1 /****************************************************************************
6 ****************************************************************************/
9 * \defgroup Control Control Interface
10 * The control interface.
14 /** dlsym version for interface entry callback */
15 #define SND_CONTROL_DLSYM_VERSION _dlsym_control_001
17 /** IEC958 structure */
18 typedef struct sndrv_aes_iec958 snd_aes_iec958_t;
20 /** CTL card info container */
21 typedef struct _snd_ctl_card_info snd_ctl_card_info_t;
23 /** CTL element identificator container */
24 typedef struct _snd_ctl_elem_id snd_ctl_elem_id_t;
26 /** CTL element identificator list container */
27 typedef struct _snd_ctl_elem_list snd_ctl_elem_list_t;
29 /** CTL element info container */
30 typedef struct _snd_ctl_elem_info snd_ctl_elem_info_t;
32 /** CTL element value container */
33 typedef struct _snd_ctl_elem_value snd_ctl_elem_value_t;
35 /** CTL event container */
36 typedef struct _snd_ctl_event snd_ctl_event_t;
38 /** CTL element type */
39 typedef enum _snd_ctl_elem_type {
41 SND_CTL_ELEM_TYPE_NONE = SNDRV_CTL_ELEM_TYPE_NONE,
42 /** Boolean contents */
43 SND_CTL_ELEM_TYPE_BOOLEAN = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
44 /** Integer contents */
45 SND_CTL_ELEM_TYPE_INTEGER = SNDRV_CTL_ELEM_TYPE_INTEGER,
46 /** Enumerated contents */
47 SND_CTL_ELEM_TYPE_ENUMERATED = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
49 SND_CTL_ELEM_TYPE_BYTES = SNDRV_CTL_ELEM_TYPE_BYTES,
50 /** IEC958 (S/PDIF) setting content */
51 SND_CTL_ELEM_TYPE_IEC958 = SNDRV_CTL_ELEM_TYPE_IEC958,
52 SND_CTL_ELEM_TYPE_LAST = SNDRV_CTL_ELEM_TYPE_LAST,
53 } snd_ctl_elem_type_t;
55 /** CTL related interface */
56 typedef enum _snd_ctl_elem_iface {
58 SND_CTL_ELEM_IFACE_CARD = SNDRV_CTL_ELEM_IFACE_CARD,
59 /** Hardware dependent device */
60 SND_CTL_ELEM_IFACE_HWDEP = SNDRV_CTL_ELEM_IFACE_HWDEP,
62 SND_CTL_ELEM_IFACE_MIXER = SNDRV_CTL_ELEM_IFACE_MIXER,
64 SND_CTL_ELEM_IFACE_PCM = SNDRV_CTL_ELEM_IFACE_PCM,
66 SND_CTL_ELEM_IFACE_RAWMIDI = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
68 SND_CTL_ELEM_IFACE_TIMER = SNDRV_CTL_ELEM_IFACE_TIMER,
70 SND_CTL_ELEM_IFACE_SEQUENCER = SNDRV_CTL_ELEM_IFACE_SEQUENCER,
71 SND_CTL_ELEM_IFACE_LAST = SNDRV_CTL_ELEM_IFACE_LAST,
72 } snd_ctl_elem_iface_t;
75 typedef enum _snd_ctl_event_type {
76 /** Elements related event */
77 SND_CTL_EVENT_ELEM = SNDRV_CTL_EVENT_ELEM,
78 SND_CTL_EVENT_LAST = SNDRV_CTL_EVENT_LAST,
79 }snd_ctl_event_type_t;
81 /** Element has been removed (Warning: test this first and if set don't
82 * test the other masks) \hideinitializer */
83 #define SND_CTL_EVENT_MASK_REMOVE SNDRV_CTL_EVENT_MASK_REMOVE
84 /** Element has been added \hideinitializer */
85 #define SND_CTL_EVENT_MASK_ADD SNDRV_CTL_EVENT_MASK_ADD
86 /** Element info has been changed \hideinitializer */
87 #define SND_CTL_EVENT_MASK_INFO SNDRV_CTL_EVENT_MASK_INFO
88 /** Element value has been changed \hideinitializer */
89 #define SND_CTL_EVENT_MASK_VALUE SNDRV_CTL_EVENT_MASK_VALUE
91 /** Element name for IEC958 (S/PDIF) */
92 #define SND_CTL_NAME_IEC958 SNDRV_CTL_NAME_IEC958
95 typedef enum _snd_ctl_type {
96 /** Kernel level CTL */
98 /** Shared memory client CTL */
100 /** INET client CTL (not yet implemented) */
104 /** Non blocking mode \hideinitializer */
105 #define SND_CTL_NONBLOCK 0x0001
