1 #ifndef __SOUND_PCM_PARAMS_H
2 #define __SOUND_PCM_PARAMS_H
6 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <sound/pcm.h>
27 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
28 struct snd_pcm_hw_params
*params
,
29 snd_pcm_hw_param_t var
, int *dir
);
30 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
31 struct snd_pcm_hw_params
*params
,
32 snd_pcm_hw_param_t var
, int *dir
);
33 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
34 snd_pcm_hw_param_t var
, int *dir
);
36 #define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
37 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
38 #define MASK_OFS(i) ((i) >> 5)
39 #define MASK_BIT(i) (1U << ((i) & 31))
41 static inline size_t snd_mask_sizeof(void)
43 return sizeof(struct snd_mask
);
46 static inline void snd_mask_none(struct snd_mask
*mask
)
48 memset(mask
, 0, sizeof(*mask
));
51 static inline void snd_mask_any(struct snd_mask
*mask
)
53 memset(mask
, 0xff, SNDRV_MASK_SIZE
* sizeof(u_int32_t
));
56 static inline int snd_mask_empty(const struct snd_mask
*mask
)
59 for (i
= 0; i
< SNDRV_MASK_SIZE
; i
++)
65 static inline unsigned int snd_mask_min(const struct snd_mask
*mask
)
68 for (i
= 0; i
< SNDRV_MASK_SIZE
; i
++) {
70 return __ffs(mask
->bits
[i
]) + (i
<< 5);
75 static inline unsigned int snd_mask_max(const struct snd_mask
*mask
)
78 for (i
= SNDRV_MASK_SIZE
- 1; i
>= 0; i
--) {
80 return __fls(mask
->bits
[i
]) + (i
<< 5);
85 static inline void snd_mask_set(struct snd_mask
*mask
, unsigned int val
)
87 mask
->bits
[MASK_OFS(val
)] |= MASK_BIT(val
);
90 /* Most of drivers need only this one */
91 static inline void snd_mask_set_format(struct snd_mask
*mask
,
92 snd_pcm_format_t format
)
94 snd_mask_set(mask
, (__force
unsigned int)format
);
97 static inline void snd_mask_reset(struct snd_mask
*mask
, unsigned int val
)
99 mask
->bits
[MASK_OFS(val
)] &= ~MASK_BIT(val
);
102 static inline void snd_mask_set_range(struct snd_mask
*mask
,
103 unsigned int from
, unsigned int to
)
106 for (i
= from
; i
<= to
; i
++)
107 mask
->bits
[MASK_OFS(i
)] |= MASK_BIT(i
);
110 static inline void snd_mask_reset_range(struct snd_mask
*mask
,
111 unsigned int from
, unsigned int to
)
114 for (i
= from
; i
<= to
; i
++)
115 mask
->bits
[MASK_OFS(i
)] &= ~MASK_BIT(i
);
118 static inline void snd_mask_leave(struct snd_mask
*mask
, unsigned int val
)
121 v
= mask
->bits
[MASK_OFS(val
)] & MASK_BIT(val
);
123 mask
->bits
[MASK_OFS(val
)] = v
;
126 static inline void snd_mask_intersect(struct snd_mask
*mask
,
127 const struct snd_mask
*v
)
130 for (i
= 0; i
< SNDRV_MASK_SIZE
; i
++)
131 mask
->bits
[i
] &= v
->bits
[i
];
134 static inline int snd_mask_eq(const struct snd_mask
*mask
,
135 const struct snd_mask
*v
)
137 return ! memcmp(mask
, v
, SNDRV_MASK_SIZE
* sizeof(u_int32_t
));
140 static inline void snd_mask_copy(struct snd_mask
*mask
,
141 const struct snd_mask
*v
)
146 static inline int snd_mask_test(const struct snd_mask
*mask
, unsigned int val
)
148 return mask
->bits
[MASK_OFS(val
)] & MASK_BIT(val
);
151 static inline int snd_mask_single(const struct snd_mask
*mask
)
154 for (i
= 0; i
< SNDRV_MASK_SIZE
; i
++) {
157 if (mask
->bits
[i
] & (mask
->bits
[i
] - 1))
166 static inline int snd_mask_refine(struct snd_mask
*mask
,
167 const struct snd_mask
*v
)
170 snd_mask_copy(&old
, mask
);
171 snd_mask_intersect(mask
, v
);
172 if (snd_mask_empty(mask
))
174 return !snd_mask_eq(mask
, &old
);
177 static inline int snd_mask_refine_first(struct snd_mask
*mask
)
179 if (snd_mask_single(mask
))
181 snd_mask_leave(mask
, snd_mask_min(mask
));
185 static inline int snd_mask_refine_last(struct snd_mask
*mask
)
187 if (snd_mask_single(mask
))
189 snd_mask_leave(mask
, snd_mask_max(mask
));
193 static inline int snd_mask_refine_min(struct snd_mask
*mask
, unsigned int val
)
195 if (snd_mask_min(mask
) >= val
)
197 snd_mask_reset_range(mask
, 0, val
- 1);
198 if (snd_mask_empty(mask
