From c5fc860be9557402bf6c9b315739fe249223d9db Mon Sep 17 00:00:00 2001
From: Hexameron <hexameron@One.greyskull>
Date: Wed, 21 May 2014 18:31:14 +0100
Subject: [PATCH] SSB Demodulation.

---
 plugins/channel/CMakeLists.txt      |   1 +
 plugins/channel/ssb/CMakeLists.txt  |  47 +++++++
 plugins/channel/ssb/ssbdemod.cpp    | 126 +++++++++++++++++++
 plugins/channel/ssb/ssbdemod.h      |  91 ++++++++++++++
 plugins/channel/ssb/ssbdemodgui.cpp | 182 ++++++++++++++++++++++++++++
 plugins/channel/ssb/ssbdemodgui.h   |  60 +++++++++
 plugins/channel/ssb/ssbdemodgui.ui  | 172 ++++++++++++++++++++++++++
 plugins/channel/ssb/ssbplugin.cpp   |  53 ++++++++
 plugins/channel/ssb/ssbplugin.h     |  29 +++++
 9 files changed, 761 insertions(+)
 create mode 100644 plugins/channel/ssb/CMakeLists.txt
 create mode 100644 plugins/channel/ssb/ssbdemod.cpp
 create mode 100644 plugins/channel/ssb/ssbdemod.h
 create mode 100644 plugins/channel/ssb/ssbdemodgui.cpp
 create mode 100644 plugins/channel/ssb/ssbdemodgui.h
 create mode 100644 plugins/channel/ssb/ssbdemodgui.ui
 create mode 100644 plugins/channel/ssb/ssbplugin.cpp
 create mode 100644 plugins/channel/ssb/ssbplugin.h

diff --git a/plugins/channel/CMakeLists.txt b/plugins/channel/CMakeLists.txt
index e59574e1b..f12068de7 100644
--- a/plugins/channel/CMakeLists.txt
+++ b/plugins/channel/CMakeLists.txt
@@ -2,4 +2,5 @@ project(demod)
 
 add_subdirectory(nfm)
 add_subdirectory(tcpsrc)
+add_subdirectory(ssb)
 #add_subdirectory(tetra)
diff --git a/plugins/channel/ssb/CMakeLists.txt b/plugins/channel/ssb/CMakeLists.txt
new file mode 100644
index 000000000..e50d4ae5a
--- /dev/null
+++ b/plugins/channel/ssb/CMakeLists.txt
@@ -0,0 +1,47 @@
+project(ssb)
+
+set(ssb_SOURCES
+	ssbdemod.cpp
+	ssbdemodgui.cpp
+	ssbplugin.cpp
+)
+
+set(ssb_HEADERS
+	ssbdemod.h
+	ssbdemodgui.h
+	ssbplugin.h
+)
+
+set(ssb_FORMS
+	ssbdemodgui.ui
+)
+
+include_directories(
+	.
