fix(dash): handle case if no period base url, add unique track id

lib/audio.js

@@ -67,6 +67,7 @@ const checkIsDescriptive = (accessibilities = []) => {
 };
 
 const createAudioTrack = ({
+  id,
   codec,
   channels,
   bitrate,
@@ -77,6 +78,7 @@ const createAudioTrack = ({
 }) => {
   const parsedBitrate = parseBitrate(Number(bitrate));
   return {
+    id,
     codec,
     bitrate: parsedBitrate,
     segments,

lib/dash.js

@@ -57,8 +57,11 @@ const parseBaseUrl = (manifestUrl, mpd, period, representation) => {
   if (!manifestBaseUrl) manifestBaseUrl = manifestUrl;
   else if (!manifestBaseUrl.startsWith('https://'))
     manifestBaseUrl = new URL(manifestBaseUrl, manifestUrl).toString();
-  const periodBaseUrl = new URL(period.getBaseUrl(), manifestBaseUrl).toString();
-  const representationBaseUrl = new URL(representation.getBaseUrl(), periodBaseUrl).toString();
+  const periodBaseUrl = new URL(period.getBaseUrl() || '', manifestBaseUrl).toString();
+  const representationBaseUrl = new URL(
+    representation.getBaseUrl() || '',
+    periodBaseUrl
+  ).toString();
   return representationBaseUrl;
 };
 
@@ -79,15 +82,16 @@ const parseCodecs = (representation, contentType, mimeType) => {
 const parseLanguage = (representation, adaptationSet, fallbackLanguage) => {
   let language = '';
   const options = [];
+  const lang = representation.get('lang');
+  const id = representation.get('id');
   if (representation) {
-    const { lang, id } = representation.attributes;
     options.push(lang);
     if (id) {
       const m = id.match(/\w+_(\w+)=\d+/);
       if (m) options.push(m.group(1));
     }
   }
-  options.push(adaptationSet.attributes.lang);
+  options.push(adaptationSet.get('lang'));
   if (fallbackLanguage) options.push(fallbackLanguage);
   for (const option of options) {
     const value = (option || '').trim();
@@ -269,9 +273,23 @@ const parseManifest = async (text, url, fallbackLanguage) => {
       const accessibilities = adaptationSet.getAll('Accessibility');
       const roles = adaptationSet.getAll('Role');
 
+      const id = [
+        get('id'),
+        get('audioTrackId'),
+        period.get('id'),
+        mpd.get('id'),
+        bitrate,
+        codecs,
+        language,
+        new URL(baseUrl).hostname,
+      ]
+        .filter(Boolean)
+        .join('-');
+
       switch (contentType) {
         case 'video': {
           const track = createVideoTrack({
+            id,
             codec: parseVideoCodec(codecs),
             dynamicRange: parseDynamicRange(codecs, supplementalProps, essentialProps),
             bitrate,
@@ -286,6 +304,7 @@ const parseManifest = async (text, url, fallbackLanguage) => {
         }
         case 'audio': {
           const track = createAudioTrack({
+            id,
             codec: parseAudioCodec(codecs),
             channels: get('AudioChannelConfiguration').get('value'),
             jointObjectCoding: getDolbyDigitalPlusComplexityIndex(supplementalProps),
@@ -299,6 +318,7 @@ const parseManifest = async (text, url, fallbackLanguage) => {
         }
         case 'text': {
           const track = createSubtitleTrack({
+            id,
             codec: parseSubtitleCodec(codecs || 'vtt'),
             isClosedCaption: checkIsClosedCaption(roles),
             isSdh: checkIsSdh(accessibilities),

lib/subtitle.js

@@ -76,8 +76,17 @@ const checkIsForced = (roles = []) => {
   return false;
 };
 
-const createSubtitleTrack = ({ codec, isClosedCaption, isSdh, isForced, language, segments }) => {
+const createSubtitleTrack = ({
+  id,
+  codec,
+  isClosedCaption,
+  isSdh,
+  isForced,
+  language,
+  segments,
+}) => {
   return {
+    id,
     codec,
     isClosedCaption,
     isSdh,

lib/video.js

@@ -82,6 +82,7 @@ const parseDynamicRangeFromCicp = (primaries, transfer, matrix) => {
 };
 
 const createVideoTrack = ({
+  id,
   codec,
   dynamicRange,
   bitrate,
@@ -95,6 +96,7 @@ const createVideoTrack = ({
   const parsedWidth = Number(width);
   const parsedHeight = Number(height);
   return {
+    id,
     codec,
     bitrate: parsedBitrate,
     segments,