Adds stereo support for Java-based input and output audio on Android

webrtc/modules/audio_device/android/audio_common.h

 /*
  *  Copyright (c) 2013 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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_COMMON_H_
 #define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_COMMON_H_
 
 namespace webrtc {
 
 const int kDefaultSampleRate = 44100;
-const int kNumChannels = 1;
-// Number of bytes per audio frame.
-// Example: 16-bit PCM in mono => 1*(16/8)=2 [bytes/frame]
-const size_t kBytesPerFrame = kNumChannels * (16 / 8);
 // Delay estimates for the two different supported modes. These values are based
 // on real-time round-trip delay estimates on a large set of devices and they
 // are lower bounds since the filter length is 128 ms, so the AEC works for
 // delays in the range [50, ~170] ms and [150, ~270] ms. Note that, in most
 // cases, the lowest delay estimate will not be utilized since devices that
 // support low-latency output audio often supports HW AEC as well.
 const int kLowLatencyModeDelayEstimateInMilliseconds = 50;
 const int kHighLatencyModeDelayEstimateInMilliseconds = 150;
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_AUDIO_COMMON_H_