/**
- * \file <alsa/control.h>
+ * \file include/control.h
* \brief Application interface library for the ALSA driver
- * \author Jaroslav Kysela <perex@suse.cz>
+ * \author Jaroslav Kysela <perex@perex.cz>
* \author Abramo Bagnara <abramo@alsa-project.org>
* \author Takashi Iwai <tiwai@suse.de>
* \date 1998-2001
*
* Application interface library for the ALSA driver
- *
- *
+ */
+/*
* This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of
+ * 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 Library General Public License for more details.
+ * GNU Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* \defgroup Control Control Interface
* The control interface.
+ * See \ref control page for more details.
* \{
*/
/** CTL card info container */
typedef struct _snd_ctl_card_info snd_ctl_card_info_t;
-/** CTL element identificator container */
+/** CTL element identifier container */
typedef struct _snd_ctl_elem_id snd_ctl_elem_id_t;
-/** CTL element identificator list container */
+/** CTL element identifier list container */
typedef struct _snd_ctl_elem_list snd_ctl_elem_list_t;
/** CTL element info container */
SND_CTL_ELEM_TYPE_BYTES,
/** IEC958 (S/PDIF) setting content */
SND_CTL_ELEM_TYPE_IEC958,
- SND_CTL_ELEM_TYPE_LAST = SND_CTL_ELEM_TYPE_IEC958,
+ /** 64-bit integer contents */
+ SND_CTL_ELEM_TYPE_INTEGER64,
+ SND_CTL_ELEM_TYPE_LAST = SND_CTL_ELEM_TYPE_INTEGER64
} snd_ctl_elem_type_t;
/** CTL related interface */
SND_CTL_ELEM_IFACE_TIMER,
/** Sequencer */
SND_CTL_ELEM_IFACE_SEQUENCER,
- SND_CTL_ELEM_IFACE_LAST = SND_CTL_ELEM_IFACE_SEQUENCER,
+ SND_CTL_ELEM_IFACE_LAST = SND_CTL_ELEM_IFACE_SEQUENCER
} snd_ctl_elem_iface_t;
/** Event class */
typedef enum _snd_ctl_event_type {
/** Elements related event */
SND_CTL_EVENT_ELEM = 0,
- SND_CTL_EVENT_LAST = SND_CTL_EVENT_ELEM,
+ SND_CTL_EVENT_LAST = SND_CTL_EVENT_ELEM
}snd_ctl_event_type_t;
/** Element has been removed (Warning: test this first and if set don't
#define SND_CTL_EVENT_MASK_INFO (1<<1)
/** Element has been added \hideinitializer */
#define SND_CTL_EVENT_MASK_ADD (1<<2)
+/** Element's TLV value has been changed \hideinitializer */
+#define SND_CTL_EVENT_MASK_TLV (1<<3)
/** CTL name helper */
#define SND_CTL_NAME_NONE ""
/** ACPI/PCI Power State D3cold */
#define SND_CTL_POWER_D3cold (SND_CTL_POWER_D3|0x0001)
+/** TLV type - Container */
+#define SND_CTL_TLVT_CONTAINER 0x0000
+/** TLV type - basic dB scale */
+#define SND_CTL_TLVT_DB_SCALE 0x0001
+/** TLV type - linear volume */
+#define SND_CTL_TLVT_DB_LINEAR 0x0002
+/** TLV type - dB range container */
+#define SND_CTL_TLVT_DB_RANGE 0x0003
+/** TLV type - dB scale specified by min/max values */
+#define SND_CTL_TLVT_DB_MINMAX 0x0004
+/** TLV type - dB scale specified by min/max values (with mute) */
+#define SND_CTL_TLVT_DB_MINMAX_MUTE 0x0005
+
+/** Mute state */
+#define SND_CTL_TLV_DB_GAIN_MUTE -9999999
+
+/** TLV type - fixed channel map positions */
+#define SND_CTL_TLVT_CHMAP_FIXED 0x00101
+/** TLV type - freely swappable channel map positions */
+#define SND_CTL_TLVT_CHMAP_VAR 0x00102
+/** TLV type - pair-wise swappable channel map positions */
+#define SND_CTL_TLVT_CHMAP_PAIRED 0x00103
+
/** CTL type */
typedef enum _snd_ctl_type {
/** Kernel level CTL */
/** Shared memory client CTL */
SND_CTL_TYPE_SHM,
/** INET client CTL (not yet implemented) */
- SND_CTL_TYPE_INET
+ SND_CTL_TYPE_INET,
+ /** External control plugin */
+ SND_CTL_TYPE_EXT
} snd_ctl_type_t;
