mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 18:24:59 +00:00
71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
/* 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 2
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
// Based on eos' (I)RDFT code which is in turn
|
|
// Based upon the (I)RDFT code in FFmpeg
|
|
// Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
|
|
|
|
#ifndef COMMON_RDFT_H
|
|
#define COMMON_RDFT_H
|
|
|
|
#include "common/scummsys.h"
|
|
#include "common/math.h"
|
|
#include "common/fft.h"
|
|
|
|
namespace Common {
|
|
|
|
/**
|
|
* (Inverse) Real Discrete Fourier Transform.
|
|
*
|
|
* Used in engines:
|
|
* - scumm
|
|
*/
|
|
|
|
class RDFT {
|
|
public:
|
|
enum TransformType {
|
|
DFT_R2C,
|
|
IDFT_C2R,
|
|
IDFT_R2C,
|
|
DFT_C2R
|
|
};
|
|
|
|
RDFT(int bits, TransformType trans);
|
|
~RDFT();
|
|
|
|
void calc(float *data);
|
|
|
|
private:
|
|
int _bits;
|
|
int _inverse;
|
|
int _signConvention;
|
|
|
|
const float *_tSin;
|
|
const float *_tCos;
|
|
|
|
FFT *_fft;
|
|
};
|
|
|
|
} // End of namespace Common
|
|
|
|
#endif // COMMON_RDFT_H
|