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import DemuxerInline from '../demux/demuxer-inline';
import { logger } from '../utils/logger';
import { ErrorTypes, ErrorDetails } from '../errors';
import EventEmitter from 'events';
import work from 'webworkify-webpack';
import { getMediaSource } from '../helper/mediasource-helper';
const MediaSource = getMediaSource();
class Demuxer {
constructor (hls, id) {
this.hls = hls;
this.id = id;
// observer setup
const observer = this.observer = new EventEmitter();
const config = hls.config;
observer.trigger = function trigger (event, ...data) {
observer.emit(event, event, ...data);
};
observer.off = function off (event, ...data) {
observer.removeListener(event, ...data);
};
let forwardMessage = function (ev, data) {
data = data || {};
data.frag = this.frag;
data.id = this.id;
hls.trigger(ev, data);
}.bind(this);
// 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.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
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;
}
}
let 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 = !isNaN(frag.startDTS) ? frag.startDTS : 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
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;
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