[Bug 796921] Hardware accelerated {en,de}coder classification and probing support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796921

Olivier Crête <olivier.crete at ocrete.ca> changed:

           What    |Removed                     |Added
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                 CC|                            |olivier.crete at ocrete.ca

--- Comment #1 from Olivier Crête <olivier.crete at ocrete.ca> ---
The idea I had back when I was actively working on Farstream is to do 2 things:

1. Add a "Hardware" string to the klass string in the elementclass, so we can
know which ones are hardware backed

Then the second step has 2 options:

2a. Then you need to make sure that setting the element to READY fails if the
hardware is not present or not available. Then you can just iterate the
registry for elements with Video/Decoder/Hardware (as an example) and set them
to ready one by one..

2b. The other option is to do what v4l2 has been doing and only make the
elements show up if they actually exist and then we can skip the second step
and only have a flag in the element's klass.

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