2 * \file include/control.h
3 * \brief Application interface library for the ALSA driver
4 * \author Jaroslav Kysela <perex@perex.cz>
5 * \author Abramo Bagnara <abramo@alsa-project.org>
6 * \author Takashi Iwai <tiwai@suse.de>
9 * Application interface library for the ALSA driver
12 * This library is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License as
14 * published by the Free Software Foundation; either version 2.1 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #ifndef __ALSA_CONTROL_H
29 #define __ALSA_CONTROL_H
36 * \defgroup Control Control Interface
37 * The control interface.
38 * See \ref control page for more details.
42 /** dlsym version for interface entry callback */
43 #define SND_CONTROL_DLSYM_VERSION _dlsym_control_001
45 /** IEC958 structure */
46 typedef struct snd_aes_iec958 {
47 unsigned char status[24]; /**< AES/IEC958 channel status bits */
48 unsigned char subcode[147]; /**< AES/IEC958 subcode bits */
49 unsigned char pad; /**< nothing */
50 unsigned char dig_subframe[4]; /**< AES/IEC958 subframe bits */
53 /** CTL card info container */
54 typedef struct _snd_ctl_card_info snd_ctl_card_info_t;
56 /** CTL element identifier container */
57 typedef struct _snd_ctl_elem_id snd_ctl_elem_id_t;
59 /** CTL element identifier list container */
60 typedef struct _snd_ctl_elem_list snd_ctl_elem_list_t;
62 /** CTL element info container */
63 typedef struct _snd_ctl_elem_info snd_ctl_elem_info_t;
65 /** CTL element value container */
66 typedef struct _snd_ctl_elem_value snd_ctl_elem_value_t;
68 /** CTL event container */
69 typedef struct _snd_ctl_event snd_ctl_event_t;
71 /** CTL element type */
72 typedef enum _snd_ctl_elem_type {
74 SND_CTL_ELEM_TYPE_NONE = 0,
75 /** Boolean contents */
76 SND_CTL_ELEM_TYPE_BOOLEAN,
77 /** Integer contents */
78 SND_CTL_ELEM_TYPE_INTEGER,
79 /** Enumerated contents */
80 SND_CTL_ELEM_TYPE_ENUMERATED,
82 SND_CTL_ELEM_TYPE_BYTES,
83 /** IEC958 (S/PDIF) setting content */
84 SND_CTL_ELEM_TYPE_IEC958,
85 /** 64-bit integer contents */
86 SND_CTL_ELEM_TYPE_INTEGER64,
87 SND_CTL_ELEM_TYPE_LAST = SND_CTL_ELEM_TYPE_INTEGER64
88 } snd_ctl_elem_type_t;
90 /** CTL related interface */
91 typedef enum _snd_ctl_elem_iface {
93 SND_CTL_ELEM_IFACE_CARD = 0,
94 /** Hardware dependent device */
95 SND_CTL_ELEM_IFACE_HWDEP,
97 SND_CTL_ELEM_IFACE_MIXER,
99 SND_CTL_ELEM_IFACE_PCM,
101 SND_CTL_ELEM_IFACE_RAWMIDI,
103 SND_CTL_ELEM_IFACE_TIMER,
105 SND_CTL_ELEM_IFACE_SEQUENCER,
106 SND_CTL_ELEM_IFACE_LAST = SND_CTL_ELEM_IFACE_SEQUENCER
107 } snd_ctl_elem_iface_t;
110 typedef enum _snd_ctl_event_type {
111 /** Elements related event */
112 SND_CTL_EVENT_ELEM = 0,
113 SND_CTL_EVENT_LAST = SND_CTL_EVENT_ELEM
114 }snd_ctl_event_type_t;
116 /** Element has been removed (Warning: test this first and if set don't
117 * test the other masks) \hideinitializer */
118 #define SND_CTL_EVENT_MASK_REMOVE (~0U)
119 /** Element value has been changed \hideinitializer */
120 #define SND_CTL_EVENT_MASK_VALUE (1<<0)
121 /** Element info has been changed \hideinitializer */
122 #define SND_CTL_EVENT_MASK_INFO (1<<1)
123 /** Element has been added \hideinitializer */
124 #define SND_CTL_EVENT_MASK_ADD (1<<2)
125 /** Element's TLV value has been changed \hideinitializer */
