Allow MP4 parser to handle multiple audio and video tracks

media/formats/mp4/avc.cc

 // Copyright 2014 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/formats/mp4/avc.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 47 matching lines @@
   }
   NOTREACHED();
   return 0;
 }
 
 // static
 bool AVC::ConvertFrameToAnnexB(int length_size,
                                std::vector<uint8_t>* buffer,
                                std::vector<SubsampleEntry>* subsamples) {
   RCHECK(length_size == 1 || length_size == 2 || length_size == 4);
+  DVLOG(5) << __FUNCTION__ << " length_size=" << length_size
+           << " buffer->size()=" << buffer->size()
+           << " subsamples=" << (subsamples ? subsamples->size() : 0);
 
   if (length_size == 4)
     return ConvertAVCToAnnexBInPlaceForLengthSize4(buffer);
 
   std::vector<uint8_t> temp;
   temp.swap(*buffer);
   buffer->reserve(temp.size() + 32);
 
   size_t pos = 0;
   while (pos + length_size < temp.size()) {
@@ skipping 260 matching lines @@
     // count for that first subsample.
     RCHECK(AVC::InsertParamSetsAnnexB(*avc_config_, frame_buf, subsamples));
   }
 
   DCHECK(AVC::IsValidAnnexB(*frame_buf, *subsamples));
   return true;
 }
 
 }  // namespace mp4
 }  // namespace media