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mirror of https://github.com/f4exb/sdrangel.git synced 2024-11-26 01:39:05 -05:00

NFM demod and UDP source: revised FM completely rationalizing deviation. New input in UDP source GUI to specify the FM deviation

This commit is contained in:
f4exb 2016-04-04 03:44:06 +02:00
parent aafff9b534
commit f143b59403
11 changed files with 113 additions and 41 deletions

View File

@ -48,13 +48,13 @@ NFMDemod::NFMDemod() :
m_config.m_inputFrequencyOffset = 0;
m_config.m_rfBandwidth = 12500;
m_config.m_afBandwidth = 3000;
m_config.m_fmDeviation = 2000;
m_config.m_squelchGate = 5; // 10s of ms at 48000 Hz sample rate. Corresponds to 2400 for AGC attack
m_config.m_squelch = -30.0;
m_config.m_volume = 1.0;
m_config.m_ctcssOn = false;
m_config.m_audioMute = false;
m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
m_phaseDiscri.setFMScaling(384000/2400);
apply();
@ -78,6 +78,7 @@ NFMDemod::~NFMDemod()
void NFMDemod::configure(MessageQueue* messageQueue,
Real rfBandwidth,
Real afBandwidth,
int fmDeviation,
Real volume,
int squelchGate,
Real squelch,
@ -86,6 +87,7 @@ void NFMDemod::configure(MessageQueue* messageQueue,
{
Message* cmd = MsgConfigureNFMDemod::create(rfBandwidth,
afBandwidth,
fmDeviation,
volume,
squelchGate,
squelch,
@ -297,6 +299,7 @@ bool NFMDemod::handleMessage(const Message& cmd)
m_config.m_rfBandwidth = cfg.getRFBandwidth();
m_config.m_afBandwidth = cfg.getAFBandwidth();
m_config.m_fmDeviation = cfg.getFMDeviation();
m_config.m_volume = cfg.getVolume();
m_config.m_squelchGate = cfg.getSquelchGate();
m_config.m_squelch = cfg.getSquelch();
@ -307,6 +310,7 @@ bool NFMDemod::handleMessage(const Message& cmd)
qDebug() << "NFMDemod::handleMessage: MsgConfigureNFMDemod: m_rfBandwidth: " << m_config.m_rfBandwidth
<< " m_afBandwidth: " << m_config.m_afBandwidth
<< " m_fmDeviation: " << m_config.m_fmDeviation
<< " m_volume: " << m_config.m_volume
<< " m_squelchGate" << m_config.m_squelchGate
<< " m_squelch: " << m_config.m_squelch
@ -336,11 +340,15 @@ void NFMDemod::apply()
m_interpolator.create(16, m_config.m_inputSampleRate, m_config.m_rfBandwidth / 2.2);
m_interpolatorDistanceRemain = 0;
m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
m_fmExcursion = m_config.m_rfBandwidth / 2.0f;
m_phaseDiscri.setFMScaling(m_config.m_inputSampleRate / m_fmExcursion);
m_phaseDiscri.setFMScaling(m_config.m_rfBandwidth / (float) m_config.m_fmDeviation);
m_settingsMutex.unlock();
}
if (m_config.m_fmDeviation != m_running.m_fmDeviation)
{
m_phaseDiscri.setFMScaling(m_config.m_rfBandwidth / (float) m_config.m_fmDeviation);
}
if ((m_config.m_afBandwidth != m_running.m_afBandwidth) ||
(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
{
@ -368,6 +376,7 @@ void NFMDemod::apply()
m_running.m_inputFrequencyOffset = m_config.m_inputFrequencyOffset;
m_running.m_rfBandwidth = m_config.m_rfBandwidth;
m_running.m_afBandwidth = m_config.m_afBandwidth;
m_running.m_fmDeviation = m_config.m_fmDeviation;
m_running.m_squelchGate = m_config.m_squelchGate;
m_running.m_squelch = m_config.m_squelch;
m_running.m_volume = m_config.m_volume;

