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Template for (possible) kernel driver.

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This commit is contained in:
John Greb 2014-11-03 17:13:32 +00:00
parent d132f07bbe
commit cce7115288
10 changed files with 1169 additions and 0 deletions
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50
plugins/samplesource/v4l/CMakeLists.txt Normal file
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project(v4l)
set(v4l_SOURCES
v4lgui.cpp
v4linput.cpp
v4lplugin.cpp
v4lthread.cpp
)
set(rtlsdr_HEADERS
v4lgui.h
v4linput.h
v4lplugin.h
v4lthread.h
)
set(v4l_FORMS
v4lgui.ui
)
include_directories(
.
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_SOURCE_DIR}/include
${CMAKE_SOURCE_DIR}/include-gpl
${LIBRTLSDR_INCLUDE_DIR}
)
#include(${QT_USE_FILE})
add_definitions(${QT_DEFINITIONS})
add_definitions(-DQT_PLUGIN)
add_definitions(-DQT_SHARED)
#qt4_wrap_cpp(rtlsdr_HEADERS_MOC ${v4l_HEADERS})
qt5_wrap_ui(v4l_FORMS_HEADERS ${v4l_FORMS})
add_library(inputv4l SHARED
${v4l_SOURCES}
${v4l_HEADERS_MOC}
${v4l_FORMS_HEADERS}
)
target_link_libraries(inputv4l
${QT_LIBRARIES}
${LIBRTLSDR_LIBRARIES}
${LIBUSB_LIBRARIES}
sdrbase
)
qt5_use_modules(inputv4l Core Widgets OpenGL Multimedia)

154
plugins/samplesource/v4l/v4lgui.cpp Normal file
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#include "v4lgui.h"
#include "ui_v4lgui.h"
#include "plugin/pluginapi.h"
V4LGui::V4LGui(PluginAPI* pluginAPI, QWidget* parent) :
QWidget(parent),
ui(new Ui::V4LGui),
m_pluginAPI(pluginAPI),
m_settings(),
m_sampleSource(NULL)
{
ui->setupUi(this);
ui->centerFrequency->setValueRange(7, 20000U, 2200000U);
connect(&m_updateTimer, SIGNAL(timeout()), this, SLOT(updateHardware()));
displaySettings();
m_sampleSource = new V4LInput(m_pluginAPI->getMainWindowMessageQueue());
m_pluginAPI->setSampleSource(m_sampleSource);
}
V4LGui::~V4LGui()
{
delete ui;
}
void V4LGui::destroy()
{
delete this;
}
void V4LGui::setName(const QString& name)
{
setObjectName(name);
}
void V4LGui::resetToDefaults()
{
m_generalSettings.resetToDefaults();
m_settings.resetToDefaults();
displaySettings();
sendSettings();
}
QByteArray V4LGui::serializeGeneral() const
{
return m_generalSettings.serialize();
}
bool V4LGui::deserializeGeneral(const QByteArray&data)
{
if(m_generalSettings.deserialize(data)) {
displaySettings();
sendSettings();
return true;
} else {
resetToDefaults();
return false;
}
}
quint64 V4LGui::getCenterFrequency() const
{
return m_generalSettings.m_centerFrequency;
}
QByteArray V4LGui::serialize() const
{
return m_settings.serialize();
}
bool V4LGui::deserialize(const QByteArray& data)
{
if(m_settings.deserialize(data)) {
displaySettings();
sendSettings();
return true;
} else {
resetToDefaults();
return false;
}
}
bool V4LGui::handleMessage(Message* message)
{
if(V4LInput::MsgReportV4L::match(message)) {
m_gains = ((V4LInput::MsgReportV4L*)message)->getGains();
displaySettings();
message->completed();
return true;
} else {
return false;
}
}
void V4LGui::displaySettings()
{
ui->centerFrequency->setValue(m_generalSettings.m_centerFrequency / 1000);
ui->decimation->setValue(m_settings.m_decimation);
if(m_gains.size() > 0) {
int dist = abs(m_settings.m_gain - m_gains[0]);
int pos = 0;
for(uint i = 1; i < m_gains.size(); i++) {
if(abs(m_settings.m_gain - m_gains[i]) < dist) {
dist = abs(m_settings.m_gain - m_gains[i]);
pos = i;
}
}
ui->gainText->setText(tr("%1.%2").arg(m_gains[pos] / 10).arg(abs(m_gains[pos] % 10)));
ui->gain->setMaximum(m_gains.size() - 1);
ui->gain->setEnabled(true);
ui->gain->setValue(pos);
} else {
ui->gain->setMaximum(0);
ui->gain->setEnabled(false);
ui->gain->setValue(0);
}
}
void V4LGui::sendSettings()
{
if(!m_updateTimer.isActive())
m_updateTimer.start(100);
}
void V4LGui::on_centerFrequency_changed(quint64 value)
{
m_generalSettings.m_centerFrequency = value * 1000;
sendSettings();
}
