[Spice-devel] [RFC PATCH 00/16] Add a streaming channel to stream video data from guest to clients.

[Frediano Ziglio]

This series of patches introduce a new DisplayChannel (in the
protocol terminology) and a new guest device implementation which
allows the guest to send streamed data to clients.
This will allow GPU passthrough card to stream data using a new
"stream" guest agent.
This guest agent is required as the host as no control (beside
specific cases) to the guest card.

This implementation has the advantage that it does not require
any client change (during some testing lot of warnings are thrown
by the client but these can be easily removed).

This series require the addition of some protocol declaration
which can be found at
https://cgit.freedesktop.org/~fziglio/spice-protocol/log/?h=stream.

To have a go and try how does it work I wrote a small test
program you can find at
https://cgit.freedesktop.org/~fziglio/stream_send.
It requires currently a stream file encoded as H264 to
be sent.

To add the required device to the VM I add these lines
to libvirt configuration:
    <channel type='spiceport'>
      <source channel='com.redhat.stream.0'/>
      <target type='virtio' name='com.redhat.stream.0'/>
    </channel>
This configuration, beside the device name, is similar to folder sharing
setting (see
https://www.spice-space.org/docs/manual/manual.chunked/ar01s10.html)

Due to some limitation the VM should have another single
QXL device as video device. This as currently the new
DisplayChannel id is fixed as 1.

Any bandwidth control is missing, there are not even any
protocol declaration for this. It's planned that the guest
should informed if it's using too much bandwidth so can
tune it's settings (frame rate/quality) to allows to support
low bandwidth/low latency connection better.

Frediano Ziglio (16):
  OT: small optimization
  OT: style
  char-device: Allows to handle port events from any char device
  stream-device: Add device to handle streaming
  stream-device: Start parsing new protocol from guest - TODO
  stream-channel: Write a really base channel to implement the streaming
  stream-channel: Start implementing DisplayChannel properly
  stream-device: Create channel for stream device
  stream-channel: Implements initialization
  stream-device: Handle streaming data from device to channel
  stream-channel: Allows not fixed size
  stream-channel: Allows to register callback to get new stream request
  stream-channel: Support client connection/disconnection
  stream-channel: Do not show an empty blank screen on start
  char-device: Do not stop and clear interface on reset
  stream-device: Start supporting resetting device when close/open on guest

 server/Makefile.am      |   3 +-
 server/char-device.c    |  31 +-
 server/char-device.h    |  10 +-
 server/red-channel.c    |   3 +-
 server/reds.c           |   8 +-
 server/spicevmc.c       |  10 +-
 server/stream-channel.c | 522 +++++++++++++++++++++++++++++++++++++++++-
 server/stream-channel.h |  69 +++++-
 server/stream-device.c  | 276 ++++++++++++++++++++++-
 9 files changed, 913 insertions(+), 19 deletions(-)
 create mode 100644 server/stream-channel.c
 create mode 100644 server/stream-channel.h
 create mode 100644 server/stream-device.c

base-commit: fe1b819a970d582aaaacbcc4e6702e40305b5eaa
-- 
git-series 0.9.1