2 * \file <alsa/control.h>
3 * \brief Application interface library for the ALSA driver
4 * \author Jaroslav Kysela <perex@suse.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 Library General Public License as
14 * published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #ifndef __ALSA_CONTROL_H
29 #define __ALSA_CONTROL_H
32 * \defgroup Control Control Interface
33 * The control interface.
37 /** dlsym version for interface entry callback */
38 #define SND_CONTROL_DLSYM_VERSION _dlsym_control_001
40 /** IEC958 structure */
41 typedef struct snd_aes_iec958 {
42 unsigned char status[24]; /**< AES/IEC958 channel status bits */
43 unsigned char subcode[147]; /**< AES/IEC958 subcode bits */
44 unsigned char pad; /**< nothing */
45 unsigned char dig_subframe[4]; /**< AES/IEC958 subframe bits */
48 /** CTL card info container */
49 typedef struct _snd_ctl_card_info snd_ctl_card_info_t;
51 /** CTL element identificator container */
52 typedef struct _snd_ctl_elem_id snd_ctl_elem_id_t;
54 /** CTL element identificator list container */
55 typedef struct _snd_ctl_elem_list snd_ctl_elem_list_t;
57 /** CTL element info container */
58 typedef struct _snd_ctl_elem_info snd_ctl_elem_info_t;
60 /** CTL element value container */
61 typedef struct _snd_ctl_elem_value snd_ctl_elem_value_t;
63 /** CTL event container */
64 typedef struct _snd_ctl_event snd_ctl_event_t;
66 /** CTL element type */
67 typedef enum _snd_ctl_elem_type {
69 SND_CTL_ELEM_TYPE_NONE = 0,
70 /** Boolean contents */
71 SND_CTL_ELEM_TYPE_BOOLEAN,
72 /** Integer contents */
73 SND_CTL_ELEM_TYPE_INTEGER,
74 /** Enumerated contents */
75 SND_CTL_ELEM_TYPE_ENUMERATED,
77 SND_CTL_ELEM_TYPE_BYTES,
78 /** IEC958 (S/PDIF) setting content */
79 SND_CTL_ELEM_TYPE_IEC958,
80 SND_CTL_ELEM_TYPE_LAST = SND_CTL_ELEM_TYPE_IEC958,
81 } snd_ctl_elem_type_t;
83 /** CTL related interface */
84 typedef enum _snd_ctl_elem_iface {
86 SND_CTL_ELEM_IFACE_CARD = 0,
87 /** Hardware dependent device */
88 SND_CTL_ELEM_IFACE_HWDEP,
90 SND_CTL_ELEM_IFACE_MIXER,
92 SND_CTL_ELEM_IFACE_PCM,
94 SND_CTL_ELEM_IFACE_RAWMIDI,
96 SND_CTL_ELEM_IFACE_TIMER,
98 SND_CTL_ELEM_IFACE_SEQUENCER,
99 SND_CTL_ELEM_IFACE_LAST = SND_CTL_ELEM_IFACE_SEQUENCER,
100 } snd_ctl_elem_iface_t;
103 typedef enum _snd_ctl_event_type {
104 /** Elements related event */
105 SND_CTL_EVENT_ELEM = 0,
106 SND_CTL_EVENT_LAST = SND_CTL_EVENT_ELEM,
107 }snd_ctl_event_type_t;
109 /** Element has been removed (Warning: test this first and if set don't
110 * test the other masks) \hideinitializer */
111 #define SND_CTL_EVENT_MASK_REMOVE (~0U)
112 /** Element value has been changed \hideinitializer */
113 #define SND_CTL_EVENT_MASK_VALUE (1<<0)
114 /** Element info has been changed \hideinitializer */
115 #define SND_CTL_EVENT_MASK_INFO (1<<1)
116 /** Element has been added \hideinitializer */
117 #define SND_CTL_EVENT_MASK_ADD (1<<2)
119 /** CTL name helper */
120 #define SND_CTL_NAME_NONE ""
121 /** CTL name helper */
122 #define SND_CTL_NAME_PLAYBACK "Playback "
123 /** CTL name helper */
124 #define SND_CTL_NAME_CAPTURE "Capture "
126 /** CTL name helper */
127 #define SND_CTL_NAME_IEC958_NONE ""
128 /** CTL name helper */
129 #define SND_CTL_NAME_IEC958_SWITCH "Switch"
130 /** CTL name helper */
131 #define SND_CTL_NAME_IEC958_VOLUME "Volume"
132 /** CTL name helper */
133 #define SND_CTL_NAME_IEC958_DEFAULT "Default"
134 /** CTL name helper */
135 #define SND_CTL_NAME_IEC958_MASK "Mask"
136 /** CTL name helper */
