Add .gitignore to exclude all node packages and lock files

2026-02-23 21:56:04 -05:00
parent faae96c9ed
commit dcc5c6c044
9747 changed files with 1555105 additions and 2 deletions
@@ -0,0 +1,78 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getSamplesFromMoof = void 0;
+const traversal_1 = require("./containers/iso-base-media/traversal");
+const getSamplesFromTraf = (trafSegment, moofOffset, trexBoxes) => {
+    var _a, _b, _c, _d, _e, _f;
+    if (trafSegment.type !== 'regular-box' || trafSegment.boxType !== 'traf') {
+        throw new Error('Expected traf-box');
+    }
+    const tfhdBox = (0, traversal_1.getTfhdBox)(trafSegment);
+    const trexBox = (_a = trexBoxes.find((t) => t.trackId === (tfhdBox === null || tfhdBox === void 0 ? void 0 : tfhdBox.trackId))) !== null && _a !== void 0 ? _a : null;
+    // intentional || instead of ?? to allow for 0, doesn't make sense for duration or size
+    const defaultTrackSampleDuration = (tfhdBox === null || tfhdBox === void 0 ? void 0 : tfhdBox.defaultSampleDuration) || (trexBox === null || trexBox === void 0 ? void 0 : trexBox.defaultSampleDuration) || null;
+    const defaultTrackSampleSize = (tfhdBox === null || tfhdBox === void 0 ? void 0 : tfhdBox.defaultSampleSize) || (trexBox === null || trexBox === void 0 ? void 0 : trexBox.defaultSampleSize) || null;
+    // but flags may just be 0 :)
+    const defaultTrackSampleFlags = (_c = (_b = tfhdBox === null || tfhdBox === void 0 ? void 0 : tfhdBox.defaultSampleFlags) !== null && _b !== void 0 ? _b : trexBox === null || trexBox === void 0 ? void 0 : trexBox.defaultSampleFlags) !== null && _c !== void 0 ? _c : null;
+    const tfdtBox = (0, traversal_1.getTfdtBox)(trafSegment);
+    const trunBoxes = (0, traversal_1.getTrunBoxes)(trafSegment);
+    let time = 0;
+    let offset = 0;
+    let dataOffset = 0;
+    const samples = [];
+    for (const trunBox of trunBoxes) {
+        let i = -1;
+        if (trunBox.dataOffset) {
+            dataOffset = trunBox.dataOffset;
+            offset = 0;
+        }
+        for (const sample of trunBox.samples) {
+            i++;
+            const duration = sample.sampleDuration || defaultTrackSampleDuration;
+            if (duration === null) {
+                throw new Error('Expected duration');
+            }
+            const size = (_d = sample.sampleSize) !== null && _d !== void 0 ? _d : defaultTrackSampleSize;
+            if (size === null) {
+                throw new Error('Expected size');
+            }
+            const isFirstSample = i === 0;
+            const sampleFlags = sample.sampleFlags
+                ? sample.sampleFlags
+                : isFirstSample && trunBox.firstSampleFlags !== null
+                    ? trunBox.firstSampleFlags
+                    : defaultTrackSampleFlags;
+            if (sampleFlags === null) {
+                throw new Error('Expected sample flags');
+            }
+            const keyframe = !((sampleFlags >> 16) & 0x1);
+            const dts = time + ((_e = tfdtBox === null || tfdtBox === void 0 ? void 0 : tfdtBox.baseMediaDecodeTime) !== null && _e !== void 0 ? _e : 0);
+            const samplePosition = {
+                offset: offset + (moofOffset !== null && moofOffset !== void 0 ? moofOffset : 0) + (dataOffset !== null && dataOffset !== void 0 ? dataOffset : 0),
+                decodingTimestamp: dts,
+                timestamp: dts + ((_f = sample.sampleCompositionTimeOffset) !== null && _f !== void 0 ? _f : 0),
+                duration,
+                isKeyframe: keyframe,
+                size,
+                chunk: 0,
+                bigEndian: false,
+                chunkSize: null,
+            };
+            samples.push(samplePosition);
+            offset += size;
+            time += duration;
+        }
+    }
+    return samples;
+};
+const getSamplesFromMoof = ({ moofBox, trackId, trexBoxes, }) => {
+    const mapped = moofBox.trafBoxes.map((traf) => {
+        const tfhdBox = (0, traversal_1.getTfhdBox)(traf);
+        if (!tfhdBox || tfhdBox.trackId !== trackId) {
+            return [];
+        }
+        return getSamplesFromTraf(traf, moofBox.offset, trexBoxes);
+    });
+    return mapped.flat(1);
+};
+exports.getSamplesFromMoof = getSamplesFromMoof;