[Bug 785531] appsink: forward the Protection Event to the application

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785531

--- Comment #7 from y.bandou <bandou.yacine at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #6)
> Why do you need this information in the application from appsink, and not
> only inside the decryptor element and the application logic connected to it?
> What is your application doing based on the event / message?
> 
> Also Olivier's comment makes sense, the ordering is not preserved here so
> you might receive a message after a new protection event already arrived in
> the appsink. It all depends a bit on what you actually want to do with the
> information.
> 
> He means an API like pull_sample() that works for serialized events instead.

There is my use case in WebKit MSE/EME implementation:

I have two pipelines.

Pipeline1 (AppendPipeline): httpsrc ---> demux ---> appsink    

Pipeline2 (PlaybackPipeline):appsrc --->parser---> decryptor--->decoder--->Sink 

Application (MSE/EME implementation):                

Pipeline1  ---> ( Buffer Manager ) ---> Pipeline2    


When the Demux detects the encrypted content, it sends a Protection Event that
is  propagated until appsink in pipeline1.

So i have two solutions to send the event to the application :

1. Add the current patch.
2. Send a bus message from demux to the application.

What do you suggest ?

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