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pcm_params.h

#ifndef __SOUND_PCM_PARAMS_H
#define __SOUND_PCM_PARAMS_H

/*
 *  PCM params helpers
 *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 
                     struct snd_pcm_hw_params *params,
                     snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 
                    struct snd_pcm_hw_params *params,
                    snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
                     snd_pcm_hw_param_t var, int *dir);

#define SNDRV_MASK_BITS 64    /* we use so far 64bits only */
#define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
#define MASK_OFS(i)     ((i) >> 5)
#define MASK_BIT(i)     (1U << ((i) & 31))

static inline unsigned int ld2(u_int32_t v)
{
        unsigned r = 0;

        if (v >= 0x10000) {
                v >>= 16;
                r += 16;
        }
        if (v >= 0x100) {
                v >>= 8;
                r += 8;
        }
        if (v >= 0x10) {
                v >>= 4;
                r += 4;
        }
        if (v >= 4) {
                v >>= 2;
                r += 2;
        }
        if (v >= 2)
                r++;
        return r;
}

static inline size_t snd_mask_sizeof(void)
{
      return sizeof(struct snd_mask);
}

static inline void snd_mask_none(struct snd_mask *mask)
{
      memset(mask, 0, sizeof(*mask));
}

static inline void snd_mask_any(struct snd_mask *mask)
{
      memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

static inline int snd_mask_empty(const struct snd_mask *mask)
{
      int i;
      for (i = 0; i < SNDRV_MASK_SIZE; i++)
            if (mask->bits[i])
                  return 0;
      return 1;
}

static inline unsigned int snd_mask_min(const struct snd_mask *mask)
{
      int i;
      for (i = 0; i < SNDRV_MASK_SIZE; i++) {
            if (mask->bits[i])
                  return ffs(mask->bits[i]) - 1 + (i << 5);
      }
      return 0;
}

static inline unsigned int snd_mask_max(const struct snd_mask *mask)
{
      int i;
      for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
            if (mask->bits[i])
                  return ld2(mask->bits[i]) + (i << 5);
      }
      return 0;
}

static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
{
      mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
}

static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
{
      mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
}

static inline void snd_mask_set_range(struct snd_mask *mask,
                              unsigned int from, unsigned int to)
{
      unsigned int i;
      for (i = from; i <= to; i++)
            mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
}

static inline void snd_mask_reset_range(struct snd_mask *mask,
                              unsigned int from, unsigned int to)
{
      unsigned int i;
      for (i = from; i <= to; i++)
            mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
}

static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
{
      unsigned int v;
      v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
      snd_mask_none(mask);
      mask->bits[MASK_OFS(val)] = v;
}

static inline void snd_mask_intersect(struct snd_mask *mask,
                              const struct snd_mask *v)
{
      int i;
      for (i = 0; i < SNDRV_MASK_SIZE; i++)
            mask->bits[i] &= v->bits[i];
}

static inline int snd_mask_eq(const struct snd_mask *mask,
                        const struct snd_mask *v)
{
      return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

static inline void snd_mask_copy(struct snd_mask *mask,
                         const struct snd_mask *v)
{
      *mask = *v;
}

static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
{
      return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
}

static inline int snd_mask_single(const struct snd_mask *mask)
{
      int i, c = 0;
      for (i = 0; i < SNDRV_MASK_SIZE; i++) {
            if (! mask->bits[i])
                  continue;
            if (mask->bits[i] & (mask->bits[i] - 1))
                  return 0;
            if (c)
                  return 0;
            c++;
      }
      return 1;
}

static inline int snd_mask_refine(struct snd_mask *mask,
                          const struct snd_mask *v)
{
      struct snd_mask old;
      snd_mask_copy(&old, mask);
      snd_mask_intersect(mask, v);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return !snd_mask_eq(mask, &old);
}

static inline int snd_mask_refine_first(struct snd_mask *mask)
{
      if (snd_mask_single(mask))
            return 0;
      snd_mask_leave(mask, snd_mask_min(mask));
      return 1;
}

static inline int snd_mask_refine_last(struct snd_mask *mask)
{
      if (snd_mask_single(mask))
            return 0;
      snd_mask_leave(mask, snd_mask_max(mask));
      return 1;
}

static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
{
      if (snd_mask_min(mask) >= val)
            return 0;
      snd_mask_reset_range(mask, 0, val - 1);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return 1;
}

static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
{
      if (snd_mask_max(mask) <= val)
            return 0;
      snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return 1;
}

static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
{
      int changed;
      changed = !snd_mask_single(mask);
      snd_mask_leave(mask, val);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return changed;
}

static inline int snd_mask_value(const struct snd_mask *mask)
{
      return snd_mask_min(mask);
}

static inline void snd_interval_any(struct snd_interval *i)
{
      i->min = 0;
      i->openmin = 0;
      i->max = UINT_MAX;
      i->openmax = 0;
      i->integer = 0;
      i->empty = 0;
}

static inline void snd_interval_none(struct snd_interval *i)
{
      i->empty = 1;
}

static inline int snd_interval_checkempty(const struct snd_interval *i)
{
      return (i->min > i->max ||
            (i->min == i->max && (i->openmin || i->openmax)));
}

static inline int snd_interval_empty(const struct snd_interval *i)
{
      return i->empty;
}

static inline int snd_interval_single(const struct snd_interval *i)
{
      return (i->min == i->max || 
            (i->min + 1 == i->max && i->openmax));
}

static inline int snd_interval_value(const struct snd_interval *i)
{
      return i->min;
}

static inline int snd_interval_min(const struct snd_interval *i)
{
      return i->min;
}

static inline int snd_interval_max(const struct snd_interval *i)
{
      unsigned int v;
      v = i->max;
      if (i->openmax)
            v--;
      return v;
}

static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
{
      return !((i->min > val || (i->min == val && i->openmin) ||
              i->max < val || (i->max == val && i->openmax)));
}

static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
{
      *d = *s;
}

static inline int snd_interval_setinteger(struct snd_interval *i)
{
      if (i->integer)
            return 0;
      if (i->openmin && i->openmax && i->min == i->max)
            return -EINVAL;
      i->integer = 1;
      return 1;
}

static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
{
      if (i1->empty)
            return i2->empty;
      if (i2->empty)
            return i1->empty;
      return i1->min == i2->min && i1->openmin == i2->openmin &&
            i1->max == i2->max && i1->openmax == i2->openmax;
}

static inline unsigned int add(unsigned int a, unsigned int b)
{
      if (a >= UINT_MAX - b)
            return UINT_MAX;
      return a + b;
}

static inline unsigned int sub(unsigned int a, unsigned int b)
{
      if (a > b)
            return a - b;
      return 0;
}

#endif /* __SOUND_PCM_PARAMS_H */


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