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0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 #ifndef __SOUND_PCM_PARAMS_H
0003 #define __SOUND_PCM_PARAMS_H
0004 
0005 /*
0006  *  PCM params helpers
0007  *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
0008  */
0009 
0010 #include <sound/pcm.h>
0011 
0012 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 
0013                struct snd_pcm_hw_params *params,
0014                snd_pcm_hw_param_t var, int *dir);
0015 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 
0016               struct snd_pcm_hw_params *params,
0017               snd_pcm_hw_param_t var, int *dir);
0018 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
0019                snd_pcm_hw_param_t var, int *dir);
0020 
0021 #define SNDRV_MASK_BITS 64  /* we use so far 64bits only */
0022 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
0023 #define MASK_OFS(i) ((i) >> 5)
0024 #define MASK_BIT(i) (1U << ((i) & 31))
0025 
0026 static inline void snd_mask_none(struct snd_mask *mask)
0027 {
0028     memset(mask, 0, sizeof(*mask));
0029 }
0030 
0031 static inline void snd_mask_any(struct snd_mask *mask)
0032 {
0033     memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
0034 }
0035 
0036 static inline int snd_mask_empty(const struct snd_mask *mask)
0037 {
0038     int i;
0039     for (i = 0; i < SNDRV_MASK_SIZE; i++)
0040         if (mask->bits[i])
0041             return 0;
0042     return 1;
0043 }
0044 
0045 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
0046 {
0047     int i;
0048     for (i = 0; i < SNDRV_MASK_SIZE; i++) {
0049         if (mask->bits[i])
0050             return __ffs(mask->bits[i]) + (i << 5);
0051     }
0052     return 0;
0053 }
0054 
0055 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
0056 {
0057     int i;
0058     for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
0059         if (mask->bits[i])
0060             return __fls(mask->bits[i]) + (i << 5);
0061     }
0062     return 0;
0063 }
0064 
0065 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
0066 {
0067     mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
0068 }
0069 
0070 /* Most of drivers need only this one */
0071 static inline void snd_mask_set_format(struct snd_mask *mask,
0072                        snd_pcm_format_t format)
0073 {
0074     snd_mask_set(mask, (__force unsigned int)format);
0075 }
0076 
0077 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
0078 {
0079     mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
0080 }
0081 
0082 static inline void snd_mask_set_range(struct snd_mask *mask,
0083                       unsigned int from, unsigned int to)
0084 {
0085     unsigned int i;
0086     for (i = from; i <= to; i++)
0087         mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
0088 }
0089 
0090 static inline void snd_mask_reset_range(struct snd_mask *mask,
0091                     unsigned int from, unsigned int to)
0092 {
0093     unsigned int i;
0094     for (i = from; i <= to; i++)
0095         mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
0096 }
0097 
0098 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
0099 {
0100     unsigned int v;
0101     v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
0102     snd_mask_none(mask);
0103     mask->bits[MASK_OFS(val)] = v;
0104 }
0105 
0106 static inline void snd_mask_intersect(struct snd_mask *mask,
0107                       const struct snd_mask *v)
0108 {
0109     int i;
0110     for (i = 0; i < SNDRV_MASK_SIZE; i++)
0111         mask->bits[i] &= v->bits[i];
0112 }
0113 
0114 static inline int snd_mask_eq(const struct snd_mask *mask,
0115                   const struct snd_mask *v)
0116 {
0117     return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
0118 }
0119 
0120 static inline void snd_mask_copy(struct snd_mask *mask,
0121                  const struct snd_mask *v)
0122 {
0123     *mask = *v;
0124 }
0125 
0126 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
0127 {
0128     return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
0129 }
0130 
0131 /* Most of drivers need only this one */
0132 static inline int snd_mask_test_format(const struct snd_mask *mask,
0133                        snd_pcm_format_t format)
0134 {
0135     return snd_mask_test(mask, (__force unsigned int)format);
0136 }
0137 
0138 static inline int snd_mask_single(const struct snd_mask *mask)
0139 {
0140     int i, c = 0;
0141     for (i = 0; i < SNDRV_MASK_SIZE; i++) {
0142         if (! mask->bits[i])
0143             continue;
0144         if (mask->bits[i] & (mask->bits[i] - 1))
0145             return 0;
0146         if (c)
0147             return 0;
0148         c++;
0149     }
0150     return 1;
0151 }
0152 
0153 static inline int snd_mask_refine(struct snd_mask *mask,
0154                   const struct snd_mask *v)
0155 {
0156     struct snd_mask old;
0157     snd_mask_copy(&old, mask);
0158     snd_mask_intersect(mask, v);
0159     if (snd_mask_empty(mask))
0160         return -EINVAL;
0161     return !snd_mask_eq(mask, &old);
0162 }
0163 
0164 static inline int snd_mask_refine_first(struct snd_mask *mask)
0165 {
0166     if (snd_mask_single(mask))
0167         return 0;
0168     snd_mask_leave(mask, snd_mask_min(mask));
0169     return 1;
0170 }
0171 
0172 static inline int snd_mask_refine_last(struct snd_mask *mask)
0173 {
0174     if (snd_mask_single(mask))
0175         return 0;
0176     snd_mask_leave(mask, snd_mask_max(mask));
0177     return 1;
0178 }
0179 
