# Listen for audio events

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The Video SDK for macOS fires audio-related callbacks through `ZMVideoSDKDelegate`. Conform to the delegate and implement the callbacks below to react to audio state changes. If you haven't already set up a delegate, see [Integrate](/docs/video-sdk/macos/integrate/#implement-a-delegate).

## Get notified when a user's audio status has changed

`onUserAudioStatusChanged` fires when a user mutes, unmutes, connects, or disconnects audio.

```swift
func onUserAudioStatusChanged(_ audioHelper: ZMVideoSDKAudioHelper!, userList userArray: [ZMVideoSDKUser]!) {
    // userArray contains the users that had an audio status change.
    if let userArray = userArray {
        for user in userArray {
            // Use to check if a user's audio is muted.
            // If true, the user is muted. If false, the user is unmuted.
            if ((user.getAudioStatus().isMuted) == true) {
                // User's audio is muted.
            }
            // Use to obtain a certain user's audio type.
            if let audioType = user.getAudioStatus()?.audioType {
                print("User has audio type: \(audioType)")
            }
        }
    }
}
```

```objectivec
- (void)onUserAudioStatusChanged:(ZMVideoSDKAudioHelper*)audioHelper userList:(NSArray*)userArray {
    // userArray contains the users that had an audio status change.
    for (int i = 0; i < userArray.count; i++) {
        if (userArray[i]) {
            // Use to check if a user's audio is muted.
            // If true, the user is muted. If false, the user is unmuted.
            if ([userArray[i] getAudioStatus].isMuted) {
                // User's audio is muted.
            }
            // Use to obtain a certain user's audio type.
            NSLog(@"User has audio type: %lu", [userArray[i] getAudioStatus].audioType);
        }
    }
}
```

## Get notified when a user's active audio changes

`onUserActiveAudioChanged` is different from `onUserAudioStatusChanged`. The SDK calls `onUserActiveAudioChanged` when a given user's audio changes; it calls `onUserAudioStatusChanged` when the user's audio status changes.

For example, if the user is unmuted and is using their device's microphone, `onUserActiveAudioChanged` is triggered whenever their microphone detects a noise.

```swift
func onUserActiveAudioChanged(_ audioHelper: ZMVideoSDKAudioHelper!, userList userArray: [ZMVideoSDKUser]!) {
    // userArray contains the users that had an active audio change.
    if let userArray = userArray {
        for user in userArray {
            // Use to see if the user is currently talking.
            if let audioStatus = user.getAudioStatus(), audioStatus.isTalking, let userName = user.getUserName() {
                print("\(userName) began talking.")
            }
        }
    }
}
```

```objectivec
- (void)onUserActiveAudioChanged:(ZMVideoSDKAudioHelper*)audioHelper userList:(NSArray*)userArray {
    // userArray contains the users that had an active audio change.
    for (int i = 0; i < userArray.count; i++) {
        if (userArray[i]) {
            // Use to see if the user is currently talking.
            if ([userArray[i] getAudioStatus].isTalking) {
                NSLog(@"%@ began talking.", userArray[i].getUserName);
            }
        }
    }
}
```