how to use the buffer from sound card

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Hello!

I change the pcm.c program from alsa-lib/test, and capture the sound by asynchronic function with mmap. But when I edit recorded file I've got only dots like: ..................
When I open the file in aplay I have capture sound. How converts this 'dots' to normal value that I can use in my program?


Best wishes
Marek Michalak
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