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alsa-udev: support alsa.use-ucm

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Make a new alsa.use-ucm option that sets api.alsa.use-ucm on the device
it creates (when set).

There is some documentation floating around (thr arch wiki) with this
property.

See #4755
This commit is contained in:
Wim Taymans 2025-06-17 12:54:39 +02:00
parent 58aab3e16b
commit f2905c74ed
1 changed files with 8 additions and 1 deletions
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9
spa/plugins/alsa/alsa-udev.c
View file

@ -94,6 +94,7 @@ struct impl {
struct spa_source notify;
unsigned int use_acp:1;
unsigned int expose_busy:1;
int use_ucm;
};
static int impl_udev_open(struct impl *this)
@ -500,7 +501,7 @@ static int emit_added_object_info(struct impl *this, struct card *card)
if (num_pcm_devices > 0) {
struct spa_device_object_info info;
char *cn = NULL, *cln = NULL;
struct spa_dict_item items[25];
struct spa_dict_item items[26];
unsigned int n_items = 0;
card->pcm_device_id = calc_pcm_device_id(card);
@ -521,6 +522,9 @@ static int emit_added_object_info(struct impl *this, struct card *card)
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_ENUM_API, "udev");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_API, "alsa");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Audio/Device");
if (this->use_ucm != -1)
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_API_ALSA_USE_UCM,
this->use_ucm ? "true" : "false");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_API_ALSA_PATH, path);
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_API_ALSA_CARD, path+3);
if (snd_card_get_name(card->card_nr, &cn) >= 0)
@ -1105,6 +1109,7 @@ impl_init(const struct spa_handle_factory *factory,
alsa_log_topic_init(this->log);
this->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);
this->main_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_System);
this->use_ucm = -1;
if (this->main_loop == NULL) {
spa_log_error(this->log, "a main-loop is needed");
@ -1131,6 +1136,8 @@ impl_init(const struct spa_handle_factory *factory,
this->use_acp = spa_atob(str);
else if ((str = spa_dict_lookup(info, "alsa.udev.expose-busy")) != NULL)
this->expose_busy = spa_atob(str);
else if ((str = spa_dict_lookup(info, "alsa.use-ucm")) != NULL)
this->use_ucm = spa_atob(str) ? 1 : 0;
}
return 0;