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Linux/include/sound/pcm_params.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 #ifndef __SOUND_PCM_PARAMS_H
  3 #define __SOUND_PCM_PARAMS_H
  4 
  5 /*
  6  *  PCM params helpers
  7  *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
  8  */
  9 
 10 #include <sound/pcm.h>
 11 
 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);
 20 
 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))
 25 
 26 static inline size_t snd_mask_sizeof(void)
 27 {
 28         return sizeof(struct snd_mask);
 29 }
 30 
 31 static inline void snd_mask_none(struct snd_mask *mask)
 32 {
 33         memset(mask, 0, sizeof(*mask));
 34 }
 35 
 36 static inline void snd_mask_any(struct snd_mask *mask)
 37 {
 38         memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
 39 }
 40 
 41 static inline int snd_mask_empty(const struct snd_mask *mask)
 42 {
 43         int i;
 44         for (i = 0; i < SNDRV_MASK_SIZE; i++)
 45                 if (mask->bits[i])
 46                         return 0;
 47         return 1;
 48 }
 49 
 50 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
 51 {
 52         int i;
 53         for (i = 0; i < SNDRV_MASK_SIZE; i++) {
 54                 if (mask->bits[i])
 55                         return __ffs(mask->bits[i]) + (i << 5);
 56         }
 57         return 0;
 58 }
 59 
 60 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
 61 {
 62         int i;
 63         for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
 64                 if (mask->bits[i])
 65                         return __fls(mask->bits[i]) + (i << 5);
 66         }
 67         return 0;
 68 }
 69 
 70 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
 71 {
 72         mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
 73 }
 74 
 75 /* Most of drivers need only this one */
 76 static inline void snd_mask_set_format(struct snd_mask *mask,
 77                                        snd_pcm_format_t format)
 78 {
 79         snd_mask_set(mask, (__force unsigned int)format);
 80 }
 81 
 82 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
 83 {
 84         mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
 85 }
 86 
 87 static inline void snd_mask_set_range(struct snd_mask *mask,
 88                                       unsigned int from, unsigned int to)
 89 {
 90         unsigned int i;
 91         for (i = from; i <= to; i++)
 92                 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
 93 }
 94 
 95 static inline void snd_mask_reset_range(struct snd_mask *mask,
 96                                         unsigned int from, unsigned int to)
 97 {
 98         unsigned int i;
 99         for (i = from; i <= to; i++)
100                 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
101 }
102 
103 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
104 {
105         unsigned int v;
106         v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
107         snd_mask_none(mask);
108         mask->bits[MASK_OFS(val)] = v;
109 }
110 
111 static inline void snd_mask_intersect(struct snd_mask *mask,
112                                       const struct snd_mask *v)
113 {
114         int i;
115         for (i = 0; i < SNDRV_MASK_SIZE; i++)
116                 mask->bits[i] &= v->bits[i];
117 }
118 
119 static inline int snd_mask_eq(const struct snd_mask *mask,
120                               const struct snd_mask *v)
121 {
122         return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
123 }
124 
125 static inline void snd_mask_copy(struct snd_mask *mask,
126                                  const struct snd_mask *v)
127 {
128         *mask = *v;
129 }
130 
131 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
132 {
133         return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
134 }
135 
136 static inline int snd_mask_single(const struct snd_mask *mask)
137 {
138         int i, c = 0;
139         for (i = 0; i < SNDRV_MASK_SIZE; i++) {
140                 if (! mask->bits[i])
141                         continue;
142                 if (mask->bits[i] & (mask->bits[i] - 1))
143                         return 0;
144                 if (c)
145                         return 0;
146                 c++;
147         }
148         return 1;
149 }
150 
151 static inline int snd_mask_refine(struct snd_mask *mask,
152                                   const struct snd_mask *v)
153 {
154         struct snd_mask old;
155         snd_mask_copy(&old, mask);
156         snd_mask_intersect(mask, v);
157         if (snd_mask_empty(mask))
158                 return -EINVAL;
159         return !snd_mask_eq(mask, &old);
160 }
161 
162 static inline int snd_mask_refine_first(struct snd_mask *mask)
163 {
164         if (snd_mask_single(mask))
165                 return 0;
166         snd_mask_leave(mask, snd_mask_min(mask));
167         return 1;
168 }
169 
170 static inline int snd_mask_refine_last(struct snd_mask *mask)
171 {
172         if (snd_mask_single(mask))
173                 return 0;
174         snd_mask_leave(mask, snd_mask_max(mask));
175         return 1;
176 }
177 
178 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
179 {
180         if (snd_mask_min(mask) >= val)
181                 return 0;
182         snd_mask_reset_range(mask, 0, val - 1);
183         if (snd_mask_empty(mask))
184                 return -EINVAL;
