did the weston do the YUV to RGB convert internally?

[Daniel Stone]

Hi,

On Tue, 4 Sep 2018 at 13:15, tugouxp <13824125580 at 163.com> wrote:

> 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?
>

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
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