merge all rooms (inc. AVR)

app.py

@@ -422,12 +422,22 @@ def api_mute():
 @handle_errors
 def api_playback():
     """Start or stop a room. Send 'state' to be explicit, or leave it out to
-    flip whatever the speakers are actually doing."""
+    flip whatever the speakers are actually doing.
+
+    For the AVR this goes around HEOS to the Zidoo, the same way /api/seek
+    does and for the same reason: what the AVR's card shows playing is a
+    device on one of its inputs, which HEOS can no more pause than seek in.
+    The Zidoo has no 'stop', only play and pause."""
     data = _payload()
     key = _target_from(data)
     state = data.get("state")
     if state is not None and state not in ("play", "pause", "stop"):
         raise ValueError("'state' must be play, pause or stop -- or left out to toggle")
+    if key == config.HOST_KEY:
+        if state == "stop":
+            raise ValueError("The AVR's card plays a device on one of its inputs, which can only "
+                             "play or pause -- 'stop' is for a HEOS room")
+        return jsonify({"target": key, "state": controller.zidoo_play_state(state)})
     return jsonify({"target": key, "state": controller.toggle_play(key, state)})