-/** Non blocking mode \hideinitializer */
+/** Non blocking mode (flag for open mode) \hideinitializer */
#define SND_CTL_NONBLOCK 0x0001
-/** Async notification \hideinitializer */
+/** Async notification (flag for open mode) \hideinitializer */
#define SND_CTL_ASYNC 0x0002
+/** Read only (flag for open mode) \hideinitializer */
+#define SND_CTL_READONLY 0x0004
+
/** CTL handle */
typedef struct _snd_ctl snd_ctl_t;
int snd_card_get_name(int card, char **name);
int snd_card_get_longname(int card, char **name);
+int snd_device_name_hint(int card, const char *iface, void ***hints);
+int snd_device_name_free_hint(void **hints);
+char *snd_device_name_get_hint(const void *hint, const char *id);
+
int snd_ctl_open(snd_ctl_t **ctl, const char *name, int mode);
+int snd_ctl_open_lconf(snd_ctl_t **ctl, const char *name, int mode, snd_config_t *lconf);
+int snd_ctl_open_fallback(snd_ctl_t **ctl, snd_config_t *root, const char *name, const char *orig_name, int mode);
int snd_ctl_close(snd_ctl_t *ctl);
int snd_ctl_nonblock(snd_ctl_t *ctl, int nonblock);
+static __inline__ int snd_ctl_abort(snd_ctl_t *ctl) { return snd_ctl_nonblock(ctl, 2); }
int snd_async_add_ctl_handler(snd_async_handler_t **handler, snd_ctl_t *ctl,
snd_async_callback_t callback, void *private_data);
snd_ctl_t *snd_async_handler_get_ctl(snd_async_handler_t *handler);
int snd_ctl_poll_descriptors_count(snd_ctl_t *ctl);
int snd_ctl_poll_descriptors(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int space);
+int snd_ctl_poll_descriptors_revents(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
int snd_ctl_subscribe_events(snd_ctl_t *ctl, int subscribe);
int snd_ctl_card_info(snd_ctl_t *ctl, snd_ctl_card_info_t *info);
-int snd_ctl_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t * list);
+int snd_ctl_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t *list);
int snd_ctl_elem_info(snd_ctl_t *ctl, snd_ctl_elem_info_t *info);
int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
int snd_ctl_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
int snd_ctl_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
int snd_ctl_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
+int snd_ctl_elem_tlv_read(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ unsigned int *tlv, unsigned int tlv_size);
+int snd_ctl_elem_tlv_write(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ const unsigned int *tlv);
+int snd_ctl_elem_tlv_command(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ const unsigned int *tlv);
+#ifdef __ALSA_HWDEP_H
int snd_ctl_hwdep_next_device(snd_ctl_t *ctl, int * device);
int snd_ctl_hwdep_info(snd_ctl_t *ctl, snd_hwdep_info_t * info);
+#endif
+#ifdef __ALSA_PCM_H
int snd_ctl_pcm_next_device(snd_ctl_t *ctl, int *device);
int snd_ctl_pcm_info(snd_ctl_t *ctl, snd_pcm_info_t * info);
int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *ctl, int subdev);
+#endif
+#ifdef __ALSA_RAWMIDI_H
int snd_ctl_rawmidi_next_device(snd_ctl_t *ctl, int * device);
int snd_ctl_rawmidi_info(snd_ctl_t *ctl, snd_rawmidi_info_t * info);
int snd_ctl_rawmidi_prefer_subdevice(snd_ctl_t *ctl, int subdev);
+#endif
int snd_ctl_set_power_state(snd_ctl_t *ctl, unsigned int state);
int snd_ctl_get_power_state(snd_ctl_t *ctl, unsigned int *state);
const char *snd_ctl_name(snd_ctl_t *ctl);
snd_ctl_type_t snd_ctl_type(snd_ctl_t *ctl);
-void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size);
const char *snd_ctl_elem_type_name(snd_ctl_elem_type_t type);
const char *snd_ctl_elem_iface_name(snd_ctl_elem_iface_t iface);
const char *snd_ctl_event_type_name(snd_ctl_event_type_t type);
int snd_ctl_elem_list_alloc_space(snd_ctl_elem_list_t *obj, unsigned int entries);
void snd_ctl_elem_list_free_space(snd_ctl_elem_list_t *obj);
+char *snd_ctl_ascii_elem_id_get(snd_ctl_elem_id_t *id);
+int snd_ctl_ascii_elem_id_parse(snd_ctl_elem_id_t *dst, const char *str);
+int snd_ctl_ascii_value_parse(snd_ctl_t *handle,
+ snd_ctl_elem_value_t *dst,
+ snd_ctl_elem_info_t *info,
+ const char *value);
+
size_t snd_ctl_elem_id_sizeof(void);
/** \hideinitializer
* \brief allocate an invalid #snd_ctl_elem_id_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_elem_id_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_elem_id_t *) alloca(snd_ctl_elem_id_sizeof()); memset(*ptr, 0, snd_ctl_elem_id_sizeof()); } while (0)
+#define snd_ctl_elem_id_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_id)
int snd_ctl_elem_id_malloc(snd_ctl_elem_id_t **ptr);
void snd_ctl_elem_id_free(snd_ctl_elem_id_t *obj);
void snd_ctl_elem_id_clear(snd_ctl_elem_id_t *obj);
* \brief allocate an invalid #snd_ctl_card_info_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_card_info_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_card_info_t *) alloca(snd_ctl_card_info_sizeof()); memset(*ptr, 0, snd_ctl_card_info_sizeof()); } while (0)
+#define snd_ctl_card_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_card_info)
int snd_ctl_card_info_malloc(snd_ctl_card_info_t **ptr);
void snd_ctl_card_info_free(snd_ctl_card_info_t *obj);
void snd_ctl_card_info_clear(snd_ctl_card_info_t *obj);
* \brief allocate an invalid #snd_ctl_event_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_event_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_event_t *) alloca(snd_ctl_event_sizeof()); memset(*ptr, 0, snd_ctl_event_sizeof()); } while (0)
+#define snd_ctl_event_alloca(ptr) __snd_alloca(ptr, snd_ctl_event)
int snd_ctl_event_malloc(snd_ctl_event_t **ptr);
void snd_ctl_event_free(snd_ctl_event_t *obj);
void snd_ctl_event_clear(snd_ctl_event_t *obj);
* \brief allocate an invalid #snd_ctl_elem_list_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_elem_list_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_elem_list_t *) alloca(snd_ctl_elem_list_sizeof()); memset(*ptr, 0, snd_ctl_elem_list_sizeof()); } while (0)
+#define snd_ctl_elem_list_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_list)
int snd_ctl_elem_list_malloc(snd_ctl_elem_list_t **ptr);
void snd_ctl_elem_list_free(snd_ctl_elem_list_t *obj);
void snd_ctl_elem_list_clear(snd_ctl_elem_list_t *obj);
* \brief allocate an invalid #snd_ctl_elem_info_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_elem_info_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_elem_info_t *) alloca(snd_ctl_elem_info_sizeof()); memset(*ptr, 0, snd_ctl_elem_info_sizeof()); } while (0)
+#define snd_ctl_elem_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_info)
int snd_ctl_elem_info_malloc(snd_ctl_elem_info_t **ptr);
void snd_ctl_elem_info_free(snd_ctl_elem_info_t *obj);
void snd_ctl_elem_info_clear(snd_ctl_elem_info_t *obj);
int snd_ctl_elem_info_is_volatile(const snd_ctl_elem_info_t *obj);
int snd_ctl_elem_info_is_inactive(const snd_ctl_elem_info_t *obj);
int snd_ctl_elem_info_is_locked(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_is_tlv_readable(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_is_tlv_writable(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_is_tlv_commandable(const snd_ctl_elem_info_t *obj);
