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Prefer mixer controls with volumes over switches

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When we look for a mixer control prefer controls that have both volume
and a mute switch over those that have only a volume switch over those
that only have a mute switch.

Originally pointed out by Adel Gadllah.
This commit is contained in:
Lennart Poettering 2009-01-08 01:03:42 +01:00
parent e67bc1d752
commit c2450501af
4 changed files with 75 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

80
src/modules/alsa-util.c
View file

@ -760,8 +760,32 @@ int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
return 0;
}
snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
snd_mixer_elem_t *elem;
static pa_bool_t elem_has_volume(snd_mixer_elem_t *elem, pa_bool_t playback) {
pa_assert(elem);
if (playback && snd_mixer_selem_has_playback_volume(elem))
return TRUE;
if (!playback && snd_mixer_selem_has_capture_volume(elem))
return TRUE;
return FALSE;
}
static pa_bool_t elem_has_switch(snd_mixer_elem_t *elem, pa_bool_t playback) {
pa_assert(elem);
if (playback && snd_mixer_selem_has_playback_switch(elem))
return TRUE;
if (!playback && snd_mixer_selem_has_capture_switch(elem))
return TRUE;
return FALSE;
}
snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback) {
snd_mixer_elem_t *elem = NULL, *fallback_elem = NULL;
snd_mixer_selem_id_t *sid = NULL;
snd_mixer_selem_id_alloca(&sid);
@ -771,17 +795,57 @@ snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const
snd_mixer_selem_id_set_name(sid, name);
if (!(elem = snd_mixer_find_selem(mixer, sid))) {
pa_log_info("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
if ((elem = snd_mixer_find_selem(mixer, sid))) {
if (fallback) {
snd_mixer_selem_id_set_name(sid, fallback);
if (elem_has_volume(elem, playback) &&
elem_has_switch(elem, playback))
goto success;
if (!(elem = snd_mixer_find_selem(mixer, sid)))
pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
if (!elem_has_volume(elem, playback) &&
!elem_has_switch(elem, playback))
elem = NULL;
}
pa_log_info("Cannot find mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
if (fallback) {
snd_mixer_selem_id_set_name(sid, fallback);
if ((fallback_elem = snd_mixer_find_selem(mixer, sid))) {
if (elem_has_volume(fallback_elem, playback) &&
elem_has_switch(fallback_elem, playback)) {
elem = fallback_elem;
goto success;
}
if (!elem_has_volume(fallback_elem, playback) &&
!elem_has_switch(fallback_elem, playback))
fallback_elem = NULL;
}
pa_log_warn("Cannot find fallback mixer control \"%s\" or mixer control is no combination of switch/volume.", snd_mixer_selem_id_get_name(sid));
}
if (elem && fallback_elem) {
/* Hmm, so we have both elements, but neither has both mute
* and volume. Let's prefer the one with the volume */
if (elem_has_volume(elem, playback))
goto success;
if (elem_has_volume(fallback_elem, playback)) {
elem = fallback_elem;
goto success;
}
}
if (!elem && fallback_elem)
elem = fallback_elem;
success:
if (elem)
pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));