Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * This file is part of FFmpeg. | |
3 | * | |
4 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #define FFT_FLOAT 0 | |
20 | #define FFT_FIXED_32 0 | |
21 | #include "mdct_template.c" | |
22 | ||
23 | /* same as ff_mdct_calcw_c with double-width unscaled output */ | |
24 | void ff_mdct_calcw_c(FFTContext *s, FFTDouble *out, const FFTSample *input) | |
25 | { | |
26 | int i, j, n, n8, n4, n2, n3; | |
27 | FFTDouble re, im; | |
28 | const uint16_t *revtab = s->revtab; | |
29 | const FFTSample *tcos = s->tcos; | |
30 | const FFTSample *tsin = s->tsin; | |
31 | FFTComplex *x = s->tmp_buf; | |
32 | FFTDComplex *o = (FFTDComplex *)out; | |
33 | ||
34 | n = 1 << s->mdct_bits; | |
35 | n2 = n >> 1; | |
36 | n4 = n >> 2; | |
37 | n8 = n >> 3; | |
38 | n3 = 3 * n4; | |
39 | ||
40 | /* pre rotation */ | |
41 | for(i=0;i<n8;i++) { | |
42 | re = RSCALE(-input[2*i+n3] - input[n3-1-2*i]); | |
43 | im = RSCALE(-input[n4+2*i] + input[n4-1-2*i]); | |
44 | j = revtab[i]; | |
45 | CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]); | |
46 | ||
47 | re = RSCALE( input[2*i] - input[n2-1-2*i]); | |
48 | im = RSCALE(-input[n2+2*i] - input[ n-1-2*i]); | |
49 | j = revtab[n8 + i]; | |
50 | CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]); | |
51 | } | |
52 | ||
53 | s->fft_calc(s, x); | |
54 | ||
55 | /* post rotation */ | |
56 | for(i=0;i<n8;i++) { | |
57 | FFTDouble r0, i0, r1, i1; | |
58 | CMULL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]); | |
59 | CMULL(i0, r1, x[n8+i ].re, x[n8+i ].im, -tsin[n8+i ], -tcos[n8+i ]); | |
60 | o[n8-i-1].re = r0; | |
61 | o[n8-i-1].im = i0; | |
62 | o[n8+i ].re = r1; | |
63 | o[n8+i ].im = i1; | |
64 | } | |
65 | } |