On Mar 9, 2007, at 4:09 PM, Michael Dautermann wrote:
Hi all,
The answer to this should be staring me in the face but it's
escaping my notice.
I'm putting together a new Audio Hardware plugin. I'm very
thankful for the JackRouter project (THANKS Stéphane!) but oh how I
wish there were more sample code & projects to rely on.
Under DeviceGetPropertyInfo, I set the size of the
kAudioDevicePropertyDeviceUID property to CFStringRef and for
DeviceGetProperty, I'm returning my device uid properly using:
this fails with a kAudioUnitErr_InvalidPropertyValue.
Does your device have input streams? Setting the above property will
fail if the device is not capable of capturing audio. The Sequence
Grabber determines this by querying it for its streams on the input
side.
Anyone have any ideas off the top of their head what I might be
missing?
p.s. as an aside, WhackedTV passes an NSString in for the UID and
that NSString's "sizeof" byte count doesn't match the byte count
for the [ NSString length ]. Should I be surprised this works for
Apple sample code?
NSStrings are toll free bridged to CFStringRefs. WhackedTV is
correct. The size to pass is the sizeof(NSString*), which is the
same as sizeof(CFStringRef). It's not the number of unichars in the
string.
-Brad Ford
QuickTime Engineering
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