126 #define SND_CTL_EVENT_MASK_TLV (1<<3)
128 /** CTL name helper */
129 #define SND_CTL_NAME_NONE ""
130 /** CTL name helper */
131 #define SND_CTL_NAME_PLAYBACK "Playback "
132 /** CTL name helper */
133 #define SND_CTL_NAME_CAPTURE "Capture "
135 /** CTL name helper */
136 #define SND_CTL_NAME_IEC958_NONE ""
137 /** CTL name helper */
138 #define SND_CTL_NAME_IEC958_SWITCH "Switch"
139 /** CTL name helper */
140 #define SND_CTL_NAME_IEC958_VOLUME "Volume"
141 /** CTL name helper */
142 #define SND_CTL_NAME_IEC958_DEFAULT "Default"
143 /** CTL name helper */
144 #define SND_CTL_NAME_IEC958_MASK "Mask"
145 /** CTL name helper */
146 #define SND_CTL_NAME_IEC958_CON_MASK "Con Mask"
147 /** CTL name helper */
148 #define SND_CTL_NAME_IEC958_PRO_MASK "Pro Mask"
149 /** CTL name helper */
150 #define SND_CTL_NAME_IEC958_PCM_STREAM "PCM Stream"
151 /** Element name for IEC958 (S/PDIF) */
152 #define SND_CTL_NAME_IEC958(expl,direction,what) "IEC958 " expl SND_CTL_NAME_##direction SND_CTL_NAME_IEC958_##what
154 /** Mask for the major Power State identifier */
155 #define SND_CTL_POWER_MASK 0xff00
156 /** ACPI/PCI Power State D0 */
157 #define SND_CTL_POWER_D0 0x0000
158 /** ACPI/PCI Power State D1 */
159 #define SND_CTL_POWER_D1 0x0100
160 /** ACPI/PCI Power State D2 */
161 #define SND_CTL_POWER_D2 0x0200
162 /** ACPI/PCI Power State D3 */
163 #define SND_CTL_POWER_D3 0x0300
164 /** ACPI/PCI Power State D3hot */
165 #define SND_CTL_POWER_D3hot (SND_CTL_POWER_D3|0x0000)
166 /** ACPI/PCI Power State D3cold */
167 #define SND_CTL_POWER_D3cold (SND_CTL_POWER_D3|0x0001)
169 /** TLV type - Container */
170 #define SND_CTL_TLVT_CONTAINER 0x0000
171 /** TLV type - basic dB scale */
172 #define SND_CTL_TLVT_DB_SCALE 0x0001
173 /** TLV type - linear volume */
174 #define SND_CTL_TLVT_DB_LINEAR 0x0002
175 /** TLV type - dB range container */
176 #define SND_CTL_TLVT_DB_RANGE 0x0003
179 #define SND_CTL_TLV_DB_GAIN_MUTE -9999999
182 typedef enum _snd_ctl_type {
183 /** Kernel level CTL */
185 /** Shared memory client CTL */
187 /** INET client CTL (not yet implemented) */
189 /** External control plugin */
193 /** Non blocking mode (flag for open mode) \hideinitializer */
194 #define SND_CTL_NONBLOCK 0x0001
196 /** Async notification (flag for open mode) \hideinitializer */
197 #define SND_CTL_ASYNC 0x0002
199 /** Read only (flag for open mode) \hideinitializer */
200 #define SND_CTL_READONLY 0x0004
203 typedef struct _snd_ctl snd_ctl_t;
205 /** Don't destroy the ctl handle when close */
206 #define SND_SCTL_NOFREE 0x0001
209 typedef struct _snd_sctl snd_sctl_t;
211 int snd_card_load(int card);
212 int snd_card_next(int *card);
213 int snd_card_get_index(const char *name);
214 int snd_card_get_name(int card, char **name);
215 int snd_card_get_longname(int card, char **name);
217 int snd_device_name_hint(int card, const char *iface, void ***hints);
218 int snd_device_name_free_hint(void **hints);
219 char *snd_device_name_get_hint(const void *hint, const char *id);
221 int snd_ctl_open(snd_ctl_t **ctl, const char *name, int mode);
222 int snd_ctl_open_lconf(snd_ctl_t **ctl, const char *name, int mode, snd_config_t *lconf);
223 int snd_ctl_close(snd_ctl_t *ctl);
224 int snd_ctl_nonblock(snd_ctl_t *ctl, int nonblock);
