driver out of it.
Exactly. v4l is basically just an analog video capture API.
It would be nice to have a v4l compatible interface to the radeon
capture interface for AIW and VIVO cards; this would require the drm
as well. That's another potential user.
The radeon v4l driver "km" is now maintained and developed by Antti Ajanki.
The cooperation of drm is needed for acknowledging interrupts, otherwise
they are pretty much orthogonal - km uses RADEON_GUI_DMA registers for
transfers from video memory to system ram.
best
Vladimir Dergachev
Alex
XvMC is very similar to OpenGL in it's use of the hardware. It uses the
same DMA command engine and it renders directly to the frame buffer,
either to an offscreen area which is then communicated to the video
engines, or directly to the visible frame-buffer and hence needs the DRI
drawable management. There is very little logical difference between
"render this texture" or "render this macroblock". Besides, if V4L needs
to use the same DMA command engine it still would need to talk to DRM.
Still, this isn't really the point. I'd like to see drm available for
other applications than OpenGL in the future. If drmAddMap goes away, I
can live with that, but I'd probably would have to implement a
device-specific non-root "Hi, I'm the master, get me a handle to clean
sarea that other clients can map" IOCTL when it's needed, and, as I see
it, that wouldn't interfer with your work.
/Thomas
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