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 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
92 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
95 static inline void snd_mask_set_range(struct snd_mask *mask,
96 unsigned int from, unsigned int to)
99 for (i = from; i <= to; i++)
100 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
103 static inline void snd_mask_reset_range(struct snd_mask *mask,
104 unsigned int from, unsigned int to)
107 for (i = from; i <= to; i++)
108 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
111 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
113 unsigned int v, bits_index;
115 bits_index = MASK_OFS(val);
116 if (bits_index < ((SNDRV_MASK_MAX+31)/32)) {
117 v = mask->bits[bits_index] & MASK_BIT(val);
119 mask->bits[bits_index] = v;
123 static inline void snd_mask_intersect(struct snd_mask *mask,
124 const struct snd_mask *v)
127 for (i = 0; i < SNDRV_MASK_SIZE; i++)
128 mask->bits[i] &= v->bits[i];
131 static inline int snd_mask_eq(const struct snd_mask *mask,
132 const struct snd_mask *v)
134 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
137 static inline void snd_mask_copy(struct snd_mask *mask,
138 const struct snd_mask *v)
143 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
145 return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
148 static inline int snd_mask_single(const struct snd_mask *mask)
151 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
154 if (mask->bits[i] & (mask->bits[i] - 1))
163 static inline int snd_mask_refine(struct snd_mask *mask,
164 const struct snd_mask *v)
167 snd_mask_copy(&old, mask);
168 snd_mask_intersect(mask, v);
169 if (snd_mask_empty(mask))
171 return !snd_mask_eq(mask, &old);
174 static inline int snd_mask_refine_first(struct snd_mask *mask)
176 if (snd_mask_single(mask))
178 snd_mask_leave(mask, snd_mask_min(mask));
182 static inline int snd_mask_refine_last(struct snd_mask *mask)
184 if (snd_mask_single(mask))
186 snd_mask_leave(mask, snd_mask_max(mask));
190 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
192 if (snd_mask_min(mask) >= val)
194 snd_mask_reset_range(mask, 0, val - 1);
195 if (snd_mask_empty(mask))
200 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
202 if (snd_mask_max(mask) <= val)
204 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
205 if (snd_mask_empty(mask))
210 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
213 changed = !snd_mask_single(mask);
214 snd_mask_leave(mask, val);
215 if (snd_mask_empty(mask))
220 static inline int snd_mask_value(const struct snd_mask *mask)
222 return snd_mask_min(mask);
225 static inline void snd_interval_any(struct snd_interval *i)
235 static inline void snd_interval_none(struct snd_interval *i)
240 static inline int snd_interval_checkempty(const struct snd_interval *i)
242 return (i->min > i->max ||
243 (i->min == i->max && (i->openmin || i->openmax)));
246 static inline int snd_interval_empty(const struct snd_interval *i)
251 static inline int snd_interval_single(const struct snd_interval *i)
253 return (i->min == i->max ||
254 (i->min + 1 == i->max && (i->openmin || i->openmax)));
257 static inline int snd_interval_value(const struct snd_interval *i)
259 if (i->openmin && !i->openmax)
264 static inline int snd_interval_min(const struct snd_interval *i)
269 static inline int snd_interval_max(const struct snd_interval *i)
278 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
280 return !((i->min > val || (i->min == val && i->openmin) ||
281 i->max < val || (i->max == val && i->openmax)));
284 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
289 static inline int snd_interval_setinteger(struct snd_interval *i)
293 if (i->openmin && i->openmax && i->min == i->max)
299 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
305 return i1->min == i2->min && i1->openmin == i2->openmin &&
306 i1->max == i2->max && i1->openmax == i2->openmax;
310 * params_access - get the access type from the hw params
313 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
315 return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
316 SNDRV_PCM_HW_PARAM_ACCESS));
320 * params_format - get the sample format from the hw params
323 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
325 return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
326 SNDRV_PCM_HW_PARAM_FORMAT));
330 * params_subformat - get the sample subformat from the hw params
333 static inline snd_pcm_subformat_t
334 params_subformat(const struct snd_pcm_hw_params *p)
336 return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
337 SNDRV_PCM_HW_PARAM_SUBFORMAT));
341 * params_period_bytes - get the period size (in bytes) from the hw params
344 static inline unsigned int
345 params_period_bytes(const struct snd_pcm_hw_params *p)
347 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
351 * params_width - get the number of bits of the sample format from the hw params
354 * This function returns the number of bits per sample that the selected sample
355 * format of the hw params has.
357 static inline int params_width(const struct snd_pcm_hw_params *p)
359 return snd_pcm_format_width(params_format(p));
363 * params_physical_width - get the storage size of the sample format from the hw params
366 * This functions returns the number of bits per sample that the selected sample
367 * format of the hw params takes up in memory. This will be equal or larger than
370 static inline int params_physical_width(const struct snd_pcm_hw_params *p)
372 return snd_pcm_format_physical_width(params_format(p));
376 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
378 snd_mask_set(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT),
382 #endif /* __SOUND_PCM_PARAMS_H */