Add libvpx wrapper to media to support VP9 video decoding.

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"
 #include "media/base/video_util.h"
 
+// TODO(tomfinegan): Remove this once FFmpeg rolls for M25. The VP9 patch is in
+// tree, but this is required until the roll happens.
+#define AV_CODEC_ID_VP9 170
+
 namespace media {
 
 // Why FF_INPUT_BUFFER_PADDING_SIZE? FFmpeg assumes all input buffers are
 // padded. Check here to ensure FFmpeg only receives data padded to its
 // specifications.
 COMPILE_ASSERT(DecoderBuffer::kPaddingSize >= FF_INPUT_BUFFER_PADDING_SIZE,
                decoder_buffer_padding_size_does_not_fit_ffmpeg_requirement);
 
 // Alignment requirement by FFmpeg for input and output buffers. This need to
 // be updated to match FFmpeg when it changes.
@@ skipping 118 matching lines @@
     case CODEC_ID_H264:
       return kCodecH264;
     case CODEC_ID_THEORA:
       return kCodecTheora;
     case CODEC_ID_MPEG2VIDEO:
       return kCodecMPEG2;
     case CODEC_ID_MPEG4:
       return kCodecMPEG4;
     case CODEC_ID_VP8:
       return kCodecVP8;
+    case AV_CODEC_ID_VP9:
+      return kCodecVP9;
     default:
       DVLOG(1) << "Unknown video CodecID: " << codec_id;
   }
   return kUnknownVideoCodec;
 }
 
 static CodecID VideoCodecToCodecID(VideoCodec video_codec) {
   switch (video_codec) {
     case kCodecVC1:
       return CODEC_ID_VC1;
     case kCodecH264:
       return CODEC_ID_H264;
     case kCodecTheora:
       return CODEC_ID_THEORA;
     case kCodecMPEG2:
       return CODEC_ID_MPEG2VIDEO;
     case kCodecMPEG4:
       return CODEC_ID_MPEG4;
     case kCodecVP8:
       return CODEC_ID_VP8;
+    case kCodecVP9:
+      // TODO(tomfinegan): Remove this cast once FFmpeg rolls for M25, and the
+      // local define for AV_CODEC_ID_VP9 is removed.
+      return static_cast<CodecID>(AV_CODEC_ID_VP9);
     default:
       DVLOG(1) << "Unknown VideoCodec: " << video_codec;
   }
   return CODEC_ID_NONE;
 }
 
 static VideoCodecProfile ProfileIDToVideoCodecProfile(int profile) {
   // Clear out the CONSTRAINED & INTRA flags which are strict subsets of the
   // corresponding profiles with which they're used.
   profile &= ~FF_PROFILE_H264_CONSTRAINED;
@@ skipping 123 matching lines @@
   // for now, but may not always be true forever. Fix this in the future.
   gfx::Rect visible_rect(stream->codec->width, stream->codec->height);
 
   AVRational aspect_ratio = { 1, 1 };
   if (stream->sample_aspect_ratio.num)
     aspect_ratio = stream->sample_aspect_ratio;
   else if (stream->codec->sample_aspect_ratio.num)
     aspect_ratio = stream->codec->sample_aspect_ratio;
 
   VideoCodec codec = CodecIDToVideoCodec(stream->codec->codec_id);
   VideoCodecProfile profile = (codec == kCodecVP8) ? VP8PROFILE_MAIN :

[scherkus (not reviewing), 2012/12/18 01:01:56]

for clarity's sake let's unfold the nested ?: operators

VideoCodecProfile profile = VIDEO_CODEC_PROFILE_UNKNOWN;
if (codec == kCodecVP8)
  profile = foo;
else if (codec == kCodecVP9)
  profile = bar;
else
  profile = ProfileIDToVideoCodecProfile(...);

[Tom Finegan, 2012/12/18 01:47:42]

Done.

-      ProfileIDToVideoCodecProfile(stream->codec->profile);
+      (codec == kCodecVP9) ? VP9PROFILE_MAIN :
+          ProfileIDToVideoCodecProfile(stream->codec->profile);
   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;

[scherkus (not reviewing), 2012/12/18 01:01:56]

is this always true?

[Tom Finegan, 2012/12/18 01:47:42]

Yes: libvpx outputs either YV12 or I420. The wrapper always uses YV12, so this
is safe.

+    coded_size = natural_size;
+  }
+
   config->Initialize(codec,
                      profile,
-                     PixelFormatToVideoFormat(stream->codec->pix_fmt),
+                     format,
                      coded_size, visible_rect, natural_size,
                      stream->codec->extradata, stream->codec->extradata_size,
                      false,  // Not encrypted.
                      true);
 }
 
 void VideoDecoderConfigToAVCodecContext(
     const VideoDecoderConfig& config,
     AVCodecContext* codec_context) {
   codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
@@ skipping 104 matching lines @@
       return PIX_FMT_YUV422P;
     case VideoFrame::YV12:
       return PIX_FMT_YUV420P;
     default:
       DVLOG(1) << "Unsupported VideoFrame::Format: " << video_format;
   }
   return PIX_FMT_NONE;
 }
 
 }  // namespace media