/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.

iem_bin_ambi written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2018 */


#include "m_pd.h"
#include "iemlib.h"
#include "iem_ambi.h"
#include <math.h>
#include <stdio.h>
#include <string.h>


/* -------------------------- bin_ambi_reduced_decode_fft2 ------------------------------ */
/*
** berechnet ein reduziertes Ambisonic-Decoder-Set in die HRTF-Spektren **
** Inputs: ls + Liste von 3 floats: Index [1 .. 16] + Elevation [-90 .. +90 degree] + Azimut [0 .. 360 degree] **
** Inputs: calc_inv **
** Inputs: load_HRIR + float index1..16 **
** Outputs: List of 2 symbols: left-HRIR-File-name + HRIR-table-name **
** Inputs: calc_reduced **
** "output" ...  writes the HRTF into tables **
**  **
**  **
** setzt voraus , dass die HRIR-tabele-names von 1016_1_L_HRIR .. 1016_16_L_HRIR heissen und existieren **
** setzt voraus , dass die HRTF-tabele-names von 1016_1_HRTF_re .. 1016_16_HRTF_re heissen und existieren **
** setzt voraus , dass die HRTF-tabele-names von 1016_1_HRTF_im .. 1016_16_HRTF_im heissen und existieren **
*/

typedef struct _bin_ambi_reduced_decode_fft2
{
  t_object        x_obj;
  t_atom          x_at[2];/*output filename and tablename of HRIR*/
  int             x_n_dim;/*dimension of ambisonic system*/
  int             x_n_ambi;/*number of ambi channels*/
  int             x_n_order;/*order of ambisonic system*/
  int             x_n_real_ls;/*number of real loudspeakers*/
  int             x_n_pht_ls;/*number of phantom loudspeakers*/
  int             x_seq_ok;
  int             x_fftsize;/*fftsize of blockfilter, should be 2 times of FIR-length of HRIR*/
  double          *x_inv_work1;/* n_ambi*n_ambi buffer for matrix inverse */
  double          *x_inv_work2;/* 2*n_ambi*n_ambi buffer for matrix inverse */
  double          *x_inv_buf2;/* 2*n_ambi buffer for matrix inverse */
  double          *x_transp;/* n_ls*n_ambi transposed input-buffer of decoder-matrix before inversion */
  double          *x_ls_encode;/* n_ambi*n_ls straight input-buffer of decoder-matrix before inversion */
  double          *x_prod2;/* n_ls*n_ambi output-buffer of decoder-matrix after inversion */
  double          *x_prod3;/* n_ls*n_ambi output-buffer of decoder-matrix after inversion */
  double          *x_ambi_channel_weight;
  int             *x_delta;
  int             *x_phi;
  int             *x_phi_sym;
  int             *x_sym_flag;
  BIN_AMBI_COMPLEX  *x_spec;
  BIN_AMBI_COMPLEX  *x_sin_cos;
  iemarray_t         *x_beg_fade_out_hrir;
  t_float         *x_beg_hrir;
  iemarray_t         **x_beg_hrtf_re;
  iemarray_t         **x_beg_hrtf_im;
  t_symbol        **x_hrir_filename;
  t_symbol        **x_s_hrir;
  t_symbol        **x_s_hrtf_re;
  t_symbol        **x_s_hrtf_im;
  t_symbol        *x_s_fade_out_hrir;
  void            *x_out_sign_sum;
  double          x_sqrt3;
  double          x_sqrt10_4;
  double          x_sqrt15_2;
  double          x_sqrt6_4;
  double          x_sqrt35_8;
  double          x_sqrt70_4;
  double          x_sqrt5_2;
  double          x_sqrt126_16;
  double          x_sqrt315_8;
  double          x_sqrt105_4;
  double          x_pi_over_180;
  double          x_sing_range;
} t_bin_ambi_reduced_decode_fft2;

static t_class *bin_ambi_reduced_decode_fft2_class;

static void bin_ambi_reduced_decode_fft2_init_cos(t_bin_ambi_reduced_decode_fft2 *x)
{/* initialize a whole sine and cosine wave over a fftsize array */
  int i, fftsize = x->x_fftsize;
  t_float f, g;
  BIN_AMBI_COMPLEX *sincos = x->x_sin_cos;

  g = 2.0f * 3.1415926538f / (t_float)fftsize;
  for(i=0; i<fftsize; i++)
  {
    f = g * (t_float)i;
    (*sincos).real = cos(f);
    (*sincos).imag = -sin(f); /*FFT*/
    sincos++;
  }
}

static void bin_ambi_reduced_decode_fft2_convert(t_bin_ambi_reduced_decode_fft2 *x, double *delta_deg2rad, double *phi_deg2rad, int xindex)
{
  double q = 1.0;
  double d = *delta_deg2rad;
  double p = *phi_deg2rad;
  int i;

  if(d < -90.0)
    d = -90.0;
  if(d > 90.0)
    d = 90.0;
  while(p < 0.0)
    p += 360.0;
  while(p >= 360.0)
    p -= 360.0;

  x->x_delta[xindex] = (int)(d);
  x->x_phi[xindex] = (int)(p);

  *delta_deg2rad = d*x->x_pi_over_180;
  *phi_deg2rad = p*x->x_pi_over_180;
}

static void bin_ambi_reduced_decode_fft2_do_2d(t_bin_ambi_reduced_decode_fft2 *x, int argc, t_atom *argv, int mode)
{
  double delta=0.0, phi;
  double *dw = x->x_transp;
  int xindex;
  int order=x->x_n_order;

  if(argc < 2)
  {
    post("bin_ambi_reduced_decode_fft2 ERROR: ls-input needs 1 index and 1 angle: ls_index + phi [degree]");
    return;
  }
  xindex = (int)atom_getint(argv++) - 1;
  phi = (double)atom_getfloat(argv);

  if(xindex < 0)
    xindex = 0;
  if(mode == BIN_AMBI_LS_REAL)
  {
    if(xindex >= x->x_n_real_ls)
      xindex = x->x_n_real_ls - 1;
  }
  else if(mode == BIN_AMBI_LS_PHT)
  {
    if(x->x_n_pht_ls)
    {
      if(xindex >= x->x_n_pht_ls)
        xindex = x->x_n_pht_ls - 1;
      xindex += x->x_n_real_ls;
    }
    else
      return;
  }
  else
    return;

  bin_ambi_reduced_decode_fft2_convert(x, &delta, &phi, xindex);

  dw += xindex * x->x_n_ambi;

