Add <audio> tag streaming support for mp3 files

lib/file-stream.js

@@ -99,12 +99,15 @@ FileStream.prototype.pipe = function (dst) {
   var self = this
   var pipe = stream.Readable.prototype.pipe
 
-  if (dst && dst.nodeName === 'VIDEO') { // <video> tag
+  if (dst && dst.nodeName === 'VIDEO' || dst.nodeName === 'AUDIO') { // <video> and <audio> tag
     var type = self._extname === '.webm'
       ? 'video/webm; codecs="vorbis,vp8"'
       : self._extname === '.mp4'
         ? 'video/mp4; codecs="avc1.42c01e,mp4a.40.2"'
-        : undefined
+        : self._extname === '.mp3'
+          ? 'audio/mpeg'
+          : undefined
+    // TODO: consider renaming VideoStream to MediaStream, since it supports audio as well.
     return pipe.call(self, new VideoStream(dst, { type: type }))
   } else
     return pipe.call(self, dst)