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 27int 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); 30int 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); 33int 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 41static inline size_t snd_mask_sizeof(void) 42{ 43 return sizeof(struct snd_mask); 44} 45 46static inline void snd_mask_none(struct snd_mask *mask) 47{ 48 memset(mask, 0, sizeof(*mask)); 49} 50 51static inline void snd_mask_any(struct snd_mask *mask) 52{ 53 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 54} 55 56static 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 65static 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 75static 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 85static inline void snd_mask_set(struct snd_mask *mask, unsigned int val) 86{ 87 mask->bits[MASK_OFS(val)] |= MASK_BIT(val); 88} 89 90static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val) 91{ 92 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val); 93} 94 95static 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 103static 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 111static 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 119static 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 127static 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 133static inline void snd_mask_copy(struct snd_mask *mask, 134 const struct snd_mask *v) 135{ 136 *mask = *v; 137} 138 139static 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 144static 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 159static 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 170static 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 178static 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 186static 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 196static 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 206static 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 216static inline int snd_mask_value(const struct snd_mask *mask) 217{ 218 return snd_mask_min(mask); 219} 220 221static 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 231static inline void snd_interval_none(struct snd_interval *i) 232{ 233 i->empty = 1; 234} 235 236static 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 242static inline int snd_interval_empty(const struct snd_interval *i) 243{ 244 return i->empty; 245} 246 247static 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 253static inline int snd_interval_value(const struct snd_interval *i) 254{ 255 return i->min; 256} 257 258static inline int snd_interval_min(const struct snd_interval *i) 259{ 260 return i->min; 261} 262 263static 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 272static 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 278static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) 279{ 280 *d = *s; 281} 282 283static 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 293static 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 */ 307static 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 */ 317static 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 */ 327static inline snd_pcm_subformat_t 328params_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 */ 338static inline unsigned int 339params_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 */ 351static 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 */ 364static 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 369static inline void 370params_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