Root/include/sound/pcm_params.h

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

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