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pcm_params.h
/* 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)); } int snd_pcm_hw_params_bits(const struct snd_pcm_hw_params *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 */
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