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Hardware volume support in ALSA modules.

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@604 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Pierre Ossman 2006-02-26 17:57:58 +00:00
parent c5ec39d87f
commit b125e1c9d5
4 changed files with 322 additions and 0 deletions
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39
src/modules/alsa-util.c
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@ -128,3 +128,42 @@ void pa_free_io_events(pa_mainloop_api* m, pa_io_event **io_events, unsigned n_i
m->io_free(*ios);
pa_xfree(io_events);
}
int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
int err;
assert(mixer && dev);
if ((err = snd_mixer_attach(mixer, dev)) < 0) {
pa_log_warn(__FILE__": Unable to attach to mixer %s: %s", dev, snd_strerror(err));
return -1;
}
if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
pa_log_warn(__FILE__": Unable to register mixer: %s", snd_strerror(err));
return -1;
}
if ((err = snd_mixer_load(mixer)) < 0) {
pa_log_warn(__FILE__": Unable to load mixer: %s", snd_strerror(err));
return -1;
}
return 0;
}
snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name) {
snd_mixer_elem_t *elem;
snd_mixer_selem_id_t *sid;
snd_mixer_selem_id_alloca(&sid);
assert(mixer && name);
snd_mixer_selem_id_set_name(sid, name);
elem = snd_mixer_find_selem(mixer, sid);
if (!elem)
pa_log_warn(__FILE__": Cannot find mixer control %s", snd_mixer_selem_id_get_name(sid));
return elem;
}