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alsa-mixer: do the quick card number lookup to save mixer instances

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2019-12-08 22:48:45 +01:00 • committed by Arun Raghavan
parent 3ceff8bb3f
commit 8837c90b7f
2 changed files with 34 additions and 0 deletions
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1
src/modules/alsa/alsa-mixer.h
View file

@ -102,6 +102,7 @@ struct pa_alsa_setting {
/* An entry for one ALSA mixer */
struct pa_alsa_mixer {
snd_mixer_t *mixer_handle;
int card_index;
pa_alsa_fdlist *fdl;
bool used_for_probe_only:1;
};

33
src/modules/alsa/alsa-util.c
View file

@ -1737,11 +1737,33 @@ snd_mixer_t *pa_alsa_open_mixer_by_name(pa_hashmap *mixers, const char *dev, boo
int err;
snd_mixer_t *m;
pa_alsa_mixer *pm;
char *dev2;
void *state;
pa_assert(mixers);
pa_assert(dev);
pm = pa_hashmap_get(mixers, dev);
/* The quick card number/index lookup (hw:#)
* We already know the card number/index, thus use the mixer
* from the cache at first.
*/
if (!pm && pa_strneq(dev, "hw:", 3)) {
const char *s = dev + 3;
int card_index;
while (*s && *s >= 0 && *s <= '9') s++;
if (*s == '\0' && pa_atoi(dev + 3, &card_index) >= 0) {
PA_HASHMAP_FOREACH_KV(dev2, pm, mixers, state) {
if (pm->card_index == card_index) {
dev = dev2;
pm = pa_hashmap_get(mixers, dev);
break;
}
}
}
}
if (pm) {
if (!probe)
pm->used_for_probe_only = false;
@ -1756,6 +1778,17 @@ snd_mixer_t *pa_alsa_open_mixer_by_name(pa_hashmap *mixers, const char *dev, boo
if (prepare_mixer(m, dev) >= 0) {
pm = pa_xnew0(pa_alsa_mixer, 1);
if (pm) {
snd_hctl_t *hctl;
pm->card_index = -1;
/* determine the ALSA card number (index) and store it to card_index */
err = snd_mixer_get_hctl(m, dev, &hctl);
if (err >= 0) {
snd_ctl_card_info_t *info;
snd_ctl_card_info_alloca(&info);
err = snd_ctl_card_info(snd_hctl_ctl(hctl), info);
if (err >= 0)
pm->card_index = snd_ctl_card_info_get_card(info);
}
pm->used_for_probe_only = probe;
pm->mixer_handle = m;
pa_hashmap_put(mixers, pa_xstrdup(dev), pm);