[Spice-devel] not clear how to use streaming agent

[孙得霖]

Hello, 
Thanks for your response, you are right,I am using Intel vGPU and running a Windows7 guest. So I am not clear how to using streaming-agent in Window 7 guest. Next I will try linux as the guest.


Intel provides a dma-buf of the host at 30ms intervals(the dma-buf is full-screen size), spice-server's commands tree is used for video stream detection. My idea is capture guest video stream(use plugin) and send to client direct, do not use spice-server's commands tree for video stream detection.At present, it is in the pre-research stage.



BR.
 
 
------------------ Original ------------------
From:  "Uri Lublin"<uril at redhat.com>;
Date:  Mon, Apr 16, 2018 07:45 PM
To:  "孙得霖"<kong.delin at embedway.com>; "spice-devel"<spice-devel at lists.freedesktop.org>; 

Subject:  Re: [Spice-devel] not clear how to use streaming agent

 
On 04/12/2018 05:37 AM, 孙得霖 wrote:
> hi,
>      I use spice for remote view, I want to captures the guest video 
> output, encodes it and send through, so I choose streaming agent, how to 
> build and run it is not clear, can you help me?
> 
> 1.host environment and Software version:
> centOS(Mini install)
> GVT-g kernel:      https://github.com/intel/gvt-linux/  (branch: 
> topic/dmabuf)
> QEMU:              https://github.com/intel/igvtg-qemu  (branch: qa/dma_buf)
> streming agent:    https://gitlab.com/spice/spice-streaming-agent
> spice-server       version:0.13.3
> spice-protocol     version:0.12.12
> 
> 2.build info
> kernel:
> make -j 8
> make modules_install && make install
> reboot
> 
> qemu:
> ./configure --prefix=/usr --enable-kvm --disable-xen --enable-debug-info 
> --enable-debug --enable-sdl --enable-vhost-net --enable-spice 
> --disable-debug-tcg --enable-numa --enable-libusb --enable-curl 
> --enable-usb-redir --enable-linux-aio --target-list=x86_64-softmmu 
> --enable-gtk --with-gtkabi=3.0
> make -j 8
> cd roms/seabios
> make -j 8
> cd -
> make install
> cp roms/seabios/out/bios.bin /usr/bin/bios.bin
> 
> spice-protocol:
> ./configure --prefix=/usr
> make -j 8
> make install
> 
> spice-service:
> ./configure  --prefix=/usr --enable-manual=no --disable-silent-rules 
> --disable-smartcard --disable-celt051 --enable-client CFLAGS="-g -O0" 
> CXXFLAGS="-g -O0"
> make -j 8
> make install
> 
> streming agent
> ./autogen.sh
> make -j 8
> make install
> 
> 3.run qemu
> /usr/bin/qemu-system-x86_64 \
> -m 8192 \
> -smp 4,sockets=1,cores=4,threads=1 \
> -M pc \
> -name win71 \
> -hda /Image/vm/win7_base.img \
> -bios /usr/bin/bios.bin -enable-kvm \
> -k en-us \
> -vga none \
> -display egl-headless \
> -spice disable-ticketing,port=6901,streaming-video=off \
> -machine kernel_irqchip=on,usb=on \
> -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 \
> -cpu host -device usb-tablet \
> -device 
> vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/5b8d581a-2dc9-11e8-8238-000906258002,x-display=on,x-igd-opregion=on
> -device 
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel1,id=channel1,name=org.spice-space.stream.0 
> -chardev spiceport,name=org.spice-space.stream.0,id=charchannel1
> 
> questions:
> I am not clear How to use streaming agent and validate it, can you help me?

Hello,

So, you are using Intel vGPU and running a Windows 7 guest.

Theoretically, spice-streaming-agent can do what you want, run
on the guest to capture the video and send it via SPICE to the client.

But, currently spice-streaming-agent is written for Linux guests.
So first you'd need to make it work on Windows (for example
the virtio-serial port name is different on Windows guests, cursor
handling is different (can be disabled at first)).

Also you need a spice-streaming-agent-plugin.

The mjpeg plugin is one example (it too is written for Linux).

Look at Snir's experimental gst-plugin [1] as another example.
Possibly there exists a gstreamer src to capture windows screen and
x264 would work on Windows too.

You may want to use hardware encoding if possible.

If Intel provides a dma-buf of the host, it may be even better to
do it from the spice-server somehow, similar to what's done with virgl
(requires code-modifications).

When you have these written, you'd need

We'll be happy to know if you make progress or if you
need more help (and of course if you send patches :-)

Uri.
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