This patch series adds options to select a preferred codec and also
to forward a dmabuf directly to the encoder module that is part of
the Spice server. Currently, gstreamer:h264 is the only combination
tested but additional work is ongoing to test other combinations. 

Tested with: -device virtio-gpu-pci,max_outputs=1,blob=true,xres=1920,yres=1080
             -spice port=3001,gl=on,disable-ticketing=on,dmabuf-encode=on,
              preferred-codec=gstreamer:h264

and remote-viewer --spice-debug spice://x.x.x.x:3001 on the client side.

Associated Spice server patches (v1) can be found here:
https://lists.freedesktop.org/archives/spice-devel/2023-January/052927.html

v2:
- Used the already available gl_scanout and gl_draw_async APIs instead
  of adding new ones to Spice.
- Improved the commit message of the second patch

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>

Vivek Kasireddy (2):
  spice: Add an option for users to provide a preferred codec
  spice: Add an option to forward the dmabuf directly to the encoder
    (v2)

 include/ui/spice-display.h |  1 +
 qemu-options.hx            | 11 +++++-
 ui/spice-core.c            | 36 ++++++++++++++++--
 ui/spice-display.c         | 75 ++++++++++++++++++++++++++++----------
 4 files changed, 100 insertions(+), 23 deletions(-)

-- 
2.37.2