did the weston do the YUV to RGB convert internally?

[tugouxp]

hi folks:


i launch a pipe line with with gstreamer command as below:
gst-launch-1.0 filesrc location=/mnt/UDISK/N_1080P_AVC_60F.avi ! avidemux ! h264parse ! omxh264dec ! queue ! waylandsink
the target sink i use was "waylandsink" , which take weston wayland server as compositor server. i grab the pipe line graph like follows picture, the waylandsink receive data format with "YV12" format, which can be supported

by my soc display hardware, but when i debug the kernel with display register, i can only found one RGB graphic layer was used, not even a single YUV layer was take up. which means there must be someone doing the
convertion job from "YV12" to "RGB" fomrat, and compositor the video picture and GUI into one layer.


but from the below picture, the only module between the YV12 gstwaylandsink and the display device is the "weston" server, so is the weston is the key to do the convertion job? can i show the yuv picuture directly without convertion?


thanks for your help!

[Daniel Stone]

Hi,

Post by tugouxp
gst-launch-1.0 filesrc location=/mnt/UDISK/N_1080P_AVC_60F.avi ! avidemux
! h264parse ! omxh264dec ! queue ! waylandsink
the target sink i use was "waylandsink" , which take weston wayland
server as compositor server. i grab the pipe line graph like follows
picture, the waylandsink receive data format with "YV12" format, which can
be supported
by my soc display hardware, but when i debug the kernel with display
register, i can only found one RGB graphic layer was used, not even a
single YUV layer was take up. which means there must be someone doing the
convertion job from "YV12" to "RGB" fomrat, and compositor the video
picture and GUI into one layer.
but from the below picture, the only module between the YV12
gstwaylandsink and the display device is the "weston" server, so is the
weston is the key to do the convertion job? can i show the yuv picuture
directly without convertion?

Weston can do this just fine, but in general you will need Weston 5.0.0
using the DRM backend in order to do so. If this is still not happening, I
recommend looking at the DRM debug information included with
https://gitlab.freedesktop.org/wayland/weston/merge_requests/10 (you will
need to rebuild from source) in order to understand why the video is not
being displayed on an overlay.

Cheers,
Daniel