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alsa-ucm: Make combination port names deterministic

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At the moment, port names combined from multiple devices are generated
based on the order that the devices are specified in config. This makes
programmatic use of thsee ports a bit painful, so let's make them be
combined in alphabetical order.
This commit is contained in:
Arun Raghavan 2013-08-21 14:58:06 +05:30
parent 4d638b5ffd
commit 3a3581758f
1 changed files with 17 additions and 3 deletions
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20
src/modules/alsa/alsa-ucm.c
View file

@ -664,6 +664,13 @@ int pa_alsa_ucm_get_verb(snd_use_case_mgr_t *uc_mgr, const char *verb_name, cons
return 0;
}
static int pa_alsa_ucm_device_cmp(const void *a, const void *b) {
const pa_alsa_ucm_device *d1 = *(pa_alsa_ucm_device **)a;
const pa_alsa_ucm_device *d2 = *(pa_alsa_ucm_device **)b;
return strcmp(pa_proplist_gets(d1->proplist, PA_ALSA_PROP_UCM_NAME), pa_proplist_gets(d2->proplist, PA_ALSA_PROP_UCM_NAME));
}
static void ucm_add_port_combination(
pa_hashmap *hash,
pa_alsa_ucm_mapping_context *context,
@ -681,9 +688,16 @@ static void ucm_add_port_combination(
char *name, *desc;
const char *dev_name;
const char *direction;
pa_alsa_ucm_device *dev;
pa_alsa_ucm_device *sorted[num], *dev;
dev = pdevices[0];
for (i = 0; i < num; i++)
sorted[i] = pdevices[i];
/* Sort by alphabetical order so as to have a deterministic naming scheme
* for combination ports */
qsort(&sorted[0], num, sizeof(pa_alsa_ucm_device *), pa_alsa_ucm_device_cmp);
dev = sorted[0];
dev_name = pa_proplist_gets(dev->proplist, PA_ALSA_PROP_UCM_NAME);
name = pa_sprintf_malloc("%s%s", is_sink ? PA_UCM_PRE_TAG_OUTPUT : PA_UCM_PRE_TAG_INPUT, dev_name);
@ -696,7 +710,7 @@ static void ucm_add_port_combination(
for (i = 1; i < num; i++) {
char *tmp;
dev = pdevices[i];
dev = sorted[i];
dev_name = pa_proplist_gets(dev->proplist, PA_ALSA_PROP_UCM_NAME);
tmp = pa_sprintf_malloc("%s+%s", name, dev_name);