[webkit-dev] Request for position: EME MediaKeySession Closed Reason

[Xiaohan Wang (王消寒)]

+Jer

Kindly ping! Thanks!



On Tue, Jun 8, 2021 at 11:36 AM Xiaohan Wang (王消寒) <xhwang at chromium.org>
wrote:

> This is a request for WebKit's position on the "EME MediaKeySession Closed
> Reason" proposal:
>
> *Links*
>
>    - W3C EME spec issue/explainer:
>    https://github.com/w3c/encrypted-media/issues/473
>    - W3C EME spec Pull Request:
>    https://github.com/w3c/encrypted-media/pull/487
>    - Previous Media Working Group meeting discussion on this topic
>    (with Jer Noble):
>    https://lists.w3.org/Archives/Public/public-media-wg/2020Sep/0004.html
>
> Summary
>
> A MediaKeySessionClosedReason is proposed to indicate the reason for EME
> MediaKeySession closure, and the `closed` attribute would return a
> `Promise<MediaKeySessionClosedReason>` instead of the current
> `Promise<void>`.
>
> Motivation
>
> The current EME spec says "the CDM may close a session at any point, such
> as when the session is no longer needed or when system resources are lost".
> However, there's no way to specify the exact reason for session closure. In
> some cases, this is part of normal user flow, e.g. user close laptop lid to
> put the device into sleep mode, where the player should resume playback. In
> some other cases, this is due to some unrecoverable fatal error.
>
> This proposal updates the `closed` attribute on MediaKeySession to provide
> a MediaKeySessionClosedReason so that the JavaScript player can handle
> session closure differently based on the reasons.
>
> *Contact email*
> xhwang at chromium.org
>
> Looking forward to your feedback!
>
> Best,
> Xiaohan
>
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