View File

@ -43,6 +43,7 @@ public:
void configure(MessageQueue* messageQueue,
Real rfBandwidth,
Real afBandwidth,
int fmDeviation,
Real volume,
int squelchGate,
Real squelch,
@ -77,6 +78,7 @@ private:
public:
Real getRFBandwidth() const { return m_rfBandwidth; }
Real getAFBandwidth() const { return m_afBandwidth; }
int getFMDeviation() const { return m_fmDeviation; }
Real getVolume() const { return m_volume; }\
int getSquelchGate() const { return m_squelchGate; }
Real getSquelch() const { return m_squelch; }
@ -85,18 +87,20 @@ private:
static MsgConfigureNFMDemod* create(Real rfBandwidth,
Real afBandwidth,
int fmDeviation,
Real volume,
int squelchGate,
Real squelch,
bool ctcssOn,
bool audioMute)
{
return new MsgConfigureNFMDemod(rfBandwidth, afBandwidth, volume, squelchGate, squelch, ctcssOn, audioMute);
return new MsgConfigureNFMDemod(rfBandwidth, afBandwidth, fmDeviation, volume, squelchGate, squelch, ctcssOn, audioMute);
}
private:
Real m_rfBandwidth;
Real m_afBandwidth;
int m_fmDeviation;
Real m_volume;
int m_squelchGate;
Real m_squelch;
@ -105,6 +109,7 @@ private:
MsgConfigureNFMDemod(Real rfBandwidth,
Real afBandwidth,
int fmDeviation,
Real volume,
int squelchGate,
Real squelch,
@ -113,6 +118,7 @@ private:
Message(),
m_rfBandwidth(rfBandwidth),
m_afBandwidth(afBandwidth),
m_fmDeviation(fmDeviation),
m_volume(volume),
m_squelchGate(squelchGate),
m_squelch(squelch),
@ -137,6 +143,7 @@ private:
qint64 m_inputFrequencyOffset;
Real m_rfBandwidth;
Real m_afBandwidth;
int m_fmDeviation;
int m_squelchGate;
Real m_squelch;
Real m_volume;
@ -150,7 +157,8 @@ private:
m_inputFrequencyOffset(0),
m_rfBandwidth(-1),
m_afBandwidth(-1),
m_squelchGate(50),
m_fmDeviation(1),
m_squelchGate(1),
m_squelch(0),
m_volume(0),
m_ctcssOn(false),

View File

@ -17,6 +17,9 @@
const int NFMDemodGUI::m_rfBW[] = {
5000, 6250, 8330, 10000, 12500, 15000, 20000, 25000, 40000
};
const int NFMDemodGUI::m_fmDev[] = { // corresponding FM deviations
1000, 1500, 2000, 2000, 2000, 2500, 3000, 3500, 5000
};
const int NFMDemodGUI::m_nbRfBW = 9;
NFMDemodGUI* NFMDemodGUI::create(PluginAPI* pluginAPI)
@ -331,6 +334,7 @@ void NFMDemodGUI::applySettings()
m_nfmDemod->configure(m_nfmDemod->getInputMessageQueue(),
m_rfBW[ui->rfBW->currentIndex()],
ui->afBW->value() * 1000.0,
m_fmDev[ui->rfBW->currentIndex()],
ui->volume->value() / 10.0,
ui->squelchGate->value(), // in 10ths of ms
ui->squelch->value(),

View File

@ -68,6 +68,7 @@ private:
MovingAverage<Real> m_channelPowerDbAvg;
static const int m_rfBW[];
static const int m_fmDev[];
static const int m_nbRfBW;
explicit NFMDemodGUI(PluginAPI* pluginAPI, QWidget* parent = NULL);

