1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * (I)RDFT transforms 3cabdff1aSopenharmony_ci * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com> 4cabdff1aSopenharmony_ci * 5cabdff1aSopenharmony_ci * This file is part of FFmpeg. 6cabdff1aSopenharmony_ci * 7cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 8cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 9cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 10cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 11cabdff1aSopenharmony_ci * 12cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 13cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 14cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15cabdff1aSopenharmony_ci * Lesser General Public License for more details. 16cabdff1aSopenharmony_ci * 17cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 18cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 19cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20cabdff1aSopenharmony_ci */ 21cabdff1aSopenharmony_ci 22cabdff1aSopenharmony_ci#if !defined(AVCODEC_RDFT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT) 23cabdff1aSopenharmony_ci#define AVCODEC_RDFT_H 24cabdff1aSopenharmony_ci 25cabdff1aSopenharmony_ci#include "config.h" 26cabdff1aSopenharmony_ci#include "fft.h" 27cabdff1aSopenharmony_ci 28cabdff1aSopenharmony_cistruct RDFTContext { 29cabdff1aSopenharmony_ci int nbits; 30cabdff1aSopenharmony_ci int inverse; 31cabdff1aSopenharmony_ci int sign_convention; 32cabdff1aSopenharmony_ci 33cabdff1aSopenharmony_ci /* pre/post rotation tables */ 34cabdff1aSopenharmony_ci const FFTSample *tcos; 35cabdff1aSopenharmony_ci const FFTSample *tsin; 36cabdff1aSopenharmony_ci int negative_sin; 37cabdff1aSopenharmony_ci FFTContext fft; 38cabdff1aSopenharmony_ci void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); 39cabdff1aSopenharmony_ci}; 40cabdff1aSopenharmony_ci 41cabdff1aSopenharmony_ci/** 42cabdff1aSopenharmony_ci * Set up a real FFT. 43cabdff1aSopenharmony_ci * @param nbits log2 of the length of the input array 44cabdff1aSopenharmony_ci * @param trans the type of transform 45cabdff1aSopenharmony_ci */ 46cabdff1aSopenharmony_ciint ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); 47cabdff1aSopenharmony_civoid ff_rdft_end(RDFTContext *s); 48cabdff1aSopenharmony_ci 49cabdff1aSopenharmony_civoid ff_rdft_init_arm(RDFTContext *s); 50cabdff1aSopenharmony_ci 51cabdff1aSopenharmony_ci 52cabdff1aSopenharmony_ci#endif /* AVCODEC_RDFT_H */ 53