1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_PCM_PARAMS_H
3 #define __SOUND_PCM_PARAMS_H
7 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
10 #include <sound/pcm.h>
12 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
13 struct snd_pcm_hw_params *params,
14 snd_pcm_hw_param_t var, int *dir);
15 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
16 struct snd_pcm_hw_params *params,
17 snd_pcm_hw_param_t var, int *dir);
18 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
19 snd_pcm_hw_param_t var, int *dir);
21 #define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
22 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
23 #define MASK_OFS(i) ((i) >> 5)
24 #define MASK_BIT(i) (1U << ((i) & 31))
26 static inline void snd_mask_none(struct snd_mask *mask)
28 memset(mask, 0, sizeof(*mask));
31 static inline void snd_mask_any(struct snd_mask *mask)
33 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
36 static inline int snd_mask_empty(const struct snd_mask *mask)
39 for (i = 0; i < SNDRV_MASK_SIZE; i++)
45 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
48 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
50 return __ffs(mask->bits[i]) + (i << 5);
55 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
58 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
60 return __fls(mask->bits[i]) + (i << 5);
65 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
67 mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
70 /* Most of drivers need only this one */
71 static inline void snd_mask_set_format(struct snd_mask *mask,
72 snd_pcm_format_t format)
74 snd_mask_set(mask, (__force unsigned int)format);
77 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
79 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
82 static inline void snd_mask_set_range(struct snd_mask *mask,
83 unsigned int from, unsigned int to)
86 for (i = from; i <= to; i++)
87 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
90 static inline void snd_mask_reset_range(struct snd_mask *mask,
91 unsigned int from, unsigned int to)
94 for (i = from; i <= to; i++)
95 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
98 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
101 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
103 mask->bits[MASK_OFS(val)] = v;
106 static inline void snd_mask_intersect(struct snd_mask *mask,
107 const struct snd_mask *v)
110 for (i = 0; i < SNDRV_MASK_SIZE; i++)
111 mask->bits[i] &= v->bits[i];
114 static inline int snd_mask_eq(const struct snd_mask *mask,
115 const struct snd_mask *v)
117 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
120 static inline void snd_mask_copy(struct snd_mask *mask,
121 const struct snd_mask *v)
126 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
128 return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
131 /* Most of drivers need only this one */
132 static inline int snd_mask_test_format(const struct snd_mask *mask,
133 snd_pcm_format_t format)
135 return snd_mask_test(mask, (__force unsigned int)format);
138 static inline int snd_mask_single(const struct snd_mask *mask)
141 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
144 if (mask->bits[i] & (mask->bits[i] - 1))
153 static inline int snd_mask_refine(struct snd_mask *mask,
154 const struct snd_mask *v)
157 snd_mask_copy(&old, mask);
158 snd_mask_intersect(mask, v);
159 if (snd_mask_empty(mask))
161 return !snd_mask_eq(mask, &old);
164 static inline int snd_mask_refine_first(struct snd_mask *mask)
166 if (snd_mask_single(mask))
168 snd_mask_leave(mask, snd_mask_min(mask));
172 static inline int snd_mask_refine_last(struct snd_mask *mask)
174 if (snd_mask_single(mask))
176 snd_mask_leave(mask, snd_mask_max(mask));
180 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
182 if (snd_mask_min(mask) >= val)
184 snd_mask_reset_range(mask, 0, val - 1);
185 if (snd_mask_empty(mask))
190 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
192 if (snd_mask_max(mask) <= val)
194 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
195 if (snd_mask_empty(mask))
200 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
203 changed = !snd_mask_single(mask);
204 snd_mask_leave(mask, val);
205 if (snd_mask_empty(mask))
210 static inline int snd_mask_value(const struct snd_mask *mask)
212 return snd_mask_min(mask);
215 static inline void snd_interval_any(struct snd_interval *i)
225 static inline void snd_interval_none(struct snd_interval *i)
230 static inline int snd_interval_checkempty(const struct snd_interval *i)
232 return (i->min > i->max ||
233 (i->min == i->max && (i->openmin || i->openmax)));
236 static inline int snd_interval_empty(const struct snd_interval *i)
241 static inline int snd_interval_single(const struct snd_interval *i)
243 return (i->min == i->max ||
244 (i->min + 1 == i->max && (i->openmin || i->openmax)));
247 static inline int snd_interval_value(const struct snd_interval *i)
249 if (i->openmin && !i->openmax)
254 static inline int snd_interval_min(const struct snd_interval *i)
259 static inline int snd_interval_max(const struct snd_interval *i)
268 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
270 return !((i->min > val || (i->min == val && i->openmin) ||
271 i->max < val || (i->max == val && i->openmax)));
274 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
279 static inline int snd_interval_setinteger(struct snd_interval *i)
283 if (i->openmin && i->openmax && i->min == i->max)
289 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
295 return i1->min == i2->min && i1->openmin == i2->openmin &&
296 i1->max == i2->max && i1->openmax == i2->openmax;
300 * params_access - get the access type from the hw params
303 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
305 return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
306 SNDRV_PCM_HW_PARAM_ACCESS));
310 * params_format - get the sample format from the hw params
313 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
315 return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
316 SNDRV_PCM_HW_PARAM_FORMAT));
320 * params_subformat - get the sample subformat from the hw params
323 static inline snd_pcm_subformat_t
324 params_subformat(const struct snd_pcm_hw_params *p)
326 return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
327 SNDRV_PCM_HW_PARAM_SUBFORMAT));
331 * params_period_bytes - get the period size (in bytes) from the hw params
334 static inline unsigned int
335 params_period_bytes(const struct snd_pcm_hw_params *p)
337 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
341 * params_width - get the number of bits of the sample format from the hw params
344 * This function returns the number of bits per sample that the selected sample
345 * format of the hw params has.
347 static inline int params_width(const struct snd_pcm_hw_params *p)
349 return snd_pcm_format_width(params_format(p));
353 * params_physical_width - get the storage size of the sample format from the hw params
356 * This functions returns the number of bits per sample that the selected sample
357 * format of the hw params takes up in memory. This will be equal or larger than
360 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
362 return snd_pcm_format_physical_width(params_format(p));
366 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
368 snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
371 #endif /* __SOUND_PCM_PARAMS_H */