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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * This file is part of FFmpeg. |
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| 3 | * |
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| 4 | * FFmpeg is free software; you can redistribute it and/or |
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| 5 | * modify it under the terms of the GNU Lesser General Public |
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| 6 | * License as published by the Free Software Foundation; either |
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| 7 | * version 2.1 of the License, or (at your option) any later version. |
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| 8 | * |
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| 9 | * FFmpeg is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | * Lesser General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU Lesser General Public |
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| 15 | * License along with FFmpeg; if not, write to the Free Software |
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| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 17 | */ |
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| 18 | |||
| 19 | #define CONFIG_FFT_FLOAT 0 |
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| 20 | #define CONFIG_FFT_FIXED_32 0 |
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| 21 | #include "mdct.c" |
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| 22 | |||
| 23 | /* same as ff_mdct_calcw_c with double-width unscaled output */ |
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| 24 | void ff_mdct_calcw_c(FFTContext *s, FFTDouble *out, const FFTSample *input) |
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| 25 | { |
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| 26 | int i, j, n, n8, n4, n2, n3; |
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| 27 | FFTDouble re, im; |
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| 28 | const uint16_t *revtab = s->revtab; |
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| 29 | const FFTSample *tcos = s->tcos; |
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| 30 | const FFTSample *tsin = s->tsin; |
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| 31 | FFTComplex *x = s->tmp_buf; |
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| 32 | FFTDComplex *o = (FFTDComplex *)out; |
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| 33 | |||
| 34 | n = 1 << s->mdct_bits; |
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| 35 | n2 = n >> 1; |
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| 36 | n4 = n >> 2; |
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| 37 | n8 = n >> 3; |
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| 38 | n3 = 3 * n4; |
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| 39 | |||
| 40 | /* pre rotation */ |
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| 41 | for(i=0;i |
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| 42 | re = RSCALE(-input[2*i+n3] - input[n3-1-2*i]); |
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| 43 | im = RSCALE(-input[n4+2*i] + input[n4-1-2*i]); |
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| 44 | j = revtab[i]; |
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| 45 | CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]); |
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| 46 | |||
| 47 | re = RSCALE( input[2*i] - input[n2-1-2*i]); |
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| 48 | im = RSCALE(-input[n2+2*i] - input[ n-1-2*i]); |
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| 49 | j = revtab[n8 + i]; |
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| 50 | CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]); |
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| 51 | } |
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| 52 | |||
| 53 | s->fft_calc(s, x); |
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| 54 | |||
| 55 | /* post rotation */ |
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| 56 | for(i=0;i |
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| 57 | FFTDouble r0, i0, r1, i1; |
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| 58 | CMULL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]); |
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| 59 | CMULL(i0, r1, x[n8+i ].re, x[n8+i ].im, -tsin[n8+i ], -tcos[n8+i ]); |
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| 60 | o[n8-i-1].re = r0; |
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| 61 | o[n8-i-1].im = i0; |
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| 62 | o[n8+i ].re = r1; |
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| 63 | o[n8+i ].im = i1; |
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| 64 | } |
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| 65 | } |