225 int snd_async_add_ctl_handler(snd_async_handler_t **handler, snd_ctl_t *ctl,
226 snd_async_callback_t callback, void *private_data);
227 snd_ctl_t *snd_async_handler_get_ctl(snd_async_handler_t *handler);
228 int snd_ctl_poll_descriptors_count(snd_ctl_t *ctl);
229 int snd_ctl_poll_descriptors(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int space);
230 int snd_ctl_poll_descriptors_revents(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
231 int snd_ctl_subscribe_events(snd_ctl_t *ctl, int subscribe);
232 int snd_ctl_card_info(snd_ctl_t *ctl, snd_ctl_card_info_t *info);
233 int snd_ctl_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t *list);
234 int snd_ctl_elem_info(snd_ctl_t *ctl, snd_ctl_elem_info_t *info);
235 int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
236 int snd_ctl_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
237 int snd_ctl_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
238 int snd_ctl_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
239 int snd_ctl_elem_tlv_read(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
240 unsigned int *tlv, unsigned int tlv_size);
241 int snd_ctl_elem_tlv_write(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
242 const unsigned int *tlv);
243 int snd_ctl_elem_tlv_command(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
244 const unsigned int *tlv);
245 #ifdef __ALSA_HWDEP_H
246 int snd_ctl_hwdep_next_device(snd_ctl_t *ctl, int * device);
247 int snd_ctl_hwdep_info(snd_ctl_t *ctl, snd_hwdep_info_t * info);
250 int snd_ctl_pcm_next_device(snd_ctl_t *ctl, int *device);
251 int snd_ctl_pcm_info(snd_ctl_t *ctl, snd_pcm_info_t * info);
252 int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *ctl, int subdev);
254 #ifdef __ALSA_RAWMIDI_H
255 int snd_ctl_rawmidi_next_device(snd_ctl_t *ctl, int * device);
256 int snd_ctl_rawmidi_info(snd_ctl_t *ctl, snd_rawmidi_info_t * info);
257 int snd_ctl_rawmidi_prefer_subdevice(snd_ctl_t *ctl, int subdev);
259 int snd_ctl_set_power_state(snd_ctl_t *ctl, unsigned int state);
260 int snd_ctl_get_power_state(snd_ctl_t *ctl, unsigned int *state);
262 int snd_ctl_read(snd_ctl_t *ctl, snd_ctl_event_t *event);
263 int snd_ctl_wait(snd_ctl_t *ctl, int timeout);
264 const char *snd_ctl_name(snd_ctl_t *ctl);
265 snd_ctl_type_t snd_ctl_type(snd_ctl_t *ctl);
267 const char *snd_ctl_elem_type_name(snd_ctl_elem_type_t type);
268 const char *snd_ctl_elem_iface_name(snd_ctl_elem_iface_t iface);
269 const char *snd_ctl_event_type_name(snd_ctl_event_type_t type);
271 unsigned int snd_ctl_event_elem_get_mask(const snd_ctl_event_t *obj);
272 unsigned int snd_ctl_event_elem_get_numid(const snd_ctl_event_t *obj);
273 void snd_ctl_event_elem_get_id(const snd_ctl_event_t *obj, snd_ctl_elem_id_t *ptr);
274 snd_ctl_elem_iface_t snd_ctl_event_elem_get_interface(const snd_ctl_event_t *obj);
275 unsigned int snd_ctl_event_elem_get_device(const snd_ctl_event_t *obj);
276 unsigned int snd_ctl_event_elem_get_subdevice(const snd_ctl_event_t *obj);
277 const char *snd_ctl_event_elem_get_name(const snd_ctl_event_t *obj);
278 unsigned int snd_ctl_event_elem_get_index(const snd_ctl_event_t *obj);
280 int snd_ctl_elem_list_alloc_space(snd_ctl_elem_list_t *obj, unsigned int entries);
