90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
/*
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* Author: Harry van Haaren 2013
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* harryhaaren@gmail.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 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 OPENAV_DSP_DBMETER_H
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#define OPENAV_DSP_DBMETER_H
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#include <math.h>
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#include <cmath>
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#include <cstdlib>
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class DBMeter
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{
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public:
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DBMeter(int rate)
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{
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fSamplingFreq = rate;
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fConst0 = (96.f / float(min(192000, max(1, fSamplingFreq))));
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fRec0[0] = -96.f;
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fRec0[1] = -96.f;
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fRec1[0] = -96.f;
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fRec1[1] = -96.f;
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fvbargraph0 = -96.f;
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fvbargraph1 = -96.f;
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}
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int getNumInputs() { return 2;}
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int getNumOutputs(){ return 2;}
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// call these to get the current dB values
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float getLeftDB()
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{
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// range scale from range = -96 -> +10, to 0 -> 1
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float zeroOneL = (1-(fvbargraph0 / -96.f));
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fvbargraph0 = -96;
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return pow(zeroOneL, 4);
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}
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float getRightDB()
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{
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float zeroOneR = (1-(fvbargraph1 / -96.f));
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fvbargraph1 = -96;
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return pow(zeroOneR, 4);
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}
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void process(int count, float* inputL, float* inputR )
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{
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for (int i = 0; (i < count); i = (i + 1))
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{
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fRec0[0] = max((fRec0[1] - fConst0), min(10.f, (20.f * log10f(max(1.58489e-05f, fabsf(*inputL))))));
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if ( fvbargraph0 < fRec0[0] )
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fvbargraph0 = fRec0[0];
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fRec1[0] = max((fRec1[1] - fConst0), min(10.f, (20.f * log10f(max(1.58489e-05f, fabsf(*inputR))))));
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if ( fvbargraph1 < fRec1[0] )
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fvbargraph1 = fRec1[0];
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fRec0[1] = fRec0[0];
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fRec1[1] = fRec1[0];
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}
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}
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private:
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float fRec0[2];
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float fRec1[2];
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int fSamplingFreq;
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float fConst0;
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float fvbargraph0;
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float fvbargraph1;
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};
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#endif // OPENAV_DSP_DBMETER_H
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