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Code Issues Releases Wiki Activity

+ listener for changes of sytem volume

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known bug: sound not mutes at value 0.0
This commit is contained in:
ad 2018-04-13 21:27:59 +03:00
parent 115ea1372c
commit 621cb3242b
1 changed files with 40 additions and 3 deletions
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43
MTMR/VolumeViewController.swift
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@ -16,6 +16,39 @@ class VolumeViewController: NSCustomTouchBarItem {
} }
self.view = sliderItem self.view = sliderItem
var forPropertyAddress = AudioObjectPropertyAddress(
mSelector: kAudioHardwareServiceDeviceProperty_VirtualMasterVolume,
mScope: kAudioDevicePropertyScopeOutput,
mElement: kAudioObjectPropertyElementMaster)
addListenerBlock(listenerBlock: audioObjectPropertyListenerBlock,
onAudioObjectID: defaultDeviceID,
forPropertyAddress: &forPropertyAddress)
}
func addListenerBlock( listenerBlock: @escaping AudioObjectPropertyListenerBlock, onAudioObjectID: AudioObjectID, forPropertyAddress: UnsafePointer<AudioObjectPropertyAddress>) {
if (kAudioHardwareNoError != AudioObjectAddPropertyListenerBlock(onAudioObjectID, forPropertyAddress, nil, listenerBlock)) {
print("Error calling: AudioObjectAddPropertyListenerBlock") }
}
func audioObjectPropertyListenerBlock (numberAddresses: UInt32, addresses: UnsafePointer<AudioObjectPropertyAddress>) {
var index: UInt32 = 0
while index < numberAddresses {
let address: AudioObjectPropertyAddress = addresses[Int(index)]
switch address.mSelector {
case kAudioHardwareServiceDeviceProperty_VirtualMasterVolume:
DispatchQueue.main.async {
self.sliderItem.floatValue = self.getInputGain() * 100
}
default:
print("We didn't expect this!")
}
index += 1
}
} }
required init?(coder: NSCoder) { required init?(coder: NSCoder) {
@ -24,7 +57,7 @@ class VolumeViewController: NSCustomTouchBarItem {
@objc func sliderValueChanged(_ sender: Any) { @objc func sliderValueChanged(_ sender: Any) {
if let sliderItem = sender as? NSSlider { if let sliderItem = sender as? NSSlider {
setInputGain(Float32(sliderItem.intValue)/100.0) _ = setInputGain(Float32(sliderItem.intValue)/100.0)
} }
} }
@ -51,10 +84,14 @@ class VolumeViewController: NSCustomTouchBarItem {
} }
private func setInputGain(_ volume: Float32) -> OSStatus { private func setInputGain(_ volume: Float32) -> OSStatus {
var inputVolume: Float32 = volume var inputVolume: Float32 = volume //0.0 //roundf(volume * 100) / 100
let size: UInt32 = UInt32(MemoryLayout.size(ofValue: inputVolume)) let size: UInt32 = UInt32(MemoryLayout.size(ofValue: inputVolume))
var address: AudioObjectPropertyAddress = AudioObjectPropertyAddress() var address: AudioObjectPropertyAddress = AudioObjectPropertyAddress()
address.mSelector = AudioObjectPropertySelector(kAudioHardwareServiceDeviceProperty_VirtualMasterVolume) if inputVolume == 0.0 {
address.mSelector = AudioObjectPropertySelector(kAudioDevicePropertyMute)
} else {
address.mSelector = AudioObjectPropertySelector(kAudioHardwareServiceDeviceProperty_VirtualMasterVolume)
}
address.mScope = AudioObjectPropertyScope(kAudioDevicePropertyScopeOutput) address.mScope = AudioObjectPropertyScope(kAudioDevicePropertyScopeOutput)
address.mElement = AudioObjectPropertyElement(kAudioObjectPropertyElementMaster) address.mElement = AudioObjectPropertyElement(kAudioObjectPropertyElementMaster)
return AudioObjectSetPropertyData(defaultDeviceID, &address, 0, nil, size, &inputVolume) return AudioObjectSetPropertyData(defaultDeviceID, &address, 0, nil, size, &inputVolume)