SkadiLabs/gstreamerViewer
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add image rotation and flipping

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This commit is contained in:
Maik Jurischka
2025-12-19 09:31:37 +01:00
parent bef80372b6
commit 705519ec39
4 changed files with 110 additions and 6 deletions
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5
cameracontrolwidget.cpp
View File

@@ -31,6 +31,7 @@ void CameraControlWidget::setupUI()
scrollWidget->setLayout(scrollLayout);
scrollArea->setWidget(scrollWidget);
scrollWidget->setMaximumWidth(500);
mainLayout->addWidget(scrollArea);
@@ -48,6 +49,8 @@ QGroupBox* CameraControlWidget::createFormatGroup()
m_formatCombo = new QComboBox(this);
m_formatCombo->addItem("1280x720@30fps UYVY (Supported)", "1280,720,30,UYVY");
m_formatCombo->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLengthWithIcon);
m_formatCombo->setMinimumContentsLength(20);
m_getFormatsBtn = new QPushButton("Get Available Formats", this);
m_setFormatBtn = new QPushButton("Set Format", this);
@@ -221,7 +224,7 @@ void CameraControlWidget::onGetFormats()
QString format = fmt["format"].toString();
QString displayText = QString("%1x%2@%3fps %4").arg(width, height, fps).arg(format);
QString data = QString("%1,%2,%3,%4").arg(width, height, fps).arg(format);
QString data = QString("%1,%2,%3,%4").arg(width).arg(height).arg(fps).arg(format);
m_formatCombo->addItem(displayText, data);
}

8
gstreamerpipelinewidget.cpp
View File

@@ -41,6 +41,8 @@ void GStreamerPipelineWidget::setupUI()
auto* formatLabel = new QLabel("Video Format:", this);
m_formatCombo = new QComboBox(this);
m_formatCombo->addItem("1280x720@30fps UYVY (Default/Supported)", "1280,720,30,UYVY");
m_formatCombo->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLengthWithIcon);
m_formatCombo->setMinimumContentsLength(20);
groupLayout->addWidget(formatLabel);
groupLayout->addWidget(m_formatCombo);
@@ -54,6 +56,8 @@ void GStreamerPipelineWidget::setupUI()
m_pipelinePresets->addItem("TCP H.264 Stream", "videoconvert ! x264enc ! h264parse ! mpegtsmux ! tcpserversink host=0.0.0.0 port=5000");
m_pipelinePresets->addItem("MJPEG HTTP Stream", "videoconvert ! jpegenc ! multipartmux ! tcpserversink host=0.0.0.0 port=8080");
m_pipelinePresets->addItem("Save to File", "videoconvert ! x264enc ! mp4mux ! filesink location=/tmp/output.mp4");
m_pipelinePresets->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLengthWithIcon);
m_pipelinePresets->setMinimumContentsLength(25);
connect(m_pipelinePresets, QOverload<int>::of(&QComboBox::currentIndexChanged),
this, &GStreamerPipelineWidget::onPipelinePresetChanged);
@@ -91,6 +95,8 @@ void GStreamerPipelineWidget::setupUI()
m_statusLabel->setStyleSheet("QLabel { background-color: #f0f0f0; padding: 5px; border-radius: 3px; }");
groupLayout->addWidget(m_statusLabel);
groupBox->setMaximumWidth(500);
mainLayout->addWidget(groupBox);
mainLayout->addStretch();
@@ -305,7 +311,7 @@ void GStreamerPipelineWidget::onFormatsReceived(const QJsonObject& response)
QString format = fmt["format"].toString();
QString displayText = QString("%1x%2@%3fps %4").arg(width, height, fps).arg(format);
QString data = QString("%1,%2,%3,%4").arg(width, height, fps).arg(format);
QString data = QString("%1,%2,%3,%4").arg(width).arg(height).arg(fps).arg(format);
m_formatCombo->addItem(displayText, data);
}

