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schrofilter.c

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <schroedinger/schrofilter.h>
#include <schroedinger/schrodebug.h>
#include <schroedinger/schrowavelet.h>
#include <schroedinger/schrotables.h>
#include <schroedinger/schrobitstream.h>
#include <schroedinger/schrohistogram.h>
#include <schroedinger/schroparams.h>
#include <schroedinger/schrovirtframe.h>

#include <string.h>
#include <math.h>

static void
sort_u8 (uint8_t * d, int n)
{
  int start = 0;
  int end = n;
  int i;
  int x;

  /* OMG bubble sort! */
  while (start < end) {
    for (i = start; i < end - 1; i++) {
      if (d[i] > d[i + 1]) {
        x = d[i];
        d[i] = d[i + 1];
        d[i + 1] = x;
      }
    }
    end--;
    for (i = end - 2; i >= start; i--) {
      if (d[i] > d[i + 1]) {
        x = d[i];
        d[i] = d[i + 1];
        d[i + 1] = x;
      }
    }
    start++;
  }
}

#ifdef unused
/* reference */
void
schro_filter_cwmN_ref (uint8_t * d, uint8_t * s1, uint8_t * s2, uint8_t * s3,
    int n, int weight)
{
  int i;
  int j;
  uint8_t list[8 + 12];

  for (i = 0; i < n; i++) {
    list[0] = s1[i + 0];
    list[1] = s1[i + 1];
    list[2] = s1[i + 2];
    list[3] = s2[i + 0];
    list[4] = s2[i + 2];
    list[5] = s3[i + 0];
    list[6] = s3[i + 1];
    list[7] = s3[i + 2];
    for (j = 0; j < weight; j++) {
      list[8 + j] = s2[i + 1];
    }

    sort_u8 (list, 8 + weight);

    d[i] = list[(8 + weight) / 2];
  }
}
#endif

void
schro_filter_cwmN (uint8_t * d, uint8_t * s1, uint8_t * s2, uint8_t * s3, int n,
    int weight)
{
  int i;
  int j;
  uint8_t list[8 + 12];
  int low, hi;

  for (i = 0; i < n; i++) {
    list[0] = s1[i + 0];
    list[1] = s1[i + 1];
    list[2] = s1[i + 2];
    list[3] = s2[i + 0];
    list[4] = s2[i + 2];
    list[5] = s3[i + 0];
    list[6] = s3[i + 1];
    list[7] = s3[i + 2];

    low = 0;
    hi = 0;
    for (j = 0; j < 8; j++) {
      if (list[j] < s2[i + 1])
        low++;
      if (list[j] > s2[i + 1])
        hi++;
    }

    if (low < ((9 - weight) / 2) || hi < ((9 - weight) / 2)) {
      for (j = 0; j < weight; j++) {
        list[8 + j] = s2[i + 1];
      }

      sort_u8 (list, 8 + weight);

      d[i] = list[(8 + weight) / 2];
    } else {
      d[i] = s2[i + 1];
    }
  }
}

static void
schro_frame_component_filter_cwmN (SchroFrameData * comp, int weight)
{
  int i;
  uint8_t *tmp;
  uint8_t *tmp1;
  uint8_t *tmp2;

  tmp1 = schro_malloc (comp->width);
  tmp2 = schro_malloc (comp->width);

  schro_filter_cwmN (tmp1,
      OFFSET (comp->data, comp->stride * 0),
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2), comp->width - 2, weight);
  schro_filter_cwmN (tmp2,
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2),
      OFFSET (comp->data, comp->stride * 3), comp->width - 2, weight);

  for (i = 3; i < comp->height - 1; i++) {
    memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
        tmp1, comp->width - 2);
    tmp = tmp1;
    tmp1 = tmp2;
    tmp2 = tmp;

