feat: Support for vtt (#13)

Author: shahlabs

src/toM3u8.js

@@ -15,6 +15,14 @@ export const formatAudioPlaylist = ({ attributes, segments }) => {
 };
 
 export const formatVttPlaylist = ({ attributes, segments }) => {
+  if (segments === undefined) {
+    segments = [{
+      uri: attributes.url,
+      timeline: attributes.periodIndex,
+      resolvedUri: attributes.url || '',
+      duration: attributes.sourceDuration
+    }];
+  }
   return {
     attributes: {
       NAME: attributes.id,
@@ -86,6 +94,7 @@ export const formatVideoPlaylist = ({ attributes, segments }) => {
     attributes: {
       NAME: attributes.id,
       AUDIO: 'audio',
+      SUBTITLES: 'subs',
       RESOLUTION: {
         width: parseInt(attributes.width, 10),
         height: parseInt(attributes.height, 10)
@@ -141,8 +150,7 @@ export const toM3u8 = dashPlaylists => {
     master.mediaGroups.AUDIO.audio = organizeAudioPlaylists(audioPlaylists);
   }
 
-  // TODO: vtt playlists not yet supported
-  if (vttPlaylists.length && false) {
+  if (vttPlaylists.length) {
     master.mediaGroups.SUBTITLES.subs = organizeVttPlaylists(vttPlaylists);
   }
 

test/manifests/maat_vtt_segmentTemplate.js

@@ -101,9 +101,6 @@ export const parsedManifest = {
       }
     },
     ['CLOSED-CAPTIONS']: {},
-    // Subtitles feature is turned off
-    SUBTITLES: {},
-    /*
     SUBTITLES: {
       subs: {
         en: {
@@ -118,7 +115,12 @@ export const parsedManifest = {
             },
             endList: true,
             resolvedUri: 'https://example.com/en.vtt',
-            segments: undefined,
+            segments: [{
+              duration: 6,
+              resolvedUri: 'https://example.com/en.vtt',
+              timeline: 0,
+              uri: 'https://example.com/en.vtt'
+            }],
             timeline: 0,
             uri: ''
           }],
@@ -136,20 +138,25 @@ export const parsedManifest = {
             },
             endList: true,
             resolvedUri: 'https://example.com/es.vtt',
-            segments: undefined,
+            segments: [{
+              duration: 6,
+              resolvedUri: 'https://example.com/es.vtt',
+              timeline: 0,
+              uri: 'https://example.com/es.vtt'
+            }],
             timeline: 0,
             uri: ''
           }],
           uri: ''
         }
       }
     },
-    */
     VIDEO: {}
   },
   playlists: [{
     attributes: {
       AUDIO: 'audio',
+      SUBTITLES: 'subs',
       BANDWIDTH: 449000,
       CODECS: 'avc1.420015',
       NAME: '482',
@@ -194,6 +201,7 @@ export const parsedManifest = {
   }, {
     attributes: {
       AUDIO: 'audio',
+      SUBTITLES: 'subs',
       BANDWIDTH: 3971000,
       CODECS: 'avc1.64001e',
       NAME: '720',

test/toM3u8.test.js

@@ -88,9 +88,6 @@ QUnit.test('playlists', function(assert) {
         }
       },
       ['CLOSED-CAPTIONS']: {},
-      // Subtitles feature is turned off
-      SUBTITLES: {},
-      /*
       SUBTITLES: {
         subs: {
           text: {
@@ -113,12 +110,12 @@ QUnit.test('playlists', function(assert) {
           }
         }
       },
-      */
       VIDEO: {}
     },
     playlists: [{
       attributes: {
         AUDIO: 'audio',
+        SUBTITLES: 'subs',
         BANDWIDTH: 10000,
         CODECS: 'foo;bar',
         NAME: '1',