View File

@ -34,7 +34,8 @@ UDPSrc::UDPSrc(MessageQueue* uiMessageQueue, UDPSrcGUI* udpSrcGUI, SampleSink* s
m_audioFifo(4, 24000),
m_audioActive(false),
m_audioStereo(false),
m_volume(20)
m_volume(20),
m_fmDeviation(2500)
{
setObjectName("UDPSrc");
@ -66,6 +67,8 @@ UDPSrc::UDPSrc(MessageQueue* uiMessageQueue, UDPSrcGUI* udpSrcGUI, SampleSink* s
m_magsq = 0;
UDPFilter = new fftfilt(0.3 / 48.0, 16.0 / 48.0, udpBLockSampleSize * sizeof(Sample));
m_phaseDiscri.setFMScaling((float) m_outputSampleRate / (2.0f * m_fmDeviation));
if (m_audioSocket->bind(QHostAddress::LocalHost, m_audioPort))
{
qDebug("UDPSrc::UDPSrc: bind audio socket to port %d", m_audioPort);
@ -91,6 +94,7 @@ void UDPSrc::configure(MessageQueue* messageQueue,
SampleFormat sampleFormat,
Real outputSampleRate,
Real rfBandwidth,
int fmDeviation,
QString& udpAddress,
int udpPort,
int audioPort)
@ -98,6 +102,7 @@ void UDPSrc::configure(MessageQueue* messageQueue,
Message* cmd = MsgUDPSrcConfigure::create(sampleFormat,
outputSampleRate,
rfBandwidth,
fmDeviation,
udpAddress,
udpPort,
audioPort);
@ -162,25 +167,8 @@ void UDPSrc::feed(const SampleVector::const_iterator& begin, const SampleVector:
}
else if (m_sampleFormat == FormatNFM)
{
int n_out = UDPFilter->runFilt(ci, &sideband);
if (n_out)
{
Real sum = 1.0;
for (int i = 0; i < n_out; i+=2)
{
l = m_this.real() * (m_last.imag() - sideband[i].imag())
- m_this.imag() * (m_last.real() - sideband[i].real());
m_last = sideband[i];
r = m_last.real() * (m_this.imag() - sideband[i+1].imag())
- m_last.imag() * (m_this.real() - sideband[i+1].real());
m_this = sideband[i+1];
m_udpBuffer->write(Sample(l*m_scale, r*m_scale));
sum += m_this.real() * m_this.real() + m_this.imag() * m_this.imag();
}
m_scale = (24000 * udpBLockSampleSize * sizeof(Sample)) / sum; // TODO: correct levels
}
Real demod = 32768.0f * m_phaseDiscri.phaseDiscriminator(ci);
m_udpBuffer->write(Sample(demod, 0.0));
}
else // Raw I/Q samples
{
@ -189,7 +177,7 @@ void UDPSrc::feed(const SampleVector::const_iterator& begin, const SampleVector:
}
}
qDebug() << "UDPSrc::feed: " << m_sampleBuffer.size() * 4;
//qDebug() << "UDPSrc::feed: " << m_sampleBuffer.size() * 4;
if((m_spectrum != 0) && (m_spectrumEnabled))
{
@ -201,6 +189,7 @@ void UDPSrc::feed(const SampleVector::const_iterator& begin, const SampleVector:
void UDPSrc::start()
{
m_phaseDiscri.reset();
}
void UDPSrc::stop()
@ -316,6 +305,12 @@ bool UDPSrc::handleMessage(const Message& cmd)
}
}
if (cfg.getFMDeviation() != m_fmDeviation)
{
m_fmDeviation = cfg.getFMDeviation();
m_phaseDiscri.setFMScaling((float) m_outputSampleRate / (2.0f * m_fmDeviation));
}
m_interpolator.create(16, m_inputSampleRate, m_rfBandwidth / 2.0);
m_sampleDistanceRemain = m_inputSampleRate / m_outputSampleRate;

