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[WPE 2.38] Query: Does WPE2.38 support MSE-EME application which uses persistent-license session type? #1546

@hridhya-narayanan-infosys

Description

On WPE 2.38, we observed that load() API fails when the application attempts playback using persistent-license session type. This behaviour was tested using a sample dashjs application, where playback fails during session loading.

Error from wpe logs:

MediaKeys::createSession(BFB0E52D)
MediaKeySession::MediaKeySession(BFB00001) sessionType(2), useDistinctiveIdentifier(false)
MediaKeySession::load(BFB00001) sessionId(ksid98A1E751)
ERROR          webkitthunder CDMThunder.cpp:626:operator(): session  not loaded

From analysis I could see during the initial playback, the CDM session is created via opencdm_construct_session(...) and the license is successfully acquired. However, during subsequent playback the load() API fails because m_session is nullptr and m_sessionID is empty. As a result, the call to opencdm_session_load() fails.

if (!m_session || m_sessionID.isEmpty() || opencdm_session_load(m_session->get()))
    sessionFailure();

widevine-persistent.zip this is the sample app which we have used to test on WPE 2.38. It is configured to use persistent-license session type. The app stores the session ID in the app local storage during first playback and attempts to reload the sessionID on a subsequent playback using MediaKeySession.load(sessionId).

Could you please confirm if any MSE-EME app which uses persistent-license session type is working with WPE 2.38?

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