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Parse keyid from multi-key widevine PSSH #7415

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Merged
robwalch merged 2 commits into from
Aug 28, 2025
Merged

Parse keyid from multi-key widevine PSSH #7415

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cf64508
fix: parsing keyId for widevine drm
yajin2021 Jul 19, 2025
4ddcbf2
fix: code review.
yajin2021 Jul 21, 2025
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11 changes: 9 additions & 2 deletions src/loader/level-key.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ import { hexToArrayBuffer } from '../utils/hex';
import { convertDataUriToArrayBytes } from '../utils/keysystem-util';
import { logger } from '../utils/logger';
import { KeySystemFormats, parsePlayReadyWRM } from '../utils/mediakeys-helper';
import { mp4pssh } from '../utils/mp4-tools';
import { mp4pssh, parseMultiPssh } from '../utils/mp4-tools';

let keyUriToKeyIdMap: { [uri: string]: Uint8Array<ArrayBuffer> } = {};

Expand Down Expand Up @@ -142,7 +142,14 @@ export class LevelKey implements DecryptData {
// the playlist-key before the "encrypted" event. (Comment out to only use "encrypted" path.)
this.pssh = keyBytes;
// In case of Widevine, if KEYID is not in the playlist, assume only two fields in the pssh KEY tag URI.
if (!this.keyId && keyBytes.length >= 22) {
if (!this.keyId) {
const [psshData] = parseMultiPssh(keyBytes.buffer);
this.keyId =
psshData && 'kids' in psshData && psshData.kids?.[0]
? psshData.kids[0]
: null;
}
if (!this.keyId) {
const offset = keyBytes.length - 22;
this.keyId = keyBytes.subarray(offset, offset + 16);
}
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