107 /** Async notification \hideinitializer */
108 #define SND_CTL_ASYNC 0x0002
111 typedef struct _snd_ctl snd_ctl_t;
113 /** Don't destroy the ctl handle when close */
114 #define SND_SCTL_NOFREE 0x0001
117 typedef struct _snd_sctl snd_sctl_t;
123 int snd_card_load(int card);
124 int snd_card_next(int *card);
125 int snd_card_get_index(const char *name);
126 int snd_card_get_name(int card, char **name);
127 int snd_card_get_longname(int card, char **name);
129 int snd_sctl_build(snd_sctl_t **ctl, snd_ctl_t *handle, snd_config_t *config,
130 void *private_data, int mode);
131 int snd_sctl_free(snd_sctl_t *handle);
132 int snd_sctl_install(snd_sctl_t *handle);
133 int snd_sctl_remove(snd_sctl_t *handle);
135 int snd_ctl_open(snd_ctl_t **ctl, const char *name, int mode);
136 int snd_ctl_close(snd_ctl_t *ctl);
137 int snd_ctl_nonblock(snd_ctl_t *ctl, int nonblock);
138 int snd_async_add_ctl_handler(snd_async_handler_t **handler, snd_ctl_t *ctl,
139 snd_async_callback_t callback, void *private_data);
140 snd_ctl_t *snd_async_handler_get_ctl(snd_async_handler_t *handler);
141 int snd_ctl_poll_descriptors_count(snd_ctl_t *ctl);
142 int snd_ctl_poll_descriptors(snd_ctl_t *ctl, struct pollfd *pfds, unsigned int space);
143 int snd_ctl_subscribe_events(snd_ctl_t *ctl, int subscribe);
144 int snd_ctl_card_info(snd_ctl_t *ctl, snd_ctl_card_info_t *info);
145 int snd_ctl_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t * list);
146 int snd_ctl_elem_info(snd_ctl_t *ctl, snd_ctl_elem_info_t *info);
147 int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
148 int snd_ctl_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *value);
149 int snd_ctl_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
150 int snd_ctl_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id);
151 int snd_ctl_hwdep_next_device(snd_ctl_t *ctl, int * device);
152 int snd_ctl_hwdep_info(snd_ctl_t *ctl, snd_hwdep_info_t * info);
153 int snd_ctl_pcm_next_device(snd_ctl_t *ctl, int *device);
154 int snd_ctl_pcm_info(snd_ctl_t *ctl, snd_pcm_info_t * info);
155 int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *ctl, int subdev);
156 int snd_ctl_rawmidi_next_device(snd_ctl_t *ctl, int * device);
157 int snd_ctl_rawmidi_info(snd_ctl_t *ctl, snd_rawmidi_info_t * info);
158 int snd_ctl_rawmidi_prefer_subdevice(snd_ctl_t *ctl, int subdev);
160 int snd_ctl_read(snd_ctl_t *ctl, snd_ctl_event_t *event);
161 int snd_ctl_wait(snd_ctl_t *ctl, int timeout);
162 const char *snd_ctl_name(snd_ctl_t *ctl);
163 snd_ctl_type_t snd_ctl_type(snd_ctl_t *ctl);
165 void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size);
166 const char *snd_ctl_elem_type_name(snd_ctl_elem_type_t type);
167 const char *snd_ctl_elem_iface_name(snd_ctl_elem_iface_t iface);
168 const char *snd_ctl_event_type_name(snd_ctl_event_type_t type);
170 unsigned int snd_ctl_event_elem_get_mask(const snd_ctl_event_t *obj);
171 unsigned int snd_ctl_event_elem_get_numid(const snd_ctl_event_t *obj);
172 void snd_ctl_event_elem_get_id(const snd_ctl_event_t *obj, snd_ctl_elem_id_t *ptr);
173 snd_ctl_elem_iface_t snd_ctl_event_elem_get_interface(const snd_ctl_event_t *obj);
174 unsigned int snd_ctl_event_elem_get_device(const snd_ctl_event_t *obj);
175 unsigned int snd_ctl_event_elem_get_subdevice(const snd_ctl_event_t *obj);
