@remotion/media-parser/dist/containers/riff/parse-idx1.js

A pure JavaScript library for parsing video files

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseIdx1 = void 0;
const AVIIF_KEYFRAME = 0x00000010;
const parseIdx1 = ({ iterator, size, }) => {
    const box = iterator.startBox(size);
    const offset = iterator.counter.getOffset();
    const entries = [];
    const sampleCounts = {};
    let videoTrackIndex = null;
    while (iterator.counter.getOffset() < offset + size) {
        const chunkId = iterator.getByteString(4, false);
        const flags = iterator.getUint32Le();
        const moffset = iterator.getUint32Le();
        const msize = iterator.getUint32Le();
        const chunk = chunkId.match(/^([0-9]{2})(wb|dc)$/);
        const isVideo = chunkId.endsWith('dc');
        if (isVideo) {
            videoTrackIndex = chunk ? parseInt(chunk[1], 10) : null;
        }
        const trackId = chunk ? parseInt(chunk[1], 10) : null;
        if (trackId === null) {
            continue;
        }
        if (!sampleCounts[trackId]) {
            sampleCounts[trackId] = 0;
        }
        const isKeyFrame = (flags & AVIIF_KEYFRAME) !== 0;
        if (isKeyFrame) {
            entries.push({
                flags,
                id: chunkId,
                offset: moffset,
                size: msize,
                sampleCounts: { ...sampleCounts },
            });
        }
        sampleCounts[trackId]++;
    }
    box.expectNoMoreBytes();
    return {
        type: 'idx1-box',
        entries,
        videoTrackIndex,
    };
};
exports.parseIdx1 = parseIdx1;