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/* Copyright (c) 2015, Stanislaw Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby granted,
* provided that the above copyright notice and this permission
* notice appear in all copies.
*/
#pragma once
#if !defined(QT_MOC_RUN)
#include <QTimer>
#include <QMutex>
#include <QMutexLocker>
#include <opencv2/videoio.hpp>
#include "opentrack-compat/camera-names.hpp"
#ifdef __linux
# include <QProcess>
# include "opentrack-compat/sleep.hpp"
#endif
#ifdef _WIN32
# include <objbase.h>
# include <winerror.h>
# include <windows.h>
#endif
#ifdef _WIN32
static void init_com_threading(void)
{
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
if (FAILED(hr))
qDebug() << "failed CoInitializeEx" << hr << "code" << GetLastError();
}
#endif
static void maybe_grab_frame(cv::VideoCapture& cap)
{
for (int i = 0; i < 60; i++)
{
if (cap.grab())
break;
portable::sleep(50);
}
}
class camera_dialog
{
public:
inline virtual ~camera_dialog() {}
#ifdef __linux
void open_camera_settings(cv::VideoCapture *, const QString &camera_name, QMutex *)
{
int idx = camera_name_to_index(camera_name);
QProcess::startDetached("qv4l2", QStringList() << "-d" << ("/dev/video" + QString::number(idx)));
}
#elif defined(_WIN32)
void open_camera_settings(cv::VideoCapture* cap, const QString& camera_name, QMutex* camera_mtx)
{
if (cap)
{
QMutexLocker l(camera_mtx);
if (cap->isOpened())
{
init_com_threading();
maybe_grab_frame(*cap);
cap->set(cv::CAP_PROP_SETTINGS, 1);
return;
}
}
if (t.isActive())
return;
// don't hog the camera capture
if (!t.isSingleShot())
QObject::connect(&t, &QTimer::timeout, [&]() -> void { delete_capture(); });
init_com_threading();
fake_capture = cv::VideoCapture(camera_name_to_index(camera_name));
maybe_grab_frame(fake_capture);
fake_capture.set(cv::CAP_PROP_SETTINGS, 1);
t.setSingleShot(true);
t.setInterval(5000);
// HACK: we're not notified when it's safe to close the capture
t.start();
}
#else
void open_camera_settings(cv::VideoCapture*, const QString&, QMutex*) {}
#endif
private:
#if defined(_WIN32)
cv::VideoCapture fake_capture;
QTimer t;
void delete_capture()
{
fake_capture.open("");
}
#endif
};
#endif
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