View File

@ -24,6 +24,7 @@
#include "dsp/nco.h"
#include "dsp/fftfilt.h"
#include "dsp/interpolator.h"
#include "dsp/phasediscri.h"
#include "util/udpsink.h"
#include "util/message.h"
#include "audio/audiofifo.h"
@ -57,6 +58,7 @@ public:
SampleFormat sampleFormat,
Real outputSampleRate,
Real rfBandwidth,
int fmDeviation,
QString& udpAddress,
int udpPort,
int audioPort);
@ -86,6 +88,7 @@ protected:
SampleFormat getSampleFormat() const { return m_sampleFormat; }
Real getOutputSampleRate() const { return m_outputSampleRate; }
Real getRFBandwidth() const { return m_rfBandwidth; }
int getFMDeviation() const { return m_fmDeviation; }
const QString& getUDPAddress() const { return m_udpAddress; }
int getUDPPort() const { return m_udpPort; }
int getAudioPort() const { return m_audioPort; }
@ -94,6 +97,7 @@ protected:
sampleFormat,
Real sampleRate,
Real rfBandwidth,
int fmDeviation,
QString& udpAddress,
int udpPort,
int audioPort)
@ -101,6 +105,7 @@ protected:
return new MsgUDPSrcConfigure(sampleFormat,
sampleRate,
rfBandwidth,
fmDeviation,
udpAddress,
udpPort,
audioPort);
@ -110,6 +115,7 @@ protected:
SampleFormat m_sampleFormat;
Real m_outputSampleRate;
Real m_rfBandwidth;
int m_fmDeviation;
QString m_udpAddress;
int m_udpPort;
int m_audioPort;
@ -117,6 +123,7 @@ protected:
MsgUDPSrcConfigure(SampleFormat sampleFormat,
Real outputSampleRate,
Real rfBandwidth,
int fmDeviation,
QString& udpAddress,
int udpPort,
int audioPort) :
@ -124,6 +131,7 @@ protected:
m_sampleFormat(sampleFormat),
m_outputSampleRate(outputSampleRate),
m_rfBandwidth(rfBandwidth),
m_fmDeviation(fmDeviation),
m_udpAddress(udpAddress),
m_udpPort(udpPort),
m_audioPort(audioPort)
@ -207,6 +215,7 @@ protected:
bool m_audioActive;
bool m_audioStereo;
int m_volume;
int m_fmDeviation;
Real m_magsq;
Real m_scale;
@ -230,6 +239,8 @@ protected:
quint32 m_nextSSBId;
quint32 m_nextS16leId;
PhaseDiscriminators m_phaseDiscri;
QMutex m_settingsMutex;
};

View File

@ -68,6 +68,7 @@ void UDPSrcGUI::resetToDefaults()
ui->sampleFormat->setCurrentIndex(0);
ui->sampleRate->setText("48000");
ui->rfBandwidth->setText("32000");
ui->fmDeviation->setText("2500");
ui->udpAddress->setText("127.0.0.1");
ui->udpPort->setText("9999");
ui->audioPort->setText("9999");
@ -99,6 +100,7 @@ QByteArray UDPSrcGUI::serialize() const
s.writeS32(12, (qint32)m_volume);
s.writeS32(13, m_audioPort);
s.writeBool(14, m_audioStereo);
s.writeS32(15, m_fmDeviation);
return s.final();
}
@ -164,6 +166,8 @@ bool UDPSrcGUI::deserialize(const QByteArray& data)
ui->audioPort->setText(QString("%1").arg(s32tmp));
d.readBool(14, &booltmp, false);
ui->audioStereo->setChecked(booltmp);
d.readS32(15, &s32tmp, 2500);
ui->fmDeviation->setText(QString("%1").arg(s32tmp));
blockApplySettings(false);
m_channelMarker.blockSignals(false);
@ -317,6 +321,13 @@ void UDPSrcGUI::applySettings()
audioPort = udpPort - 1;
}
int fmDeviation = ui->fmDeviation->text().toInt(&ok);
if ((!ok) || (fmDeviation < 1))
{
fmDeviation = 2500;
}
int boost = ui->boost->value();
setTitleColor(m_channelMarker.getColor());
@ -327,6 +338,7 @@ void UDPSrcGUI::applySettings()
//ui->udpAddress->setText(m_udpAddress);
ui->udpPort->setText(QString("%1").arg(udpPort));
ui->audioPort->setText(QString("%1").arg(audioPort));
ui->fmDeviation->setText(QString("%1").arg(fmDeviation));
ui->boost->setValue(boost);
m_channelMarker.disconnect(this, SLOT(channelMarkerChanged()));
m_channelMarker.setBandwidth((int)rfBandwidth);
@ -358,6 +370,7 @@ void UDPSrcGUI::applySettings()
m_sampleFormat = sampleFormat;
m_outputSampleRate = outputSampleRate;
m_rfBandwidth = rfBandwidth;
m_fmDeviation = fmDeviation;
m_udpPort = udpPort;
m_audioPort = audioPort;
m_boost = boost;
@ -366,6 +379,7 @@ void UDPSrcGUI::applySettings()
sampleFormat,
outputSampleRate,
rfBandwidth,
fmDeviation,
m_udpAddress,
udpPort,
audioPort);
@ -409,6 +423,11 @@ void UDPSrcGUI::on_rfBandwidth_textEdited(const QString& arg1)
ui->applyBtn->setEnabled(true);
}
void UDPSrcGUI::on_fmDeviation_textEdited(const QString& arg1)
{
ui->applyBtn->setEnabled(true);
}
void UDPSrcGUI::on_udpAddress_textEdited(const QString& arg1)
{
ui->applyBtn->setEnabled(true);

