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Camera.cpp
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Camera.cpp
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// +-----------------------------------------+
// | License: MIT |
// +-----------------------------------------+
// | Copyright (c) 2024 |
// | Author: Gleb Trufanov (aka Glebchansky) |
// +-----------------------------------------+
#include "Camera.h"
Camera::Camera(int preferredResolutionWidth, int preferredResolutionHeight)
: _preferredResolution(preferredResolutionWidth, preferredResolutionHeight)
{
SetCameraDevice(0);
}
// Get the actual camera resolution
cv::Size Camera::GetResolution(const cv::Size& thresholdResolution) const {
auto actualResolution = cv::Size(static_cast<int>(_videoCapture.get(cv::CAP_PROP_FRAME_WIDTH)),
static_cast<int>(_videoCapture.get(cv::CAP_PROP_FRAME_HEIGHT)));
if (std::tie(actualResolution.width, actualResolution.height) > std::tie(thresholdResolution.width, thresholdResolution.height))
return thresholdResolution;
return actualResolution;
}
bool Camera::IsAvailable() const {
return _isAvailable;
}
void Camera::SetCameraDevice(int cameraDeviceIndex) {
#ifdef _WIN64 // The Camera class is Qt independent, so no Q_OS_* type macros are used here
_isAvailable = _videoCapture.open(cameraDeviceIndex, cv::CAP_DSHOW);
if (!_isAvailable)
_isAvailable = _videoCapture.open(cameraDeviceIndex, cv::CAP_MSMF);
#else
_isAvailable = _videoCapture.open(cameraDeviceIndex, cv::CAP_V4L2);
#endif
if (_isAvailable) {
// If possible, this resolution will be used
_videoCapture.set(cv::CAP_PROP_FRAME_WIDTH, _preferredResolution.width);
_videoCapture.set(cv::CAP_PROP_FRAME_HEIGHT, _preferredResolution.height);
auto const cameraBackendName = _videoCapture.getBackendName();
// Very fine-tuning, perhaps not all systems will be suitable for this combination (DSHOW/V4L2 with MJPEG) to get
// high FPS when capturing frames from the camera
if (cameraBackendName == "DSHOW" || cameraBackendName == "V4L2")
_videoCapture.set(cv::CAP_PROP_FOURCC, cv::VideoWriter::fourcc('M', 'J', 'P', 'G'));
}
}