  *dw++ = 1.0;
  *dw++ = cos(phi);
  *dw++ = sin(phi);

  if(order >= 2)
  {
    *dw++ = cos(2.0*phi);
    *dw++ = sin(2.0*phi);

    if(order >= 3)
    {
      *dw++ = cos(3.0*phi);
      *dw++ = sin(3.0*phi);
      if(order >= 4)
      {
        *dw++ = cos(4.0*phi);
        *dw++ = sin(4.0*phi);

        if(order >= 5)
        {
          *dw++ = cos(5.0*phi);
          *dw++ = sin(5.0*phi);

          if(order >= 6)
          {
            *dw++ = cos(6.0*phi);
            *dw++ = sin(6.0*phi);

            if(order >= 7)
            {
              *dw++ = cos(7.0*phi);
              *dw++ = sin(7.0*phi);

              if(order >= 8)
              {
                *dw++ = cos(8.0*phi);
                *dw++ = sin(8.0*phi);

                if(order >= 9)
                {
                  *dw++ = cos(9.0*phi);
                  *dw++ = sin(9.0*phi);

                  if(order >= 10)
                  {
                    *dw++ = cos(10.0*phi);
                    *dw++ = sin(10.0*phi);

                    if(order >= 11)
                    {
                      *dw++ = cos(11.0*phi);
                      *dw++ = sin(11.0*phi);

                      if(order >= 12)
                      {
                        *dw++ = cos(12.0*phi);
                        *dw++ = sin(12.0*phi);
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

static void bin_ambi_reduced_decode_fft2_do_3d(t_bin_ambi_reduced_decode_fft2 *x, int argc, t_atom *argv, int mode)
{
  double delta, phi;
  double cd, sd, cd2, cd3, sd2, csd, cp, sp, cp2, sp2, cp3, sp3, cp4, sp4;
  double *dw = x->x_transp;
  int xindex;
  int order=x->x_n_order;

  if(argc < 3)
  {
    post("bin_ambi_reduced_decode_fft2 ERROR: ls-input needs 1 index and 2 angles: ls index + delta [degree] + phi [degree]");
    return;
  }
  xindex = (int)atom_getint(argv++) - 1;
  delta = atom_getfloat(argv++);
  phi = atom_getfloat(argv);

  if(xindex < 0)
    xindex = 0;
  if(mode == BIN_AMBI_LS_REAL)
  {
    if(xindex >= x->x_n_real_ls)
      xindex = x->x_n_real_ls - 1;
  }
  else if(mode == BIN_AMBI_LS_PHT)
  {
    if(x->x_n_pht_ls)
    {
      if(xindex >= x->x_n_pht_ls)
        xindex = x->x_n_pht_ls - 1;
      xindex += x->x_n_real_ls;
    }
    else
      return;
  }
  else
    return;

  bin_ambi_reduced_decode_fft2_convert(x, &delta, &phi, xindex);

  cd = cos(delta);
  sd = sin(delta);
  cp = cos(phi);
  sp = sin(phi);

  dw += xindex * x->x_n_ambi;

  *dw++ = 1.0;

  *dw++ = cd * cp;
  *dw++ = cd * sp;
  *dw++ = sd;

  if(order >= 2)
  {
    cp2 = cos(2.0*phi);
    sp2 = sin(2.0*phi);
    cd2 = cd * cd;
    sd2 = sd * sd;
    csd = cd * sd;
    *dw++ = 0.5 * x->x_sqrt3 * cd2 * cp2;
    *dw++ = 0.5 * x->x_sqrt3 * cd2 * sp2;
    *dw++ = x->x_sqrt3 * csd * cp;
    *dw++ = x->x_sqrt3 * csd * sp;
    *dw++ = 0.5 * (3.0 * sd2 - 1.0);

    if(order >= 3)
    {
      cp3 = cos(3.0*phi);
      sp3 = sin(3.0*phi);
      cd3 = cd2 * cd;
      *dw++ = x->x_sqrt10_4 * cd3 * cp3;
      *dw++ = x->x_sqrt10_4 * cd3 * sp3;
      *dw++ = x->x_sqrt15_2 * cd * csd * cp2;
      *dw++ = x->x_sqrt15_2 * cd * csd * sp2;
      *dw++ = x->x_sqrt6_4 * cd * (5.0 * sd2 - 1.0) * cp;
      *dw++ = x->x_sqrt6_4 * cd * (5.0 * sd2 - 1.0) * sp;
      *dw++ = 0.5 * sd * (5.0 * sd2 - 3.0);

      if(order >= 4)
      {
        cp4 = cos(4.0*phi);
        sp4 = sin(4.0*phi);
        *dw++ = x->x_sqrt35_8 * cd2 * cd2 * cp4;
        *dw++ = x->x_sqrt35_8 * cd2 * cd2 * sp4;
        *dw++ = x->x_sqrt70_4 * cd2 * csd * cp3;
        *dw++ = x->x_sqrt70_4 * cd2 * csd * sp3;
        *dw++ = 0.5 * x->x_sqrt5_2 * cd2 * (7.0 * sd2 - 1.0) * cp2;
        *dw++ = 0.5 * x->x_sqrt5_2 * cd2 * (7.0 * sd2 - 1.0) * sp2;
        *dw++ = x->x_sqrt10_4 * csd * (7.0 * sd2 - 3.0) * cp;
        *dw++ = x->x_sqrt10_4 * csd * (7.0 * sd2 - 3.0) * sp;
        *dw++ = 0.125 * (sd2 * (35.0 * sd2 - 30.0) + 3.0);

        if(order >= 5)
        {
          *dw++ = x->x_sqrt126_16 * cd3 * cd2 * cos(5.0*phi);
          *dw++ = x->x_sqrt126_16 * cd3 * cd2 * sin(5.0*phi);
          *dw++ = x->x_sqrt315_8 * cd3 * csd * cp4;
          *dw++ = x->x_sqrt315_8 * cd3 * csd * sp4;
          *dw++ = 0.25 * x->x_sqrt70_4 * cd3 * (9.0 * sd2 - 1.0) * cp3;
          *dw++ = 0.25 * x->x_sqrt70_4 * cd3 * (9.0 * sd2 - 1.0) * sp3;
          *dw++ = x->x_sqrt105_4 * cd * csd * (3.0 * sd2 - 1.0) * cp2;
          *dw++ = x->x_sqrt105_4 * cd * csd * (3.0 * sd2 - 1.0) * sp2;
          *dw++ = 0.25 * x->x_sqrt15_2 * cd * (sd2 * (21.0 * sd2 - 14.0) + 1.0) * cp;
          *dw++ = 0.25 * x->x_sqrt15_2 * cd * (sd2 * (21.0 * sd2 - 14.0) + 1.0) * sp;
          *dw = 0.125 * sd * (sd2 * (63.0 * sd2 - 70.0) + 15.0);
        }
      }
    }
  }
}

static void bin_ambi_reduced_decode_fft2_real_ls(t_bin_ambi_reduced_decode_fft2 *x, t_symbol *s, int argc, t_atom *argv)
{
  if(x->x_n_dim == 2)
    bin_ambi_reduced_decode_fft2_do_2d(x, argc, argv, BIN_AMBI_LS_REAL);
  else
    bin_ambi_reduced_decode_fft2_do_3d(x, argc, argv, BIN_AMBI_LS_REAL);
  x->x_seq_ok = 1;
}