    schro_filter_cwmN (tmp2,
        OFFSET (comp->data, comp->stride * (i - 1)),
        OFFSET (comp->data, comp->stride * (i + 0)),
        OFFSET (comp->data, comp->stride * (i + 1)), comp->width - 2, weight);
  }
  memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
      tmp1, comp->width - 2);
  memcpy (OFFSET (comp->data, comp->stride * (i - 1) + 1),
      tmp2, comp->width - 2);

  schro_free (tmp1);
  schro_free (tmp2);
}

void
schro_frame_filter_cwmN (SchroFrame * frame, int weight)
{
  schro_frame_component_filter_cwmN (&frame->components[0], weight);
  schro_frame_component_filter_cwmN (&frame->components[1], weight);
  schro_frame_component_filter_cwmN (&frame->components[2], weight);
}


#ifdef unused
static void
schro_frame_component_filter_cwmN_ref (SchroFrameData * comp, int weight)
{
  int i;
  uint8_t *tmp;
  uint8_t *tmp1;
  uint8_t *tmp2;

  tmp1 = schro_malloc (comp->width);
  tmp2 = schro_malloc (comp->width);

  schro_filter_cwmN_ref (tmp1,
      OFFSET (comp->data, comp->stride * 0),
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2), comp->width - 2, weight);
  schro_filter_cwmN_ref (tmp2,
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2),
      OFFSET (comp->data, comp->stride * 3), comp->width - 2, weight);

  for (i = 3; i < comp->height - 1; i++) {
    memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
        tmp1, comp->width - 2);
    tmp = tmp1;
    tmp1 = tmp2;
    tmp2 = tmp;

    schro_filter_cwmN_ref (tmp2,
        OFFSET (comp->data, comp->stride * (i - 1)),
        OFFSET (comp->data, comp->stride * (i + 0)),
        OFFSET (comp->data, comp->stride * (i + 1)), comp->width - 2, weight);
  }
  memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
      tmp1, comp->width - 2);
  memcpy (OFFSET (comp->data, comp->stride * (i - 1) + 1),
      tmp2, comp->width - 2);

  schro_free (tmp1);
  schro_free (tmp2);
}
#endif

#ifdef unused
void
schro_frame_filter_cwmN_ref (SchroFrame * frame, int weight)
{
  schro_frame_component_filter_cwmN_ref (&frame->components[0], weight);
  schro_frame_component_filter_cwmN_ref (&frame->components[1], weight);
  schro_frame_component_filter_cwmN_ref (&frame->components[2], weight);
}
#endif


#if 0
/* reference */
void
schro_filter_cwm7 (uint8_t * d, uint8_t * s1, uint8_t * s2, uint8_t * s3, int n)
{
  int i;
  int min, max;

  for (i = 0; i < n; i++) {
    min = MIN (s1[i + 0], s1[i + 1]);
    max = MAX (s1[i + 0], s1[i + 1]);
    min = MIN (min, s1[i + 2]);
    max = MAX (max, s1[i + 2]);
    min = MIN (min, s2[i + 0]);
    max = MAX (max, s2[i + 0]);
    min = MIN (min, s2[i + 2]);
    max = MAX (max, s2[i + 2]);
    min = MIN (min, s3[i + 0]);
    max = MAX (max, s3[i + 0]);
    min = MIN (min, s3[i + 1]);
    max = MAX (max, s3[i + 1]);
    min = MIN (min, s3[i + 2]);
    max = MAX (max, s3[i + 2]);

    d[i] = MIN (max, MAX (min, s2[i + 1]));
  }
}
#endif

#ifdef unused
/* FIXME move to schrooil */
void
schro_filter_cwm7 (uint8_t * d, uint8_t * s1, uint8_t * s2, uint8_t * s3, int n)
{
  int i;
  int min, max;