0180 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
0181 {
0182     if (snd_mask_min(mask) >= val)
0183         return 0;
0184     snd_mask_reset_range(mask, 0, val - 1);
0185     if (snd_mask_empty(mask))
0186         return -EINVAL;
0187     return 1;
0188 }
0189 
0190 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
0191 {
0192     if (snd_mask_max(mask) <= val)
0193         return 0;
0194     snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
0195     if (snd_mask_empty(mask))
0196         return -EINVAL;
0197     return 1;
0198 }
0199 
0200 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
0201 {
0202     int changed;
0203     changed = !snd_mask_single(mask);
0204     snd_mask_leave(mask, val);
0205     if (snd_mask_empty(mask))
0206         return -EINVAL;
0207     return changed;
0208 }
0209 
0210 static inline int snd_mask_value(const struct snd_mask *mask)
0211 {
0212     return snd_mask_min(mask);
0213 }
0214 
0215 static inline void snd_interval_any(struct snd_interval *i)
0216 {
0217     i->min = 0;
0218     i->openmin = 0;
0219     i->max = UINT_MAX;
0220     i->openmax = 0;
0221     i->integer = 0;
0222     i->empty = 0;
0223 }
0224 
0225 static inline void snd_interval_none(struct snd_interval *i)
0226 {
0227     i->empty = 1;
0228 }
0229 
0230 static inline int snd_interval_checkempty(const struct snd_interval *i)
0231 {
0232     return (i->min > i->max ||
0233         (i->min == i->max && (i->openmin || i->openmax)));
0234 }
0235 
0236 static inline int snd_interval_empty(const struct snd_interval *i)
0237 {
0238     return i->empty;
0239 }
0240 
0241 static inline int snd_interval_single(const struct snd_interval *i)
0242 {
0243     return (i->min == i->max || 
0244         (i->min + 1 == i->max && (i->openmin || i->openmax)));
0245 }
0246 
0247 static inline int snd_interval_value(const struct snd_interval *i)
0248 {
0249     if (i->openmin && !i->openmax)
0250         return i->max;
0251     return i->min;
0252 }
0253 
0254 static inline int snd_interval_min(const struct snd_interval *i)
0255 {
0256     return i->min;
0257 }
0258 
0259 static inline int snd_interval_max(const struct snd_interval *i)
0260 {
0261     unsigned int v;
0262     v = i->max;
0263     if (i->openmax)
0264         v--;
0265     return v;
0266 }
0267 
0268 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
0269 {
0270     return !((i->min > val || (i->min == val && i->openmin) ||
0271           i->max < val || (i->max == val && i->openmax)));
0272 }
0273 
0274 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
0275 {
0276     *d = *s;
0277 }
0278 
0279 static inline int snd_interval_setinteger(struct snd_interval *i)
0280 {
0281     if (i->integer)
0282         return 0;
0283     if (i->openmin && i->openmax && i->min == i->max)
0284         return -EINVAL;
0285     i->integer = 1;
0286     return 1;
0287 }
0288 
0289 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
0290 {
0291     if (i1->empty)
0292         return i2->empty;
0293     if (i2->empty)
0294         return i1->empty;
0295     return i1->min == i2->min && i1->openmin == i2->openmin &&
0296         i1->max == i2->max && i1->openmax == i2->openmax;
0297 }
0298 
0299 /**
0300  * params_access - get the access type from the hw params
0301  * @p: hw params
0302  */
0303 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
0304 {
0305     return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
0306         SNDRV_PCM_HW_PARAM_ACCESS));
0307 }
0308 
0309 /**
0310  * params_format - get the sample format from the hw params
0311  * @p: hw params
0312  */
0313 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
0314 {
0315     return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
0316         SNDRV_PCM_HW_PARAM_FORMAT));
0317 }
0318 
0319 /**
0320  * params_subformat - get the sample subformat from the hw params
0321  * @p: hw params
0322  */
0323 static inline snd_pcm_subformat_t
0324 params_subformat(const struct snd_pcm_hw_params *p)
0325 {
0326     return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
0327         SNDRV_PCM_HW_PARAM_SUBFORMAT));
0328 }
0329 
0330 /**
0331  * params_period_bytes - get the period size (in bytes) from the hw params
0332  * @p: hw params
0333  */
0334 static inline unsigned int
0335 params_period_bytes(const struct snd_pcm_hw_params *p)
0336 {
0337     return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
0338 }
0339 
0340 /**
0341  * params_width - get the number of bits of the sample format from the hw params
0342  * @p: hw params
0343  *
0344  * This function returns the number of bits per sample that the selected sample
0345  * format of the hw params has.
0346  */
0347 static inline int params_width(const struct snd_pcm_hw_params *p)
0348 {
0349     return snd_pcm_format_width(params_format(p));
0350 }
0351 
0352 /*
0353  * params_physical_width - get the storage size of the sample format from the hw params
0354  * @p: hw params
0355  *
0356  * This functions returns the number of bits per sample that the selected sample
0357  * format of the hw params takes up in memory. This will be equal or larger than
0358  * params_width().
0359  */
0360 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
0361 {
0362     return snd_pcm_format_physical_width(params_format(p));
0363 }
0364 
0365 static inline void
0366 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
0367 {
0368     snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
0369 }
0370 
0371 #endif /* __SOUND_PCM_PARAMS_H */
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