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-rw-r--r--include/sound/pcm_params.h366
1 files changed, 366 insertions, 0 deletions
diff --git a/include/sound/pcm_params.h b/include/sound/pcm_params.h
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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
25extern int snd_pcm_hw_param_mask(snd_pcm_substream_t *pcm, snd_pcm_hw_params_t *params,
26 snd_pcm_hw_param_t var, const snd_mask_t *val);
27extern unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
28 snd_pcm_hw_param_t var, int *dir);
29extern unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
30 snd_pcm_hw_param_t var, int *dir);
31extern int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
32 snd_pcm_hw_param_t var, unsigned int val, int dir);
33extern int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
34 snd_pcm_hw_param_t var);
35extern int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
36 snd_pcm_hw_param_t var, unsigned int val, int dir);
37
38/* To share the same code we have alsa-lib */
39#define INLINE static inline
40#define assert(a) (void)(a)
41
42#define SNDRV_MASK_BITS 64 /* we use so far 64bits only */
43#define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
44#define MASK_OFS(i) ((i) >> 5)
45#define MASK_BIT(i) (1U << ((i) & 31))
46
47INLINE unsigned int ld2(u_int32_t v)
48{
49 unsigned r = 0;
50
51 if (v >= 0x10000) {
52 v >>= 16;
53 r += 16;
54 }
55 if (v >= 0x100) {
56 v >>= 8;
57 r += 8;
58 }
59 if (v >= 0x10) {
60 v >>= 4;
61 r += 4;
62 }
63 if (v >= 4) {
64 v >>= 2;
65 r += 2;
66 }
67 if (v >= 2)
68 r++;
69 return r;
70}
71
72INLINE size_t snd_mask_sizeof(void)
73{
74 return sizeof(snd_mask_t);
75}
76
77INLINE void snd_mask_none(snd_mask_t *mask)
78{
79 memset(mask, 0, sizeof(*mask));
80}
81
82INLINE void snd_mask_any(snd_mask_t *mask)
83{
84 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
85}
86
87INLINE int snd_mask_empty(const snd_mask_t *mask)
88{
89 int i;
90 for (i = 0; i < SNDRV_MASK_SIZE; i++)
91 if (mask->bits[i])
92 return 0;
93 return 1;
94}
95
96INLINE unsigned int snd_mask_min(const snd_mask_t *mask)
97{
98 int i;
99 assert(!snd_mask_empty(mask));
100 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
101 if (mask->bits[i])
102 return ffs(mask->bits[i]) - 1 + (i << 5);
103 }
104 return 0;
105}
106
107INLINE unsigned int snd_mask_max(const snd_mask_t *mask)
108{
109 int i;
110 assert(!snd_mask_empty(mask));
111 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
112 if (mask->bits[i])
113 return ld2(mask->bits[i]) + (i << 5);
114 }
115 return 0;
116}
117
118INLINE void snd_mask_set(snd_mask_t *mask, unsigned int val)
119{
120 assert(val <= SNDRV_MASK_BITS);
121 mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
122}
123
124INLINE void snd_mask_reset(snd_mask_t *mask, unsigned int val)
125{
126 assert(val <= SNDRV_MASK_BITS);
127 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
128}
129
130INLINE void snd_mask_set_range(snd_mask_t *mask, unsigned int from, unsigned int to)
131{
132 unsigned int i;
133 assert(to <= SNDRV_MASK_BITS && from <= to);
134 for (i = from; i <= to; i++)
135 mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
136}
137
138INLINE void snd_mask_reset_range(snd_mask_t *mask, unsigned int from, unsigned int to)
139{
140 unsigned int i;
141 assert(to <= SNDRV_MASK_BITS && from <= to);
142 for (i = from; i <= to; i++)
143 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
144}
145
146INLINE void snd_mask_leave(snd_mask_t *mask, unsigned int val)
147{
148 unsigned int v;
149 assert(val <= SNDRV_MASK_BITS);
150 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
151 snd_mask_none(mask);
152 mask->bits[MASK_OFS(val)] = v;
153}
154
155INLINE void snd_mask_intersect(snd_mask_t *mask, const snd_mask_t *v)
156{
157 int i;
158 for (i = 0; i < SNDRV_MASK_SIZE; i++)
159 mask->bits[i] &= v->bits[i];
160}
161
162INLINE int snd_mask_eq(const snd_mask_t *mask, const snd_mask_t *v)
163{
164 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
165}
166
167INLINE void snd_mask_copy(snd_mask_t *mask, const snd_mask_t *v)
168{
169 *mask = *v;
170}
171
172INLINE int snd_mask_test(const snd_mask_t *mask, unsigned int val)
173{
174 assert(val <= SNDRV_MASK_BITS);
175 return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
176}
177
