On Fri, 13.06.08 15:55, Jaroslav Kysela (perex@xxxxxxxx) wrote: > On Fri, 13 Jun 2008, Lennart Poettering wrote: > > > c) snd_pcm_hw_params_get_buffer_size() - snd_pcm_update_avail() > > returns the fill level, but only works on mmap. > > snd_pcm_update_avail() works (or should work) also for standard r/w > ops. Ok, so it's just the documentation that needs fixing? Quoting: "Using of this function is useless for the standard read/write operations. Use it only for mmap access." > > d) The snd_pcm_hw_params_get_fifo_size() was supposed to return the > > 'difference' between a) and c), but was never actually used > > for that. > > Nope. It's maximum latency added by an extra fifo/queue (it does not > depend if it's hw or sw fifo). For variable fifo size, we need to extend > API. Ok, so it's an upper ceiling for the difference between a) and c), right? Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
