Apple

Hi,

It appears that the call to AudioDeviceGetProperty with kAudioDevicePropertyClockDomain returns a different clock domain for the built-in audio device in compared with built-in audio device out.

Here’s a code example:

bool bRet = false;

UInt32 unSize = sizeof(UInt32);

UInt32 unClockDomainIn = 0;

UInt32 unClockDomainOut = 0;

// 1. Get clock domain of input device

OSStatus err = AudioDeviceGetProperty(inDevice->DeviceID(), 0, 0, kAudioDevicePropertyClockDomain, &unSize, &unClockDomainIn);

if(err)

{

// Some error handling here

}

// 2. Get clock domain of output device

err = AudioDeviceGetProperty(outDevice->DeviceID(), 0, 0, kAudioDevicePropertyClockDomain, &unSize, &unClockDomainOut);

if(err)

{

// Some error handling here

}

// 3. Compare the domains

if(unClockDomainIn == unClockDomainOut)

{

bRet = true;

}

return bRet;

Up to Mavericks, when comparing built-in audio device in to out, unClockDomainIn is equal to unClockDomainOut.

In Yosemite and El Capitan unClockDomainIn and unClockDomainOut are not the same.

What could be the problem here?

Thanks,

Oron

References:
	>kAudioDevicePropertyClockDomain of built in audio device changed starting Yosemite? (From: Oron Cherry <email@hidden>)