Gstreamer glib event loop for macos and windows

- This ensures that gstreamer bus operations work
on macOS and windows, such as enumerating devices.

CMakeLists.txt

@@ -504,7 +504,7 @@ endif()
 if (VOIP)
 	include(FindPkgConfig)
 	pkg_check_modules(GSTREAMER REQUIRED IMPORTED_TARGET gstreamer-sdp-1.0>=1.18 gstreamer-webrtc-1.0>=1.18)
-	if (SCREENSHARE_X11)
+	if (SCREENSHARE_X11 AND NOT WIN32 AND NOT APPLE)
 		pkg_check_modules(XCB REQUIRED IMPORTED_TARGET xcb xcb-ewmh)
 	endif()
 endif()

src/main.cpp

@@ -34,6 +34,11 @@
 #include "emoji/MacHelper.h"
 #endif
 
+#if defined(GSTREAMER_AVAILABLE) && (defined(Q_OS_MAC) || defined(Q_OS_WINDOWS))
+#include <QAbstractEventDispatcher>
+#include <gst/gst.h>
+#endif
+
 #ifdef QML_DEBUGGING
 #include <QQmlDebuggingEnabler>
 QQmlDebuggingEnabler enabler;
@@ -100,6 +105,23 @@ registerSignalHandlers()
 
 #endif
 
+#if defined(GSTREAMER_AVAILABLE) && (defined(Q_OS_MAC) || defined(Q_OS_WINDOWS))
+GMainLoop *gloop = 0;
+GThread *gthread = 0;
+
+extern "C"
+{
+    static gpointer glibMainLoopThreadFunc(gpointer)
+    {
+        gloop = g_main_loop_new(0, false);
+        g_main_loop_run(gloop);
+        g_main_loop_unref(gloop);
+        gloop = 0;
+        return 0;
+    }
+} // extern "C"
+#endif
+
 QPoint
 screenCenter(int width, int height)
 {
@@ -220,6 +242,16 @@ main(int argc, char *argv[])
 
     registerSignalHandlers();
 
+#if defined(GSTREAMER_AVAILABLE) && (defined(Q_OS_MAC) || defined(Q_OS_WINDOWS))
+    // If the version of Qt we're running in does not use GLib, we need to
+    // start a GMainLoop so that gstreamer can dispatch events.
+    const QMetaObject *mo = QAbstractEventDispatcher::instance(qApp->thread())->metaObject();
+    if (gloop == 0 && strcmp(mo->className(), "QEventDispatcherGlib") != 0 &&
+        strcmp(mo->superClass()->className(), "QEventDispatcherGlib") != 0) {
+        gthread = g_thread_new(0, glibMainLoopThreadFunc, 0);
+    }
+#endif
+
     if (parser.isSet(debugOption))
         nhlog::enable_debug_log_from_commandline = true;
 

src/voip/CallDevices.cpp

@@ -8,7 +8,6 @@
 #include <string_view>
 
 #include "CallDevices.h"
-#include "ChatPage.h"
 #include "Logging.h"
 #include "UserSettingsPage.h"
 
@@ -70,7 +69,7 @@ addFrameRate(std::vector<std::string> &rates, const FrameRate &rate)
 void
 setDefaultDevice(bool isVideo)
 {
-    auto settings = ChatPage::instance()->userSettings();
+    auto settings = UserSettings::instance();
     if (isVideo && settings->camera().isEmpty()) {
         const VideoSource &camera = videoSources_.front();
         settings->setCamera(QString::fromStdString(camera.name));
@@ -320,7 +319,7 @@ CallDevices::frameRates(const std::string &cameraName, const std::string &resolu
 GstDevice *
 CallDevices::audioDevice() const
 {
-    std::string name = ChatPage::instance()->userSettings()->microphone().toStdString();
+    std::string name = UserSettings::instance()->microphone().toStdString();
     if (auto it = std::find_if(audioSources_.cbegin(),
                                audioSources_.cend(),
                                [&name](const auto &s) { return s.name == name; });
@@ -336,7 +335,7 @@ CallDevices::audioDevice() const
 GstDevice *
 CallDevices::videoDevice(std::pair<int, int> &resolution, std::pair<int, int> &frameRate) const
 {
-    auto settings    = ChatPage::instance()->userSettings();
+    auto settings    = UserSettings::instance();
     std::string name = settings->camera().toStdString();
     if (auto s = getVideoSource(name); s) {
         nhlog::ui()->debug("WebRTC: camera: {}", name);

src/voip/CallManager.cpp

@@ -292,7 +292,7 @@ CallManager::handleEvent(const RoomEvent<CallInvite> &callInviteEvent)
         return;
     }
 
-    const QString &ringtone = ChatPage::instance()->userSettings()->ringtone();
+    const QString &ringtone = UserSettings::instance()->ringtone();
     if (ringtone != QLatin1String("Mute"))
         playRingtone(ringtone == QLatin1String("Default")
                        ? QUrl(QStringLiteral("qrc:/media/media/ring.ogg"))
@@ -431,8 +431,8 @@ QStringList
 CallManager::devices(bool isVideo) const
 {
     QStringList ret;
-    const QString &defaultDevice = isVideo ? ChatPage::instance()->userSettings()->camera()
+    const QString &defaultDevice =
-                                           : ChatPage::instance()->userSettings()->microphone();
+      isVideo ? UserSettings::instance()->camera() : UserSettings::instance()->microphone();
     std::vector<std::string> devices =
       CallDevices::instance().names(isVideo, defaultDevice.toStdString());
     ret.reserve(devices.size());