_EXPORT void CopyAPlane(const uint8* source, int stride, int rows,
+                             VideoFrame* frame);
+
+// Sets A Plane values to be completely opaque (all 255's)
+MEDIA_EXPORT void MakeOpaqueAPlane(int stride, int rows, VideoFrame* frame);

[scherkus (not reviewing), 2013/02/27 07:28:26]

Not to bikeshed too much on the naming ... but "MakeAPlaneOpaque" is more proper

alternatively, "to opacify" is a verb to make something opaque:
http://wordnetweb.princeton.edu/perl/webwn?s=opacify

... but I just discovered that and I don't think most people will understand it
:)

[vignesh, 2013/03/28 21:45:12]

I went with naming it like other functions in this file (ending with "APlane").
Anyway, MakeOpaqueAPlane seems much better. Have changed it. :)

 
 // Fills |frame| containing YUV data to the given color values.
 MEDIA_EXPORT void FillYUV(VideoFrame* frame, uint8 y, uint8 u, uint8 v);