fix(HLS): Fix detection of Media Playlist for audio and video only in…

… MP4 (#4803)

lib/hls/hls_parser.js

@@ -618,9 +618,23 @@ shaka.hls.HlsParser = class {
       if (playlist.segments.length) {
         const parsedUri = new goog.Uri(playlist.segments[0].absoluteUri);
         const extension = parsedUri.getPath().split('.').pop();
-        const mimeType = HlsParser.RAW_FORMATS_TO_MIME_TYPES_[extension];
+        let mimeType = HlsParser.RAW_FORMATS_TO_MIME_TYPES_[extension];
         if (mimeType) {
           fullMimeType = mimeType;
+        } else if (extension === 'ts') {
+          // TODO: Fetch one segment a use the TsParser to analize if there is
+          // video, audio or both.
+        } else if (extension === 'mp4') {
+          // TODO: Fetch one segment a use the Mp4Parser to analize if there is
+          // video, audio or both.
+        } else if (HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_[extension]) {
+          mimeType = HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_[extension];
+          const defaultAudioCodec = this.config_.hls.defaultAudioCodec;
+          fullMimeType = `${mimeType}; codecs="${defaultAudioCodec}"`;
+        } else if (HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_[extension]) {
+          mimeType = HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_[extension];
+          const defaultVideoCodec = this.config_.hls.defaultVideoCodec;
+          fullMimeType = `${mimeType}; codecs="${defaultVideoCodec}"`;
         }
       }