qt-everywhere-src-5.14.1/qtmultimedia/examples/multimediawidgets/camera/camera.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "camera.h"
 #include "ui_camera.h"
 #include "videosettings.h"
 #include "imagesettings.h"

 #include <QMediaService>
 #include <QMediaRecorder>
 #include <QCameraViewfinder>
 #include <QCameraInfo>
 #include <QMediaMetaData>

 #include <QMessageBox>
 #include <QPalette>

 #include <QtWidgets>

 Q_DECLARE_METATYPE(QCameraInfo)

 Camera::Camera() : ui(new Ui::Camera)
 {
     ui->setupUi(this);

     //Camera devices:

     QActionGroup *videoDevicesGroup = new QActionGroup(this);
     videoDevicesGroup->setExclusive(true);
     const QList<QCameraInfo> availableCameras = QCameraInfo::availableCameras();
     for (const QCameraInfo &cameraInfo : availableCameras) {
         QAction *videoDeviceAction = new QAction(cameraInfo.description(), videoDevicesGroup);
         videoDeviceAction->setCheckable(true);
         videoDeviceAction->setData(QVariant::fromValue(cameraInfo));
         if (cameraInfo == QCameraInfo::defaultCamera())
             videoDeviceAction->setChecked(true);

         ui->menuDevices->addAction(videoDeviceAction);
     }

     connect(videoDevicesGroup, &QActionGroup::triggered, this, &Camera::updateCameraDevice);
     connect(ui->captureWidget, &QTabWidget::currentChanged, this, &Camera::updateCaptureMode);

     setCamera(QCameraInfo::defaultCamera());
 }

 void Camera::setCamera(const QCameraInfo &cameraInfo)
 {
     m_camera.reset(new QCamera(cameraInfo));

     connect(m_camera.data(), &QCamera::stateChanged, this, &Camera::updateCameraState);
     connect(m_camera.data(), QOverload<QCamera::Error>::of(&QCamera::error), this, &Camera::displayCameraError);

     m_mediaRecorder.reset(new QMediaRecorder(m_camera.data()));
     connect(m_mediaRecorder.data(), &QMediaRecorder::stateChanged, this, &Camera::updateRecorderState);

     m_imageCapture.reset(new QCameraImageCapture(m_camera.data()));

     connect(m_mediaRecorder.data(), &QMediaRecorder::durationChanged, this, &Camera::updateRecordTime);
     connect(m_mediaRecorder.data(), QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
             this, &Camera::displayRecorderError);

     m_mediaRecorder->setMetaData(QMediaMetaData::Title, QVariant(QLatin1String("Test Title")));

     connect(ui->exposureCompensation, &QAbstractSlider::valueChanged, this, &Camera::setExposureCompensation);

     m_camera->setViewfinder(ui->viewfinder);

     updateCameraState(m_camera->state());
     updateLockStatus(m_camera->lockStatus(), QCamera::UserRequest);
     updateRecorderState(m_mediaRecorder->state());

     connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
     connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
     connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
     connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
             this, &Camera::displayCaptureError);

     connect(m_camera.data(), QOverload<QCamera::LockStatus, QCamera::LockChangeReason>::of(&QCamera::lockStatusChanged),
             this, &Camera::updateLockStatus);

     ui->captureWidget->setTabEnabled(0, (m_camera->isCaptureModeSupported(QCamera::CaptureStillImage)));
     ui->captureWidget->setTabEnabled(1, (m_camera->isCaptureModeSupported(QCamera::CaptureVideo)));

     updateCaptureMode();
     m_camera->start();
 }

 void Camera::keyPressEvent(QKeyEvent * event)
 {
     if (event->isAutoRepeat())
         return;

     switch (event->key()) {
     case Qt::Key_CameraFocus:
         displayViewfinder();
         m_camera->searchAndLock();
         event->accept();
         break;
     case Qt::Key_Camera:
         if (m_camera->captureMode() == QCamera::CaptureStillImage) {
             takeImage();
         } else {
             if (m_mediaRecorder->state() == QMediaRecorder::RecordingState)
                 stop();
             else
                 record();
         }
         event->accept();
         break;
     default:
         QMainWindow::keyPressEvent(event);
     }
 }