176 const char *snd_ctl_event_elem_get_name(const snd_ctl_event_t *obj);
177 unsigned int snd_ctl_event_elem_get_index(const snd_ctl_event_t *obj);
179 int snd_ctl_elem_list_alloc_space(snd_ctl_elem_list_t *obj, unsigned int entries);
180 void snd_ctl_elem_list_free_space(snd_ctl_elem_list_t *obj);
182 size_t snd_ctl_elem_id_sizeof(void);
184 * \brief allocate an invalid #snd_ctl_elem_id_t using standard alloca
185 * \param ptr returned pointer
187 #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)
188 int snd_ctl_elem_id_malloc(snd_ctl_elem_id_t **ptr);
189 void snd_ctl_elem_id_free(snd_ctl_elem_id_t *obj);
190 void snd_ctl_elem_id_clear(snd_ctl_elem_id_t *obj);
191 void snd_ctl_elem_id_copy(snd_ctl_elem_id_t *dst, const snd_ctl_elem_id_t *src);
192 unsigned int snd_ctl_elem_id_get_numid(const snd_ctl_elem_id_t *obj);
193 snd_ctl_elem_iface_t snd_ctl_elem_id_get_interface(const snd_ctl_elem_id_t *obj);
194 unsigned int snd_ctl_elem_id_get_device(const snd_ctl_elem_id_t *obj);
195 unsigned int snd_ctl_elem_id_get_subdevice(const snd_ctl_elem_id_t *obj);
196 const char *snd_ctl_elem_id_get_name(const snd_ctl_elem_id_t *obj);
197 unsigned int snd_ctl_elem_id_get_index(const snd_ctl_elem_id_t *obj);
198 void snd_ctl_elem_id_set_numid(snd_ctl_elem_id_t *obj, unsigned int val);
199 void snd_ctl_elem_id_set_interface(snd_ctl_elem_id_t *obj, snd_ctl_elem_iface_t val);
200 void snd_ctl_elem_id_set_device(snd_ctl_elem_id_t *obj, unsigned int val);
201 void snd_ctl_elem_id_set_subdevice(snd_ctl_elem_id_t *obj, unsigned int val);
202 void snd_ctl_elem_id_set_name(snd_ctl_elem_id_t *obj, const char *val);
203 void snd_ctl_elem_id_set_index(snd_ctl_elem_id_t *obj, unsigned int val);
205 size_t snd_ctl_card_info_sizeof(void);
207 * \brief allocate an invalid #snd_ctl_card_info_t using standard alloca
208 * \param ptr returned pointer
210 #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)
211 int snd_ctl_card_info_malloc(snd_ctl_card_info_t **ptr);
212 void snd_ctl_card_info_free(snd_ctl_card_info_t *obj);
213 void snd_ctl_card_info_clear(snd_ctl_card_info_t *obj);
214 void snd_ctl_card_info_copy(snd_ctl_card_info_t *dst, const snd_ctl_card_info_t *src);
215 int snd_ctl_card_info_get_card(const snd_ctl_card_info_t *obj);
216 const char *snd_ctl_card_info_get_id(const snd_ctl_card_info_t *obj);
217 const char *snd_ctl_card_info_get_driver(const snd_ctl_card_info_t *obj);
218 const char *snd_ctl_card_info_get_name(const snd_ctl_card_info_t *obj);
219 const char *snd_ctl_card_info_get_longname(const snd_ctl_card_info_t *obj);
220 const char *snd_ctl_card_info_get_mixername(const snd_ctl_card_info_t *obj);
221 const char *snd_ctl_card_info_get_components(const snd_ctl_card_info_t *obj);
223 size_t snd_ctl_event_sizeof(void);
225 * \brief allocate an invalid #snd_ctl_event_t using standard alloca
226 * \param ptr returned pointer
228 #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)
229 int snd_ctl_event_malloc(snd_ctl_event_t **ptr);
230 void snd_ctl_event_free(snd_ctl_event_t *obj);
231 void snd_ctl_event_clear(snd_ctl_event_t *obj);
232 void snd_ctl_event_copy(snd_ctl_event_t *dst, const snd_ctl_event_t *src);
233 snd_ctl_event_type_t snd_ctl_event_get_type(const snd_ctl_event_t *obj);
235 size_t snd_ctl_elem_list_sizeof(void);
