rtsp source: fix regression (#949)

This caused a periodic disconnection when sourceOnDemand is yes

internal/core/path.go

@@ -439,12 +439,8 @@ func (pa *path) run() {
 						}
 						pa.setupPlayRequestsOnHold = nil
 
-						if len(pa.readers) > 0 {
-							pa.onDemandStaticSourceState = pathOnDemandStateReady
-						} else {
 						pa.onDemandStaticSourceScheduleClose()
 					}
-					}
 
 					req.res <- pathSourceStaticSetReadyRes{stream: pa.stream}
 				} else {
@@ -859,12 +855,8 @@ func (pa *path) handlePublisherRecord(req pathPublisherRecordReq) {
 		}
 		pa.setupPlayRequestsOnHold = nil
 
-		if len(pa.readers) > 0 {
-			pa.onDemandPublisherState = pathOnDemandStateReady
-		} else {
 		pa.onDemandPublisherScheduleClose()
 	}
-	}
 
 	req.res <- pathPublisherRecordRes{stream: pa.stream}
 }
@@ -887,13 +879,17 @@ func (pa *path) handleReaderRemove(req pathReaderRemoveReq) {
 	close(req.res)
 
 	if len(pa.readers) == 0 {
-		if pa.hasOnDemandStaticSource() && pa.onDemandStaticSourceState == pathOnDemandStateReady {
+		if pa.hasOnDemandStaticSource() {
+			if pa.onDemandStaticSourceState == pathOnDemandStateReady {
 				pa.onDemandStaticSourceScheduleClose()
-		} else if pa.hasOnDemandPublisher() && pa.onDemandPublisherState == pathOnDemandStateReady {
+			}
+		} else if pa.hasOnDemandPublisher() {
+			if pa.onDemandPublisherState == pathOnDemandStateReady {
 				pa.onDemandPublisherScheduleClose()
 			}
 		}
 	}
+}
 
 func (pa *path) handleReaderSetupPlay(req pathReaderSetupPlayReq) {
 	if pa.sourceReady {
@@ -923,11 +919,19 @@ func (pa *path) handleReaderSetupPlay(req pathReaderSetupPlayReq) {
 func (pa *path) handleReaderSetupPlayPost(req pathReaderSetupPlayReq) {
 	pa.readers[req.author] = pathReaderStatePrePlay
 
-	if pa.hasOnDemandPublisher() && pa.onDemandPublisherState == pathOnDemandStateClosing {
+	if pa.hasOnDemandStaticSource() {
+		if pa.onDemandStaticSourceState == pathOnDemandStateClosing {
+			pa.onDemandStaticSourceState = pathOnDemandStateReady
+			pa.onDemandStaticSourceCloseTimer.Stop()
+			pa.onDemandStaticSourceCloseTimer = newEmptyTimer()
+		}
+	} else if pa.hasOnDemandPublisher() {
+		if pa.onDemandPublisherState == pathOnDemandStateClosing {
 			pa.onDemandPublisherState = pathOnDemandStateReady
 			pa.onDemandPublisherCloseTimer.Stop()
 			pa.onDemandPublisherCloseTimer = newEmptyTimer()
 		}
+	}
 
 	req.res <- pathReaderSetupPlayRes{
 		path:   pa,