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New @func - pcm_args_by_class

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New 'pcm_args_by_class' @func available for using in configuration files.
Returns card, device args list formatted as "CARD=N,DEV=M" by specified
pcm class and index.

Signed-off-by: Sasha Khapyorsky <sashak@smlink.com>
This commit is contained in:
Sasha Khapyorsky 2005-09-29 11:46:59 +00:00 • committed by Takashi Iwai
parent 31595805b2
commit 74b5c3139b
1 changed files with 117 additions and 0 deletions
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117
src/confmisc.c
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@ -853,6 +853,123 @@ int snd_func_pcm_id(snd_config_t **dst, snd_config_t *root, snd_config_t *src, v
SND_DLSYM_BUILD_VERSION(snd_func_pcm_id, SND_CONFIG_DLSYM_VERSION_EVALUATE);
#endif
/**
* \brief Returns the pcm card and device arguments (in form CARD=N,DEV=M)
* for pcm specified by class and index.
* \param dst The function puts the handle to the result configuration node
* (with type string) at the address specified by \p dst.
* \param root Handle to the root source node.
* \param src Handle to the source node, with definitions for \c class
* and \c index.
* \param private_data Handle to the \c private_data node.
* \return A non-negative value if successful, otherwise a negative error code.
*
* Example:
\code
{
@func pcm_args_by_class
class 0
index 0
}
\endcode
*/
int snd_func_pcm_args_by_class(snd_config_t **dst, snd_config_t *root, snd_config_t *src, void *private_data)
{
snd_config_t *n;
snd_ctl_t *ctl = NULL;
snd_pcm_info_t *info;
const char *id;
int card = -1, dev;
long class, index;
int idx = 0;
int err;
err = snd_config_search(src, "class", &n);
if (err < 0) {
SNDERR("field class not found");
goto __out;
}
err = snd_config_evaluate(n, root, private_data, NULL);
if (err < 0) {
SNDERR("error evaluating class");
goto __out;
}
err = snd_config_get_integer(n, &class);
if (err < 0) {
SNDERR("field class is not an integer");
goto __out;
}
err = snd_config_search(src, "index", &n);
if (err < 0) {
SNDERR("field index not found");
goto __out;
}
err = snd_config_evaluate(n, root, private_data, NULL);
if (err < 0) {
SNDERR("error evaluating index");
goto __out;
}
err = snd_config_get_integer(n, &index);
if (err < 0) {
SNDERR("field index is not an integer");
goto __out;
}
snd_pcm_info_alloca(&info);
while(1) {
err = snd_card_next(&card);
if (err < 0) {
SNDERR("could not get next card");
goto __out;
}
if (card < 0)
break;
err = open_ctl(card, &ctl);
if (err < 0) {
SNDERR("could not open control for card %li", card);
goto __out;
}
dev = -1;
memset(info, 0, snd_pcm_info_sizeof());
while(1) {
err = snd_ctl_pcm_next_device(ctl, &dev);
if (err < 0) {
SNDERR("could not get next pcm for card %li", card);
goto __out;
}
if (dev < 0)
break;
snd_pcm_info_set_device(info, dev);
err = snd_ctl_pcm_info(ctl, info);
if (err < 0)
continue;
if (snd_pcm_info_get_class(info) == (snd_pcm_class_t)class &&
index == idx++)
goto __out;
}
snd_ctl_close(ctl);
ctl = NULL;
}
err = -ENODEV;
__out:
if (ctl)
snd_ctl_close(ctl);
if (err < 0)
return err;
if((err = snd_config_get_id(src, &id)) >= 0) {
char name[32], *s;
snprintf(name, sizeof(name), "CARD=%i,DEV=%i", card, dev);
if (!(s = strdup(name)))
return -ENOMEM;
err = snd_config_imake_string(dst, id, s);
}
return err;
}
#ifndef DOC_HIDDEN
SND_DLSYM_BUILD_VERSION(snd_func_pcm_args_by_class, SND_CONFIG_DLSYM_VERSION_EVALUATE);
#endif
/**
* \brief Returns the PCM subdevice from \c private_data.
* \param dst The function puts the handle to the result configuration node