static void bin_ambi_reduced_decode_fft2_pht_ls(t_bin_ambi_reduced_decode_fft2 *x, t_symbol *s, int argc, t_atom *argv)
{
  if(x->x_n_dim == 2)
    bin_ambi_reduced_decode_fft2_do_2d(x, argc, argv, BIN_AMBI_LS_PHT);
  else
    bin_ambi_reduced_decode_fft2_do_3d(x, argc, argv, BIN_AMBI_LS_PHT);
}

static void bin_ambi_reduced_decode_fft2_copy_row2buf(t_bin_ambi_reduced_decode_fft2 *x, int row)
{
  int n_ambi2 = 2*x->x_n_ambi;
  int i;
  double *dw=x->x_inv_work2;
  double *db=x->x_inv_buf2;

  dw += row*n_ambi2;
  for(i=0; i<n_ambi2; i++)
    *db++ = *dw++;
}

static void bin_ambi_reduced_decode_fft2_copy_buf2row(t_bin_ambi_reduced_decode_fft2 *x, int row)
{
  int n_ambi2 = 2*x->x_n_ambi;
  int i;
  double *dw=x->x_inv_work2;
  double *db=x->x_inv_buf2;

  dw += row*n_ambi2;
  for(i=0; i<n_ambi2; i++)
    *dw++ = *db++;
}

static void bin_ambi_reduced_decode_fft2_copy_row2row(t_bin_ambi_reduced_decode_fft2 *x, int src_row, int dst_row)
{
  int n_ambi2 = 2*x->x_n_ambi;
  int i;
  double *dw_src=x->x_inv_work2;
  double *dw_dst=x->x_inv_work2;

  dw_src += src_row*n_ambi2;
  dw_dst += dst_row*n_ambi2;
  for(i=0; i<n_ambi2; i++)
    *dw_dst++ = *dw_src++;
}

static void bin_ambi_reduced_decode_fft2_xch_rows(t_bin_ambi_reduced_decode_fft2 *x, int row1, int row2)
{
  bin_ambi_reduced_decode_fft2_copy_row2buf(x, row1);
  bin_ambi_reduced_decode_fft2_copy_row2row(x, row2, row1);
  bin_ambi_reduced_decode_fft2_copy_buf2row(x, row2);
}

static void bin_ambi_reduced_decode_fft2_mul_row(t_bin_ambi_reduced_decode_fft2 *x, int row, double mul)
{
  int n_ambi2 = 2*x->x_n_ambi;
  int i;
  double *dw=x->x_inv_work2;

  dw += row*n_ambi2;
  for(i=0; i<n_ambi2; i++)
  {
    (*dw) *= mul;
    dw++;
  }
}

static void bin_ambi_reduced_decode_fft2_mul_col(t_bin_ambi_reduced_decode_fft2 *x, int col, double mul)
{
  int n_ambi = x->x_n_ambi;
  int n_ambi2 = 2*n_ambi;
  int i;
  double *dw=x->x_inv_work2;

  dw += col;
  for(i=0; i<n_ambi; i++)
  {
    (*dw) *= mul;
    dw += n_ambi2;
  }
}

static void bin_ambi_reduced_decode_fft2_mul_buf_and_add2row(t_bin_ambi_reduced_decode_fft2 *x, int row, double mul)
{
  int n_ambi2 = 2*x->x_n_ambi;
  int i;
  double *dw=x->x_inv_work2;
  double *db=x->x_inv_buf2;

  dw += row*n_ambi2;
  for(i=0; i<n_ambi2; i++)
  {
    *dw += (*db)*mul;
    dw++;
    db++;
  }
}

static int bin_ambi_reduced_decode_fft2_eval_which_element_of_col_not_zero(t_bin_ambi_reduced_decode_fft2 *x, int col, int start_row)
{
  int n_ambi = x->x_n_ambi;
  int n_ambi2 = 2*n_ambi;
  int i;
  double *dw=x->x_inv_work2;
  double singrange=x->x_sing_range;
  int ret=-1;

  dw += start_row*n_ambi2 + col;
  for(i=start_row; i<n_ambi; i++)
  {
    if((*dw > singrange) || (*dw < -singrange))
    {
      ret = i;
      i = n_ambi+1;
    }
    dw += n_ambi2;
  }
  return(ret);
}

static void bin_ambi_reduced_decode_fft2_mul1(t_bin_ambi_reduced_decode_fft2 *x)
{
  double *vec1, *beg1=x->x_ls_encode;
  double *vec2, *beg2=x->x_ls_encode;
  double *inv=x->x_inv_work1;
  double sum;
  int n_ls=x->x_n_real_ls+x->x_n_pht_ls;
  int n_ambi=x->x_n_ambi;
  int i, j, k;

  for(k=0; k<n_ambi; k++)
  {
    beg2=x->x_ls_encode;
    for(j=0; j<n_ambi; j++)
    {
      sum = 0.0;
      vec1 = beg1;
      vec2 = beg2;
      for(i=0; i<n_ls; i++)
      {
        sum += *vec1++ * *vec2++;
      }
      beg2 += n_ls;
      *inv++ = sum;
    }
    beg1 += n_ls;
  }
}

static void bin_ambi_reduced_decode_fft2_mul2(t_bin_ambi_reduced_decode_fft2 *x)
{
  int n_ls=x->x_n_real_ls+x->x_n_pht_ls;
  int n_ambi=x->x_n_ambi;
  int n_ambi2=2*n_ambi;
  int i, j, k;
  double *vec1, *beg1=x->x_transp;
  double *vec2, *beg2=x->x_inv_work2+n_ambi;
  double *vec3=x->x_prod2;
  double *acw_vec=x->x_ambi_channel_weight;
  double sum;

  for(k=0; k<n_ls; k++)
  {
    beg2=x->x_inv_work2+n_ambi;
    for(j=0; j<n_ambi; j++)
    {
      sum = 0.0;
      vec1 = beg1;
      vec2 = beg2;
      for(i=0; i<n_ambi; i++)
      {
        sum += *vec1++ * *vec2;
        vec2 += n_ambi2;
      }
      beg2++;
      *vec3++ = sum * acw_vec[j];
    }
    beg1 += n_ambi;
  }
}

