--- a/libervia/web/pages/calls/_browser/webrtc.py	Thu Aug 17 16:23:01 2023 +0200
+++ b/libervia/web/pages/calls/_browser/webrtc.py	Fri Aug 18 17:43:01 2023 +0200
@@ -15,17 +15,43 @@
 
 
 class WebRTC:
-    def __init__(self):
+    def __init__(
+        self,
+        screen_sharing_cb=None,
+        on_connection_established_cb=None,
+        on_reconnect_cb=None,
+        on_connection_lost_cb=None,
+        on_video_devices=None,
+    ):
         self.reset_instance()
+
+        # ICE events
         bridge.register_signal("ice_candidates_new", self._on_ice_candidates_new)
         bridge.register_signal("ice_restart", self._on_ice_restart)
-        self.on_connection_established_cb = None
-        self.on_reconnect_cb = None
-        self.on_connection_lost_cb = None
+
+        # connection events callbacks
+        self.on_connection_established_cb = on_connection_established_cb
+        self.on_reconnect_cb = on_reconnect_cb
+        self.on_connection_lost_cb = on_connection_lost_cb
+
+        # video devices
+        self.on_video_devices = on_video_devices
+        self.video_devices = []
+        self.has_multiple_cameras = False
+        self.current_camera = None
+
+        # Initially populate the video devices list
+        aio.run(self._populate_video_devices())
+
+        # muting
         self.is_audio_muted = None
         self.is_video_muted = None
+
+        # screen sharing
         self._is_sharing_screen = False
-        self.screen_sharing_cb = None
+        self.screen_sharing_cb = screen_sharing_cb
+
+        # video elements
         self.local_video_elt = document["local_video"]
         self.remote_video_elt = document["remote_video"]
 
@@ -56,6 +82,30 @@
         self.media_candidates = {}
         self.candidates_gathered = aio.Future()
 
+    async def _populate_video_devices(self):
+        devices = await window.navigator.mediaDevices.enumerateDevices()
+        devices_ids = set()
+        self.video_devices.clear()
+        for device in devices:
+            if device.kind != "videoinput":
+                continue
+            # we can have multiple devices with same IDs in some corner cases (e.g.
+            # infrared camera)
+            device_id = device.deviceId
+            if device_id in devices_ids:
+                continue
+            devices_ids.add(device_id)
+            self.video_devices.append(device)
+        self.has_multiple_cameras = len(self.video_devices) > 1
+        if self.on_video_devices is not None:
+            self.on_video_devices(self.has_multiple_cameras)
+        # Set the initial camera to the default (usually front on mobile)
+        if self.video_devices:
+            self.current_camera = self.video_devices[0].deviceId
+        log.debug(
+            f"devices populated: {self.video_devices=} {self.has_multiple_cameras=}"
+        )
+
     @property
     def media_types(self):
         if self._media_types is None:
@@ -318,7 +368,13 @@
                 for track in self.local_video_elt.srcObject.getTracks():
                     if track.kind == "video":
                         track.stop()
-            media_constraints = {"video": True}
+
+            media_constraints = {
+                "video": {"deviceId": self.current_camera}
+                if self.current_camera
+                else True
+            }
+
             new_stream = await window.navigator.mediaDevices.getUserMedia(
                 media_constraints
             )
@@ -369,6 +425,72 @@
 
         return local_stream
 
+    async def switch_camera(self) -> None:
+        """Switches to the next available camera.
+
+        This method cycles through the list of available video devices, replaces the
+        current video track with the next one in the user's local video element, and then
+        updates the sender's track in the peer connection. If there's only one camera or
+        if an error occurs while switching, the method logs the error and does nothing.
+        """
+        log.info("switching camera")
+        if not self.has_multiple_cameras:
+            log.error("No multiple cameras to switch.")
+            return
+
+        current_camera_index = -1
+        for i, device_info in enumerate(self.video_devices):
+            if device_info.deviceId == self.current_camera:
+                current_camera_index = i
+                break
+
+        if current_camera_index == -1:
+            log.error("Current camera not found in available devices.")
+            return
+
+        # Switch to the next camera in the list
+        next_camera_index = (current_camera_index + 1) % len(self.video_devices)
+        self.current_camera = self.video_devices[next_camera_index].deviceId
+        log.debug(f"{next_camera_index=} {self.current_camera=}")
+
+        new_stream = await window.navigator.mediaDevices.getUserMedia(
+            {"video": {"deviceId": self.current_camera}}
+        )
+
+        new_video_tracks = [
+            track for track in new_stream.getTracks() if track.kind == "video"
+        ]
+
+        if not new_video_tracks:
+            log.error("Failed to retrieve the video track from the new stream.")
+            return
+
+        # Update local video element's stream
+        local_stream = self.local_video_elt.srcObject
+        if local_stream:
+            local_video_tracks = [
+                track for track in local_stream.getTracks() if track.kind == "video"
+            ]
+            if local_video_tracks:
+                local_video_tracks[0].stop()
+                local_stream.removeTrack(local_video_tracks[0])
+                local_stream.addTrack(new_video_tracks[0])
+            self.local_video_elt.srcObject = local_stream
+
+        # update remove video stream
+        video_sender = next(
+            (
+                sender
+                for sender in self._peer_connection.getSenders()
+                if sender.track and sender.track.kind == "video"
+            ),
+            None,
+        )
+
+        if video_sender:
+            await video_sender.replaceTrack(new_video_tracks[0])
+
+
     async def _gather_ice_candidates(self, is_initiator: bool, remote_candidates=None):
         """Get ICE candidates and wait to have them all before returning them