For clients that cannot accept a dmabuf fd directly (such as those running on a remote system), this patch series provides a way for the Spice server to stream the gl/dmabuf data/buffer instead. This is mostly done by enabling the creation of Gst memory using a dmabuf fd as the source. This ability is useful given that dmabuf is the standard mechanism for sharing buffers between various drivers and userspace in many Graphics and Media usecases. Currently, this is only used/tested with Qemu and remote-viewer using the x264enc/dec codec to stream the Guest/VM desktop but it can be easily extended to other plugins and applications. Here is roughly how things work: - The application (e.g, Qemu) chooses its preferred codec (a Gstreamer one) and calls gl_scanout (to update the fd) followed by gl_draw. - In response, the Spice server checks to see if the client is capable of accepting a dmabuf fd directly or not. If yes, the fd is forwarded directly to the client; otherwise, a new stream is created. - The Spice server then sends the dmabuf fd to the Gstreamer encoder which uses it as an input for creating an encoded buffer which is then sent to the client. - Once the encoding process is done, an async completion cookie is sent to the application. Here is a link to the previous version that used a drawable to share the dmabuf fd with the Gstreamer encoder: https://lists.freedesktop.org/archives/spice-devel/2023-January/052948.html Cc: Frediano Ziglio <freddy77@xxxxxxxxx> Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx> Cc: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx> Cc: Dongwon Kim <dongwon.kim@xxxxxxxxx> Vivek Kasireddy (5): dcc: Check to see if the client supports multiple codecs dcc: Create a stream associated with gl_draw for non-gl clients dcc-send: Encode and send gl_draw stream data to the remote client gstreamer-encoder: Add an encoder function that takes dmabuf fd as input video-stream: Don't stop a stream if a gl_draw operation is pending meson.build | 2 +- server/dcc-private.h | 4 ++ server/dcc-send.cpp | 89 ++++++++++++++++++++++- server/dcc.cpp | 36 +++++++--- server/display-channel-private.h | 6 ++ server/gstreamer-encoder.c | 119 ++++++++++++++++++++++++++++++- server/video-encoder.h | 13 ++++ server/video-stream.cpp | 65 ++++++++++++++++- server/video-stream.h | 2 + 9 files changed, 319 insertions(+), 17 deletions(-) -- 2.37.2