Re: AudioQueue Device Problems
Re: AudioQueue Device Problems
- Subject: Re: AudioQueue Device Problems
- From: Doug Wyatt <email@hidden>
- Date: Thu, 9 Oct 2008 23:16:11 -0700
On Oct 9, 2008, at 13:06 , email@hidden wrote:
I have 4 USB AudioDevices from the same manufacturer (unknown) - see
the
end of the list:
Device: Built-in Line Input
UID: AppleHDAEngineInput:3
Device: Built-in Digital Input
UID: AppleHDAEngineInput:4
Device: Built-in Output
UID: AppleHDAEngineOutput:0
Device: Built-in Line Output
UID: AppleHDAEngineOutput:1
Device: Built-in Digital Output
UID: AppleHDAEngineOutput:2
Device: Unknown USB Audio Device
UID: AppleUSBAudioEngine:Unknown Manufacturer:Unknown USB Audio
Device:1d200000:1
Device: Unknown USB Audio Device
UID: AppleUSBAudioEngine:Unknown Manufacturer:Unknown USB Audio
Device:1d200000:2
Device: Unknown USB Audio Device
UID: AppleUSBAudioEngine:Unknown Manufacturer:Unknown USB Audio
Device:fd510000:1
Device: Unknown USB Audio Device
UID: AppleUSBAudioEngine:Unknown Manufacturer:Unknown USB Audio
Device:fd510000:2
Each gets a unique ID, but I can only use the devices that end with :1
If I try to select a device ending on :2 AudioQueueSetProperty fails:
AudioQueueSetProperty(myInfo.mQueue,
kAudioQueueProperty_CurrentDevice,
&uid, sizeof(CFStringRef));
OSStatus: -66680 (invalid Device)
That error is returned from SetProperty when the device has no streams
"in the same direction" as the queue (i.e. no output streams on a
device being assigned to an output queue).
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