Fix MSE GC, make it less aggressive, more spec-compliant

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 39 matching lines @@
   // 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);
 
+  // If the buffer is full, attempts to try to free up space, as specified in
+  // the "Coded Frame Eviction Algorithm" in the Media Source Extensions Spec.
+  // Returns false iff buffer is still full after running eviction.
+  // https://w3c.github.io/media-source/#sourcebuffer-coded-frame-eviction
+  bool EvictCodedFrames(DecodeTimestamp media_time);
+
   // Signal to the stream that duration has changed to |duration|.
   void OnSetDuration(base::TimeDelta duration);
 
   // Returns the range of buffered data in this stream, capped at |duration|.
   Ranges<base::TimeDelta> GetBufferedRanges(base::TimeDelta duration) const;
 
   // Returns the duration of the buffered data.
   // Returns base::TimeDelta() if the stream has no buffered data.
   base::TimeDelta GetBufferedDuration() const;
 
@@ skipping 167 matching lines @@
   void Abort(const std::string& id,
              base::TimeDelta append_window_start,
              base::TimeDelta append_window_end,
              base::TimeDelta* timestamp_offset);
 
   // Remove buffers between |start| and |end| for the source buffer
   // associated with |id|.
   void Remove(const std::string& id, base::TimeDelta start,
               base::TimeDelta end);
 
+  bool EvictCodedFrames(base::TimeDelta currentMediaTime);
+
   // Returns the current presentation duration.
   double GetDuration();
   double GetDuration_Locked();
 
   // Notifies the demuxer that the duration of the media has changed to
   // |duration|.
   void SetDuration(double duration);
 
   // Returns true if the source buffer associated with |id| is currently parsing
   // a media segment, or false otherwise.
@@ skipping 142 matching lines @@
 
   // 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_