Hello, I'm going to use the MMAP feature of ALSA. I understood I have to use snd_pcm_mmap_begin and snd_pcm_mmap_commit functions, but I can't understand the meaning of some parameters in the snd_pcm_mmap_begin function: when I call this function in order to have access to the capture stream on a call like this: err = snd_pcm_mmap_begin(capture, &c_area, &c_offset, &c_frames); it keeps to return c_frames = 0: is it right ? what does this mean? is the buffer full so that I can read samples or the available contiguous space to be read is 0? Thank you, Alberto -- Dr. Villa Alberto Sw Engineer SeleTech srl via Collodi, 8 20052 Monza (MI) tel: +39 039 5962000 fax: +39 039 9716905 email: a.villa@seletech.com web: www.seletech.com www.seletech.eu