forked from KolibriOS/kolibrios
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
|
|
* 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;
|
|
}
|
|
}
|