  for (i = 0; i < n; i++) {
    if (s1[i + 0] < s2[i + 1]) {
      max = MAX (s1[i + 0], s1[i + 1]);
      max = MAX (max, s1[i + 2]);
      max = MAX (max, s2[i + 0]);
      max = MAX (max, s2[i + 2]);
      max = MAX (max, s3[i + 0]);
      max = MAX (max, s3[i + 1]);
      max = MAX (max, s3[i + 2]);
      d[i] = MIN (max, s2[i + 1]);
    } else if (s1[i + 0] > s2[i + 1]) {
      min = MIN (s1[i + 0], s1[i + 1]);
      min = MIN (min, s1[i + 2]);
      min = MIN (min, s2[i + 0]);
      min = MIN (min, s2[i + 2]);
      min = MIN (min, s3[i + 0]);
      min = MIN (min, s3[i + 1]);
      min = MIN (min, s3[i + 2]);
      d[i] = MAX (min, s2[i + 1]);
    } else {
      d[i] = s2[i + 1];
    }
  }
}
#endif

#ifdef unused
static void
schro_frame_component_filter_cwm7 (SchroFrameData * comp)
{
  int i;
  uint8_t *tmp;
  uint8_t *tmp1;
  uint8_t *tmp2;

  tmp1 = schro_malloc (comp->width);
  tmp2 = schro_malloc (comp->width);

  schro_filter_cwm7 (tmp1,
      OFFSET (comp->data, comp->stride * 0),
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2), comp->width - 2);
  schro_filter_cwm7 (tmp2,
      OFFSET (comp->data, comp->stride * 1),
      OFFSET (comp->data, comp->stride * 2),
      OFFSET (comp->data, comp->stride * 3), comp->width - 2);

  for (i = 3; i < comp->height - 1; i++) {
    memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
        tmp1, comp->width - 2);
    tmp = tmp1;
    tmp1 = tmp2;
    tmp2 = tmp;

    schro_filter_cwm7 (tmp2,
        OFFSET (comp->data, comp->stride * (i - 1)),
        OFFSET (comp->data, comp->stride * (i + 0)),
        OFFSET (comp->data, comp->stride * (i + 1)), comp->width - 2);
  }
  memcpy (OFFSET (comp->data, comp->stride * (i - 2) + 1),
      tmp1, comp->width - 2);
  memcpy (OFFSET (comp->data, comp->stride * (i - 1) + 1),
      tmp2, comp->width - 2);

  schro_free (tmp1);
  schro_free (tmp2);
}
#endif

#ifdef unused
void
schro_frame_filter_cwm7 (SchroFrame * frame)
{
  schro_frame_component_filter_cwm7 (&frame->components[0]);
  schro_frame_component_filter_cwm7 (&frame->components[1]);
  schro_frame_component_filter_cwm7 (&frame->components[2]);
}
#endif


static void
lowpass3_h_u8 (SchroFrame *frame, void *_dest, int component, int i)
{
  uint8_t *dest = _dest;
  uint8_t *src;
  int tap1, tap2;

  tap1 = *(int *)frame->virt_priv2;
  tap2 = 256 - 2*tap1;

  src = schro_virt_frame_get_line (frame->virt_frame1, component, i);

  if (component > 0) {
    memcpy (dest, src, frame->components[component].width);
    return;
  }

  i = 0;
  dest[i] = (src[i] * tap1 + src[i] * tap2 + src[i+1] * tap1 + 128)>>8;

  for(i=1;i<frame->width-1;i++) {
    dest[i] = (src[i-1] * tap1 + src[i] * tap2 + src[i+1] * tap1 + 128)>>8;
  }

  i = frame->width - 1;
  dest[i] = (src[i-1] * tap1 + src[i] * tap2 + src[i] * tap1 + 128)>>8;

}

static void
lowpass3_v_u8 (SchroFrame *frame, void *_dest, int component, int i)
{
  uint8_t *dest = _dest;
  uint8_t *src1, *src2, *src3;
  int tap1, tap2;

  if (component > 0) {
    src2 = schro_virt_frame_get_line (frame->virt_frame1, component, i);
    memcpy (dest, src2, frame->components[component].width);
    return;
  }

  tap1 = *(int *)frame->virt_priv2;
  tap2 = 256 - 2*tap1;

  src1 = schro_virt_frame_get_line (frame->virt_frame1, component,
      CLAMP(i-1,0,frame->height));
  src2 = schro_virt_frame_get_line (frame->virt_frame1, component, i);
  src3 = schro_virt_frame_get_line (frame->virt_frame1, component,
      CLAMP(i+1,0,frame->height));

  for(i=0;i<frame->width;i++) {
    dest[i] = (src1[i] * tap1 + src2[i] * tap2 + src3[i] * tap1 + 128)>>8;
  }