237 * \brief allocate an invalid #snd_ctl_elem_list_t using standard alloca
238 * \param ptr returned pointer
240 #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)
241 int snd_ctl_elem_list_malloc(snd_ctl_elem_list_t **ptr);
242 void snd_ctl_elem_list_free(snd_ctl_elem_list_t *obj);
243 void snd_ctl_elem_list_clear(snd_ctl_elem_list_t *obj);
244 void snd_ctl_elem_list_copy(snd_ctl_elem_list_t *dst, const snd_ctl_elem_list_t *src);
245 void snd_ctl_elem_list_set_offset(snd_ctl_elem_list_t *obj, unsigned int val);
246 unsigned int snd_ctl_elem_list_get_used(const snd_ctl_elem_list_t *obj);
247 unsigned int snd_ctl_elem_list_get_count(const snd_ctl_elem_list_t *obj);
248 void snd_ctl_elem_list_get_id(const snd_ctl_elem_list_t *obj, unsigned int idx, snd_ctl_elem_id_t *ptr);
249 unsigned int snd_ctl_elem_list_get_numid(const snd_ctl_elem_list_t *obj, unsigned int idx);
250 snd_ctl_elem_iface_t snd_ctl_elem_list_get_interface(const snd_ctl_elem_list_t *obj, unsigned int idx);
251 unsigned int snd_ctl_elem_list_get_device(const snd_ctl_elem_list_t *obj, unsigned int idx);
252 unsigned int snd_ctl_elem_list_get_subdevice(const snd_ctl_elem_list_t *obj, unsigned int idx);
253 const char *snd_ctl_elem_list_get_name(const snd_ctl_elem_list_t *obj, unsigned int idx);
254 unsigned int snd_ctl_elem_list_get_index(const snd_ctl_elem_list_t *obj, unsigned int idx);
256 size_t snd_ctl_elem_info_sizeof(void);
258 * \brief allocate an invalid #snd_ctl_elem_info_t using standard alloca
259 * \param ptr returned pointer
261 #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)
262 int snd_ctl_elem_info_malloc(snd_ctl_elem_info_t **ptr);
263 void snd_ctl_elem_info_free(snd_ctl_elem_info_t *obj);
264 void snd_ctl_elem_info_clear(snd_ctl_elem_info_t *obj);
265 void snd_ctl_elem_info_copy(snd_ctl_elem_info_t *dst, const snd_ctl_elem_info_t *src);
266 snd_ctl_elem_type_t snd_ctl_elem_info_get_type(const snd_ctl_elem_info_t *obj);
267 int snd_ctl_elem_info_is_readable(const snd_ctl_elem_info_t *obj);
268 int snd_ctl_elem_info_is_writable(const snd_ctl_elem_info_t *obj);
269 int snd_ctl_elem_info_is_volatile(const snd_ctl_elem_info_t *obj);
270 int snd_ctl_elem_info_is_inactive(const snd_ctl_elem_info_t *obj);
271 int snd_ctl_elem_info_is_locked(const snd_ctl_elem_info_t *obj);
272 int snd_ctl_elem_info_is_owner(const snd_ctl_elem_info_t *obj);
273 int snd_ctl_elem_info_is_indirect(const snd_ctl_elem_info_t *obj);
274 pid_t snd_ctl_elem_info_get_owner(const snd_ctl_elem_info_t *obj);
275 unsigned int snd_ctl_elem_info_get_count(const snd_ctl_elem_info_t *obj);
276 long snd_ctl_elem_info_get_min(const snd_ctl_elem_info_t *obj);
277 long snd_ctl_elem_info_get_max(const snd_ctl_elem_info_t *obj);
278 long snd_ctl_elem_info_get_step(const snd_ctl_elem_info_t *obj);
279 unsigned int snd_ctl_elem_info_get_items(const snd_ctl_elem_info_t *obj);
280 void snd_ctl_elem_info_set_item(snd_ctl_elem_info_t *obj, unsigned int val);
281 const char *snd_ctl_elem_info_get_item_name(const snd_ctl_elem_info_t *obj);
282 void snd_ctl_elem_info_get_id(const snd_ctl_elem_info_t *obj, snd_ctl_elem_id_t *ptr);
283 unsigned int snd_ctl_elem_info_get_numid(const snd_ctl_elem_info_t *obj);
284 snd_ctl_elem_iface_t snd_ctl_elem_info_get_interface(const snd_ctl_elem_info_t *obj);
285 unsigned int snd_ctl_elem_info_get_device(const snd_ctl_elem_info_t *obj);
