1 /***************************************************************************
2 NotchFilterPlugin.cpp - Plugin for simple notch filtering
3 -------------------
4 begin : Thu Jun 19 2003
5 copyright : (C) 2003 by Dave Flogeras
6 email : d.flogeras@unb.ca
7 ***************************************************************************/
8
9 /***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
18 #include "config.h"
19
20 #include <errno.h>
21 #include <math.h>
22 #include <new>
23
24 #include <QStringList>
25
26 #include <KLocalizedString>
27
28 #include "NotchFilter.h"
29 #include "NotchFilterDialog.h"
30 #include "NotchFilterPlugin.h"
31 #include "libkwave/MultiTrackSource.h"
32
KWAVE_PLUGIN(notch_filter,NotchFilterPlugin)33 KWAVE_PLUGIN(notch_filter, NotchFilterPlugin)
34
35 //***************************************************************************
36 Kwave::NotchFilterPlugin::NotchFilterPlugin(QObject *parent,
37 const QVariantList &args)
38 :Kwave::FilterPlugin(parent, args),
39 m_frequency(3500.0), m_last_freq(100), m_bw(100), m_last_bw(200)
40 {
41 }
42
43 //***************************************************************************
~NotchFilterPlugin()44 Kwave::NotchFilterPlugin::~NotchFilterPlugin()
45 {
46 }
47
48 //***************************************************************************
interpreteParameters(QStringList & params)49 int Kwave::NotchFilterPlugin::interpreteParameters(QStringList ¶ms)
50 {
51 bool ok;
52 QString param;
53
54 // evaluate the parameter list
55 if (params.count() != 2) return -EINVAL;
56
57 param = params[0];
58 m_frequency = param.toDouble(&ok);
59 Q_ASSERT(ok);
60 if (!ok) return -EINVAL;
61
62 param = params[1];
63 m_bw = param.toDouble(&ok);
64 Q_ASSERT(ok);
65 if (!ok) return -EINVAL;
66
67 return 0;
68 }
69
70 //***************************************************************************
createDialog(QWidget * parent)71 Kwave::PluginSetupDialog *Kwave::NotchFilterPlugin::createDialog(QWidget *parent)
72 {
73 Kwave::NotchFilterDialog *dialog =
74 new(std::nothrow) Kwave::NotchFilterDialog(parent, signalRate());
75 Q_ASSERT(dialog);
76 if (!dialog) return Q_NULLPTR;
77
78 // connect the signals for detecting value changes in pre-listen mode
79 connect(dialog, SIGNAL(freqChanged(double)),
80 this, SLOT(setFreqValue(double)));
81 connect(dialog, SIGNAL(bwChanged(double)),
82 this, SLOT(setBwValue(double)));
83 return dialog;
84 }
85
86 //***************************************************************************
createFilter(unsigned int tracks)87 Kwave::SampleSource *Kwave::NotchFilterPlugin::createFilter(unsigned int tracks)
88 {
89 return new(std::nothrow)
90 Kwave::MultiTrackSource<Kwave::NotchFilter, true>(tracks);
91 }
92
93 //***************************************************************************
paramsChanged()94 bool Kwave::NotchFilterPlugin::paramsChanged()
95 {
96 return (!qFuzzyCompare(m_frequency, m_last_freq) ||
97 !qFuzzyCompare(m_bw, m_last_bw));
98 }
99
100 //***************************************************************************
updateFilter(Kwave::SampleSource * filter,bool force)101 void Kwave::NotchFilterPlugin::updateFilter(Kwave::SampleSource *filter,
102 bool force)
103 {
104 double sr = signalRate();
105
106 if (!filter) return;
107
108 if (!qFuzzyCompare(m_frequency, m_last_freq) || force)
109 filter->setAttribute(SLOT(setFrequency(QVariant)),
110 QVariant((m_frequency * 2.0 * M_PI) / sr));
111
112 if (!qFuzzyCompare(m_bw, m_last_bw) || force)
113 filter->setAttribute(SLOT(setBandwidth(QVariant)),
114 QVariant((m_bw * 2.0 * M_PI) / sr));
115
116 m_last_freq = m_frequency;
117 m_last_bw = m_bw;
118 }
119
120 //***************************************************************************
actionName()121 QString Kwave::NotchFilterPlugin::actionName()
122 {
123 return i18n("Notch Filter");
124 }
125
126 //***************************************************************************
setFreqValue(double frequency)127 void Kwave::NotchFilterPlugin::setFreqValue(double frequency)
128 {
129 m_frequency = frequency;
130 }
131
132 //***************************************************************************
setBwValue(double bw)133 void Kwave::NotchFilterPlugin::setBwValue(double bw)
134 {
135 m_bw = bw;
136 }
137
138 //***************************************************************************
139 #include "NotchFilterPlugin.moc"
140 //***************************************************************************
141 //***************************************************************************
142