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 27 #include "fft.h" 28 29 #if CONFIG_HARDCODED_TABLES 30 # define SINTABLE_CONST const 31 #else 32 # define SINTABLE_CONST 33 #endif 34 35 #define SINTABLE(size) \ 36 SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] 37 38 extern SINTABLE(16); 39 extern SINTABLE(32); 40 extern SINTABLE(64); 41 extern SINTABLE(128); 42 extern SINTABLE(256); 43 extern SINTABLE(512); 44 extern SINTABLE(1024); 45 extern SINTABLE(2048); 46 extern SINTABLE(4096); 47 extern SINTABLE(8192); 48 extern SINTABLE(16384); 49 extern SINTABLE(32768); 50 extern SINTABLE(65536); 51 52 struct RDFTContext { 53 int nbits; 54 int inverse; 55 int sign_convention; 56 57 /* pre/post rotation tables */ 58 const FFTSample *tcos; 59 SINTABLE_CONST FFTSample *tsin; 60 FFTContext fft; 61 void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); 62 }; 63 64 /** 65 * Set up a real FFT. 66 * @param nbits log2 of the length of the input array 67 * @param trans the type of transform 68 */ 69 int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); 70 void ff_rdft_end(RDFTContext *s); 71 72 void ff_rdft_init_arm(RDFTContext *s); 73 74 75 #endif /* AVCODEC_RDFT_H */ 76