@svta/common-media-library/dist/drm/cenc/getPsshData.js

A common library for media playback in JavaScript

/**
 * Returns the data portion of a single PSSH box.
 *
 * @param pssh - The PSSH ArrayBuffer.
 * @returns The data portion of the PSSH.
 *
 * @group DRM
 * @beta
 *
 * @example
 * {@includeCode ../../../test/drm/cenc/getPsshData.test.ts#example}
 */
export function getPsshData(pssh) {
    const offset = 8; // Box size and type fields
    const view = new DataView(pssh);
    const version = view.getUint8(offset); // Read version
    let dataOffset = offset + 20;
    if (version > 0) {
        const kidCount = view.getUint32(dataOffset);
        dataOffset += 4 + (16 * kidCount);
    }
    dataOffset += 4; // Data size
    return pssh.slice(dataOffset);
}
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