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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
 *
 */

extern int snd_pcm_hw_param_mask(snd_pcm_substream_t *pcm, snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var, const snd_mask_t *val);
extern unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
                                     snd_pcm_hw_param_t var, int *dir);
extern unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
                                     snd_pcm_hw_param_t var, int *dir);
extern int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var, unsigned int val, int dir);
extern int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
                              snd_pcm_hw_param_t var);
extern int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var, unsigned int val, int dir);

/* To share the same code we have  alsa-lib */
#define INLINE static inline
#define assert(a) (void)(a)

#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))

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;
}

INLINE size_t snd_mask_sizeof(void)
{
      return sizeof(snd_mask_t);
}

INLINE void snd_mask_none(snd_mask_t *mask)
{
      memset(mask, 0, sizeof(*mask));
}

INLINE void snd_mask_any(snd_mask_t *mask)
{
      memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

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

INLINE unsigned int snd_mask_min(const snd_mask_t *mask)
{
      int i;
      assert(!snd_mask_empty(mask));
      for (i = 0; i < SNDRV_MASK_SIZE; i++) {
            if (mask->bits[i])
                  return ffs(mask->bits[i]) - 1 + (i << 5);
      }
      return 0;
}

INLINE unsigned int snd_mask_max(const snd_mask_t *mask)
{
      int i;
      assert(!snd_mask_empty(mask));
      for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
            if (mask->bits[i])
                  return ld2(mask->bits[i]) + (i << 5);
      }
      return 0;
}

INLINE void snd_mask_set(snd_mask_t *mask, unsigned int val)
{
      assert(val <= SNDRV_MASK_BITS);
      mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
}

INLINE void snd_mask_reset(snd_mask_t *mask, unsigned int val)
{
      assert(val <= SNDRV_MASK_BITS);
      mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
}

INLINE void snd_mask_set_range(snd_mask_t *mask, unsigned int from, unsigned int to)
{
      unsigned int i;
      assert(to <= SNDRV_MASK_BITS && from <= to);
      for (i = from; i <= to; i++)
            mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
}

INLINE void snd_mask_reset_range(snd_mask_t *mask, unsigned int from, unsigned int to)
{
      unsigned int i;
      assert(to <= SNDRV_MASK_BITS && from <= to);
      for (i = from; i <= to; i++)
            mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
}

INLINE void snd_mask_leave(snd_mask_t *mask, unsigned int val)
{
      unsigned int v;
      assert(val <= SNDRV_MASK_BITS);
      v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
      snd_mask_none(mask);
      mask->bits[MASK_OFS(val)] = v;
}

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

INLINE int snd_mask_eq(const snd_mask_t *mask, const snd_mask_t *v)
{
      return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

INLINE void snd_mask_copy(snd_mask_t *mask, const snd_mask_t *v)
{
      *mask = *v;
}

INLINE int snd_mask_test(const snd_mask_t *mask, unsigned int val)
{
      assert(val <= SNDRV_MASK_BITS);
      return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
}

INLINE int snd_mask_single(const snd_mask_t *mask)
{
      int i, c = 0;
      assert(!snd_mask_empty(mask));
      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;
}

INLINE int snd_mask_refine(snd_mask_t *mask, const snd_mask_t *v)
{
      snd_mask_t old;
      assert(!snd_mask_empty(mask));
      snd_mask_copy(&old, mask);
      snd_mask_intersect(mask, v);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return !snd_mask_eq(mask, &old);
}

INLINE int snd_mask_refine_first(snd_mask_t *mask)
{
      assert(!snd_mask_empty(mask));
      if (snd_mask_single(mask))
            return 0;
      snd_mask_leave(mask, snd_mask_min(mask));
      return 1;
}

INLINE int snd_mask_refine_last(snd_mask_t *mask)
{
      assert(!snd_mask_empty(mask));
      if (snd_mask_single(mask))
            return 0;
      snd_mask_leave(mask, snd_mask_max(mask));
      return 1;
}

INLINE int snd_mask_refine_min(snd_mask_t *mask, unsigned int val)
{
      assert(!snd_mask_empty(mask));
      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;
}

INLINE int snd_mask_refine_max(snd_mask_t *mask, unsigned int val)
{
      assert(!snd_mask_empty(mask));
      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;
}

INLINE int snd_mask_refine_set(snd_mask_t *mask, unsigned int val)
{
      int changed;
      assert(!snd_mask_empty(mask));
      changed = !snd_mask_single(mask);
      snd_mask_leave(mask, val);
      if (snd_mask_empty(mask))
            return -EINVAL;
      return changed;
}

INLINE int snd_mask_value(const snd_mask_t *mask)
{
      assert(!snd_mask_empty(mask));
      return snd_mask_min(mask);
}

INLINE void snd_interval_any(snd_interval_t *i)
{
      i->min = 0;
      i->openmin = 0;
      i->max = UINT_MAX;
      i->openmax = 0;
      i->integer = 0;
      i->empty = 0;
}

INLINE void snd_interval_none(snd_interval_t *i)
{
      i->empty = 1;
}

INLINE int snd_interval_checkempty(const snd_interval_t *i)
{
      return (i->min > i->max ||
            (i->min == i->max && (i->openmin || i->openmax)));
}

INLINE int snd_interval_empty(const snd_interval_t *i)
{
      return i->empty;
}

INLINE int snd_interval_single(const snd_interval_t *i)
{
      assert(!snd_interval_empty(i));
      return (i->min == i->max || 
            (i->min + 1 == i->max && i->openmax));
}

INLINE int snd_interval_value(const snd_interval_t *i)
{
      assert(snd_interval_single(i));
      return i->min;
}

INLINE int snd_interval_min(const snd_interval_t *i)
{
      assert(!snd_interval_empty(i));
      return i->min;
}

INLINE int snd_interval_max(const snd_interval_t *i)
{
      unsigned int v;
      assert(!snd_interval_empty(i));
      v = i->max;
      if (i->openmax)
            v--;
      return v;
}

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

INLINE void snd_interval_copy(snd_interval_t *d, const snd_interval_t *s)
{
      *d = *s;
}

INLINE int snd_interval_setinteger(snd_interval_t *i)
{
      if (i->integer)
            return 0;
      if (i->openmin && i->openmax && i->min == i->max)
            return -EINVAL;
      i->integer = 1;
      return 1;
}

INLINE int snd_interval_eq(const snd_interval_t *i1, const snd_interval_t *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;
}

#undef INLINE
#undef assert

#endif /* __SOUND_PCM_PARAMS_H */


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