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dct.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 eos' (I)RDFT code which is in turn
00024 // Based upon the (I)DCT code in FFmpeg
00025 // Copyright (c) 2009 Peter Ross <pross@xvid.org>
00026 // Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
00027 // Copyright (c) 2010 Vitor Sessak
00028 
00029 #ifndef COMMON_DCT_H
00030 #define COMMON_DCT_H
00031 
00032 #include "common/scummsys.h"
00033 #include "common/math.h"
00034 #include "common/rdft.h"
00035 
00036 #include "common/cosinetables.h"
00037 
00038 namespace Common {
00039 
00046 class DCT {
00047 public:
00048     enum TransformType {
00049         DCT_II,
00050         DCT_III,
00051         DCT_I,
00052         DST_I
00053     };
00054 
00055     DCT(int bits, TransformType trans);
00056     ~DCT();
00057 
00058     void calc(float *data);
00059 
00060 private:
00061     int _bits;
00062     TransformType _trans;
00063 
00064     CosineTable _cos;
00065     const float *_tCos;
00066 
00067     float *_csc2;
00068 
00069     RDFT *_rdft;
00070 
00071     void calcDCTI  (float *data);
00072     void calcDCTII (float *data);
00073     void calcDCTIII(float *data);
00074     void calcDSTI  (float *data);
00075 };
00076 
00077 } // End of namespace Common
00078 
00079 #endif // COMMON_DCT_H


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