286 unsigned int snd_ctl_elem_info_get_subdevice(const snd_ctl_elem_info_t *obj);
287 const char *snd_ctl_elem_info_get_name(const snd_ctl_elem_info_t *obj);
288 unsigned int snd_ctl_elem_info_get_index(const snd_ctl_elem_info_t *obj);
289 void snd_ctl_elem_info_set_id(snd_ctl_elem_info_t *obj, const snd_ctl_elem_id_t *ptr);
290 void snd_ctl_elem_info_set_numid(snd_ctl_elem_info_t *obj, unsigned int val);
291 void snd_ctl_elem_info_set_interface(snd_ctl_elem_info_t *obj, snd_ctl_elem_iface_t val);
292 void snd_ctl_elem_info_set_device(snd_ctl_elem_info_t *obj, unsigned int val);
293 void snd_ctl_elem_info_set_subdevice(snd_ctl_elem_info_t *obj, unsigned int val);
294 void snd_ctl_elem_info_set_name(snd_ctl_elem_info_t *obj, const char *val);
295 void snd_ctl_elem_info_set_index(snd_ctl_elem_info_t *obj, unsigned int val);
297 size_t snd_ctl_elem_value_sizeof(void);
299 * \brief allocate an invalid #snd_ctl_elem_value_t using standard alloca
300 * \param ptr returned pointer
302 #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)
303 int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr);
304 void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj);
305 void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj);
306 void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src);
307 void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr);
308 unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj);
309 snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t *obj);
310 unsigned int snd_ctl_elem_value_get_device(const snd_ctl_elem_value_t *obj);
311 unsigned int snd_ctl_elem_value_get_subdevice(const snd_ctl_elem_value_t *obj);
312 const char *snd_ctl_elem_value_get_name(const snd_ctl_elem_value_t *obj);
313 unsigned int snd_ctl_elem_value_get_index(const snd_ctl_elem_value_t *obj);
314 void snd_ctl_elem_value_set_id(snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_t *ptr);
315 void snd_ctl_elem_value_set_numid(snd_ctl_elem_value_t *obj, unsigned int val);
316 void snd_ctl_elem_value_set_interface(snd_ctl_elem_value_t *obj, snd_ctl_elem_iface_t val);
317 void snd_ctl_elem_value_set_device(snd_ctl_elem_value_t *obj, unsigned int val);
318 void snd_ctl_elem_value_set_subdevice(snd_ctl_elem_value_t *obj, unsigned int val);
319 void snd_ctl_elem_value_set_name(snd_ctl_elem_value_t *obj, const char *val);
320 void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val);
321 int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int idx);
322 long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned int idx);
323 unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj, unsigned int idx);
324 unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsigned int idx);
325 void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
326 void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx, long val);
327 void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val);
328 void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val);
329 const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj);
330 void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr);
331 void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr);
338 * \defgroup HControl Highlevel Control Interface
340 * The highlevel control interface.
