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

[Xiaohan Wang (王消寒)]

Kindly ping! I'd like to enable related features in Chromium for
experimentation, and a clear signal here would be really helpful. Thanks!

On Tue, Jun 15, 2021 at 2:35 PM Xiaohan Wang (王消寒) <xhwang at chromium.org>
wrote:

> +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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