WIP

ui/src/connecteddevice.py

@@ -4,10 +4,13 @@ from .license import BREEZY_GNOME_FEATURES
 from .settingsmanager import SettingsManager
 from .shortcutdialog import bind_shortcut_settings
 from .statemanager import StateManager
+from .virtualdisplay import VirtualMonitor
 from .xrdriveripc import XRDriverIPC
 import gettext
+import logging
 
 _ = gettext.gettext
+logger = logging.getLogger('breezy_ui')
 
 @Gtk.Template(resource_path='/com/xronlinux/BreezyDesktop/gtk/connected-device.ui')
 class ConnectedDevice(Gtk.Box):
@@ -28,6 +31,7 @@ class ConnectedDevice(Gtk.Box):
     widescreen_mode_switch = Gtk.Template.Child()
     widescreen_mode_row = Gtk.Template.Child()
     curved_display_switch = Gtk.Template.Child()
+    add_virtual_display_button = Gtk.Template.Child()
     set_toggle_display_distance_start_button = Gtk.Template.Child()
     set_toggle_display_distance_end_button = Gtk.Template.Child()
     reassign_recenter_display_shortcut_button = Gtk.Template.Child()
@@ -55,6 +59,7 @@ class ConnectedDevice(Gtk.Box):
             self.follow_mode_switch,
             self.follow_threshold_scale,
             self.curved_display_switch,
+            # self.add_virtual_display_button,
             self.set_toggle_display_distance_start_button,
             self.set_toggle_display_distance_end_button,
             self.movement_look_ahead_scale
@@ -87,6 +92,7 @@ class ConnectedDevice(Gtk.Box):
             self.set_toggle_display_distance_start_button, 
             self.set_toggle_display_distance_end_button
         ])
+        self.add_virtual_display_button.connect('clicked', self.on_add_virtual_display)
 
         self.state_manager = StateManager.get_instance()
         self.state_manager.bind_property('follow-mode', self.follow_mode_switch, 'active', GObject.BindingFlags.DEFAULT)
@@ -166,6 +172,12 @@ class ConnectedDevice(Gtk.Box):
         for widget in widgets:
             widget.connect('clicked', lambda *args, widget=widget: on_set_display_distance_toggle(widget))
             reload_display_distance_toggle_button(widget)
+
+    def on_add_virtual_display(self, widget):
+        VirtualMonitor(1920, 1080, self.on_virtual_display_ready).create()
+
+    def on_virtual_display_ready(self):
+        logger.info("Virtual display ready")
     
     def _on_widget_destroy(self, widget):
         self.state_manager.unbind_property('follow-mode', self.follow_mode_switch, 'active')

ui/src/gtk/connected-device.ui

@@ -84,6 +84,19 @@
                         </child>
                       </object>
                     </child>
+                    <child>
+                      <object class="AdwActionRow">
+                        <property name="title" translatable="yes"><!-- adjustment slider -->Virtual monitors</property>
+                        <property name="valign">2</property>
+                        <child>
+                          <object class="GtkButton" id="add_virtual_display_button">
+                            <property name="name">add-virtual-display</property>
+                            <property name="valign">3</property>
+                            <property name="label" translatable="yes">Add</property>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
                   </object>
                 </child>
                 <child>

ui/src/meson.build

@@ -46,6 +46,7 @@ breezydesktop_sources = [
   'shortcutdialog.py',
   'statemanager.py',
   'time.py',
+  'virtualdisplay.py',
   'verify.py',
   'window.py'
 ]

ui/src/virtualdisplay.py

@@ -0,0 +1,71 @@
+#!/usr/bin/python3
+
+import logging
+import sys
+import signal
+import pydbus
+import gi
+gi.require_version('Gst', '1.0')
+from gi.repository import GLib, GObject, Gst
+
+logger = logging.getLogger('breezy_ui')
+
+screen_cast_iface = 'org.gnome.Mutter.ScreenCast'
+screen_cast_session_iface = 'org.gnome.Mutter.ScreenCast.Session'
+screen_cast_stream_iface = 'org.gnome.Mutter.ScreenCast.Session'
+gst_pipeline_format = "pipewiresrc path=%u ! video/x-raw,max-framerate=120/1,width=%d,height=%d ! videoconvert ! fakesink sync=false"
+
+
+def _screen_cast_session():
+    bus = pydbus.SessionBus()
+    screen_cast = bus.get(screen_cast_iface, '/org/gnome/Mutter/ScreenCast')
+    session_path = screen_cast.CreateSession([])
+    logger.info("session path: %s" % session_path)
+    screen_cast_session = bus.get(screen_cast_iface, session_path)
+
+    return screen_cast_session
+
+class VirtualMonitor:
+    def __init__(self, width, height, on_ready_cb):
+        self.width = width
+        self.height = height
+        self.on_ready_cb = on_ready_cb
+
+        Gst.init(None)
+
+    def create(self):
+        session = _screen_cast_session()
+        stream_path = session.RecordVirtual({
+            'is-platform': GLib.Variant.new_boolean(True),
+        })
+        logger.info("stream path: %s" % stream_path)
+        bus = pydbus.SessionBus()
+        self.stream = bus.get(screen_cast_iface, stream_path)
+
+        self.stream.onPipeWireStreamAdded = self._on_pipewire_stream_added
+
+        session.Start()
+
+    def terminate(self):
+        if self.stream is not None:
+            self.stream.Stop()
+
+        if self.pipeline is not None:
+            self.pipeline.send_event(Gst.Event.new_eos())
+            self.pipeline.set_state(Gst.State.NULL)
+
+    def _on_message(self, bus, message):
+        type = message.type
+        logger.info("message type: %s" % type)
+        if type == Gst.MessageType.EOS or type == Gst.MessageType.ERROR:
+            self.terminate()
+
+    def _on_pipewire_stream_added(self, node_id):
+        logger.info("pipe wire stream added: %u" % node_id)
+
+        self.pipeline = Gst.parse_launch(gst_pipeline_format % (node_id, self.width, self.height))
+        self.pipeline.set_state(Gst.State.PLAYING)
+        self.pipeline.get_bus().connect('message', self._on_message)
+        self.pipeline.set_state(Gst.State.PAUSED)
+        
+        self.on_ready_cb()