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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// Based on eos' (I)RDFT code which is in turn
// Based upon the (I)DCT code in FFmpeg
// Copyright (c) 2009 Peter Ross <pross@xvid.org>
// Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
// Copyright (c) 2010 Vitor Sessak
#ifndef MATH_DCT_H
#define MATH_DCT_H
#include "math/cosinetables.h"
namespace Math {
class RDFT;
/**
* @defgroup math_dct Discrete Cosine Transforms
* @ingroup math
*
* @brief Discrete Cosine Transforms.
*
* @{
*/
/**
* (Inverse) Discrete Cosine Transforms.
*
* Used in engines:
* - Scumm
*/
class DCT {
public:
enum TransformType {
DCT_II,
DCT_III,
DCT_I,
DST_I
};
DCT(int bits, TransformType trans);
~DCT();
void calc(float *data);
private:
int _bits;
TransformType _trans;
CosineTable _cos;
const float *_tCos;
float *_csc2;
RDFT *_rdft;
void calcDCTI (float *data);
void calcDCTII (float *data);
void calcDCTIII(float *data);
void calcDSTI (float *data);
};
/** @} */
} // End of namespace Math
#endif // MATH_DCT_H
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