Propagate muted info from VoE Channel to AudioConferenceMixer

webrtc/voice_engine/voe_external_media_impl.cc

Index: webrtc/voice_engine/voe_external_media_impl.cc
diff --git a/webrtc/voice_engine/voe_external_media_impl.cc b/webrtc/voice_engine/voe_external_media_impl.cc
index 7b2b6a00f1e1d8094724b64a87159733ba5f04ab..cae0715ced2da3af353f8784b2f4c11814da1a15 100644
--- a/webrtc/voice_engine/voe_external_media_impl.cc
+++ b/webrtc/voice_engine/voe_external_media_impl.cc
@@ -153,7 +153,11 @@ int VoEExternalMediaImpl::GetAudioFrame(int channel, int desired_sample_rate_hz,
   }
   frame->sample_rate_hz_ =
       desired_sample_rate_hz == 0 ? -1 : desired_sample_rate_hz;
-  return channelPtr->GetAudioFrame(channel, frame);
+  auto ret = channelPtr->GetAudioFrameWithMuted(channel, frame);
+  if (ret == MixerParticipant::AudioFrameInfo::kMuted) {
+    frame->Mute();
+  }
+  return ret == MixerParticipant::AudioFrameInfo::kError ? -1 : 0;
 }
 
 int VoEExternalMediaImpl::SetExternalMixing(int channel, bool enable) {