281 void snd_ctl_elem_list_free_space(snd_ctl_elem_list_t *obj);
283 size_t snd_ctl_elem_id_sizeof(void);
285 * \brief allocate an invalid #snd_ctl_elem_id_t using standard alloca
286 * \param ptr returned pointer
288 #define snd_ctl_elem_id_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_id)
289 int snd_ctl_elem_id_malloc(snd_ctl_elem_id_t **ptr);
290 void snd_ctl_elem_id_free(snd_ctl_elem_id_t *obj);
291 void snd_ctl_elem_id_clear(snd_ctl_elem_id_t *obj);
292 void snd_ctl_elem_id_copy(snd_ctl_elem_id_t *dst, const snd_ctl_elem_id_t *src);
293 unsigned int snd_ctl_elem_id_get_numid(const snd_ctl_elem_id_t *obj);
294 snd_ctl_elem_iface_t snd_ctl_elem_id_get_interface(const snd_ctl_elem_id_t *obj);
295 unsigned int snd_ctl_elem_id_get_device(const snd_ctl_elem_id_t *obj);
296 unsigned int snd_ctl_elem_id_get_subdevice(const snd_ctl_elem_id_t *obj);
297 const char *snd_ctl_elem_id_get_name(const snd_ctl_elem_id_t *obj);
298 unsigned int snd_ctl_elem_id_get_index(const snd_ctl_elem_id_t *obj);
299 void snd_ctl_elem_id_set_numid(snd_ctl_elem_id_t *obj, unsigned int val);
300 void snd_ctl_elem_id_set_interface(snd_ctl_elem_id_t *obj, snd_ctl_elem_iface_t val);
301 void snd_ctl_elem_id_set_device(snd_ctl_elem_id_t *obj, unsigned int val);
302 void snd_ctl_elem_id_set_subdevice(snd_ctl_elem_id_t *obj, unsigned int val);
303 void snd_ctl_elem_id_set_name(snd_ctl_elem_id_t *obj, const char *val);
304 void snd_ctl_elem_id_set_index(snd_ctl_elem_id_t *obj, unsigned int val);
306 size_t snd_ctl_card_info_sizeof(void);
308 * \brief allocate an invalid #snd_ctl_card_info_t using standard alloca
309 * \param ptr returned pointer
311 #define snd_ctl_card_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_card_info)
312 int snd_ctl_card_info_malloc(snd_ctl_card_info_t **ptr);
313 void snd_ctl_card_info_free(snd_ctl_card_info_t *obj);
314 void snd_ctl_card_info_clear(snd_ctl_card_info_t *obj);
315 void snd_ctl_card_info_copy(snd_ctl_card_info_t *dst, const snd_ctl_card_info_t *src);
316 int snd_ctl_card_info_get_card(const snd_ctl_card_info_t *obj);
317 const char *snd_ctl_card_info_get_id(const snd_ctl_card_info_t *obj);
318 const char *snd_ctl_card_info_get_driver(const snd_ctl_card_info_t *obj);
319 const char *snd_ctl_card_info_get_name(const snd_ctl_card_info_t *obj);
320 const char *snd_ctl_card_info_get_longname(const snd_ctl_card_info_t *obj);
321 const char *snd_ctl_card_info_get_mixername(const snd_ctl_card_info_t *obj);
322 const char *snd_ctl_card_info_get_components(const snd_ctl_card_info_t *obj);
324 size_t snd_ctl_event_sizeof(void);
326 * \brief allocate an invalid #snd_ctl_event_t using standard alloca
327 * \param ptr returned pointer
329 #define snd_ctl_event_alloca(ptr) __snd_alloca(ptr, snd_ctl_event)
330 int snd_ctl_event_malloc(snd_ctl_event_t **ptr);
331 void snd_ctl_event_free(snd_ctl_event_t *obj);
332 void snd_ctl_event_clear(snd_ctl_event_t *obj);
333 void snd_ctl_event_copy(snd_ctl_event_t *dst, const snd_ctl_event_t *src);
334 snd_ctl_event_type_t snd_ctl_event_get_type(const snd_ctl_event_t *obj);
336 size_t snd_ctl_elem_list_sizeof(void);
338 * \brief allocate an invalid #snd_ctl_elem_list_t using standard alloca
339 * \param ptr returned pointer
