[alsa-devel] read function

Hi,

I am trying to understand how aloop interacts with alsa. I understand that the interface between alsa and a driver is an audio buffer and pointers, offsets inside this buffer. However, I can't discover where these pointers are being used. In pcm_lib.c I inserted some debug messages in read/write functions, but they are never called. My question is: how is that the snd_pcm_readi, for example, from libasound reaches the driver.

Thanks.