1 #ifndef __SOUND_PCM_PARAMS_H
2 #define __SOUND_PCM_PARAMS_H
6 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <sound/pcm.h>
27 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
28 struct snd_pcm_hw_params *params,
29 snd_pcm_hw_param_t var, int *dir);
30 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
31 struct snd_pcm_hw_params *params,
32 snd_pcm_hw_param_t var, int *dir);
33 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
34 snd_pcm_hw_param_t var, int *dir);
36 #define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
37 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
38 #define MASK_OFS(i) ((i) >> 5)
39 #define MASK_BIT(i) (1U << ((i) & 31))
41 static inline size_t snd_mask_sizeof(void)
43 return sizeof(struct snd_mask);
46 static inline void snd_mask_none(struct snd_mask *mask)
48 memset(mask, 0, sizeof(*mask));
51 static inline void snd_mask_any(struct snd_mask *mask)
53 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
56 static inline int snd_mask_empty(const struct snd_mask *mask)
59 for (i = 0; i < SNDRV_MASK_SIZE; i++)
65 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
68 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
70 return __ffs(mask->bits[i]) + (i << 5);
75 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
78 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
80 return __fls(mask->bits[i]) + (i << 5);
85 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
87 mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
90 /* Most of drivers need only this one */
91 static inline void snd_mask_set_format(struct snd_mask *mask,
92 snd_pcm_format_t format)
94 snd_mask_set(mask, (__force unsigned int)format);
97 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
99 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
102 static inline void snd_mask_set_range(struct snd_mask *mask,
103 unsigned int from, unsigned int to)
106 for (i = from; i <= to; i++)
107 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
110 static inline void snd_mask_reset_range(struct snd_mask *mask,
111 unsigned int from, unsigned int to)
114 for (i = from; i <= to; i++)
115 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
118 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
121 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
123 mask->bits[MASK_OFS(val)] = v;
126 static inline void snd_mask_intersect(struct snd_mask *mask,
127 const struct snd_mask *v)
130 for (i = 0; i < SNDRV_MASK_SIZE; i++)
131 mask->bits[i] &= v->bits[i];
134 static inline int snd_mask_eq(const struct snd_mask *mask,
135 const struct snd_mask *v)
137 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
140 static inline void snd_mask_copy(struct snd_mask *mask,
141 const struct snd_mask *v)
146 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
148 return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
151 static inline int snd_mask_single(const struct snd_mask *mask)
154 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
157 if (mask->bits[i] & (mask->bits[i] - 1))
166 static inline int snd_mask_refine(struct snd_mask *mask,
167 const struct snd_mask *v)
170 snd_mask_copy(&old, mask);
171 snd_mask_intersect(mask, v);
172 if (snd_mask_empty(mask))
174 return !snd_mask_eq(mask, &old);
177 static inline int snd_mask_refine_first(struct snd_mask *mask)
179 if (snd_mask_single(mask))
181 snd_mask_leave(mask, snd_mask_min(mask));
185 static inline int snd_mask_refine_last(struct snd_mask *mask)
187 if (snd_mask_single(mask))
189 snd_mask_leave(mask, snd_mask_max(mask));
193 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
195 if (snd_mask_min(mask) >= val)
197 snd_mask_reset_range(mask, 0, val - 1);
198 if (snd_mask_empty(mask))
203 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
205 if (snd_mask_max(mask) <= val)
207 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
208 if (snd_mask_empty(mask))
213 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
216 changed = !snd_mask_single(mask);
217 snd_mask_leave(mask, val);
218 if (snd_mask_empty(mask))
223 static inline int snd_mask_value(const struct snd_mask *mask)
225 return snd_mask_min(mask);
228 static inline void snd_interval_any(struct snd_interval *i)
238 static inline void snd_interval_none(struct snd_interval *i)
243 static inline int snd_interval_checkempty(const struct snd_interval *i)
245 return (i->min > i->max ||
246 (i->min == i->max && (i->openmin || i->openmax)));
249 static inline int snd_interval_empty(const struct snd_interval *i)
254 static inline int snd_interval_single(const struct snd_interval *i)
256 return (i->min == i->max ||
257 (i->min + 1 == i->max && (i->openmin || i->openmax)));
260 static inline int snd_interval_value(const struct snd_interval *i)
262 if (i->openmin && !i->openmax)
267 static inline int snd_interval_min(const struct snd_interval *i)
272 static inline int snd_interval_max(const struct snd_interval *i)
281 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
283 return !((i->min > val || (i->min == val && i->openmin) ||
284 i->max < val || (i->max == val && i->openmax)));
287 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
292 static inline int snd_interval_setinteger(struct snd_interval *i)
296 if (i->openmin && i->openmax && i->min == i->max)
302 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
308 return i1->min == i2->min && i1->openmin == i2->openmin &&
309 i1->max == i2->max && i1->openmax == i2->openmax;
313 * params_access - get the access type from the hw params
316 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
318 return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
319 SNDRV_PCM_HW_PARAM_ACCESS));
323 * params_format - get the sample format from the hw params
326 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
328 return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
329 SNDRV_PCM_HW_PARAM_FORMAT));
333 * params_subformat - get the sample subformat from the hw params
336 static inline snd_pcm_subformat_t
337 params_subformat(const struct snd_pcm_hw_params *p)
339 return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
340 SNDRV_PCM_HW_PARAM_SUBFORMAT));
344 * params_period_bytes - get the period size (in bytes) from the hw params
347 static inline unsigned int
348 params_period_bytes(const struct snd_pcm_hw_params *p)
350 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
354 * params_width - get the number of bits of the sample format from the hw params
357 * This function returns the number of bits per sample that the selected sample
358 * format of the hw params has.
360 static inline int params_width(const struct snd_pcm_hw_params *p)
362 return snd_pcm_format_width(params_format(p));
366 * params_physical_width - get the storage size of the sample format from the hw params
369 * This functions returns the number of bits per sample that the selected sample
370 * format of the hw params takes up in memory. This will be equal or larger than
373 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
375 return snd_pcm_format_physical_width(params_format(p));
379 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
381 snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
384 #endif /* __SOUND_PCM_PARAMS_H */