}

void
schro_frame_filter_lowpass (SchroFrame * frame, int tap)
{
  SchroFrame *vf;
  SchroFrame *vf2;
  SchroFrame *dup;

  dup = schro_frame_dup (frame);

  vf = schro_frame_new_virtual (NULL, frame->format, frame->width, frame->height);
  vf->virt_frame1 = schro_frame_ref(frame);
  vf->render_line = lowpass3_h_u8;
  vf->virt_priv2 = (void *) &tap;

  vf2 = schro_frame_new_virtual (NULL, frame->format, frame->width, frame->height);
  vf2->virt_frame1 = vf;
  vf2->render_line = lowpass3_v_u8;
  vf2->virt_priv2 = (void *) &tap;

  schro_virt_frame_render (vf2, dup);
  schro_frame_convert (frame, dup);

  schro_frame_unref (vf2);
  schro_frame_unref (dup);
}


#ifdef unused
static void
lowpass_s16 (int16_t * d, int16_t * s, int n)
{
  int i;
  int j;
  int x;
  const int32_t taps[] = { 2, 9, 28, 55, 68, 55, 28, 9, 2, 0 };
  const int32_t offsetshift[] = { 128, 8 };

  for (i = 0; i < 4; i++) {
    x = 0;
    for (j = 0; j < 9; j++) {
      x += s[CLAMP (i + j - 4, 0, n - 1)] * taps[j];
    }
    d[i] = (x + 128) >> 8;
  }
  schro_mas10_s16 (d + 4, s, taps, offsetshift, n - 9);
  for (i = n - 6; i < n; i++) {
    x = 0;
    for (j = 0; j < 9; j++) {
      x += s[CLAMP (i + j - 4, 0, n - 1)] * taps[j];
    }
    d[i] = (x + 128) >> 8;
  }
}
#endif

#ifdef unused
/* FIXME move to schrooil */
static void
lowpass_vert_s16 (int16_t * d, int16_t * s, int n)
{
  int i;
  int j;
  int x;
  static int taps[] = { 2, 9, 28, 55, 68, 55, 28, 9, 2, 0 };

  for (i = 0; i < n; i++) {
    x = 0;
    for (j = 0; j < 9; j++) {
      x += s[j * n + i] * taps[j];
    }
    d[i] = (x + 128) >> 8;
  }
}
#endif


#ifdef unused
static void
schro_frame_component_filter_lowpass_16 (SchroFrameData * comp)
{
  int i;
  int16_t *tmp;

  tmp = schro_malloc (comp->width * 9 * sizeof (int16_t));

  lowpass_s16 (tmp + 0 * comp->width,
      OFFSET (comp->data, comp->stride * 0), comp->width);
  memcpy (tmp + 1 * comp->width, tmp + 0 * comp->width, comp->width * 2);
  memcpy (tmp + 2 * comp->width, tmp + 0 * comp->width, comp->width * 2);
  memcpy (tmp + 3 * comp->width, tmp + 0 * comp->width, comp->width * 2);
  memcpy (tmp + 4 * comp->width, tmp + 0 * comp->width, comp->width * 2);
  lowpass_s16 (tmp + 5 * comp->width,
      OFFSET (comp->data, comp->stride * 1), comp->width);
  lowpass_s16 (tmp + 6 * comp->width,
      OFFSET (comp->data, comp->stride * 2), comp->width);
  lowpass_s16 (tmp + 7 * comp->width,
      OFFSET (comp->data, comp->stride * 3), comp->width);
  for (i = 0; i < comp->height; i++) {
    lowpass_s16 (tmp + 8 * comp->width,
        OFFSET (comp->data, comp->stride * CLAMP (i + 4, 0, comp->height - 1)),
        comp->width);
    lowpass_vert_s16 (OFFSET (comp->data, comp->stride * i), tmp, comp->width);
    memmove (tmp, tmp + comp->width * 1, comp->width * 8 * sizeof (int16_t));
  }