 void Camera::keyReleaseEvent(QKeyEvent *event)
 {
     if (event->isAutoRepeat())
         return;

     switch (event->key()) {
     case Qt::Key_CameraFocus:
         m_camera->unlock();
         break;
     default:
         QMainWindow::keyReleaseEvent(event);
     }
 }

 void Camera::updateRecordTime()
 {
     QString str = QString("Recorded %1 sec").arg(m_mediaRecorder->duration()/1000);
     ui->statusbar->showMessage(str);
 }

 void Camera::processCapturedImage(int requestId, const QImage& img)
 {
     Q_UNUSED(requestId);
     QImage scaledImage = img.scaled(ui->viewfinder->size(),
                                     Qt::KeepAspectRatio,
                                     Qt::SmoothTransformation);

     ui->lastImagePreviewLabel->setPixmap(QPixmap::fromImage(scaledImage));

     // Display captured image for 4 seconds.
     displayCapturedImage();
     QTimer::singleShot(4000, this, &Camera::displayViewfinder);
 }

 void Camera::configureCaptureSettings()
 {
     switch (m_camera->captureMode()) {
     case QCamera::CaptureStillImage:
         configureImageSettings();
         break;
     case QCamera::CaptureVideo:
         configureVideoSettings();
         break;
     default:
         break;
     }
 }

 void Camera::configureVideoSettings()
 {
     VideoSettings settingsDialog(m_mediaRecorder.data());
     settingsDialog.setWindowFlags(settingsDialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);

     settingsDialog.setAudioSettings(m_audioSettings);
     settingsDialog.setVideoSettings(m_videoSettings);
     settingsDialog.setFormat(m_videoContainerFormat);

     if (settingsDialog.exec()) {
         m_audioSettings = settingsDialog.audioSettings();
         m_videoSettings = settingsDialog.videoSettings();
         m_videoContainerFormat = settingsDialog.format();

         m_mediaRecorder->setEncodingSettings(
                     m_audioSettings,
                     m_videoSettings,
                     m_videoContainerFormat);

         m_camera->unload();
         m_camera->start();
     }
 }

 void Camera::configureImageSettings()
 {
     ImageSettings settingsDialog(m_imageCapture.data());
     settingsDialog.setWindowFlags(settingsDialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);

     settingsDialog.setImageSettings(m_imageSettings);

     if (settingsDialog.exec()) {
         m_imageSettings = settingsDialog.imageSettings();
         m_imageCapture->setEncodingSettings(m_imageSettings);
     }
 }

 void Camera::record()
 {
     m_mediaRecorder->record();
     updateRecordTime();
 }

 void Camera::pause()
 {
     m_mediaRecorder->pause();
 }

 void Camera::stop()
 {
     m_mediaRecorder->stop();
 }

 void Camera::setMuted(bool muted)
 {
     m_mediaRecorder->setMuted(muted);
 }

 void Camera::toggleLock()
 {
     switch (m_camera->lockStatus()) {
     case QCamera::Searching:
     case QCamera::Locked:
         m_camera->unlock();
         break;
     case QCamera::Unlocked:
         m_camera->searchAndLock();
     }
 }

 void Camera::updateLockStatus(QCamera::LockStatus status, QCamera::LockChangeReason reason)
 {
     QColor indicationColor = Qt::black;

     switch (status) {
     case QCamera::Searching:
         indicationColor = Qt::yellow;
         ui->statusbar->showMessage(tr("Focusing..."));
         ui->lockButton->setText(tr("Focusing..."));
         break;
     case QCamera::Locked:
         indicationColor = Qt::darkGreen;
         ui->lockButton->setText(tr("Unlock"));
         ui->statusbar->showMessage(tr("Focused"), 2000);
         break;
     case QCamera::Unlocked:
         indicationColor = reason == QCamera::LockFailed ? Qt::red : Qt::black;
         ui->lockButton->setText(tr("Focus"));
         if (reason == QCamera::LockFailed)
             ui->statusbar->showMessage(tr("Focus Failed"), 2000);
     }