/* wird ersetzt durch haendische spiegelung und reduzierung

  static void bin_ambi_reduced_decode_fft2_mul3(t_bin_ambi_reduced_decode_fft2 *x)
  {
  int i, n;
  double *dv3=x->x_prod3;
  double *dv2=x->x_prod2;
  double *dv1=x->x_prod2;
  double mw=x->x_mirror_weight;

    n = x->x_n_real_ls * x->x_n_ambi;
    for(i=0; i<n; i++)
    *dv3++ = *dv1++;
    dv2 += n;
    n = x->x_n_mrg_mir_ls * x->x_n_ambi;
    dv2 += n;
    for(i=0; i<n; i++)
    *dv3++ = *dv1++ + (*dv2++)*mw;
}*/

static void bin_ambi_reduced_decode_fft2_transp_back(t_bin_ambi_reduced_decode_fft2 *x)
{
  double *vec, *transp=x->x_transp;
  double *straight=x->x_ls_encode;
  int n_ls=x->x_n_real_ls+x->x_n_pht_ls;
  int n_ambi=x->x_n_ambi;
  int i, j;

  transp = x->x_transp;
  for(j=0; j<n_ambi; j++)
  {
    vec = transp;
    for(i=0; i<n_ls; i++)
    {
      *straight++ = *vec;
      vec += n_ambi;
    }
    transp++;
  }
}

static void bin_ambi_reduced_decode_fft2_inverse(t_bin_ambi_reduced_decode_fft2 *x)
{
  int n_ambi = x->x_n_ambi;
  int n_ambi2 = 2*n_ambi;
  int i, j, nz;
  int r,c;
  double *src=x->x_inv_work1;
  double *db=x->x_inv_work2;
  double rcp, *dv;

  dv = db;
  for(i=0; i<n_ambi; i++) /* init */
  {
    for(j=0; j<n_ambi; j++)
    {
      *dv++ = *src++;
    }
    for(j=0; j<n_ambi; j++)
    {
      if(j == i)
        *dv++ = 1.0;
      else
        *dv++ = 0.0;
    }
  }

  /* make 1 in main-diagonale, and 0 below */
  for(i=0; i<n_ambi; i++)
  {
    nz = bin_ambi_reduced_decode_fft2_eval_which_element_of_col_not_zero(x, i, i);
    if(nz < 0)
    {
      post("bin_ambi_reduced_decode_fft2 ERROR: matrix singular !!!!");
      x->x_seq_ok = 0;
      return;
    }
    else
    {
      if(nz != i)
        bin_ambi_reduced_decode_fft2_xch_rows(x, i, nz);
      dv = db + i*n_ambi2 + i;
      rcp = 1.0 /(*dv);
      bin_ambi_reduced_decode_fft2_mul_row(x, i, rcp);
      bin_ambi_reduced_decode_fft2_copy_row2buf(x, i);
      for(j=i+1; j<n_ambi; j++)
      {
        dv += n_ambi2;
        rcp = -(*dv);
        bin_ambi_reduced_decode_fft2_mul_buf_and_add2row(x, j, rcp);
      }
    }
  }

  /* make 0 above the main diagonale */
  for(i=n_ambi-1; i>=0; i--)
  {
    dv = db + i*n_ambi2 + i;
    bin_ambi_reduced_decode_fft2_copy_row2buf(x, i);
    for(j=i-1; j>=0; j--)
    {
      dv -= n_ambi2;
      rcp = -(*dv);
      bin_ambi_reduced_decode_fft2_mul_buf_and_add2row(x, j, rcp);
    }
  }

  post("matrix_inverse regular");
  x->x_seq_ok = 1;
}

static void bin_ambi_reduced_decode_fft2_calc_pinv(t_bin_ambi_reduced_decode_fft2 *x)
{
  t_garray *a;
  int npoints;
  iemarray_t *fadevec;
  int i, n;
  double *dv3=x->x_prod3;
  double *dv2=x->x_prod2;

  if(x->x_beg_fade_out_hrir == 0)
  {
    if (!(a = (t_garray *)pd_findbyclass(x->x_s_fade_out_hrir, garray_class)))
      pd_error(x, "%s: no such array", x->x_s_fade_out_hrir->s_name);
    else if (!iemarray_getarray(a, &npoints, &fadevec))
      pd_error(x, "%s: bad template for bin_ambi_reduced_decode_fft2", x->x_s_fade_out_hrir->s_name);
    else if (npoints < x->x_fftsize)
      pd_error(x, "%s: bad array-size: %d", x->x_s_fade_out_hrir->s_name, npoints);
    else
      x->x_beg_fade_out_hrir = fadevec;
  }

  bin_ambi_reduced_decode_fft2_transp_back(x);
  bin_ambi_reduced_decode_fft2_mul1(x);
  bin_ambi_reduced_decode_fft2_inverse(x);
  bin_ambi_reduced_decode_fft2_mul2(x);

  n = x->x_n_real_ls * x->x_n_ambi;
  for(i=0; i<n; i++)
    *dv3++ = *dv2++;
}

/*
x_prod:
n_ambi  columns;
n_ambi    rows;
*/

static void bin_ambi_reduced_decode_fft2_ipht_ireal_muladd(t_bin_ambi_reduced_decode_fft2 *x, t_symbol *s, int argc, t_atom *argv)
{
  int n = x->x_n_ambi;
  int i, pht_index, real_index;
  double *dv3=x->x_prod3;
  double *dv2=x->x_prod2;
  t_float mw;

  if(argc < 3)
  {
    post("bin_ambi_reduced_decode_fft2 ERROR: ipht_ireal_muladd needs 2 index and 1 mirrorweight: pht_ls_index + real_ls_index + mirror_weight_element");
    return;
  }
  pht_index = (int)atom_getint(argv++) - 1;
  real_index = (int)atom_getint(argv++) - 1;
  mw = (double)atom_getfloat(argv);

  if(pht_index < 0)
    pht_index = 0;
  if(real_index < 0)
    real_index = 0;
  if(real_index >= x->x_n_real_ls)
    real_index = x->x_n_real_ls - 1;
  if(pht_index >= x->x_n_pht_ls)
    pht_index = x->x_n_pht_ls - 1;

  dv3 += real_index*x->x_n_ambi;
  dv2 += (x->x_n_real_ls+pht_index)*x->x_n_ambi;
  for(i=0; i<n; i++)
  {
    *dv3 += (*dv2++)*mw;
    dv3++;
  }
}

static void bin_ambi_reduced_decode_fft2_load_HRIR(t_bin_ambi_reduced_decode_fft2 *x, t_symbol *s, int argc, t_atom *argv)
{
  int xindex;
  t_symbol *hrirname;

  if(argc < 2)
  {
    post("bin_ambi_reduced_decode_fft2 ERROR: load_HRIR needs 1 index and 1 HRIR-wav");
    return;
  }
  xindex = (int)atom_getint(argv++) - 1;
  hrirname = atom_getsymbol(argv);
  if(xindex < 0)
    xindex = 0;
  if(xindex >= x->x_n_real_ls)
    xindex = x->x_n_real_ls - 1;
  x->x_hrir_filename[xindex] = hrirname;