  schro_free (tmp);
}
#endif

#ifdef unused
void
schro_frame_filter_lowpass_16 (SchroFrame * frame)
{
  schro_frame_component_filter_lowpass_16 (&frame->components[0]);
  schro_frame_component_filter_lowpass_16 (&frame->components[1]);
  schro_frame_component_filter_lowpass_16 (&frame->components[2]);
}
#endif

static void
schro_convert_f64_u8 (double *dest, uint8_t * src, int n)
{
  int i;
  for (i = 0; i < n; i++) {
    dest[i] = src[i];
  }
}

static void
schro_iir3_s16_f64 (int16_t * d, int16_t * s, double *i_3, double *s2_4, int n)
{
  int i;

  for (i = 0; i < n; i++) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i_3[0] + s2_4[2] * i_3[1] + s2_4[3] * i_3[2];
    i_3[2] = i_3[1];
    i_3[1] = i_3[0];
    i_3[0] = x;
    d[i] = rint (x);
  }
}

static void
schro_iir3_rev_s16_f64 (int16_t * d, int16_t * s, double *i_3, double *s2_4,
    int n)
{
  int i;

  for (i = n - 1; i >= 0; i--) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i_3[0] + s2_4[2] * i_3[1] + s2_4[3] * i_3[2];
    i_3[2] = i_3[1];
    i_3[1] = i_3[0];
    i_3[0] = x;
    d[i] = rint (x);
  }
}

static void
schro_iir3_across_u8_f64 (uint8_t * d, uint8_t * s, double *i1, double *i2,
    double *i3, double *s2_4, int n)
{
  int i;

  for (i = 0; i < n; i++) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i1[i] + s2_4[2] * i2[i] + s2_4[3] * i3[i];
    i3[i] = i2[i];
    i2[i] = i1[i];
    i1[i] = x;
    d[i] = rint (x);
  }
}

static void
schro_iir3_across_s16_f64 (int16_t * d, int16_t * s, double *i1, double *i2,
    double *i3, double *s2_4, int n)
{
  int i;

  for (i = 0; i < n; i++) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i1[i] + s2_4[2] * i2[i] + s2_4[3] * i3[i];
    i3[i] = i2[i];
    i2[i] = i1[i];
    i1[i] = x;
    d[i] = rint (x);
  }
}

static void
schro_convert_f64_s16 (double *dest, int16_t * src, int n)
{
  int i;
  for (i = 0; i < n; i++) {
    dest[i] = src[i];
  }
}

static void
schro_iir3_u8_f64 (uint8_t * d, uint8_t * s, double *i_3, double *s2_4, int n)
{
  int i;

  for (i = 0; i < n; i++) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i_3[0] + s2_4[2] * i_3[1] + s2_4[3] * i_3[2];
    i_3[2] = i_3[1];
    i_3[1] = i_3[0];
    i_3[0] = x;
    d[i] = rint (x);
  }
}

static void
schro_iir3_rev_u8_f64 (uint8_t * d, uint8_t * s, double *i_3, double *s2_4,
    int n)
{
  int i;

  for (i = n - 1; i >= 0; i--) {
    double x;

    x = s2_4[0] * s[i] + s2_4[1] * i_3[0] + s2_4[2] * i_3[1] + s2_4[3] * i_3[2];
    i_3[2] = i_3[1];
    i_3[1] = i_3[0];
    i_3[0] = x;
    d[i] = rint (x);
  }
}

