@svta/common-media-library/dist/iso/bmff/readers/readInt.js

A common library for media playback in JavaScript

export function readInt(dataView, offset, size) {
    let result = NaN;
    const cursor = offset - dataView.byteOffset;
    switch (size) {
        case 1:
            result = dataView.getInt8(cursor);
            break;
        case 2:
            result = dataView.getInt16(cursor);
            break;
        case 4:
            result = dataView.getInt32(cursor);
            break;
        case 8:
            // Warning: JavaScript cannot handle 64-bit integers natively.
            // This will give unexpected results for integers >= 2^53
            const s1 = dataView.getInt32(cursor);
            const s2 = dataView.getInt32(cursor + 4);
            result = (s1 * Math.pow(2, 32)) + s2;
            break;
    }
    return result;
}
;
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