@svta/common-media-library/dist/drm/playready/toBigEndianKeyId.js

A common library for media playback in JavaScript

/**
 * Converts a 16-byte key ID from little-endian to big-endian format.
 *
 * @param keyId - The little-endian key ID to convert.
 * @returns The big-endian representation of the key ID.
 *
 * @group DRM
 * @beta
 *
 * @example
 * {@includeCode ../../../test/drm/playready/toBigEndianKeyId.test.ts#example}
 */
export function toBigEndianKeyId(keyId) {
    if (keyId.byteLength !== 16) {
        return keyId;
    }
    const buffer = keyId.slice(0);
    const dataView = new DataView(buffer);
    dataView.setUint32(0, dataView.getUint32(0, true), false);
    dataView.setUint16(4, dataView.getUint16(4, true), false);
    dataView.setUint16(6, dataView.getUint16(6, true), false);
    return buffer;
}
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