Introduce the playback time into the MSE garbage collection.

media/filters/chunk_demuxer.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_FILTERS_CHUNK_DEMUXER_H_
 #define MEDIA_FILTERS_CHUNK_DEMUXER_H_
 
 #include <deque>
 #include <map>
 #include <string>
@@ skipping 25 matching lines @@
   void CompletePendingReadIfPossible();
   void Shutdown();
 
   // SourceBufferStream manipulation methods.
   void Seek(base::TimeDelta time);
   bool IsSeekWaitingForData() const;
 
   // Add buffers to this stream.  Buffers are stored in SourceBufferStreams,
   // which handle ordering and overlap resolution.
   // Returns true if buffers were successfully added.
-  bool Append(const StreamParser::BufferQueue& buffers);
+  bool Append(const StreamParser::BufferQueue& buffers,
+              base::TimeDelta media_time);
 
   // Removes buffers between |start| and |end| according to the steps
   // in the "Coded Frame Removal Algorithm" in the Media Source
   // Extensions Spec.
   // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#sourcebuffer-coded-frame-removal
   //
   // |duration| is the current duration of the presentation. It is
   // required by the computation outlined in the spec.
   void Remove(base::TimeDelta start, base::TimeDelta end,
               base::TimeDelta duration);
@@ skipping 303 matching lines @@
   // TODO(wolenetz/acolwell): Protect against possible double-locking by first
   // releasing |lock_| before executing this callback. See
   // http://crbug.com/308226
   PipelineStatusCB seek_cb_;
 
   scoped_ptr<ChunkDemuxerStream> audio_;
   scoped_ptr<ChunkDemuxerStream> video_;
 
   base::TimeDelta duration_;
 
+  // Current media time used to prevent garbage collecting buffers
+  // between the media time and the source buffer read position.
+  base::TimeDelta media_time_;
+
   // The duration passed to the last SetDuration(). If
   // SetDuration() is never called or an AppendData() call or
   // a EndOfStream() call changes |duration_|, then this
   // variable is set to < 0 to indicate that the |duration_| represents
   // the actual duration instead of a user specified value.
   double user_specified_duration_;
 
   base::Time timeline_offset_;
   Liveness liveness_;
 
   typedef std::map<std::string, SourceState*> SourceStateMap;
   SourceStateMap source_state_map_;
 
   // Used to ensure that (1) config data matches the type and codec provided in
   // AddId(), (2) only 1 audio and 1 video sources are added, and (3) ids may be
   // removed with RemoveID() but can not be re-added (yet).
   std::string source_id_audio_;
   std::string source_id_video_;
 
   // Indicates that splice frame generation is enabled.
   const bool splice_frames_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_H_