audio: fix mute

Change-Id: I71fbb873a57eacb83a22474d88cc772c733ea38e

src/media/audio/audio_input.cpp

@@ -102,9 +102,8 @@ AudioInput::readFromDevice()
     if (not samples)
         return;
 
-    //if (muteState_) // audio is muted, set samples to 0
-    //    micData_.reset();
-    // TODO handle mute
+    if (muteState_)
+        libav_utils::fillWithSilence(samples->pointer());
 
     std::lock_guard<std::mutex> lk(fmtMutex_);
     if (bufferFormat != format_)

src/media/audio/audio_sender.cpp

@@ -113,6 +113,7 @@ void
 AudioSender::setMuted(bool isMuted)
 {
     muteState_ = isMuted;
+    audioInput_->setMuted(isMuted);
     audioEncoder_->setMuted(isMuted);
 }