1 #ifndef __SOUND_PCM_PARAMS_H 2 #define __SOUND_PCM_PARAMS_H 3 4 /* 5 * PCM params helpers 6 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org> 7 * 8 * 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. 13 * 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. 18 * 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 22 * 23 */ 24 25 #include <sound/pcm.h> 26 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); 35 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)) 40 41 static inline size_t snd_mask_sizeof(void) 42 { 43 return sizeof(struct snd_mask); 44 } 45 46 static inline void snd_mask_none(struct snd_mask *mask) 47 { 48 memset(mask, 0, sizeof(*mask)); 49 } 50 51 static inline void snd_mask_any(struct snd_mask *mask) 52 { 53 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 54 } 55 56 static inline int snd_mask_empty(const struct snd_mask *mask) 57 { 58 int i; 59 for (i = 0; i < SNDRV_MASK_SIZE; i++) 60 if (mask->bits[i]) 61 return 0; 62 return 1; 63 } 64 65 static inline unsigned int snd_mask_min(const struct snd_mask *mask) 66 { 67 int i; 68 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 69 if (mask->bits[i]) 70 return __ffs(mask->bits[i]) + (i << 5); 71 } 72 return 0; 73 } 74 75 static inline unsigned int snd_mask_max(const struct snd_mask *mask) 76 { 77 int i; 78 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) { 79 if (mask->bits[i]) 80 return __fls(mask->bits[i]) + (i << 5); 81 } 82 return 0; 83 } 84 85 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val) 86 { 87 mask->bits[MASK_OFS(val)] |= MASK_BIT(val); 88 } 89 90 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val) 91 { 92 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val); 93 } 94 95 static inline void snd_mask_set_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_reset_range(struct snd_mask *mask, 104 unsigned int from, unsigned int to) 105 { 106 unsigned int i; 107 for (i = from; i <= to; i++) 108 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i); 109 } 110 111 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val) 112 { 113 unsigned int v; 114 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val); 115 snd_mask_none(mask); 116 mask->bits[MASK_OFS(val)] = v; 117 } 118 119 static inline void snd_mask_intersect(struct snd_mask *mask, 120 const struct snd_mask *v) 121 { 122 int i; 123 for (i = 0; i < SNDRV_MASK_SIZE; i++) 124 mask->bits[i] &= v->bits[i]; 125 } 126 127 static inline int snd_mask_eq(const struct snd_mask *mask, 128 const struct snd_mask *v) 129 { 130 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 131 } 132 133 static inline void snd_mask_copy(struct snd_mask *mask, 134 const struct snd_mask *v) 135 { 136 *mask = *v; 137 } 138 139 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val) 140 { 141 return mask->bits[MASK_OFS(val)] & MASK_BIT(val); 142 } 143 144 static inline int snd_mask_single(const struct snd_mask *mask) 145 { 146 int i, c = 0; 147 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 148 if (! mask->bits[i]) 149 continue; 150 if (mask->bits[i] & (mask->bits[i] - 1)) 151 return 0; 152 if (c) 153 return 0; 154 c++; 155 } 156 return 1; 157 } 158 159 static inline int snd_mask_refine(struct snd_mask *mask, 160 const struct snd_mask *v) 161 { 162 struct snd_mask old; 163 snd_mask_copy(&old, mask); 164 snd_mask_intersect(mask, v); 165 if (snd_mask_empty(mask)) 166 return -EINVAL; 167 return !snd_mask_eq(mask, &old); 168 } 169 170 static inline int snd_mask_refine_first(struct snd_mask *mask) 171 { 172 if (snd_mask_single(mask)) 173 return 0; 174 snd_mask_leave(mask, snd_mask_min(mask)); 175 return 1; 176 } 177 178 static inline int snd_mask_refine_last(struct snd_mask *mask) 179 { 180 if (snd_mask_single(mask)) 181 return 0; 182 snd_mask_leave(mask, snd_mask_max(mask)); 183 return 1; 184 } 185 186 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val) 187 { 188 if (snd_mask_min(mask) >= val) 189 return 0; 190 snd_mask_reset_range(mask, 0, val - 1); 191 if (snd_mask_empty(mask)) 192 return -EINVAL; 193 return 1; 194 } 195 196 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val) 197 { 198 if (snd_mask_max(mask) <= val) 199 return 0; 200 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS); 201 if (snd_mask_empty(mask)) 202 return -EINVAL; 203 return 1; 204 } 205 206 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val) 207 { 208 int changed; 