+	${CMAKE_CURRENT_BINARY_DIR}
+	${CMAKE_SOURCE_DIR}/include
+	${CMAKE_SOURCE_DIR}/include-gpl
+	${OPENGL_INCLUDE_DIR}
+)
+
+#include(${QT_USE_FILE})
+add_definitions(${QT_DEFINITIONS})
+add_definitions(-DQT_PLUGIN)
+add_definitions(-DQT_SHARED)
+
+#qt5_wrap_cpp(ssb_HEADERS_MOC ${ssb_HEADERS})
+qt5_wrap_ui(ssb_FORMS_HEADERS ${ssb_FORMS})
+
+add_library(demodssb SHARED
+	${ssb_SOURCES}
+	${ssb_HEADERS_MOC}
+	${ssb_FORMS_HEADERS}
+)
+
+target_link_libraries(demodssb
+	${QT_LIBRARIES}
+	${OPENGL_LIBRARIES}
+	sdrbase
+)
+
+qt5_use_modules(demodssb Core Widgets OpenGL Multimedia)
diff --git a/plugins/channel/ssb/ssbdemod.cpp b/plugins/channel/ssb/ssbdemod.cpp
new file mode 100644
index 000000000..757b8be29
--- /dev/null
+++ b/plugins/channel/ssb/ssbdemod.cpp
@@ -0,0 +1,126 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
+// written by Christian Daniel                                                   //
+// (c) 2014 Modified by John Greb
+//                                                                               //
+// 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 as version 3 of the License, or                  //
+//                                                                               //
+// 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. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#include <QTime>
+#include <stdio.h>
+#include "ssbdemod.h"
+#include "audio/audiooutput.h"
+#include "dsp/dspcommands.h"
+
+MESSAGE_CLASS_DEFINITION(SSBDemod::MsgConfigureSSBDemod, Message)
+
+SSBDemod::SSBDemod(AudioFifo* audioFifo, SampleSink* sampleSink) :
+	m_sampleSink(sampleSink),
+	m_audioFifo(audioFifo)
+{
+	m_Bandwidth = 10000;
+	m_volume = 2.0;
+	m_sampleRate = 96000;
+	m_frequency = 0;
+	m_nco.setFreq(m_frequency, m_sampleRate);
+	m_interpolator.create(16, m_sampleRate, 10000);
+	m_sampleDistanceRemain = (Real)m_sampleRate / 48000.0;
+
+	m_lowpass.create(21, 48000, 10000);
+
+	m_audioBuffer.resize(256);
+	m_audioBufferFill = 0;
+}
+
+SSBDemod::~SSBDemod()
+{
+}
+
+void SSBDemod::configure(MessageQueue* messageQueue, Real Bandwidth, Real volume)
+{
+	Message* cmd = MsgConfigureSSBDemod::create(Bandwidth, volume);
+	cmd->submit(messageQueue, this);
+}
+
+void SSBDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst)
+{
+	Complex ci;
+	bool consumed;
+
+	for(SampleVector::const_iterator it = begin; it < end; ++it) {
+		Complex c(it->real() / 32768.0, it->imag() / 32768.0);
+		c *= m_nco.nextIQ();
+
+		consumed = false;
+		// could squelch audio if RTL_SDR samplerate is not being fully decimated.
+		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
+			Real demod = ci.imag() + ci.real();
+			demod = m_lowpass.filter(demod * 0.5);
+			m_sampleBuffer.push_back(Sample(demod * 32768.0, demod * 32768.0));
+
+			demod *= m_volume;
+			qint16 sample = demod * 16384;
+
+			m_audioBuffer[m_audioBufferFill].l = sample;
+			m_audioBuffer[m_audioBufferFill].r = sample;
+			++m_audioBufferFill;
+			if(m_audioBufferFill >= m_audioBuffer.size()) {
+				uint res = m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
+				m_audioBufferFill = 0;
+			}
+			m_sampleDistanceRemain += (Real)m_sampleRate / 48000.0;
+		}
+	}
+	if(m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 0) != m_audioBufferFill)
+		;//qDebug("lost samples");
+	m_audioBufferFill = 0;
+