void V4LGui::on_gain_valueChanged(int value)
{
if(value > (int)m_gains.size())
return;
int gain = m_gains[value];
ui->gainText->setText(tr("%1.%2").arg(gain / 10).arg(abs(gain % 10)));
m_settings.m_gain = gain;
sendSettings();
}
void V4LGui::on_decimation_valueChanged(int value)
{
ui->decimationText->setText(tr("1:%1").arg(1 << value));
m_settings.m_decimation = value;
sendSettings();
}
void V4LGui::updateHardware()
{
V4LInput::MsgConfigureV4L* message = V4LInput::MsgConfigureV4L::create(m_generalSettings, m_settings);
message->submit(m_pluginAPI->getDSPEngineMessageQueue());
m_updateTimer.stop();
}

53
plugins/samplesource/v4l/v4lgui.h Normal file
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#ifndef INCLUDE_V4LGUI_H
#define INCLUDE_V4LGUI_H
#include <QTimer>
#include "plugin/plugingui.h"
#include "v4linput.h"
class PluginAPI;
namespace Ui {
class V4LGui;
}
class V4LGui : public QWidget, public PluginGUI {
Q_OBJECT
public:
explicit V4LGui(PluginAPI* pluginAPI, QWidget* parent = NULL);
~V4LGui();
void destroy();
void setName(const QString& name);
void resetToDefaults();
QByteArray serializeGeneral() const;
bool deserializeGeneral(const QByteArray&data);
quint64 getCenterFrequency() const;
QByteArray serialize() const;
bool deserialize(const QByteArray& data);
bool handleMessage(Message* message);
private:
Ui::V4LGui* ui;
PluginAPI* m_pluginAPI;
SampleSource::GeneralSettings m_generalSettings;
V4LInput::Settings m_settings;
QTimer m_updateTimer;
std::vector<int> m_gains;
SampleSource* m_sampleSource;
void displaySettings();
void sendSettings();
private slots:
void on_centerFrequency_changed(quint64 value);
void on_gain_valueChanged(int value);
void on_decimation_valueChanged(int value);
void updateHardware();
};
#endif // INCLUDE_V4LGUI_H

229
plugins/samplesource/v4l/v4lgui.ui Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>V4LGui</class>
<widget class="QWidget" name="V4LGui">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>132</width>
<height>82</height>
</rect>
</property>
<property name="sizePolicy">
<sizepolicy hsizetype="Preferred" vsizetype="Maximum">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="windowTitle">
<string>Video4Linux</string>
</property>
<layout class="QVBoxLayout" name="verticalLayout">
<property name="spacing">
<number>3</number>
</property>
<property name="leftMargin">
<number>2</number>
</property>
<property name="topMargin">
<number>2</number>
</property>
<property name="rightMargin">
<number>2</number>
</property>
<property name="bottomMargin">
<number>2</number>
</property>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_3">
<item>
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="ValueDial" name="centerFrequency" native="true">
<property name="sizePolicy">
<sizepolicy hsizetype="Maximum" vsizetype="Maximum">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>32</width>
<height>16</height>
</size>
</property>
<property name="font">
<font>
<family>Monospace</family>
<pointsize>20</pointsize>
</font>
</property>
<property name="focusPolicy">
<enum>Qt::StrongFocus</enum>
</property>
<property name="toolTip">
<string>Tuner center frequency in kHz</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
</layout>
</item>
<item>
<widget class="Line" name="line_4">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
</item>
<item>
<layout class="QGridLayout" name="gridLayout_3">
<property name="spacing">
<number>3</number>
</property>
<item row="0" column="1">
<widget class="QSlider" name="decimation">
<property name="toolTip">
<string>Signal decimation factor</string>
</property>
<property name="maximum">
<number>4</number>
</property>
<property name="pageStep">
<number>1</number>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="label_12">
<property name="sizePolicy">
<sizepolicy hsizetype="Maximum" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text">
