[vlc-devel] [PATCH v4] linux: kernel mode setting (KMS) vout plugin

Thomas Guillem thomas at gllm.fr
Mon Jul 2 09:17:20 CEST 2018


Hello,

I pushed your patch after modifying the following:

 - Removed drmSetMaster code block
 - Remove N_() translations since this plugin is for advanced users  (and avoid to lose translators with technical terms).
 - Added your module to MODULES_LIST

On Sat, Jun 30, 2018, at 19:47, Juha-Pekka Heikkil├Ą wrote:
> 
> 
> Thomas Guillem kirjoitti 29.6.2018 klo 16.12:
> > 
> > 
> > On Thu, Jun 28, 2018, at 14:33, Juha-Pekka Heikkila wrote:
> >> On 26.06.2018 16:08, Thomas Guillem wrote:
> >>> Hello,
> >>>
> >>> This plugin is well written. This is a very good start for DRM support into VLC. Personally, I would love to have OpenGL support with DRM, by using our OpenGL vout with a DRM window plugin and the EGL DRM extension.
> >>>
> >>
> >> I was earlier talking with Remi about this, I see this kind of change as
> >> 'v3' of this plugin..as in v1 is this bare bones working on with the
> >> basics. If there are special nuances found in some platform which I
> >> don't have access it will be easier to hunt down and fix problems. V2 is
> >> where mix in DRM features which can make a difference. At least with
> >> scaling done on display HW can be made gains on power usage as well as
> >> performance and its all totally free. V3 would be where add features
> >> which start to change things. Though, I still don't know what is the
> >> benefit of having OpenGL here? Remi tried to explain it to me but I
> >> understood from him the gain is limited because DRM is full screen only.
> > 
> > We prefer having a GL, D3D (or VK soon) based vout in order to apply GPU filters, like the one used to render 360┬░ videos for example.
> > A vout without shaders won't be capable to render such videos in a good way.
> > 
> >>
> >>> I was able to test it and have one remarks:
> >>>
> >>> Why do you set the DRM master mode (drmSetMaster()) ?
> >>> It forces to run VLC as root. I tried to remove this part and was able to run your plugin as a normal user (with video group perm).
> >>>
> >>> Maybe you should not fail if drmSetMaster fails ?
> >>>
> >>
> >> I had chitty chatty with my friend who know how DRM rights management
> >> work and it turn out I can just drop the request for becoming drm
> >> master, these rights are given automatically for my process or otherwise
> >> I get error on one of my drm requests. This will also drop need for
> >> root. I still need to try on how it work out in reality.
> > 
> > So, I can remove this master part and push ? Agree ?
> > 
> 
> Agree. Let me know after you've pushed.
> 
> /Juha-Pekka


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