# All files / src/demux demuxer.js

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75.61% Branches 31/41
33.33% Functions 1/3
86.59% Lines 71/82

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     import { EventEmitter } from 'eventemitter3';
    import * as work from 'webworkify-webpack';

    import Event from '../events';
    import DemuxerInline from '../demux/demuxer-inline';
    import { logger } from '../utils/logger';
    import { ErrorTypes, ErrorDetails } from '../errors';
    import { getMediaSource } from '../utils/mediasource-helper';
    import { getSelfScope } from '../utils/get-self-scope';

    import { Observer } from '../observer';

    // see https://stackoverflow.com/a/11237259/589493
    const global = getSelfScope(); // safeguard for code that might run both on worker and main thread
    const MediaSource = getMediaSource();

    class Demuxer {
      constructor (hls, id) {
        this.hls = hls;
        this.id = id;

        const observer = this.observer = new Observer();
        const config = hls.config;

        const forwardMessage = (ev, data) => {
          data = data || {};
          data.frag = this.frag;
          data.id = this.id;
          hls.trigger(ev, data);
        };

        // forward events to main thread
        observer.on(Event.FRAG_DECRYPTED, forwardMessage);
        observer.on(Event.FRAG_PARSING_INIT_SEGMENT, forwardMessage);
        observer.on(Event.FRAG_PARSING_DATA, forwardMessage);
        observer.on(Event.FRAG_PARSED, forwardMessage);
        observer.on(Event.ERROR, forwardMessage);
        observer.on(Event.FRAG_PARSING_METADATA, forwardMessage);
        observer.on(Event.FRAG_PARSING_USERDATA, forwardMessage);
        observer.on(Event.INIT_PTS_FOUND, forwardMessage);

        const typeSupported = {
          mp4: MediaSource.isTypeSupported('video/mp4'),
          mpeg: MediaSource.isTypeSupported('audio/mpeg'),
          mp3: MediaSource.isTypeSupported('audio/mp4; codecs="mp3"')
        };
        // navigator.vendor is not always available in Web Worker
        // refer to https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/navigator
        const vendor = navigator.vendor;
        if (config.enableWorker && (typeof (Worker) !== 'undefined')) {
          logger.log('demuxing in webworker');
          let w;
          try {
            w = this.w = work(require.resolve('../demux/demuxer-worker.js'));
            this.onwmsg = this.onWorkerMessage.bind(this);
            w.addEventListener('message', this.onwmsg);
            w.onerror = function (event) {
              hls.trigger(Event.ERROR, { type: ErrorTypes.OTHER_ERROR, details: ErrorDetails.INTERNAL_EXCEPTION, fatal: true, event: 'demuxerWorker', err: { message: event.message + ' (' + event.filename + ':' + event.lineno + ')' } });
            };
            w.postMessage({ cmd: 'init', typeSupported: typeSupported, vendor: vendor, id: id, config: JSON.stringify(config) });
          } catch (err) {
            logger.warn('Error in worker:', err);
            logger.error('Error while initializing DemuxerWorker, fallback on DemuxerInline');
            if (w) {
              // revoke the Object URL that was used to create demuxer worker, so as not to leak it
              global.URL.revokeObjectURL(w.objectURL);
            }
            this.demuxer = new DemuxerInline(observer, typeSupported, config, vendor);
            this.w = undefined;
          }
        } else {
          this.demuxer = new DemuxerInline(observer, typeSupported, config, vendor);
        }
      }

      destroy () {
        let w = this.w;
        if (w) {
          w.removeEventListener('message', this.onwmsg);
          w.terminate();
          this.w = null;
        } else {
          let demuxer = this.demuxer;
          Eif (demuxer) {
            demuxer.destroy();
            this.demuxer = null;
          }
        }
        const observer = this.observer;
        Eif (observer) {
          observer.removeAllListeners();
          this.observer = null;
        }
      }

      push (data, initSegment, audioCodec, videoCodec, frag, duration, accurateTimeOffset, defaultInitPTS) {
        const w = this.w;
        const timeOffset = Number.isFinite(frag.startPTS) ? frag.startPTS : frag.start;
        const decryptdata = frag.decryptdata;
        const lastFrag = this.frag;
        const discontinuity = !(lastFrag && (frag.cc === lastFrag.cc));
        const trackSwitch = !(lastFrag && (frag.level === lastFrag.level));
        const nextSN = lastFrag && (frag.sn === (lastFrag.sn + 1));
        const contiguous = !trackSwitch && nextSN;
        if (discontinuity) {
          logger.log(`${this.id}:discontinuity detected`);
        }

        if (trackSwitch) {
          logger.log(`${this.id}:switch detected`);
        }

        this.frag = frag;
        if (w) {
          // post fragment payload as transferable objects for ArrayBuffer (no copy)
          w.postMessage({ cmd: 'demux', data, decryptdata, initSegment, audioCodec, videoCodec, timeOffset, discontinuity, trackSwitch, contiguous, duration, accurateTimeOffset, defaultInitPTS }, data instanceof ArrayBuffer ? [data] : []);
        } else {
          let demuxer = this.demuxer;
          Eif (demuxer) {
            demuxer.push(data, decryptdata, initSegment, audioCodec, videoCodec, timeOffset, discontinuity, trackSwitch, contiguous, duration, accurateTimeOffset, defaultInitPTS);
          }
        }
      }

      onWorkerMessage (ev) {
        let data = ev.data,
          hls = this.hls;
        switch (data.event) {
        case 'init':
          // revoke the Object URL that was used to create demuxer worker, so as not to leak it
          global.URL.revokeObjectURL(this.w.objectURL);
          break;
          // special case for FRAG_PARSING_DATA: data1 and data2 are transferable objects
        case Event.FRAG_PARSING_DATA:
          data.data.data1 = new Uint8Array(data.data1);
          Eif (data.data2) {
            data.data.data2 = new Uint8Array(data.data2);
          }

          /* falls through */
        default:
          data.data = data.data || {};
          data.data.frag = this.frag;
          data.data.id = this.id;
          hls.trigger(data.event, data.data);
          break;
        }
      }
    }

    export default Demuxer;