@svta/common-media-library/dist/drm/fairplay/concatInitDataIdAndCertificate.js

A common library for media playback in JavaScript

import { stringToUint16 } from '../../utils/stringToUint16.js';
/**
 * Concatenates InitData, ID, and Certificate for FairPlay DRM.
 *
 * @param initData - The initialization data (PSSH box)
 * @param id - The content ID (string or Uint16Array)
 * @param cert - The application certificate (Uint8Array)
 * @returns A Uint8Array containing the concatenated data
 *
 * @group DRM
 * @beta
 *
 * @example
 * {@includeCode ../../../test/drm/fairplay/concatInitDataIdAndCertificate.test.ts#example}
 */
export function concatInitDataIdAndCertificate(initData, id, cert) {
    if (typeof id === 'string') {
        id = stringToUint16(id);
    }
    const buffer = new ArrayBuffer(initData.byteLength + 4 + id.byteLength + 4 + cert.byteLength);
    const dataView = new DataView(buffer);
    let offset = 0;
    new Uint8Array(buffer, offset, initData.byteLength).set(initData);
    offset += initData.byteLength;
    dataView.setUint32(offset, id.byteLength, true);
    offset += 4;
    new Uint16Array(buffer, offset, id.length).set(id);
    offset += id.byteLength;
    dataView.setUint32(offset, cert.byteLength, true);
    offset += 4;
    new Uint8Array(buffer, offset, cert.byteLength).set(cert);
    return new Uint8Array(buffer);
}
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