include/sound/pcm_params.h

   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 void snd_mask_none(struct snd_mask *mask)
  27 {
  28         memset(mask, 0, sizeof(*mask));
  29 }
  30
  31 static inline void snd_mask_any(struct snd_mask *mask)
  32 {
  33         memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
  34 }
  35
  36 static inline int snd_mask_empty(const struct snd_mask *mask)
  37 {
  38         int i;
  39         for (i = 0; i < SNDRV_MASK_SIZE; i++)
  40                 if (mask->bits[i])
  41                         return 0;
  42         return 1;
  43 }
  44
  45 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
  46 {
  47         int i;
  48         for (i = 0; i < SNDRV_MASK_SIZE; i++) {
  49                 if (mask->bits[i])
  50                         return __ffs(mask->bits[i]) + (i << 5);
  51         }
  52         return 0;
  53 }
  54
  55 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
  56 {
  57         int i;
  58         for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
  59                 if (mask->bits[i])
  60                         return __fls(mask->bits[i]) + (i << 5);
  61         }
  62         return 0;
  63 }
  64
  65 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
  66 {
  67         mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
  68 }
  69
  70 /* Most of drivers need only this one */
  71 static inline void snd_mask_set_format(struct snd_mask *mask,
  72                                        snd_pcm_format_t format)
  73 {
  74         snd_mask_set(mask, (__force unsigned int)format);
  75 }
  76
  77 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
  78 {
  79         mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
  80 }
  81
  82 static inline void snd_mask_set_range(struct snd_mask *mask,
  83                                       unsigned int from, unsigned int to)
  84 {
  85         unsigned int i;
  86         for (i = from; i <= to; i++)
  87                 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
  88 }
  89
  90 static inline void snd_mask_reset_range(struct snd_mask *mask,
  91                                         unsigned int from, unsigned int to)
  92 {
  93         unsigned int i;
  94         for (i = from; i <= to; i++)
  95                 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
  96 }
  97
  98 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
  99 {
 100         unsigned int v;
 101         v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
 102         snd_mask_none(mask);
 103         mask->bits[MASK_OFS(val)] = v;
 104 }
 105
 106 static inline void snd_mask_intersect(struct snd_mask *mask,
 107                                       const struct snd_mask *v)
 108 {
 109         int i;
 110         for (i = 0; i < SNDRV_MASK_SIZE; i++)
 111                 mask->bits[i] &= v->bits[i];
 112 }
 113
 114 static inline int snd_mask_eq(const struct snd_mask *mask,
 115                               const struct snd_mask *v)
 116 {
 117         return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
 118 }
 119
 120 static inline void snd_mask_copy(struct snd_mask *mask,
 121                                  const struct snd_mask *v)
 122 {
 123         *mask = *v;
 124 }
 125
 126 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
 127 {
 128         return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
 129 }
 130
 131 /* Most of drivers need only this one */
 132 static inline int snd_mask_test_format(const struct snd_mask *mask,
 133                                        snd_pcm_format_t format)
 134 {
 135         return snd_mask_test(mask, (__force unsigned int)format);
 136 }
 137
 138 static inline int snd_mask_single(const struct snd_mask *mask)
 139 {
 140         int i, c = 0;
 141         for (i = 0; i < SNDRV_MASK_SIZE; i++) {
 142                 if (! mask->bits[i])
 143                         continue;
 144                 if (mask->bits[i] & (mask->bits[i] - 1))
 145                         return 0;
 146                 if (c)
 147                         return 0;
 148                 c++;
 149         }
 150         return 1;
 151 }
 152
 153 static inline int snd_mask_refine(struct snd_mask *mask,
 154                                   const struct snd_mask *v)
 155 {
 156         struct snd_mask old;
 157         snd_mask_copy(&old, mask);
 158         snd_mask_intersect(mask, v);
 159         if (snd_mask_empty(mask))
 160                 return -EINVAL;
 161         return !snd_mask_eq(mask, &old);
 162 }
 163
 164 static inline int snd_mask_refine_first(struct snd_mask *mask)
 165 {
 166         if (snd_mask_single(mask))
 167                 return 0;
 168         snd_mask_leave(mask, snd_mask_min(mask));
 169         return 1;
 170 }
 171
 172 static inline int snd_mask_refine_last(struct snd_mask *mask)
 173 {
 174         if (snd_mask_single(mask))
 175                 return 0;
 176         snd_mask_leave(mask, snd_mask_max(mask));
 177         return 1;
 178 }
 179
 180 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
 181 {
 182         if (snd_mask_min(mask) >= val)
 183                 return 0;
 184         snd_mask_reset_range(mask, 0, val - 1);
 185         if (snd_mask_empty(mask))
 186                 return -EINVAL;
 187         return 1;
 188 }
 189
 190 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
 191 {
 192         if (snd_mask_max(mask) <= val)
