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