setting microphone gain
setting microphone gain
- Subject: setting microphone gain
- From: Matthew Johnson <email@hidden>
- Date: Wed, 27 Mar 2002 18:17:02 +1100
Hi,
I am trying to set the gain for my default input device. I can set the volume of the output Device and this work (if i
have daisy running I can see the volume sliders move. Works perfect.) as soon as I try to change the gain to any number
at all channel 1 in daisy does not change but channel 2 gets set to 0.0 and no matter what i set the gain to be it does
not move from 0. Can anyone tell me what i am missing?
Here is the code i use to set microphone gain.
float theValue=x; //x is a float between 0.0 and 1.0
for (channel=1; channel<3; channel++)
{
int datasize = sizeof(theValue);
Boolean isWritable;
err=0;
err = AudioDeviceGetPropertyInfo(inputAudioDevice, channel, true, kAudioDevicePropertyVolumeScalar,
NULL, &isWritable);
if(err==kAudioHardwareNoError && isWritable)
{
if((err = AudioDeviceSetProperty(inputAudioDevice, 0, channel, true,
kAudioDevicePropertyVolumeScalar, datasize, &theValue))!=kAudioHardwareNoError)
fprintf(stderr,"Set error[%d] %ld\n",channel,err);
}
else
fprintf(stderr,"Get error[%d] %ld\n",channel,err);
}
thanks
Matt
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