func: static int eval_lpc_coeffs(const float *in, float *tgt, int n)
  
  {
  
      int x, y;
  
      double f0, f1, f2;
  
  
  
      if (in[n] == 0)
  
          return 0;
  
  
  
      if ((f0 = *in) <= 0)
  
          return 0;
  
  
  
      in--; // To avoid a -1 subtraction in the inner loop
  
  
  
      for (x=1; x <= n; x++) {
  
          f1 = in[x+1];
  
  
  
          for (y=0; y < x - 1; y++)
  
              f1 += in[x-y]*tgt[y];
  
  
  
          tgt[x-1] = f2 = -f1/f0;
  
          for (y=0; y < x >> 1; y++) {
  
              float temp = tgt[y] + tgt[x-y-2]*f2;
  
              tgt[x-y-2] += tgt[y]*f2;
  
              tgt[y] = temp;
  
          }
  
          if ((f0 += f1*f2) < 0)
  
              return 0;
  
      }
  
  
  
      return 1;
  
  }
  