Problems setting sample rate
Problems setting sample rate
- Subject: Problems setting sample rate
- From: "Rick Cohen" <email@hidden>
- Date: Thu, 18 May 2006 14:44:20 -0400
Hi folks,
I have a device here (Digidesign Mbox) that allows the user to set
their sample rate from its own control panel, which is called Digi
CoreAudio Manager. Never mind the fact that this is not available as
a control panel property, that is another subject :(
Anyway, I'm attempting to set the sample rate of my graph to 48000 if
the Mbox is already set to 48000, prior to launching my app. I'm able
to get that sample rate with the kAudioDevicePropertyNominalSampleRate
property on the Audio Device.
When I try to set the property on my output unit and my audio unit, I
am getting an error result of kAudioUnitErr_PropertyNotWritable
(-10865) when I initialize the graph.
RequireNoErr(AudioUnitSetProperty(
mOutputUnit,
kAudioUnitProperty_SampleRate,
kAudioUnitScope_Global,
0, // AudioUnitElement inElement,
&sampleRate,
sizeof(Float64)
));
RequireNoErr(AudioUnitSetProperty(
mTargetUnit, // AudioUnit ci,
kAudioUnitProperty_SampleRate,
kAudioUnitScope_Global,
0, // AudioUnitElement inElement,
&sampleRate,
sizeof(Float64)
));
result = AUGraphInitialize( mGraph );
Any suggestions would be helpful. Thanks!
- Rick
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