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control: add _snd_ctl_open_child()

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To support internal plugins, add internal _snd_ctl_open_child()
function like _snd_pcm_open_slave().

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-03-29 12:19:21 +02:00
parent bb646ecb47
commit 7db7e18bbb
2 changed files with 39 additions and 6 deletions
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35
src/control/control.c
View file

@ -1469,20 +1469,44 @@ static int snd_ctl_open_conf(snd_ctl_t **ctlp, const char *name,
return err;
}
static int snd_ctl_open_noupdate(snd_ctl_t **ctlp, snd_config_t *root, const char *name, int mode)
static int snd_ctl_open_noupdate(snd_ctl_t **ctlp, snd_config_t *root,
const char *name, int mode, int hop)
{
int err;
snd_config_t *ctl_conf;
const char *str;
err = snd_config_search_definition(root, "ctl", name, &ctl_conf);
if (err < 0) {
SNDERR("Invalid CTL %s", name);
return err;
}
err = snd_ctl_open_conf(ctlp, name, root, ctl_conf, mode);
if (snd_config_get_string(ctl_conf, &str) >= 0)
err = snd_ctl_open_noupdate(ctlp, root, str, mode, hop + 1);
else {
snd_config_set_hop(ctl_conf, hop);
err = snd_ctl_open_conf(ctlp, name, root, ctl_conf, mode);
}
snd_config_delete(ctl_conf);
return err;
}
#ifndef DOC_HIDDEN
int _snd_ctl_open_named_child(snd_ctl_t **pctl, const char *name,
snd_config_t *root, snd_config_t *conf,
int mode, snd_config_t *parent_conf)
{
const char *str;
int hop;
if ((hop = snd_config_check_hop(parent_conf)) < 0)
return hop;
if (snd_config_get_string(conf, &str) >= 0)
return snd_ctl_open_noupdate(pctl, root, str, mode, hop + 1);
return snd_ctl_open_conf(pctl, name, root, conf, mode);
}
#endif
/**
* \brief Opens a CTL
* \param ctlp Returned CTL handle
@ -1499,7 +1523,7 @@ int snd_ctl_open(snd_ctl_t **ctlp, const char *name, int mode)
err = snd_config_update_ref(&top);
if (err < 0)
return err;
err = snd_ctl_open_noupdate(ctlp, top, name, mode);
err = snd_ctl_open_noupdate(ctlp, top, name, mode, 0);
snd_config_unref(top);
return err;
}
@ -1516,7 +1540,7 @@ int snd_ctl_open_lconf(snd_ctl_t **ctlp, const char *name,
int mode, snd_config_t *lconf)
{
assert(ctlp && name && lconf);
return snd_ctl_open_noupdate(ctlp, lconf, name, mode);
return snd_ctl_open_noupdate(ctlp, lconf, name, mode, 0);
}
/**
@ -1533,7 +1557,7 @@ int snd_ctl_open_fallback(snd_ctl_t **ctlp, snd_config_t *root,
{
int err;
assert(ctlp && name && root);
err = snd_ctl_open_noupdate(ctlp, root, name, mode);
err = snd_ctl_open_noupdate(ctlp, root, name, mode, 0);
if (err >= 0) {
free((*ctlp)->name);
(*ctlp)->name = orig_name ? strdup(orig_name) : NULL;
@ -3532,4 +3556,3 @@ void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec9
assert(obj && ptr);
memcpy(&obj->value.iec958, ptr, sizeof(obj->value.iec958));
}