))
203 static inline int snd_mask_refine_max(struct snd_mask
*mask
, unsigned int val
)
205 if (snd_mask_max(mask
) <= val
)
207 snd_mask_reset_range(mask
, val
+ 1, SNDRV_MASK_BITS
);
208 if (snd_mask_empty(mask
))
213 static inline int snd_mask_refine_set(struct snd_mask
*mask
, unsigned int val
)
216 changed
= !snd_mask_single(mask
);
217 snd_mask_leave(mask
, val
);
218 if (snd_mask_empty(mask
))
223 static inline int snd_mask_value(const struct snd_mask
*mask
)
225 return snd_mask_min(mask
);
228 static inline void snd_interval_any(struct snd_interval
*i
)
238 static inline void snd_interval_none(struct snd_interval
*i
)
243 static inline int snd_interval_checkempty(const struct snd_interval
*i
)
245 return (i
->min
> i
->max
||
246 (i
->min
== i
->max
&& (i
->openmin
|| i
->openmax
)));
249 static inline int snd_interval_empty(const struct snd_interval
*i
)
254 static inline int snd_interval_single(const struct snd_interval
*i
)
256 return (i
->min
== i
->max
||
257 (i
->min
+ 1 == i
->max
&& (i
->openmin
|| i
->openmax
)));
260 static inline int snd_interval_value(const struct snd_interval
*i
)
262 if (i
->openmin
&& !i
->openmax
)
267 static inline int snd_interval_min(const struct snd_interval
*i
)
272 static inline int snd_interval_max(const struct snd_interval
*i
)
281 static inline int snd_interval_test(const struct snd_interval
*i
, unsigned int val
)
283 return !((i
->min
> val
|| (i
->min
== val
&& i
->openmin
) ||
284 i
->max
< val
|| (i
->max
== val
&& i
->openmax
)));
287 static inline void snd_interval_copy(struct snd_interval
*d
, const struct snd_interval
*s
)
292 static inline int snd_interval_setinteger(struct snd_interval
*i
)
296 if (i
->openmin
&& i
->openmax
&& i
->min
== i
->max
)
302 static inline int snd_interval_eq(const struct snd_interval
*i1
, const struct snd_interval
*i2
)
308 return i1
->min
== i2
->min
&& i1
->openmin
== i2
->openmin
&&
309 i1
->max
== i2
->max
&& i1
->openmax
== i2
->openmax
;
313 * params_access - get the access type from the hw params
316 static inline snd_pcm_access_t
params_access(const struct snd_pcm_hw_params
*p
)
318 return (__force snd_pcm_access_t
)snd_mask_min(hw_param_mask_c(p
,
319 SNDRV_PCM_HW_PARAM_ACCESS
));
323 * params_format - get the sample format from the hw params
326 static inline snd_pcm_format_t
params_format(const struct snd_pcm_hw_params
*p
)
328 return (__force snd_pcm_format_t
)snd_mask_min(hw_param_mask_c(p
,
329 SNDRV_PCM_HW_PARAM_FORMAT
));
333 * params_subformat - get the sample subformat from the hw params
336 static inline snd_pcm_subformat_t
337 params_subformat(const struct snd_pcm_hw_params
*p
)
339 return (__force snd_pcm_subformat_t
)snd_mask_min(hw_param_mask_c(p
,
340 SNDRV_PCM_HW_PARAM_SUBFORMAT
));
344 * params_period_bytes - get the period size (in bytes) from the hw params
347 static inline unsigned int
348 params_period_bytes(const struct snd_pcm_hw_params
*p
)
350 return hw_param_interval_c(p
, SNDRV_PCM_HW_PARAM_PERIOD_BYTES
)->min
;
354 * params_width - get the number of bits of the sample format from the hw params
357 * This function returns the number of bits per sample that the selected sample
358 * format of the hw params has.
360 static inline int params_width(const struct snd_pcm_hw_params
*p
)
362 return snd_pcm_format_width(params_format(p
));
366 * params_physical_width - get the storage size of the sample format from the hw params
369 * This functions returns the number of bits per sample that the selected sample
370 * format of the hw params takes up in memory. This will be equal or larger than
373 static inline int params_physical_width(const struct snd_pcm_hw_params
*p
)
375 return snd_pcm_format_physical_width(params_format(p
));
379 params_set_format(struct snd_pcm_hw_params
*p
, snd_pcm_format_t fmt
)
381 snd_mask_set_format(hw_param_mask(p
, SNDRV_PCM_HW_PARAM_FORMAT
), fmt
);
384 #endif /* __SOUND_PCM_PARAMS_H */