+	if(m_sampleSink != NULL)
+		m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), firstOfBurst);
+	m_sampleBuffer.clear();
+}
+
+void SSBDemod::start()
+{
+}
+
+void SSBDemod::stop()
+{
+}
+
+bool SSBDemod::handleMessage(Message* cmd)
+{
+	if(DSPSignalNotification::match(cmd)) {
+		DSPSignalNotification* signal = (DSPSignalNotification*)cmd;
+		qDebug("%d samples/sec, %lld Hz offset", signal->getSampleRate(), signal->getFrequencyOffset());
+		m_sampleRate = signal->getSampleRate();
+		m_nco.setFreq(-signal->getFrequencyOffset(), m_sampleRate);
+		m_interpolator.create(16, m_sampleRate, m_Bandwidth);
+		m_sampleDistanceRemain = m_sampleRate / 48000.0;
+		cmd->completed();
+		return true;
+	} else if(MsgConfigureSSBDemod::match(cmd)) {
+		MsgConfigureSSBDemod* cfg = (MsgConfigureSSBDemod*)cmd;
+		m_Bandwidth = cfg->getBandwidth();
+		m_interpolator.create(16, m_sampleRate, m_Bandwidth);
+		m_lowpass.create(21, 48000, cfg->getBandwidth());
+		m_volume = cfg->getVolume();
+		m_volume *= m_volume * 0.1;
+		cmd->completed();
+		return true;
+	} else {
+		if(m_sampleSink != NULL)
+		   return m_sampleSink->handleMessage(cmd);
+		else return false;
+	}
+}
diff --git a/plugins/channel/ssb/ssbdemod.h b/plugins/channel/ssb/ssbdemod.h
new file mode 100644
index 000000000..65230032c
--- /dev/null
+++ b/plugins/channel/ssb/ssbdemod.h
@@ -0,0 +1,91 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
+// written by Christian Daniel                                                   //
+//                                                                               //
+// 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 as version 3 of the License, or                  //
+//                                                                               //
+// 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. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_SSBDEMOD_H
+#define INCLUDE_SSBDEMOD_H
+
+#include <vector>
+#include "dsp/samplesink.h"
+#include "dsp/nco.h"
+#include "dsp/interpolator.h"
+#include "dsp/lowpass.h"
+#include "audio/audiofifo.h"
+#include "util/message.h"
+
+class AudioFifo;
+
+class SSBDemod : public SampleSink {
+public:
+	SSBDemod(AudioFifo* audioFifo, SampleSink* sampleSink);
+	~SSBDemod();
+
+	void configure(MessageQueue* messageQueue, Real Bandwidth, Real volume);
+
+	void feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst);
+	void start();
+	void stop();
+	bool handleMessage(Message* cmd);
+
+private:
+	class MsgConfigureSSBDemod : public Message {
+		MESSAGE_CLASS_DECLARATION
+
+	public:
+		Real getBandwidth() const { return m_Bandwidth; }
+		Real getVolume() const { return m_volume; }
+
+		static MsgConfigureSSBDemod* create(Real Bandwidth, Real volume)
+		{
+			return new MsgConfigureSSBDemod(Bandwidth, volume);
+		}
+
+	private:
+		Real m_Bandwidth;
+		Real m_volume;
+
+		MsgConfigureSSBDemod(Real Bandwidth, Real volume) :
+			Message(),
+			m_Bandwidth(Bandwidth),
+			m_volume(volume)
+		{ }
+	};
+
+	struct AudioSample {
+		qint16 l;
+		qint16 r;
+	};
+	typedef std::vector<AudioSample> AudioVector;
+
+	Real m_Bandwidth;
+	Real m_volume;
+	int m_sampleRate;
+	int m_frequency;
+
+	NCO m_nco;
+	Interpolator m_interpolator;
+	Real m_sampleDistanceRemain;
+	Lowpass<Real> m_lowpass;
+
+	AudioVector m_audioBuffer;
+	uint m_audioBufferFill;