static void
lowpass2_u8 (uint8_t * d, uint8_t * s, double *coeff, int n)
{
  double state[3];

  state[0] = s[0];
  state[1] = s[0];
  state[2] = s[0];
  schro_iir3_u8_f64 (d, s, state, coeff, n);

  state[0] = d[n - 1];
  state[1] = d[n - 1];
  state[2] = d[n - 1];
  schro_iir3_rev_u8_f64 (d, s, state, coeff, n);
}

static void
lowpass2_s16 (int16_t * d, int16_t * s, double *coeff, int n)
{
  double state[3];

  state[0] = s[0];
  state[1] = s[0];
  state[2] = s[0];
  schro_iir3_s16_f64 (d, s, state, coeff, n);

  state[0] = d[n - 1];
  state[1] = d[n - 1];
  state[2] = d[n - 1];
  schro_iir3_rev_s16_f64 (d, s, state, coeff, n);
}

static void
generate_coeff (double *coeff, double sigma)
{
  double q;
  double b0, b0inv, b1, b2, b3, B;

  if (sigma >= 2.5) {
    q = 0.98711 * sigma - 0.96330;
  } else {
    q = 3.97156 - 4.41554 * sqrt (1 - 0.26891 * sigma);
  }

  b0 = 1.57825 + 2.44413 * q + 1.4281 * q * q + 0.422205 * q * q * q;
  b0inv = 1.0 / b0;
  b1 = 2.44413 * q + 2.85619 * q * q + 1.26661 * q * q * q;
  b2 = -1.4281 * q * q - 1.26661 * q * q * q;
  b3 = 0.422205 * q * q * q;
  B = 1 - (b1 + b2 + b3) / b0;

  coeff[0] = B;
  coeff[1] = b1 * b0inv;
  coeff[2] = b2 * b0inv;
  coeff[3] = b3 * b0inv;
}

static void
schro_frame_component_filter_lowpass2_u8 (SchroFrameData * comp,
    double h_sigma, double v_sigma)
{
  int i;
  double h_coeff[4];
  double v_coeff[4];
  double *i1, *i2, *i3;

  generate_coeff (h_coeff, h_sigma);
  generate_coeff (v_coeff, v_sigma);

  i1 = schro_malloc (sizeof (double) * comp->width);
  i2 = schro_malloc (sizeof (double) * comp->width);
  i3 = schro_malloc (sizeof (double) * comp->width);

  for (i = 0; i < comp->height; i++) {
    lowpass2_u8 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i), h_coeff, comp->width);
  }

  schro_convert_f64_u8 (i1, OFFSET (comp->data, comp->stride * 0), comp->width);
  memcpy (i2, i1, sizeof (double) * comp->width);
  memcpy (i3, i1, sizeof (double) * comp->width);
  for (i = 0; i < comp->height; i++) {
    schro_iir3_across_u8_f64 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i),
        i1, i2, i3, v_coeff, comp->width);
  }

  schro_convert_f64_u8 (i1, OFFSET (comp->data,
          comp->stride * (comp->height - 1)), comp->width);
  memcpy (i2, i1, sizeof (double) * comp->width);
  memcpy (i3, i1, sizeof (double) * comp->width);
  for (i = comp->height - 1; i >= 0; i--) {
    schro_iir3_across_u8_f64 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i),
        i1, i2, i3, v_coeff, comp->width);
  }

  schro_free (i1);
  schro_free (i2);
  schro_free (i3);
}

static void
schro_frame_component_filter_lowpass2_s16 (SchroFrameData * comp,
    double h_sigma, double v_sigma)
{
  int i;
  double h_coeff[4];
  double v_coeff[4];
  double *i1, *i2, *i3;

  generate_coeff (h_coeff, h_sigma);
  generate_coeff (v_coeff, v_sigma);

  i1 = schro_malloc (sizeof (double) * comp->width);
  i2 = schro_malloc (sizeof (double) * comp->width);
  i3 = schro_malloc (sizeof (double) * comp->width);

