/* 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 xoreos' (I)RDFT code which is in turn

// Based upon the (I)MDCT code in FFmpeg

// Copyright (c) 2002 Fabrice Bellard

#ifndef MATH_MDCT_H

#define MATH_MDCT_H

#include "common/scummsys.h"

namespace Math {

class FFT;

/** (Inverse) Modified Discrete Cosine Transforms. */

class MDCT {

public:

MDCT(int bits, bool inverse, double scale);

~MDCT();

/** Compute MDCT of size N = 2^nbits. */

void calcMDCT(float *output, const float *input);

/** Compute inverse MDCT of size N = 2^nbits. */

void calcIMDCT(float *output, const float *input);

private:

int _bits;

int _size;

float *_tCos;

float *_tSin;

FFT *_fft;

/** Compute the middle half of the inverse MDCT of size N = 2^nbits,

* thus excluding the parts that can be derived by symmetry.

*/

void calcHalfIMDCT(float *output, const float *input);

};

} // End of namespace Math

#endif // MATH_MDCT_H