[alsa-devel] how is 'dir' in snd_pcm_hw_params_set_periods_near() supposed to work?
mznyfn at 0pointer.de
Mon Sep 8 22:28:08 CEST 2008
How is the 'dir' argument in snd_pcm_hw_params_set_periods_near()
supposed to work?
I'd assume that passing dir=1 would mean that it is looked for a
number of periods that is greater *or equal* to what we request. If we
pass dir=-1 we'd be looking for a number of periods that is smaller
*or equal* to what we request.
However, what I am experiencing is that there is no "or equal". On my
softvol on hda setup here if I ask for 5 periods I will always get 6
if I pass dir=1 -- even if the could give me 5 and will give me five
if I pass dir=0.
The docs don't really elaborate on this much.
I'd certainly think that having ">=" and "<=" here is much more useful
and natural than ">" and "<", and hence I was wondering: is this just
a bug in the software or is it really intended to be this way?
Lennart Poettering Red Hat, Inc.
lennart [at] poettering [dot] net ICQ# 11060553
http://0pointer.net/lennart/ GnuPG 0x1A015CC4
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