67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
/**
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* @author Bojan MARKOVIC
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* @author Edouard DUPIN
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* @copyright 2006, ChunkWare Music Software, OPEN-SOURCE
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* @license BSD-1 (see license file)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* * The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <audio/algo/chunkware/CompressorRms.h>
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audio::algo::chunkware::CompresssorRms::CompresssorRms() :
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m_averager(5.0),
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m_averageSuares(DC_OFFSET) {
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}
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void audio::algo::chunkware::CompresssorRms::setSampleRate(double sampleRate) {
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audio::algo::chunkware::Compresssor::setSampleRate(sampleRate);
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m_averager.setSampleRate(sampleRate);
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}
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void audio::algo::chunkware::CompresssorRms::setWindow(double ms) {
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m_averager.setTc(ms);
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}
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void audio::algo::chunkware::CompresssorRms::initRuntime() {
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audio::algo::chunkware::Compresssor::initRuntime();
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m_averageSuares = DC_OFFSET;
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}
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void audio::algo::chunkware::CompresssorRms::process(double &in1, double &in2) {
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// create sidechain
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double inSq1 = in1 * in1; // square input
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double inSq2 = in2 * in2;
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double sum = inSq1 + inSq2; // power summing
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sum += DC_OFFSET; // DC offset, to prevent denormal
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m_averager.run(sum, m_averageSuares); // average of squares
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double rms = sqrt(m_averageSuares); // rms (sort of ...)
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/* REGARDING THE RMS AVERAGER: Ok, so this isn't a REAL RMS
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* calculation. A true RMS is an FIR moving average. This
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* approximation is a 1-pole IIR. Nonetheless, in practice,
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* and in the interest of simplicity, this method will suffice,
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* giving comparable results.
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*/
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// rest of process
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Compresssor::process(in1, in2, rms);
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}
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