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 unsigned int ld2(u_int32_t v) 42 { 43 unsigned r = 0; 44 45 if (v >= 0x10000) { 46 v >>= 16; 47 r += 16; 48 } 49 if (v >= 0x100) { 50 v >>= 8; 51 r += 8; 52 } 53 if (v >= 0x10) { 54 v >>= 4; 55 r += 4; 56 } 57 if (v >= 4) { 58 v >>= 2; 59 r += 2; 60 } 61 if (v >= 2) 62 r++; 63 return r; 64 } 65 66 static inline size_t snd_mask_sizeof(void) 67 { 68 return sizeof(struct snd_mask); 69 } 70 71 static inline void snd_mask_none(struct snd_mask *mask) 72 { 73 memset(mask, 0, sizeof(*mask)); 74 } 75 76 static inline void snd_mask_any(struct snd_mask *mask) 77 { 78 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 79 } 80 81 static inline int snd_mask_empty(const struct snd_mask *mask) 82 { 83 int i; 84 for (i = 0; i < SNDRV_MASK_SIZE; i++) 85 if (mask->bits[i]) 86 return 0; 87 return 1; 88 } 89 90 static inline unsigned int snd_mask_min(const struct snd_mask *mask) 91 { 92 int i; 93 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 94 if (mask->bits[i]) 95 return ffs(mask->bits[i]) - 1 + (i << 5); 96 } 97 return 0; 98 } 99 100 static inline unsigned int snd_mask_max(const struct snd_mask *mask) 101 { 102 int i; 103 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) { 104 if (mask->bits[i]) 105 return ld2(mask->bits[i]) + (i << 5); 106 } 107 return 0; 108 } 109 110 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val) 111 { 112 mask->bits[MASK_OFS(val)] |= MASK_BIT(val); 113 } 114 115 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val) 116 { 117 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val); 118 } 119 120 static inline void snd_mask_set_range(struct snd_mask *mask, 121 unsigned int from, unsigned int to) 122 { 123 unsigned int i; 124 for (i = from; i <= to; i++) 125 mask->bits[MASK_OFS(i)] |= MASK_BIT(i); 126 } 127 128 static inline void snd_mask_reset_range(struct snd_mask *mask, 129 unsigned int from, unsigned int to) 130 { 131 unsigned int i; 132 for (i = from; i <= to; i++) 133 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i); 134 } 135 136 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val) 137 { 138 unsigned int v; 139 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val); 140 snd_mask_none(mask); 141 mask->bits[MASK_OFS(val)] = v; 142 } 143 144 static inline void snd_mask_intersect(struct snd_mask *mask, 145 const struct snd_mask *v) 146 { 147 int i; 148 for (i = 0; i < SNDRV_MASK_SIZE; i++) 149 mask->bits[i] &= v->bits[i]; 150 } 151 152 static inline int snd_mask_eq(const struct snd_mask *mask, 153 const struct snd_mask *v) 154 { 155 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 156 } 157 158 static inline void snd_mask_copy(struct snd_mask *mask, 159 const struct snd_mask *v) 160 { 161 *mask = *v; 162 } 163 164 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val) 165 { 166 return mask->bits[MASK_OFS(val)] & MASK_BIT(val); 167 } 168 169 static inline int snd_mask_single(const struct snd_mask *mask) 170 { 171 int i, c = 0; 172 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 173 if (! mask->bits[i]) 174 continue; 175 if (mask->bits[i] & (mask->bits[i] - 1)) 176 return 0; 177 if (c) 178 return 0; 179 c++; 180 } 181 return 1; 182 } 183 184 static inline int snd_mask_refine(struct snd_mask *mask, 185 const struct snd_mask *v) 186 { 187 struct snd_mask old; 188 snd_mask_copy(&old, mask); 189 snd_mask_intersect(mask, v); 190 if (snd_mask_empty(mask)) 191 return -EINVAL; 192 return !snd_mask_eq(mask, &old); 193 } 194 195 static inline int snd_mask_refine_first(struct snd_mask *mask) 196 { 197 if (snd_mask_single(mask)) 198 return 0; 199 snd_mask_leave(mask, snd_mask_min(mask)); 200 return 1; 201 } 202 203 static inline int snd_mask_refine_last(struct snd_mask *mask) 