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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
/* Camera snippets */
#include "qcamera.h"
#include "qcameradevice.h"
#include "qmediarecorder.h"
#include "qmediadevices.h"
#include "qmediacapturesession.h"
#include "qimagecapture.h"
#include "qvideosink.h"
#include <QtMultimediaWidgets/qvideowidget.h>
#include <QtGui/qscreen.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qimage.h>
/* Globals so that everything is consistent. */
QCamera *camera = 0;
QMediaRecorder *recorder = 0;
QImageCapture *imageCapture = 0;
QVideoWidget *viewfinder = 0;
//! [Camera overview check]
bool checkCameraAvailability()
{
if (QMediaDevices::videoInputs().count() > 0)
return true;
else
return false;
}
//! [Camera overview check]
void overview_viewfinder()
{
//! [Camera overview viewfinder]
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
viewfinder = new QVideoWidget;
captureSession.setVideoOutput(viewfinder);
viewfinder->show();
camera->start(); // to start the camera
//! [Camera overview viewfinder]
}
void overview_camera_by_position()
{
//! [Camera overview position]
camera = new QCamera(QCameraDevice::FrontFace);
//! [Camera overview position]
}
// -.-
void overview_surface()
{
QVideoSink *mySink;
//! [Camera overview surface]
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
mySink = new QVideoSink;
captureSession.setVideoOutput(mySink);
camera->start();
// MyVideoSink::setVideoFrame(..) will be called with video frames
//! [Camera overview surface]
}
void overview_viewfinder_orientation()
{
QCamera camera;
//! [Camera overview viewfinder orientation]
// Assuming a QImage has been created from the QVideoFrame that needs to be presented
QImage videoFrame;
QCameraDevice cameraDevice(camera); // needed to get the camera sensor position and orientation
// Get the current display orientation
const QScreen *screen = QGuiApplication::primaryScreen();
const int screenAngle = screen->angleBetween(screen->nativeOrientation(), screen->orientation());
int rotation;
if (cameraDevice.position() == QCameraDevice::BackFace) {
rotation = (cameraDevice.orientation() - screenAngle) % 360;
} else {
// Front position, compensate the mirror
rotation = (360 - cameraDevice.orientation() + screenAngle) % 360;
}
// Rotate the frame so it always shows in the correct orientation
videoFrame = videoFrame.transformed(QTransform().rotate(rotation));
//! [Camera overview viewfinder orientation]
}
void overview_still()
{
//! [Camera overview capture]
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
imageCapture = new QImageCapture;
captureSession.setImageCapture(imageCapture);
camera->start(); // Viewfinder frames start flowing
//on shutter button pressed
imageCapture->capture();
//! [Camera overview capture]
}
void overview_movie()
{
//! [Camera overview movie]
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
recorder = new QMediaRecorder(camera);
captureSession.setRecorder(recorder);
camera->start();
// setup output format for the recorder
QMediaFormat format(QMediaFormat::MPEG4);
format.setVideoCodec(QMediaRecorder::VideoCodec::H264);
format.setAudioCodec(QMediaRecorder::AudioCodec::MP3);
recorder->setMediaFormat(settings);
//on shutter button pressed
recorder->record();
// sometime later, or on another press
recorder->stop();
//! [Camera overview movie]
}
void camera_listing()
{
//! [Camera listing]
const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();
for (const QCameraDevice &cameraDevice : cameras)
qDebug() << cameraDevice.description();
//! [Camera listing]
}
void camera_selection()
{
//! [Camera selection]
const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();
for (const QCameraDevice &cameraDevice : cameras) {
if (cameraDevice.description() == "mycamera")
camera = new QCamera(cameraDevice);
}
//! [Camera selection]
}
void camera_info()
{
//! [Camera info]
QCamera myCamera;
QCameraDevice cameraDevice = camera->cameraDevice();
if (cameraDevice.position() == QCameraDevice::FrontFace)
qDebug() << "The camera is on the front face of the hardware system.";
else if (cameraDevice.position() == QCameraDevice::BackFace)
qDebug() << "The camera is on the back face of the hardware system.";
//! [Camera info]
}
void camera_blah()
{
//! [Camera]
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
viewfinder = new QVideoWidget();
viewfinder->show();
captureSession.setVideoOutput(viewfinder);
imageCapture = new QImageCapture(camera);
captureSession.setImageCapture(imageCapture);
camera->start();
//! [Camera]
//! [Camera keys]
//on shutter button pressed
imageCapture->capture();
//! [Camera keys]
}
void cameraimageprocessing()
{
camera = new QCamera;
//! [Camera image whitebalance]
camera->setWhiteBalanceMode(QCamera::WhiteBalanceFluorescent);
//! [Camera image whitebalance]
}
void camerafocus()
{
//! [Camera custom focus]
camera->setFocusPointMode(QCamera::FocusModeManual);
camera->setCustomFocusPoint(QPointF(0.25f, 0.75f)); // A point near the bottom left, 25% away from the corner, near that shiny vase
//! [Camera custom focus]
//! [Camera zoom]
camera->setZoomFactor(3.0);
//! [Camera zoom]
}
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