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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * (I)RDFT transforms |
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| 3 | * Copyright (c) 2009 Alex Converse |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #ifndef AVCODEC_RDFT_H |
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| 23 | #define AVCODEC_RDFT_H |
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| 24 | |||
| 25 | #include "config.h" |
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| 26 | #include "fft.h" |
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| 27 | |||
| 28 | #if CONFIG_HARDCODED_TABLES |
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| 29 | # define SINTABLE_CONST const |
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| 30 | #else |
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| 31 | # define SINTABLE_CONST |
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| 32 | #endif |
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| 33 | |||
| 34 | #define SINTABLE(size) \ |
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| 35 | SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] |
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| 36 | |||
| 37 | extern SINTABLE(16); |
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| 38 | extern SINTABLE(32); |
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| 39 | extern SINTABLE(64); |
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| 40 | extern SINTABLE(128); |
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| 41 | extern SINTABLE(256); |
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| 42 | extern SINTABLE(512); |
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| 43 | extern SINTABLE(1024); |
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| 44 | extern SINTABLE(2048); |
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| 45 | extern SINTABLE(4096); |
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| 46 | extern SINTABLE(8192); |
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| 47 | extern SINTABLE(16384); |
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| 48 | extern SINTABLE(32768); |
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| 49 | extern SINTABLE(65536); |
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| 50 | |||
| 51 | struct RDFTContext { |
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| 52 | int nbits; |
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| 53 | int inverse; |
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| 54 | int sign_convention; |
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| 55 | |||
| 56 | /* pre/post rotation tables */ |
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| 57 | const FFTSample *tcos; |
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| 58 | SINTABLE_CONST FFTSample *tsin; |
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| 59 | FFTContext fft; |
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| 60 | void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); |
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| 61 | }; |
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| 62 | |||
| 63 | /** |
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| 64 | * Set up a real FFT. |
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| 65 | * @param nbits log2 of the length of the input array |
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| 66 | * @param trans the type of transform |
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| 67 | */ |
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| 68 | int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); |
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| 69 | void ff_rdft_end(RDFTContext *s); |
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| 70 | |||
| 71 | void ff_rdft_init_arm(RDFTContext *s); |
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| 72 | |||
| 73 | |||
| 74 | #endif /* AVCODEC_RDFT_H */ |