129 lines
2.2 KiB
C
129 lines
2.2 KiB
C
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/*
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* Copyright (C) 2010-2018 Fons Adriaensen <fons@linuxaudio.org>
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* Copyright (C) 2021 Robin Gareus <robin@gareus.org>
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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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#ifndef _PEAKLIM_H
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#define _PEAKLIM_H
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#include <stdint.h>
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namespace AudioGrapherDSP {
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class Limiter
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{
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public:
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Limiter ();
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~Limiter ();
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void init (float fsamp, int nchan);
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void fini ();
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void set_inpgain (float);
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void set_threshold (float);
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void set_release (float);
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void set_truepeak (bool);
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int
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get_latency () const
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{
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return _delay;
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}
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void
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get_stats (float* peak, float* gmax, float* gmin)
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{
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*peak = _peak;
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*gmax = _gmax;
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*gmin = _gmin;
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_rstat = true;
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}
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void process (int nsamp, float const* inp, float* out);
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private:
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class Histmin
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{
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public:
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void init (int hlen);
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float write (float v);
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float vmin () { return _vmin; }
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private:
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enum {
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SIZE = 32,
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MASK = SIZE - 1
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};
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int _hlen;
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int _hold;
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int _wind;
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float _vmin;
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float _hist[SIZE];
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};
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class Upsampler
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{
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public:
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Upsampler ();
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~Upsampler ();
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void init (int nchan);
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void fini ();
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int
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get_latency () const
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{
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return 23;
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}
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float process_one (int chn, float const x);
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private:
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int _nchan;
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float** _z;
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};
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float _fsamp;
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int _nchan;
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bool _truepeak;
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float** _dly_buf;
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float* _zlf;
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int _delay;
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int _dly_mask;
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int _dly_ridx;
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int _div1, _div2;
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int _c1, _c2;
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float _g0, _g1, _dg;
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float _gt, _m1, _m2;
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float _w1, _w2, _w3, _wlf;
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float _z1, _z2, _z3;
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bool _rstat;
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float _peak;
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float _gmax;
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float _gmin;
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Upsampler _upsampler;
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Histmin _hist1;
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Histmin _hist2;
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};
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}
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#endif
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