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 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 9x 9x 9x 9x 9x 9x 9x 3x 2x 2x 1x 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1x 2x 1x 2x 2x 1x 1x 1x 1x 6x 6x 6x 4x 4x 1x 1x 1x 2x 2x 2x 2x 2x | import EventEmitter from 'events'; import 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'; // 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; // 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 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; } } 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 = Number.isFinite(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 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; |