Correct channel mask on android

media/audio/android/opensles_input.cc

Index: media/audio/android/opensles_input.cc
diff --git a/media/audio/android/opensles_input.cc b/media/audio/android/opensles_input.cc
index 3d0079efdd997e0a698f748fab69a4455332acdb..0df5bc1ca69d0dcd7197eca93e6259daaa9ae3ac 100644
--- a/media/audio/android/opensles_input.cc
+++ b/media/audio/android/opensles_input.cc
@@ -24,8 +24,13 @@ OpenSLESInputStream::OpenSLESInputStream(AudioManagerAndroid* audio_manager,
   format_.samplesPerSec = static_cast<SLuint32>(params.sample_rate() * 1000);
   format_.bitsPerSample = params.bits_per_sample();
   format_.containerSize = params.bits_per_sample();
-  format_.channelMask = SL_SPEAKER_FRONT_CENTER;
   format_.endianness = SL_BYTEORDER_LITTLEENDIAN;
+  if (format_.numChannels == 1)
+    format_.channelMask = SL_SPEAKER_FRONT_CENTER;
+  else if (format_.numChannels == 2)
+    format_.channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
+  else
+    NOTREACHED() << "Unsupported number of channels: " << format_.numChannels;
 
   buffer_size_bytes_ = params.GetBytesPerBuffer();