input mixer mute mode

Author: hiroshihorie

modules/audio_device/audio_engine_device.h

@@ -104,7 +104,14 @@ extern NSString* const kAudioEngineInputMixerNodeKey;
 class AudioEngineDevice : public AudioDeviceModule, public AudioSessionObserver {
  public:
   enum RenderMode { Device = 0, Manual = 1 };
-  enum MuteMode { VoiceProcessing = 0, RestartEngine = 1 };
+  enum MuteMode {
+    // Mute input using voice processing
+    VoiceProcessing = 0,
+    // Mute by restarting engine
+    RestartEngine = 1,
+    // Mute input by muting the input mixer node
+    InputMixer = 2,
+  };
 
   // Represents the state of the audio engine, including input/output status,
   // rendering mode, and various configuration flags.

modules/audio_device/audio_engine_device.mm

@@ -1757,7 +1757,7 @@
       // Always unmute vp if restart mute mode.
       if (state.next.mute_mode == MuteMode::RestartEngine &&
           inputNode().voiceProcessingInputMuted) {
-        LOGI() << "setVoiceProcessingInputMuted: un-muting vp for restart mute mode";
+        LOGI() << "Update mute (voice processing) unmuting vp for restart engine mode";
         inputNode().voiceProcessingInputMuted = false;
       }
 
@@ -2028,7 +2028,7 @@
 
     // If disabling input, always unmute the voice-processing input mute.
     if (inputNode().voiceProcessingEnabled && inputNode().voiceProcessingInputMuted) {
-      LOGI() << "setVoiceProcessingInputMuted (stop-recording): " << 0;
+      LOGI() << "Update mute (voice processing) unmuting vp for stop-recording";
       inputNode().voiceProcessingInputMuted = false;
     }
 
@@ -2084,10 +2084,21 @@
   if (state.next.mute_mode == MuteMode::VoiceProcessing && state.next.IsInputEnabled() &&
       inputNode().voiceProcessingEnabled &&
       inputNode().voiceProcessingInputMuted != state.next.input_muted) {
-    LOGI() << "setVoiceProcessingInputMuted (runtime): " << state.next.input_muted;
+    LOGI() << "Update mute (voice processing) runtime update" << state.next.input_muted;
     inputNode().voiceProcessingInputMuted = state.next.input_muted;
   }
 
+  // Run-time mute toggling if mixer mute mode.
+  if (state.next.mute_mode == MuteMode::InputMixer && state.next.IsInputEnabled() &&
+      input_mixer_node_ != nil) {
+    // Only update if the volume has changed.
+    float mixer_volume = state.next.input_muted ? 0.0f : 1.0f;
+    if (input_mixer_node_.outputVolume != mixer_volume) {
+      LOGI() << "Update mute (input mixer) runtime update" << state.next.input_muted;
+      input_mixer_node_.outputVolume = mixer_volume;
+    }
+  }
+
 #if !TARGET_OS_TV
   if (state.next.IsInputEnabled() && inputNode().voiceProcessingEnabled &&
       (!state.prev.IsInputEnabled() ||

sdk/objc/api/peerconnection/RTCAudioDeviceModule.h

@@ -37,6 +37,7 @@ typedef NS_ENUM(NSInteger, RTCAudioEngineMuteMode) {
   RTCAudioEngineMuteModeUnknown = -1,
   RTCAudioEngineMuteModeVoiceProcessing = 0,
   RTCAudioEngineMuteModeRestartEngine = 1,
+  RTCAudioEngineMuteModeInputMixer = 2,
 };
 
 typedef struct {