<string>Zoom Out</string>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QLabel" name="decimationText">
<property name="minimumSize">
<size>
<width>40</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>1:1</string>
</property>
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
</widget>
</item>
</layout>
</item>
<item>
<widget class="Line" name="line_3">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
</item>
<item>
<layout class="QGridLayout" name="gridLayout_2">
<property name="spacing">
<number>3</number>
</property>
<item row="0" column="0">
<widget class="QLabel" name="label_11">
<property name="sizePolicy">
<sizepolicy hsizetype="Maximum" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text">
<string>Gain</string>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QSlider" name="gain">
<property name="enabled">
<bool>false</bool>
</property>
<property name="toolTip">
<string>LNA amplification</string>
</property>
<property name="maximum">
<number>0</number>
</property>
<property name="pageStep">
<number>1</number>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QLabel" name="gainText">
<property name="minimumSize">
<size>
<width>40</width>
<height>0</height>
</size>
</property>
<property name="text">
<string>---</string>
</property>
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
<customwidgets>
<customwidget>
<class>ValueDial</class>
<extends>QWidget</extends>
<header>gui/valuedial.h</header>
<container>1</container>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>

231
plugins/samplesource/v4l/v4linput.cpp Normal file
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///////////////////////////////////////////////////////////////////////////////////
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <string.h>
#include <errno.h>
#include "v4linput.h"
#include "v4lthread.h"
#include "v4lgui.h"
#include "util/simpleserializer.h"
MESSAGE_CLASS_DEFINITION(V4LInput::MsgConfigureV4L, Message)
MESSAGE_CLASS_DEFINITION(V4LInput::MsgReportV4L, Message)
V4LInput::Settings::Settings() :
m_gain(0),
m_decimation(0)
{
}
void V4LInput::Settings::resetToDefaults()
{
m_gain = 0;
m_decimation = 0;
}
QByteArray V4LInput::Settings::serialize() const
{
SimpleSerializer s(1);
s.writeS32(1, m_gain);
s.writeS32(2, m_decimation);
return s.final();
}
bool V4LInput::Settings::deserialize(const QByteArray& data)
{
SimpleDeserializer d(data);
if(!d.isValid()) {
resetToDefaults();
return false;
}
if(d.getVersion() == 1) {
d.readS32(1, &m_gain, 0);
d.readS32(2, &m_decimation, 0);
return true;
} else {
resetToDefaults();
return false;
}
}
V4LInput::V4LInput(MessageQueue* msgQueueToGUI) :
SampleSource(msgQueueToGUI),
m_settings(),
m_dev(NULL),
m_V4LThread(NULL),
m_deviceDescription()
{
}
V4LInput::~V4LInput()
{
stopInput();
}
bool V4LInput::startInput(int device)
{
QMutexLocker mutexLocker(&m_mutex);
if(m_dev != NULL)
stopInput();
char vendor[256];
char product[256];
char serial[256];
int res;
int numberOfGains;
if(!m_sampleFifo.setSize(524288)) {
qCritical("Could not allocate SampleFifo");
return false;
}
if((res = rtlsdr_open(&m_dev, device)) < 0) {
qCritical("could not open RTLSDR #%d: %s", device, strerror(errno));
return false;
}
vendor[0] = '\0';
product[0] = '\0';
serial[0] = '\0';
if((res = rtlsdr_get_usb_strings(m_dev, vendor, product, serial)) < 0) {
qCritical("error accessing USB device");
goto failed;
}
qWarning("RTLSDRInput open: %s %s, SN: %s", vendor, product, serial);
m_deviceDescription = QString("%1 (SN %2)").arg(product).arg(serial);
if((res = rtlsdr_set_sample_rate(m_dev, 1536000)) < 0) {
qCritical("could not set sample rate: %s", strerror(errno));
goto failed;
}
if((res = rtlsdr_set_tuner_gain_mode(m_dev, 1)) < 0) {
qCritical("error setting tuner gain mode");
goto failed;
}
if((res = rtlsdr_set_agc_mode(m_dev, 0)) < 0) {
qCritical("error setting agc mode");
goto failed;
}
