allow player startup without feeds

cmd/mxl-player/main.go

@@ -59,7 +59,7 @@ type appArgs struct {
 
 func printCliHelp(fs *pflag.FlagSet) {
 	fmt.Printf("%s %s\n", APP_NAME, APP_VER)
-	fmt.Println("Usage: mxl-player -d <domain> (-v <uuid> | -a <uuid>) [--max-attempts <count>] [-f] [-h]")
+	fmt.Println("Usage: mxl-player [-d <domain>] [-v <uuid>] [-a <uuid>] [options]")
 	fmt.Println("                  [-g <gpu-id>] [-p <playback-id>] [--verbose]")
 	fmt.Println("   or: mxl-player [--list-playback] [--list-gpu]")
 	fmt.Println("   or: mxl-player (and set everything in GUI)")
@@ -68,13 +68,20 @@ func printCliHelp(fs *pflag.FlagSet) {
 }
 
 func printUsage(w io.Writer) {
-	fmt.Fprintln(w, "Usage: mxl-player -d <domain> (-v <uuid> | -a <uuid>) [-f] [-h]")
+	fmt.Fprintln(w, "Usage: mxl-player [-d <domain>] [-v <uuid>] [-a <uuid>] [options]")
 	fmt.Fprintln(w, "Try 'mxl-player -h' for more information.")
 }
 
 func checkMXLargs(args appArgs) {
+	if args.VideoFlowId == "" && args.AudioFlowId == "" {
+		return
+	}
+
 	if args.Domain == "" {
-		fmt.Fprintln(os.Stderr, "You should provide valid MXL domain and UUID of at least one flow")
+		fmt.Fprintln(
+			os.Stderr,
+			"You must provide a domain when a feed UUID is configured",
+		)
 		printUsage(os.Stderr)
 		os.Exit(2)
 	}
@@ -86,11 +93,6 @@ func checkMXLargs(args appArgs) {
 		printUsage(os.Stderr)
 		os.Exit(2)
 	}
-	if args.VideoFlowId == "" && args.AudioFlowId == "" {
-		fmt.Fprintln(os.Stderr, "You must provide at least 1 MXL flow UUID")
-		printUsage(os.Stderr)
-		os.Exit(2)
-	}
 }
 
 func main() {
@@ -146,7 +148,7 @@ func main() {
 		checkMXLargs(args)
 	}
 	// path selection
-	useVideoSlot := args.VideoFlowId != "" && args.AudioFlowId == ""
+	useVideoSlot := args.AudioFlowId == ""
 
 	runtime.LockOSThread()
 	if err := sdl.Load(); err != nil {
@@ -300,7 +302,7 @@ func main() {
 			syncSrc.Width(), syncSrc.Height(), aChans, audioBatch)
 	case args.VideoFlowId != "":
 		// VideoSlot owns opening and closing the video reader.
-	default:
+	case args.AudioFlowId != "":
 		audioSrc, err = source.OpenAudio(args.Domain, args.AudioFlowId)
 		if err != nil {
 			log.Fatalf("audio source: %v", err)
@@ -320,6 +322,8 @@ func main() {
 		}
 		sdl.ResumeAudioStreamDevice(audioStream)
 		fmt.Printf("audio: %dch %d/%d Hz\n", aChans, audioSrc.Rate().Num, audioSrc.Rate().Den)
+	default:
+		// No configured feeds. Renderer and GUI use the placeholder.
 	}
 
 	defer func() {
@@ -385,7 +389,7 @@ func main() {
 		audioStr  string = args.AudioFlowId
 		showStats bool   = true
 	)
-	videoActive := useVideoSlot
+	videoActive := args.VideoFlowId != ""
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -529,7 +533,7 @@ func main() {
 				playback.FeedConfig{
 					Domain: args.Domain,
 					UUID:   args.VideoFlowId,
-					Active: true,
+					Active: args.VideoFlowId != "",
 				},
 				videoCommands,
 			)

imgui.ini

@@ -14,7 +14,7 @@ Size=200,200
 Collapsed=0
 
 [Window][Connection]
-Pos=202,343
+Pos=74,351
 Size=799,226
 Collapsed=0