 193                 return 0;
 194         snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
 195         if (snd_mask_empty(mask))
 196                 return -EINVAL;
 197         return 1;
 198 }
 199
 200 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
 201 {
 202         int changed;
 203         changed = !snd_mask_single(mask);
 204         snd_mask_leave(mask, val);
 205         if (snd_mask_empty(mask))
 206                 return -EINVAL;
 207         return changed;
 208 }
 209
 210 static inline int snd_mask_value(const struct snd_mask *mask)
 211 {
 212         return snd_mask_min(mask);
 213 }
 214
 215 static inline void snd_interval_any(struct snd_interval *i)
 216 {
 217         i->min = 0;
 218         i->openmin = 0;
 219         i->max = UINT_MAX;
 220         i->openmax = 0;
 221         i->integer = 0;
 222         i->empty = 0;
 223 }
 224
 225 static inline void snd_interval_none(struct snd_interval *i)
 226 {
 227         i->empty = 1;
 228 }
 229
 230 static inline int snd_interval_checkempty(const struct snd_interval *i)
 231 {
 232         return (i->min > i->max ||
 233                 (i->min == i->max && (i->openmin || i->openmax)));
 234 }
 235
 236 static inline int snd_interval_empty(const struct snd_interval *i)
 237 {
 238         return i->empty;
 239 }
 240
 241 static inline int snd_interval_single(const struct snd_interval *i)
 242 {
 243         return (i->min == i->max ||
 244                 (i->min + 1 == i->max && (i->openmin || i->openmax)));
 245 }
 246
 247 static inline int snd_interval_value(const struct snd_interval *i)
 248 {
 249         if (i->openmin && !i->openmax)
 250                 return i->max;
 251         return i->min;
 252 }
 253
 254 static inline int snd_interval_min(const struct snd_interval *i)
 255 {
 256         return i->min;
 257 }
 258
 259 static inline int snd_interval_max(const struct snd_interval *i)
 260 {
 261         unsigned int v;
 262         v = i->max;
 263         if (i->openmax)
 264                 v--;
 265         return v;
 266 }
 267
 268 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
 269 {
 270         return !((i->min > val || (i->min == val && i->openmin) ||
 271                   i->max < val || (i->max == val && i->openmax)));
 272 }
 273
 274 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
 275 {
 276         *d = *s;
 277 }
 278
 279 static inline int snd_interval_setinteger(struct snd_interval *i)
 280 {
 281         if (i->integer)
 282                 return 0;
 283         if (i->openmin && i->openmax && i->min == i->max)
 284                 return -EINVAL;
 285         i->integer = 1;
 286         return 1;
 287 }
 288
 289 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
 290 {
 291         if (i1->empty)
 292                 return i2->empty;
 293         if (i2->empty)
 294                 return i1->empty;
 295         return i1->min == i2->min && i1->openmin == i2->openmin &&
 296                 i1->max == i2->max && i1->openmax == i2->openmax;
 297 }
 298
 299 /**
 300  * params_access - get the access type from the hw params
 301  * @p: hw params
 302  */
 303 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
 304 {
 305         return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
 306                 SNDRV_PCM_HW_PARAM_ACCESS));
 307 }
 308
 309 /**
 310  * params_format - get the sample format from the hw params
 311  * @p: hw params
 312  */
 313 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
 314 {
 315         return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
 316                 SNDRV_PCM_HW_PARAM_FORMAT));
 317 }
 318
 319 /**
 320  * params_subformat - get the sample subformat from the hw params
 321  * @p: hw params
 322  */
 323 static inline snd_pcm_subformat_t
 324 params_subformat(const struct snd_pcm_hw_params *p)
 325 {
 326         return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
 327                 SNDRV_PCM_HW_PARAM_SUBFORMAT));
 328 }
 329
 330 /**
 331  * params_period_bytes - get the period size (in bytes) from the hw params
 332  * @p: hw params
 333  */
 334 static inline unsigned int
 335 params_period_bytes(const struct snd_pcm_hw_params *p)
 336 {
 337         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
 338 }
 339
 340 /**
 341  * params_width - get the number of bits of the sample format from the hw params
 342  * @p: hw params
 343  *
 344  * This function returns the number of bits per sample that the selected sample
 345  * format of the hw params has.
 346  */
 347 static inline int params_width(const struct snd_pcm_hw_params *p)
 348 {
 349         return snd_pcm_format_width(params_format(p));
 350 }
 351
 352 /*
 353  * params_physical_width - get the storage size of the sample format from the hw params
 354  * @p: hw params
 355  *
 356  * This functions returns the number of bits per sample that the selected sample
 357  * format of the hw params takes up in memory. This will be equal or larger than
 358  * params_width().
 359  */
 360 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
 361 {
 362         return snd_pcm_format_physical_width(params_format(p));
 363 }
 364
 365 int snd_pcm_hw_params_bits(const struct snd_pcm_hw_params *p);
 366
 367 static inline void
 368 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
 369 {
 370         snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
 371 }
 372
 373 #endif /* __SOUND_PCM_PARAMS_H */