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How to know whether the data is ready or not while reading from soundcard

Hi, all,

In the Core Audio documentation, on AudioDeviceIOProc, it said that:
"This is a client-supplied routine that the hardware calls to perform an I/O transaction for a given device. All input and output is presented to the client simultaneously for processing."

From the example HALPlayFile, I understood that in order to playing some stored music file, we have to fill the outOutputData buffer of AudioDeviceIOProc. My question is that, how can I know the data is ready from the soundcard while I want to read from the soundcard, say, recording the voice? How to differeniate the silence and the real voice?

Thanks for help,

kaiduan

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