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0892892407
* Added a 'DISTRO-SPECIFIC NOTES' section to 'INSTALL'. Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
// rdwavescene.cpp
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//
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// GraphicsScene Class for Drawing Audio Waveforms
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//
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// (C) Copyright 2021 Fred Gleason <fredg@paravelsystems.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 version 2 as
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// published by the Free Software Foundation.
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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
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// License along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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#include <math.h>
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#include "rdwavescene.h"
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RDWaveScene::RDWaveScene(const QList<uint16_t> &energy,int x_shrink,qreal gain,
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int height,QObject *parent)
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: QGraphicsScene(0,0,energy.size()/x_shrink,height,parent)
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{
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d_energy_data=energy;
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d_x_shrink_factor=x_shrink;
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d_audio_gain=gain;
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d_height=(qreal)height;
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//
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// Gain Ratio
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//
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qreal ratio=exp10(d_audio_gain/20.0);
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//
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// Waveform
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//
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for(int i=0;i<energy.size();i+=x_shrink) {
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// printf("energy[%d]: %u\n",i,0xFFFF&energy.at(i));
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uint16_t lvl=energy.at(i);
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for(int j=1;j<x_shrink;j++) {
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if(((i+j)<energy.size())&&(energy.at(i+j))>lvl) {
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lvl=energy.at(i+j);
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}
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}
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// qreal rlvl=ratio*(qreal)lvl/327.67;
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qreal rlvl=ratio*(qreal)lvl*d_height/65534.0;
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// Bottom half
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addRect((qreal)(i/x_shrink),d_height/2.0,
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(qreal)1,rlvl,
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QPen(Qt::black),QBrush(Qt::black));
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// Top half
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addRect((qreal)(i/x_shrink),d_height/2.0,
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(qreal)1,-rlvl,
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QPen(Qt::black),QBrush(Qt::black));
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}
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}
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RDWaveScene::~RDWaveScene()
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{
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}
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