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

webrtc/modules/audio_device/android/audio_track_jni.h

Index: webrtc/modules/audio_device/android/audio_track_jni.h
diff --git a/webrtc/modules/audio_device/android/audio_track_jni.h b/webrtc/modules/audio_device/android/audio_track_jni.h
index 2c78a5901c5cad77c64c1fc025c99aefb9625870..23dfe8eea355a41be711b012c8a37a7949be8c1d 100644
--- a/webrtc/modules/audio_device/android/audio_track_jni.h
+++ b/webrtc/modules/audio_device/android/audio_track_jni.h
@@ -139,6 +139,11 @@ class AudioTrackJni {
   // Example: 480 for 48000 Hz or 441 for 44100 Hz.
   size_t frames_per_buffer_;
 
+  // Number of bytes per audio frame assuming that all sampels are 16-bit linear
+  // PCM samples.
+  // Example: 4 bytes for stereo and 2 bytes for mono.
+  size_t bytes_per_frame_;

[magjed_webrtc, 2016/11/16 13:42:09]

Do we need to store this as a member variable, or can we call
'audio_parameters_.channels() * sizeof(int16_t)' when we need it instead?

[henrika_webrtc, 2016/11/16 13:56:38]

Done.

+
   bool initialized_;
 
   bool playing_;