Re: Programmatic Aggregate Device issue on Intel Mac, not always completing initialisation?
Re: Programmatic Aggregate Device issue on Intel Mac, not always completing initialisation?
- Subject: Re: Programmatic Aggregate Device issue on Intel Mac, not always completing initialisation?
- From: Dan <email@hidden>
- Date: Wed, 9 Jul 2008 16:39:14 +0100
2008/7/8 Jeff Moore <email@hidden>:
>
> On Jul 8, 2008, at 2:32 AM, Dan Stowell wrote:
>
>> 2008/7/7 Jeff Moore <email@hidden>:
>>> - You say that it works fine in the case where you are using two separate
>>> processes, but you get the problem when you are using a single process.
>>> Can
>>> you elaborate on what the differences are between the environments?
>>
>> I wish I could pin down the relevant differences for you.
>
> Not to belabor the obvious, but something has to be different. Given
> everything I've heard so far, figuring this out seems to me to be the most
> important thing you can do to learn about this problem. There's not much
> more I can do for you until you nail this down I think.
Absolutely.
>> OK, thanks. I added the following to the above code, at the point
>> marked "point at which to add the delay":
>>
>>
>> CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, false);
>> address.mSelector = kAudioHardwarePropertyDeviceForUID;
>> err = AudioObjectGetPropertyData(coreaudioPlugin, &address,
>> sizeof(CFStringRef), CFSTR("SCAggregate"), &aggregateSize,
>> &aggregateID);
>> if (err != kAudioHardwareNoError)
>> {
>> scprintf("get kAudioHardwarePropertyDeviceForUID error %s\n",
>> (char*)&err);
>> return false;
>> }
>>
>>
>> It results in the following error in all configurations:
>>
>> get kAudioHardwarePropertyDeviceForUID error ?ohw
>> so I guess I'm doing something wrong...? Thanks for any further advice.
>
> As it's name implies, kAudioHardwarePropertyDeviceForUID is a property of
> the system object, not the plug-in object. That's why you are getting the
> error here.
Thanks. Sorry to be dense, but I used "kAudioObjectSystemObject"
instead of "coreaudioPlugin" in the above and it must not be right
because it doesn't work - produces error "zis!". Does it need to be
written differently than:
err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &address,
sizeof(CFStringRef), CFSTR("SCAggregate"),
&aggregateSize, &aggregateID);
Thanks,
Dan
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