Added a new function snd_pcm_parse_control_id() for the user controls.
This can be used in external plugins, too.
+/**
+ * \file include/pcm_external.h
+ * \brief External PCM plugin SDK
+ * \author Takashi Iwai <tiwai@suse.de>
+ * \date 2005
+ *
+ * Extern PCM plugin SDK.
+ */
+
+/*
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
#ifndef __ALSA_PCM_EXTERNAL_H
#define __ALSA_PCM_EXTERNAL_H
#include "pcm.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \defgroup Plugin_SDK External PCM plugin SDK
+ * \{
+ */
+
#define SND_PCM_PLUGIN_ENTRY(name) _snd_pcm_##name##_open
#define SND_PCM_PLUGIN_SYMBOL(name) SND_DLSYM_BUILD_VERSION(SND_PCM_PLUGIN_ENTRY(name), SND_PCM_DLSYM_VERSION);
#include "pcm_ioplug.h"
#include "pcm_extplug.h"
+int snd_pcm_parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
+ int *cchannelsp, int *hwctlp);
+
+/** \} */
+
+#ifdef __cplusplus
+}
+#endif
+
#endif /* __ALSA_PCM_EXTERNAL_H */
return ((int(*)[2][2])linear_formats)[width][!!unsignd][!!big_endian];
}
}
+
+/**
+ * \brief Parse control element id from the config
+ * \param conf the config tree to parse
+ * \param ctl_id the pointer to store the resultant control element id
+ * \param cardp the pointer to store the card index
+ * \param cchannelsp the pointer to store the number of channels (optional)
+ * \param hwctlp the pointer to store the h/w control flag (optional)
+ * \return 0 if successful, or a negative error code
+ *
+ * This function parses the given config tree to retrieve the control element id
+ * and the card index. It's used by softvol. External PCM plugins can use this
+ * function for creating or assigining their controls.
+ *
+ * cchannelsp and hwctlp arguments are optional. Set NULL if not necessary.
+ */
+int snd_pcm_parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
+ int *cchannelsp, int *hwctlp)
+{
+ 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;
+
+ assert(ctl_id && cardp);
+
+ *cardp = -1;
+ if (cchannelsp)
+ *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) {
+ const char *ptr;
+ if ((err = snd_config_get_string(n, &ptr)) < 0) {
+ SNDERR("field %s is not a string", id);
+ goto _err;
+ }
+ if ((err = snd_config_get_ctl_iface_ascii(ptr)) < 0) {
+ SNDERR("Invalid value for '%s'", id);
+ 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 (cchannelsp && 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;
+ }
+ if (hwctlp && strcmp(id, "hwctl") == 0) {
+ if ((err = snd_config_get_bool(n)) < 0) {
+ SNDERR("The field %s must be a boolean type", id);
+ return err;
+ }
+ *hwctlp = err;
+ 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;
+}
0xdbd5, 0xe0ab, 0xe59c, 0xeaa9, 0xefd3, 0xf519, 0xfa7d, 0xffff,
};
-#endif /* DOC_HIDDEN */
-
/* (32bit x 16bit) >> 16 */
typedef union {
int i;
/* (16bit x 16bit) >> 16 */
#define MULTI_DIV_short(src,scale) (((int)(src) * (scale)) >> VOL_SCALE_SHIFT)
+#endif /* DOC_HIDDEN */
/*
* apply volumue attenuation
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
}
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
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;
}
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