204 { 205 if (snd_mask_single(mask)) 206 return 0; 207 snd_mask_leave(mask, snd_mask_max(mask)); 208 return 1; 209 } 210 211 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val) 212 { 213 if (snd_mask_min(mask) >= val) 214 return 0; 215 snd_mask_reset_range(mask, 0, val - 1); 216 if (snd_mask_empty(mask)) 217 return -EINVAL; 218 return 1; 219 } 220 221 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val) 222 { 223 if (snd_mask_max(mask) <= val) 224 return 0; 225 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS); 226 if (snd_mask_empty(mask)) 227 return -EINVAL; 228 return 1; 229 } 230 231 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val) 232 { 233 int changed; 234 changed = !snd_mask_single(mask); 235 snd_mask_leave(mask, val); 236 if (snd_mask_empty(mask)) 237 return -EINVAL; 238 return changed; 239 } 240 241 static inline int snd_mask_value(const struct snd_mask *mask) 242 { 243 return snd_mask_min(mask); 244 } 245 246 static inline void snd_interval_any(struct snd_interval *i) 247 { 248 i->min = 0; 249 i->openmin = 0; 250 i->max = UINT_MAX; 251 i->openmax = 0; 252 i->integer = 0; 253 i->empty = 0; 254 } 255 256 static inline void snd_interval_none(struct snd_interval *i) 257 { 258 i->empty = 1; 259 } 260 261 static inline int snd_interval_checkempty(const struct snd_interval *i) 262 { 263 return (i->min > i->max || 264 (i->min == i->max && (i->openmin || i->openmax))); 265 } 266 267 static inline int snd_interval_empty(const struct snd_interval *i) 268 { 269 return i->empty; 270 } 271 272 static inline int snd_interval_single(const struct snd_interval *i) 273 { 274 return (i->min == i->max || 275 (i->min + 1 == i->max && i->openmax)); 276 } 277 278 static inline int snd_interval_value(const struct snd_interval *i) 279 { 280 return i->min; 281 } 282 283 static inline int snd_interval_min(const struct snd_interval *i) 284 { 285 return i->min; 286 } 287 288 static inline int snd_interval_max(const struct snd_interval *i) 289 { 290 unsigned int v; 291 v = i->max; 292 if (i->openmax) 293 v--; 294 return v; 295 } 296 297 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val) 298 { 299 return !((i->min > val || (i->min == val && i->openmin) || 300 i->max < val || (i->max == val && i->openmax))); 301 } 302 303 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) 304 { 305 *d = *s; 306 } 307 308 static inline int snd_interval_setinteger(struct snd_interval *i) 309 { 310 if (i->integer) 311 return 0; 312 if (i->openmin && i->openmax && i->min == i->max) 313 return -EINVAL; 314 i->integer = 1; 315 return 1; 316 } 317 318 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2) 319 { 320 if (i1->empty) 321 return i2->empty; 322 if (i2->empty) 323 return i1->empty; 324 return i1->min == i2->min && i1->openmin == i2->openmin && 325 i1->max == i2->max && i1->openmax == i2->openmax; 326 } 327 328 static inline unsigned int add(unsigned int a, unsigned int b) 329 { 330 if (a >= UINT_MAX - b) 331 return UINT_MAX; 332 return a + b; 333 } 334 335 static inline unsigned int sub(unsigned int a, unsigned int b) 336 { 337 if (a > b) 338 return a - b; 339 return 0; 340 } 341 342 #define params_access(p) ((__force snd_pcm_access_t)\ 343 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_ACCESS))) 344 #define params_format(p) ((__force snd_pcm_format_t)\ 345 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_FORMAT))) 346 #define params_subformat(p) \ 347 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 348 349 static inline unsigned int 350 params_period_bytes(const struct snd_pcm_hw_params *p) 351 { 352 return (params_period_size(p) * 353 snd_pcm_format_physical_width(params_format(p)) * 354 params_channels(p)) / 8; 355 } 356 357 #endif /* __SOUND_PCM_PARAMS_H */ 358