implement inhibiting sleep on linux during video playback

Fixes #1791

CMakeLists.txt

@@ -81,8 +81,7 @@ list(APPEND OLIVE_LIBRARIES ${OPENEXR_LIBRARIES})
 list(APPEND OLIVE_INCLUDE_DIRS ${OPENEXR_INCLUDES})
 
 # Link Qt 5
-find_package(Qt5 5.6 REQUIRED
-  COMPONENTS
+set(QT_LIBRARIES
   Core
   Gui
   Widgets
@@ -90,8 +89,15 @@ find_package(Qt5 5.6 REQUIRED
   Svg
   LinguistTools
   Concurrent
+)
+if (UNIX AND NOT APPLE)
+  list(APPEND QT_LIBRARIES DBus)
+endif()
+find_package(Qt5 5.6 REQUIRED
+  COMPONENTS
+    ${QT_LIBRARIES}
   OPTIONAL_COMPONENTS
-  Network
+    Network
 )
 if (NOT Qt5Network_FOUND)
   message("   Qt5::Network module not found, crash reporting will be disabled.")
@@ -158,6 +164,8 @@ endif()
 
 if (APPLE)
   list(APPEND OLIVE_LIBRARIES "-framework IOKit")
+elseif(UNIX)
+  list(APPEND OLIVE_LIBRARIES Qt5::DBus)
 endif()
 
 # Generate Git hash

app/widget/viewer/viewerpreventsleep.cpp

@@ -6,12 +6,16 @@
 #include <winbase.h>
 #elif defined(Q_OS_MAC)
 #include <IOKit/pwr_mgt/IOPMLib.h>
+#elif defined(Q_OS_LINUX)
+#include <QtDBus/QtDBus>
 #endif
 
 namespace olive {
 
 #if defined(Q_OS_MAC)
 IOPMAssertionID assertionID = 0;
+#elif defined(Q_OS_LINUX)
+
 #endif
 
 void PreventSleep(bool on)
@@ -28,6 +32,42 @@ void PreventSleep(bool on)
     IOPMAssertionRelease(assertionID);
     assertionID = 0;
   }
+#elif defined(Q_OS_LINUX)
+  QDBusConnection bus = QDBusConnection::sessionBus();
+  if(bus.isConnected()) {
+    static const QStringList sleep_services = {
+      QStringLiteral("org.freedesktop.ScreenSaver"),
+      //QStringLiteral("org.gnome.SessionManager")
+    };
+    static const QStringList sleep_paths = {
+      QStringLiteral("/org/freedesktop/ScreenSaver"),
+      //QStringLiteral("/org/gnome/SessionManager")
+    };
+    static QVector<uint> sleep_cookies;
+
+    // Initialize vector to 0
+    if (sleep_cookies.isEmpty()) {
+      sleep_cookies.resize(sleep_services.size());
+      sleep_cookies.fill(0);
+    }
+
+    for (int i=0; i<sleep_cookies.size(); i++) {
+      QDBusInterface interface(sleep_services.at(i), sleep_paths.at(i), sleep_services.at(i), bus);
+      if (interface.isValid()) {
+        QDBusReply<uint> reply;
+
+        if (on) {
+          reply = interface.call(QStringLiteral("Inhibit"), QStringLiteral("Olive Video Editor"), QStringLiteral("Video Playback"));
+        } else {
+          reply = interface.call(QStringLiteral("UnInhibit"), sleep_cookies.at(i));
+        }
+
+        if (reply.isValid()) {
+          sleep_cookies[i] = reply.value();
+        }
+      }
+    }
+  }
 #endif
 }