+	AudioFifo* m_audioFifo;
+
+	SampleSink* m_sampleSink;
+	SampleVector m_sampleBuffer;
+};
+
+#endif // INCLUDE_SSBDEMOD_H
diff --git a/plugins/channel/ssb/ssbdemodgui.cpp b/plugins/channel/ssb/ssbdemodgui.cpp
new file mode 100644
index 000000000..b31cb42c7
--- /dev/null
+++ b/plugins/channel/ssb/ssbdemodgui.cpp
@@ -0,0 +1,182 @@
+#include <QDockWidget>
+#include <QMainWindow>
+#include "ssbdemodgui.h"
+#include "ui_ssbdemodgui.h"
+#include "ssbdemodgui.h"
+#include "ui_ssbdemodgui.h"
+#include "dsp/threadedsamplesink.h"
+#include "dsp/channelizer.h"
+#include "ssbdemod.h"
+#include "dsp/spectrumvis.h"
+#include "gui/glspectrum.h"
+#include "plugin/pluginapi.h"
+#include "util/simpleserializer.h"
+#include "gui/basicchannelsettingswidget.h"
+
+SSBDemodGUI* SSBDemodGUI::create(PluginAPI* pluginAPI)
+{
+	SSBDemodGUI* gui = new SSBDemodGUI(pluginAPI);
+	return gui;
+}
+
+void SSBDemodGUI::destroy()
+{
+	delete this;
+}
+
+void SSBDemodGUI::setName(const QString& name)
+{
+	setObjectName(name);
+}
+
+void SSBDemodGUI::resetToDefaults()
+{
+	ui->BW->setValue(3);
+	ui->volume->setValue(4);
+	applySettings();
+}
+
+QByteArray SSBDemodGUI::serialize() const
+{
+	SimpleSerializer s(1);
+	s.writeS32(1, m_channelMarker->getCenterFrequency());
+	s.writeS32(2, ui->BW->value());
+	s.writeS32(3, ui->volume->value());
+	s.writeBlob(4, ui->spectrumGUI->serialize());
+	s.writeU32(5, m_channelMarker->getColor().rgb());
+	return s.final();
+}
+
+bool SSBDemodGUI::deserialize(const QByteArray& data)
+{
+	SimpleDeserializer d(data);
+
+	if(!d.isValid()) {
+		resetToDefaults();
+		return false;
+	}
+
+	if(d.getVersion() == 1) {
+		QByteArray bytetmp;
+		quint32 u32tmp;
+		qint32 tmp;
+		d.readS32(1, &tmp, 0);
+		m_channelMarker->setCenterFrequency(tmp);
+		d.readS32(2, &tmp, 3);
+		ui->BW->setValue(tmp);
+		d.readS32(3, &tmp, 20);
+		ui->volume->setValue(tmp);
+		d.readBlob(4, &bytetmp);
+		ui->spectrumGUI->deserialize(bytetmp);
+		if(d.readU32(5, &u32tmp))
+			m_channelMarker->setColor(u32tmp);
+		applySettings();
+		return true;
+	} else {
+		resetToDefaults();
+		return false;
+	}
+}
+
+bool SSBDemodGUI::handleMessage(Message* message)
+{
+	return false;
+}
+
+void SSBDemodGUI::viewChanged()
+{
+	applySettings();
+}
+
+void SSBDemodGUI::on_BW_valueChanged(int value)
+{
+	ui->BWText->setText(QString("%1 kHz").arg(value));
+	m_channelMarker->setBandwidth(value * 1000);
+	applySettings();
+}
+
+void SSBDemodGUI::on_volume_valueChanged(int value)
+{
+	ui->volumeText->setText(QString("%1").arg(value / 10.0, 0, 'f', 1));
+	applySettings();
+}
+
+void SSBDemodGUI::onWidgetRolled(QWidget* widget, bool rollDown)
+{
+	/*
+	if((widget == ui->spectrumContainer) && (m_ssbDemod != NULL))
+		m_ssbDemod->setSpectrum(m_threadedSampleSink->getMessageQueue(), rollDown);
+	*/
+}
+
+void SSBDemodGUI::onMenuDoubleClicked()
+{
+	if(!m_basicSettingsShown) {
+		m_basicSettingsShown = true;
+		BasicChannelSettingsWidget* bcsw = new BasicChannelSettingsWidget(m_channelMarker, this);
+		bcsw->show();
+	}
+}
+
+SSBDemodGUI::SSBDemodGUI(PluginAPI* pluginAPI, QWidget* parent) :
+	RollupWidget(parent),
+	ui(new Ui::SSBDemodGUI),
+	m_pluginAPI(pluginAPI),
+	m_basicSettingsShown(false)
+{
+	ui->setupUi(this);
+	setAttribute(Qt::WA_DeleteOnClose, true);
+	connect(this, SIGNAL(widgetRolled(QWidget*,bool)), this, SLOT(onWidgetRolled(QWidget*,bool)));
