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alsa: rewrite mixer open/close, cache mixer accesses in probe

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The ALSA mixer can be opened multiple times (especially for UCM
in the probe). This adds a simple mixer cache to prevent
multiple open calls.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2019-12-07 20:39:21 +01:00 • committed by Arun Raghavan
parent 6438e5c46d
commit 3bd7c70c51
9 changed files with 177 additions and 151 deletions
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21
src/modules/alsa/alsa-source.c
View file

@ -93,6 +93,7 @@ struct userdata {
char *paths_dir;
pa_alsa_fdlist *mixer_fdl;
pa_alsa_mixer_pdata *mixer_pd;
pa_hashmap *mixers;
snd_mixer_t *mixer_handle;
pa_alsa_path_set *mixer_path_set;
pa_alsa_path *mixer_path;
@ -1794,13 +1795,16 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
if (!mapping && !element)
return;
u->mixers = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func,
NULL, (pa_free_cb_t) pa_alsa_mixer_free);
mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
if (mdev) {
u->mixer_handle = pa_alsa_open_mixer_by_name(mdev);
u->mixer_handle = pa_alsa_open_mixer_by_name(u->mixers, mdev, false);
} else {
u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->pcm_handle, &u->control_device);
u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->mixers, u->pcm_handle, false);
}
if (!mdev) {
if (!u->mixer_handle) {
pa_log_info("Failed to find a working mixer device.");
return;
}
@ -1827,10 +1831,9 @@ fail:
u->mixer_path = NULL;
}
if (u->mixer_handle) {
snd_mixer_close(u->mixer_handle);
u->mixer_handle = NULL;
}
u->mixer_handle = NULL;
pa_hashmap_free(u->mixers);
u->mixers = NULL;
}
static int setup_mixer(struct userdata *u, bool ignore_dB) {
@ -2403,8 +2406,8 @@ static void userdata_free(struct userdata *u) {
if (u->mixer_path && !u->mixer_path_set && !u->ucm_context)
pa_alsa_path_free(u->mixer_path);
if (u->mixer_handle)
snd_mixer_close(u->mixer_handle);
if (u->mixers)
pa_hashmap_free(u->mixers);
if (u->smoother)
pa_smoother_free(u->smoother);