libcamera/vivid.git - libcamera pipeline handler for VIVID

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author	Daniel Semkowicz <dse@thaumatec.com>	2022-06-17 16:35:49 +0200
committer	Laurent Pinchart <laurent.pinchart@ideasonboard.com>	2022-06-17 18:08:55 +0300
commit	d2c097c4828e15821b6d14b101f2d627f2371c39 (patch)
tree	6d9be1bcbbed1601283ea1a5cb2996bc288bb37f /src/qcam/assets/feathericons/tv.svg
parent	d85a91cf56a68cea30019362f1206dcebce3db23 (diff)

Documentation: Update the "Start an event loop" section

Event loop was moved to be a part of CameraManager, so it is no longer a user responsibility to control the event dispatching. Signed-off-by: Daniel Semkowicz <dse@thaumatec.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Diffstat (limited to 'src/qcam/assets/feathericons/tv.svg')

0 files changed, 0 insertions, 0 deletions

/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2019, Google Inc. * * main_window.cpp - qcam - Main application window */ #include "main_window.h" #include <assert.h> #include <iomanip> #include <string> #include <QComboBox> #include <QCoreApplication> #include <QFileDialog> #include <QImage> #include <QImageWriter> #include <QInputDialog> #include <QMutexLocker> #include <QStandardPaths> #include <QStringList> #include <QTimer> #include <QToolBar> #include <QToolButton> #include <QtDebug> #include <libcamera/camera_manager.h> #include <libcamera/version.h> #include "../cam/image.h" #include "dng_writer.h" #ifndef QT_NO_OPENGL #include "viewfinder_gl.h" #endif #include "viewfinder_qt.h" using namespace libcamera; #if QT_VERSION < QT_VERSION_CHECK(5, 14, 0) /* * Qt::fixed was introduced in v5.14, and ::fixed deprecated in v5.15. Allow * usage of Qt::fixed unconditionally. */ namespace Qt { constexpr auto fixed = ::fixed; } /* namespace Qt */ #endif /** * \brief Custom QEvent to signal capture completion */ class CaptureEvent : public QEvent { public: CaptureEvent() : QEvent(type()) { } static Type type() { static int type = QEvent::registerEventType(); return static_cast<Type>(type); } }; /** * \brief Custom QEvent to signal hotplug or unplug */ class HotplugEvent : public QEvent { public: enum PlugEvent { HotPlug, HotUnplug }; HotplugEvent(std::shared_ptr<Camera> camera, PlugEvent event) : QEvent(type()), camera_(std::move(camera)), plugEvent_(event) { } static Type type() { static int type = QEvent::registerEventType(); return static_cast<Type>(type); } PlugEvent hotplugEvent() const { return plugEvent_; } Camera *camera() const { return camera_.get(); } private: std::shared_ptr<Camera> camera_; PlugEvent plugEvent_; }; MainWindow::MainWindow(CameraManager *cm, const OptionsParser::Options &options) : saveRaw_(nullptr), options_(options), cm_(cm), allocator_(nullptr), isCapturing_(false), captureRaw_(false) { int ret; /* * Initialize the UI: Create the toolbar, set the window title and * create the viewfinder widget. */ createToolbars(); title_ = "QCam " + QString::fromStdString(CameraManager::version()); setWindowTitle(title_); connect(&titleTimer_, SIGNAL(timeout()), this, SLOT(updateTitle())); /* Renderer type Qt or GLES, select Qt by default. */ std::string renderType = "qt"; if (options_.isSet(OptRenderer)) renderType = options_[OptRenderer].toString(); if (renderType == "qt") { ViewFinderQt *viewfinder = new ViewFinderQt(this); connect(viewfinder, &ViewFinderQt::renderComplete, this, &MainWindow::queueRequest); viewfinder_ = viewfinder; setCentralWidget(viewfinder); #ifndef QT_NO_OPENGL } else if (renderType == "gles") { ViewFinderGL *viewfinder = new ViewFinderGL(this); connect(viewfinder, &ViewFinderGL::renderComplete, this, &MainWindow::queueRequest); viewfinder_ = viewfinder; setCentralWidget(viewfinder); #endif } else { qWarning() << "Invalid