numberOfGains = rtlsdr_get_tuner_gains(m_dev, NULL);
if(numberOfGains < 0) {
qCritical("error getting number of gain values supported");
goto failed;
}
m_gains.resize(numberOfGains);
if(rtlsdr_get_tuner_gains(m_dev, &m_gains[0]) < 0) {
qCritical("error getting gain values");
goto failed;
}
if((res = rtlsdr_reset_buffer(m_dev)) < 0) {
qCritical("could not reset USB EP buffers: %s", strerror(errno));
goto failed;
}
if((m_V4LThread = new V4LThread(m_dev, &m_sampleFifo)) == NULL) {
qFatal("out of memory");
goto failed;
}
m_V4LThread->startWork();
mutexLocker.unlock();
applySettings(m_generalSettings, m_settings, true);
qDebug("RTLSDRInput: start");
MsgReportV4L::create(m_gains)->submit(m_guiMessageQueue);
return true;
failed:
stopInput();
return false;
}
void V4LInput::stopInput()
{
QMutexLocker mutexLocker(&m_mutex);
if(m_V4LThread != NULL) {
m_V4LThread->stopWork();
delete m_V4LThread;
m_V4LThread = NULL;
}
if(m_dev != NULL) {
rtlsdr_close(m_dev);
m_dev = NULL;
}
m_deviceDescription.clear();
}
const QString& V4LInput::getDeviceDescription() const
{
return m_deviceDescription;
}
int V4LInput::getSampleRate() const
{
return 96000 * (1 << m_settings.m_decimation);
}
quint64 V4LInput::getCenterFrequency() const
{
return m_generalSettings.m_centerFrequency;
}
bool V4LInput::handleMessage(Message* message)
{
if(MsgConfigureV4L::match(message)) {
MsgConfigureV4L* conf = (MsgConfigureV4L*)message;
if(!applySettings(conf->getGeneralSettings(), conf->getSettings(), false))
qDebug("V4L config error");
message->completed();
return true;
} else {
return false;
}
}
bool V4LInput::applySettings(const GeneralSettings& generalSettings, const Settings& settings, bool force)
{
QMutexLocker mutexLocker(&m_mutex);
if((m_generalSettings.m_centerFrequency != generalSettings.m_centerFrequency) || force) {
m_generalSettings.m_centerFrequency = generalSettings.m_centerFrequency;
if(m_dev != NULL) {
if(rtlsdr_set_center_freq(m_dev, m_generalSettings.m_centerFrequency
+ 384000) != 0)
qDebug("osmosdr_set_center_freq(%lld) failed", m_generalSettings.m_centerFrequency);
}
}
if((m_settings.m_gain != settings.m_gain) || force) {
m_settings.m_gain = settings.m_gain;
if(m_dev != NULL) {
if(rtlsdr_set_tuner_gain(m_dev, m_settings.m_gain) != 0)
qDebug("rtlsdr_set_tuner_gain() failed");
}
}
if((m_settings.m_decimation != settings.m_decimation) || force) {
m_settings.m_decimation = settings.m_decimation;
if(m_dev != NULL)
m_V4LThread->setDecimation(m_settings.m_decimation);
}
return true;
}

105
plugins/samplesource/v4l/v4linput.h Normal file
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///////////////////////////////////////////////////////////////////////////////////
// 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_V4LINPUT_H
#define INCLUDE_V4LINPUT_H
#include "dsp/samplesource/samplesource.h"
#include <rtl-sdr.h>
#include <QString>
class V4LThread;
class V4LInput : public SampleSource {
public:
struct Settings {
qint32 m_gain;
qint32 m_decimation;
Settings();
void resetToDefaults();
QByteArray serialize() const;
bool deserialize(const QByteArray& data);
};
class MsgConfigureV4L : public Message {
MESSAGE_CLASS_DECLARATION
public:
const GeneralSettings& getGeneralSettings() const { return m_generalSettings; }
const Settings& getSettings() const { return m_settings; }
static MsgConfigureV4L* create(const GeneralSettings& generalSettings, const Settings& settings)
{
return new MsgConfigureV4L(generalSettings, settings);
}
private:
GeneralSettings m_generalSettings;
Settings m_settings;
MsgConfigureV4L(const GeneralSettings& generalSettings, const Settings& settings) :
Message(),
m_generalSettings(generalSettings),
m_settings(settings)
{ }
};
class MsgReportV4L : public Message {
MESSAGE_CLASS_DECLARATION
public:
const std::vector<int>& getGains() const { return m_gains; }
static MsgReportV4L* create(const std::vector<int>& gains)
{
return new MsgReportV4L(gains);