  for (i = 0; i < comp->height; i++) {
    lowpass2_s16 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i), h_coeff, comp->width);
  }

  schro_convert_f64_s16 (i1, OFFSET (comp->data, comp->stride * 0),
      comp->width);
  memcpy (i2, i1, sizeof (double) * comp->width);
  memcpy (i3, i1, sizeof (double) * comp->width);
  for (i = 0; i < comp->height; i++) {
    schro_iir3_across_s16_f64 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i),
        i1, i2, i3, v_coeff, comp->width);
  }

  schro_convert_f64_s16 (i1, OFFSET (comp->data,
          comp->stride * (comp->height - 1)), comp->width);
  memcpy (i2, i1, sizeof (double) * comp->width);
  memcpy (i3, i1, sizeof (double) * comp->width);
  for (i = comp->height - 1; i >= 0; i--) {
    schro_iir3_across_s16_f64 (OFFSET (comp->data, comp->stride * i),
        OFFSET (comp->data, comp->stride * i),
        i1, i2, i3, v_coeff, comp->width);
  }



  schro_free (i1);
  schro_free (i2);
  schro_free (i3);
}

void
schro_frame_filter_lowpass2 (SchroFrame * frame, double sigma)
{
  double chroma_sigma_h;
  double chroma_sigma_v;

  chroma_sigma_h = sigma / (1 << SCHRO_FRAME_FORMAT_H_SHIFT (frame->format));
  chroma_sigma_v = sigma / (1 << SCHRO_FRAME_FORMAT_V_SHIFT (frame->format));

  switch (SCHRO_FRAME_FORMAT_DEPTH (frame->format)) {
    case SCHRO_FRAME_FORMAT_DEPTH_U8:
      schro_frame_component_filter_lowpass2_u8 (&frame->components[0], sigma,
          sigma);
      schro_frame_component_filter_lowpass2_u8 (&frame->components[1],
          chroma_sigma_h, chroma_sigma_v);
      schro_frame_component_filter_lowpass2_u8 (&frame->components[2],
          chroma_sigma_h, chroma_sigma_v);
      break;
    case SCHRO_FRAME_FORMAT_DEPTH_S16:
      schro_frame_component_filter_lowpass2_s16 (&frame->components[0], sigma,
          sigma);
      schro_frame_component_filter_lowpass2_s16 (&frame->components[1],
          chroma_sigma_h, chroma_sigma_v);
      schro_frame_component_filter_lowpass2_s16 (&frame->components[2],
          chroma_sigma_h, chroma_sigma_v);
      break;
    default:
      SCHRO_ASSERT (0);
      break;
  }
}


#ifdef unused
void
schro_frame_filter_wavelet (SchroFrame * frame)
{
  SchroFrame *tmpframe;
  SchroFrameData *comp;
  SchroHistogram hist;
  int component;
  int16_t *tmp;
  SchroParams params;
  int i;

  tmp = schro_malloc (2 * frame->width * sizeof (int16_t));

  tmpframe = schro_frame_new_and_alloc (NULL,
      SCHRO_FRAME_FORMAT_S16_444 | frame->format,
      ROUND_UP_POW2 (frame->width, 5), ROUND_UP_POW2 (frame->height, 5));
  schro_frame_convert (tmpframe, frame);

  params.transform_depth = 1;
  params.iwt_luma_width = frame->width;
  params.iwt_luma_height = frame->height;
  params.iwt_chroma_width = frame->components[1].width;
  params.iwt_chroma_height = frame->components[1].height;

  for (component = 0; component < 3; component++) {
    comp = &tmpframe->components[component];

    schro_wavelet_transform_2d (comp, SCHRO_WAVELET_LE_GALL_5_3, tmp);

    for (i = 1; i < 4; i++) {
      SchroFrameData fd;
      int y;
      int cutoff;

      schro_subband_get_frame_data (&fd, tmpframe, component, i, &params);
      schro_histogram_init (&hist);