     QPalette palette = ui->lockButton->palette();
     palette.setColor(QPalette::ButtonText, indicationColor);
     ui->lockButton->setPalette(palette);
 }

 void Camera::takeImage()
 {
     m_isCapturingImage = true;
     m_imageCapture->capture();
 }

 void Camera::displayCaptureError(int id, const QCameraImageCapture::Error error, const QString &errorString)
 {
     Q_UNUSED(id);
     Q_UNUSED(error);
     QMessageBox::warning(this, tr("Image Capture Error"), errorString);
     m_isCapturingImage = false;
 }

 void Camera::startCamera()
 {
     m_camera->start();
 }

 void Camera::stopCamera()
 {
     m_camera->stop();
 }

 void Camera::updateCaptureMode()
 {
     int tabIndex = ui->captureWidget->currentIndex();
     QCamera::CaptureModes captureMode = tabIndex == 0 ? QCamera::CaptureStillImage : QCamera::CaptureVideo;

     if (m_camera->isCaptureModeSupported(captureMode))
         m_camera->setCaptureMode(captureMode);
 }

 void Camera::updateCameraState(QCamera::State state)
 {
     switch (state) {
     case QCamera::ActiveState:
         ui->actionStartCamera->setEnabled(false);
         ui->actionStopCamera->setEnabled(true);
         ui->captureWidget->setEnabled(true);
         ui->actionSettings->setEnabled(true);
         break;
     case QCamera::UnloadedState:
     case QCamera::LoadedState:
         ui->actionStartCamera->setEnabled(true);
         ui->actionStopCamera->setEnabled(false);
         ui->captureWidget->setEnabled(false);
         ui->actionSettings->setEnabled(false);
     }
 }

 void Camera::updateRecorderState(QMediaRecorder::State state)
 {
     switch (state) {
     case QMediaRecorder::StoppedState:
         ui->recordButton->setEnabled(true);
         ui->pauseButton->setEnabled(true);
         ui->stopButton->setEnabled(false);
         break;
     case QMediaRecorder::PausedState:
         ui->recordButton->setEnabled(true);
         ui->pauseButton->setEnabled(false);
         ui->stopButton->setEnabled(true);
         break;
     case QMediaRecorder::RecordingState:
         ui->recordButton->setEnabled(false);
         ui->pauseButton->setEnabled(true);
         ui->stopButton->setEnabled(true);
         break;
     }
 }

 void Camera::setExposureCompensation(int index)
 {
     m_camera->exposure()->setExposureCompensation(index*0.5);
 }

 void Camera::displayRecorderError()
 {
     QMessageBox::warning(this, tr("Capture Error"), m_mediaRecorder->errorString());
 }

 void Camera::displayCameraError()
 {
     QMessageBox::warning(this, tr("Camera Error"), m_camera->errorString());
 }

 void Camera::updateCameraDevice(QAction *action)
 {
     setCamera(qvariant_cast<QCameraInfo>(action->data()));
 }

 void Camera::displayViewfinder()
 {
     ui->stackedWidget->setCurrentIndex(0);
 }

 void Camera::displayCapturedImage()
 {
     ui->stackedWidget->setCurrentIndex(1);
 }

 void Camera::readyForCapture(bool ready)
 {
     ui->takeImageButton->setEnabled(ready);
 }

 void Camera::imageSaved(int id, const QString &fileName)
 {
     Q_UNUSED(id);
     ui->statusbar->showMessage(tr("Captured \"%1\"").arg(QDir::toNativeSeparators(fileName)));

     m_isCapturingImage = false;
     if (m_applicationExiting)
         close();
 }

 void Camera::closeEvent(QCloseEvent *event)
 {
     if (m_isCapturingImage) {
         setEnabled(false);
         m_applicationExiting = true;
         event->ignore();
     } else {
         event->accept();
     }
 }
	/****************************************************************************
	**
	** Copyright (C) 2017 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the examples of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** 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 The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** BSD License Usage
	** Alternatively, you may use this file under the terms of the BSD license
	** as follows:
	**
	** "Redistribution and use in source and binary forms, with or without
	** modification, are permitted provided that the following conditions are
	** met:
	** * Redistributions of source code must retain the above copyright
	** notice, this list of conditions and the following disclaimer.
	** * Redistributions in binary form must reproduce the above copyright
	** notice, this list of conditions and the following disclaimer in
	** the documentation and/or other materials provided with the
	** distribution.
	** * Neither the name of The Qt Company Ltd nor the names of its
	** contributors may be used to endorse or promote products derived
	** from this software without specific prior written permission.
	**
	**
	** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "camera.h"
	#include "ui_camera.h"
	#include "videosettings.h"
	#include "imagesettings.h"

