--no-video flag

internal/app/app.go

@@ -19,22 +19,27 @@ const (
 
 type Config struct {
 	Domain string
-	Video  video.Config
+	Video  *video.Config
 	Audio  *audio.Config
 }
 
 func Run(ctx context.Context, cfg Config) (runErr error) {
+	if err := validateConfig(cfg); err != nil {
+		return err
+	}
+
 	log.Printf("%s %s", Name, Version)
 	log.Printf("Domain: %s", cfg.Domain)
-	log.Printf("Video: %dx%d %d/%d",
-		cfg.Video.Width(), cfg.Video.Height(), cfg.Video.Rate().Num, cfg.Video.Rate().Den)
-	log.Printf("Video ID: %s", cfg.Video.ID())
+	if cfg.Video != nil {
+		log.Printf("Video: %dx%d %d/%d",
+			cfg.Video.Width(), cfg.Video.Height(), cfg.Video.Rate().Num, cfg.Video.Rate().Den)
+		log.Printf("Video ID: %s", cfg.Video.ID())
+	}
 	if cfg.Audio != nil {
 		log.Printf("Audio: %d channels %d/%d Hz %.0f dBFS",
 			cfg.Audio.Channels(), cfg.Audio.Rate().Num, cfg.Audio.Rate().Den, cfg.Audio.LevelDBFS)
 		log.Printf("Audio ID: %s", cfg.Audio.ID())
 	}
-
 	inst, err := mxl.NewInstance(cfg.Domain, "")
 	if err != nil {
 		return fmt.Errorf("initialize MXL domain %q: %w", cfg.Domain, err)
@@ -45,13 +50,14 @@ func Run(ctx context.Context, cfg Config) (runErr error) {
 		}
 	}()
 
-	runners := []Runner{
-		{
+	runners := make([]Runner, 0, 2)
+	if cfg.Video != nil {
+		runners = append(runners, Runner{
 			Name: "video",
 			Run: func(ctx context.Context) error {
-				return video.Run(ctx, inst, cfg.Video)
+				return video.Run(ctx, inst, *cfg.Video)
 			},
-		},
+		})
 	}
 	if cfg.Audio != nil {
 		runners = append(runners, Runner{
@@ -64,3 +70,10 @@ func Run(ctx context.Context, cfg Config) (runErr error) {
 
 	return RunConcurrent(ctx, runners...)
 }
+
+func validateConfig(cfg Config) error {
+	if cfg.Video == nil && cfg.Audio == nil {
+		return fmt.Errorf("at least one media flow must be enabled")
+	}
+	return nil
+}

internal/app/app_test.go

@@ -0,0 +1,15 @@
+package app
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestValidateConfigRejectsNoFlows(t *testing.T) {
+	err := validateConfig(Config{
+		Domain: "/unused",
+	})
+	if err == nil || !strings.Contains(err.Error(), "at least one media flow") {
+		t.Fatalf("error = %v, want no-flow validation error", err)
+	}
+}