137 #define SND_CTL_NAME_IEC958_CON_MASK "Con Mask"
138 /** CTL name helper */
139 #define SND_CTL_NAME_IEC958_PRO_MASK "Pro Mask"
140 /** CTL name helper */
141 #define SND_CTL_NAME_IEC958_PCM_STREAM "PCM Stream"
142 /** Element name for IEC958 (S/PDIF) */
143 #define SND_CTL_NAME_IEC958(expl,direction,what) "IEC958 " expl SND_CTL_NAME_##direction SND_CTL_NAME_IEC958_##what
147 typedef enum _snd_ctl_type {
148 /** Kernel level CTL */
150 /** Shared memory client CTL */
152 /** INET client CTL (not yet implemented) */
156 /** Non blocking mode \hideinitializer */
157 #define SND_CTL_NONBLOCK 0x0001
159 /** Async notification \hideinitializer */
160 #define SND_CTL_ASYNC 0x0002
163 typedef struct _snd_ctl snd_ctl_t;
165 /** Don't destroy the ctl handle when close */
166 #define SND_SCTL_NOFREE 0x0001
169 typedef struct _snd_sctl snd_sctl_t;
175 int snd_card_load(int card);
176 int snd_card_next(int *card);
177 int snd_card_get_index(const char *name);
178 int snd_card_get_name(int card, char **name);
179 int snd_card_get_longname(int card, char **name);
181 int snd_sctl_build(snd_sctl_t **ctl, snd_ctl_t *handle, snd_config_t *config,
182 void *private_data, int mode);
183 int snd_sctl_free(snd_sctl_t *handle);
184 int snd_sctl_install(snd_sctl_t *handle);
185 int snd_sctl_remove(snd_sctl_t *handle);
187 int snd_ctl_open(snd_ctl_t **ctl, const char *name, int mode);
188 int snd_ctl_close(snd_ctl_t *ctl);
189 int snd_ctl_nonblock(snd_ctl_t *ctl, int nonblock);
190 int snd_async_add_ctl_handler(snd_async_handler_t **handler, snd_ctl_t *ctl,
191 snd_async_callback_t callback, void *private_data);
192 snd_ctl_t *snd_async_handler_get_ctl(snd_async_handler_t *handler);
193 int snd_ctl_poll_descriptors_count(snd_ctl_t *ctl);
194 int snd_ctl_poll_descriptors(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int space);
195 int snd_ctl_subscribe_events(snd_ctl_t *ctl, int subscribe);
196 int snd_ctl_card_info(snd_ctl_t *ctl, snd_ctl_card_info_t *info);
197 int snd_ctl_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t * list);
198 int snd_ctl_elem_info(snd_ctl_t *ctl, snd_ctl_elem_info_t *info);
199 int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
200 int snd_ctl_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
201 int snd_ctl_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
202 int snd_ctl_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
203 int snd_ctl_hwdep_next_device(snd_ctl_t *ctl, int * device);
204 int snd_ctl_hwdep_info(snd_ctl_t *ctl, snd_hwdep_info_t * info);
205 int snd_ctl_pcm_next_device(snd_ctl_t *ctl, int *device);
206 int snd_ctl_pcm_info(snd_ctl_t *ctl, snd_pcm_info_t * info);
207 int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *ctl, int subdev);
208 int snd_ctl_rawmidi_next_device(snd_ctl_t *ctl, int * device);
209 int snd_ctl_rawmidi_info(snd_ctl_t *ctl, snd_rawmidi_info_t * info);
210 int snd_ctl_rawmidi_prefer_subdevice(snd_ctl_t *ctl, int subdev);
212 int snd_ctl_read(snd_ctl_t *ctl, snd_ctl_event_t *event);
213 int snd_ctl_wait(snd_ctl_t *ctl, int timeout);
214 const char *snd_ctl_name(snd_ctl_t *ctl);
215 snd_ctl_type_t snd_ctl_type(snd_ctl_t *ctl);
217 void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size);
218 const char *snd_ctl_elem_type_name(snd_ctl_elem_type_t type);
219 const char *snd_ctl_elem_iface_name(snd_ctl_elem_iface_t iface);
220 const char *snd_ctl_event_type_name(snd_ctl_event_type_t type);
