audio is prepared, next is MXL part

cmd/mxl-pattern/main.go

@@ -52,6 +52,7 @@ type appArgs struct {
 
 	audioChannels     uint8
 	audioSamplingFreq string
+	audioLevel        string
 	audioUUID         string
 }
 
@@ -160,7 +161,17 @@ func validateVideoArgs(args *appArgs) error {
 }
 
 func validateAudioArgs(args *appArgs) error {
-	if args.audioFlowDefFile != "" || args.audioChannels == 0 {
+	if args.audioFlowDefFile == "" && args.audioChannels == 0 {
+		return nil
+	}
+	if _, ok := audioLevels[args.audioLevel]; !ok {
+		return fmt.Errorf(
+			"unsupported audio level %q (supported: %s)",
+			args.audioLevel,
+			sortedMapKeys(audioLevels),
+		)
+	}
+	if args.audioFlowDefFile != "" {
 		return nil
 	}
 	if _, exists := samplingRates[args.audioSamplingFreq]; !exists {
@@ -272,6 +283,11 @@ var patterns = map[string]pattern{
 	},
 }
 
+var audioLevels = map[string]float64{
+	"ebu":   audio.LevelEBUDBFS,
+	"smpte": audio.LevelSMPTEDBFS,
+}
+
 func listPatterns(w io.Writer) {
 	fmt.Fprintln(w, "List of available video patterns:")
 	names := make([]string, 0, len(patterns))
@@ -327,9 +343,10 @@ func addFlags(fs *pflag.FlagSet, args *appArgs) {
 	fs.StringVar(&args.videoFPS, "fps", "25", "Video pattern FPS")
 	fs.StringVar(&args.videoUUID, "video-id", "", "Video UUID. Will be created, if not provided")
 	// Audio pattern flags
-	fs.Uint8VarP(&args.audioChannels, "channel", "c", 0, "Amount of audio channels. Each channel: num * 1kHz. Zero = no sound [TODO]")
-	fs.StringVarP(&args.audioSamplingFreq, "freq", "f", "48", "Sampling frequency of test audio feed in kHz [TODO]")
-	fs.StringVar(&args.audioUUID, "audio-id", "", "Audio UUID. Will be created, if not provided [TODO]")
+	fs.Uint8VarP(&args.audioChannels, "channel", "c", 0, "Amount of audio channels. Each channel: num * 1kHz")
+	fs.StringVarP(&args.audioSamplingFreq, "freq", "f", "48", "Sampling frequency of test audio feed in kHz")
+	fs.StringVar(&args.audioLevel, "audio-level", "ebu", "Audio alignment level: ebu (-18 dBFS) or smpte (-20 dBFS)")
+	fs.StringVar(&args.audioUUID, "audio-id", "", "Audio UUID. Will be created, if not provided")
 }
 
 func parseArgs(argv []string, stdout, stderr io.Writer) (parseResult, error) {
@@ -425,6 +442,10 @@ func buildAudioConfig(args appArgs) (*audio.Config, error) {
 	if args.audioFlowDefFile == "" && args.audioChannels == 0 {
 		return nil, nil
 	}
+	levelDBFS, ok := audioLevels[args.audioLevel]
+	if !ok {
+		return nil, fmt.Errorf("unsupported audio level %q", args.audioLevel)
+	}
 
 	var definition flowdef.Audio
 	if args.audioFlowDefFile != "" {
@@ -452,7 +473,10 @@ func buildAudioConfig(args appArgs) (*audio.Config, error) {
 		}
 	}
 
-	return &audio.Config{Definition: definition}, nil
+	return &audio.Config{
+		Definition: definition,
+		LevelDBFS:  levelDBFS,
+	}, nil
 }
 
 func main() {