  SETSYMBOL(x->x_at, x->x_hrir_filename[xindex]);
  SETSYMBOL(x->x_at+1, x->x_s_hrir[xindex]);
  outlet_list(x->x_obj.ob_outlet, &s_list, 2, x->x_at);
}

static void bin_ambi_reduced_decode_fft2_check_HRIR_arrays(t_bin_ambi_reduced_decode_fft2 *x, t_floatarg findex)
{
  int xindex=(int)findex - 1;
  int j, k, n;
  int fftsize = x->x_fftsize;
  int fs2=fftsize/2;
  t_garray *a;
  int npoints;
  t_symbol *hrir;
  t_float *vec;
  iemarray_t *vec_hrir, *vec_fade_out_hrir;
  t_float decr, sum;

  if(xindex < 0)
    xindex = 0;
  if(xindex >= x->x_n_real_ls)
    xindex = x->x_n_real_ls - 1;

  hrir = x->x_s_hrir[xindex];
  if (!(a = (t_garray *)pd_findbyclass(hrir, garray_class)))
    pd_error(x, "%s: no such array", hrir->s_name);
  else if (!iemarray_getarray(a, &npoints, &vec_hrir))
    pd_error(x, "%s: bad template for bin_ambi_reduced_decode_fft2", hrir->s_name);
  else
  {
    if(npoints < fftsize)
    {
      post("bin_ambi_reduced_decode_fft2-WARNING: %s-array-size: %d < FFT-size: %d", hrir->s_name, npoints, fftsize);
    }
    vec = x->x_beg_hrir;
    vec += xindex * fftsize;

    if(x->x_beg_fade_out_hrir)
    {
      vec_fade_out_hrir = x->x_beg_fade_out_hrir;
      for(j=0; j<fs2; j++)
        vec[j] = iemarray_getfloat(vec_hrir, j)*iemarray_getfloat(vec_fade_out_hrir, j);
    }
    else
    {
      post("no HRIR-fade-out-window found");
      n = fs2 * 3;
      n /= 4;
      for(j=0; j<n; j++)
        vec[j] =iemarray_getfloat(vec_hrir,j);
      sum = 1.0f;
      decr = 4.0f / (t_float)fs2;
      for(j=n, k=0; j<fs2; j++, k++)
      {
        sum -= decr;
        vec[j] = iemarray_getfloat(vec_hrir,j) * sum;
      }
    }
  }
}

static void bin_ambi_reduced_decode_fft2_check_HRTF_arrays(t_bin_ambi_reduced_decode_fft2 *x, t_floatarg findex)
{
  int xindex=(int)findex - 1;
  t_garray *a;
  int npoints;
  int fftsize = x->x_fftsize;
  iemarray_t *vec_hrtf_re, *vec_hrtf_im;
  t_symbol *hrtf_re, *hrtf_im;

  if(xindex < 0)
    xindex = 0;
  if(xindex >= x->x_n_ambi)
    xindex = x->x_n_ambi - 1;

  hrtf_re = x->x_s_hrtf_re[xindex];
  hrtf_im = x->x_s_hrtf_im[xindex];

  if (!(a = (t_garray *)pd_findbyclass(hrtf_re, garray_class)))
    pd_error(x, "%s: no such array", hrtf_re->s_name);
  else if (!iemarray_getarray(a, &npoints, &vec_hrtf_re))
    pd_error(x, "%s: bad template for bin_ambi_reduced_decode_fft2", hrtf_re->s_name);
  else if (npoints < fftsize)
    pd_error(x, "%s: bad array-size: %d", hrtf_re->s_name, npoints);
  else if (!(a = (t_garray *)pd_findbyclass(hrtf_im, garray_class)))
    pd_error(x, "%s: no such array", hrtf_im->s_name);
  else if (!iemarray_getarray(a, &npoints, &vec_hrtf_im))
    pd_error(x, "%s: bad template for bin_ambi_reduced_decode_fft2", hrtf_im->s_name);
  else if (npoints < fftsize)
    pd_error(x, "%s: bad array-size: %d", hrtf_im->s_name, npoints);
  else
  {
    x->x_beg_hrtf_re[xindex] = vec_hrtf_re;
    x->x_beg_hrtf_im[xindex] = vec_hrtf_im;
  }
}

static void bin_ambi_reduced_decode_fft2_calc_reduced(t_bin_ambi_reduced_decode_fft2 *x, t_floatarg findex)
{
  int xindex=(int)findex - 1;
  int i, j, k, w_index, w_inc, i_inc, v_index, fs1, fs2;
  int fftsize = x->x_fftsize;
  BIN_AMBI_COMPLEX old1, old2, w;
  BIN_AMBI_COMPLEX *sincos = x->x_sin_cos;
  BIN_AMBI_COMPLEX *val = x->x_spec;/*weighted decoder-matrix with n_ls lines and n_ambi columns*/
  t_float *vec_hrir;
  iemarray_t*vec_hrtf_re, *vec_hrtf_im;
  double *dv, *db=x->x_prod3;
  int n_ambi = x->x_n_ambi;
  int n_ls = x->x_n_real_ls;
  t_float mul;

  if(x->x_seq_ok)
  {
    if(xindex < 0)
      xindex = 0;
    if(xindex >= n_ambi)
      xindex = n_ambi - 1;

    vec_hrtf_re = x->x_beg_hrtf_re[xindex];
    vec_hrtf_im = x->x_beg_hrtf_im[xindex];

    dv = db + xindex;
    mul = (t_float)(*dv);
    vec_hrir = x->x_beg_hrir;
    for(k=0; k<fftsize; k++)/*first step of acumulating the HRIRs*/
    {
      val[k].real = mul * vec_hrir[k];
      val[k].imag = 0.0f;
    }

    for(j=1; j<n_ls; j++)
    {
      dv += n_ambi;
      mul = (t_float)(*dv);
      vec_hrir = x->x_beg_hrir;
      vec_hrir += j * fftsize;
      for(k=0; k<fftsize; k++)
      {
        val[k].real += mul * vec_hrir[k];
      }
    }

    fs1 = fftsize - 1;
    fs2 = fftsize / 2;
    i_inc = fs2;
    w_inc = 1;
    for(i=1; i<fftsize; i<<=1)
    {
      v_index = 0;
      for(j=0; j<i; j++)
      {
        w_index = 0;
        for(k=0; k<i_inc; k++)
        {
          old1 = val[v_index];
          old2 = val[v_index+i_inc];
          w = sincos[w_index];
          val[v_index+i_inc].real = (old1.real-old2.real)*w.real - (old1.imag-old2.imag)*w.imag;
          val[v_index+i_inc].imag = (old1.imag - old2.imag)*w.real + (old1.real-old2.real)*w.imag;
          val[v_index].real = old1.real+old2.real;
          val[v_index].imag = old1.imag+old2.imag;
          w_index += w_inc;
          v_index++;
        }
        v_index += i_inc;
      }
      w_inc <<= 1;
      i_inc >>= 1;
    }

