377 lines
9.0 KiB
C
377 lines
9.0 KiB
C
#ifndef __SOUND_PCM_PARAMS_H
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#define __SOUND_PCM_PARAMS_H
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/*
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* PCM params helpers
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* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/pcm.h>
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int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
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struct snd_pcm_hw_params *params,
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snd_pcm_hw_param_t var, int *dir);
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int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
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struct snd_pcm_hw_params *params,
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snd_pcm_hw_param_t var, int *dir);
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int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
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snd_pcm_hw_param_t var, int *dir);
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#define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
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#define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
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#define MASK_OFS(i) ((i) >> 5)
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#define MASK_BIT(i) (1U << ((i) & 31))
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static inline size_t snd_mask_sizeof(void)
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{
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return sizeof(struct snd_mask);
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}
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static inline void snd_mask_none(struct snd_mask *mask)
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{
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memset(mask, 0, sizeof(*mask));
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}
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static inline void snd_mask_any(struct snd_mask *mask)
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{
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memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
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}
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static inline int snd_mask_empty(const struct snd_mask *mask)
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{
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int i;
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for (i = 0; i < SNDRV_MASK_SIZE; i++)
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if (mask->bits[i])
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return 0;
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return 1;
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}
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static inline unsigned int snd_mask_min(const struct snd_mask *mask)
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{
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int i;
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for (i = 0; i < SNDRV_MASK_SIZE; i++) {
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if (mask->bits[i])
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return __ffs(mask->bits[i]) + (i << 5);
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}
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return 0;
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}
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static inline unsigned int snd_mask_max(const struct snd_mask *mask)
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{
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int i;
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for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
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if (mask->bits[i])
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return __fls(mask->bits[i]) + (i << 5);
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}
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return 0;
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}
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static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
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{
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mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
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}
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static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
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{
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mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
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}
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static inline void snd_mask_set_range(struct snd_mask *mask,
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unsigned int from, unsigned int to)
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{
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unsigned int i;
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for (i = from; i <= to; i++)
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mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
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}
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static inline void snd_mask_reset_range(struct snd_mask *mask,
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unsigned int from, unsigned int to)
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{
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unsigned int i;
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for (i = from; i <= to; i++)
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mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
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}
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static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
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{
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unsigned int v;
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v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
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snd_mask_none(mask);
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mask->bits[MASK_OFS(val)] = v;
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}
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static inline void snd_mask_intersect(struct snd_mask *mask,
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const struct snd_mask *v)
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{
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int i;
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for (i = 0; i < SNDRV_MASK_SIZE; i++)
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mask->bits[i] &= v->bits[i];
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}
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static inline int snd_mask_eq(const struct snd_mask *mask,
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const struct snd_mask *v)
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{
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return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
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}
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static inline void snd_mask_copy(struct snd_mask *mask,
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const struct snd_mask *v)
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{
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*mask = *v;
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}
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static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
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{
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return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
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}
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static inline int snd_mask_single(const struct snd_mask *mask)
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{
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int i, c = 0;
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for (i = 0; i < SNDRV_MASK_SIZE; i++) {
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if (! mask->bits[i])
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continue;
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if (mask->bits[i] & (mask->bits[i] - 1))
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return 0;
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if (c)
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return 0;
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c++;
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}
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return 1;
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}
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static inline int snd_mask_refine(struct snd_mask *mask,
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const struct snd_mask *v)
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{
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struct snd_mask old;
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snd_mask_copy(&old, mask);
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snd_mask_intersect(mask, v);
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if (snd_mask_empty(mask))
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return -EINVAL;
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return !snd_mask_eq(mask, &old);
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}
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static inline int snd_mask_refine_first(struct snd_mask *mask)
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{
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if (snd_mask_single(mask))
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return 0;
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snd_mask_leave(mask, snd_mask_min(mask));
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return 1;
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}
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static inline int snd_mask_refine_last(struct snd_mask *mask)
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{
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if (snd_mask_single(mask))
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return 0;
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snd_mask_leave(mask, snd_mask_max(mask));
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return 1;
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}
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static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
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{
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if (snd_mask_min(mask) >= val)
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return 0;
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snd_mask_reset_range(mask, 0, val - 1);
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if (snd_mask_empty(mask))
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return -EINVAL;
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return 1;
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}
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static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
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{
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if (snd_mask_max(mask) <= val)
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return 0;