render type" << QString::fromStdString(renderType); quit(); return; } adjustSize(); /* Hotplug/unplug support */ cm_->cameraAdded.connect(this, &MainWindow::addCamera); cm_->cameraRemoved.connect(this, &MainWindow::removeCamera); /* Open the camera and start capture. */ ret = openCamera(); if (ret < 0) { quit(); return; } startStopAction_->setChecked(true); } MainWindow::~MainWindow() { if (camera_) { stopCapture(); camera_->release(); camera_.reset(); } } bool MainWindow::event(QEvent *e) { if (e->type() == CaptureEvent::type()) { processCapture(); return true; } else if (e->type() == HotplugEvent::type()) { processHotplug(static_cast<HotplugEvent *>(e)); return true; } return QMainWindow::event(e); } int MainWindow::createToolbars() { QAction *action; toolbar_ = addToolBar("Main"); /* Disable right click context menu. */ toolbar_->setContextMenuPolicy(Qt::PreventContextMenu); /* Quit action. */ action = toolbar_->addAction(QIcon::fromTheme("application-exit", QIcon(":x-circle.svg")), "Quit"); action->setShortcut(Qt::CTRL | Qt::Key_Q); connect(action, &QAction::triggered, this, &MainWindow::quit); /* Camera selector. */ cameraCombo_ = new QComboBox(); connect(cameraCombo_, QOverload<int>::of(&QComboBox::activated), this, &MainWindow::switchCamera); for (const std::shared_ptr<Camera> &cam : cm_->cameras()) cameraCombo_->addItem(QString::fromStdString(cam->id())); toolbar_->addWidget(cameraCombo_); toolbar_->addSeparator(); /* Start/Stop action. */ iconPlay_ = QIcon::fromTheme("media-playback-start", QIcon(":play-circle.svg")); iconStop_ = QIcon::fromTheme("media-playback-stop", QIcon(":stop-circle.svg")); action = toolbar_->addAction(iconPlay_, "Start Capture"); action->setCheckable(true); action->setShortcut(Qt::Key_Space); connect(action, &QAction::toggled, this, &MainWindow::toggleCapture); startStopAction_ = action; /* Save As... action. */ action = toolbar_->addAction(QIcon::fromTheme("document-save-as", QIcon(":save.svg")), "Save As..."); action->setShortcut(QKeySequence::SaveAs); connect(action, &QAction::triggered, this, &MainWindow::saveImageAs); #ifdef HAVE_DNG /* Save Raw action. */ action = toolbar_->addAction(QIcon::fromTheme("camera-photo", QIcon(":aperture.svg")), "Save Raw"); action->setEnabled(false); connect(action, &QAction::triggered, this, &MainWindow::captureRaw); saveRaw_ = action; #endif return 0; } void MainWindow::quit() { QTimer::singleShot(0, QCoreApplication::instance(), &QCoreApplication::quit); } void MainWindow::updateTitle() { /* Calculate the average frame rate over the last period. */ unsigned int duration = frameRateInterval_.elapsed(); unsigned int frames = framesCaptured_ - previousFrames_; double fps = frames * 1000.0 / duration; /* Restart counters. */ frameRateInterval_.start(); previousFrames_ = framesCaptured_; setWindowTitle(title_ + " : " + QString::number(fps, 'f', 2) + " fps"); } /* ----------------------------------------------------------------------------- * Camera Selection */ void MainWindow::switchCamera(int index) { /* Get and acquire the new camera. */ const auto &cameras = cm_->cameras(); if (static_cast<unsigned int>(index) >= cameras.size()) return; const std::shared_ptr<Camera> &cam = cameras[index]; if (cam->acquire()) { qInfo() << "Failed to acquire camera" << cam->id().c_str(); return; } qInfo() << "Switching to camera" << cam->id().c_str(); /* * Stop the capture session, release the current camera, replace it with * the new camera and start a new capture session. */ startStopAction_->setChecked(false); camera_->release(); camera_ = cam; startStopAction_->setChecked(true); } std::string MainWindow::chooseCamera() { QStringList cameras; bool result; /* If only one camera is available, use it automatically. */ if (cm_->cameras().size() == 1) return cm_->cameras()[0]->id(); /* Present a dialog box to pick a camera. */ for (const std::shared_ptr<Camera> &cam : cm_->cameras()) cameras.append(QString::fromStdString(cam->id())); QString id = QInputDialog::getItem(this, "Select Camera", "Camera:", cameras, 0, false, &result); if (!result) return std::string(); return id.toStdString(); } int MainWindow::openCamera() { std::string cameraName; /* * Use the camera specified on the command line, if any, or display the * camera selection dialog box otherwise. */ if (options_.isSet(OptCamera)) cameraName = static_cast<std::string>(options_[OptCamera]); else cameraName = chooseCamera(); if (cameraName == "") return -EINVAL; /* Get and acquire the camera. */ camera_ = cm_->get(cameraName); if (!camera_) { qInfo() << "Camera" << cameraName.c_str() << "not found"; return -ENODEV; } if (camera_->acquire()) { qInfo() << "Failed to acquire camera"; camera_.reset(); return -EBUSY; } /* Set the combo-box entry with the currently selected Camera. */ cameraCombo_->setCurrentText(QString::fromStdString(cameraName)); return 0; } /* ----------------------------------------------------------------------------- * Capture Start & Stop */ void MainWindow::toggleCapture(bool start) { if (start) { startCapture(); startStopAction_->setIcon(iconStop_); startStopAction_->setText("Stop Capture"); } else { stopCapture(); startStopAction_->setIcon(iconPlay_); startStopAction_->setText("Start Capture"); } } /** * \brief Start capture with the current camera * * This function shall not be called directly, use toggleCapture() instead. */ int MainWindow::startCapture() { StreamRoles roles = StreamKeyValueParser::roles(options_[OptStream]); int ret; /* Verify roles are supported. */ switch (roles.size()) { case 1: if (roles[0] != StreamRole::Viewfinder) { qWarning() << "Only viewfinder supported for single stream"; return -EINVAL; } break; case 2: if (roles[0] != StreamRole::Viewfinder || roles[1] != StreamRole::Raw) { qWarning() << "Only viewfinder + raw supported for dual streams"; return -EINVAL; } break; default: if (roles.size() != 1) { qWarning() << "Unsupported stream configuration"; return -EINVAL; } break; } /* Configure the camera. */ config_ = camera_->generateConfiguration(roles); if (!config_) { qWarning() << "Failed to generate configuration from roles"; return -EINVAL; } StreamConfiguration &vfConfig = config_->at(0); /* Use a format supported by the viewfinder if available. */ std::vector<PixelFormat> formats = vfConfig.formats().pixelformats(); for (const PixelFormat &format : viewfinder_->nativeFormats()) { auto match = std::find_if(formats.begin(), formats.end(), [&](const PixelFormat &f) { return f == format; }); if (match != formats.end()) { vfConfig.pixelFormat = format; break; } } /* Allow user to override configuration. */ if (StreamKeyValueParser::updateConfiguration(config_.get(), options_[OptStream])) { qWarning() << "Failed to update configuration"; return -EINVAL; } CameraConfiguration::Status validation = config_->validate(); if (validation == CameraConfiguration::Invalid) { qWarning() << "Failed to create valid camera configuration"; return -EINVAL; } if (validation == CameraConfiguration::Adjusted) qInfo() << "Stream configuration adjusted to " << vfConfig.toString().c_str(); ret = camera_->configure(config_.get()); if (ret < 0) { qInfo() << "Failed to configure camera"; return ret; } /* Store stream allocation. */ vfStream_ = config_->at(0).stream(); if (config_->size() == 2) rawStream_ = config_->at(1).stream(); else rawStream_ = nullptr; /* Configure the viewfinder. */ ret = viewfinder_->setFormat(vfConfig.pixelFormat, QSize(vfConfig.size.width, vfConfig.size.height), vfConfig.stride); if (ret < 0) { qInfo() << "Failed