222 unsigned int snd_ctl_event_elem_get_mask(const snd_ctl_event_t *obj);
223 unsigned int snd_ctl_event_elem_get_numid(const snd_ctl_event_t *obj);
224 void snd_ctl_event_elem_get_id(const snd_ctl_event_t *obj, snd_ctl_elem_id_t *ptr);
225 snd_ctl_elem_iface_t snd_ctl_event_elem_get_interface(const snd_ctl_event_t *obj);
226 unsigned int snd_ctl_event_elem_get_device(const snd_ctl_event_t *obj);
227 unsigned int snd_ctl_event_elem_get_subdevice(const snd_ctl_event_t *obj);
228 const char *snd_ctl_event_elem_get_name(const snd_ctl_event_t *obj);
229 unsigned int snd_ctl_event_elem_get_index(const snd_ctl_event_t *obj);
231 int snd_ctl_elem_list_alloc_space(snd_ctl_elem_list_t *obj, unsigned int entries);
232 void snd_ctl_elem_list_free_space(snd_ctl_elem_list_t *obj);
234 size_t snd_ctl_elem_id_sizeof(void);
236 * \brief allocate an invalid #snd_ctl_elem_id_t using standard alloca
237 * \param ptr returned pointer
239 #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)
240 int snd_ctl_elem_id_malloc(snd_ctl_elem_id_t **ptr);
241 void snd_ctl_elem_id_free(snd_ctl_elem_id_t *obj);
242 void snd_ctl_elem_id_clear(snd_ctl_elem_id_t *obj);
243 void snd_ctl_elem_id_copy(snd_ctl_elem_id_t *dst, const snd_ctl_elem_id_t *src);
244 unsigned int snd_ctl_elem_id_get_numid(const snd_ctl_elem_id_t *obj);
245 snd_ctl_elem_iface_t snd_ctl_elem_id_get_interface(const snd_ctl_elem_id_t *obj);
246 unsigned int snd_ctl_elem_id_get_device(const snd_ctl_elem_id_t *obj);
247 unsigned int snd_ctl_elem_id_get_subdevice(const snd_ctl_elem_id_t *obj);
248 const char *snd_ctl_elem_id_get_name(const snd_ctl_elem_id_t *obj);
249 unsigned int snd_ctl_elem_id_get_index(const snd_ctl_elem_id_t *obj);
250 void snd_ctl_elem_id_set_numid(snd_ctl_elem_id_t *obj, unsigned int val);
251 void snd_ctl_elem_id_set_interface(snd_ctl_elem_id_t *obj, snd_ctl_elem_iface_t val);
252 void snd_ctl_elem_id_set_device(snd_ctl_elem_id_t *obj, unsigned int val);
253 void snd_ctl_elem_id_set_subdevice(snd_ctl_elem_id_t *obj, unsigned int val);
254 void snd_ctl_elem_id_set_name(snd_ctl_elem_id_t *obj, const char *val);
255 void snd_ctl_elem_id_set_index(snd_ctl_elem_id_t *obj, unsigned int val);
257 size_t snd_ctl_card_info_sizeof(void);
259 * \brief allocate an invalid #snd_ctl_card_info_t using standard alloca
260 * \param ptr returned pointer
262 #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)
263 int snd_ctl_card_info_malloc(snd_ctl_card_info_t **ptr);
264 void snd_ctl_card_info_free(snd_ctl_card_info_t *obj);
265 void snd_ctl_card_info_clear(snd_ctl_card_info_t *obj);
266 void snd_ctl_card_info_copy(snd_ctl_card_info_t *dst, const snd_ctl_card_info_t *src);
267 int snd_ctl_card_info_get_card(const snd_ctl_card_info_t *obj);
268 const char *snd_ctl_card_info_get_id(const snd_ctl_card_info_t *obj);
269 const char *snd_ctl_card_info_get_driver(const snd_ctl_card_info_t *obj);
270 const char *snd_ctl_card_info_get_name(const snd_ctl_card_info_t *obj);
271 const char *snd_ctl_card_info_get_longname(const snd_ctl_card_info_t *obj);
272 const char *snd_ctl_card_info_get_mixername(const snd_ctl_card_info_t *obj);
273 const char *snd_ctl_card_info_get_components(const snd_ctl_card_info_t *obj);
275 size_t snd_ctl_event_sizeof(void);
277 * \brief allocate an invalid #snd_ctl_event_t using standard alloca
278 * \param ptr returned pointer
280 #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)
281 int snd_ctl_event_malloc(snd_ctl_event_t **ptr);
