So basically, when a license request fails (eg. network Error, server
down whatever), apps can now retry from scratch by calling
`player.retryLicensing()`. This was tricky to implement because of EME
spec limitations: `generateRequest()` can only be called once per
session. So if it fails, it would be stuck.
So I close the old session and create a brand new one with the same
`initData`
> Will Video element throw an error during this process?
we were worried that closing the session would leave the video without
keys for a brief moment, potentially triggering errors. But in practice,
the transition is fast enough( I added a 0.1s delay for CDM clean up)
and the video element handles it gracefully
> Will new encrypted event fire? If not, will it limit this feature?
The encrypted event only fires when the browser first encounters
encrypted content. When we close and recreate a session, the content is
already loaded, so no new event
Solutions: In `CreateSession()` metadata store `initData` and
`initDataType` in the session metadata when the session is first
created. So when `retryLicensing()`is called, we just grab the stored
data and pass it to `generateRequest()` on the new session. No need to
wait for an `encrypted` event at all.
---------
Co-authored-by: Álvaro Velad Galván <ladvan91@hotmail.com>
Co-authored-by: Wojciech Tyczyński <tykus160@gmail.com>
Álvaro Velad Galván
Andy(김규회)