2 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #ifndef _dsp_filter_h_
20 #define _dsp_filter_h_
23 #include "ardour/libardour_visibility.h"
25 namespace ARDOUR { namespace DSP {
27 void memset (float *data, const float val, const uint32_t n_samples);
28 void mmult (float *data, float *mult, const uint32_t n_samples);
31 class LIBARDOUR_API LowPass {
33 LowPass (double samplerate, float freq);
34 void proc (float *data, const uint32_t n_samples);
35 void ctrl (float *data, const float val, const uint32_t n_samples);
36 void set_cutoff (float freq);
37 void reset () { _z = 0.f; }
44 class LIBARDOUR_API BiQuad {
58 BiQuad (double samplerate);
59 BiQuad (const BiQuad &other);
61 void run (float *data, const uint32_t n_samples);
62 void compute (Type, double freq, double Q, double gain);
63 void reset () { _z1 = _z2 = 0.0; }