- 根目录:
- include
- sound
- pcm_params.h
#ifndef __SOUND_PCM_PARAMS_H
#define __SOUND_PCM_PARAMS_H
/*
* PCM params helpers
* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#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 size_t snd_mask_sizeof(void)
{
return sizeof(struct snd_mask);
}
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);
}
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);
}
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->openmax));
}
static inline int snd_interval_value(const struct snd_interval *i)
{
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(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT),
(__force int)fmt);
}
#endif /* __SOUND_PCM_PARAMS_H */