[Webkit-unassigned] [Bug 185948] [GStreamer] Handle changes in the "drm-preferred-decryption-system-id" NEED_CONTEXT message.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185948

--- Comment #13 from Yacine Bandou <bandou.yacine at gmail.com> ---
> (In reply to Yacine Bandou from comment #8)
> > IMHO, we don't need to use
> > "gst_protection_filter_systems_by_available_decryptors" when we dispatch the
> > GstContext, we simply send all the systemIDs present in the media to the
> > application and let it select any systemID, the application know if this
> > system is supported or not.
> 
> The thing is that maybe in WebKit we know but it might not be the case in
> other apps, I think it makes the API sensibly simpler to use.

This API simply used in order to set the "protection-system" field in padsrc caps of qtdemux.

There are 3 cases : 
1.The application knows the supported systems. 
2.The application doesn't know.
3.The application doesn't respond to the GstContext.

For 1 and 3 there is no problem to dispatch all systemIds, no change. 
For 2 the risk that we can set caps with a default systemID which isn't supported, but in this case the pipeline send an error that no plugin supports these caps and I don't see the problem with this behavior.

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