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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 | |
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 | |
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 | |
64 | static inline size_t snd_mask_sizeof(void) |
65 | { |
66 | return sizeof(struct snd_mask); |
67 | } |
68 | |
69 | static inline void snd_mask_none(struct snd_mask *mask) |
70 | { |
71 | memset(mask, 0, sizeof(*mask)); |
72 | } |
73 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
156 | static inline void snd_mask_copy(struct snd_mask *mask, |
157 | const struct snd_mask *v) |
158 | { |
159 | *mask = *v; |
160 | } |
161 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
239 | static inline int snd_mask_value(const struct snd_mask *mask) |
240 | { |
241 | return snd_mask_min(mask); |
242 | } |
243 | |
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 | |
254 | static inline void snd_interval_none(struct snd_interval *i) |
255 | { |
256 | i->empty = 1; |
257 | } |
258 | |
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 | |
265 | static inline int snd_interval_empty(const struct snd_interval *i) |
266 | { |
267 | return i->empty; |
268 | } |
269 | |
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 | |
276 | static inline int snd_interval_value(const struct snd_interval *i) |
277 | { |
278 | return i->min; |
279 | } |
280 | |
281 | static inline int snd_interval_min(const struct snd_interval *i) |
282 | { |
283 | return i->min; |
284 | } |
285 | |
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 | |
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 | |
301 | static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) |
302 | { |
303 | *d = *s; |
304 | } |
305 | |
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 | |
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 | |
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 | |
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 | #endif /* __SOUND_PCM_PARAMS_H */ |
341 | |
342 |
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