[player] Don't stop/clear queue on speaker 'prevent-playback' or 'busy'

When 'prevent-playback' or 'busy' is sent by a single playing speaker, we just
want to pause playback and not clear the queue

Closes #1553

src/outputs/airplay.c

@@ -3705,7 +3705,7 @@ airplay_device_cb(const char *name, const char *type, const char *domain, const
 	}
     }
 
-  DPRINTF(E_DBG, L_AIRPLAY, "Event for AirPlay device '%s' (port %d, id %" PRIx64 ")\n", name, port, id);
+  DPRINTF(E_DBG, L_AIRPLAY, "Event for AirPlay device '%s' (port %d, id %" PRIx64 ", Active-Remote %" PRIu32 ")\n", name, port, id, (uint32_t)id);
 
   devcfg = cfg_gettsec(cfg, "airplay", name);
   if (devcfg && cfg_getbool(devcfg, "exclude"))

src/outputs/raop.c

@@ -4080,7 +4080,7 @@ raop_device_cb(const char *name, const char *type, const char *domain, const cha
     }
   device_name++;
 
-  DPRINTF(E_DBG, L_RAOP, "Event for AirPlay device '%s' (port %d, id %" PRIx64 ")\n", device_name, port, id);
+  DPRINTF(E_DBG, L_RAOP, "Event for AirPlay device '%s' (port %d, id %" PRIx64 ", Active-Remote %" PRIu32 ")\n", device_name, port, id, (uint32_t)id);
 
   devcfg = cfg_gettsec(cfg, "airplay", device_name);
   if (devcfg && cfg_getbool(devcfg, "exclude"))

src/player.c

@@ -2750,10 +2750,10 @@ speaker_prevent_playback_set_bh(void *arg, int *retval)
 {
   struct speaker_attr_param *param = arg;
 
-  if (outputs_sessions_count() == 0)
+  if (player_state == PLAY_PLAYING && outputs_sessions_count() == 0)
     {
-      DPRINTF(E_INFO, L_PLAYER, "Ending playback, speaker (id=%" PRIu64 ") set 'busy' or 'prevent-playback' flag\n", param->spk_id);
-      pb_abort(); // TODO Would be better for the user if we paused, but we don't have a handy function for that
+      DPRINTF(E_INFO, L_PLAYER, "Suspending playback, speaker (id=%" PRIu64 ") set 'busy' or 'prevent-playback' flag\n", param->spk_id);
+      pb_suspend(); // Don't want to use pb_abort here, since that may clear the queue
     }
   else
     status_update(player_state, LISTENER_SPEAKER | LISTENER_VOLUME);