As defined by:

https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#open-h-264-encoding

The noVNC HTML application recently added support for this encoding. There is
also an open pull request to add audio support to noVNC:

https://github.com/novnc/noVNC/pull/1952

With that in place, the web based VNC console is good enough to display
a VM showing a video with reasonable bandwidth.

Possible improvements:

- Decide whether we should allow --gst-* arguments on the command line
- Dynamic switching to/from H264 mode at high change rates

We may also extend the RFB Audio protocol with "opus" encoding, because uncompressed
audio need too much bandwidth.

Changes in v4:

- style fixes and cleanup (as suggested by Marc and Daniel)
- use SPDX-License-Identifier for new file
- protect everything with #ifdef CONFIG_GSTREAMER
- simplify vnc_refresh as suggested by Daniel (avoid populating
  the rectangle array, do not use vs after it might be freed)
- make "h264" a boolean option
- add new "h264-encoders" options (colon separated)
- add a cleanup path for vnc instead of using shutdown notifiers.


Changes in v3:

- add license header
- sqash patch to remove libavcodec prefix
- use gst_clear_object and goto error
- use single g_object_set
- g_autoptr/g_new0
- document vnc_h264_send_framebuffer_update returnm value
- avoid mixed declarations
- use loop to retrieve samples
- initialize gst during argument processing
- add hardware encoders


Changes in v2:

- cleanup: h264: remove wrong libavcodec_ prefix from function names
- search for available h264 encoder, and only enable h264 if a
  encoder is available
- new vnc option to configure h264 at server side


Dietmar Maurer (8):
  new configure option to enable gstreamer
  vnc: initialize gst during argument processing
  add vnc h264 encoder
  vnc: h264: send additional frames after the display is clean
  h264: search for available h264 encoder
  h264: new vnc options to configure h264 at server side
  h264: add hardware encoders
  h264: stop gstreamer pipeline before destroying, cleanup on exit

 include/ui/console.h          |   1 +
 meson.build                   |  10 +
 meson_options.txt             |   2 +
 scripts/meson-buildoptions.sh |   3 +
 system/runstate.c             |   2 +
 system/vl.c                   |   8 +
 ui/meson.build                |   1 +
 ui/vnc-enc-h264.c             | 358 ++++++++++++++++++++++++++++++++++
 ui/vnc-jobs.c                 |  53 +++--
 ui/vnc.c                      |  80 +++++++-
 ui/vnc.h                      |  29 +++
 11 files changed, 529 insertions(+), 18 deletions(-)
 create mode 100644 ui/vnc-enc-h264.c

-- 
2.39.5