341 #define snd_ctl_elem_list_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_list)
342 int snd_ctl_elem_list_malloc(snd_ctl_elem_list_t **ptr);
343 void snd_ctl_elem_list_free(snd_ctl_elem_list_t *obj);
344 void snd_ctl_elem_list_clear(snd_ctl_elem_list_t *obj);
345 void snd_ctl_elem_list_copy(snd_ctl_elem_list_t *dst, const snd_ctl_elem_list_t *src);
346 void snd_ctl_elem_list_set_offset(snd_ctl_elem_list_t *obj, unsigned int val);
347 unsigned int snd_ctl_elem_list_get_used(const snd_ctl_elem_list_t *obj);
348 unsigned int snd_ctl_elem_list_get_count(const snd_ctl_elem_list_t *obj);
349 void snd_ctl_elem_list_get_id(const snd_ctl_elem_list_t *obj, unsigned int idx, snd_ctl_elem_id_t *ptr);
350 unsigned int snd_ctl_elem_list_get_numid(const snd_ctl_elem_list_t *obj, unsigned int idx);
351 snd_ctl_elem_iface_t snd_ctl_elem_list_get_interface(const snd_ctl_elem_list_t *obj, unsigned int idx);
352 unsigned int snd_ctl_elem_list_get_device(const snd_ctl_elem_list_t *obj, unsigned int idx);
353 unsigned int snd_ctl_elem_list_get_subdevice(const snd_ctl_elem_list_t *obj, unsigned int idx);
354 const char *snd_ctl_elem_list_get_name(const snd_ctl_elem_list_t *obj, unsigned int idx);
355 unsigned int snd_ctl_elem_list_get_index(const snd_ctl_elem_list_t *obj, unsigned int idx);
357 size_t snd_ctl_elem_info_sizeof(void);
359 * \brief allocate an invalid #snd_ctl_elem_info_t using standard alloca
360 * \param ptr returned pointer
362 #define snd_ctl_elem_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_info)
363 int snd_ctl_elem_info_malloc(snd_ctl_elem_info_t **ptr);
364 void snd_ctl_elem_info_free(snd_ctl_elem_info_t *obj);
365 void snd_ctl_elem_info_clear(snd_ctl_elem_info_t *obj);
366 void snd_ctl_elem_info_copy(snd_ctl_elem_info_t *dst, const snd_ctl_elem_info_t *src);
367 snd_ctl_elem_type_t snd_ctl_elem_info_get_type(const snd_ctl_elem_info_t *obj);
368 int snd_ctl_elem_info_is_readable(const snd_ctl_elem_info_t *obj);
369 int snd_ctl_elem_info_is_writable(const snd_ctl_elem_info_t *obj);
370 int snd_ctl_elem_info_is_volatile(const snd_ctl_elem_info_t *obj);
371 int snd_ctl_elem_info_is_inactive(const snd_ctl_elem_info_t *obj);
372 int snd_ctl_elem_info_is_locked(const snd_ctl_elem_info_t *obj);
373 int snd_ctl_elem_info_is_tlv_readable(const snd_ctl_elem_info_t *obj);
374 int snd_ctl_elem_info_is_tlv_writable(const snd_ctl_elem_info_t *obj);
375 int snd_ctl_elem_info_is_tlv_commandable(const snd_ctl_elem_info_t *obj);
376 int snd_ctl_elem_info_is_owner(const snd_ctl_elem_info_t *obj);
377 int snd_ctl_elem_info_is_user(const snd_ctl_elem_info_t *obj);
378 pid_t snd_ctl_elem_info_get_owner(const snd_ctl_elem_info_t *obj);
379 unsigned int snd_ctl_elem_info_get_count(const snd_ctl_elem_info_t *obj);
380 long snd_ctl_elem_info_get_min(const snd_ctl_elem_info_t *obj);
381 long snd_ctl_elem_info_get_max(const snd_ctl_elem_info_t *obj);
382 long snd_ctl_elem_info_get_step(const snd_ctl_elem_info_t *obj);
383 long long snd_ctl_elem_info_get_min64(const snd_ctl_elem_info_t *obj);
384 long long snd_ctl_elem_info_get_max64(const snd_ctl_elem_info_t *obj);
385 long long snd_ctl_elem_info_get_step64(const snd_ctl_elem_info_t *obj);
386 unsigned int snd_ctl_elem_info_get_items(const snd_ctl_elem_info_t *obj);
387 void snd_ctl_elem_info_set_item(snd_ctl_elem_info_t *obj, unsigned int val);
388 const char *snd_ctl_elem_info_get_item_name(const snd_ctl_elem_info_t *obj);
389 int snd_ctl_elem_info_get_dimensions(const snd_ctl_elem_info_t *obj);
390 int snd_ctl_elem_info_get_dimension(const snd_ctl_elem_info_t *obj, unsigned int idx);
391 void snd_ctl_elem_info_get_id(const snd_ctl_elem_info_t *obj, snd_ctl_elem_id_t *ptr);
392 unsigned int snd_ctl_elem_info_get_numid(const snd_ctl_elem_info_t *obj);
393 snd_ctl_elem_iface_t snd_ctl_elem_info_get_interface(const snd_ctl_elem_info_t *obj);
394 unsigned int snd_ctl_elem_info_get_device(const snd_ctl_elem_info_t *obj);
395 unsigned int snd_ctl_elem_info_get_subdevice(const snd_ctl_elem_info_t *obj);
396 const char *snd_ctl_elem_info_get_name(const snd_ctl_elem_info_t *obj);
397 unsigned int snd_ctl_elem_info_get_index(const snd_ctl_elem_info_t *obj);
398 void snd_ctl_elem_info_set_id(snd_ctl_elem_info_t *obj, const snd_ctl_elem_id_t *ptr);
399 void snd_ctl_elem_info_set_numid(snd_ctl_elem_info_t *obj, unsigned int val);
400 void snd_ctl_elem_info_set_interface(snd_ctl_elem_info_t *obj, snd_ctl_elem_iface_t val);
401 void snd_ctl_elem_info_set_device(snd_ctl_elem_info_t *obj, unsigned int val);
402 void snd_ctl_elem_info_set_subdevice(snd_ctl_elem_info_t *obj, unsigned int val);
403 void snd_ctl_elem_info_set_name(snd_ctl_elem_info_t *obj, const char *val);
404 void snd_ctl_elem_info_set_index(snd_ctl_elem_info_t *obj, unsigned int val);
406 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);
407 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);
408 int snd_ctl_elem_add_boolean(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id, unsigned int count);
409 int snd_ctl_elem_add_iec958(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id);
410 int snd_ctl_elem_remove(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
412 size_t snd_ctl_elem_value_sizeof(void);
414 * \brief allocate an invalid #snd_ctl_elem_value_t using standard alloca
415 * \param ptr returned pointer
417 #define snd_ctl_elem_value_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_value)
418 int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr);
419 void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj);
420 void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj);
421 void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src);
422 void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr);
423 unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj);
424 snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t *obj);
425 unsigned int snd_ctl_elem_value_get_device(const snd_ctl_elem_value_t *obj);
426 unsigned int snd_ctl_elem_value_get_subdevice(const snd_ctl_elem_value_t *obj);
427 const char *snd_ctl_elem_value_get_name(const snd_ctl_elem_value_t *obj);
428 unsigned int snd_ctl_elem_value_get_index(const snd_ctl_elem_value_t *obj);
429 void snd_ctl_elem_value_set_id(snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_t *ptr);
430 void snd_ctl_elem_value_set_numid(snd_ctl_elem_value_t *obj, unsigned int val);
431 void snd_ctl_elem_value_set_interface(snd_ctl_elem_value_t *obj, snd_ctl_elem_iface_t val);
432 void snd_ctl_elem_value_set_device(snd_ctl_elem_value_t *obj, unsigned int val);
433 void snd_ctl_elem_value_set_subdevice(snd_ctl_elem_value_t *obj, unsigned int val);
434 void snd_ctl_elem_value_set_name(snd_ctl_elem_value_t *obj, const char *val);
435 void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val);
436 int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int idx);
437 long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned int idx);
438 long long snd_ctl_elem_value_get_integer64(const snd_ctl_elem_value_t *obj, unsigned int idx);
439 unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj, unsigned int idx);
440 unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsigned int idx);
441 void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
442 void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
443 void snd_ctl_elem_value_set_integer64(snd_ctl_elem_value_t *obj, unsigned int idx, long long val);
444 void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val);
445 void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val);
446 void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size);
447 const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj);
448 void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr);
449 void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr);
451 int snd_tlv_parse_dB_info(unsigned int *tlv, unsigned int tlv_size,
452 unsigned int **db_tlvp);
453 int snd_tlv_get_dB_range(unsigned int *tlv, long rangemin, long rangemax,
454 long *min, long *max);
455 int snd_tlv_convert_to_dB(unsigned int *tlv, long rangemin, long rangemax,
456 long volume, long *db_gain);
457 int snd_tlv_convert_from_dB(unsigned int *tlv, long rangemin, long rangemax,
458 long db_gain, long *value, int xdir);
459 int snd_ctl_get_dB_range(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
460 long *min, long *max);
461 int snd_ctl_convert_to_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
462 long volume, long *db_gain);
463 int snd_ctl_convert_from_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
464 long db_gain, long *value, int xdir);
467 * \defgroup HControl High level Control Interface
469 * The high level control interface.
470 * See \ref hcontrol page for more details.
474 /** HCTL element handle */
475 typedef struct _snd_hctl_elem snd_hctl_elem_t;
478 typedef struct _snd_hctl snd_hctl_t;
481 * \brief Compare function for sorting HCTL elements
482 * \param e1 First element
483 * \param e2 Second element
484 * \return -1 if e1 < e2, 0 if e1 == e2, 1 if e1 > e2
486 typedef int (*snd_hctl_compare_t)(const snd_hctl_elem_t *e1,
487 const snd_hctl_elem_t *e2);
488 int snd_hctl_compare_fast(const snd_hctl_elem_t *c1,
489 const snd_hctl_elem_t *c2);
491 * \brief HCTL callback function
492 * \param hctl HCTL handle
493 * \param mask event mask
494 * \param elem related HCTL element (if any)
495 * \return 0 on success otherwise a negative error code
497 typedef int (*snd_hctl_callback_t)(snd_hctl_t *hctl,
499 snd_hctl_elem_t *elem);
501 * \brief HCTL element callback function
502 * \param elem HCTL element
503 * \param mask event mask
504 * \return 0 on success otherwise a negative error code
506 typedef int (*snd_hctl_elem_callback_t)(snd_hctl_elem_t *elem,
509 int snd_hctl_open(snd_hctl_t **hctl, const char *name, int mode);
510 int snd_hctl_open_ctl(snd_hctl_t **hctlp, snd_ctl_t *ctl);
511 int snd_hctl_close(snd_hctl_t *hctl);
512 int snd_hctl_nonblock(snd_hctl_t *hctl, int nonblock);
513 int snd_hctl_poll_descriptors_count(snd_hctl_t *hctl);
514 int snd_hctl_poll_descriptors(snd_hctl_t *hctl, struct pollfd *pfds, unsigned int space);
515 int snd_hctl_poll_descriptors_revents(snd_hctl_t *ctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
516 unsigned int snd_hctl_get_count(snd_hctl_t *hctl);
517 int snd_hctl_set_compare(snd_hctl_t *hctl, snd_hctl_compare_t hsort);
518 snd_hctl_elem_t *snd_hctl_first_elem(snd_hctl_t *hctl);
519 snd_hctl_elem_t *snd_hctl_last_elem(snd_hctl_t *hctl);
520 snd_hctl_elem_t *snd_hctl_find_elem(snd_hctl_t *hctl, const snd_ctl_elem_id_t *id);
521 void snd_hctl_set_callback(snd_hctl_t *hctl, snd_hctl_callback_t callback);
522 void snd_hctl_set_callback_private(snd_hctl_t *hctl, void *data);
523 void *snd_hctl_get_callback_private(snd_hctl_t *hctl);
524 int snd_hctl_load(snd_hctl_t *hctl);
525 int snd_hctl_free(snd_hctl_t *hctl);
526 int snd_hctl_handle_events(snd_hctl_t *hctl);
527 const char *snd_hctl_name(snd_hctl_t *hctl);
528 int snd_hctl_wait(snd_hctl_t *hctl, int timeout);
529 snd_ctl_t *snd_hctl_ctl(snd_hctl_t *hctl);
531 snd_hctl_elem_t *snd_hctl_elem_next(snd_hctl_elem_t *elem);
532 snd_hctl_elem_t *snd_hctl_elem_prev(snd_hctl_elem_t *elem);
533 int snd_hctl_elem_info(snd_hctl_elem_t *elem, snd_ctl_elem_info_t * info);
534 int snd_hctl_elem_read(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
535 int snd_hctl_elem_write(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
536 int snd_hctl_elem_tlv_read(snd_hctl_elem_t *elem, unsigned int *tlv, unsigned int tlv_size);
537 int snd_hctl_elem_tlv_write(snd_hctl_elem_t *elem, const unsigned int *tlv);
538 int snd_hctl_elem_tlv_command(snd_hctl_elem_t *elem, const unsigned int *tlv);
540 snd_hctl_t *snd_hctl_elem_get_hctl(snd_hctl_elem_t *elem);
542 void snd_hctl_elem_get_id(const snd_hctl_elem_t *obj, snd_ctl_elem_id_t *ptr);
543 unsigned int snd_hctl_elem_get_numid(const snd_hctl_elem_t *obj);
544 snd_ctl_elem_iface_t snd_hctl_elem_get_interface(const snd_hctl_elem_t *obj);
545 unsigned int snd_hctl_elem_get_device(const snd_hctl_elem_t *obj);
546 unsigned int snd_hctl_elem_get_subdevice(const snd_hctl_elem_t *obj);
547 const char *snd_hctl_elem_get_name(const snd_hctl_elem_t *obj);
548 unsigned int snd_hctl_elem_get_index(const snd_hctl_elem_t *obj);
549 void snd_hctl_elem_set_callback(snd_hctl_elem_t *obj, snd_hctl_elem_callback_t val);
550 void * snd_hctl_elem_get_callback_private(const snd_hctl_elem_t *obj);
551 void snd_hctl_elem_set_callback_private(snd_hctl_elem_t *obj, void * val);
558 * \defgroup SControl Setup Control Interface
560 * The setup control interface - set or modify control elements from a configuration file.
564 int snd_sctl_build(snd_sctl_t **ctl, snd_ctl_t *handle, snd_config_t *config,
565 snd_config_t *private_data, int mode);
566 int snd_sctl_free(snd_sctl_t *handle);
567 int snd_sctl_install(snd_sctl_t *handle);
568 int snd_sctl_remove(snd_sctl_t *handle);
576 #endif /* __ALSA_CONTROL_H */