    j = 0;
    for(i=1;i<fs1;i++)
    {
      k = fs2;
      while(k <= j)
      {
        j = j - k;
        k >>= 1;
      }
      j = j + k;
      if(i < j)
      {
        old1 = val[j];
        val[j] = val[i];
        val[i] = old1;
      }
    }
    iemarray_setfloat(vec_hrtf_re, 0, val[0].real);
    for(i = 1; i<fs2; i++)
    {
      iemarray_setfloat(vec_hrtf_re, i, val[i].real);
      iemarray_setfloat(vec_hrtf_im, i, val[i].imag);
    }
    iemarray_setfloat(vec_hrtf_re, fs2, val[fs2].real);
    iemarray_setfloat(vec_hrtf_im, fs2, 0.0f);
    for(i = fs2+1; i < fftsize; i++)
    {
      iemarray_setfloat(vec_hrtf_re, i, 0.0f);
      iemarray_setfloat(vec_hrtf_im, i, 0.0f);
    }
  }
}

static void bin_ambi_reduced_decode_fft2_calc_sym(t_bin_ambi_reduced_decode_fft2 *x)
{
  int *sym=x->x_phi_sym;
  int n_ls = x->x_n_real_ls;
  int n_ambi = x->x_n_ambi;
  int n_ambi2 = 2*n_ambi;
  int *phi=x->x_phi;
  int *delta=x->x_delta;
  int *flag=x->x_sym_flag;
  int i, j, d, p, regular=1;
  double *dv, *db=x->x_prod3;
  double a, b, q;
  int sym_max=0;
  int pos_sym_counter, neg_sym_counter;
  char plus_minus[100];
  char abc[100];
  char onenine[100];
  char ten[100];

  if(x->x_seq_ok)
  {
    for(i=0; i<n_ls; i++)
      sym[i] = -1;

    plus_minus[0] = 0;
    if(x->x_n_dim == 2)
    {
      strcpy(abc,     "                      WXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXY");
      strcpy(ten,     "                      000000000000000000011111111111111111111");
      strcpy(onenine, "                      011223344556677889900112233445566778899");
      abc[n_ambi+22] = 0;
      ten[n_ambi+22] = 0;
      onenine[n_ambi+22] = 0;
      post(abc);
      post(ten);
      post(onenine);
    }
    else
    {
      strcpy(abc,     "                      AABCABCDEABCDEFGABCDEFGHIABCDEFGHIJKABCDEFGHIJKLM");
      strcpy(onenine, "                      0111222223333333444444444555555555556666666666666");
      abc[n_ambi+22] = 0;
      onenine[n_ambi+22] = 0;
      post(abc);
      post(onenine);
    }

    for(i=0; i<n_ls; i++)/* looking for azimuth symmetries of loudspeakers */
    {
      d = delta[i];
      p = phi[i];
      for(j=i+1; j<n_ls; j++)
      {
        if(d == delta[j])
        {
          if((p + phi[j]) == 360)
          {
            if((sym[i] < 0) && (sym[j] < 0))
            {
              sym[i] = j;
              sym[j] = i;
              j = n_ls + 1;
              sym_max++;
            }
          }
        }
      }
    }

    for(p=0; p<n_ambi; p++)/*each col*/
    {
      pos_sym_counter = 0;
      neg_sym_counter = 0;
      for(i=0; i<n_ls; i++)
        flag[i] = 1;
      dv = db + p;
      for(i=0; i<n_ls; i++)
      {
        if((sym[i] >= 0) && flag[i])
        {
          j = sym[i];
          flag[i] = 0;
          flag[j] = 0;
          a = dv[i*n_ambi];
          b = dv[j*n_ambi];
          if((a < 5.0e-4)&&(a > -5.0e-4)&&(b < 5.0e-4)&&(b > -5.0e-4))
          {
            pos_sym_counter++;
            neg_sym_counter++;
          }
          else
          {
            q = a / b;
            if((q < 1.005)&&(q > 0.995))
              pos_sym_counter++;
            else if((q > -1.005)&&(q < -0.995))
              neg_sym_counter++;
          }
        }
      }
      if(pos_sym_counter == sym_max)
        strcat(plus_minus, "+");
      else if(neg_sym_counter == sym_max)
        strcat(plus_minus, "-");
      else
      {
        strcat(plus_minus, "?");
        regular = 0;
      }
    }
    post("sum of right channel: %s", plus_minus);

    if(regular)
    {
      for(i=0; i<n_ambi; i++)
      {
        /*change*/
        if(plus_minus[i] == '+')
          SETFLOAT(x->x_at, 1.0f);
        else if(plus_minus[i] == '-')
          SETFLOAT(x->x_at, 2.0f);
        SETFLOAT(x->x_at+1, (t_float)(i+1));
        outlet_list(x->x_out_sign_sum, &s_list, 2, x->x_at);
      }
    }
  }
}

static void bin_ambi_reduced_decode_fft2_ambi_weight(t_bin_ambi_reduced_decode_fft2 *x, t_symbol *s, int argc, t_atom *argv)
{
  if(argc > x->x_n_order)
  {
    int i, k=0, n=x->x_n_order;
    double d;

    x->x_ambi_channel_weight[k] = (double)atom_getfloat(argv++);
    k++;
    if(x->x_n_dim == 2)
    {
      for(i=1; i<=n; i++)
      {
        d = (double)atom_getfloat(argv++);
        x->x_ambi_channel_weight[k] = d;
        k++;
        x->x_ambi_channel_weight[k] = d;
        k++;
      }
    }
    else
    {
      int j, m;

      for(i=1; i<=n; i++)
      {
        d = (double)atom_getfloat(argv++);
        m = 2*i + 1;
        for(j=0; j<m; j++)
        {
          x->x_ambi_channel_weight[k] = d;
          k++;
        }
      }
    }
  }
  else
    post("bin_ambi_reduced_decode_fft2-ERROR: ambi_weight needs %d float weights", x->x_n_order+1);
}

static void bin_ambi_reduced_decode_fft2_sing_range(t_bin_ambi_reduced_decode_fft2 *x, t_floatarg f)
{
  if(f < 0.0f)
    x->x_sing_range = -(double)f;
  else
    x->x_sing_range = (double)f;
}

static void bin_ambi_reduced_decode_fft2_free(t_bin_ambi_reduced_decode_fft2 *x)
{
  freebytes(x->x_hrir_filename, x->x_n_real_ls * sizeof(t_symbol *));
  freebytes(x->x_s_hrir, x->x_n_real_ls * sizeof(t_symbol *));
  freebytes(x->x_s_hrtf_re, x->x_n_ambi * sizeof(t_symbol *));
  freebytes(x->x_s_hrtf_im, x->x_n_ambi * sizeof(t_symbol *));
  freebytes(x->x_inv_work1, x->x_n_ambi * x->x_n_ambi * sizeof(double));
  freebytes(x->x_inv_work2, 2 * x->x_n_ambi * x->x_n_ambi * sizeof(double));
  freebytes(x->x_inv_buf2, 2 * x->x_n_ambi * sizeof(double));
  freebytes(x->x_transp, (x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
  freebytes(x->x_ls_encode, (x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
  freebytes(x->x_prod2, (x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
  freebytes(x->x_prod3, x->x_n_real_ls * x->x_n_ambi * sizeof(double));
  freebytes(x->x_ambi_channel_weight, x->x_n_ambi * sizeof(double));

