Chrome-side implementation of media source timestamp offset

media/webm/webm_cluster_parser.h

 // 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.
 
 #ifndef MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_
 #define MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 22 matching lines @@
   //
   // Returns -1 if the parse fails.
   // Returns 0 if more data is needed.
   // Returns the number of bytes parsed on success.
   int Parse(const uint8* buf, int size);
 
   base::TimeDelta cluster_start_time() const { return cluster_start_time_; }
   const BufferQueue& audio_buffers() const { return audio_.buffers(); }
   const BufferQueue& video_buffers() const { return video_.buffers(); }
 
+  // Tells the parser to apply |offset| to the timestamp of the next buffers it
+  // parses.
+  void SetTimestampOffset(base::TimeDelta offset);
+
+  // Resets |timestamp_offset_|.
+  void ClearTimestampOffset();
+
  private:
   // Helper class that manages per-track state.
   class Track {
    public:
     explicit Track(int track_num);
     ~Track();
 
     int track_num() const { return track_num_; }
     const BufferQueue& buffers() const { return buffers_; }
 
@@ skipping 28 matching lines @@
   scoped_array<uint8> block_data_;
   int block_data_size_;
   int64 block_duration_;
 
   int64 cluster_timecode_;
   base::TimeDelta cluster_start_time_;
 
   Track audio_;
   Track video_;
 
+  // An offset to apply to the timestamp of each buffer.
+  base::TimeDelta timestamp_offset_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebMClusterParser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_