/* * (I)RDFT transforms * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #if !defined(AVCODEC_RDFT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT) #define AVCODEC_RDFT_H #include "config.h" #include "fft.h" struct RDFTContext { int nbits; int inverse; int sign_convention; /* pre/post rotation tables */ const FFTSample *tcos; const FFTSample *tsin; int negative_sin; FFTContext fft; void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); }; /** * Set up a real FFT. * @param nbits log2 of the length of the input array * @param trans the type of transform */ int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); void ff_rdft_end(RDFTContext *s); void ff_rdft_init_arm(RDFTContext *s); #endif /* AVCODEC_RDFT_H */