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66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// Based on xoreos' (I)RDFT code which is in turn
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// Based upon the (I)MDCT code in FFmpeg
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// Copyright (c) 2002 Fabrice Bellard
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#ifndef MATH_MDCT_H
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#define MATH_MDCT_H
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#include "common/scummsys.h"
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namespace Math {
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class FFT;
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/** (Inverse) Modified Discrete Cosine Transforms. */
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class MDCT {
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public:
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MDCT(int bits, bool inverse, double scale);
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~MDCT();
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/** Compute MDCT of size N = 2^nbits. */
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void calcMDCT(float *output, const float *input);
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/** Compute inverse MDCT of size N = 2^nbits. */
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void calcIMDCT(float *output, const float *input);
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private:
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int _bits;
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int _size;
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float *_tCos;
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float *_tSin;
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FFT *_fft;
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/** Compute the middle half of the inverse MDCT of size N = 2^nbits,
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* thus excluding the parts that can be derived by symmetry.
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*/
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void calcHalfIMDCT(float *output, const float *input);
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};
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} // End of namespace Math
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#endif // MATH_MDCT_H
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