178INLINE int snd_mask_single(const snd_mask_t *mask)
179{
180 int i, c = 0;
181 assert(!snd_mask_empty(mask));
182 for (i = 0; i < SNDRV_MASK_SIZE; i++) {
183 if (! mask->bits[i])
184 continue;
185 if (mask->bits[i] & (mask->bits[i] - 1))
186 return 0;
187 if (c)
188 return 0;
189 c++;
190 }
191 return 1;
192}
193
194INLINE int snd_mask_refine(snd_mask_t *mask, const snd_mask_t *v)
195{
196 snd_mask_t old;
197 assert(!snd_mask_empty(mask));
198 snd_mask_copy(&old, mask);
199 snd_mask_intersect(mask, v);
200 if (snd_mask_empty(mask))
201 return -EINVAL;
202 return !snd_mask_eq(mask, &old);
203}
204
205INLINE int snd_mask_refine_first(snd_mask_t *mask)
206{
207 assert(!snd_mask_empty(mask));
208 if (snd_mask_single(mask))
209 return 0;
210 snd_mask_leave(mask, snd_mask_min(mask));
211 return 1;
212}
213
214INLINE int snd_mask_refine_last(snd_mask_t *mask)
215{
216 assert(!snd_mask_empty(mask));
217 if (snd_mask_single(mask))
218 return 0;
219 snd_mask_leave(mask, snd_mask_max(mask));
220 return 1;
221}
222
223INLINE int snd_mask_refine_min(snd_mask_t *mask, unsigned int val)
224{
225 assert(!snd_mask_empty(mask));
226 if (snd_mask_min(mask) >= val)
227 return 0;
228 snd_mask_reset_range(mask, 0, val - 1);
229 if (snd_mask_empty(mask))
230 return -EINVAL;
231 return 1;
232}
233
234INLINE int snd_mask_refine_max(snd_mask_t *mask, unsigned int val)
235{
236 assert(!snd_mask_empty(mask));
237 if (snd_mask_max(mask) <= val)
238 return 0;
239 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
240 if (snd_mask_empty(mask))
241 return -EINVAL;
242 return 1;
243}
244
245INLINE int snd_mask_refine_set(snd_mask_t *mask, unsigned int val)
246{
247 int changed;
248 assert(!snd_mask_empty(mask));
249 changed = !snd_mask_single(mask);
250 snd_mask_leave(mask, val);
251 if (snd_mask_empty(mask))
252 return -EINVAL;
253 return changed;
254}
255
256INLINE int snd_mask_value(const snd_mask_t *mask)
257{
258 assert(!snd_mask_empty(mask));
259 return snd_mask_min(mask);
260}
261
262INLINE void snd_interval_any(snd_interval_t *i)
263{
264 i->min = 0;
265 i->openmin = 0;
266 i->max = UINT_MAX;
267 i->openmax = 0;
268 i->integer = 0;
269 i->empty = 0;
270}
271
272INLINE void snd_interval_none(snd_interval_t *i)
273{
274 i->empty = 1;
275}
276
277INLINE int snd_interval_checkempty(const snd_interval_t *i)
278{
279 return (i->min > i->max ||
280 (i->min == i->max && (i->openmin || i->openmax)));
281}
282
283INLINE int snd_interval_empty(const snd_interval_t *i)
284{
285 return i->empty;
286}
287
288INLINE int snd_interval_single(const snd_interval_t *i)
289{
290 assert(!snd_interval_empty(i));
291 return (i->min == i->max ||
292 (i->min + 1 == i->max && i->openmax));
293}
294
295INLINE int snd_interval_value(const snd_interval_t *i)
296{
297 assert(snd_interval_single(i));
298 return i->min;
299}
300
301INLINE int snd_interval_min(const snd_interval_t *i)
302{
303 assert(!snd_interval_empty(i));
304 return i->min;
305}
306
307INLINE int snd_interval_max(const snd_interval_t *i)
308{
309 unsigned int v;
310 assert(!snd_interval_empty(i));
311 v = i->max;
312 if (i->openmax)
313 v--;
314 return v;
315}
316
317INLINE int snd_interval_test(const snd_interval_t *i, unsigned int val)
318{
319 return !((i->min > val || (i->min == val && i->openmin) ||
320 i->max < val || (i->max == val && i->openmax)));
321}
322
323INLINE void snd_interval_copy(snd_interval_t *d, const snd_interval_t *s)
324{
325 *d = *s;
326}
327
328INLINE int snd_interval_setinteger(snd_interval_t *i)
329{
330 if (i->integer)
331 return 0;
332 if (i->openmin && i->openmax && i->min == i->max)
333 return -EINVAL;
334 i->integer = 1;
335 return 1;
336}
337
338INLINE int snd_interval_eq(const snd_interval_t *i1, const snd_interval_t *i2)
339{
340 if (i1->empty)
341 return i2->empty;
342 if (i2->empty)
343 return i1->empty;
344 return i1->min == i2->min && i1->openmin == i2->openmin &&
345 i1->max == i2->max && i1->openmax == i2->openmax;
346}
347
348static inline unsigned int add(unsigned int a, unsigned int b)
349{
350 if (a >= UINT_MAX - b)
351 return UINT_MAX;
352 return a + b;
353}
354
355static inline unsigned int sub(unsigned int a, unsigned int b)
356{
357 if (a > b)
358 return a - b;
359 return 0;
360}
361
362#undef INLINE
363#undef assert
364
365#endif /* __SOUND_PCM_PARAMS_H */
366
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