int snd_ctl_elem_info_is_owner(const snd_ctl_elem_info_t *obj);
-int snd_ctl_elem_info_is_indirect(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_is_user(const snd_ctl_elem_info_t *obj);
pid_t snd_ctl_elem_info_get_owner(const snd_ctl_elem_info_t *obj);
unsigned int snd_ctl_elem_info_get_count(const snd_ctl_elem_info_t *obj);
long snd_ctl_elem_info_get_min(const snd_ctl_elem_info_t *obj);
long snd_ctl_elem_info_get_max(const snd_ctl_elem_info_t *obj);
long snd_ctl_elem_info_get_step(const snd_ctl_elem_info_t *obj);
+long long snd_ctl_elem_info_get_min64(const snd_ctl_elem_info_t *obj);
+long long snd_ctl_elem_info_get_max64(const snd_ctl_elem_info_t *obj);
+long long snd_ctl_elem_info_get_step64(const snd_ctl_elem_info_t *obj);
unsigned int snd_ctl_elem_info_get_items(const snd_ctl_elem_info_t *obj);
void snd_ctl_elem_info_set_item(snd_ctl_elem_info_t *obj, unsigned int val);
const char *snd_ctl_elem_info_get_item_name(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_get_dimensions(const snd_ctl_elem_info_t *obj);
+int snd_ctl_elem_info_get_dimension(const snd_ctl_elem_info_t *obj, unsigned int idx);
void snd_ctl_elem_info_get_id(const snd_ctl_elem_info_t *obj, snd_ctl_elem_id_t *ptr);
unsigned int snd_ctl_elem_info_get_numid(const snd_ctl_elem_info_t *obj);
snd_ctl_elem_iface_t snd_ctl_elem_info_get_interface(const snd_ctl_elem_info_t *obj);
void snd_ctl_elem_info_set_name(snd_ctl_elem_info_t *obj, const char *val);
void snd_ctl_elem_info_set_index(snd_ctl_elem_info_t *obj, unsigned int val);
+int snd_ctl_elem_add_integer(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int count, long imin, long imax, long istep);
+int snd_ctl_elem_add_integer64(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int count, long long imin, long long imax, long long istep);
+int snd_ctl_elem_add_boolean(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int count);
+int snd_ctl_elem_add_enumerated(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int count, unsigned int items, const char *const names[]);
+int snd_ctl_elem_add_iec958(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id);
+int snd_ctl_elem_remove(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
+
size_t snd_ctl_elem_value_sizeof(void);
/** \hideinitializer
* \brief allocate an invalid #snd_ctl_elem_value_t using standard alloca
* \param ptr returned pointer
*/
-#define snd_ctl_elem_value_alloca(ptr) do { assert(ptr); *ptr = (snd_ctl_elem_value_t *) alloca(snd_ctl_elem_value_sizeof()); memset(*ptr, 0, snd_ctl_elem_value_sizeof()); } while (0)
+#define snd_ctl_elem_value_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_value)
int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr);
void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj);
void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj);
void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src);
+int snd_ctl_elem_value_compare(snd_ctl_elem_value_t *left, const snd_ctl_elem_value_t *right);
void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr);
unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj);
snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t *obj);
void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val);
int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int idx);
long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned int idx);