	#include <QMediaService>
	#include <QMediaRecorder>
	#include <QCameraViewfinder>
	#include <QCameraInfo>
	#include <QMediaMetaData>

	#include <QMessageBox>
	#include <QPalette>

	#include <QtWidgets>

	Q_DECLARE_METATYPE(QCameraInfo)

	Camera::Camera() : ui(new Ui::Camera)
	{
	ui->setupUi(this);

	//Camera devices:

	QActionGroup *videoDevicesGroup = new QActionGroup(this);
	videoDevicesGroup->setExclusive(true);
	const QList<QCameraInfo> availableCameras = QCameraInfo::availableCameras();
	for (const QCameraInfo &cameraInfo : availableCameras) {
	QAction *videoDeviceAction = new QAction(cameraInfo.description(), videoDevicesGroup);
	videoDeviceAction->setCheckable(true);
	videoDeviceAction->setData(QVariant::fromValue(cameraInfo));
	if (cameraInfo == QCameraInfo::defaultCamera())
	videoDeviceAction->setChecked(true);

	ui->menuDevices->addAction(videoDeviceAction);
	}

	connect(videoDevicesGroup, &QActionGroup::triggered, this, &Camera::updateCameraDevice);
	connect(ui->captureWidget, &QTabWidget::currentChanged, this, &Camera::updateCaptureMode);

	setCamera(QCameraInfo::defaultCamera());
	}

	void Camera::setCamera(const QCameraInfo &cameraInfo)
	{
	m_camera.reset(new QCamera(cameraInfo));

	connect(m_camera.data(), &QCamera::stateChanged, this, &Camera::updateCameraState);
	connect(m_camera.data(), QOverload<QCamera::Error>::of(&QCamera::error), this, &Camera::displayCameraError);

	m_mediaRecorder.reset(new QMediaRecorder(m_camera.data()));
	connect(m_mediaRecorder.data(), &QMediaRecorder::stateChanged, this, &Camera::updateRecorderState);

	m_imageCapture.reset(new QCameraImageCapture(m_camera.data()));

	connect(m_mediaRecorder.data(), &QMediaRecorder::durationChanged, this, &Camera::updateRecordTime);
	connect(m_mediaRecorder.data(), QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
	this, &Camera::displayRecorderError);

	m_mediaRecorder->setMetaData(QMediaMetaData::Title, QVariant(QLatin1String("Test Title")));

	connect(ui->exposureCompensation, &QAbstractSlider::valueChanged, this, &Camera::setExposureCompensation);

	m_camera->setViewfinder(ui->viewfinder);

	updateCameraState(m_camera->state());
	updateLockStatus(m_camera->lockStatus(), QCamera::UserRequest);
	updateRecorderState(m_mediaRecorder->state());

	connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
	connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
	connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
	connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
	this, &Camera::displayCaptureError);

	connect(m_camera.data(), QOverload<QCamera::LockStatus, QCamera::LockChangeReason>::of(&QCamera::lockStatusChanged),
	this, &Camera::updateLockStatus);

	ui->captureWidget->setTabEnabled(0, (m_camera->isCaptureModeSupported(QCamera::CaptureStillImage)));
	ui->captureWidget->setTabEnabled(1, (m_camera->isCaptureModeSupported(QCamera::CaptureVideo)));

	updateCaptureMode();
	m_camera->start();
	}

	void Camera::keyPressEvent(QKeyEvent * event)
	{
	if (event->isAutoRepeat())
	return;

