media: Add support for playback of VP8 Alpha video streams

media/base/yuv_convert.h

 // Copyright (c) 2012 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 MEDIA_BASE_YUV_CONVERT_H_
 #define MEDIA_BASE_YUV_CONVERT_H_
 
 #include "base/basictypes.h"
 
 // Visual Studio 2010 does not support MMX intrinsics on x64.
@@ skipping 42 matching lines @@
                        const uint8* uplane,
                        const uint8* vplane,
                        uint8* rgbframe,
                        int width,
                        int height,
                        int ystride,
                        int uvstride,
                        int rgbstride,
                        YUVType yuv_type);
 
+// Convert a frame of YUVA to 32 bit ARGB.
+// Pass in YV12A
+void ConvertYUVAToARGB(const uint8* yplane,
+                       const uint8* uplane,
+                       const uint8* vplane,
+                       const uint8* aplane,
+                       uint8* rgbframe,
+                       int width,
+                       int height,
+                       int ystride,
+                       int uvstride,
+                       int astride,
+                       int rgbstride,
+                       YUVType yuv_type);
+
 // Scale a frame of YUV to 32 bit ARGB.
 // Supports rotation and mirroring.
 void ScaleYUVToRGB32(const uint8* yplane,
                      const uint8* uplane,
                      const uint8* vplane,
                      uint8* rgbframe,
                      int source_width,
                      int source_height,
                      int width,
                      int height,
@@ skipping 56 matching lines @@
                       uint8* vplane,
                       int width,
                       int height);
 
 // Empty SIMD register state after calling optimized scaler functions.
 void EmptyRegisterState();
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_YUV_CONVERT_H_