282 void snd_ctl_event_free(snd_ctl_event_t *obj);
283 void snd_ctl_event_clear(snd_ctl_event_t *obj);
284 void snd_ctl_event_copy(snd_ctl_event_t *dst, const snd_ctl_event_t *src);
285 snd_ctl_event_type_t snd_ctl_event_get_type(const snd_ctl_event_t *obj);
287 size_t snd_ctl_elem_list_sizeof(void);
289 * \brief allocate an invalid #snd_ctl_elem_list_t using standard alloca
290 * \param ptr returned pointer
292 #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)
293 int snd_ctl_elem_list_malloc(snd_ctl_elem_list_t **ptr);
294 void snd_ctl_elem_list_free(snd_ctl_elem_list_t *obj);
295 void snd_ctl_elem_list_clear(snd_ctl_elem_list_t *obj);
296 void snd_ctl_elem_list_copy(snd_ctl_elem_list_t *dst, const snd_ctl_elem_list_t *src);
297 void snd_ctl_elem_list_set_offset(snd_ctl_elem_list_t *obj, unsigned int val);
298 unsigned int snd_ctl_elem_list_get_used(const snd_ctl_elem_list_t *obj);
299 unsigned int snd_ctl_elem_list_get_count(const snd_ctl_elem_list_t *obj);
300 void snd_ctl_elem_list_get_id(const snd_ctl_elem_list_t *obj, unsigned int idx, snd_ctl_elem_id_t *ptr);
301 unsigned int snd_ctl_elem_list_get_numid(const snd_ctl_elem_list_t *obj, unsigned int idx);
302 snd_ctl_elem_iface_t snd_ctl_elem_list_get_interface(const snd_ctl_elem_list_t *obj, unsigned int idx);
303 unsigned int snd_ctl_elem_list_get_device(const snd_ctl_elem_list_t *obj, unsigned int idx);
304 unsigned int snd_ctl_elem_list_get_subdevice(const snd_ctl_elem_list_t *obj, unsigned int idx);
305 const char *snd_ctl_elem_list_get_name(const snd_ctl_elem_list_t *obj, unsigned int idx);
306 unsigned int snd_ctl_elem_list_get_index(const snd_ctl_elem_list_t *obj, unsigned int idx);
308 size_t snd_ctl_elem_info_sizeof(void);
310 * \brief allocate an invalid #snd_ctl_elem_info_t using standard alloca
311 * \param ptr returned pointer
313 #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)
314 int snd_ctl_elem_info_malloc(snd_ctl_elem_info_t **ptr);
315 void snd_ctl_elem_info_free(snd_ctl_elem_info_t *obj);
316 void snd_ctl_elem_info_clear(snd_ctl_elem_info_t *obj);
317 void snd_ctl_elem_info_copy(snd_ctl_elem_info_t *dst, const snd_ctl_elem_info_t *src);
318 snd_ctl_elem_type_t snd_ctl_elem_info_get_type(const snd_ctl_elem_info_t *obj);
319 int snd_ctl_elem_info_is_readable(const snd_ctl_elem_info_t *obj);
320 int snd_ctl_elem_info_is_writable(const snd_ctl_elem_info_t *obj);
321 int snd_ctl_elem_info_is_volatile(const snd_ctl_elem_info_t *obj);
322 int snd_ctl_elem_info_is_inactive(const snd_ctl_elem_info_t *obj);
323 int snd_ctl_elem_info_is_locked(const snd_ctl_elem_info_t *obj);
324 int snd_ctl_elem_info_is_owner(const snd_ctl_elem_info_t *obj);
325 int snd_ctl_elem_info_is_indirect(const snd_ctl_elem_info_t *obj);
326 pid_t snd_ctl_elem_info_get_owner(const snd_ctl_elem_info_t *obj);
327 unsigned int snd_ctl_elem_info_get_count(const snd_ctl_elem_info_t *obj);
328 long snd_ctl_elem_info_get_min(const snd_ctl_elem_info_t *obj);
329 long snd_ctl_elem_info_get_max(const snd_ctl_elem_info_t *obj);
330 long snd_ctl_elem_info_get_step(const snd_ctl_elem_info_t *obj);
331 unsigned int snd_ctl_elem_info_get_items(const snd_ctl_elem_info_t *obj);
332 void snd_ctl_elem_info_set_item(snd_ctl_elem_info_t *obj, unsigned int val);
333 const char *snd_ctl_elem_info_get_item_name(const snd_ctl_elem_info_t *obj);
334 void snd_ctl_elem_info_get_id(const snd_ctl_elem_info_t *obj, snd_ctl_elem_id_t *ptr);
335 unsigned int snd_ctl_elem_info_get_numid(const snd_ctl_elem_info_t *obj);
