Support (E)AC3 passthrough

media/filters/audio_renderer_algorithm.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.
 
 // AudioRendererAlgorithm buffers and transforms audio data. The owner of
 // this object provides audio data to the object through EnqueueBuffer() and
 // requests data from the buffer via FillBuffer().
 //
 // This class is *not* thread-safe. Calls to enqueue and retrieve data must be
 // locked if called from multiple threads.
@@ skipping 135 matching lines @@
   // after a |channel_mask_| change. May be called at anytime after a channel
   // mask has been specified.
   void CreateSearchWrappers();
 
   // Number of channels in audio stream.
   int channels_;
 
   // Sample rate of audio stream.
   int samples_per_second_;
 
+  // Is compressed audio output
+  bool is_bitstream_format_;
+
   // Buffered audio data.
   AudioBufferQueue audio_buffer_;
 
   // If muted, keep track of partial frames that should have been skipped over.
   double muted_partial_frame_;
 
   // How many frames to have in the queue before we report the queue is full.
   int capacity_;
 
   // Book keeping of the current time of generated audio, in frames. This
@@ skipping 70 matching lines @@
   // The initial and maximum capacity calculated by Initialize().
   int initial_capacity_;
   int max_capacity_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererAlgorithm);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_ALGORITHM_H_