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/*
* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
*
* 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.
*
*/
#ifndef _dsp_filter_h_
#define _dsp_filter_h_
#include <stdint.h>
#include "ardour/libardour_visibility.h"
namespace ARDOUR { namespace DSP {
void memset (float *data, const float val, const uint32_t n_samples);
void mmult (float *data, float *mult, const uint32_t n_samples);
class LIBARDOUR_API LowPass {
public:
LowPass (double samplerate, float freq);
void proc (float *data, const uint32_t n_samples);
void ctrl (float *data, const float val, const uint32_t n_samples);
void set_cutoff (float freq);
void reset () { _z = 0.f; }
private:
float _rate;
float _z;
float _a;
};
class LIBARDOUR_API BiQuad {
public:
enum Type {
LowPass,
HighPass,
BandPassSkirt,
BandPass0dB,
Notch,
AllPass,
Peaking,
LowShelf,
HighShelf
};
BiQuad (double samplerate);
BiQuad (const BiQuad &other);
void run (float *data, const uint32_t n_samples);
void compute (Type, double freq, double Q, double gain);
void reset () { _z1 = _z2 = 0.0; }
private:
double _rate;
float _z1, _z2;
double _a1, _a2;
double _b0, _b1, _b2;
};
} } /* namespace */
#endif
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