sout: chromecast: check app presence on status

Stop sending and disconnect when app has changed.

modules/stream_out/chromecast/cast.cpp

@@ -609,13 +609,24 @@ static int processMessage(sout_stream_t *p_stream, const castchannel::CastMessag
         if (type == "RECEIVER_STATUS")
         {
             json_value applications = (*p_data)["status"]["applications"];
+            const json_value *p_app = NULL;
             for (unsigned i = 0; i < applications.u.array.length; ++i)
             {
                 std::string appId(applications[i]["appId"]);
                 if (appId == APP_ID)
+                {
+                    p_app = &applications[i];
+                    vlc_mutex_lock(&p_sys->lock);
+                    if (p_sys->appTransportId.empty())
                         p_sys->appTransportId = std::string(applications[i]["transportId"]);
+                    vlc_mutex_unlock(&p_sys->lock);
+                    break;
                 }
-            vlc_mutex_locker locker(&p_sys->lock);
+            }
+
+            vlc_mutex_lock(&p_sys->lock);
+            if ( p_app )
+            {
                 if (!p_sys->appTransportId.empty()
                         && p_sys->i_status == CHROMECAST_AUTHENTICATED)
                 {
@@ -627,6 +638,24 @@ static int processMessage(sout_stream_t *p_stream, const castchannel::CastMessag
                 }
             }
             else
+            {
+                switch(p_sys->i_status)
+                {
+                /* If the app is no longer present */
+                case CHROMECAST_APP_STARTED:
+                case CHROMECAST_MEDIA_LOAD_SENT:
+                    msg_Warn(p_stream, "app is no longer present. closing");
+                    msgClose(p_stream, p_sys->appTransportId);
+                    i_ret = -1;
+                    // ft
+                default:
+                    break;
+                }
+
+            }
+            vlc_mutex_unlock(&p_sys->lock);
+        }
+        else
         {
             msg_Err(p_stream, "Receiver command not supported: %s",
                     msg.payload_utf8().c_str());