Update ONVIF component to SUPPORT_STREAM (#22569)

* Update Onvif component to SUPPORT_STREAM

* Update camera.py

* Update camera.py

* Update camera.py

Remove extra spaces.

* lookup URL when camera is added to hass and add extra guards

homeassistant/components/onvif/camera.py

@@ -13,7 +13,8 @@ import voluptuous as vol
 from homeassistant.const import (
     CONF_NAME, CONF_HOST, CONF_USERNAME, CONF_PASSWORD, CONF_PORT,
     ATTR_ENTITY_ID)
-from homeassistant.components.camera import Camera, PLATFORM_SCHEMA
+from homeassistant.components.camera import (
+    Camera, PLATFORM_SCHEMA, SUPPORT_STREAM)
 from homeassistant.components.camera.const import DOMAIN
 from homeassistant.components.ffmpeg import (
     DATA_FFMPEG, CONF_EXTRA_ARGUMENTS)
@@ -187,13 +188,14 @@ class ONVIFHassCamera(Camera):
             self.hass.data[ONVIF_DATA] = {}
             self.hass.data[ONVIF_DATA][ENTITIES] = []
         self.hass.data[ONVIF_DATA][ENTITIES].append(self)
+        await self.hass.async_add_executor_job(self.obtain_input_uri)
 
     async def async_camera_image(self):
         """Return a still image response from the camera."""
         from haffmpeg.tools import ImageFrame, IMAGE_JPEG
 
         if not self._input:
-            await self.hass.async_add_job(self.obtain_input_uri)
+            await self.hass.async_add_executor_job(self.obtain_input_uri)
             if not self._input:
                 return None
 
@@ -210,7 +212,7 @@ class ONVIFHassCamera(Camera):
         from haffmpeg.camera import CameraMjpeg
 
         if not self._input:
-            await self.hass.async_add_job(self.obtain_input_uri)
+            await self.hass.async_add_executor_job(self.obtain_input_uri)
             if not self._input:
                 return None
 
@@ -228,6 +230,18 @@ class ONVIFHassCamera(Camera):
         finally:
             await stream.close()
 
+    @property
+    def supported_features(self):
+        """Return supported features."""
+        if self._input:
+            return SUPPORT_STREAM
+        return 0
+
+    @property
+    def stream_source(self):
+        """Return the stream source."""
+        return self._input
+
     @property
     def name(self):
         """Return the name of this camera."""