      for (y = 0; y < fd.height; y++) {
        schro_histogram_add_array_s16 (&hist, OFFSET (fd.data, y * fd.stride),
            fd.width);
      }

      cutoff = 100;
      for (y = 0; y < fd.height; y++) {
        int16_t *line = OFFSET (fd.data, fd.stride * y);
        int x;
        for (x = 0; x < fd.width; x++) {
          if (line[x] > -cutoff && line[x] < cutoff)
            line[x] = 0;
        }
      }
    }

    schro_wavelet_inverse_transform_2d (comp, SCHRO_WAVELET_LE_GALL_5_3, tmp);
  }

  schro_frame_convert (frame, tmpframe);
  schro_frame_unref (tmpframe);
}
#endif


static double
random_std (void)
{
  double x;
  double y;

  while (1) {
    x = -5.0 + rand () * (1.0 / RAND_MAX) * 10;
    y = rand () * (1.0 / RAND_MAX);

    if (y < exp (-x * x * 0.5))
      return x;
  }
}

static void
addnoise_u8 (uint8_t * dest, int n, double sigma)
{
  int i;
  int x;

  for (i = 0; i < n; i++) {
    x = rint (random_std () * sigma) + dest[i];
    dest[i] = CLAMP (x, 0, 255);
  }
}

static void
schro_frame_component_filter_addnoise (SchroFrameData * comp, double sigma)
{
  int i;

  for (i = 0; i < comp->height; i++) {
    addnoise_u8 (OFFSET (comp->data, comp->stride * i), comp->width, sigma);
  }
}

void
schro_frame_filter_addnoise (SchroFrame * frame, double sigma)
{
  schro_frame_component_filter_addnoise (&frame->components[0], sigma);
  schro_frame_component_filter_addnoise (&frame->components[1], sigma);
  schro_frame_component_filter_addnoise (&frame->components[2], sigma);
}


static int
ilogx_size (int i)
{
  if (i < (1 << SCHRO_HISTOGRAM_SHIFT))
    return 1;
  return 1 << ((i >> SCHRO_HISTOGRAM_SHIFT) - 1);
}

static int
iexpx (int x)
{
  if (x < (1 << SCHRO_HISTOGRAM_SHIFT))
    return x;

  return ((1 << SCHRO_HISTOGRAM_SHIFT) | (x & ((1 << SCHRO_HISTOGRAM_SHIFT) -
              1))) << ((x >> SCHRO_HISTOGRAM_SHIFT) - 1);
}


void
schro_frame_filter_adaptive_lowpass (SchroFrame * frame)
{
  SchroHistogram hist;
  double slope;
  SchroFrame *tmp;
  int16_t tmpdata[2048];
  double sigma;
  int j;
  int i;

  tmp = schro_frame_new_and_alloc (NULL,
      SCHRO_FRAME_FORMAT_S16_444 | frame->format, frame->width, frame->height);
  schro_frame_convert (tmp, frame);

  schro_wavelet_transform_2d (&tmp->components[0], SCHRO_WAVELET_LE_GALL_5_3,
      tmpdata);

  schro_histogram_init (&hist);
  for (j = 0; j < tmp->height / 2; j++) {
    schro_histogram_add_array_s16 (&hist,
        OFFSET (tmp->components[0].data,
            tmp->components[0].stride * (2 * j + 1)), tmp->width / 2);
  }

  schro_frame_unref (tmp);
  tmp = NULL;

  slope = schro_histogram_estimate_slope (&hist);

  for (i = 0; i < SCHRO_HISTOGRAM_SIZE; i++) {
    schro_dump (SCHRO_DUMP_HIST_TEST, "%d %g\n",
        iexpx (i), hist.bins[i] / ilogx_size (i));
  }

  /* good for 2 Mb DVD intra-only rip */
  sigma = -1.0 / slope;
  if (sigma > 1.0) {
    SCHRO_DEBUG ("enabling filtering (slope %g)", slope);

    schro_frame_filter_lowpass2 (frame, sigma);
  }
}

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