Implement core of compliant MediaSource coded frame processing

content/renderer/media/websourcebuffer_impl.cc

 // Copyright 2013 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 "content/renderer/media/websourcebuffer_impl.h"
 
 #include <limits>
 
 #include "base/float_util.h"
 #include "media/filters/chunk_demuxer.h"
@@ skipping 84 matching lines @@
   DCHECK_GE(start, 0);
   DCHECK_GE(end, 0);
   demuxer_->Remove(id_, DoubleToTimeDelta(start), DoubleToTimeDelta(end));
 }
 
 bool WebSourceBufferImpl::setTimestampOffset(double offset) {
   if (demuxer_->IsParsingMediaSegment(id_))
     return false;
 
   timestamp_offset_ = DoubleToTimeDelta(offset);
+
+  // http://www.w3.org/TR/media-source/#widl-SourceBuffer-timestampOffset
+  // Step 6: If the mode attribute equals "sequence", then set the group start
+  // timestamp to new timestamp offset.
+  demuxer_->SetGroupStartTimestampIfInSequenceMode(id_, timestamp_offset_);
   return true;
 }
 
 void WebSourceBufferImpl::setAppendWindowStart(double start) {
   DCHECK_GE(start, 0);
   append_window_start_ = DoubleToTimeDelta(start);
 }
 
 void WebSourceBufferImpl::setAppendWindowEnd(double end) {
   DCHECK_GE(end, 0);
   append_window_end_ = DoubleToTimeDelta(end);
 }
 
 void WebSourceBufferImpl::removedFromMediaSource() {
   demuxer_->RemoveId(id_);
   demuxer_ = NULL;
 }
 
 }  // namespace content