  freebytes(x->x_delta, (x->x_n_real_ls+x->x_n_pht_ls) * sizeof(int));
  freebytes(x->x_phi, (x->x_n_real_ls+x->x_n_pht_ls) * sizeof(int));
  freebytes(x->x_phi_sym, x->x_n_real_ls * sizeof(int));
  freebytes(x->x_sym_flag, x->x_n_real_ls * sizeof(int));

  freebytes(x->x_spec, x->x_fftsize * sizeof(BIN_AMBI_COMPLEX));
  freebytes(x->x_sin_cos, x->x_fftsize * sizeof(BIN_AMBI_COMPLEX));

  freebytes(x->x_beg_hrir, x->x_fftsize * x->x_n_real_ls * sizeof(t_float));
  freebytes(x->x_beg_hrtf_re, x->x_n_ambi * sizeof(iemarray_t *));
  freebytes(x->x_beg_hrtf_im, x->x_n_ambi * sizeof(iemarray_t *));
}

/*
1.arg_ int prefix;
2.arg: t_symbol *hrir_name;
3.arg: t_symbol *hrtf_re_name;
4.arg: t_symbol *hrtf_im_name;
5.arg: t_symbol *hrir_fade_out_name;
6.arg: int ambi_order;
7.arg: int dim;
8.arg: int number_of_loudspeakers;
9.arg: int fftsize;
*/

static void *bin_ambi_reduced_decode_fft2_new(t_symbol *s, int argc, t_atom *argv)
{
  t_bin_ambi_reduced_decode_fft2 *x = (t_bin_ambi_reduced_decode_fft2 *)pd_new(bin_ambi_reduced_decode_fft2_class);
  char buf[400];
  int i, j, fftok, ok=0;
  int n_order=0, n_dim=0, n_real_ls=0, n_pht_ls=0, n_ambi=0, fftsize=0, prefix=0;
  t_symbol  *s_hrir=gensym("L_HRIR");
  t_symbol  *s_hrtf_re=gensym("HRTF_re");
  t_symbol  *s_hrtf_im=gensym("HRTF_im");
  t_symbol  *s_fade_out_hrir=gensym("HRIR_win");

  if((argc >= 10) &&
    IS_A_FLOAT(argv,0) &&
    IS_A_SYMBOL(argv,1) &&
    IS_A_SYMBOL(argv,2) &&
    IS_A_SYMBOL(argv,3) &&
    IS_A_SYMBOL(argv,4) &&
    IS_A_FLOAT(argv,5) &&
    IS_A_FLOAT(argv,6) &&
    IS_A_FLOAT(argv,7) &&
    IS_A_FLOAT(argv,8) &&
    IS_A_FLOAT(argv,9))
  {
    prefix  = (int)atom_getintarg(0, argc, argv);

    s_hrir                = (t_symbol *)atom_getsymbolarg(1, argc, argv);
    s_hrtf_re             = (t_symbol *)atom_getsymbolarg(2, argc, argv);
    s_hrtf_im             = (t_symbol *)atom_getsymbolarg(3, argc, argv);
    s_fade_out_hrir       = (t_symbol *)atom_getsymbolarg(4, argc, argv);

    n_order   = (int)atom_getintarg(5, argc, argv);
    n_dim     = (int)atom_getintarg(6, argc, argv);
    n_real_ls = (int)atom_getintarg(7, argc, argv);
    n_pht_ls    = (int)atom_getintarg(8, argc, argv);
    fftsize = (int)atom_getintarg(9, argc, argv);

    ok = 1;
  }
  else if((argc >= 10) &&
    IS_A_FLOAT(argv,0) &&
    IS_A_FLOAT(argv,1) &&
    IS_A_FLOAT(argv,2) &&
    IS_A_FLOAT(argv,3) &&
    IS_A_FLOAT(argv,4) &&
    IS_A_FLOAT(argv,5) &&
    IS_A_FLOAT(argv,6) &&
    IS_A_FLOAT(argv,7) &&
    IS_A_FLOAT(argv,8) &&
    IS_A_FLOAT(argv,9))
  {
    prefix  = (int)atom_getintarg(0, argc, argv);

    s_hrir                = gensym("L_HRIR");
    s_hrtf_re             = gensym("HRTF_re");
    s_hrtf_im             = gensym("HRTF_im");
    s_fade_out_hrir       = gensym("HRIR_win");

    n_order = (int)atom_getintarg(5, argc, argv);
    n_dim   = (int)atom_getintarg(6, argc, argv);
    n_real_ls = (int)atom_getintarg(7, argc, argv);
    n_pht_ls    = (int)atom_getintarg(8, argc, argv);
    fftsize = (int)atom_getintarg(9, argc, argv);

    ok = 1;
  }

  if(ok)
  {
    if(n_order < 1)
      n_order = 1;

    if(n_dim == 3)
    {
      if(n_order > 5)
        n_order = 5;
      n_ambi = (n_order + 1)*(n_order + 1);
    }
    else
    {
      if(n_order > 12)
        n_order = 12;
      n_dim = 2;
      n_ambi = 2 * n_order + 1;
    }

    if(n_real_ls < 1)
      n_real_ls = 1;
    if(n_pht_ls < 0)
      n_pht_ls = 0;

    if((n_real_ls+n_pht_ls) < n_ambi)
    {
      post("bin_ambi_reduced_decode_fft2-WARNING: Number of all Loudspeakers < Number of Ambisonic-Channels !!!!");
    }

    j = 2;
    fftok = 0;
    for(i=0; i<21; i++)
    {
      if(j == fftsize)
      {
        fftok = 1;
        i = 22;
      }
      j *= 2;
    }

    if(!fftok)
    {
      fftsize = 512;
      post("bin_ambi_reduced_decode_fft2-WARNING: fftsize not equal to 2 ^ n !!!");
      post("                                     fftsize set to %d", fftsize);
    }

    x->x_n_dim      = n_dim;
    x->x_n_ambi     = n_ambi;
    x->x_n_real_ls  = n_real_ls;
    x->x_n_pht_ls   = n_pht_ls;
    x->x_n_order    = n_order;
    x->x_fftsize    = fftsize;

    x->x_hrir_filename  = (t_symbol **)getbytes(x->x_n_real_ls * sizeof(t_symbol *));
    x->x_s_hrir         = (t_symbol **)getbytes(x->x_n_real_ls * sizeof(t_symbol *));
    x->x_s_hrtf_re      = (t_symbol **)getbytes(x->x_n_ambi * sizeof(t_symbol *));
    x->x_s_hrtf_im      = (t_symbol **)getbytes(x->x_n_ambi * sizeof(t_symbol *));

