diff options
Diffstat (limited to 'examples/multimedia/video/snippets/frequencymonitor')
6 files changed, 512 insertions, 0 deletions
diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp new file mode 100644 index 000000000..1d44f1297 --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp @@ -0,0 +1,250 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "frequencymonitor.h" +#include <QtCore/QDebug> +#include <QtCore/QElapsedTimer> +#include <QtCore/QString> +#include <QtCore/QTime> +#include <QtCore/QTimer> + +//#define VERBOSE_TRACE + +inline QDebug qtTrace() { return qDebug() << "[frequencymonitor]"; } +#ifdef VERBOSE_TRACE +inline QDebug qtVerboseTrace() { return qtTrace(); } +#else +inline QNoDebug qtVerboseTrace() { return QNoDebug(); } +#endif + +static const int DefaultSamplingInterval = 100; +static const int DefaultTraceInterval = 0; + +class FrequencyMonitorPrivate : public QObject +{ + Q_OBJECT +public: + FrequencyMonitorPrivate(FrequencyMonitor *parent); + void calculateInstantaneousFrequency(); + +private slots: + void calculateAverageFrequency(); + void stalled(); + +public: + FrequencyMonitor *const q_ptr; + QString m_label; + bool m_active; + qreal m_instantaneousFrequency; + QElapsedTimer m_instantaneousElapsed; + QTimer *m_averageTimer; + QElapsedTimer m_averageElapsed; + int m_count; + qreal m_averageFrequency; + QTimer *m_traceTimer; + QTimer *m_stalledTimer; +}; + +FrequencyMonitorPrivate::FrequencyMonitorPrivate(FrequencyMonitor *parent) +: QObject(parent) +, q_ptr(parent) +, m_active(false) +, m_instantaneousFrequency(0) +, m_averageTimer(new QTimer(this)) +, m_count(0) +, m_averageFrequency(0) +, m_traceTimer(new QTimer(this)) +, m_stalledTimer(new QTimer(this)) +{ + m_instantaneousElapsed.start(); + connect(m_averageTimer, SIGNAL(timeout()), + this, SLOT(calculateAverageFrequency())); + if (DefaultSamplingInterval) + m_averageTimer->start(DefaultSamplingInterval); + m_averageElapsed.start(); + connect(m_traceTimer, SIGNAL(timeout()), + q_ptr, SLOT(trace())); + if (DefaultTraceInterval) + m_traceTimer->start(DefaultTraceInterval); + m_stalledTimer->setSingleShot(true); + connect(m_stalledTimer, SIGNAL(timeout()), + this, SLOT(stalled())); +} + +void FrequencyMonitorPrivate::calculateInstantaneousFrequency() +{ + const qint64 ms = m_instantaneousElapsed.restart(); + m_instantaneousFrequency = ms ? qreal(1000) / ms : 0; + m_stalledTimer->start(3 * ms); + if (m_instantaneousFrequency) + q_ptr->setActive(true); + q_ptr->emit instantaneousFrequencyChanged(m_instantaneousFrequency); + q_ptr->emit frequencyChanged(); +} + +void FrequencyMonitorPrivate::calculateAverageFrequency() +{ + const qint64 ms = m_averageElapsed.restart(); + m_averageFrequency = qreal(m_count * 1000) / ms; + q_ptr->emit averageFrequencyChanged(m_averageFrequency); + q_ptr->emit frequencyChanged(); + m_count = 0; +} + +void FrequencyMonitorPrivate::stalled() +{ + if (m_instantaneousFrequency) { + qtVerboseTrace() << "FrequencyMonitor::stalled"; + m_instantaneousFrequency = 0; + q_ptr->emit instantaneousFrequencyChanged(m_instantaneousFrequency); + q_ptr->emit frequencyChanged(); + } +} + +FrequencyMonitor::FrequencyMonitor(QObject *parent) +: QObject(parent) +, d_ptr(0) +{ + d_ptr = new FrequencyMonitorPrivate(this); + qtTrace() << "FrequencyMonitor::FrequencyMonitor"; +} + +FrequencyMonitor::~FrequencyMonitor() +{ + +} + +const QString &FrequencyMonitor::label() const +{ + return d_func()->m_label; +} + +bool FrequencyMonitor::active() const +{ + return d_func()->m_active; +} + +int FrequencyMonitor::samplingInterval() const +{ + return d_ptr->m_averageTimer->isActive() ? d_ptr->m_averageTimer->interval() : 0; +} + +int FrequencyMonitor::traceInterval() const +{ + return d_ptr->m_traceTimer->isActive() ? d_ptr->m_traceTimer->interval() : 0; +} + +qreal FrequencyMonitor::instantaneousFrequency() const +{ + return d_func()->m_instantaneousFrequency; +} + +qreal FrequencyMonitor::averageFrequency() const +{ + return d_func()->m_averageFrequency; +} + +void FrequencyMonitor::notify() +{ + Q_D(FrequencyMonitor); + ++(d->m_count); + d->calculateInstantaneousFrequency(); +} + +void FrequencyMonitor::trace() +{ + Q_D(FrequencyMonitor); + const QString value = QString::fromLatin1("instant %1 average %2") + .arg(d->m_instantaneousFrequency, 0, 'f', 2) + .arg(d->m_averageFrequency, 0, 'f', 2); + if (d->m_label.isEmpty()) + qtTrace() << "FrequencyMonitor::trace" << value; + else + qtTrace() << "FrequencyMonitor::trace" << "label" << d->m_label << value; +} + +void FrequencyMonitor::setLabel(const QString &value) +{ + Q_D(FrequencyMonitor); + if (d->m_label != value) { + d->m_label = value; + emit labelChanged(d->m_label); + } +} + +void FrequencyMonitor::setActive(bool value) +{ + Q_D(FrequencyMonitor); + if (d->m_active != value) { + d->m_active = value; + emit activeChanged(d->m_active); + } +} + +void FrequencyMonitor::setSamplingInterval(int value) +{ + Q_D(FrequencyMonitor); + if (samplingInterval() != value) { + if (value) { + d->m_averageTimer->setInterval(value); + d->m_averageTimer->start(); + } else { + d->m_averageTimer->stop(); + } + emit samplingIntervalChanged(value); + } +} + +void FrequencyMonitor::setTraceInterval(int value) +{ + Q_D(FrequencyMonitor); + if (traceInterval() != value) { + if (value) { + d->m_traceTimer->setInterval(value); + d->m_traceTimer->start(); + } else { + d->m_traceTimer->stop(); + } + emit traceIntervalChanged(value); + } +} + +#include "frequencymonitor.moc" diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h new file mode 100644 index 000000000..1efd8b3ad --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h @@ -0,0 +1,101 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef FREQUENCYMONITOR_H +#define FREQUENCYMONITOR_H + +#include <QtCore/QObject> +#include <QtCore/QTimer> + +class FrequencyMonitorPrivate; + +/** + * Class for measuring frequency of events + * + * Occurrence of the event is notified by the client via the notify() slot. + * On a regular interval, both an instantaneous and a rolling average + * event frequency are calculated. + */ +class FrequencyMonitor : public QObject +{ + Q_OBJECT + Q_DECLARE_PRIVATE(FrequencyMonitor) + Q_PROPERTY(QString label READ label WRITE setLabel NOTIFY labelChanged) + Q_PROPERTY(bool active READ active WRITE setActive NOTIFY activeChanged) + Q_PROPERTY(int samplingInterval READ samplingInterval WRITE setSamplingInterval NOTIFY samplingIntervalChanged) + Q_PROPERTY(int traceInterval READ traceInterval WRITE setTraceInterval NOTIFY traceIntervalChanged) + Q_PROPERTY(qreal instantaneousFrequency READ instantaneousFrequency NOTIFY instantaneousFrequencyChanged) + Q_PROPERTY(qreal averageFrequency READ averageFrequency NOTIFY averageFrequencyChanged) +public: + FrequencyMonitor(QObject *parent = 0); + ~FrequencyMonitor(); + + static void qmlRegisterType(); + + const QString &label() const; + bool active() const; + int samplingInterval() const; + int traceInterval() const; + qreal instantaneousFrequency() const; + qreal averageFrequency() const; + +signals: + void labelChanged(const QString &value); + void activeChanged(bool); + void samplingIntervalChanged(int value); + void traceIntervalChanged(int value); + void frequencyChanged(); + void instantaneousFrequencyChanged(qreal value); + void averageFrequencyChanged(qreal value); + +public slots: + Q_INVOKABLE void notify(); + Q_INVOKABLE void trace(); + void setActive(bool value); + void setLabel(const QString &value); + void setSamplingInterval(int value); + void setTraceInterval(int value); + +private: + FrequencyMonitorPrivate *d_ptr; +}; + +#endif // FREQUENCYMONITOR_H diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.pri b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.pri new file mode 100644 index 000000000..3ac8a08c4 --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.pri @@ -0,0 +1,5 @@ +HEADERS += $$PWD/frequencymonitor.h +SOURCES += $$PWD/frequencymonitor.cpp +INCLUDEPATH += $$PWD +DEFINES += FREQUENCYMONITOR_SUPPORT + diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.cpp b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.cpp new file mode 100644 index 000000000..33fd9a8ca --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.cpp @@ -0,0 +1,48 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "frequencymonitor.h" +#include <QtQml/qqml.h> + +void FrequencyMonitor::qmlRegisterType() +{ + ::qmlRegisterType<FrequencyMonitor>("FrequencyMonitor", 1, 0, "FrequencyMonitor"); +} diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.pri b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.pri new file mode 100644 index 000000000..90a111cd1 --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.pri @@ -0,0 +1,3 @@ +include($$PWD/frequencymonitor.pri) +QT += qml +SOURCES += $$PWD/frequencymonitordeclarative.cpp diff --git a/examples/multimedia/video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml b/examples/multimedia/video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml new file mode 100644 index 000000000..893d2e84c --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml @@ -0,0 +1,105 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +import QtQuick 2.0 +import FrequencyMonitor 1.0 + +Rectangle { + id: root + property bool logging: true + property bool displayed: true + property bool enabled: logging || displayed + property alias active: monitor.active + property int samplingInterval: 500 + property color textColor: "yellow" + property int textSize: 20 + property alias label: monitor.label + + border.width: 1 + border.color: "yellow" + width: 5.5 * root.textSize + height: 3.0 * root.textSize + color: "black" + opacity: 0.5 + radius: 10 + visible: displayed && active + + // This should ensure that the monitor is on top of all other content + z: 999 + + function notify() { + monitor.notify() + } + + FrequencyMonitor { + id: monitor + samplingInterval: root.enabled ? root.samplingInterval : 0 + onAverageFrequencyChanged: { + if (root.logging) trace() + averageFrequencyText.text = monitor.averageFrequency.toFixed(2) + } + } + + Text { + id: labelText + anchors { + left: parent.left + top: parent.top + margins: 10 + } + color: root.textColor + font.pixelSize: 0.6 * root.textSize + text: root.label + width: root.width - 2*anchors.margins + elide: Text.ElideRight + } + + Text { + id: averageFrequencyText + anchors { + right: parent.right + bottom: parent.bottom + margins: 10 + } + color: root.textColor + font.pixelSize: root.textSize + } +} |