91
videoviewerwidget.cpp
View File

@@ -5,6 +5,7 @@
#include <QGroupBox>
#include <QDebug>
#include <QPixmap>
#include <QTransform>
#include <gst/video/video.h>
VideoViewerWidget::VideoViewerWidget(QWidget *parent)
@@ -19,10 +20,16 @@ VideoViewerWidget::VideoViewerWidget(QWidget *parent)
m_statusLabel(nullptr),
m_zoomSlider(nullptr),
m_zoomLabel(nullptr),
m_rotationCombo(nullptr),
m_flipHorizontal(nullptr),
m_flipVertical(nullptr),
m_pipeline(nullptr),
m_appSink(nullptr),
m_zoomFactor(1.0),
m_busWatchId(0)
m_busWatchId(0),
m_rotationAngle(0),
m_flipHorizontalEnabled(false),
m_flipVerticalEnabled(false)
{
initGStreamer();
setupUI();
@@ -77,6 +84,30 @@ void VideoViewerWidget::setupUI()
zoomLayout->addWidget(m_zoomSlider);
zoomLayout->addWidget(m_zoomLabel);
auto* transformLayout = new QHBoxLayout();
transformLayout->addWidget(new QLabel("Rotation:", this));
m_rotationCombo = new QComboBox(this);
m_rotationCombo->addItem("0°", 0);
m_rotationCombo->addItem("90°", 90);
m_rotationCombo->addItem("180°", 180);
m_rotationCombo->addItem("270°", 270);
m_rotationCombo->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
m_rotationCombo->setMinimumWidth(70);
connect(m_rotationCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
this, &VideoViewerWidget::onRotationChanged);
transformLayout->addWidget(m_rotationCombo);
m_flipHorizontal = new QCheckBox("Flip H", this);
connect(m_flipHorizontal, &QCheckBox::checkStateChanged, this, &VideoViewerWidget::onFlipHorizontalChanged);
transformLayout->addWidget(m_flipHorizontal);
m_flipVertical = new QCheckBox("Flip V", this);
connect(m_flipVertical, &QCheckBox::checkStateChanged, this, &VideoViewerWidget::onFlipVerticalChanged);
transformLayout->addWidget(m_flipVertical);
transformLayout->addStretch();
auto* controlGroup = new QGroupBox("Viewer Controls", this);
auto* controlLayout = new QVBoxLayout();
@@ -88,9 +119,11 @@ void VideoViewerWidget::setupUI()
m_sourceType->addItem("TCP H.264 Stream", "tcp");
m_sourceType->addItem("MJPEG HTTP Stream", "http");
m_sourceType->addItem("Test Pattern", "test");
m_sourceType->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLengthWithIcon);
m_sourceType->setMinimumContentsLength(15);
connect(m_sourceType, QOverload<int>::of(&QComboBox::currentIndexChanged),
this, &VideoViewerWidget::onSourceTypeChanged);
sourceLayout->addWidget(m_sourceType);
sourceLayout->addWidget(m_sourceType, 1);
auto* formLayout = new QFormLayout();
m_hostEdit = new QLineEdit("127.0.0.1", this);
@@ -117,9 +150,11 @@ void VideoViewerWidget::setupUI()
controlLayout->addLayout(buttonLayout);
controlLayout->addWidget(m_statusLabel);
controlGroup->setLayout(controlLayout);
controlGroup->setMaximumWidth(500);
mainLayout->addWidget(m_scrollArea, 1);
mainLayout->addLayout(zoomLayout);
mainLayout->addLayout(transformLayout);
mainLayout->addWidget(controlGroup);
setLayout(mainLayout);
@@ -352,6 +387,33 @@ void VideoViewerWidget::onZoomChanged(int value)
}
}
void VideoViewerWidget::onRotationChanged(int index)
{
m_rotationAngle = m_rotationCombo->currentData().toInt();
if (!m_currentFrame.isNull()) {
displayFrame(m_currentFrame);
}
}
void VideoViewerWidget::onFlipHorizontalChanged(Qt::CheckState state)
{
m_flipHorizontalEnabled = (state == Qt::Checked);
if (!m_currentFrame.isNull()) {
displayFrame(m_currentFrame);
}
}
void VideoViewerWidget::onFlipVerticalChanged(Qt::CheckState state)
{
m_flipVerticalEnabled = (state == Qt::Checked);
if (!m_currentFrame.isNull()) {
displayFrame(m_currentFrame);
}
}
GstFlowReturn VideoViewerWidget::newSampleCallback(GstAppSink* appsink, gpointer user_data)
{
static int callbackCount = 0;
@@ -453,13 +515,34 @@ void VideoViewerWidget::displayFrame(const QImage& frame)
m_currentFrame = frame;
QPixmap pixmap = QPixmap::fromImage(frame);
QImage transformedFrame = frame;
// Apply rotation
if (m_rotationAngle != 0) {
QTransform rotation;
rotation.rotate(m_rotationAngle);
transformedFrame = transformedFrame.transformed(rotation, Qt::SmoothTransformation);
}
// Apply flipping
if (m_flipHorizontalEnabled || m_flipVerticalEnabled) {
Qt::Orientations orientations;
if (m_flipHorizontalEnabled) {
orientations |= Qt::Horizontal;
}
if (m_flipVerticalEnabled) {
orientations |= Qt::Vertical;
}
transformedFrame = transformedFrame.flipped(orientations);
}
QPixmap pixmap = QPixmap::fromImage(transformedFrame);
if (pixmap.isNull()) {
qDebug() << "[VideoViewer] ERROR: Pixmap conversion failed!";
return;
}
QSize targetSize = frame.size() * m_zoomFactor;
QSize targetSize = transformedFrame.size() * m_zoomFactor;
QPixmap scaledPixmap = pixmap.scaled(targetSize,
Qt::KeepAspectRatio,

12
videoviewerwidget.h
View File

@@ -9,6 +9,7 @@
#include <QImage>
#include <QSlider>
#include <QScrollArea>
#include <QCheckBox>
#include <gst/gst.h>
#include <gst/app/gstappsink.h>
@@ -28,6 +29,9 @@ private slots:
void onStopViewer();
void onSourceTypeChanged(int index);
void onZoomChanged(int value);
void onRotationChanged(int index);
void onFlipHorizontalChanged(Qt::CheckState state);
void onFlipVerticalChanged(Qt::CheckState state);
void displayFrame(const QImage& frame);
private:
@@ -52,6 +56,9 @@ private:
QLabel* m_statusLabel;
QSlider* m_zoomSlider;
QLabel* m_zoomLabel;
QComboBox* m_rotationCombo;
QCheckBox* m_flipHorizontal;
QCheckBox* m_flipVertical;
// GStreamer elements (8-byte pointers)
GstElement* m_pipeline;
@@ -63,6 +70,11 @@ private:
// Bus watch ID (4-byte unsigned int)
guint m_busWatchId;
// Transformation settings (4 bytes + 2 bytes)
int m_rotationAngle;
bool m_flipHorizontalEnabled;
bool m_flipVerticalEnabled;
// Video state (large object at end)
QImage m_currentFrame;
};