+	connect(this, SIGNAL(menuDoubleClickEvent()), this, SLOT(onMenuDoubleClicked()));
+
+	m_audioFifo = new AudioFifo(4, 48000 / 4);
+	m_spectrumVis = new SpectrumVis(ui->glSpectrum);
+	m_ssbDemod = new SSBDemod(m_audioFifo, m_spectrumVis);
+	m_channelizer = new Channelizer(m_ssbDemod);
+	m_threadedSampleSink = new ThreadedSampleSink(m_channelizer);
+	m_pluginAPI->addAudioSource(m_audioFifo);
+	m_pluginAPI->addSampleSink(m_threadedSampleSink);
+
+	ui->glSpectrum->setCenterFrequency(0);
+	ui->glSpectrum->setSampleRate(48000);
+	ui->glSpectrum->setDisplayWaterfall(true);
+	ui->glSpectrum->setDisplayMaxHold(true);
+	m_spectrumVis->configure(m_threadedSampleSink->getMessageQueue(), 64, 10, FFTWindow::BlackmanHarris);
+
+	m_channelMarker = new ChannelMarker(this);
+	m_channelMarker->setColor(Qt::red);
+	m_channelMarker->setBandwidth(4000);
+	m_channelMarker->setCenterFrequency(0);
+	m_channelMarker->setVisible(true);
+	connect(m_channelMarker, SIGNAL(changed()), this, SLOT(viewChanged()));
+	m_pluginAPI->addChannelMarker(m_channelMarker);
+
+	ui->spectrumGUI->setBuddies(m_threadedSampleSink->getMessageQueue(), m_spectrumVis, ui->glSpectrum);
+
+	applySettings();
+}
+
+SSBDemodGUI::~SSBDemodGUI()
+{
+	m_pluginAPI->removeChannelInstance(this);
+	m_pluginAPI->removeAudioSource(m_audioFifo);
+	m_pluginAPI->removeSampleSink(m_threadedSampleSink);
+	delete m_threadedSampleSink;
+	delete m_channelizer;
+	delete m_ssbDemod;
+	delete m_spectrumVis;
+	delete m_audioFifo;
+	delete m_channelMarker;
+	delete ui;
+}
+
+void SSBDemodGUI::applySettings()
+{
+	setTitleColor(m_channelMarker->getColor());
+	m_channelizer->configure(m_threadedSampleSink->getMessageQueue(),
+		48000,
+		m_channelMarker->getCenterFrequency());
+	m_ssbDemod->configure(m_threadedSampleSink->getMessageQueue(),
+		ui->BW->value() * 1000.0,
+		ui->volume->value() / 10.0 );
+}
diff --git a/plugins/channel/ssb/ssbdemodgui.h b/plugins/channel/ssb/ssbdemodgui.h
new file mode 100644
index 000000000..58ac19126
--- /dev/null
+++ b/plugins/channel/ssb/ssbdemodgui.h
@@ -0,0 +1,60 @@
+#ifndef INCLUDE_SSBDEMODGUI_H
+#define INCLUDE_SSBDEMODGUI_H
+
+#include "gui/rollupwidget.h"
+#include "plugin/plugingui.h"
+
+class PluginAPI;
+class ChannelMarker;
+
+class AudioFifo;
+class ThreadedSampleSink;
+class Channelizer;
+class SSBDemod;
+class SpectrumVis;
+
+namespace Ui {
+	class SSBDemodGUI;
+}
+
+class SSBDemodGUI : public RollupWidget, public PluginGUI {
+	Q_OBJECT
+
+public:
+	static SSBDemodGUI* create(PluginAPI* pluginAPI);
+	void destroy();
+
+	void setName(const QString& name);
+
+	void resetToDefaults();
+	QByteArray serialize() const;
+	bool deserialize(const QByteArray& data);
+
+	bool handleMessage(Message* message);
+
+private slots:
+	void viewChanged();
+	void on_BW_valueChanged(int value);
+	void on_volume_valueChanged(int value);
+	void onWidgetRolled(QWidget* widget, bool rollDown);
+	void onMenuDoubleClicked();
+
+private:
+	Ui::SSBDemodGUI* ui;
+	PluginAPI* m_pluginAPI;
+	ChannelMarker* m_channelMarker;
+	bool m_basicSettingsShown;
+
+	AudioFifo* m_audioFifo;
+	ThreadedSampleSink* m_threadedSampleSink;
+	Channelizer* m_channelizer;
+	SSBDemod* m_ssbDemod;
+	SpectrumVis* m_spectrumVis;
+
+	explicit SSBDemodGUI(PluginAPI* pluginAPI, QWidget* parent = NULL);
+	~SSBDemodGUI();
+
+	void applySettings();
+};
+
