/*

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #define FFT_FLOAT 0

 #define FFT_FIXED_32 0

 #include "mdct_template.c"

 
 /* same as ff_mdct_calcw_c with double-width unscaled output */
 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *out, const FFTSample *input)
 {
     int i, j, n, n8, n4, n2, n3;
     FFTDouble re, im;
     const uint16_t *revtab = s->revtab;
     const FFTSample *tcos = s->tcos;
     const FFTSample *tsin = s->tsin;
     FFTComplex *x = s->tmp_buf;
     FFTDComplex *o = (FFTDComplex *)out;
 
     n = 1 << s->mdct_bits;
     n2 = n >> 1;
     n4 = n >> 2;
     n8 = n >> 3;
     n3 = 3 * n4;
 
     /* pre rotation */
     for(i=0;i<n8;i++) {

         re = RSCALE(-input[2*i+n3], - input[n3-1-2*i]);
         im = RSCALE(-input[n4+2*i], + input[n4-1-2*i]);

         j = revtab[i];
         CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]);
 

         re = RSCALE( input[2*i]   , - input[n2-1-2*i]);
         im = RSCALE(-input[n2+2*i], - input[ n-1-2*i]);

         j = revtab[n8 + i];
         CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]);
     }
 
     s->fft_calc(s, x);
 
     /* post rotation */
     for(i=0;i<n8;i++) {
         FFTDouble r0, i0, r1, i1;
         CMULL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]);
         CMULL(i0, r1, x[n8+i  ].re, x[n8+i  ].im, -tsin[n8+i  ], -tcos[n8+i  ]);
         o[n8-i-1].re = r0;
         o[n8-i-1].im = i0;
         o[n8+i  ].re = r1;
         o[n8+i  ].im = i1;
     }
 }