Tracking de l'application VApp (IHM du jeu)

VApp/node_modules/mux.js/es/mp4/webvtt-parser.js

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+var _require = require("../tools/mp4-inspector"),
+    parseTfdt = _require.parseTfdt;
+
+var findBox = require("./find-box");
+
+var _require2 = require("./probe"),
+    getTimescaleFromMediaHeader = _require2.getTimescaleFromMediaHeader;
+
+var _require3 = require("./samples"),
+    parseSamples = _require3.parseSamples,
+    getMdatTrafPairs = _require3.getMdatTrafPairs;
+/**
+ * Module for parsing WebVTT text and styles from FMP4 segments.
+ * Based on the ISO/IEC 14496-30.
+ */
+
+
+var WebVttParser = function WebVttParser() {
+  // default timescale to 90k
+  var timescale = 90e3;
+  /**
+   * Parses the timescale from the init segment.
+   * @param {Array<Uint8Array>} segment The initialization segment to parse the timescale from.
+   */
+
+  this.init = function (segment) {
+    // We just need the timescale from the init segment.
+    var mdhd = findBox(segment, ['moov', 'trak', 'mdia', 'mdhd'])[0];
+
+    if (mdhd) {
+      timescale = getTimescaleFromMediaHeader(mdhd);
+    }
+  };
+  /**
+   * Parses a WebVTT FMP4 segment.
+   * @param {Array<Uint8Array>} segment The content segment to parse the WebVTT cues from.
+   * @returns The WebVTT cue text, styling, and timing info as an array of cue objects.
+   */
+
+
+  this.parseSegment = function (segment) {
+    var vttCues = [];
+    var mdatTrafPairs = getMdatTrafPairs(segment);
+    var baseMediaDecodeTime = 0;
+    mdatTrafPairs.forEach(function (pair) {
+      var mdatBox = pair.mdat;
+      var trafBox = pair.traf; // zero or one.
+
+      var tfdtBox = findBox(trafBox, ['tfdt'])[0]; // zero or one.
+
+      var tfhdBox = findBox(trafBox, ['tfhd'])[0]; // zero or more.
+
+      var trunBoxes = findBox(trafBox, ['trun']);
+
+      if (tfdtBox) {
+        var tfdt = parseTfdt(tfdtBox);
+        baseMediaDecodeTime = tfdt.baseMediaDecodeTime;
+      }
+
+      if (trunBoxes.length && tfhdBox) {
+        var samples = parseSamples(trunBoxes, baseMediaDecodeTime, tfhdBox);
+        var mdatOffset = 0;
+        samples.forEach(function (sample) {
+          // decode utf8 payload
+          var UTF_8 = 'utf-8';
+          var textDecoder = new TextDecoder(UTF_8); // extract sample data from the mdat box.
+          // WebVTT Sample format:
+          // Exactly one VTTEmptyCueBox box
+          // OR one or more VTTCueBox boxes.
+
+          var sampleData = mdatBox.slice(mdatOffset, mdatOffset + sample.size); // single vtte box.
+
+          var vtteBox = findBox(sampleData, ['vtte'])[0]; // empty box
+
+          if (vtteBox) {
+            mdatOffset += sample.size;
+            return;
+          } // TODO: Support 'vtta' boxes.
+          // VTTAdditionalTextBoxes can be interleaved between VTTCueBoxes.
+
+
+          var vttcBoxes = findBox(sampleData, ['vttc']);
+          vttcBoxes.forEach(function (vttcBox) {
+            // mandatory payload box.
+            var paylBox = findBox(vttcBox, ['payl'])[0]; // optional settings box
+
+            var sttgBox = findBox(vttcBox, ['sttg'])[0];
+            var start = sample.pts / timescale;
+            var end = (sample.pts + sample.duration) / timescale;
+            var cueText, settings; // contains cue text.
+
+            if (paylBox) {
+              try {
+                cueText = textDecoder.decode(paylBox);
+              } catch (e) {
+                console.error(e);
+              }
+            } // settings box contains styling.
+
+
+            if (sttgBox) {
+              try {
+                settings = textDecoder.decode(sttgBox);
+              } catch (e) {
+                console.error(e);
+              }
+            }
+
+            if (sample.duration && cueText) {
+              vttCues.push({
+                cueText: cueText,
+                start: start,
+                end: end,
+                settings: settings
+              });
+            }
+          });
+          mdatOffset += sample.size;
+        });
+      }
+    });
+    return vttCues;
+  };
+};
+
+module.exports = WebVttParser;