to set viewfinder format"; return ret; } adjustSize(); /* Configure the raw capture button. */ if (saveRaw_) saveRaw_->setEnabled(config_->size() == 2); /* Allocate and map buffers. */ allocator_ = new FrameBufferAllocator(camera_); for (StreamConfiguration &config : *config_) { Stream *stream = config.stream(); ret = allocator_->allocate(stream); if (ret < 0) { qWarning() << "Failed to allocate capture buffers"; goto error; } for (const std::unique_ptr<FrameBuffer> &buffer : allocator_->buffers(stream)) { /* Map memory buffers and cache the mappings. */ std::unique_ptr<Image> image = Image::fromFrameBuffer(buffer.get(), Image::MapMode::ReadOnly); assert(image != nullptr); mappedBuffers_[buffer.get()] = std::move(image); /* Store buffers on the free list. */ freeBuffers_[stream].enqueue(buffer.get()); } } /* Create requests and fill them with buffers from the viewfinder. */ while (!freeBuffers_[vfStream_].isEmpty()) { FrameBuffer *buffer = freeBuffers_[vfStream_].dequeue(); std::unique_ptr<Request> request = camera_->createRequest(); if (!request) { qWarning() << "Can't create request"; ret = -ENOMEM; goto error; } ret = request->addBuffer(vfStream_, buffer); if (ret < 0) { qWarning() << "Can't set buffer for request"; goto error; } requests_.push_back(std::move(request)); } /* Start the title timer and the camera. */ titleTimer_.start(2000); frameRateInterval_.start(); previousFrames_ = 0; framesCaptured_ = 0; lastBufferTime_ = 0; ret = camera_->start(); if (ret) { qInfo() << "Failed to start capture"; goto error; } camera_->requestCompleted.connect(this, &MainWindow::requestComplete); /* Queue all requests. */ for (std::unique_ptr<Request> &request : requests_) { ret = camera_->queueRequest(request.get()); if (ret < 0) { qWarning() << "Can't queue request"; goto error_disconnect; } } isCapturing_ = true; return 0; error_disconnect: camera_->requestCompleted.disconnect(this); camera_->stop(); error: requests_.clear(); mappedBuffers_.clear(); freeBuffers_.clear(); delete allocator_; allocator_ = nullptr; return ret; } /** * \brief Stop ongoing capture * * This function may be called directly when tearing down the MainWindow. Use * toggleCapture() instead in all other cases. */ void MainWindow::stopCapture() { if (!isCapturing_) return; viewfinder_->stop(); if (saveRaw_) saveRaw_->setEnabled(false); captureRaw_ = false; int ret = camera_->stop(); if (ret) qInfo() << "Failed to stop capture"; camera_->requestCompleted.disconnect(this); mappedBuffers_.clear(); requests_.clear(); freeQueue_.clear(); delete allocator_; isCapturing_ = false; config_.reset(); /* * A CaptureEvent may have been posted before we stopped the camera, * but not processed yet. Clear the queue of done buffers to avoid * racing with the event handler. */ freeBuffers_.clear(); doneQueue_.clear(); titleTimer_.stop(); setWindowTitle(title_); } /* ----------------------------------------------------------------------------- * Camera hotplugging support */ void MainWindow::processHotplug(HotplugEvent *e) { Camera *camera = e->camera(); HotplugEvent::PlugEvent event = e->hotplugEvent(); if (event == HotplugEvent::HotPlug) { cameraCombo_->addItem(QString::fromStdString(camera->id())); } else if (event == HotplugEvent::HotUnplug) { /* Check if the currently-streaming camera is removed. */ if (camera == camera_.get()) { toggleCapture(false); camera_->release(); camera_.reset(); cameraCombo_->setCurrentIndex(0); } int camIndex = cameraCombo_->findText(QString::fromStdString(camera->id())); cameraCombo_->removeItem(camIndex); } } void MainWindow::addCamera(std::shared_ptr<Camera> camera) { qInfo() << "Adding new camera:" << camera->id().c_str(); QCoreApplication::postEvent(this,


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