+#endif // INCLUDE_SSBDEMODGUI_H
diff --git a/plugins/channel/ssb/ssbdemodgui.ui b/plugins/channel/ssb/ssbdemodgui.ui
new file mode 100644
index 000000000..2dfed425b
--- /dev/null
+++ b/plugins/channel/ssb/ssbdemodgui.ui
@@ -0,0 +1,172 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SSBDemodGUI</class>
+ <widget class="RollupWidget" name="SSBDemodGUI">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>302</width>
+    <height>410</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>SSB Demodulator</string>
+  </property>
+  <widget class="QWidget" name="settingsContainer" native="true">
+   <property name="geometry">
+    <rect>
+     <x>35</x>
+     <y>35</y>
+     <width>242</width>
+     <height>96</height>
+    </rect>
+   </property>
+   <property name="windowTitle">
+    <string>Settings</string>
+   </property>
+   <layout class="QGridLayout" name="gridLayout">
+    <property name="margin">
+     <number>2</number>
+    </property>
+    <property name="spacing">
+     <number>3</number>
+    </property>
+    <item row="0" column="0">
+     <widget class="QLabel" name="label">
+      <property name="text">
+       <string>Bandwidth</string>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="1">
+     <widget class="QSlider" name="BW">
+      <property name="minimum">
+       <number>1</number>
+      </property>
+      <property name="maximum">
+       <number>20</number>
+      </property>
+      <property name="pageStep">
+       <number>1</number>
+      </property>
+      <property name="value">
+       <number>3</number>
+      </property>
+      <property name="orientation">
+       <enum>Qt::Horizontal</enum>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="2">
+     <widget class="QLabel" name="BWText">
+      <property name="minimumSize">
+       <size>
+        <width>50</width>
+        <height>0</height>
+       </size>
+      </property>
+      <property name="text">
+       <string>3 kHz</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+      </property>
+     </widget>
+    </item>
+    <item row="1" column="0">
+     <widget class="QLabel" name="label_2">
+      <property name="text">
+       <string>Volume</string>
+      </property>
+     </widget>
+    </item>
+    <item row="1" column="1">
+     <widget class="QSlider" name="volume">
+      <property name="maximum">
+       <number>100</number>
+      </property>
+      <property name="value">
+       <number>20</number>
+      </property>
+      <property name="orientation">
+       <enum>Qt::Horizontal</enum>
+      </property>
+     </widget>
+    </item>
+    <item row="1" column="2">
+     <widget class="QLabel" name="volumeText">
+      <property name="minimumSize">
+       <size>
+        <width>50</width>
+        <height>0</height>
+       </size>
+      </property>
+      <property name="text">
+       <string>2.0</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QWidget" name="spectrumContainer" native="true">
+   <property name="geometry">
+    <rect>
+     <x>40</x>
+     <y>140</y>
+     <width>218</width>
+     <height>184</height>
+    </rect>
+   </property>
+   <property name="windowTitle">
+    <string>Channel Spectrum</string>
+   </property>
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <property name="spacing">
+     <number>2</number>
+    </property>
