[Libva] How to implement a EGL or DRM display in VA-API driver

[Xiang, Haihao]

On Wed, 2016-11-02 at 19:32 +0800, Randy Li wrote:
> 
> On 10/29/2016 04:09 AM, Sean V Kelley wrote:
> > 
> > On Fri, 2016-10-28 at 10:05 +0800, Randy Li wrote:
> > > 
> > > On 10/27/2016 11:03 PM, Xiang, Haihao wrote:
> > > > > -----Original Message-----
> > > > > From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.o
> > > > > rg]
> > > > > On Behalf
> > > > > Of Randy Li
> > > > > Sent: Monday, October 24, 2016 3:59 PM
> > > > > To: libva at lists.freedesktop.org
> > > > > Cc: gwenole.beauchesne at intel.com; dri-devel at lists.freedesktop
> > > > > .org
> > > > > ; linux-
> > > > > rockchip at lists.infradead.org; Jaquez, VictorX <victorx.jaquez
> > > > > @int
> > > > > el.com>;
> > > > > eddie.cai <eddie.cai at rock-chips.com>; 林金发 <alpha.lin at rock-chi
> > > > > ps.c
> > > > > om>;
> > > > > herman.chen at rock-chips.com; vjaquez at igalia.com
> > > > > Subject: How to implement a EGL or DRM display in VA-API
> > > > > driver
> > > > > 
> > > > > Hello:
> > > > >   I am going to implement a EGL and DRM display for Rockchip
> > > > > VA-
> > > > > API driver.
> > > > > We do have a EGL implementation in Rockchip VA-API driver,
> > > > > but it
> > > > > is
> > > > > implemented in the standard way, we did that as a X11
> > > > > display.
> > > > >   I didn't see the usage of struct VADriverVTableEGL in
> > > > > gstreamer, and I have
> > > > > no idea about where should I implement something functions
> > > > > like
> > > > > eglExportDRMImageMESA().
> > > > 
> > > > VADriverVTableEGL is deprecated in libva, we has a more
> > > > efficient
> > > > way to use vaapi and egl.
> > > > You can refer to the examples in libyami-utils (https://github.
> > > > com/
> > > > 01org/libyami-utils.git) for
> > > > how to use vaapi and egl.
> > > 
> > > I see, thank you.
> I looks like the currently VA-API only need vaDeriveImage() and 
> vaAcquireBufferHandle(), leaving the rendering output buffer to
> display 
> to VA-API client. vaapisink from gstreamer would play no role in
> this?
> > > > 
> > > > >   The DRM seems more complex, the reason I want to use the
> > > > > DRM is
> > > > > that,
> > > > > GPU would not work with the 4K video rendering, so the DRM
> > > > > means
> > > > > that
> The guys from algorithm department told me that the main problem is 
> VA-API can't process video parallelly and it won't process the next 
> frame until vaEndPicture() and a output function(like
> vaDeriveImage(),
> vaGetImage and vaPutSurface()).


What do you mean when you said 'VA-API' can't  process video parallelly
? The examples/grid.cpp can processes multiple videoes  parallelly.

> > > > > directly output the video into video controller in our
> > > > > platform.
> > > > > But still have no
> > > > > idea what kind of thing I should implement in the VA-API
> > > > > driver.
> > > > > It seems that
> > > > > the VA-API base library would open a DRM instance for the
> > > > > driver,
> > > > > but leaving
> > > > > those configure for connector, encoder, planes to VA-API
> > > > > driver?
> > > 
> > > About the DRM, I have implemented a version which pretends a X
> > > output, I
> > > would like to know a better way.
> > 
> > Connector properties and their configuration are entirely display
> > port
> > oriented.  "Pretending an X output" is independent of KMS
> > configuration
> > for your display port.
> No, what I do is pretended as a VA_DISPLAY_X11 display. I have read
> the
> examples/grid.cpp from libyami-utils. It seems that those job have
> been 
> moved into VA-API client. The whole display system looks like
> departured.
> So the element plugin vaapisink from gstreamer would be drop in the 
> future? As those job have been done by kmssink and glimagesink.
> > 
> > Sean
> > 
> > > > 
> > > > configure for connector, encoder, planes aren't a part of va-
> > > > api
> > > > driver.  You should check libdrm and drm/i915.
> > > > You can refer to the test case of modetest in libdrm
> > > > (git.freedesktop.org/git/mesa/drm)
> > > > 
> > > > 
> > > > >   Could you guys give me same sample code or example of those
> > > > > kind of
> > > > > display in VA-API or the documents would help(I would not
> > > > > image
> > > > > there is a
> > > > > VA-API documents)
> > > > > 
> > > > > --
> > > > > Randy Li
> > > > > The third produce department
> > > > > 
> > > > > _______________________________________________
> > > > > dri-devel mailing list
> > > > > dri-devel at lists.freedesktop.org
> > > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > > > 
> > > > _______________________________________________
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> > > > 
> > > 
> > > 
>