question about audio samples 'from the past'

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Hi all,

I have a simple problem with my application using the alsa lib for audio but I cannot find

any simple and direct solution...

Is it possible to open a CAPTURE stream and get access to the 
last, say, 4 seconds of samples?
This means I want to open the capture 'now' and seek back to -4 
seconds and get all the samples
since then. This also means the kernel must read samples from the 
soundcard all the time.

Thanks for your answers,

giorgio




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