+long long snd_ctl_elem_value_get_integer64(const snd_ctl_elem_value_t *obj, unsigned int idx);
unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj, unsigned int idx);
unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsigned int idx);
void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
+void snd_ctl_elem_value_set_integer64(snd_ctl_elem_value_t *obj, unsigned int idx, long long val);
void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val);
void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val);
+void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size);
const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj);
void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr);
void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr);
+int snd_tlv_parse_dB_info(unsigned int *tlv, unsigned int tlv_size,
+ unsigned int **db_tlvp);
+int snd_tlv_get_dB_range(unsigned int *tlv, long rangemin, long rangemax,
+ long *min, long *max);
+int snd_tlv_convert_to_dB(unsigned int *tlv, long rangemin, long rangemax,
+ long volume, long *db_gain);
+int snd_tlv_convert_from_dB(unsigned int *tlv, long rangemin, long rangemax,
+ long db_gain, long *value, int xdir);
+int snd_ctl_get_dB_range(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ long *min, long *max);
+int snd_ctl_convert_to_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ long volume, long *db_gain);
+int snd_ctl_convert_from_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
+ long db_gain, long *value, int xdir);
+
/**
- * \defgroup HControl Highlevel Control Interface
+ * \defgroup HControl High level Control Interface
* \ingroup Control
- * The highlevel control interface.
+ * The high level control interface.
+ * See \ref hcontrol page for more details.
* \{
*/
unsigned int mask);
int snd_hctl_open(snd_hctl_t **hctl, const char *name, int mode);
+int snd_hctl_open_ctl(snd_hctl_t **hctlp, snd_ctl_t *ctl);
int snd_hctl_close(snd_hctl_t *hctl);
int snd_hctl_nonblock(snd_hctl_t *hctl, int nonblock);
+static __inline__ int snd_hctl_abort(snd_hctl_t *hctl) { return snd_hctl_nonblock(hctl, 2); }
int snd_hctl_poll_descriptors_count(snd_hctl_t *hctl);
int snd_hctl_poll_descriptors(snd_hctl_t *hctl, struct pollfd *pfds, unsigned int space);
+int snd_hctl_poll_descriptors_revents(snd_hctl_t *ctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
unsigned int snd_hctl_get_count(snd_hctl_t *hctl);
int snd_hctl_set_compare(snd_hctl_t *hctl, snd_hctl_compare_t hsort);
snd_hctl_elem_t *snd_hctl_first_elem(snd_hctl_t *hctl);
int snd_hctl_handle_events(snd_hctl_t *hctl);
const char *snd_hctl_name(snd_hctl_t *hctl);
int snd_hctl_wait(snd_hctl_t *hctl, int timeout);
+snd_ctl_t *snd_hctl_ctl(snd_hctl_t *hctl);
snd_hctl_elem_t *snd_hctl_elem_next(snd_hctl_elem_t *elem);
snd_hctl_elem_t *snd_hctl_elem_prev(snd_hctl_elem_t *elem);
int snd_hctl_elem_info(snd_hctl_elem_t *elem, snd_ctl_elem_info_t * info);
int snd_hctl_elem_read(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
int snd_hctl_elem_write(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
+int snd_hctl_elem_tlv_read(snd_hctl_elem_t *elem, unsigned int *tlv, unsigned int tlv_size);
+int snd_hctl_elem_tlv_write(snd_hctl_elem_t *elem, const unsigned int *tlv);
+int snd_hctl_elem_tlv_command(snd_hctl_elem_t *elem, const unsigned int *tlv);
snd_hctl_t *snd_hctl_elem_get_hctl(snd_hctl_elem_t *elem);
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