fix(subsonic): send valid content-type with http.ServeStream

scanner/scanner.go

@@ -277,7 +277,7 @@ func (s *Scanner) scanDir(tx *db.DB, c *Context, musicDir string, absPath string
 			cover = item.Name()
 			continue
 		}
-		if mime := mime.FromExtension(ext(item.Name())); mime != "" {
+		if mime := mime.TypeByAudioExtension(filepath.Ext(item.Name())); mime != "" {
 			tracks = append(tracks, item.Name())
 			continue
 		}
@@ -578,13 +578,6 @@ func (s *Scanner) cleanGenres(c *Context) error {
 	return nil
 }
 
-func ext(name string) string {
-	if ext := filepath.Ext(name); len(ext) > 0 {
-		return ext[1:]
-	}
-	return ""
-}
-
 func isCover(name string) bool {
 	switch path := strings.ToLower(name); path {
 	case