}
protected:
std::vector<int> m_gains;
MsgReportV4L(const std::vector<int>& gains) :
Message(),
m_gains(gains)
{ }
};
V4LInput(MessageQueue* msgQueueToGUI);
~V4LInput();
bool startInput(int device);
void stopInput();
const QString& getDeviceDescription() const;
int getSampleRate() const;
quint64 getCenterFrequency() const;
bool handleMessage(Message* message);
private:
QMutex m_mutex;
Settings m_settings;
rtlsdr_dev_t* m_dev;
V4LThread* m_V4LThread;
QString m_deviceDescription;
std::vector<int> m_gains;
bool applySettings(const GeneralSettings& generalSettings, const Settings& settings, bool force);
};
#endif // INCLUDE_V4L_H

67
plugins/samplesource/v4l/v4lplugin.cpp Normal file
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#include <QtPlugin>
#include <QAction>
#include <rtl-sdr.h>
#include "plugin/pluginapi.h"
#include "util/simpleserializer.h"
#include "v4lplugin.h"
#include "v4lgui.h"
const PluginDescriptor V4LPlugin::m_pluginDescriptor = {
QString("V4L Input"),
QString("---"),
QString("(c) librtlsdr authors"),
QString("http://sdr.osmocom.org/trac/wiki/rtl-sdr"),
true,
QString("http://cgit.osmocom.org/cgit/rtl-sdr")
};
V4LPlugin::V4LPlugin(QObject* parent) :
QObject(parent)
{
}
const PluginDescriptor& V4LPlugin::getPluginDescriptor() const
{
return m_pluginDescriptor;
}
void V4LPlugin::initPlugin(PluginAPI* pluginAPI)
{
m_pluginAPI = pluginAPI;
m_pluginAPI->registerSampleSource("org.osmocom.sdr.samplesource.v4l", this);
}
PluginInterface::SampleSourceDevices V4LPlugin::enumSampleSources()
{
SampleSourceDevices result;
int count = rtlsdr_get_device_count();
char vendor[256];
char product[256];
char serial[256];
for(int i = 0; i < count; i++) {
vendor[0] = '\0';
product[0] = '\0';
serial[0] = '\0';
if(rtlsdr_get_device_usb_strings((uint32_t)i, vendor, product, serial) != 0)
continue;
QString displayedName(QString("RTL-SDR #%1 (%2 #%3)").arg(i + 1).arg(product).arg(serial));
SimpleSerializer s(1);
s.writeS32(1, i);
result.append(SampleSourceDevice(displayedName, "org.osmocom.sdr.samplesource.v4l", s.final()));
}
return result;
}
PluginGUI* V4LPlugin::createSampleSource(const QString& sourceName, const QByteArray& address)
{
if(sourceName == "org.osmocom.sdr.samplesource.v4l") {
V4LGui* gui = new V4LGui(m_pluginAPI);
m_pluginAPI->setInputGUI(gui);
return gui;
} else {
return NULL;
}
}

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plugins/samplesource/v4l/v4lplugin.h Normal file
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#ifndef INCLUDE_V4LPLUGIN_H
#define INCLUDE_V4LPLUGIN_H
#include <QObject>
#include "plugin/plugininterface.h"
class V4LPlugin : public QObject, PluginInterface {
Q_OBJECT
Q_INTERFACES(PluginInterface)
Q_PLUGIN_METADATA(IID "org.osmocom.sdr.samplesource.v4l")
public:
explicit V4LPlugin(QObject* parent = NULL);
const PluginDescriptor& getPluginDescriptor() const;
void initPlugin(PluginAPI* pluginAPI);
SampleSourceDevices enumSampleSources();
PluginGUI* createSampleSource(const QString& sourceName, const QByteArray& address);
private:
static const PluginDescriptor m_pluginDescriptor;
PluginAPI* m_pluginAPI;
};
#endif // INCLUDE_V4LPLUGIN_H

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plugins/samplesource/v4l/v4lthread.cpp Normal file
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///////////////////////////////////////////////////////////////////////////////////
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <errno.h>
#include "v4lthread.h"
#include "dsp/samplefifo.h"
#define BLOCKSIZE 16384
V4LThread::V4LThread(rtlsdr_dev_t* dev, SampleFifo* sampleFifo, QObject* parent) :
QThread(parent),
m_running(false),
m_dev(dev),
m_convertBuffer(BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_decimation(2)
{
m_localdecimation = 0;
}
V4LThread::~V4LThread()
{
stopWork();
}
void V4LThread::startWork()
{
m_startWaitMutex.lock();
start();
while(!m_running)
