[Cin] selectable vaapi decoder device

[Phyllis Smith]

Andrew, I ran out of time today but will test the 2 submitted vaapi
patches, although I only have 1 device, just to make sure single device
works as expected still (which I am sure it does, but I like to verify
whatever I can).

On Sat, Aug 26, 2023 at 1:55 AM Andrew Randrianasulu <
randrianasulu at gmail.com> wrote:

> Because I have this  dual-gpu laptop with intel and radeon (r600)
> decoding devices I tried to get second (mesa/r600) device going but
> init failed .. I looked into decoding example:
>
>
> https://gist.github.com/kajott/d1b29c613be30893c855621edd1f212e
>
> and created attached patch
>
> now you can select your specific device with env variable:
>
> CIN_DRM_DEC=/dev/dri/renderD129 DRI_PRIME=1 LIBVA_DRIVER_NAME=r600  bin/cin
>
> in theory same treatment can be applied (with different variable name)
>  to second instance of av_hwdevice_ctx_create (in hw encoder init) but
> I have no device to test it ...
>
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