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