Cap the memory usage in FFMpegDemuxer.

media/filters/ffmpeg_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.
 
 // Implements the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 76 matching lines @@
   // Returns the range of buffered data in this stream.
   Ranges<base::TimeDelta> GetBufferedRanges() const;
 
   // Returns elapsed time based on the already queued packets.
   // Used to determine stream duration when it's not known ahead of time.
   base::TimeDelta GetElapsedTime() const;
 
   // Returns true if this stream has capacity for additional data.
   bool HasAvailableCapacity();
 
+  // Returns the total buffer size FFMpegDemuxerStream is holding onto.
+  size_t MemoryUsage() const;
+
   TextKind GetTextKind() const;
 
   // Returns the value associated with |key| in the metadata for the avstream.
   // Returns an empty string if the key is not present.
   std::string GetMetadata(const char* key) const;
 
  private:
   friend class FFmpegDemuxerTest;
 
   // Runs |read_cb_| if present with the front of |buffer_queue_|, calling
@@ skipping 68 matching lines @@
   void ReadFrameIfNeeded();
   void OnReadFrameDone(ScopedAVPacket packet, int result);
 
   // DataSource callbacks during stopping.
   void OnDataSourceStopped(const base::Closure& callback);
 
   // Returns true iff any stream has additional capacity. Note that streams can
   // go over capacity depending on how the file is muxed.
   bool StreamsHaveAvailableCapacity();
 
+  // Returns true if the maximum allowed memory usage has been reached.
+  bool IsMaxMemoryUsageReached() const;
+
   // Signal all FFmpegDemuxerStreams that the stream has ended.
   void StreamHasEnded();
 
   // Called by |url_protocol_| whenever |data_source_| returns a read error.
   void OnDataSourceError();
 
   // Returns the stream from |streams_| that matches |type| as an
   // FFmpegDemuxerStream.
   FFmpegDemuxerStream* GetFFmpegStream(DemuxerStream::Type type) const;
 
@@ skipping 62 matching lines @@
   scoped_ptr<FFmpegGlue> glue_;
 
   const NeedKeyCB need_key_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_