media: Add support for playback of VP8 Alpha video streams

BUG=147355
TEST=VP8 Alpha video streams play
TBR=sky

Review URL: https://chromiumcodereview.appspot.com/13886011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195339 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 0 deletions

diff --git a/media/base/video_util.cc b/media/base/video_util.cc
index 972ac17..e1de7bd 100644
--- a/media/base/video_util.cc
+++ b/media/base/video_util.cc
@@ -62,6 +62,16 @@ void CopyVPlane(const uint8* source, int stride, int rows, VideoFrame* frame) {
   CopyPlane(VideoFrame::kVPlane, source, stride, rows, frame);
 }
 
+void CopyAPlane(const uint8* source, int stride, int rows, VideoFrame* frame) {
+  CopyPlane(VideoFrame::kAPlane, source, stride, rows, frame);
+}
+
+void MakeOpaqueAPlane(int stride, int rows, VideoFrame* frame) {
+  int rows_to_clear = std::min(frame->rows(VideoFrame::kAPlane), rows);
+  memset(frame->data(VideoFrame::kAPlane), 255,
+         frame->stride(VideoFrame::kAPlane) * rows_to_clear);
+}
+
 void FillYUV(VideoFrame* frame, uint8 y, uint8 u, uint8 v) {
   // Fill the Y plane.
   uint8* y_plane = frame->data(VideoFrame::kYPlane);