repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * (I)RDFT transforms | |
| 3 | * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com> | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | #if !defined(AVCODEC_RDFT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT) | |
| 23 | #define AVCODEC_RDFT_H | |
| 24 | ||
| 25 | #include "config.h" | |
| 26 | #include "fft.h" | |
| 27 | ||
| 28 | #if CONFIG_HARDCODED_TABLES | |
| 29 | # define SINTABLE_CONST const | |
| 30 | #else | |
| 31 | # define SINTABLE_CONST | |
| 32 | #endif | |
| 33 | ||
| 34 | #define SINTABLE(size) \ | |
| 35 | SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] | |
| 36 | ||
| 37 | extern SINTABLE(16); | |
| 38 | extern SINTABLE(32); | |
| 39 | extern SINTABLE(64); | |
| 40 | extern SINTABLE(128); | |
| 41 | extern SINTABLE(256); | |
| 42 | extern SINTABLE(512); | |
| 43 | extern SINTABLE(1024); | |
| 44 | extern SINTABLE(2048); | |
| 45 | extern SINTABLE(4096); | |
| 46 | extern SINTABLE(8192); | |
| 47 | extern SINTABLE(16384); | |
| 48 | extern SINTABLE(32768); | |
| 49 | extern SINTABLE(65536); | |
| 50 | ||
| 51 | struct RDFTContext { | |
| 52 | int nbits; | |
| 53 | int inverse; | |
| 54 | int sign_convention; | |
| 55 | ||
| 56 | /* pre/post rotation tables */ | |
| 57 | const FFTSample *tcos; | |
| 58 | SINTABLE_CONST FFTSample *tsin; | |
| 59 | FFTContext fft; | |
| 60 | void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); | |
| 61 | }; | |
| 62 | ||
| 63 | /** | |
| 64 | * Set up a real FFT. | |
| 65 | * @param nbits log2 of the length of the input array | |
| 66 | * @param trans the type of transform | |
| 67 | */ | |
| 68 | int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); | |
| 69 | void ff_rdft_end(RDFTContext *s); | |
| 70 | ||
| 71 | void ff_rdft_init_arm(RDFTContext *s); | |
| 72 | ||
| 73 | ||
| 74 | #endif /* AVCODEC_RDFT_H */ |