dct/fft: Give consistent names to fixed/float template files
[libav.git] / libavcodec / mdct_fixed.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #define CONFIG_FFT_FLOAT 0
20 #include "mdct_template.c"
21
22 /* same as ff_mdct_calcw_c with double-width unscaled output */
23 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *out, const FFTSample *input)
24 {
25 int i, j, n, n8, n4, n2, n3;
26 FFTDouble re, im;
27 const uint16_t *revtab = s->revtab;
28 const FFTSample *tcos = s->tcos;
29 const FFTSample *tsin = s->tsin;
30 FFTComplex *x = s->tmp_buf;
31 FFTDComplex *o = (FFTDComplex *)out;
32
33 n = 1 << s->mdct_bits;
34 n2 = n >> 1;
35 n4 = n >> 2;
36 n8 = n >> 3;
37 n3 = 3 * n4;
38
39 /* pre rotation */
40 for(i=0;i<n8;i++) {
41 re = RSCALE(-input[2*i+n3] - input[n3-1-2*i]);
42 im = RSCALE(-input[n4+2*i] + input[n4-1-2*i]);
43 j = revtab[i];
44 CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]);
45
46 re = RSCALE( input[2*i] - input[n2-1-2*i]);
47 im = RSCALE(-input[n2+2*i] - input[ n-1-2*i]);
48 j = revtab[n8 + i];
49 CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]);
50 }
51
52 s->fft_calc(s, x);
53
54 /* post rotation */
55 for(i=0;i<n8;i++) {
56 FFTDouble r0, i0, r1, i1;
57 CMULL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]);
58 CMULL(i0, r1, x[n8+i ].re, x[n8+i ].im, -tsin[n8+i ], -tcos[n8+i ]);
59 o[n8-i-1].re = r0;
60 o[n8-i-1].im = i0;
61 o[n8+i ].re = r1;
62 o[n8+i ].im = i1;
63 }
64 }