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mdct.h

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00001 /* ResidualVM - A 3D game interpreter
00002  *
00003  * ResidualVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the AUTHORS
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)MDCT code in FFmpeg
00025 // Copyright (c) 2002 Fabrice Bellard
00026 
00027 
00028 #ifndef COMMON_MDCT_H
00029 #define COMMON_MDCT_H
00030 
00031 #include "common/types.h"
00032 
00033 namespace Common {
00034 
00035 class FFT;
00036 
00038 class MDCT {
00039 public:
00040     MDCT(int bits, bool inverse, double scale);
00041     ~MDCT();
00042 
00044     void calcMDCT(float *output, const float *input);
00045 
00047     void calcIMDCT(float *output, const float *input);
00048 
00049 private:
00050     int _bits;
00051     int _size;
00052 
00053     float *_tCos;
00054     float *_tSin;
00055 
00056     FFT *_fft;
00057 
00061     void calcHalfIMDCT(float *output, const float *input);
00062 };
00063 
00064 } // End of namespace Common
00065 
00066 #endif // COMMON_MDCT_H


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