[alsa-devel] Is there a way to figure out if the clocks of two snd_pcm_t's deviate? (snd_pcm_info_get_sync?)
mznyfn at 0pointer.de
Fri Sep 4 01:03:51 CEST 2009
I am looking for a way to find out whether the clocks of two
snd_pcm_t's are perfectly in sync and don't deviate (or only deviate
by a constant phase).
i.e. for real duplex devices that use the same crystal for input and
output this should tell me "Yes" for the playback snd_pcm_t tested
against the recording snd_pcm_t; and for all other, unrelated audio
devices it should return "No".
I found snd_pcm_info_get_sync() in the docs, but its documentation is
a bit terse, so I am wondering if this might be what I want. Is it?
Does this (untested) code snippet do what I hope it does?
in_sync = memcmp(&snd_pcm_info_get_sync(info_a), &snd_pcm_info_get_sync(info_b)) == 0;
Lennart Poettering Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/ GnuPG 0x1A015CC4
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