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ucm: implement CardNumberByName substitution

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The syntax is ${CardNumberByName:CARDNAME[#INDEX]}.

The CARDNAME is the ALSA's soundcard name (short form).
The INDEX is the instance (0 = first, 1 = second etc.).

Example: ${CardNumberByName:HDA Intel PCH}
(which is identical to ${CardNumberByName:HDA Intel PCH#0})

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-06-18 16:20:21 +02:00
parent f0276cc0bd
commit 68d3cbfbc3
1 changed files with 33 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

46
src/ucm/ucm_subs.c
View file

@ -71,20 +71,23 @@ static char *rval_conf_name(snd_use_case_mgr_t *uc_mgr)
return NULL;
}
static char *rval_card_number(snd_use_case_mgr_t *uc_mgr)
static char *get_card_number(struct ctl_list *ctl_list)
{
struct ctl_list *ctl_list;
char num[16];
if (uc_mgr->conf_format < 3)
return NULL;
ctl_list = uc_mgr_get_master_ctl(uc_mgr);
if (ctl_list == NULL)
return strdup("");
snprintf(num, sizeof(num), "%i", snd_ctl_card_info_get_card(ctl_list->ctl_info));
return strdup(num);
}
static char *rval_card_number(snd_use_case_mgr_t *uc_mgr)
{
if (uc_mgr->conf_format < 3)
return NULL;
return get_card_number(uc_mgr_get_master_ctl(uc_mgr));
}
static char *rval_card_id(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
@ -135,17 +138,11 @@ static char *rval_card_components(snd_use_case_mgr_t *uc_mgr)
return strdup(snd_ctl_card_info_get_components(ctl_list->ctl_info));
}
static char *rval_card_id_by_name(snd_use_case_mgr_t *uc_mgr, const char *id)
static struct ctl_list *get_ctl_list_by_name(snd_use_case_mgr_t *uc_mgr, const char *id)
{
struct ctl_list *ctl_list;
char *name, *index;
long idx = 0;
if (uc_mgr->conf_format < 3) {
uc_error("CardIdByName substitution is supported in v3+ syntax");
return NULL;
}
name = alloca(strlen(id) + 1);
strcpy(name, id);
index = strchr(name, '#');
@ -154,7 +151,29 @@ static char *rval_card_id_by_name(snd_use_case_mgr_t *uc_mgr, const char *id)
if (safe_strtol(index + 1, &idx))
return NULL;
}
ctl_list = uc_mgr_get_ctl_by_name(uc_mgr, name, idx);
return uc_mgr_get_ctl_by_name(uc_mgr, name, idx);
}
static char *rval_card_number_by_name(snd_use_case_mgr_t *uc_mgr, const char *id)
{
if (uc_mgr->conf_format < 3) {
uc_error("CardNumberByName substitution is supported in v3+ syntax");
return NULL;
}
return get_card_number(get_ctl_list_by_name(uc_mgr, id));
}
static char *rval_card_id_by_name(snd_use_case_mgr_t *uc_mgr, const char *id)
{
struct ctl_list *ctl_list;
if (uc_mgr->conf_format < 3) {
uc_error("CardIdByName substitution is supported in v3+ syntax");
return NULL;
}
ctl_list = get_ctl_list_by_name(uc_mgr, id);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_id(ctl_list->ctl_info));
@ -298,6 +317,7 @@ __std:
MATCH_VARIABLE2(value, "${env:", rval_env);
MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
MATCH_VARIABLE2(value, "${var:", rval_var);
MATCH_VARIABLE2(value, "${CardNumberByName:", rval_card_number_by_name);
MATCH_VARIABLE2(value, "${CardIdByName:", rval_card_id_by_name);
__merr:
err = -EINVAL;