include/sound/pcm_params.h

   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 /* Most of drivers need only this one */
  91 static inline void snd_mask_set_format(struct snd_mask *mask,
  92                                        snd_pcm_format_t format)
  93 {
  94         snd_mask_set(mask, (__force unsigned int)format);
  95 }
  96
  97 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
  98 {
  99         mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
 100 }
 101
 102 static inline void snd_mask_set_range(struct snd_mask *mask,
 103                                       unsigned int from, unsigned int to)
 104 {
 105         unsigned int i;
 106         for (i = from; i <= to; i++)
 107                 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
 108 }
 109
 110 static inline void snd_mask_reset_range(struct snd_mask *mask,
 111                                         unsigned int from, unsigned int to)
 112 {
 113         unsigned int i;
 114         for (i = from; i <= to; i++)
 115                 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
 116 }
 117
 118 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
 119 {
 120         unsigned int v;
 121         v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
 122         snd_mask_none(mask);
 123         mask->bits[MASK_OFS(val)] = v;
 124 }
 125
 126 static inline void snd_mask_intersect(struct snd_mask *mask,
 127                                       const struct snd_mask *v)
 128 {
 129         int i;
 130         for (i = 0; i < SNDRV_MASK_SIZE; i++)
 131                 mask->bits[i] &= v->bits[i];
 132 }
 133
 134 static inline int snd_mask_eq(const struct snd_mask *mask,
 135                               const struct snd_mask *v)
 136 {
 137         return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
 138 }
 139
 140 static inline void snd_mask_copy(struct snd_mask *mask,
 141                                  const struct snd_mask *v)
 142 {
 143         *mask = *v;
 144 }
 145
 146 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
 147 {
 148         return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
 149 }
 150
 151 static inline int snd_mask_single(const struct snd_mask *mask)
 152 {
 153         int i, c = 0;
 154         for (i = 0; i < SNDRV_MASK_SIZE; i++) {
 155                 if (! mask->bits[i])
 156                         continue;
 157                 if (mask->bits[i] & (mask->bits[i] - 1))
 158                         return 0;
 159                 if (c)
 160                         return 0;
 161                 c++;
 162         }
 163         return 1;
 164 }
 165
 166 static inline int snd_mask_refine(struct snd_mask *mask,
 167                                   const struct snd_mask *v)
 168 {
 169         struct snd_mask old;
 170         snd_mask_copy(&old, mask);
 171         snd_mask_intersect(mask, v);
 172         if (snd_mask_empty(mask))
 173                 return -EINVAL;
 174         return !snd_mask_eq(mask, &old);
 175 }
 176
 177 static inline int snd_mask_refine_first(struct snd_mask *mask)
 178 {
 179         if (snd_mask_single(mask))
 180                 return 0;
 181         snd_mask_leave(mask, snd_mask_min(mask));
 182         return 1;
 183 }
 184
 185 static inline int snd_mask_refine_last(struct snd_mask *mask)
 186 {
 187         if (snd_mask_single(mask))
 188                 return 0;
 189         snd_mask_leave(mask, snd_mask_max(mask));
 190         return 1;
 191 }
 192
 193 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
 194 {
 195         if (snd_mask_min(mask) >= val)
 196                 return 0;
 197         snd_mask_reset_range(mask, 0, val - 1);
 198         if (snd_mask_empty(mask))
 199                 return -EINVAL;
 200         return 1;
 201 }
 202
 203 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
 204 {
 205         if (snd_mask_max(mask) <= val)
 206                 return 0;
 207         snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
 208         if (snd_mask_empty(mask))
 209                 return -EINVAL;
 210         return 1;
 211 }
 212
 213 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
 214 {
 215         int changed;
 216         changed = !snd_mask_single(mask);
 217         snd_mask_leave(mask, val);
 218         if (snd_mask_empty(mask))
 219                 return -EINVAL;
 220         return changed;
 221 }
 222
 223 static inline int snd_mask_value(const struct snd_mask *mask)
 224 {
 225         return snd_mask_min(mask);
 226 }
 227
 228 static inline void snd_interval_any(struct snd_interval *i)
 229 {
 230         i->min = 0;
