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noise on remote IO

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noise on remote IO

Subject: noise on remote IO
From: Denise Eatherly <email@hidden>
Date: Mon, 30 Nov 2009 10:43:07 -0700

Hi,

I am working on an app with a karaoke component. It uses audio units. Naturally, it works fine on the simulator -- but on the device I get really high-pitched noise when I am recording. Both the original song and the recording are going through the mixer. Each is handled in its own callback function.

For the recording, basically it just picks up the input from the mic:

OSStatus err = AudioUnitRender(amState->remoteIOUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, ioData);

then copy the contents of ioData to another buffer that I write to a file. Even if I comment out the part that copies the contents and writes to the output file, the noise is still present.

Any suggestions would be greatly appreciated.

Thanks,

Denise

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