336 snd_ctl_elem_iface_t snd_ctl_elem_info_get_interface(const snd_ctl_elem_info_t *obj);
337 unsigned int snd_ctl_elem_info_get_device(const snd_ctl_elem_info_t *obj);
338 unsigned int snd_ctl_elem_info_get_subdevice(const snd_ctl_elem_info_t *obj);
339 const char *snd_ctl_elem_info_get_name(const snd_ctl_elem_info_t *obj);
340 unsigned int snd_ctl_elem_info_get_index(const snd_ctl_elem_info_t *obj);
341 void snd_ctl_elem_info_set_id(snd_ctl_elem_info_t *obj, const snd_ctl_elem_id_t *ptr);
342 void snd_ctl_elem_info_set_numid(snd_ctl_elem_info_t *obj, unsigned int val);
343 void snd_ctl_elem_info_set_interface(snd_ctl_elem_info_t *obj, snd_ctl_elem_iface_t val);
344 void snd_ctl_elem_info_set_device(snd_ctl_elem_info_t *obj, unsigned int val);
345 void snd_ctl_elem_info_set_subdevice(snd_ctl_elem_info_t *obj, unsigned int val);
346 void snd_ctl_elem_info_set_name(snd_ctl_elem_info_t *obj, const char *val);
347 void snd_ctl_elem_info_set_index(snd_ctl_elem_info_t *obj, unsigned int val);
349 size_t snd_ctl_elem_value_sizeof(void);
351 * \brief allocate an invalid #snd_ctl_elem_value_t using standard alloca
352 * \param ptr returned pointer
354 #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)
355 int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr);
356 void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj);
357 void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj);
358 void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src);
359 void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr);
360 unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj);
361 snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t *obj);
362 unsigned int snd_ctl_elem_value_get_device(const snd_ctl_elem_value_t *obj);
363 unsigned int snd_ctl_elem_value_get_subdevice(const snd_ctl_elem_value_t *obj);
364 const char *snd_ctl_elem_value_get_name(const snd_ctl_elem_value_t *obj);
365 unsigned int snd_ctl_elem_value_get_index(const snd_ctl_elem_value_t *obj);
366 void snd_ctl_elem_value_set_id(snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_t *ptr);
367 void snd_ctl_elem_value_set_numid(snd_ctl_elem_value_t *obj, unsigned int val);
368 void snd_ctl_elem_value_set_interface(snd_ctl_elem_value_t *obj, snd_ctl_elem_iface_t val);
369 void snd_ctl_elem_value_set_device(snd_ctl_elem_value_t *obj, unsigned int val);
370 void snd_ctl_elem_value_set_subdevice(snd_ctl_elem_value_t *obj, unsigned int val);
371 void snd_ctl_elem_value_set_name(snd_ctl_elem_value_t *obj, const char *val);
372 void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val);
373 int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int idx);
374 long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned int idx);
375 unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj, unsigned int idx);
376 unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsigned int idx);
377 void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
378 void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
379 void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val);
380 void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val);
381 const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj);
382 void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr);
383 void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr);
390 * \defgroup HControl Highlevel Control Interface
392 * The highlevel control interface.
