device startup noise
device startup noise
- Subject: device startup noise
- From: Steven Spencer <email@hidden>
- Date: Fri, 07 Mar 2003 21:52:54 +0000
Hi, this is my first post on the list.
I hope someone might have come across the following problem before :
I am recording audio into memory (a 20MB buffer), but the first half to one and a half seconds of audio is garbled, as though the device needs time to get up to speed. The rest of the sound quality is fine. After the call to AudioDeviceStart, the kAudioDevicePropertyDeviceIsRunning notification must be received before data can be transferred in the IOProc.
Data is transferred when inInputTime->mSampleTime isn't zero, inInputData isn't null, inInputData->mNumberBuffers is greater than zero and the device is running.
If there is a number of frames that must be skipped before transferring data, is there a way to determine this.
My setup is a PowerBook G4 667MHz 512MB, OS 10.1.5, using an Edirol UA-1D (USB) for digital audio capture.
Thanks (in advance)
Steven Spencer
email@hidden
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