CODEWITHSUNDEEP
xcodemacoscocoaswiftaudio
Egghead
Egghead

Reputation: 7017

Check if system volume is muted

I'm Currently working on a small project, in which I need to check if the system volume is muted from the App Delegate.

As sound as the user mute's/unmute's the volume an function needs to be called.

I've found some things about AudioToolbox, but I can't seem to find anything that works.

Upvotes: 2

Views: 2253

Answers (1)

user1509623
user1509623

Reputation: 192

I know to look up if the default device is muted or not. First, you need to look up the 'default' audio device hardware ID. This can be done once and stored in your program.

    var propAddr = AudioObjectPropertyAddress(
        mSelector: AudioObjectPropertySelector(kAudioHardwarePropertyDefaultOutputDevice),
        mScope: AudioObjectPropertyScope(kAudioObjectPropertyScopeGlobal),
        mElement: AudioObjectPropertyElement(kAudioObjectPropertyElementMaster))

    var defaultAudioHardwareID : AudioDeviceID = 0
    var propSize = UInt32(sizeof(uint32))

    let status = AudioHardwareServiceGetPropertyData(AudioObjectID(kAudioObjectSystemObject), &propAddr, 0 , nil, &propSize, &defaultAudioHardwareID)

After that, you can look up if the device is muted.

    var propAddr = AudioObjectPropertyAddress(
        mSelector: AudioObjectPropertySelector(kAudioDevicePropertyMute),
        mScope: AudioObjectPropertyScope(kAudioObjectPropertyScopeOutput),
        mElement: AudioObjectPropertyElement(kAudioObjectPropertyElementMaster))

    var isMuted: uint32 = 0
    var propSize = UInt32(sizeof(uint32))

    let status = AudioHardwareServiceGetPropertyData(defaultAudioHardwareID, &propAddr, 0, nil, &propSize, &isMuted)


    if isMuted != 0 {
        // Do stuff here
        return;
    }

I don't know if there's a way to get a notification when the mute state changes or not.

Upvotes: 2

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