1 files changed, 78 insertions, 0 deletions
diff --git a/cv/camera-dialog.cpp b/cv/camera-dialog.cpp
new file mode 100644
index 00000000..05161cb1
--- /dev/null
+++ b/cv/camera-dialog.cpp
@@ -0,0 +1,78 @@
+/* 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.
+ */
+
+#include "cv/camera-dialog.hpp"
+#include <QDebug>
+#include <QMutexLocker>
+
+void camera_dialog::maybe_grab_frame(cv::VideoCapture& cap)
+{
+    for (int i = 0; i < 60; i++)
+    {
+        if (cap.grab())
+            break;
+        portable::sleep(50);
+    }
+}
+
+void camera_dialog::init_com_threading()
+{
+    HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
+    if (FAILED(hr))
+        qDebug() << "failed CoInitializeEx" << hr << "code" << GetLastError();
+}
+
+camera_dialog::~camera_dialog() {}
+
+void camera_dialog::open_camera_settings(cv::VideoCapture* cap, const QString& camera_name, QMutex* camera_mtx)
+{
+#ifdef _WIN32
+    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())
+        t.stop();
+
+    // 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();
+#elif defined(__linux)
+    int idx = camera_name_to_index(camera_name);
+    QProcess::startDetached("qv4l2", QStringList() << "-d" << ("/dev/video" + QString::number(idx)));
+#else
+    // nothing
+#endif
+}
+
+#ifdef _WIN32
+void camera_dialog::delete_capture()
+{
+    fake_capture.open("");
+}
+#endif