Piping AutoMuter interface through to ViE API

This is a piece of the AutoMuter effort. A second CL will follow containing modifications to the new API, and tests.

BUG=2436
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2331004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4899 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/vie_codec_impl.cc b/video_engine/vie_codec_impl.cc
index 61449db..bf845d9 100644
--- a/video_engine/vie_codec_impl.cc
+++ b/video_engine/vie_codec_impl.cc
@@ -715,6 +715,19 @@
   return vie_encoder->StopDebugRecording();
 }
 
+void ViECodecImpl::EnableAutoMuting(int video_channel, int threshold_bps,
+                                    int window_bps) {
+  ViEChannelManagerScoped cs(*(shared_data_->channel_manager()));
+  ViEEncoder* vie_encoder = cs.Encoder(video_channel);
+  if (!vie_encoder) {
+    WEBRTC_TRACE(kTraceError, kTraceVideo,
+                 ViEId(shared_data_->instance_id(), video_channel),
+                 "%s: No encoder %d", __FUNCTION__, video_channel);
+    return;
+  }
+  return vie_encoder->EnableAutoMuting(threshold_bps, window_bps);
+}
+
 bool ViECodecImpl::CodecValid(const VideoCodec& video_codec) {
   // Check pl_name matches codec_type.
   if (video_codec.codecType == kVideoCodecRED) {