Audio Controls

CometChat Calls SDK v5 — Audio Controls

Overview

Programmatically control the local microphone (mute/unmute) and switch audio input/output devices during an active call.

Key Imports

import { CometChatCalls } from '@cometchat/calls-sdk-javascript';

Implementation

Mute / Unmute

CometChatCalls.muteAudio();    // mute microphone
CometChatCalls.unmuteAudio();  // unmute microphone
CometChatCalls.toggleAudio();  // toggle mute state

Get Available Audio Devices

const audioInputs = CometChatCalls.getAudioInputDevices();   // microphones
const audioOutputs = CometChatCalls.getAudioOutputDevices(); // speakers/headphones

Get Current Device

const currentMic = CometChatCalls.getCurrentAudioInputDevice();
const currentSpeaker = CometChatCalls.getCurrentAudioOutputDevice();

Switch Audio Input (Microphone)

const devices = CometChatCalls.getAudioInputDevices();
CometChatCalls.setAudioInputDevice(devices[1].deviceId);

Switch Audio Output (Speaker)

const outputs = CometChatCalls.getAudioOutputDevices();
CometChatCalls.setAudioOutputDevice(outputs[0].deviceId);

Listen for Audio Events

CometChatCalls.addEventListener('onAudioMuted', () => {
  // Update mute button to "muted" state
});

CometChatCalls.addEventListener('onAudioUnMuted', () => {
  // Update mute button to "unmuted" state
});

CometChatCalls.addEventListener('onAudioInputDeviceChanged', (device) => {
  console.log('Mic switched to:', device.label);
});

CometChatCalls.addEventListener('onAudioOutputDeviceChanged', (device) => {
  console.log('Speaker switched to:', device.label);
});

CometChatCalls.addEventListener('onAudioInputDevicesChanged', (devices) => {
  // Device list changed (plugged/unplugged) — rebuild UI
});

CometChatCalls.addEventListener('onAudioOutputDevicesChanged', (devices) => {
  // Output device list changed — rebuild UI
});

Pre-select Device (Before Joining)

const sessionSettings: SessionSettings = {
  audioInputDeviceId: 'specific-device-id',
  audioOutputDeviceId: 'specific-output-id',
  startAudioMuted: true,  // join muted
};

Gotchas

• muteAudio() / unmuteAudio() only work during an active session
• Device lists return MediaDeviceInfo objects with deviceId, label, kind, groupId
• setAudioOutputDevice() may not work in all browsers (Safari has limited support)
• Device labels may be empty strings until the user grants microphone permission
• Use onAudioInputDevicesChanged to detect when devices are plugged/unplugged
• For voice calls, consider setting startAudioMuted: false as default