105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
/*
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* Copyright (C) 2016,2023 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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _lufs_meter_h_
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#define _lufs_meter_h_
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#include <cstdint>
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#include <functional>
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#include <map>
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#include "pbd/stack_allocator.h"
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#include "ardour/libardour_visibility.h"
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namespace ARDOUR {
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class LIBARDOUR_API LUFSMeter
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{
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public:
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LUFSMeter (double samplerate, uint32_t n_channels);
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LUFSMeter (LUFSMeter const& other) = delete;
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~LUFSMeter ();
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void run (float const** data, uint32_t n_samples);
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void reset ();
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float integrated_loudness () const;
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float momentary () const;
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float max_momentary () const;
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float dbtp () const;
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private:
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void init ();
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float process (float const** data, const uint32_t n_samples, uint32_t offset);
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float sumfrag (uint32_t) const;
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void calc_true_peak (float const** data, const uint32_t n_samples);
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float upsample_x4 (int chn, float const x);
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float upsample_x2 (int chn, float const x);
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std::function< float(int, const float) > upsample;
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const float _g[5] = { 1.0, 1.0, 1.0, 1.41, 1.41 };
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/* config */
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double _samplerate;
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uint32_t _n_channels;
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uint32_t _n_fragment;
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/* filter coeff */
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float _a0, _a1, _a2;
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float _b1, _b2;
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float _c3, _c4;
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/* state */
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uint32_t _frag_pos;
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float _frag_pwr;
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uint32_t _block_cnt;
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float _block_pwr;
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float _power[8];
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uint32_t _pow_idx;
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float _thresh_rel;
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float _momentary_l;
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float _maxloudn_M;
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float _integrated;
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float _dbtp;
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#if defined(_MSC_VER)
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typedef std::map<int, uint32_t> History;
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#else
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typedef std::map<int, uint32_t, std::less<int>, PBD::StackAllocator<std::pair<const int, uint32_t>, 1000>> History;
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#endif
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History _hist;
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struct FilterState {
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void reset ();
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void sanitize ();
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float z1, z2, z3, z4;
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};
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FilterState _fst[5];
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float* _z[5];
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};
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} // namespace ARDOUR
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#endif
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