Using native sampling rate and optimal buffer size for audio on Android.

media/audio/android/audio_manager_android.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_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
 #define MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
 
 #include "base/android/jni_android.h"
 #include "media/audio/audio_manager_base.h"
 
@@ skipping 35 matching lines @@
   virtual ~AudioManagerAndroid();
 
   virtual AudioParameters GetPreferredOutputStreamParameters(
       const AudioParameters& input_params) OVERRIDE;
 
  private:
   void SetAudioMode(int mode);
   void RegisterHeadsetReceiver();
   void UnregisterHeadsetReceiver();
   int GetNativeOutputSampleRate();
+  int GetMinInputFrameSize(int rate, int channels);
+  int GetMinOutputFrameSize(int rate, int channels);
+  bool IsAudioLowLatencySupported();
+  int GetAudioLowLatencyFrameSize();
+  int GetOptimalOutputFrameSize(int sample_rate, int channels);
 
   // Java AudioManager instance.
   base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerAndroid);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_