fix parsing of HLS 'DEFAULT' attribute so variants can correctly be i…

…dentified as primary, preventing arbitrary language selection in playlists with multiple variants

lib/hls/hls_parser.js

@@ -1207,7 +1207,7 @@ shaka.hls.HlsParser = class {
     // "AUTOSELECT=YES".  A value of "AUTOSELECT=NO" would imply that it may
     // only be selected explicitly by the user, and we don't have a way to
     // represent that in our model.
-    const defaultAttrValue = tag.getAttribute('DEFAULT');
+    const defaultAttrValue = tag.getAttributeValue('DEFAULT');
     const primary = defaultAttrValue == 'YES';
 
     const channelsCount = type == 'audio' ? this.getChannelsCount_(tag) : null;

test/hls/hls_parser_unit.js

@@ -785,7 +785,7 @@ describe('HlsParser', () => {
       'RESOLUTION=960x540,FRAME-RATE=120,AUDIO="aud2"\n',
       'video2\n',
       '#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aud1",LANGUAGE="eng",',
-      'URI="audio"\n',
+      'DEFAULT=YES,URI="audio"\n',
       '#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aud2",LANGUAGE="fr",',
       'URI="audio2"\n',
     ].join('');
@@ -803,6 +803,7 @@ describe('HlsParser', () => {
       manifest.anyTimeline();
       manifest.addPartialVariant((variant) => {
         variant.bandwidth = 200;
+        variant.primary = true;
         variant.addPartialStream(ContentType.VIDEO, (stream) => {
           stream.size(960, 540);
         });
@@ -812,6 +813,7 @@ describe('HlsParser', () => {
       });
       manifest.addPartialVariant((variant) => {
         variant.bandwidth = 300;
+        variant.primary = false;
         variant.addPartialStream(ContentType.VIDEO, (stream) => {
           stream.size(960, 540);
         });