1 #ifndef __SOUND_PCM_PARAMS_H
2 #define __SOUND_PCM_PARAMS_H
3
4 /*
5 * PCM params helpers
6 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
7 *
8 *
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.
13 *
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.
18 *
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
22 *
23 */
24
25 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
26 struct snd_pcm_hw_params *params,
27 snd_pcm_hw_param_t var, int *dir);
28 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
29 struct snd_pcm_hw_params *params,
30 snd_pcm_hw_param_t var, int *dir);
31 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
32 snd_pcm_hw_param_t var, int *dir);
33
34 #define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
35 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
36 #define MASK_OFS(i) ((i) >> 5)
37 #define MASK_BIT(i) (1U << ((i) & 31))
38
ld2(u_int32_t v)39 static inline unsigned int ld2(u_int32_t v)
40 {
41 unsigned r = 0;
42
43 if (v >= 0x10000) {
44 v >>= 16;
45 r += 16;
46 }
47 if (v >= 0x100) {
48 v >>= 8;
49 r += 8;
50 }
51 if (v >= 0x10) {
52 v >>= 4;
53 r += 4;
54 }
55 if (v >= 4) {
56 v >>= 2;
57 r += 2;
58 }
59 if (v >= 2)
60 r++;
61 return r;
62 }
63
snd_mask_sizeof(void)64 static inline size_t snd_mask_sizeof(void)
65 {
66 return sizeof(struct snd_mask);
67 }
68
snd_mask_none(struct snd_mask * mask)69 static inline void snd_mask_none(struct snd_mask *mask)
70 {
71 memset(mask, 0, sizeof(*mask));
72 }
73
snd_mask_any(struct snd_mask * mask)74 static inline void snd_mask_any(struct snd_mask *mask)
75 {
76 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
77 }
78
snd_mask_empty(const struct snd_mask * mask)79 static inline int snd_mask_empty(const struct snd_mask *mask)
80 {
81 int i;
82 for (i = 0; i < SNDRV_MASK_SIZE; i++)
83 if (mask->bits[i])
84 return 0;
85 return 1;
86 }
87
snd_mask_min(const struct snd_mask * mask)88 static inline unsigned int snd_mask_min(const struct snd_mask *mask)
89 {
90 int i;
91 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
92 if (mask->bits[i])
93 return ffs(mask->bits[i]) - 1 + (i << 5);
94 }
95 return 0;
96 }
97
snd_mask_max(const struct snd_mask * mask)98 static inline unsigned int snd_mask_max(const struct snd_mask *mask)
99 {
100 int i;
101 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
102 if (mask->bits[i])
103 return ld2(mask->bits[i]) + (i << 5);
104 }
105 return 0;
106 }
107
snd_mask_set(struct snd_mask * mask,unsigned int val)108 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
109 {
110 mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
111 }
112
snd_mask_reset(struct snd_mask * mask,unsigned int val)113 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
114 {
115 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
116 }
117
snd_mask_set_range(struct snd_mask * mask,unsigned int from,unsigned int to)118 static inline void snd_mask_set_range(struct snd_mask *mask,
119 unsigned int from, unsigned int to)
120 {
121 unsigned int i;
122 for (i = from; i <= to; i++)
123 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
124 }
125
snd_mask_reset_range(struct snd_mask * mask,unsigned int from,unsigned int to)126 static inline void snd_mask_reset_range(struct snd_mask *mask,
127 unsigned int from, unsigned int to)
128 {
129 unsigned int i;
130 for (i = from; i <= to; i++)
131 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
132 }
133
snd_mask_leave(struct snd_mask * mask,unsigned int val)134 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
135 {
136 unsigned int v;
137 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
138 snd_mask_none(mask);
139 mask->bits[MASK_OFS(val)] = v;
140 }
141
snd_mask_intersect(struct snd_mask * mask,const struct snd_mask * v)142 static inline void snd_mask_intersect(struct snd_mask *mask,
143 const struct snd_mask *v)
144 {
145 int i;
146 for (i = 0; i < SNDRV_MASK_SIZE; i++)
147 mask->bits[i] &= v->bits[i];
148 }
149
snd_mask_eq(const struct snd_mask * mask,const struct snd_mask * v)150 static inline int snd_mask_eq(const struct snd_mask *mask,
151 const struct snd_mask *v)
152 {
153 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
154 }
155
snd_mask_copy(struct snd_mask * mask,const struct snd_mask * v)156 static inline void snd_mask_copy(struct snd_mask *mask,
157 const struct snd_mask *v)
158 {
159 *mask = *v;
160 }
161
snd_mask_test(const struct snd_mask * mask,unsigned int val)162 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
163 {
164 return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
165 }
166
snd_mask_single(const struct snd_mask * mask)167 static inline int snd_mask_single(const struct snd_mask *mask)
168 {
169 int i, c = 0;
170 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
171 if (! mask->bits[i])
172 continue;
173 if (mask->bits[i] & (mask->bits[i] - 1))
174 return 0;
175 if (c)
176 return 0;
177 c++;
178 }
179 return 1;
180 }
181
snd_mask_refine(struct snd_mask * mask,const struct snd_mask * v)182 static inline int snd_mask_refine(struct snd_mask *mask,
183 const struct snd_mask *v)
184 {
185 struct snd_mask old;
186 snd_mask_copy(&old, mask);
187 snd_mask_intersect(mask, v);
