Experiment with more aggressive MSE GC on memory pressure

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 <stddef.h>
 #include <stdint.h>
 
 #include <deque>
 #include <map>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/memory_pressure_listener.h"
 #include "base/synchronization/lock.h"
 #include "media/base/byte_queue.h"
 #include "media/base/demuxer.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_tracks.h"
 #include "media/base/ranges.h"
 #include "media/base/stream_parser.h"
 #include "media/filters/source_buffer_state.h"
 #include "media/filters/source_buffer_stream.h"
 
@@ skipping 30 matching lines @@
   // 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, size_t newDataSize);
 
+  void OnMemoryPressure(
+      DecodeTimestamp media_time,
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
+      bool force_gc);

[DaleCurtis, 2017/01/27 00:58:23]

s/force_gc/force_instant_gc/ since technically the method always forces gc.

[servolk, 2017/01/27 01:16:17]

Done.

+
   // 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 highest PTS of the buffered data.
   // Returns base::TimeDelta() if the stream has no buffered data.
   base::TimeDelta GetHighestPresentationTimestamp() const;
 
@@ skipping 184 matching lines @@
               base::TimeDelta end);
 
   // 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(const std::string& id,
                         base::TimeDelta currentMediaTime,
                         size_t newDataSize);
 
+  void OnMemoryPressure(
+      base::TimeDelta currentMediaTime,
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
+      bool force_gc);
+
   // 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 158 matching lines @@
   int detected_text_track_count_;
 
   std::map<MediaTrack::Id, DemuxerStream*> track_id_to_demux_stream_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_H_