153 lines
3.5 KiB
C++
153 lines
3.5 KiB
C++
/*
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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 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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#include "audiographer/general/limiter.h"
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namespace AudioGrapher
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{
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Limiter::Limiter (float sample_rate, unsigned int channels, samplecnt_t size)
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: _enabled (false)
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, _buf (0)
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, _size (0)
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, _cnt (0)
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, _spp (0)
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, _pos (0)
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{
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_limiter.init (sample_rate, channels);
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_limiter.set_truepeak (true);
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_limiter.set_inpgain (0);
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_limiter.set_threshold (-1);
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_limiter.set_release (0.01);
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_latency = _limiter.get_latency ();
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_buf = new float[size];
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_size = size;
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}
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Limiter::~Limiter ()
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{
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delete [] _buf;
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}
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void
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Limiter::set_input_gain (float dB)
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{
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_enabled = _enabled || dB != 0;
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_limiter.set_inpgain (dB);
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}
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void
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Limiter::set_threshold (float dB)
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{
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_enabled = true;
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_limiter.set_threshold (dB);
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}
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void
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Limiter::set_release (float s)
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{
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_limiter.set_release (s);
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}
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void
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Limiter::set_duration (samplecnt_t s)
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{
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if (_pos != 0 || !_result) {
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return;
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}
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_spp = ceilf ((s + 2.f) / (float) _result->width);
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}
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void
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Limiter::set_result (ARDOUR::ExportAnalysisPtr r)
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{
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_result = r;
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}
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void
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Limiter::stats (samplecnt_t n_samples)
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{
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if (!_result || _spp == 0) {
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return;
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}
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_cnt += n_samples;
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while (_cnt >= _spp) {
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float peak, gmax, gmin;
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_limiter.get_stats (&peak, &gmax, &gmin);
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_cnt -= _spp;
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assert (_pos < _result->width);
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_result->limiter_pk[_pos++] = peak;
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}
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}
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void Limiter::process (ProcessContext<float> const& ctx)
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{
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const samplecnt_t n_samples = ctx.samples_per_channel ();
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const int n_channels = ctx.channels ();
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if (!_enabled) {
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ProcessContext<float> c_out (ctx);
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ListedSource<float>::output (c_out);
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return;
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}
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_limiter.process (n_samples, ctx.data (), _buf);
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stats (n_samples);
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if (_latency > 0) {
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samplecnt_t ns = n_samples > _latency ? n_samples - _latency : 0;
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if (ns > 0) {
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ProcessContext<float> ctx_out (ctx, &_buf[n_channels * _latency], n_channels * ns);
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ctx_out.remove_flag (ProcessContext<float>::EndOfInput);
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this->output (ctx_out);
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}
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if (n_samples >= _latency) {
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_latency = 0;
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} else {
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_latency -= n_samples;
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}
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} else {
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ProcessContext<float> ctx_out (ctx, _buf);
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ctx_out.remove_flag (ProcessContext<float>::EndOfInput);
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this->output (ctx_out);
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}
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if (ctx.has_flag(ProcessContext<float>::EndOfInput)) {
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samplecnt_t bs = _size / n_channels;
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_latency = _limiter.get_latency ();
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while (_latency > 0) {
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memset (_buf, 0, _size * sizeof (float));
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samplecnt_t ns = _latency > bs ? bs : _latency;
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_limiter.process (ns, _buf, _buf);
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//stats (ns);
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ProcessContext<float> ctx_out (ctx, _buf, ns * n_channels);
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if (_latency == ns) {
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ctx_out.set_flag (ProcessContext<float>::EndOfInput);
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} else {
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ctx_out.remove_flag (ProcessContext<float>::EndOfInput);
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}
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this->output (ctx_out);
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_latency -= ns;
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}
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}
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}
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} // namespace
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