+    <property name="margin">
+     <number>3</number>
+    </property>
+    <item>
+     <widget class="GLSpectrum" name="glSpectrum" native="true">
+      <property name="minimumSize">
+       <size>
+        <width>200</width>
+        <height>150</height>
+       </size>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="GLSpectrumGUI" name="spectrumGUI" native="true"/>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>GLSpectrum</class>
+   <extends>QWidget</extends>
+   <header>gui/glspectrum.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>GLSpectrumGUI</class>
+   <extends>QWidget</extends>
+   <header>gui/glspectrumgui.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>RollupWidget</class>
+   <extends>QWidget</extends>
+   <header>gui/rollupwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/plugins/channel/ssb/ssbplugin.cpp b/plugins/channel/ssb/ssbplugin.cpp
new file mode 100644
index 000000000..1b51b76c8
--- /dev/null
+++ b/plugins/channel/ssb/ssbplugin.cpp
@@ -0,0 +1,53 @@
+#include <QtPlugin>
+#include <QAction>
+#include "plugin/pluginapi.h"
+#include "ssbplugin.h"
+#include "ssbdemodgui.h"
+
+const PluginDescriptor SSBPlugin::m_pluginDescriptor = {
+	QString("SSB Demodulator"),
+	QString("---"),
+	QString("(c) maintech GmbH (rewritten by John Greb)"),
+	QString("http://www.maintech.de"),
+	true,
+	QString("http://www.maintech.de")
+};
+
+SSBPlugin::SSBPlugin(QObject* parent) :
+	QObject(parent)
+{
+}
+
+const PluginDescriptor& SSBPlugin::getPluginDescriptor() const
+{
+	return m_pluginDescriptor;
+}
+
+void SSBPlugin::initPlugin(PluginAPI* pluginAPI)
+{
+	m_pluginAPI = pluginAPI;
+
+	// register demodulator
+	QAction* action = new QAction(tr("&SSB Demodulator"), this);
+	connect(action, SIGNAL(triggered()), this, SLOT(createInstanceSSB()));
+	m_pluginAPI->registerChannel("de.maintech.sdrangelove.channel.ssb", this, action);
+}
+
+PluginGUI* SSBPlugin::createChannel(const QString& channelName)
+{
+	if(channelName == "de.maintech.sdrangelove.channel.ssb") {
+		SSBDemodGUI* gui = SSBDemodGUI::create(m_pluginAPI);
+		m_pluginAPI->registerChannelInstance("de.maintech.sdrangelove.channel.ssb", gui);
+		m_pluginAPI->addChannelRollup(gui);
+		return gui;
+	} else {
+		return NULL;
+	}
+}
+
+void SSBPlugin::createInstanceSSB()
+{
+	SSBDemodGUI* gui = SSBDemodGUI::create(m_pluginAPI);
+	m_pluginAPI->registerChannelInstance("de.maintech.sdrangelove.channel.ssb", gui);
+	m_pluginAPI->addChannelRollup(gui);
+}
diff --git a/plugins/channel/ssb/ssbplugin.h b/plugins/channel/ssb/ssbplugin.h
new file mode 100644
index 000000000..7686d7f19
--- /dev/null
+++ b/plugins/channel/ssb/ssbplugin.h
@@ -0,0 +1,29 @@
+#ifndef INCLUDE_SSBPLUGIN_H
+#define INCLUDE_SSBPLUGIN_H
+
+#include <QObject>
+#include "plugin/plugininterface.h"
+
+class SSBPlugin : public QObject, PluginInterface {
+	Q_OBJECT
+	Q_INTERFACES(PluginInterface)
+	Q_PLUGIN_METADATA(IID "de.maintech.sdrangelove.channel.ssb")
+
+public:
+	explicit SSBPlugin(QObject* parent = NULL);
+
+	const PluginDescriptor& getPluginDescriptor() const;
+	void initPlugin(PluginAPI* pluginAPI);
+
+	PluginGUI* createChannel(const QString& channelName);
+
+private:
+	static const PluginDescriptor m_pluginDescriptor;
+
+	PluginAPI* m_pluginAPI;
+
+private slots:
+	void createInstanceSSB();
+};
+
+#endif // INCLUDE_SSBPLUGIN_H