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Diffstat (limited to '')
| -rw-r--r-- | include/sound/pcm_params.h | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/include/sound/pcm_params.h b/include/sound/pcm_params.h new file mode 100644 index 000000000..ba184f49f --- /dev/null +++ b/include/sound/pcm_params.h @@ -0,0 +1,371 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __SOUND_PCM_PARAMS_H +#define __SOUND_PCM_PARAMS_H + +/* + * PCM params helpers + * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org> + */ + +#include <sound/pcm.h> + +int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, int *dir); +int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, int *dir); +int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, int *dir); + +#define SNDRV_MASK_BITS 64 /* we use so far 64bits only */ +#define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32) +#define MASK_OFS(i) ((i) >> 5) +#define MASK_BIT(i) (1U << ((i) & 31)) + +static inline void snd_mask_none(struct snd_mask *mask) +{ + memset(mask, 0, sizeof(*mask)); +} + +static inline void snd_mask_any(struct snd_mask *mask) +{ + memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t)); +} + +static inline int snd_mask_empty(const struct snd_mask *mask) +{ + int i; + for (i = 0; i < SNDRV_MASK_SIZE; i++) + if (mask->bits[i]) + return 0; + return 1; +} + +static inline unsigned int snd_mask_min(const struct snd_mask *mask) +{ + int i; + for (i = 0; i < SNDRV_MASK_SIZE; i++) { + if (mask->bits[i]) + return __ffs(mask->bits[i]) + (i << 5); + } + return 0; +} + +static inline unsigned int snd_mask_max(const struct snd_mask *mask) +{ + int i; + for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) { + if (mask->bits[i]) + return __fls(mask->bits[i]) + (i << 5); + } + return 0; +} + +static inline void snd_mask_set(struct snd_mask *mask, unsigned int val) +{ + mask->bits[MASK_OFS(val)] |= MASK_BIT(val); +} + +/* Most of drivers need only this one */ +static inline void snd_mask_set_format(struct snd_mask *mask, + snd_pcm_format_t format) +{ + snd_mask_set(mask, (__force unsigned int)format); +} + +static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val) +{ + mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val); +} + +static inline void snd_mask_set_range(struct snd_mask *mask, + unsigned int from, unsigned int to) +{ + unsigned int i; + for (i = from; i <= to; i++) + mask->bits[MASK_OFS(i)] |= MASK_BIT(i); +} + +static inline void snd_mask_reset_range(struct snd_mask *mask, + unsigned int from, unsigned int to) +{ + unsigned int i; + for (i = from; i <= to; i++) + mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i); +} + +static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val) +{ + unsigned int v; + v = mask->bits[MASK_OFS(val)] & MASK_BIT(val); + snd_mask_none(mask); + mask->bits[MASK_OFS(val)] = v; +} + +static inline void snd_mask_intersect(struct snd_mask *mask, + const struct snd_mask *v) +{ + int i; + for (i = 0; i < SNDRV_MASK_SIZE; i++) + mask->bits[i] &= v->bits[i]; +} + +static inline int snd_mask_eq(const struct snd_mask *mask, + const struct snd_mask *v) +{ + return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t)); +} + +static inline void snd_mask_copy(struct snd_mask *mask, + const struct snd_mask *v) +{ + *mask = *v; +} + +static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val) +{ + return mask->bits[MASK_OFS(val)] & MASK_BIT(val); +} + +/* Most of drivers need only this one */ +static inline int snd_mask_test_format(const struct snd_mask *mask, + snd_pcm_format_t format) +{ + return snd_mask_test(mask, (__force unsigned int)format); +} + +static inline int snd_mask_single(const struct snd_mask *mask) +{ + int i, c = 0; + for (i = 0; i < SNDRV_MASK_SIZE; i++) { + if (! mask->bits[i]) + continue; + if (mask->bits[i] & (mask->bits[i] - 1)) + return 0; + if (c) + return 0; + c++; + } + return 1; +} + +static inline int snd_mask_refine(struct snd_mask *mask, + const struct snd_mask *v) +{ + struct snd_mask old; + snd_mask_copy(&old, mask); + snd_mask_intersect(mask, v); + if (snd_mask_empty(mask)) + return -EINVAL; + return !snd_mask_eq(mask, &old); +} + +static inline int snd_mask_refine_first(struct snd_mask *mask) +{ + if (snd_mask_single(mask)) + return 0; + snd_mask_leave(mask, snd_mask_min(mask)); + return 1; +} + +static inline int snd_mask_refine_last(struct snd_mask *mask) +{ + if (snd_mask_single(mask)) + return 0; + snd_mask_leave(mask, snd_mask_max(mask)); + return 1; +} + +static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val) +{ + if (snd_mask_min(mask) >= val) + return 0; + snd_mask_reset_range(mask, 0, val - 1); + if (snd_mask_empty(mask)) + return -EINVAL; + return 1; +} + +static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val) +{ + if (snd_mask_max(mask) <= val) + return 0; + snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS); + if (snd_mask_empty(mask)) + return -EINVAL; + return 1; +} + +static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val) +{ + int changed; + changed = !snd_mask_single(mask); + snd_mask_leave(mask, val); + if (snd_mask_empty(mask)) + return -EINVAL; + return changed; +} + +static inline int snd_mask_value(const struct snd_mask *mask) +{ + return snd_mask_min(mask); +} + +static inline void snd_interval_any(struct snd_interval *i) +{ + i->min = 0; + i->openmin = 0; + i->max = UINT_MAX; + i->openmax = 0; + i->integer = 0; + i->empty = 0; +} + +static inline void snd_interval_none(struct snd_interval *i) +{ + i->empty = 1; +} + +static inline int snd_interval_checkempty(const struct snd_interval *i) +{ + return (i->min > i->max || + (i->min == i->max && (i->openmin || i->openmax))); +} + +static inline int snd_interval_empty(const struct snd_interval *i) +{ + return i->empty; +} + +static inline int snd_interval_single(const struct snd_interval *i) +{ + return (i->min == i->max || + (i->min + 1 == i->max && (i->openmin || i->openmax))); +} + +static inline int snd_interval_value(const struct snd_interval *i) +{ + if (i->openmin && !i->openmax) + return i->max; + return i->min; +} + +static inline int snd_interval_min(const struct snd_interval *i) +{ + return i->min; +} + +static inline int snd_interval_max(const struct snd_interval *i) +{ + unsigned int v; + v = i->max; + if (i->openmax) + v--; + return v; +} + +static inline int snd_interval_test(const struct snd_interval *i, unsigned int val) +{ + return !((i->min > val || (i->min == val && i->openmin) || + i->max < val || (i->max == val && i->openmax))); +} + +static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) +{ + *d = *s; +} + +static inline int snd_interval_setinteger(struct snd_interval *i) +{ + if (i->integer) + return 0; + if (i->openmin && i->openmax && i->min == i->max) + return -EINVAL; + i->integer = 1; + return 1; +} + +static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2) +{ + if (i1->empty) + return i2->empty; + if (i2->empty) + return i1->empty; + return i1->min == i2->min && i1->openmin == i2->openmin && + i1->max == i2->max && i1->openmax == i2->openmax; +} + +/** + * params_access - get the access type from the hw params + * @p: hw params + */ +static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p) +{ + return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p, + SNDRV_PCM_HW_PARAM_ACCESS)); +} + +/** + * params_format - get the sample format from the hw params + * @p: hw params + */ +static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p) +{ + return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p, + SNDRV_PCM_HW_PARAM_FORMAT)); +} + +/** + * params_subformat - get the sample subformat from the hw params + * @p: hw params + */ +static inline snd_pcm_subformat_t +params_subformat(const struct snd_pcm_hw_params *p) +{ + return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p, + SNDRV_PCM_HW_PARAM_SUBFORMAT)); +} + +/** + * params_period_bytes - get the period size (in bytes) from the hw params + * @p: hw params + */ +static inline unsigned int +params_period_bytes(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min; +} + +/** + * params_width - get the number of bits of the sample format from the hw params + * @p: hw params + * + * This function returns the number of bits per sample that the selected sample + * format of the hw params has. + */ +static inline int params_width(const struct snd_pcm_hw_params *p) +{ + return snd_pcm_format_width(params_format(p)); +} + +/* + * params_physical_width - get the storage size of the sample format from the hw params + * @p: hw params + * + * This functions returns the number of bits per sample that the selected sample + * format of the hw params takes up in memory. This will be equal or larger than + * params_width(). + */ +static inline int params_physical_width(const struct snd_pcm_hw_params *p) +{ + return snd_pcm_format_physical_width(params_format(p)); +} + +static inline void +params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt) +{ + snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt); +} + +#endif /* __SOUND_PCM_PARAMS_H */ |