add parameter disablePublisherOverride to disable publisher override (#230)

internal/conf/path.go

@@ -74,6 +74,7 @@ type PathConf struct {
 	SourceOnDemandStartTimeout time.Duration             `yaml:"sourceOnDemandStartTimeout"`
 	SourceOnDemandCloseAfter   time.Duration             `yaml:"sourceOnDemandCloseAfter"`
 	SourceRedirect             string                    `yaml:"sourceRedirect"`
+	DisablePublisherOverride   bool                      `yaml:"disablePublisherOverride"`
 	Fallback                   string                    `yaml:"fallback"`
 	RunOnInit                  string                    `yaml:"runOnInit"`
 	RunOnInitRestart           bool                      `yaml:"runOnInitRestart"`

internal/path/path.go

@@ -689,6 +689,11 @@ func (pa *Path) onClientAnnounce(req client.AnnounceReq) {
 	}
 
 	if pa.source != nil {
+		if pa.conf.DisablePublisherOverride {
+			req.Res <- client.AnnounceRes{nil, fmt.Errorf("another client is already publishing on path '%s'", pa.name)} //nolint:govet
+			return
+		}
+
 		pa.Log(logger.Info, "disconnecting existing publisher")
 		curPublisher := pa.source.(client.Client)
 		pa.removeClient(curPublisher)

main_clientrtsp_test.go

@@ -448,6 +448,7 @@ func TestClientRTSPAutomaticProtocol(t *testing.T) {
 }
 
 func TestClientRTSPPublisherOverride(t *testing.T) {
+	t.Run("enabled", func(t *testing.T) {
 		p, ok := testProgram("rtmpDisable: yes\n")
 		require.Equal(t, true, ok)
 		defer p.close()
@@ -487,6 +488,51 @@ func TestClientRTSPPublisherOverride(t *testing.T) {
 		require.NoError(t, err)
 		defer dest.close()
 		require.Equal(t, 0, dest.wait())
+	})
+
+	t.Run("disabled", func(t *testing.T) {
+		p, ok := testProgram("rtmpDisable: yes\n" +
+			"paths:\n" +
+			"  all:\n" +
+			"    disablePublisherOverride: yes\n")
+		require.Equal(t, true, ok)
+		defer p.close()
+
+		source1, err := newContainer("ffmpeg", "source1", []string{
+			"-re",
+			"-stream_loop", "-1",
+			"-i", "emptyvideo.mkv",
+			"-c", "copy",
+			"-f", "rtsp",
+			"rtsp://" + ownDockerIP + ":8554/teststream",
+		})
+		require.NoError(t, err)
+		defer source1.close()
+
+		time.Sleep(1 * time.Second)
+
+		source2, err := newContainer("ffmpeg", "source2", []string{
+			"-re",
+			"-stream_loop", "-1",
+			"-i", "emptyvideo.mkv",
+			"-c", "copy",
+			"-f", "rtsp",
+			"rtsp://" + ownDockerIP + ":8554/teststream",
+		})
+		require.NoError(t, err)
+		defer source2.close()
+		require.NotEqual(t, 0, source2.wait())
+
+		dest, err := newContainer("ffmpeg", "dest", []string{
+			"-i", "rtsp://" + ownDockerIP + ":8554/teststream",
+			"-vframes", "1",
+			"-f", "image2",
+			"-y", "/dev/null",
+		})
+		require.NoError(t, err)
+		defer dest.close()
+		require.Equal(t, 0, dest.wait())
+	})
 }
 
 func TestClientRTSPNonCompliantFrameSize(t *testing.T) {

rtsp-simple-server.yml

@@ -114,8 +114,12 @@ paths:
     # redirected to.
     sourceRedirect:
 
-    # fallback stream to redirect clients to when nobody is publishing to this path.
-    # this can be a relative path  (i.e. /otherstream) or an absolute RTSP URL.
+    # if the source is "record" and a client is publishing, do not allow another
+    # client to disconnect the former and publish in its place.
+    disablePublisherOverride: no
+
+    # if the source is "record" and no one is publishing, redirect readers to this
+    # path. It can be can be a relative path  (i.e. /otherstream) or an absolute RTSP URL.
     fallback:
 
     # username required to publish.