hi all. Is there have some limitation on the parameter size of the interface: snd_pcm_sframes_t snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)? should be the SIZE as any value ? For example, set the size < period_size, ok? does the parameter depend on the period_size? Thanks a lot. ---- BR zw