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Implement HTML5 video subtitles

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hensm
2018-12-21 23:08:37 +00:00
parent 84475ce319
commit 45b976b304
1 changed files with 58 additions and 0 deletions
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58
ext/src/mediaCast.js
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@@ -126,8 +126,66 @@ async function onRequestSessionSuccess (session_) {
];
}
const activeTrackIds = [];
if (mediaElement.textTracks.length) {
const trackElements = mediaElement.querySelectorAll("track");
let index = 0;
for (const textTrack of mediaElement.textTracks) {
const trackElement = trackElements[index];
// Create Track object
const track = new chrome.cast.media.Track(
index // trackId
, chrome.cast.media.TrackType.TEXT); // trackType
// Copy TextTrack properties to Track
track.name = textTrack.label;
track.language = textTrack.language;
track.trackContentId = trackElement.src;
track.trackContentType = "text/vtt";
const { TextTrackType } = chrome.cast.media;
switch (textTrack.kind) {
case "subtitles":
track.subtype = TextTrackType.SUBTITLES;
break;
case "captions":
track.subtype = TextTrackType.CAPTIONS;
break;
case "descriptions":
track.subtype = TextTrackType.DESCRIPTIONS;
break;
case "chapters":
track.subtype = TextTrackType.CHAPTERS;
break;
case "metadata":
track.subtype = TextTrackType.METADATA;
break;
// Default to subtitles
default:
track.subtype = TextTrackType.SUBTITLES;
}
// Add track to mediaInfo
mediaInfo.tracks.push(track);
// If enabled, set as active track for load request
if (textTrack.mode === "showing" || trackElement.default) {
activeTrackIds.push(index);
}
index++;
}
}
const loadRequest = new chrome.cast.media.LoadRequest(mediaInfo);
loadRequest.autoplay = false;
loadRequest.activeTrackIds = activeTrackIds;
session.loadMedia(loadRequest
, onLoadMediaSuccess