// ____________________________________________________________________________________
// get sample rate of the default input device
OSStatus MyGetDefaultInputDeviceSampleRate(Float64 *outSampleRate)
{
OSStatus err;
AudioDeviceID deviceID = 0;
// get the default input device
AudioObjectPropertyAddress addr;
UInt32 size;
addr.mSelector = kAudioHardwarePropertyDefaultInputDevice;
addr.mScope = kAudioObjectPropertyScopeGlobal;
addr.mElement = 0;
size = sizeof(AudioDeviceID);
#if USE_AUDIO_SERVICES
err = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject, &addr, 0, NULL, &size, &deviceID);
#else
err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &addr, 0, NULL, &size, &deviceID);
#endif
if (err) return err;
// get its sample rate
addr.mSelector = kAudioDevicePropertyNominalSampleRate;
addr.mScope = kAudioObjectPropertyScopeGlobal;
addr.mElement = 0;
size = sizeof(Float64);
#if USE_AUDIO_SERVICES
err = AudioHardwareServiceGetPropertyData(deviceID, &addr, 0, NULL, &size, outSampleRate);
#else
err = AudioObjectGetPropertyData(deviceID, &addr, 0, NULL, &size, outSampleRate);
#endif
return err;
}
AudioDeviceID defaultOutputDeviceID() {
AudioDeviceID outputDeviceID = kAudioObjectUnknown;
// get output device device
UInt32 propertySize = 0;
OSStatus status = noErr;
AudioObjectPropertyAddress propertyAOPA;
propertyAOPA.mScope = kAudioObjectPropertyScopeGlobal;
propertyAOPA.mElement = kAudioObjectPropertyElementMaster;
propertyAOPA.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
if (!AudioHardwareServiceHasProperty(kAudioObjectSystemObject, &propertyAOPA)) {
fprintf(stderr, "ERROR: Cannot find default output device!\n");
return outputDeviceID;
}
propertySize = sizeof(AudioDeviceID);
status = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject, &propertyAOPA, 0, NULL, &propertySize, &outputDeviceID);
if (status) {
fprintf(stderr, "ERROR: Cannot find default output device!\n");
}
return outputDeviceID;
}
// static
OSStatus BGMDeviceControlSync::AHSGetPropertyData(AudioObjectID inObjectID, const AudioObjectPropertyAddress* inAddress, UInt32* ioDataSize, void* outData)
{
// The docs for AudioHardwareServiceGetPropertyData specifically allow passing NULL for inQualifierData as we do here,
// but it's declared in an assume_nonnull section so we have to disable the warning here. I'm not sure why inQualifierData
// isn't __nullable. I'm assuming it's either a backwards compatibility thing or just a bug.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wnonnull"
// The non-depreciated version of this (and the setter below) doesn't seem to support devices other than the default
return AudioHardwareServiceGetPropertyData(inObjectID, inAddress, 0, NULL, ioDataSize, outData);
#pragma clang diagnostic pop
}
OSStatus MyGetDefaultInputDeviceSampleRate(Float64 *outSampleRate)
{
OSStatus error;
AudioObjectPropertyAddress propertyAddress;
UInt32 propertySize;
propertyAddress.mSelector = kAudioHardwarePropertyDefaultInputDevice;
propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
propertyAddress.mElement = 0;
propertySize = sizeof(AudioDeviceID);
error = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject, &propertyAddress, 0, NULL, &propertySize, outSampleRate);
return error;
}
bool isMuted()
{
UInt32 muted = 0;
if (outputDeviceID != kAudioObjectUnknown)
{
UInt32 size = sizeof (muted);
AudioHardwareServiceGetPropertyData (outputDeviceID, &addr,
0, nullptr, &size, &muted);
}
return muted != 0;
}
float getGain()
{
Float32 gain = 0;
if (outputDeviceID != kAudioObjectUnknown)
{
UInt32 size = sizeof (gain);
AudioHardwareServiceGetPropertyData (outputDeviceID, &addr,
0, nullptr, &size, &gain);
}
return (float) gain;
}
// get sample rate of the default input device
OSStatus MyGetDefaultInputDeviceSampleRate(Float64 *outSampleRate)
{
OSStatus error;
AudioDeviceID deviceID = 0;
// get the default input device
AudioObjectPropertyAddress propertyAddress;
UInt32 propertySize;
propertyAddress.mSelector = kAudioHardwarePropertyDefaultInputDevice;
propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
propertyAddress.mElement = 0;
propertySize = sizeof(AudioDeviceID);
error = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject, &propertyAddress, 0, NULL, &propertySize, &deviceID);
if (error) return error;
// get its sample rate
propertyAddress.mSelector = kAudioDevicePropertyNominalSampleRate;
propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
propertyAddress.mElement = 0;
propertySize = sizeof(Float64);
error = AudioHardwareServiceGetPropertyData(deviceID, &propertyAddress, 0, NULL, &propertySize, outSampleRate);
return error;
}
SystemVol (AudioObjectPropertySelector selector)
: outputDeviceID (kAudioObjectUnknown)
{
addr.mScope = kAudioObjectPropertyScopeGlobal;
addr.mElement = kAudioObjectPropertyElementMaster;
addr.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
if (AudioHardwareServiceHasProperty (kAudioObjectSystemObject, &addr))
{
UInt32 deviceIDSize = sizeof (outputDeviceID);
OSStatus status = AudioHardwareServiceGetPropertyData (kAudioObjectSystemObject, &addr, 0,
nullptr, &deviceIDSize, &outputDeviceID);
if (status == noErr)
{
addr.mElement = kAudioObjectPropertyElementMaster;
addr.mSelector = selector;
addr.mScope = kAudioDevicePropertyScopeOutput;
if (! AudioHardwareServiceHasProperty (outputDeviceID, &addr))
outputDeviceID = kAudioObjectUnknown;
}
}
}
