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rdft.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program 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
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 // Based on xoreos' (I)RDFT code which is in turn
00024 // Based upon the (I)RDFT code in FFmpeg
00025 // Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
00026 
00027 #ifndef COMMON_RDFT_H
00028 #define COMMON_RDFT_H
00029 
00030 #include "common/scummsys.h"
00031 #include "common/math.h"
00032 #include "common/fft.h"
00033 
00034 #include "common/cosinetables.h"
00035 #include "common/sinetables.h"
00036 
00037 namespace Common {
00038 
00083 class RDFT {
00084 public:
00085     enum TransformType {
00086         DFT_R2C,
00087         IDFT_C2R,
00088         IDFT_R2C,
00089         DFT_C2R
00090     };
00091 
00092     RDFT(int bits, TransformType trans);
00093     ~RDFT();
00094 
00095     void calc(float *data);
00096 
00097 private:
00098     int _bits;
00099     int _inverse;
00100     int _signConvention;
00101 
00102     SineTable _sin;
00103     CosineTable _cos;
00104     const float *_tSin;
00105     const float *_tCos;
00106 
00107     FFT *_fft;
00108 };
00109 
00110 } // End of namespace Common
00111 
00112 #endif // COMMON_RDFT_H


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