yading@10: /*
yading@10:  * (I)RDFT transforms
yading@10:  * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_RDFT_H
yading@10: #define AVCODEC_RDFT_H
yading@10: 
yading@10: #include "config.h"
yading@10: #include "fft.h"
yading@10: 
yading@10: #if CONFIG_HARDCODED_TABLES
yading@10: #   define SINTABLE_CONST const
yading@10: #else
yading@10: #   define SINTABLE_CONST
yading@10: #endif
yading@10: 
yading@10: #define SINTABLE(size) \
yading@10:     SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
yading@10: 
yading@10: extern SINTABLE(16);
yading@10: extern SINTABLE(32);
yading@10: extern SINTABLE(64);
yading@10: extern SINTABLE(128);
yading@10: extern SINTABLE(256);
yading@10: extern SINTABLE(512);
yading@10: extern SINTABLE(1024);
yading@10: extern SINTABLE(2048);
yading@10: extern SINTABLE(4096);
yading@10: extern SINTABLE(8192);
yading@10: extern SINTABLE(16384);
yading@10: extern SINTABLE(32768);
yading@10: extern SINTABLE(65536);
yading@10: 
yading@10: struct RDFTContext {
yading@10:     int nbits;
yading@10:     int inverse;
yading@10:     int sign_convention;
yading@10: 
yading@10:     /* pre/post rotation tables */
yading@10:     const FFTSample *tcos;
yading@10:     SINTABLE_CONST FFTSample *tsin;
yading@10:     FFTContext fft;
yading@10:     void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Set up a real FFT.
yading@10:  * @param nbits           log2 of the length of the input array
yading@10:  * @param trans           the type of transform
yading@10:  */
yading@10: int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
yading@10: void ff_rdft_end(RDFTContext *s);
yading@10: 
yading@10: void ff_rdft_init_arm(RDFTContext *s);
yading@10: 
yading@10: 
yading@10: #endif /* AVCODEC_RDFT_H */