    j = x->x_n_real_ls;
    for(i=0; i<j; i++)
    {
      sprintf(buf, "%d_%d_%s", prefix, i+1, s_hrir->s_name);
      x->x_s_hrir[i] = gensym(buf);
    }

    for(i=0; i<n_ambi; i++)
    {
      sprintf(buf, "%d_%d_%s", prefix, i+1, s_hrtf_re->s_name);
      x->x_s_hrtf_re[i] = gensym(buf);

      sprintf(buf, "%d_%d_%s", prefix, i+1, s_hrtf_im->s_name);
      x->x_s_hrtf_im[i] = gensym(buf);
    }

    sprintf(buf, "%d_%s", prefix, s_fade_out_hrir->s_name);
    x->x_s_fade_out_hrir = gensym(buf);

    x->x_inv_work1  = (double *)getbytes(x->x_n_ambi * x->x_n_ambi * sizeof(double));
    x->x_inv_work2  = (double *)getbytes(2 * x->x_n_ambi * x->x_n_ambi * sizeof(double));
    x->x_inv_buf2   = (double *)getbytes(2 * x->x_n_ambi * sizeof(double));
    x->x_transp     = (double *)getbytes((x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
    x->x_ls_encode  = (double *)getbytes((x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
    x->x_prod2      = (double *)getbytes((x->x_n_real_ls+x->x_n_pht_ls) * x->x_n_ambi * sizeof(double));
    x->x_prod3      = (double *)getbytes(x->x_n_real_ls * x->x_n_ambi * sizeof(double));
    x->x_ambi_channel_weight = (double *)getbytes(x->x_n_ambi * sizeof(double));

    x->x_delta      = (int *)getbytes((x->x_n_real_ls+x->x_n_pht_ls) * sizeof(int));
    x->x_phi        = (int *)getbytes((x->x_n_real_ls+x->x_n_pht_ls) * sizeof(int));
    x->x_phi_sym    = (int *)getbytes(x->x_n_real_ls * sizeof(int));
    x->x_sym_flag   = (int *)getbytes(x->x_n_real_ls * sizeof(int));

    x->x_spec       = (BIN_AMBI_COMPLEX *)getbytes(x->x_fftsize * sizeof(BIN_AMBI_COMPLEX));
    x->x_sin_cos    = (BIN_AMBI_COMPLEX *)getbytes(x->x_fftsize * sizeof(BIN_AMBI_COMPLEX));

    x->x_beg_fade_out_hrir  = 0;
    x->x_beg_hrir           = (t_float *)getbytes(x->x_fftsize * x->x_n_real_ls * sizeof(t_float));
    x->x_beg_hrtf_re        = (iemarray_t **)getbytes(x->x_n_ambi * sizeof(iemarray_t *));
    x->x_beg_hrtf_im        = (iemarray_t **)getbytes(x->x_n_ambi * sizeof(iemarray_t *));

    x->x_sqrt3        = sqrt(3.0);
    x->x_sqrt5_2      = sqrt(5.0) / 2.0;
    x->x_sqrt6_4      = sqrt(6.0) / 4.0;
    x->x_sqrt10_4     = sqrt(10.0) / 4.0;
    x->x_sqrt15_2     = sqrt(15.0) / 2.0;
    x->x_sqrt35_8     = sqrt(35.0) / 8.0;
    x->x_sqrt70_4     = sqrt(70.0) / 4.0;
    x->x_sqrt126_16   = sqrt(126.0) / 16.0;
    x->x_sqrt315_8    = sqrt(315.0) / 8.0;
    x->x_sqrt105_4    = sqrt(105.0) / 4.0;
    x->x_pi_over_180  = 4.0 * atan(1.0) / 180.0;
    x->x_sing_range = 1.0e-10;
    x->x_seq_ok = 1;
    for(i=0; i<n_ambi; i++)
      x->x_ambi_channel_weight[i] = 1.0;

    bin_ambi_reduced_decode_fft2_init_cos(x);

    outlet_new(&x->x_obj, &s_list);
    x->x_out_sign_sum = outlet_new(&x->x_obj, &s_list);
    return(x);
  }
  else
  {
    post("bin_ambi_reduced_decode_fft2-ERROR: need 1 float + 4 symbols + 5 floats arguments:");
    post("  prefix(unique-number) + hrir_name + hrtf_re_name + hrtf_im_name + hrir_fade_out_name +");
    post("   + ambi_order + ambi_dimension + number_of_real_loudspeakers + ");
    post("   + number_of_phantom_loudspeakers + fftsize");
    return(0);
  }
}

void bin_ambi_reduced_decode_fft2_setup(void)
{
  bin_ambi_reduced_decode_fft2_class = class_new(gensym("bin_ambi_reduced_decode_fft2"), (t_newmethod)bin_ambi_reduced_decode_fft2_new, (t_method)bin_ambi_reduced_decode_fft2_free,
    sizeof(t_bin_ambi_reduced_decode_fft2), 0, A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_real_ls, gensym("real_ls"), A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_pht_ls, gensym("pht_ls"), A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_calc_pinv, gensym("calc_pinv"), 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_ipht_ireal_muladd, gensym("ipht_ireal_muladd"), A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_load_HRIR, gensym("load_HRIR"), A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_check_HRIR_arrays, gensym("check_HRIR_arrays"), A_FLOAT, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_check_HRTF_arrays, gensym("check_HRTF_arrays"), A_FLOAT, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_calc_reduced, gensym("calc_reduced"), A_FLOAT, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_calc_sym, gensym("calc_sym"), 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_ambi_weight, gensym("ambi_weight"), A_GIMME, 0);
  class_addmethod(bin_ambi_reduced_decode_fft2_class, (t_method)bin_ambi_reduced_decode_fft2_sing_range, gensym("sing_range"), A_DEFFLOAT, 0);
//  class_sethelpsymbol(bin_ambi_reduced_decode_fft2_class, gensym("iemhelp2/bin_ambi_reduced_decode_fft2-help"));
}
/*
Reihenfolge:
n_re_ls x bin_ambi_reduced_decode_fft2_real_ls

  n_im_ls x bin_ambi_reduced_decode_fft2_pht_ls

    n_re_ls x bin_ambi_reduced_decode_fft2_load_HRIR

      1 x bin_ambi_reduced_decode_fft2_calc_pinv

        n_mir x bin_ambi_reduced_decode_fft2_ipht_ireal_muladd

          n_re_ls x bin_ambi_reduced_decode_fft2_check_HRIR_arrays

            n_ambi x bin_ambi_reduced_decode_fft2_check_HRTF_arrays

              n_ambi x bin_ambi_reduced_decode_fft2_calc_reduced

                bin_ambi_reduced_decode_fft2_calc_sym

*/