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snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
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if (snd_mask_empty(mask))
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return -EINVAL;
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return 1;
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}
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static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
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{
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int changed;
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changed = !snd_mask_single(mask);
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snd_mask_leave(mask, val);
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if (snd_mask_empty(mask))
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return -EINVAL;
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return changed;
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}
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static inline int snd_mask_value(const struct snd_mask *mask)
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{
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return snd_mask_min(mask);
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}
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static inline void snd_interval_any(struct snd_interval *i)
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{
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i->min = 0;
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i->openmin = 0;
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i->max = UINT_MAX;
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i->openmax = 0;
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i->integer = 0;
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i->empty = 0;
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}
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static inline void snd_interval_none(struct snd_interval *i)
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{
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i->empty = 1;
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}
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static inline int snd_interval_checkempty(const struct snd_interval *i)
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{
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return (i->min > i->max ||
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(i->min == i->max && (i->openmin || i->openmax)));
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}
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static inline int snd_interval_empty(const struct snd_interval *i)
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{
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return i->empty;
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}
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static inline int snd_interval_single(const struct snd_interval *i)
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{
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return (i->min == i->max ||
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(i->min + 1 == i->max && i->openmax));
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}
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static inline int snd_interval_value(const struct snd_interval *i)
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{
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return i->min;
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}
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static inline int snd_interval_min(const struct snd_interval *i)
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{
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return i->min;
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}
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static inline int snd_interval_max(const struct snd_interval *i)
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{
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unsigned int v;
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v = i->max;
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if (i->openmax)
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v--;
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return v;
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}
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static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
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{
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return !((i->min > val || (i->min == val && i->openmin) ||
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i->max < val || (i->max == val && i->openmax)));
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}
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static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
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{
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*d = *s;
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}
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static inline int snd_interval_setinteger(struct snd_interval *i)
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{
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if (i->integer)
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return 0;
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if (i->openmin && i->openmax && i->min == i->max)
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return -EINVAL;
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i->integer = 1;
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return 1;
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}
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static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
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{
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if (i1->empty)
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return i2->empty;
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if (i2->empty)
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return i1->empty;
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return i1->min == i2->min && i1->openmin == i2->openmin &&
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i1->max == i2->max && i1->openmax == i2->openmax;
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}
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/**
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* params_access - get the access type from the hw params
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* @p: hw params
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*/
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static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
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{
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return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
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SNDRV_PCM_HW_PARAM_ACCESS));
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}
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/**
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* params_format - get the sample format from the hw params
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* @p: hw params
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*/
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static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
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{
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return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
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SNDRV_PCM_HW_PARAM_FORMAT));
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}
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/**
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* params_subformat - get the sample subformat from the hw params
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* @p: hw params
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*/
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static inline snd_pcm_subformat_t
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params_subformat(const struct snd_pcm_hw_params *p)
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{
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return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
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SNDRV_PCM_HW_PARAM_SUBFORMAT));
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}
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/**
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* params_period_bytes - get the period size (in bytes) from the hw params
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* @p: hw params
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*/
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static inline unsigned int
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params_period_bytes(const struct snd_pcm_hw_params *p)
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{
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return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
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}
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/**
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* params_width - get the number of bits of the sample format from the hw params
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* @p: hw params
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*
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* This function returns the number of bits per sample that the selected sample
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* format of the hw params has.
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*/
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static inline int params_width(const struct snd_pcm_hw_params *p)
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{
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return snd_pcm_format_width(params_format(p));
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}
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/*
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* params_physical_width - get the storage size of the sample format from the hw params
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* @p: hw params
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*
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* This functions returns the number of bits per sample that the selected sample
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* format of the hw params takes up in memory. This will be equal or larger than
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* params_width().
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*/
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static inline int params_physical_width(const struct snd_pcm_hw_params *p)
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{
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return snd_pcm_format_physical_width(params_format(p));
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}
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static inline void
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params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
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{
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snd_mask_set(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT),
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(__force int)fmt);
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}
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#endif /* __SOUND_PCM_PARAMS_H */
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