@remotion/media-parser/dist/file-types/png.js

A pure JavaScript library for parsing video files

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isPng = void 0;
exports.getPngDimensions = getPngDimensions;
const detect_file_type_1 = require("./detect-file-type");
function getPngDimensions(pngData) {
    if (pngData.length < 24) {
        // PNG header (8) + IHDR chunk (16) minimum
        return null;
    }
    const view = new DataView(pngData.buffer, pngData.byteOffset);
    // Check PNG signature
    const pngSignature = [137, 80, 78, 71, 13, 10, 26, 10];
    for (let i = 0; i < 8; i++) {
        if (pngData[i] !== pngSignature[i]) {
            return null;
        }
    }
    return {
        width: view.getUint32(16, false), // false = big-endian
        height: view.getUint32(20, false), // false = big-endian
    };
}
const isPng = (data) => {
    const pngPattern = new Uint8Array([0x89, 0x50, 0x4e, 0x47]);
    if ((0, detect_file_type_1.matchesPattern)(pngPattern)(data.subarray(0, 4))) {
        const png = getPngDimensions(data);
        return { dimensions: png, type: 'png' };
    }
    return null;
};
exports.isPng = isPng;