How to disable audio in webrtc mobile app(ios) without changing in framework

I am working with webrtc mobile(ios). I can't disable audio in webrtc(ios). I have got no flag to disable audio.By changing in framwork/library it can done easily. My purpose is that I have to disable audio without changing in framework/library. Can anyone help me?.

Update your question with code snippet, how you are creating mediaStrem or tracks(audio/video).

Generally with default Native WebRTC Framework,

RTCMediaStream localStream = [_factory mediaStreamWithStreamId:kARDMediaStreamId];
if(audioRequired) {
  RTCAudioTrack *aTrack = [_lmStream createLocalAudioTrack];
  [localStream addAudioTrack:aTrack];
}
RTCVideoTrack *vTrack = [_lmStream createLocalVideoTrack];
[localStream addVideoTrack:vTrack];
[_peerConnection addStream:localStream];

If you want to mute the Audio during the call, use below function.

- (void)enableAudio:(NSString *)id isAudioEnabled:(BOOL) isAudioEnabled {
  NSLog(@"Auido enabled: %d streams count:%d ", id, isAudioEnabled, _peerConnection.localStreams.count);
  if(_peerConnection.localStreams.count > 0) {
    RTCMediaStream *lStream = _peerConnection.localStreams[0];
    if(lStream.audioTracks.count > 0) { // Usually we will have only one track. If you have more than one, need to traverse all.
      // isAudioEnabled == 1 -> Unmute
      // isAudioEnabled == 0 -> Mute
      [lStream.audioTracks[0] setIsEnabled:isAudioEnabled];
    }
  }
}