Avoid clicks when muting/unmuting a voe::Channel.

webrtc/modules/utility/include/audio_frame_operations.h

Index: webrtc/modules/utility/include/audio_frame_operations.h
diff --git a/webrtc/modules/utility/include/audio_frame_operations.h b/webrtc/modules/utility/include/audio_frame_operations.h
index 1551d8689422f50760ca5e5bcc53027bcfc22473..d34bb3efb00bab8b06efa7402834b847e3c12df1 100644
--- a/webrtc/modules/utility/include/audio_frame_operations.h
+++ b/webrtc/modules/utility/include/audio_frame_operations.h
@@ -46,7 +46,7 @@ class AudioFrameOperations {
   static void SwapStereoChannels(AudioFrame* frame);
 
   // Zeros out the audio and sets |frame.energy| to zero.

[tlegrand-webrtc, 2016/03/23 13:42:41]

Is the function called both for mute and unmute? Change name?

The comment should be updated, saying something like "faded to/from zero"?

[the sun, 2016/03/23 14:25:59]

Done.

-  static void Mute(AudioFrame& frame);
+  static void Mute(AudioFrame* frame, bool start_muted, bool end_muted);

[peah-webrtc, 2016/03/23 15:57:04]

Please add documentation of the start_muted and end_muted parameters. To me
current names are quite general and a bit ambiguous and I think either clear
documentation, or other more describing variable names are needed.

[the sun, 2016/03/23 21:30:52]

I've renamed them and added documentation.

 
   static int Scale(float left, float right, AudioFrame& frame);