NetEq: Implement muted output

webrtc/modules/audio_coding/acm2/acm_receiver.cc

Index: webrtc/modules/audio_coding/acm2/acm_receiver.cc
diff --git a/webrtc/modules/audio_coding/acm2/acm_receiver.cc b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
index f8bacf8dc7d4a97ad4d267bb23d6a9f7bab35c2b..09e06c1065dc4e0b543263f475d5c205c3800958 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receiver.cc
+++ b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
@@ -137,10 +137,12 @@ int AcmReceiver::GetAudio(int desired_freq_hz, AudioFrame* audio_frame) {
   // Accessing members, take the lock.
   rtc::CritScope lock(&crit_sect_);
 
-  if (neteq_->GetAudio(audio_frame) != NetEq::kOK) {
+  bool muted;
+  if (neteq_->GetAudio(audio_frame, &muted) != NetEq::kOK) {
     LOG(LERROR) << "AcmReceiver::GetAudio - NetEq Failed.";
     return -1;
   }
+  RTC_DCHECK(!muted);
 
   const int current_sample_rate_hz = neteq_->last_output_sample_rate_hz();