Output Audio Devices
Output Audio Devices
- Subject: Output Audio Devices
- From: Lubor Prikryl <email@hidden>
- Date: Wed, 12 Nov 2003 23:15:15 +0200
Hi,
I tried to use output AU instead of CA callbacks, but there are some
goals I cannot reach.
- There is written in the new CoreAudio PDF, that we can connect to bus
0 of Output AU (OAU) for output and to bus 1 for input. But the Output
units have one output bus and one input bus, when asked for the
property.
- Well, and it is a mistake. They should have as many buses as the
physical device, e.g. G4 QS built in should have no input bus, or SPDIF
+ Analog MAudio Delta should have two in and two out buses. Shouldn't
they?
- I would like to pull audio from one device to another one. How can I
do that, when AUGraph supports up to one OAU? And mixer should pull
from two or more inputs of OAU devices as well.
- I tried to change the device for HAL or default OAU, calling
err = AudioUnitSetProperty (rtAU->mUnitComponent,
kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Output, 0,
&(allDevicesList[t]), dataSize);
allDevicesList is an array of devic IDs.
There is NO ERROR returned, but nothing happens.
- And the worst thing - input pulled from OAU does not work at all for
me. I connect a converter to OAU, set up the formats, the input of OAU
connects with noErr, when I connect output to the converter (OAU ->
converter-> effect -> OAU), there is noErr, too, starting up the unit,
application crashes in the audio rendering.
Do I need to prepare some buffers or so?
Thanks for help
Lubor Prikryl, DSound
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