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ucm: configuration - allow to define the configuration variables

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It may be useful for the library files to use the runtime configuration
variables.

Example:

 Define.Var1 "hw:${CardId},2"
 Value.PlaybackPCM "${var:Var1}"

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-05-20 19:04:36 +02:00
parent 6cc6024ac5
commit ed4567d1c9
5 changed files with 130 additions and 5 deletions
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51
src/ucm/utils.c
View file

@ -552,6 +552,56 @@ int uc_mgr_remove_device(struct use_case_verb *verb, const char *name)
return found == 0 ? -ENODEV : 0;
}
const char *uc_mgr_get_variable(snd_use_case_mgr_t *uc_mgr, const char *name)
{
struct list_head *pos;
struct ucm_value *value;
list_for_each(pos, &uc_mgr->variable_list) {
value = list_entry(pos, struct ucm_value, list);
if (strcmp(value->name, name) == 0)
return value->data;
}
return NULL;
}
int uc_mgr_set_variable(snd_use_case_mgr_t *uc_mgr, const char *name,
const char *val)
{
struct list_head *pos;
struct ucm_value *curr;
char *val2;
list_for_each(pos, &uc_mgr->variable_list) {
curr = list_entry(pos, struct ucm_value, list);
if (strcmp(curr->name, name) == 0) {
val2 = strdup(val);
if (val2 == NULL)
return -ENOMEM;
free(curr->data);
curr->data = val2;
return 0;
}
}
curr = calloc(1, sizeof(struct ucm_value));
if (curr == NULL)
return -ENOMEM;
curr->name = strdup(name);
if (curr->name == NULL) {
free(curr);
return -ENOMEM;
}
curr->data = strdup(val);
if (curr->data == NULL) {
free(curr->name);
free(curr);
return -ENOMEM;
}
list_add_tail(&curr->list, &uc_mgr->variable_list);
return 0;
}
void uc_mgr_free_verb(snd_use_case_mgr_t *uc_mgr)
{
struct list_head *pos, *npos;
@ -576,6 +626,7 @@ void uc_mgr_free_verb(snd_use_case_mgr_t *uc_mgr)
uc_mgr_free_sequence(&uc_mgr->once_list);
uc_mgr_free_sequence(&uc_mgr->default_list);
uc_mgr_free_value(&uc_mgr->value_list);
uc_mgr_free_value(&uc_mgr->variable_list);
free(uc_mgr->comment);
free(uc_mgr->conf_dir_name);
free(uc_mgr->conf_file_name);