188 if (snd_mask_empty(mask))
189 return -EINVAL;
190 return !snd_mask_eq(mask, &old);
191 }
192
snd_mask_refine_first(struct snd_mask * mask)193 static inline int snd_mask_refine_first(struct snd_mask *mask)
194 {
195 if (snd_mask_single(mask))
196 return 0;
197 snd_mask_leave(mask, snd_mask_min(mask));
198 return 1;
199 }
200
snd_mask_refine_last(struct snd_mask * mask)201 static inline int snd_mask_refine_last(struct snd_mask *mask)
202 {
203 if (snd_mask_single(mask))
204 return 0;
205 snd_mask_leave(mask, snd_mask_max(mask));
206 return 1;
207 }
208
snd_mask_refine_min(struct snd_mask * mask,unsigned int val)209 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
210 {
211 if (snd_mask_min(mask) >= val)
212 return 0;
213 snd_mask_reset_range(mask, 0, val - 1);
214 if (snd_mask_empty(mask))
215 return -EINVAL;
216 return 1;
217 }
218
snd_mask_refine_max(struct snd_mask * mask,unsigned int val)219 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
220 {
221 if (snd_mask_max(mask) <= val)
222 return 0;
223 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
224 if (snd_mask_empty(mask))
225 return -EINVAL;
226 return 1;
227 }
228
snd_mask_refine_set(struct snd_mask * mask,unsigned int val)229 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
230 {
231 int changed;
232 changed = !snd_mask_single(mask);
233 snd_mask_leave(mask, val);
234 if (snd_mask_empty(mask))
235 return -EINVAL;
236 return changed;
237 }
238
snd_mask_value(const struct snd_mask * mask)239 static inline int snd_mask_value(const struct snd_mask *mask)
240 {
241 return snd_mask_min(mask);
242 }
243
snd_interval_any(struct snd_interval * i)244 static inline void snd_interval_any(struct snd_interval *i)
245 {
246 i->min = 0;
247 i->openmin = 0;
248 i->max = UINT_MAX;
249 i->openmax = 0;
250 i->integer = 0;
251 i->empty = 0;
252 }
253
snd_interval_none(struct snd_interval * i)254 static inline void snd_interval_none(struct snd_interval *i)
255 {
256 i->empty = 1;
257 }
258
snd_interval_checkempty(const struct snd_interval * i)259 static inline int snd_interval_checkempty(const struct snd_interval *i)
260 {
261 return (i->min > i->max ||
262 (i->min == i->max && (i->openmin || i->openmax)));
263 }
264
snd_interval_empty(const struct snd_interval * i)265 static inline int snd_interval_empty(const struct snd_interval *i)
266 {
267 return i->empty;
268 }
269
snd_interval_single(const struct snd_interval * i)270 static inline int snd_interval_single(const struct snd_interval *i)
271 {
272 return (i->min == i->max ||
273 (i->min + 1 == i->max && i->openmax));
274 }
275
snd_interval_value(const struct snd_interval * i)276 static inline int snd_interval_value(const struct snd_interval *i)
277 {
278 return i->min;
279 }
280
snd_interval_min(const struct snd_interval * i)281 static inline int snd_interval_min(const struct snd_interval *i)
282 {
283 return i->min;
284 }
285
snd_interval_max(const struct snd_interval * i)286 static inline int snd_interval_max(const struct snd_interval *i)
287 {
288 unsigned int v;
289 v = i->max;
290 if (i->openmax)
291 v--;
292 return v;
293 }
294
snd_interval_test(const struct snd_interval * i,unsigned int val)295 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
296 {
297 return !((i->min > val || (i->min == val && i->openmin) ||
298 i->max < val || (i->max == val && i->openmax)));
299 }
300
snd_interval_copy(struct snd_interval * d,const struct snd_interval * s)301 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
302 {
303 *d = *s;
304 }
305
snd_interval_setinteger(struct snd_interval * i)306 static inline int snd_interval_setinteger(struct snd_interval *i)
307 {
308 if (i->integer)
309 return 0;
310 if (i->openmin && i->openmax && i->min == i->max)
311 return -EINVAL;
312 i->integer = 1;
313 return 1;
314 }
315
snd_interval_eq(const struct snd_interval * i1,const struct snd_interval * i2)316 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
317 {
318 if (i1->empty)
319 return i2->empty;
320 if (i2->empty)
321 return i1->empty;
322 return i1->min == i2->min && i1->openmin == i2->openmin &&
323 i1->max == i2->max && i1->openmax == i2->openmax;
324 }
325
add(unsigned int a,unsigned int b)326 static inline unsigned int add(unsigned int a, unsigned int b)
327 {
328 if (a >= UINT_MAX - b)
329 return UINT_MAX;
330 return a + b;
331 }
332
sub(unsigned int a,unsigned int b)333 static inline unsigned int sub(unsigned int a, unsigned int b)
334 {
335 if (a > b)
336 return a - b;
337 return 0;
338 }
339
340 #define params_access(p) ((__force snd_pcm_access_t)\
341 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_ACCESS)))
342 #define params_format(p) ((__force snd_pcm_format_t)\
343 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_FORMAT)))
344 #define params_subformat(p) \
345 snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
346
347 static inline unsigned int
params_period_bytes(const struct snd_pcm_hw_params * p)348 params_period_bytes(const struct snd_pcm_hw_params *p)
349 {
350 return (params_period_size(p) *
351 snd_pcm_format_physical_width(params_format(p)) *
352 params_channels(p)) / 8;
353 }
354
355 #endif /* __SOUND_PCM_PARAMS_H */
356