209 changed = !snd_mask_single(mask); 210 snd_mask_leave(mask, val); 211 if (snd_mask_empty(mask)) 212 return -EINVAL; 213 return changed; 214 } 215 216 static inline int snd_mask_value(const struct snd_mask *mask) 217 { 218 return snd_mask_min(mask); 219 } 220 221 static inline void snd_interval_any(struct snd_interval *i) 222 { 223 i->min = 0; 224 i->openmin = 0; 225 i->max = UINT_MAX; 226 i->openmax = 0; 227 i->integer = 0; 228 i->empty = 0; 229 } 230 231 static inline void snd_interval_none(struct snd_interval *i) 232 { 233 i->empty = 1; 234 } 235 236 static inline int snd_interval_checkempty(const struct snd_interval *i) 237 { 238 return (i->min > i->max || 239 (i->min == i->max && (i->openmin || i->openmax))); 240 } 241 242 static inline int snd_interval_empty(const struct snd_interval *i) 243 { 244 return i->empty; 245 } 246 247 static inline int snd_interval_single(const struct snd_interval *i) 248 { 249 return (i->min == i->max || 250 (i->min + 1 == i->max && i->openmax)); 251 } 252 253 static inline int snd_interval_value(const struct snd_interval *i) 254 { 255 return i->min; 256 } 257 258 static inline int snd_interval_min(const struct snd_interval *i) 259 { 260 return i->min; 261 } 262 263 static inline int snd_interval_max(const struct snd_interval *i) 264 { 265 unsigned int v; 266 v = i->max; 267 if (i->openmax) 268 v--; 269 return v; 270 } 271 272 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val) 273 { 274 return !((i->min > val || (i->min == val && i->openmin) || 275 i->max < val || (i->max == val && i->openmax))); 276 } 277 278 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) 279 { 280 *d = *s; 281 } 282 283 static inline int snd_interval_setinteger(struct snd_interval *i) 284 { 285 if (i->integer) 286 return 0; 287 if (i->openmin && i->openmax && i->min == i->max) 288 return -EINVAL; 289 i->integer = 1; 290 return 1; 291 } 292 293 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2) 294 { 295 if (i1->empty) 296 return i2->empty; 297 if (i2->empty) 298 return i1->empty; 299 return i1->min == i2->min && i1->openmin == i2->openmin && 300 i1->max == i2->max && i1->openmax == i2->openmax; 301 } 302 303 /** 304 * params_access - get the access type from the hw params 305 * @p: hw params 306 */ 307 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p) 308 { 309 return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p, 310 SNDRV_PCM_HW_PARAM_ACCESS)); 311 } 312 313 /** 314 * params_format - get the sample format from the hw params 315 * @p: hw params 316 */ 317 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p) 318 { 319 return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p, 320 SNDRV_PCM_HW_PARAM_FORMAT)); 321 } 322 323 /** 324 * params_subformat - get the sample subformat from the hw params 325 * @p: hw params 326 */ 327 static inline snd_pcm_subformat_t 328 params_subformat(const struct snd_pcm_hw_params *p) 329 { 330 return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p, 331 SNDRV_PCM_HW_PARAM_SUBFORMAT)); 332 } 333 334 /** 335 * params_period_bytes - get the period size (in bytes) from the hw params 336 * @p: hw params 337 */ 338 static inline unsigned int 339 params_period_bytes(const struct snd_pcm_hw_params *p) 340 { 341 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min; 342 } 343 344 /** 345 * params_width - get the number of bits of the sample format from the hw params 346 * @p: hw params 347 * 348 * This function returns the number of bits per sample that the selected sample 349 * format of the hw params has. 350 */ 351 static inline int params_width(const struct snd_pcm_hw_params *p) 352 { 353 return snd_pcm_format_width(params_format(p)); 354 } 355 356 /* 357 * params_physical_width - get the storage size of the sample format from the hw params 358 * @p: hw params 359 * 360 * This functions returns the number of bits per sample that the selected sample 361 * format of the hw params takes up in memory. This will be equal or larger than 362 * params_width(). 363 */ 364 static inline int params_physical_width(const struct snd_pcm_hw_params *p) 365 { 366 return snd_pcm_format_physical_width(params_format(p)); 367 } 368 369 static inline void 370 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt) 371 { 372 snd_mask_set(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), 373 (__force int)fmt); 374 } 375 376 #endif /* __SOUND_PCM_PARAMS_H */ 377