396 /** HCTL element handle */
397 typedef struct _snd_hctl_elem snd_hctl_elem_t;
400 typedef struct _snd_hctl snd_hctl_t;
407 * \brief Compare function for sorting HCTL elements
408 * \param e1 First element
409 * \param e2 Second element
410 * \return -1 if e1 < e2, 0 if e1 == e2, 1 if e1 > e2
412 typedef int (*snd_hctl_compare_t)(const snd_hctl_elem_t *e1,
413 const snd_hctl_elem_t *e2);
414 int snd_hctl_compare_fast(const snd_hctl_elem_t *c1,
415 const snd_hctl_elem_t *c2);
417 * \brief HCTL callback function
418 * \param hctl HCTL handle
419 * \param mask event mask
420 * \param elem related HCTL element (if any)
421 * \return 0 on success otherwise a negative error code
423 typedef int (*snd_hctl_callback_t)(snd_hctl_t *hctl,
425 snd_hctl_elem_t *elem);
427 * \brief HCTL element callback function
428 * \param elem HCTL element
429 * \param mask event mask
430 * \return 0 on success otherwise a negative error code
432 typedef int (*snd_hctl_elem_callback_t)(snd_hctl_elem_t *elem,
435 int snd_hctl_open(snd_hctl_t **hctl, const char *name, int mode);
436 int snd_hctl_close(snd_hctl_t *hctl);
437 int snd_hctl_nonblock(snd_hctl_t *hctl, int nonblock);
438 int snd_hctl_poll_descriptors_count(snd_hctl_t *hctl);
439 int snd_hctl_poll_descriptors(snd_hctl_t *hctl, struct pollfd *pfds, unsigned int space);
440 unsigned int snd_hctl_get_count(snd_hctl_t *hctl);
441 int snd_hctl_set_compare(snd_hctl_t *hctl, snd_hctl_compare_t hsort);
442 snd_hctl_elem_t *snd_hctl_first_elem(snd_hctl_t *hctl);
443 snd_hctl_elem_t *snd_hctl_last_elem(snd_hctl_t *hctl);
444 snd_hctl_elem_t *snd_hctl_find_elem(snd_hctl_t *hctl, const snd_ctl_elem_id_t *id);
445 void snd_hctl_set_callback(snd_hctl_t *hctl, snd_hctl_callback_t callback);
446 void snd_hctl_set_callback_private(snd_hctl_t *hctl, void *data);
447 void *snd_hctl_get_callback_private(snd_hctl_t *hctl);
448 int snd_hctl_load(snd_hctl_t *hctl);
449 int snd_hctl_free(snd_hctl_t *hctl);
450 int snd_hctl_handle_events(snd_hctl_t *hctl);
451 const char *snd_hctl_name(snd_hctl_t *hctl);
452 int snd_hctl_wait(snd_hctl_t *hctl, int timeout);
454 snd_hctl_elem_t *snd_hctl_elem_next(snd_hctl_elem_t *elem);
455 snd_hctl_elem_t *snd_hctl_elem_prev(snd_hctl_elem_t *elem);
456 int snd_hctl_elem_info(snd_hctl_elem_t *elem, snd_ctl_elem_info_t * info);
457 int snd_hctl_elem_read(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
458 int snd_hctl_elem_write(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
460 snd_hctl_t *snd_hctl_elem_get_hctl(snd_hctl_elem_t *elem);
462 void snd_hctl_elem_get_id(const snd_hctl_elem_t *obj, snd_ctl_elem_id_t *ptr);
463 unsigned int snd_hctl_elem_get_numid(const snd_hctl_elem_t *obj);
464 snd_ctl_elem_iface_t snd_hctl_elem_get_interface(const snd_hctl_elem_t *obj);
465 unsigned int snd_hctl_elem_get_device(const snd_hctl_elem_t *obj);
466 unsigned int snd_hctl_elem_get_subdevice(const snd_hctl_elem_t *obj);
467 const char *snd_hctl_elem_get_name(const snd_hctl_elem_t *obj);
468 unsigned int snd_hctl_elem_get_index(const snd_hctl_elem_t *obj);
469 void snd_hctl_elem_set_callback(snd_hctl_elem_t *obj, snd_hctl_elem_callback_t val);
470 void * snd_hctl_elem_get_callback_private(const snd_hctl_elem_t *obj);
471 void snd_hctl_elem_set_callback_private(snd_hctl_elem_t *obj, void * val);
480 #endif /* __ALSA_CONTROL_H */