	switch (event->key()) {
	case Qt::Key_CameraFocus:
	displayViewfinder();
	m_camera->searchAndLock();
	event->accept();
	break;
	case Qt::Key_Camera:
	if (m_camera->captureMode() == QCamera::CaptureStillImage) {
	takeImage();
	} else {
	if (m_mediaRecorder->state() == QMediaRecorder::RecordingState)
	stop();
	else
	record();
	}
	event->accept();
	break;
	default:
	QMainWindow::keyPressEvent(event);
	}
	}

	void Camera::keyReleaseEvent(QKeyEvent *event)
	{
	if (event->isAutoRepeat())
	return;

	switch (event->key()) {
	case Qt::Key_CameraFocus:
	m_camera->unlock();
	break;
	default:
	QMainWindow::keyReleaseEvent(event);
	}
	}

	void Camera::updateRecordTime()
	{
	QString str = QString("Recorded %1 sec").arg(m_mediaRecorder->duration()/1000);
	ui->statusbar->showMessage(str);
	}

	void Camera::processCapturedImage(int requestId, const QImage& img)
	{
	Q_UNUSED(requestId);
	QImage scaledImage = img.scaled(ui->viewfinder->size(),
	Qt::KeepAspectRatio,
	Qt::SmoothTransformation);

	ui->lastImagePreviewLabel->setPixmap(QPixmap::fromImage(scaledImage));

	// Display captured image for 4 seconds.
	displayCapturedImage();
	QTimer::singleShot(4000, this, &Camera::displayViewfinder);
	}

	void Camera::configureCaptureSettings()
	{
	switch (m_camera->captureMode()) {
	case QCamera::CaptureStillImage:
	configureImageSettings();
	break;
	case QCamera::CaptureVideo:
	configureVideoSettings();
	break;
	default:
	break;
	}
	}

	void Camera::configureVideoSettings()
	{
	VideoSettings settingsDialog(m_mediaRecorder.data());
	settingsDialog.setWindowFlags(settingsDialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);

	settingsDialog.setAudioSettings(m_audioSettings);
	settingsDialog.setVideoSettings(m_videoSettings);
	settingsDialog.setFormat(m_videoContainerFormat);

	if (settingsDialog.exec()) {
	m_audioSettings = settingsDialog.audioSettings();
	m_videoSettings = settingsDialog.videoSettings();
	m_videoContainerFormat = settingsDialog.format();

	m_mediaRecorder->setEncodingSettings(
	m_audioSettings,
	m_videoSettings,
	m_videoContainerFormat);

	m_camera->unload();
	m_camera->start();
	}
	}

	void Camera::configureImageSettings()
	{
	ImageSettings settingsDialog(m_imageCapture.data());
	settingsDialog.setWindowFlags(settingsDialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);

	settingsDialog.setImageSettings(m_imageSettings);

	if (settingsDialog.exec()) {
	m_imageSettings = settingsDialog.imageSettings();
	m_imageCapture->setEncodingSettings(m_imageSettings);
	}
	}

	void Camera::record()
	{
	m_mediaRecorder->record();
	updateRecordTime();
	}

	void Camera::pause()
	{
	m_mediaRecorder->pause();
	}

	void Camera::stop()
	{
	m_mediaRecorder->stop();
	}

	void Camera::setMuted(bool muted)
	{
	m_mediaRecorder->setMuted(muted);
	}

	void Camera::toggleLock()
	{
	switch (m_camera->lockStatus()) {
	case QCamera::Searching:
	case QCamera::Locked:
	m_camera->unlock();
	break;
	case QCamera::Unlocked:
	m_camera->searchAndLock();
	}
	}

	void Camera::updateLockStatus(QCamera::LockStatus status, QCamera::LockChangeReason reason)
	{
	QColor indicationColor = Qt::black;

	switch (status) {
	case QCamera::Searching:
	indicationColor = Qt::yellow;
	ui->statusbar->showMessage(tr("Focusing..."));
	ui->lockButton->setText(tr("Focusing..."));
	break;
	case QCamera::Locked:
	indicationColor = Qt::darkGreen;
	ui->lockButton->setText(tr("Unlock"));
	ui->statusbar->showMessage(tr("Focused"), 2000);
	break;
	case QCamera::Unlocked:
	indicationColor = reason == QCamera::LockFailed ? Qt::red : Qt::black;
	ui->lockButton->setText(tr("Focus"));
	if (reason == QCamera::LockFailed)
	ui->statusbar->showMessage(tr("Focus Failed"), 2000);
	}

