Add play/pause functionality for Vizio Smartcast media_player entities (#108896)

* Add play/pause functionality to vizio integration

Leverages existing pyvizio functionality. My impression is that it also
works for soundbars based on https://github.com/exiva/Vizio_SmartCast_API/issues/19.

* Set vizio assumed_state to True

The Vizio API is only capable of indicating whether the device is on
or off and not whether it's playing/paused/idle. Setting assumed_state
to True gives us separate Play and Pause buttons versus the (useless)
merged Play/Pause button we would get otherwise.

homeassistant/components/vizio/const.py

@@ -52,7 +52,9 @@ DEVICE_ID = "pyvizio"
 DOMAIN = "vizio"
 
 COMMON_SUPPORTED_COMMANDS = (
-    MediaPlayerEntityFeature.SELECT_SOURCE
+    MediaPlayerEntityFeature.PAUSE
+    | MediaPlayerEntityFeature.PLAY
+    | MediaPlayerEntityFeature.SELECT_SOURCE
     | MediaPlayerEntityFeature.TURN_ON
     | MediaPlayerEntityFeature.TURN_OFF
     | MediaPlayerEntityFeature.VOLUME_MUTE

homeassistant/components/vizio/media_player.py

@@ -159,6 +159,7 @@ class VizioDevice(MediaPlayerEntity):
         )
         self._device = device
         self._max_volume = float(device.get_max_volume())
+        self._attr_assumed_state = True
 
         # Entity class attributes that will change with each update (we only include
         # the ones that are initialized differently from the defaults)
@@ -483,3 +484,11 @@ class VizioDevice(MediaPlayerEntity):
                 num = int(self._max_volume * (self._attr_volume_level - volume))
                 await self._device.vol_down(num=num, log_api_exception=False)
                 self._attr_volume_level = volume
+
+    async def async_media_play(self) -> None:
+        """Play whatever media is currently active."""
+        await self._device.play(log_api_exception=False)
+
+    async def async_media_pause(self) -> None:
+        """Pause whatever media is currently active."""
+        await self._device.pause(log_api_exception=False)

tests/components/vizio/test_media_player.py

@@ -28,6 +28,8 @@ from homeassistant.components.media_player import (
     ATTR_SOUND_MODE,
     DOMAIN as MP_DOMAIN,
     SERVICE_MEDIA_NEXT_TRACK,
+    SERVICE_MEDIA_PAUSE,
+    SERVICE_MEDIA_PLAY,
     SERVICE_MEDIA_PREVIOUS_TRACK,
     SERVICE_SELECT_SOUND_MODE,
     SERVICE_SELECT_SOURCE,
@@ -443,6 +445,8 @@ async def test_services(
         "eq",
         "Music",
     )
+    await _test_service(hass, MP_DOMAIN, "play", SERVICE_MEDIA_PLAY, None)
+    await _test_service(hass, MP_DOMAIN, "pause", SERVICE_MEDIA_PAUSE, None)
 
 
 async def test_options_update(