 231         i->openmin = 0;
 232         i->max = UINT_MAX;
 233         i->openmax = 0;
 234         i->integer = 0;
 235         i->empty = 0;
 236 }
 237
 238 static inline void snd_interval_none(struct snd_interval *i)
 239 {
 240         i->empty = 1;
 241 }
 242
 243 static inline int snd_interval_checkempty(const struct snd_interval *i)
 244 {
 245         return (i->min > i->max ||
 246                 (i->min == i->max && (i->openmin || i->openmax)));
 247 }
 248
 249 static inline int snd_interval_empty(const struct snd_interval *i)
 250 {
 251         return i->empty;
 252 }
 253
 254 static inline int snd_interval_single(const struct snd_interval *i)
 255 {
 256         return (i->min == i->max ||
 257                 (i->min + 1 == i->max && (i->openmin || i->openmax)));
 258 }
 259
 260 static inline int snd_interval_value(const struct snd_interval *i)
 261 {
 262         if (i->openmin && !i->openmax)
 263                 return i->max;
 264         return i->min;
 265 }
 266
 267 static inline int snd_interval_min(const struct snd_interval *i)
 268 {
 269         return i->min;
 270 }
 271
 272 static inline int snd_interval_max(const struct snd_interval *i)
 273 {
 274         unsigned int v;
 275         v = i->max;
 276         if (i->openmax)
 277                 v--;
 278         return v;
 279 }
 280
 281 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
 282 {
 283         return !((i->min > val || (i->min == val && i->openmin) ||
 284                   i->max < val || (i->max == val && i->openmax)));
 285 }
 286
 287 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
 288 {
 289         *d = *s;
 290 }
 291
 292 static inline int snd_interval_setinteger(struct snd_interval *i)
 293 {
 294         if (i->integer)
 295                 return 0;
 296         if (i->openmin && i->openmax && i->min == i->max)
 297                 return -EINVAL;
 298         i->integer = 1;
 299         return 1;
 300 }
 301
 302 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
 303 {
 304         if (i1->empty)
 305                 return i2->empty;
 306         if (i2->empty)
 307                 return i1->empty;
 308         return i1->min == i2->min && i1->openmin == i2->openmin &&
 309                 i1->max == i2->max && i1->openmax == i2->openmax;
 310 }
 311
 312 /**
 313  * params_access - get the access type from the hw params
 314  * @p: hw params
 315  */
 316 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
 317 {
 318         return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
 319                 SNDRV_PCM_HW_PARAM_ACCESS));
 320 }
 321
 322 /**
 323  * params_format - get the sample format from the hw params
 324  * @p: hw params
 325  */
 326 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
 327 {
 328         return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
 329                 SNDRV_PCM_HW_PARAM_FORMAT));
 330 }
 331
 332 /**
 333  * params_subformat - get the sample subformat from the hw params
 334  * @p: hw params
 335  */
 336 static inline snd_pcm_subformat_t
 337 params_subformat(const struct snd_pcm_hw_params *p)
 338 {
 339         return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
 340                 SNDRV_PCM_HW_PARAM_SUBFORMAT));
 341 }
 342
 343 /**
 344  * params_period_bytes - get the period size (in bytes) from the hw params
 345  * @p: hw params
 346  */
 347 static inline unsigned int
 348 params_period_bytes(const struct snd_pcm_hw_params *p)
 349 {
 350         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
 351 }
 352
 353 /**
 354  * params_width - get the number of bits of the sample format from the hw params
 355  * @p: hw params
 356  *
 357  * This function returns the number of bits per sample that the selected sample
 358  * format of the hw params has.
 359  */
 360 static inline int params_width(const struct snd_pcm_hw_params *p)
 361 {
 362         return snd_pcm_format_width(params_format(p));
 363 }
 364
 365 /*
 366  * params_physical_width - get the storage size of the sample format from the hw params
 367  * @p: hw params
 368  *
 369  * This functions returns the number of bits per sample that the selected sample
 370  * format of the hw params takes up in memory. This will be equal or larger than
 371  * params_width().
 372  */
 373 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
 374 {
 375         return snd_pcm_format_physical_width(params_format(p));
 376 }
 377
 378 static inline void
 379 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
 380 {
 381         snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
 382 }
 383
 384 #endif /* __SOUND_PCM_PARAMS_H */