Decoder.GetAudioExt() return extension with .

algo/common/raw.go

@@ -27,7 +27,7 @@ func (d RawDecoder) GetAudioData() []byte {
 }
 
 func (d RawDecoder) GetAudioExt() string {
-	return d.audioExt
+	return "." + d.audioExt
 }
 
 func (d RawDecoder) GetMeta() Meta {

algo/kwm/kwm.go

@@ -40,7 +40,7 @@ func (d *Decoder) GetAudioData() []byte {
 }
 
 func (d *Decoder) GetAudioExt() string {
-	return d.outputExt
+	return "." + d.outputExt
 }
 
 func (d *Decoder) GetMeta() common.Meta {

algo/ncm/ncm.go

@@ -201,7 +201,9 @@ func (d *Decoder) Decode() error {
 
 func (d Decoder) GetAudioExt() string {
 	if d.meta != nil {
-		return d.meta.GetFormat()
+		if format := d.meta.GetFormat(); format != "" {
+			return "." + d.meta.GetFormat()
+		}
 	}
 	return ""
 }

algo/qmc/qmc.go

@@ -84,7 +84,10 @@ func (d Decoder) GetAudioData() []byte {
 }
 
 func (d Decoder) GetAudioExt() string {
-	return d.audioExt
+	if d.audioExt != "" {
+		return "." + d.audioExt
+	}
+	return ""
 }
 
 func (d Decoder) GetMeta() common.Meta {

algo/tm/tm.go

@@ -25,7 +25,10 @@ func (d *Decoder) GetAudioData() []byte {
 }
 
 func (d *Decoder) GetAudioExt() string {
-	return d.audioExt
+	if d.audioExt != "" {
+		return "." + d.audioExt
+	}
+	return ""
 }
 
 func (d *Decoder) GetMeta() common.Meta {

algo/xm/xm.go

@@ -38,7 +38,11 @@ func (d *Decoder) GetAudioData() []byte {
 }
 
 func (d *Decoder) GetAudioExt() string {
-	return d.outputExt
+	if d.outputExt != "" {
+		return "." + d.outputExt
+
+	}
+	return ""
 }
 
 func (d *Decoder) GetMeta() common.Meta {

cmd/um/main.go

@@ -119,7 +119,7 @@ func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFu
 
 	outExt := dec.GetAudioExt()
 	if outExt == "" {
-		outExt = "mp3"
+		outExt = ".mp3"
 	}
 	filenameOnly := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))