m_startWaiter.wait(&m_startWaitMutex, 100);
m_startWaitMutex.unlock();
}
void V4LThread::stopWork()
{
m_running = false;
wait();
}
void V4LThread::setDecimation(int decimation)
{
m_decimation = decimation;
}
void V4LThread::run()
{
int res;
m_running = true;
m_startWaiter.wakeAll();
while(m_running) {
if((res = rtlsdr_read_async(m_dev, &V4LThread::callbackHelper, this, 32, BLOCKSIZE)) < 0) {
qCritical("V4LThread: async error: %s", strerror(errno));
break;
}
}
m_running = false;
}
void V4LThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len + 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3];
yimag = buf[pos+1] + buf[pos+2] - 255;
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
xreal = buf[pos+7] - buf[pos+4];
yimag = 255 - buf[pos+5] - buf[pos+6];
Sample t( xreal << 3, yimag << 3 );
**it = t;
(*it)++;
}
}
void V4LThread::decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len + 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void V4LThread::decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len + 15; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
pos += 8;
xreal += buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag += buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void V4LThread::decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
// Offset tuning: 4x downsample and rotate, then
// downsample 4x more. [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
qint16 xreal, yimag;
for (int step = 0; step < len - 31; step +=32) {
xreal = yimag = 0;
for (int pos = step; pos < step + 32; pos += 8) {
xreal += buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag += buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
}
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void V4LThread::callback(const quint8* buf, qint32 len)
{
qint16 xreal, yimag, phase;
SampleVector::iterator it = m_convertBuffer.begin();
int decimationFactor[] = {1, 1, 1, 2, 4, 0};
if (++m_localdecimation < decimationFactor[m_decimation]) return;
m_localdecimation = 0;
switch(4 - m_decimation) {
case 0: // 1:1 = no decimation
// just rotation
phase = -(1<<2);
for (int pos = 0; pos < len + 3; pos += 4) {
phase *= -1;
xreal = phase * (2 * buf[pos+0] - 255);
yimag = phase * (2 * buf[pos+1] - 255);
*it++ = Sample(xreal, yimag);
xreal = phase * (255 - 2 * buf[pos+3]);
yimag = phase * (2 * buf[pos+2] - 255);
*it++ = Sample(xreal, yimag);
}
break;
case 1: // 1:2
decimate2(&it, buf, len);
break;
case 2: // 1:4
decimate4(&it, buf, len);
break;
case 3: // 1:8
decimate8(&it, buf, len);
break;
default:
case 4: // 1:16
decimate16(&it, buf, len);
break;
}
m_sampleFifo->write(m_convertBuffer.begin(), it);
if(!m_running)
rtlsdr_cancel_async(m_dev);
}
void V4LThread::callbackHelper(unsigned char* buf, uint32_t len, void* ctx)
{
V4LThread* thread = (V4LThread*)ctx;
thread->callback(buf, len);
}

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///////////////////////////////////////////////////////////////////////////////////
// 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_V4LTHREAD_H
#define INCLUDE_V4LTHREAD_H
#include <QThread>
#include <QMutex>
#include <QWaitCondition>
#include <rtl-sdr.h>
#include "dsp/samplefifo.h"
#include "dsp/inthalfbandfilter.h"
class V4LThread : public QThread {
Q_OBJECT
public:
V4LThread(rtlsdr_dev_t* dev, SampleFifo* sampleFifo, QObject* parent = NULL);
~V4LThread();
void startWork();
void stopWork();
void setDecimation(int decimation);
private:
QMutex m_startWaitMutex;
QWaitCondition m_startWaiter;
bool m_running;
rtlsdr_dev_t* m_dev;
SampleVector m_convertBuffer;
SampleFifo* m_sampleFifo;
int m_decimation;
int m_localdecimation;
void run();
void decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len);
void callback(const quint8* buf, qint32 len);
static void callbackHelper(unsigned char* buf, uint32_t len, void* ctx);
};
#endif // INCLUDE_V4LTHREAD_H