90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
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* Copyright (C) 2012 Sakari Bergen <sakari.bergen@beatwaves.net>
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* Copyright (C) 2015-2016 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2015-2017 Paul Davis <paul@linuxaudiosystems.com>
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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/normalizer.h"
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namespace AudioGrapher
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{
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Normalizer::Normalizer (float target_dB)
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: enabled (false)
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, buffer (0)
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, buffer_size (0)
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{
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target = pow (10.0f, target_dB * 0.05f);
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}
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Normalizer::~Normalizer()
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{
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delete [] buffer;
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}
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/// Sets the peak found in the material to be normalized \see PeakReader \n RT safe
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float Normalizer::set_peak (float peak)
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{
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if (peak == 0.0f || peak == target) {
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/* don't even try */
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enabled = false;
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} else {
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enabled = true;
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gain = target / peak;
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}
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return enabled ? gain : 1.0;
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}
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/** Allocates a buffer for using with const ProcessContexts
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* This function does not need to be called if
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* non-const ProcessContexts are given to \a process() .
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* \n Not RT safe
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*/
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void Normalizer::alloc_buffer(samplecnt_t samples)
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{
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delete [] buffer;
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buffer = new float[samples];
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buffer_size = samples;
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}
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/// Process a const ProcessContext \see alloc_buffer() \n RT safe
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void Normalizer::process (ProcessContext<float> const & c)
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{
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if (throw_level (ThrowProcess) && c.samples() > buffer_size) {
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throw Exception (*this, "Too many samples given to process()");
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}
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if (enabled) {
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memcpy (buffer, c.data(), c.samples() * sizeof(float));
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Routines::apply_gain_to_buffer (buffer, c.samples(), gain);
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}
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ProcessContext<float> c_out (c, buffer);
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ListedSource<float>::output (c_out);
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}
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/// Process a non-const ProcsesContext in-place \n RT safe
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void Normalizer::process (ProcessContext<float> & c)
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{
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if (enabled) {
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Routines::apply_gain_to_buffer (c.data(), c.samples(), gain);
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}
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ListedSource<float>::output(c);
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}
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} // namespace
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