View File

@ -64,6 +64,7 @@ private slots:
void on_udpAddress_textEdited(const QString& arg1);
void on_udpPort_textEdited(const QString& arg1);
void on_audioPort_textEdited(const QString& arg1);
void on_fmDeviation_textEdited(const QString& arg1);
void on_audioActive_toggled(bool active);
void on_audioStereo_toggled(bool stereo);
void on_applyBtn_clicked();
@ -84,6 +85,7 @@ private:
UDPSrc::SampleFormat m_sampleFormat;
Real m_outputSampleRate;
Real m_rfBandwidth;
int m_fmDeviation;
int m_boost;
bool m_audioActive;
bool m_audioStereo;

View File

@ -6,8 +6,8 @@
<rect>
<x>0</x>
<y>0</y>
<width>257</width>
<height>324</height>
<width>290</width>
<height>158</height>
</rect>
</property>
<property name="font">
@ -24,10 +24,16 @@
<rect>
<x>10</x>
<y>5</y>
<width>241</width>
<width>270</width>
<height>142</height>
</rect>
</property>
<property name="minimumSize">
<size>
<width>270</width>
<height>0</height>
</size>
</property>
<property name="windowTitle">
<string>Settings</string>
</property>
@ -298,38 +304,55 @@
<item>
<widget class="QLabel" name="udpPortlabel">
<property name="text">
<string>Port</string>
<string>D</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="udpPort">
<property name="toolTip">
<string>Destination port</string>
<string>Remote data port</string>
</property>
<property name="text">
<string>9999</string>
</property>
</widget>
</item>
<item>
<widget class="QLabel" name="audioPortlabel">
<property name="text">
<string>A</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="audioPort">
<property name="toolTip">
<string>Local audio input port</string>
</property>
<property name="text">
<string>9998</string>
</property>
</widget>
</item>
</layout>
</item>
<item row="6" column="0">
<layout class="QHBoxLayout" name="AudioPortLayout">
<item>
<widget class="QLabel" name="audioPortlabel">
<widget class="QLabel" name="fmDevLabel">
<property name="text">
<string>Audio</string>
<string>FMd (Hz)</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="audioPort">
<widget class="QLineEdit" name="fmDeviation">
<property name="toolTip">
<string>Audio input port</string>
<string>FM deviation in Hz (for S16LE NFM format)</string>
</property>
<property name="text">
<string>9998</string>
<string>2500</string>
</property>
</widget>
</item>
@ -448,7 +471,7 @@
<item>
<widget class="QLineEdit" name="udpAddress">
<property name="toolTip">
<string>Destination address</string>
<string>Remote address</string>
</property>
<property name="text">
<string>127.0.0.1</string>
@ -522,7 +545,6 @@
</customwidgets>
<tabstops>
<tabstop>sampleFormat</tabstop>
<tabstop>udpPort</tabstop>
<tabstop>sampleRate</tabstop>
<tabstop>rfBandwidth</tabstop>
<tabstop>applyBtn</tabstop>

