[alsa-devel] More snd_pcm_ioplug_avail_update() questions

Is it required that all available data has been committed between calls to snd_pcm_ioplug_avail_update() on an IO plugin capture stream?

If this is not a requirement then there can still be uncommitted data in the mmap after the current appl_ptr. This data will get overwritten by the transfer call.

If it is a requirement then snd_pcm_rate_avail_update() seems to be doing the wrong thing, because it only commits in units of the period size, which means that there could be a partial period left in the mmap.

Can someone clarify what the contract is for these calls?

Thanks,

Rob.