MSE: Log buffered audio splice generation to media-internals

media/filters/source_buffer_stream.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.
 
 // SourceBufferStream is a data structure that stores media Buffers in ranges.
 // Buffers can be appended out of presentation order. Buffers are retrieved by
 // seeking to the desired start point and calling GetNextBuffer(). Buffers are
 // returned in sequential presentation order.
 
 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_
@@ skipping 310 matching lines @@
   // Called by PrepareRangesForNextAppend() before pruning overlapped buffers to
   // generate a splice frame with a small portion of the overlapped buffers.  If
   // a splice frame is generated, the first buffer in |new_buffers| will have
   // its timestamps, duration, and fade out preroll updated.
   void GenerateSpliceFrame(const BufferQueue& new_buffers);
 
   // If |out_buffer| has splice buffers or preroll, sets |pending_buffer_|
   // appropriately and returns true.  Otherwise returns false.
   bool SetPendingBuffer(scoped_refptr<StreamParserBuffer>* out_buffer);
 
+  // Update |splice_stats_| and log the update to |media_log_|.
+  void LogSplice(double splice_duration);
+  void LogDegenerateSplice();
+
   // Used to report log messages that can help the web developer figure out what
   // is wrong with the content.
   scoped_refptr<MediaLog> media_log_;
 
   // List of disjoint buffered ranges, ordered by start time.
   RangeList ranges_;
 
   // Indicates which decoder config is being used by the decoder.
   // GetNextBuffer() is only allows to return buffers that have a
   // config ID that matches this index. If there is a mismatch then
@@ skipping 71 matching lines @@
   // Indicates which of the splice buffers in |splice_buffer_| should be
   // handled out next.
   size_t splice_buffers_index_;
 
   // Indicates that all buffers before |pending_buffer_| have been handed out.
   bool pending_buffers_complete_;
 
   // Indicates that splice frame generation is enabled.
   const bool splice_frames_enabled_;
 
+  // Buffered audio splice generation statistics for reporting to |media_log_|.
+  // TODO(wolenetz,chcunningham): Once multi-track audio is enabled, report
+  // these statistics per track.
+  MediaLog::AudioSpliceStatistics splice_stats_;
+
   DISALLOW_COPY_AND_ASSIGN(SourceBufferStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_