Improves stereo/mono audio support on Android

webrtc/modules/audio_device/android/audio_manager.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 85 matching lines @@
   // for the recoring side (i.e. using the android.media.AudioRecord API).
   bool IsAcousticEchoCancelerSupported() const;
   bool IsAutomaticGainControlSupported() const;
   bool IsNoiseSuppressorSupported() const;
 
   // Returns true if the device supports the low-latency audio paths in
   // combination with OpenSL ES.
   bool IsLowLatencyPlayoutSupported() const;
   bool IsLowLatencyRecordSupported() const;
 
+  // Returns true if the device supports (and has been configured for) stereo.
+  // Call the Java API WebRtcAudioManager.setStereoOutput/Input() with true as
+  // paramter to enable stereo. Default is mono in both directions and the
+  // setting is set once and for all when the audio manager object is created.
+  // TODO(henrika): stereo is not supported in combination with OpenSL ES.
+  bool IsStereoPlayoutSupported() const;
+  bool IsStereoRecordSupported() const;
+
   // Returns true if the device supports pro-audio features in combination with
   // OpenSL ES.
   bool IsProAudioSupported() const;
 
   // Returns the estimated total delay of this device. Unit is in milliseconds.
   // The vaule is set once at construction and never changes after that.
   // Possible values are webrtc::kLowLatencyModeDelayEstimateInMilliseconds and
   // webrtc::kHighLatencyModeDelayEstimateInMilliseconds.
   int GetDelayEstimateInMilliseconds() const;
 
@@ skipping 83 matching lines @@
   // Contains native parameters (e.g. sample rate, channel configuration).
   // Set at construction in OnCacheAudioParameters() which is called from
   // Java on the same thread as this object is created on.
   AudioParameters playout_parameters_;
   AudioParameters record_parameters_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_MANAGER_H_