RE: [EME] Spec now uses promises

Hi David;

I’ve been pondering have promise return null on an existing session.  This conveys that no new session was needed, and limits any subsequent handling.  Did you consider returning the current session instead?

Jerry

From: David Dorwin [mailto:ddorwin@google.com]
Sent: Monday, April 14, 2014 3:53 PM
To: public-html-media@w3.org
Subject: [EME] Spec now uses promises

I just committed a large changeset<https://dvcs.w3.org/hg/html-media/rev/9842af174b80> that implements promises per bug 25199<http://bug%2025199>.

The examples<https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#examples> are also updated*, and that is possibly the most interesting change. MediaKeys and MediaKeySession creation is more complex, especially when supporting more than one session in response to needkey events  as in example 8.2<https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#examples-selecting-key-system>. Since there may not be a MediaKeys object, initData must be queued. Also, we need an additional variable to determine whether there is a pending MediaKeys creation because video.mediaKeys is asynchronously set sometime after MediaKeys.create() asynchronously completes.

There will be more changes soon as I resolve bugs that were dependent on promises.

David

* Please let me know if there are errors or better solutions.