View File

@ -48,7 +48,7 @@ public:
{
Complex d(std::conj(m_m1Sample) * sample);
m_m1Sample = sample;
return (std::atan2(d.imag(), d.real()) / M_PI_2) * m_fmScaling;
return (std::atan2(d.imag(), d.real()) / M_PI) * m_fmScaling;
}
/**
@ -66,7 +66,8 @@ public:
m_m2Sample = m_m1Sample;
m_m1Sample = sample;
return ((h1 - h2) / M_PI_2) * m_fmScaling;
//return ((h1 - h2) / M_PI_2) * m_fmScaling;
return (h1 - h2) * m_fmScaling;
}
private:

View File

@ -84,7 +84,7 @@
<item>
<widget class="QLabel" name="label_2">
<property name="text">
<string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Version 1.1.6 - Copyright (C) 2015-2016 Edouard Griffiths, F4EXB. &lt;/p&gt;&lt;p&gt;Code at &lt;a href=&quot;https://github.com/f4exb/sdrangel&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;https://github.com/f4exb/sdrangel&lt;/span&gt;&lt;/a&gt; This is a complete redesign from RTL-SDRangelove at &lt;a href=&quot;https://github.com/hexameron/rtl-sdrangelove&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;https://github.com/hexameron/rtl-sdrangelove&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;p&gt;Many thanks to the original developers:&lt;/p&gt;&lt;p&gt;The osmocom developer team - especially horizon, Hoernchen &amp;amp; tnt.&lt;/p&gt;&lt;p&gt;Christian Daniel from maintech GmbH.&lt;/p&gt;&lt;p&gt;John Greb (hexameron) for the contributions in RTL-SDRangelove&lt;/p&gt;&lt;p&gt;The following rules apply to the SDRangel main application and libsdrbase:&lt;br/&gt;This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You should have received a copy of the GNU General Public License along with this program. If not, see &lt;a href=&quot;http://www.gnu.org/licenses/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;http://www.gnu.org/licenses/&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;p&gt;For the license of installed plugins, look into the plugin list.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
<string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Version 1.1.7 - Copyright (C) 2015-2016 Edouard Griffiths, F4EXB. &lt;/p&gt;&lt;p&gt;Code at &lt;a href=&quot;https://github.com/f4exb/sdrangel&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;https://github.com/f4exb/sdrangel&lt;/span&gt;&lt;/a&gt; This is a complete redesign from RTL-SDRangelove at &lt;a href=&quot;https://github.com/hexameron/rtl-sdrangelove&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;https://github.com/hexameron/rtl-sdrangelove&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;p&gt;Many thanks to the original developers:&lt;/p&gt;&lt;p&gt;The osmocom developer team - especially horizon, Hoernchen &amp;amp; tnt.&lt;/p&gt;&lt;p&gt;Christian Daniel from maintech GmbH.&lt;/p&gt;&lt;p&gt;John Greb (hexameron) for the contributions in RTL-SDRangelove&lt;/p&gt;&lt;p&gt;The following rules apply to the SDRangel main application and libsdrbase:&lt;br/&gt;This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You should have received a copy of the GNU General Public License along with this program. If not, see &lt;a href=&quot;http://www.gnu.org/licenses/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;http://www.gnu.org/licenses/&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;p&gt;For the license of installed plugins, look into the plugin list.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
</property>
<property name="wordWrap">
<bool>true</bool>