Ronald S. Bultje wrote:
> is it possible for me to get the cardnumber (and thereby the hw:N
> entry) for a given non-hw device (e.g. dspN, hw:N,M, dmix, ...)?
Try something like this:
/* Get the slave pcm of a pcm node. Caller must free the result. */
static snd_config_t *get_pcm_slave_pcm(snd_config_t *pcm)
{
snd_config_t *slave;
snd_config_t *result = NULL;
int free_slave = 0;
const char *str;
if (snd_config_search(pcm, "slave", &slave) < 0)
goto _exit;
if (snd_config_get_string(slave, &str) >= 0) {
if (snd_config_search_definition(snd_config, "pcm_slave", str, &slave)
< 0)
goto _exit;
free_slave = 1;
}
if (snd_config_get_type(slave) != SND_CONFIG_TYPE_COMPOUND)
goto _exit;
if (snd_config_search(slave, "pcm", &pcm) < 0)
goto _exit;
if (snd_config_get_string(pcm, &str) >= 0) {
if (snd_config_search_definition(snd_config, "pcm", str, &pcm) >= 0)
result = pcm;
} else {
/* always make a dynamic copy, because the caller frees it */
if (snd_config_copy(&pcm, pcm) >= 0)
result = pcm;
}
_exit:
if (free_slave)
snd_config_delete(slave);
return result;
}
/* Get the card number from a pcm node. Searches recursively. */
static int get_pcm_card(snd_config_t *pcm)
{
snd_config_t *slave_pcm;
snd_config_t *card_node;
long card;
if (snd_config_get_type(pcm) != SND_CONFIG_TYPE_COMPOUND)
return -1;
slave_pcm = get_pcm_slave_pcm(pcm);
if (slave_pcm) {
card = get_pcm_card(slave_pcm);
snd_config_delete(slave_pcm);
return card;
} else if (snd_config_search(pcm, "card", &card_node) >= 0) {
const char *str;
if (snd_config_get_integer(card_node, &card) >= 0)
return card;
if (snd_config_get_string(card_node, &str) >= 0)
return snd_card_get_index(str);
}
return -1;
}
/* Get the card number from a pcm device name. */
static int get_named_pcm_card(const char *pcm_name)
{
snd_config_t *pcm;
int card;
if (snd_config_update() < 0)
return -1;
if (snd_config_search_definition(snd_config, "pcm", pcm_name, &pcm) < 0)
return -1;
card = get_pcm_card(pcm);
snd_config_delete(pcm);
return card;
}
/* ... */
card = get_named_pcm_card(pcm_name);
if (card >= 0)
sprintf(ctl_name, "hw:CARD=%d", card);
else
/* unknown card */
HTH
Clemens
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