Original question:
I want to overlay two display layers through gstreamer. One way the camera data is displayed through kmssink into the layer plane_id=31 in DRM (overlay), and the other way the image is drawn into the layer plane_id=41 in DRM by creating a new plug-in.
I know, DRM supported two layers,Support layer overlay and transparency(alpha) Settings
But Whether gstreamer is supported? If not, do you have any suggestions? How to modify
pipeline for example：
No,Those are two questions. Another case is that sdk version differences cause the kmssink display frame rate to halve;
The case is whether kmssink that supports multi-process access will halve the frame rate as more processes access it.
In the Another case, I checked that there was parameter influence. But this case, I tested that multiple processes would halve the frame rate
if
one process : FPS ：60
two process : FPS: 30
three process : FPS: 20
four process : FPS: 15
Your idea is to use a decoupled DRM master to achieve multi-process access, but the frame rate will be halved. I feel that if we change to Atomic interface, there will be no frame rate drop problem.
exec cmd: (two process)
gst-launch-1.0 -v -e \
v4l2src device=/dev/video0 io-mode=dmabuf-import ! \
video/x-bayer,width=1920,height=1080,format=bggr12, framerate=60/1 ! \
queue2 max-size-buffers=0 ! tiovxisp sensor-name=SENSOR_OV_0X03C10_RPI dcc-isp-file=/opt/imaging/ovx03c10/dcc_viss_wdr.bin format-msb=11 \
sink_0::dcc-2a-file=/opt/imaging/ovx03c10/dcc_2a_wdr.bin sink_0::device=/dev/v4l-subdev2 ! video/x-raw, format=NV12 ! \
queue2 max-size-buffers=0 ! tiovxmultiscaler name=split_01 src_0::roi-startx=0 src_0::roi-starty=0 src_0::roi-width=1920 src_0::roi-height=1080 target=0 \
\
split_01. ! queue2 max-size-buffers=0 ! video/x-raw, width=1280, height=768,framerate=60/1 ! \
fpsdisplaysink text-overlay=false sync=false video-sink="kmssink driver-name=tidss force-modesetting=true plane-id=31 " \
\
split_01. ! queue2 max-size-buffers=0 ! video/x-raw, width=1280, height=768 ! \
\
queue2 max-size-buffers=0 ! tiovxmultiscaler ! video/x-raw,format=NV12, width=1280, height=200 ! \
queue2 max-size-buffers=0 ! kmssink driver-name=tidss plane-id=41 render-rectangle='<0,0,1280,200>' sync=false plane-properties="a, alpha=30000"
