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dashboard-ui/bower_components/hls.js/src/demux/demuxer-worker.js

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+/* demuxer web worker.
+ *  - listen to worker message, and trigger DemuxerInline upon reception of Fragments.
+ *  - provides MP4 Boxes back to main thread using [transferable objects](https://developers.google.com/web/updates/2011/12/Transferable-Objects-Lightning-Fast) in order to minimize message passing overhead.
+ */
+
+ import DemuxerInline from '../demux/demuxer-inline';
+ import Event from '../events';
+ import EventEmitter from 'events';
+ import MP4Remuxer from '../remux/mp4-remuxer';
+
+var DemuxerWorker = function (self) {
+  // observer setup
+  var observer = new EventEmitter();
+  observer.trigger = function trigger (event, ...data) {
+    observer.emit(event, event, ...data);
+  };
+
+  observer.off = function off (event, ...data) {
+    observer.removeListener(event, ...data);
+  };
+  self.addEventListener('message', function (ev) {
+    //console.log('demuxer cmd:' + ev.data.cmd);
+    switch (ev.data.cmd) {
+      case 'init':
+        self.demuxer = new DemuxerInline(observer,MP4Remuxer);
+        break;
+      case 'demux':
+        var data = ev.data;
+        self.demuxer.push(new Uint8Array(data.data), data.audioCodec, data.videoCodec, data.timeOffset, data.cc, data.level, data.sn, data.duration);
+        break;
+      default:
+        break;
+    }
+  });
+
+  // listen to events triggered by TS Demuxer
+  observer.on(Event.FRAG_PARSING_INIT_SEGMENT, function(ev, data) {
+    var objData = {event: ev};
+    var objTransferable = [];
+    if (data.audioCodec) {
+      objData.audioCodec = data.audioCodec;
+      objData.audioMoov = data.audioMoov.buffer;
+      objData.audioChannelCount = data.audioChannelCount;
+      objTransferable.push(objData.audioMoov);
+    }
+    if (data.videoCodec) {
+      objData.videoCodec = data.videoCodec;
+      objData.videoMoov = data.videoMoov.buffer;
+      objData.videoWidth = data.videoWidth;
+      objData.videoHeight = data.videoHeight;
+      objTransferable.push(objData.videoMoov);
+    }
+    // pass moov as transferable object (no copy)
+    self.postMessage(objData,objTransferable);
+  });
+
+  observer.on(Event.FRAG_PARSING_DATA, function(ev, data) {
+    var objData = {event: ev, type: data.type, startPTS: data.startPTS, endPTS: data.endPTS, startDTS: data.startDTS, endDTS: data.endDTS, moof: data.moof.buffer, mdat: data.mdat.buffer, nb: data.nb};
+    // pass moof/mdat data as transferable object (no copy)
+    self.postMessage(objData, [objData.moof, objData.mdat]);
+  });
+
+  observer.on(Event.FRAG_PARSED, function(event) {
+    self.postMessage({event: event});
+  });
+
+  observer.on(Event.ERROR, function(event, data) {
+    self.postMessage({event: event, data: data});
+  });
+
+  observer.on(Event.FRAG_PARSING_METADATA, function(event, data) {
+    var objData = {event: event, samples: data.samples};
+    self.postMessage(objData);
+  });
+};
+
+export default DemuxerWorker;
+