# All files / src/controller id3-track-controller.js

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     /*
     * 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;