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