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Add snd_pcm_parse_control_id()

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Added a new function snd_pcm_parse_control_id() for the user controls.
This can be used in external plugins, too.
This commit is contained in:
Takashi Iwai 2005-03-09 11:57:54 +00:00
parent 227441b2c8
commit 73008debc3
3 changed files with 192 additions and 116 deletions
Download patch file Download diff file Expand all files Collapse all files

122
src/pcm/pcm_softvol.c
View file

@ -91,8 +91,6 @@ static unsigned short preset_dB_value[PRESET_RESOLUTION] = {
0xdbd5, 0xe0ab, 0xe59c, 0xeaa9, 0xefd3, 0xf519, 0xfa7d, 0xffff,
};
#endif /* DOC_HIDDEN */
/* (32bit x 16bit) >> 16 */
typedef union {
int i;
@ -118,6 +116,7 @@ static inline int MULTI_DIV_int(int a, unsigned short b)
/* (16bit x 16bit) >> 16 */
#define MULTI_DIV_short(src,scale) (((int)(src) * (scale)) >> VOL_SCALE_SHIFT)
#endif /* DOC_HIDDEN */
/*
* apply volumue attenuation
@ -662,118 +661,9 @@ int snd_pcm_softvol_open(snd_pcm_t **pcmp, const char *name,
return 0;
}
/*
* parse card index and id for the softvol control
*/
static int parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
int *cchannelsp)
{
snd_config_iterator_t i, next;
int iface = SND_CTL_ELEM_IFACE_MIXER;
const char *name = NULL;
long index = 0;
long device = -1;
long subdevice = -1;
int err;
*cardp = -1;
*cchannelsp = 2;
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "comment") == 0)
continue;
if (strcmp(id, "card") == 0) {
const char *str;
long v;
if ((err = snd_config_get_integer(n, &v)) < 0) {
if ((err = snd_config_get_string(n, &str)) < 0) {
SNDERR("Invalid field %s", id);
goto _err;
}
*cardp = snd_card_get_index(str);
if (*cardp < 0) {
SNDERR("Cannot get index for %s", str);
err = *cardp;
goto _err;
}
} else
*cardp = v;
continue;
}
if (strcmp(id, "iface") == 0 || strcmp(id, "interface") == 0) {
if ((err = snd_config_get_bool(n)) < 0)
goto _err;
iface = err;
continue;
}
if (strcmp(id, "name") == 0) {
if ((err = snd_config_get_string(n, &name)) < 0) {
SNDERR("field %s is not a string", id);
goto _err;
}
continue;
}
if (strcmp(id, "index") == 0) {
if ((err = snd_config_get_integer(n, &index)) < 0) {
SNDERR("field %s is not an integer", id);
goto _err;
}
continue;
}
if (strcmp(id, "device") == 0) {
if ((err = snd_config_get_integer(n, &device)) < 0) {
SNDERR("field %s is not an integer", id);
goto _err;
}
continue;
}
if (strcmp(id, "subdevice") == 0) {
if ((err = snd_config_get_integer(n, &subdevice)) < 0) {
SNDERR("field %s is not an integer", id);
goto _err;
}
continue;
}
if (strcmp(id, "count") == 0) {
long v;
if ((err = snd_config_get_integer(n, &v)) < 0) {
SNDERR("field %s is not an integer", id);
goto _err;
}
if (v < 1 || v > 2) {
SNDERR("Invalid count %ld", v);
goto _err;
}
*cchannelsp = v;
continue;
}
SNDERR("Unknown field %s", id);
return -EINVAL;
}
if (name == NULL) {
SNDERR("Missing control name");
err = -EINVAL;
goto _err;
}
if (device < 0)
device = 0;
if (subdevice < 0)
subdevice = 0;
snd_ctl_elem_id_set_interface(ctl_id, iface);
snd_ctl_elem_id_set_name(ctl_id, name);
snd_ctl_elem_id_set_index(ctl_id, index);
snd_ctl_elem_id_set_device(ctl_id, device);
snd_ctl_elem_id_set_subdevice(ctl_id, subdevice);
return 0;
_err:
return err;
}
/* in pcm_misc.c */
int snd_pcm_parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
int *cchannelsp, int *hwctlp);
/*! \page pcm_plugins
@ -802,7 +692,7 @@ pcm.name {
}
control {
name STR # control element id string
[card INT] # control card index
[card STR] # control card index
[iface STR] # interface of the element
[index INT] # index of the element
[device INT] # device number of the element
@ -919,7 +809,7 @@ int _snd_pcm_softvol_open(snd_pcm_t **pcmp, const char *name,
if (err < 0)
return err;
snd_ctl_elem_id_alloca(&ctl_id);
if ((err = parse_control_id(control, ctl_id, &card, &cchannels)) < 0) {
if ((err = snd_pcm_parse_control_id(control, ctl_id, &card, &cchannels, NULL)) < 0) {
snd_pcm_close(spcm);
return err;
}