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libavcodec/rdft.h

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00001 /*
00002  * (I)RDFT transforms
00003  * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #ifndef AVCODEC_RDFT_H
00023 #define AVCODEC_RDFT_H
00024 
00025 #include "config.h"
00026 #include "fft.h"
00027 
00028 #if CONFIG_HARDCODED_TABLES
00029 #   define SINTABLE_CONST const
00030 #else
00031 #   define SINTABLE_CONST
00032 #endif
00033 
00034 #define SINTABLE(size) \
00035     SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
00036 
00037 extern SINTABLE(16);
00038 extern SINTABLE(32);
00039 extern SINTABLE(64);
00040 extern SINTABLE(128);
00041 extern SINTABLE(256);
00042 extern SINTABLE(512);
00043 extern SINTABLE(1024);
00044 extern SINTABLE(2048);
00045 extern SINTABLE(4096);
00046 extern SINTABLE(8192);
00047 extern SINTABLE(16384);
00048 extern SINTABLE(32768);
00049 extern SINTABLE(65536);
00050 
00051 struct RDFTContext {
00052     int nbits;
00053     int inverse;
00054     int sign_convention;
00055 
00056     /* pre/post rotation tables */
00057     const FFTSample *tcos;
00058     SINTABLE_CONST FFTSample *tsin;
00059     FFTContext fft;
00060     void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
00061 };
00062 
00068 int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
00069 void ff_rdft_end(RDFTContext *s);
00070 
00071 void ff_rdft_init_arm(RDFTContext *s);
00072 
00073 
00074 #endif /* AVCODEC_RDFT_H */
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