Use larger buffer sizes for lower power on Linux.

media/base/audio_hardware_config.h

 // Copyright (c) 2013 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_BASE_AUDIO_HARDWARE_CONFIG_H_
 #define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/audio_parameters.h"
@@ skipping 23 matching lines @@
   media::AudioParameters GetInputConfig() const;
   media::AudioParameters GetOutputConfig() const;
 
   // Allows callers to update the cached values for either input or output.  The
   // values are paired under the assumption that these values will only be set
   // after an input or output device change respectively.  Safe to call from
   // any thread.
   void UpdateInputConfig(const media::AudioParameters& input_params);
   void UpdateOutputConfig(const media::AudioParameters& output_params);
 
+  // For clients which don't need low latency, a larger buffer size should be
+  // used to save power and CPU resources.
+  int GetHighLatencyBufferSize() const;
+
  private:
   // Cached values; access is protected by |config_lock_|.
   mutable base::Lock config_lock_;
   media::AudioParameters input_params_;
   media::AudioParameters output_params_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_