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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | 28x 28x 28x | /*
* id3 metadata track controller
*/
import Event from '../events';
import EventHandler from '../event-handler';
import ID3 from '../demux/id3';
import { sendAddTrackEvent, clearCurrentCues } from '../utils/texttrack-utils';
class ID3TrackController extends EventHandler {
constructor (hls) {
super(hls,
Event.MEDIA_ATTACHED,
Event.MEDIA_DETACHING,
Event.FRAG_PARSING_METADATA);
this.id3Track = undefined;
this.media = undefined;
}
destroy () {
EventHandler.prototype.destroy.call(this);
}
// Add ID3 metatadata text track.
onMediaAttached (data) {
this.media = data.media;
if (!this.media) {
}
}
onMediaDetaching () {
clearCurrentCues(this.id3Track);
this.id3Track = undefined;
this.media = undefined;
}
getID3Track (textTracks) {
for (let i = 0; i < textTracks.length; i++) {
let textTrack = textTracks[i];
if (textTrack.kind === 'metadata' && textTrack.label === 'id3') {
// send 'addtrack' when reusing the textTrack for metadata,
// same as what we do for captions
sendAddTrackEvent(textTrack, this.media);
return textTrack;
}
}
return this.media.addTextTrack('metadata', 'id3');
}
onFragParsingMetadata (data) {
const fragment = data.frag;
const samples = data.samples;
// create track dynamically
if (!this.id3Track) {
this.id3Track = this.getID3Track(this.media.textTracks);
this.id3Track.mode = 'hidden';
}
// Attempt to recreate Safari functionality by creating
// WebKitDataCue objects when available and store the decoded
// ID3 data in the value property of the cue
let Cue = window.WebKitDataCue || window.VTTCue || window.TextTrackCue;
for (let i = 0; i < samples.length; i++) {
const frames = ID3.getID3Frames(samples[i].data);
if (frames) {
const startTime = samples[i].pts;
let endTime = i < samples.length - 1 ? samples[i + 1].pts : fragment.endPTS;
// Give a slight bump to the endTime if it's equal to startTime to avoid a SyntaxError in IE
if (startTime === endTime)
endTime += 0.0001;
for (let j = 0; j < frames.length; j++) {
const frame = frames[j];
// Safari doesn't put the timestamp frame in the TextTrack
if (!ID3.isTimeStampFrame(frame)) {
const cue = new Cue(startTime, endTime, '');
cue.value = frame;
this.id3Track.addCue(cue);
}
}
}
}
}
}
export default ID3TrackController;
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