Re: [alsa-devel] What does snd_pcm_delay() actually return?

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.

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.

Jaroslav

----- Jaroslav Kysela perex@perex.cz Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc.