media: Opus support for WebM in Media Source

media/webm/webm_parser.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/webm/webm_parser.h"
 
 // This file contains code to parse WebM file elements. It was created
 // from information in the Matroska spec.
 // http://www.matroska.org/technical/specs/index.html
 // This file contains code for encrypted WebM. Current WebM
@@ skipping 101 matching lines @@
 };
 
 static const ElementIdInfo kBlockGroupIds[] = {
   {BINARY, kWebMIdBlock},
   {LIST, kWebMIdBlockAdditions},
   {UINT, kWebMIdBlockDuration},
   {UINT, kWebMIdReferencePriority},
   {BINARY, kWebMIdReferenceBlock},
   {BINARY, kWebMIdCodecState},
   {LIST, kWebMIdSlices},
+  {UINT, kWebMIdDiscardPadding},

[fgalligan1, 2013/08/26 21:10:06]

DiscardPadding should come after CodecState.

[vignesh, 2013/08/26 21:44:23]

Done.

 };
 
 static const ElementIdInfo kBlockAdditionsIds[] = {
   {LIST, kWebMIdBlockMore},
 };
 
 static const ElementIdInfo kBlockMoreIds[] = {
   {UINT, kWebMIdBlockAddID},
   {BINARY, kWebMIdBlockAdditional},
 };
@@ skipping 21 matching lines @@
   {UINT, kWebMIdMinCache},
   {UINT, kWebMIdMaxCache},
   {UINT, kWebMIdDefaultDuration},
   {FLOAT, kWebMIdTrackTimecodeScale},
   {UINT, kWebMIdMaxBlockAdditionId},
   {STRING, kWebMIdName},
   {STRING, kWebMIdLanguage},
   {STRING, kWebMIdCodecID},
   {BINARY, kWebMIdCodecPrivate},
   {STRING, kWebMIdCodecName},
+  {UINT, kWebMIdSeekPreRoll},

[fgalligan1, 2013/08/26 21:10:06]

These should be switched according to the spec layout.
http://matroska.org/technical/specs/index.html

Also CodecDelay should come after TrackOverlay. 

[vignesh, 2013/08/26 21:44:23]

Done.

+  {UINT, kWebMIdCodecDelay},
   {UINT, kWebMIdAttachmentLink},
   {UINT, kWebMIdCodecDecodeAll},
   {UINT, kWebMIdTrackOverlay},
   {LIST, kWebMIdTrackTranslate},
   {LIST, kWebMIdVideo},
   {LIST, kWebMIdAudio},
   {LIST, kWebMIdTrackOperation},
   {LIST, kWebMIdContentEncodings},
 };
 
@@ skipping 761 matching lines @@
       if (kSegmentIds[i].id_ == id_b)
         return true;
     }
   }
 
   // kWebMIdSegment siblings.
   return ((id_b == kWebMIdSegment) || (id_b == kWebMIdEBMLHeader));
 }
 
 }  // namespace media