	QPalette palette = ui->lockButton->palette();
	palette.setColor(QPalette::ButtonText, indicationColor);
	ui->lockButton->setPalette(palette);
	}

	void Camera::takeImage()
	{
	m_isCapturingImage = true;
	m_imageCapture->capture();
	}

	void Camera::displayCaptureError(int id, const QCameraImageCapture::Error error, const QString &errorString)
	{
	Q_UNUSED(id);
	Q_UNUSED(error);
	QMessageBox::warning(this, tr("Image Capture Error"), errorString);
	m_isCapturingImage = false;
	}

	void Camera::startCamera()
	{
	m_camera->start();
	}

	void Camera::stopCamera()
	{
	m_camera->stop();
	}

	void Camera::updateCaptureMode()
	{
	int tabIndex = ui->captureWidget->currentIndex();
	QCamera::CaptureModes captureMode = tabIndex == 0 ? QCamera::CaptureStillImage : QCamera::CaptureVideo;

	if (m_camera->isCaptureModeSupported(captureMode))
	m_camera->setCaptureMode(captureMode);
	}

	void Camera::updateCameraState(QCamera::State state)
	{
	switch (state) {
	case QCamera::ActiveState:
	ui->actionStartCamera->setEnabled(false);
	ui->actionStopCamera->setEnabled(true);
	ui->captureWidget->setEnabled(true);
	ui->actionSettings->setEnabled(true);
	break;
	case QCamera::UnloadedState:
	case QCamera::LoadedState:
	ui->actionStartCamera->setEnabled(true);
	ui->actionStopCamera->setEnabled(false);
	ui->captureWidget->setEnabled(false);
	ui->actionSettings->setEnabled(false);
	}
	}

	void Camera::updateRecorderState(QMediaRecorder::State state)
	{
	switch (state) {
	case QMediaRecorder::StoppedState:
	ui->recordButton->setEnabled(true);
	ui->pauseButton->setEnabled(true);
	ui->stopButton->setEnabled(false);
	break;
	case QMediaRecorder::PausedState:
	ui->recordButton->setEnabled(true);
	ui->pauseButton->setEnabled(false);
	ui->stopButton->setEnabled(true);
	break;
	case QMediaRecorder::RecordingState:
	ui->recordButton->setEnabled(false);
	ui->pauseButton->setEnabled(true);
	ui->stopButton->setEnabled(true);
	break;
	}
	}

	void Camera::setExposureCompensation(int index)
	{
	m_camera->exposure()->setExposureCompensation(index*0.5);
	}

	void Camera::displayRecorderError()
	{
	QMessageBox::warning(this, tr("Capture Error"), m_mediaRecorder->errorString());
	}

	void Camera::displayCameraError()
	{
	QMessageBox::warning(this, tr("Camera Error"), m_camera->errorString());
	}

	void Camera::updateCameraDevice(QAction *action)
	{
	setCamera(qvariant_cast<QCameraInfo>(action->data()));
	}

	void Camera::displayViewfinder()
	{
	ui->stackedWidget->setCurrentIndex(0);
	}

	void Camera::displayCapturedImage()
	{
	ui->stackedWidget->setCurrentIndex(1);
	}

	void Camera::readyForCapture(bool ready)
	{
	ui->takeImageButton->setEnabled(ready);
	}

	void Camera::imageSaved(int id, const QString &fileName)
	{
	Q_UNUSED(id);
	ui->statusbar->showMessage(tr("Captured \"%1\"").arg(QDir::toNativeSeparators(fileName)));

	m_isCapturingImage = false;
	if (m_applicationExiting)
	close();
	}

	void Camera::closeEvent(QCloseEvent *event)
	{
	if (m_isCapturingImage) {
	setEnabled(false);
	m_applicationExiting = true;
	event->ignore();
	} else {
	event->accept();
	}
	}