185         return 1;
186 }
187 
188 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
189 {
190         if (snd_mask_max(mask) <= val)
191                 return 0;
192         snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
193         if (snd_mask_empty(mask))
194                 return -EINVAL;
195         return 1;
196 }
197 
198 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
199 {
200         int changed;
201         changed = !snd_mask_single(mask);
202         snd_mask_leave(mask, val);
203         if (snd_mask_empty(mask))
204                 return -EINVAL;
205         return changed;
206 }
207 
208 static inline int snd_mask_value(const struct snd_mask *mask)
209 {
210         return snd_mask_min(mask);
211 }
212 
213 static inline void snd_interval_any(struct snd_interval *i)
214 {
215         i->min = 0;
216         i->openmin = 0;
217         i->max = UINT_MAX;
218         i->openmax = 0;
219         i->integer = 0;
220         i->empty = 0;
221 }
222 
223 static inline void snd_interval_none(struct snd_interval *i)
224 {
225         i->empty = 1;
226 }
227 
228 static inline int snd_interval_checkempty(const struct snd_interval *i)
229 {
230         return (i->min > i->max ||
231                 (i->min == i->max && (i->openmin || i->openmax)));
232 }
233 
234 static inline int snd_interval_empty(const struct snd_interval *i)
235 {
236         return i->empty;
237 }
238 
239 static inline int snd_interval_single(const struct snd_interval *i)
240 {
241         return (i->min == i->max || 
242                 (i->min + 1 == i->max && (i->openmin || i->openmax)));
243 }
244 
245 static inline int snd_interval_value(const struct snd_interval *i)
246 {
247         if (i->openmin && !i->openmax)
248                 return i->max;
249         return i->min;
250 }
251 
252 static inline int snd_interval_min(const struct snd_interval *i)
253 {
254         return i->min;
255 }
256 
257 static inline int snd_interval_max(const struct snd_interval *i)
258 {
259         unsigned int v;
260         v = i->max;
261         if (i->openmax)
262                 v--;
263         return v;
264 }
265 
266 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
267 {
268         return !((i->min > val || (i->min == val && i->openmin) ||
269                   i->max < val || (i->max == val && i->openmax)));
270 }
271 
272 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
273 {
274         *d = *s;
275 }
276 
277 static inline int snd_interval_setinteger(struct snd_interval *i)
278 {
279         if (i->integer)
280                 return 0;
281         if (i->openmin && i->openmax && i->min == i->max)
282                 return -EINVAL;
283         i->integer = 1;
284         return 1;
285 }
286 
287 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
288 {
289         if (i1->empty)
290                 return i2->empty;
291         if (i2->empty)
292                 return i1->empty;
293         return i1->min == i2->min && i1->openmin == i2->openmin &&
294                 i1->max == i2->max && i1->openmax == i2->openmax;
295 }
296 
297 /**
298  * params_access - get the access type from the hw params
299  * @p: hw params
300  */
301 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
302 {
303         return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
304                 SNDRV_PCM_HW_PARAM_ACCESS));
305 }
306 
307 /**
308  * params_format - get the sample format from the hw params
309  * @p: hw params
310  */
311 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
312 {
313         return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
314                 SNDRV_PCM_HW_PARAM_FORMAT));
315 }
316 
317 /**
318  * params_subformat - get the sample subformat from the hw params
319  * @p: hw params
320  */
321 static inline snd_pcm_subformat_t
322 params_subformat(const struct snd_pcm_hw_params *p)
323 {
324         return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
325                 SNDRV_PCM_HW_PARAM_SUBFORMAT));
326 }
327 
328 /**
329  * params_period_bytes - get the period size (in bytes) from the hw params
330  * @p: hw params
331  */
332 static inline unsigned int
333 params_period_bytes(const struct snd_pcm_hw_params *p)
334 {
335         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
336 }
337 
338 /**
339  * params_width - get the number of bits of the sample format from the hw params
340  * @p: hw params
341  *
342  * This function returns the number of bits per sample that the selected sample
343  * format of the hw params has.
344  */
345 static inline int params_width(const struct snd_pcm_hw_params *p)
346 {
347         return snd_pcm_format_width(params_format(p));
348 }
349 
350 /*
351  * params_physical_width - get the storage size of the sample format from the hw params
352  * @p: hw params
353  *
354  * This functions returns the number of bits per sample that the selected sample
355  * format of the hw params takes up in memory. This will be equal or larger than
356  * params_width().
357  */
358 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
359 {
360         return snd_pcm_format_physical_width(params_format(p));
361 }
362 
363 static inline void
364 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
365 {
366         snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
367 }
368 
369 #endif /* __SOUND_PCM_PARAMS_H */
370 

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