344 /** HCTL element handle */
345 typedef struct _snd_hctl_elem snd_hctl_elem_t;
348 typedef struct _snd_hctl snd_hctl_t;
355 * \brief Compare function for sorting HCTL elements
356 * \param e1 First element
357 * \param e2 Second element
358 * \return -1 if e1 < e2, 0 if e1 == e2, 1 if e1 > e2
360 typedef int (*snd_hctl_compare_t)(const snd_hctl_elem_t *e1,
361 const snd_hctl_elem_t *e2);
362 int snd_hctl_compare_fast(const snd_hctl_elem_t *c1,
363 const snd_hctl_elem_t *c2);
365 * \brief HCTL callback function
366 * \param hctl HCTL handle
367 * \param mask event mask
368 * \param elem related HCTL element (if any)
369 * \return 0 on success otherwise a negative error code
371 typedef int (*snd_hctl_callback_t)(snd_hctl_t *hctl,
373 snd_hctl_elem_t *elem);
375 * \brief HCTL element callback function
376 * \param elem HCTL element
377 * \param mask event mask
378 * \return 0 on success otherwise a negative error code
380 typedef int (*snd_hctl_elem_callback_t)(snd_hctl_elem_t *elem,
383 int snd_hctl_open(snd_hctl_t **hctl, const char *name, int mode);
384 int snd_hctl_close(snd_hctl_t *hctl);
385 int snd_hctl_nonblock(snd_hctl_t *hctl, int nonblock);
386 int snd_hctl_poll_descriptors_count(snd_hctl_t *hctl);
387 int snd_hctl_poll_descriptors(snd_hctl_t *hctl, struct pollfd *pfds, unsigned int space);
388 unsigned int snd_hctl_get_count(snd_hctl_t *hctl);
389 int snd_hctl_set_compare(snd_hctl_t *hctl, snd_hctl_compare_t hsort);
390 snd_hctl_elem_t *snd_hctl_first_elem(snd_hctl_t *hctl);
391 snd_hctl_elem_t *snd_hctl_last_elem(snd_hctl_t *hctl);
392 snd_hctl_elem_t *snd_hctl_find_elem(snd_hctl_t *hctl, const snd_ctl_elem_id_t *id);
393 void snd_hctl_set_callback(snd_hctl_t *hctl, snd_hctl_callback_t callback);
394 void snd_hctl_set_callback_private(snd_hctl_t *hctl, void *data);
395 void *snd_hctl_get_callback_private(snd_hctl_t *hctl);
396 int snd_hctl_load(snd_hctl_t *hctl);
397 int snd_hctl_free(snd_hctl_t *hctl);
398 int snd_hctl_handle_events(snd_hctl_t *hctl);
399 const char *snd_hctl_name(snd_hctl_t *hctl);
400 int snd_hctl_wait(snd_hctl_t *hctl, int timeout);
402 snd_hctl_elem_t *snd_hctl_elem_next(snd_hctl_elem_t *elem);
403 snd_hctl_elem_t *snd_hctl_elem_prev(snd_hctl_elem_t *elem);
404 int snd_hctl_elem_info(snd_hctl_elem_t *elem, snd_ctl_elem_info_t * info);
405 int snd_hctl_elem_read(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
406 int snd_hctl_elem_write(snd_hctl_elem_t *elem, snd_ctl_elem_value_t * value);
408 snd_hctl_t *snd_hctl_elem_get_hctl(snd_hctl_elem_t *elem);
410 void snd_hctl_elem_get_id(const snd_hctl_elem_t *obj, snd_ctl_elem_id_t *ptr);
411 unsigned int snd_hctl_elem_get_numid(const snd_hctl_elem_t *obj);
412 snd_ctl_elem_iface_t snd_hctl_elem_get_interface(const snd_hctl_elem_t *obj);
413 unsigned int snd_hctl_elem_get_device(const snd_hctl_elem_t *obj);
414 unsigned int snd_hctl_elem_get_subdevice(const snd_hctl_elem_t *obj);
415 const char *snd_hctl_elem_get_name(const snd_hctl_elem_t *obj);
416 unsigned int snd_hctl_elem_get_index(const snd_hctl_elem_t *obj);
417 void snd_hctl_elem_set_callback(snd_hctl_elem_t *obj, snd_hctl_elem_callback_t val);
418 void * snd_hctl_elem_get_callback_private(const snd_hctl_elem_t *obj);
419 void snd_hctl_elem_set_callback_private(snd_hctl_elem_t *obj, void * val);