Created
November 24, 2019 23:38
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os x: How to listen default audio input device volume.
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| private lazy var audioInputVolumeListener: AudioObjectPropertyListenerBlock = { | |
| return { _, _ in | |
| // report self.getDefaultAudioInputVolume() | |
| } | |
| }() | |
| private func listenDefaultAudioInputVolume() { | |
| var audioVolumeAddr = AudioObjectPropertyAddress( | |
| mSelector: kAudioHardwareServiceDeviceProperty_VirtualMasterVolume, | |
| mScope: kAudioObjectPropertyScopeInput, | |
| mElement: kAudioObjectPropertyElementMaster | |
| ) | |
| guard let audioInputDevice = getDefaultAudioInputDevice() else { | |
| return | |
| } | |
| let status = AudioObjectAddPropertyListenerBlock(AudioObjectID(audioInputDevice), | |
| &audioVolumeAddr, | |
| DispatchQueue.main, | |
| audioInputVolumeListener) | |
| if status != kAudioHardwareNoError { | |
| return | |
| } | |
| } |
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