Adding YUVA support for enabling Alpha Playback

media/ffmpeg/ffmpeg_common.cc

 // 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.
 
 #include "media/ffmpeg/ffmpeg_common.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/video_frame.h"
@@ skipping 369 matching lines @@
   gfx::Size natural_size = GetNaturalSize(
       visible_rect.size(), aspect_ratio.num, aspect_ratio.den);
 
   VideoFrame::Format format = PixelFormatToVideoFormat(stream->codec->pix_fmt);
   if (codec == kCodecVP9) {
     // TODO(tomfinegan): libavcodec doesn't know about VP9.
     format = VideoFrame::YV12;
     coded_size = natural_size;
   }
 
+  AVDictionaryEntry *webm_alpha =

[fgalligan1, 2013/02/12 01:20:58]

nit: Asterisk adjacent to the type per style in this file.

[vigneshv, 2013/02/14 19:06:14]

Done.

+          av_dict_get(stream->metadata, "alpha_mode", NULL, 0);

[fgalligan1, 2013/02/12 01:20:58]

4 space indent
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Function_Decla...

[vigneshv, 2013/02/14 19:06:14]

Done.

+  if (webm_alpha && !strcmp(webm_alpha->value, "1")) {
+    format = VideoFrame::YV12A;
+  }
+
   config->Initialize(codec,
                      profile,
                      format,
                      coded_size, visible_rect, natural_size,
                      stream->codec->extradata, stream->codec->extradata_size,
                      false,  // Not encrypted.
                      true);
 }
 
 void VideoDecoderConfigToAVCodecContext(
@@ skipping 92 matching lines @@
 VideoFrame::Format PixelFormatToVideoFormat(PixelFormat pixel_format) {
   switch (pixel_format) {
     case PIX_FMT_YUV422P:
       return VideoFrame::YV16;
     // TODO(scherkus): We should be paying attention to the color range of each
     // format and scaling as appropriate when rendering. Regular YUV has a range
     // of 16-239 where as YUVJ has a range of 0-255.
     case PIX_FMT_YUV420P:
     case PIX_FMT_YUVJ420P:
       return VideoFrame::YV12;
+    case PIX_FMT_YUVA420P:
+      return VideoFrame::YV12A;
     default:
       DVLOG(1) << "Unsupported PixelFormat: " << pixel_format;
   }
   return VideoFrame::INVALID;
 }
 
 PixelFormat VideoFormatToPixelFormat(VideoFrame::Format video_format) {
   switch (video_format) {
     case VideoFrame::YV16:
       return PIX_FMT_YUV422P;
     case VideoFrame::YV12:
       return PIX_FMT_YUV420P;
+    case VideoFrame::YV12A:
+      return PIX_FMT_YUVA420P;
     default:
       DVLOG(1) << "Unsupported VideoFrame::Format: " << video_format;
   }
   return PIX_FMT_NONE;
 }
 
 }  // namespace media