Re: QT 6.4, CoreAudio and USB devices
Re: QT 6.4, CoreAudio and USB devices
- Subject: Re: QT 6.4, CoreAudio and USB devices
- From: Jeff Moore <email@hidden>
- Date: Tue, 16 Dec 2003 11:51:52 -0800
On Dec 16, 2003, at 5:07 AM, Amon Tavor wrote:
Hello,
I'm using CoreAudio for capturing audio from USB devices. Since QT 6.4
it stopped working - my IOProc is never called! The same code works on
QT 6.3. It also works with other devices on QT 6.4, such as internal
mic or iSight, but not with USB devices, such as iMic or Telex. These
devices work on QT 6.4 using the Sequence Grabber (QuickTime) API, but
not through the CoreAudio API.
Has anyone encountered this?
If I had to guess, I'd say that you probably have code that isn't being
careful about what it passes to the "isInput" arguments to the various
AudioDevice routines. From the sound of things, you are doing input, so
you might want to check to see if you are passing false when you should
be passing true.
Does anyone know of any changes to the CoreAudio hardware interfacing
API in QT 6.4?
Installing QT 6.4 on a 10.2.x system will give you, for the most part,
the CoreAudio pieces that are in Panther.
Where can I find documentation or sample code for CoreAudio hardware
interfacing API?
All of our sample code is in /Developer/Examples/CoreAudio.
--
Jeff Moore
Core Audio
Apple
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