Instructions

1. To build wayland-protocols with 1.18 version(Required for weston 7.0.0):
   1. Copy wayland-protocols_1.18.bb file in "meta-agl/meta-agl-bsp/recipes-graphics/wayland" path.
2. To build Weston with Transmitter-backend:
   
   1. Copy  weston_7.0.0.bb  file in "meta-agl/meta-agl-profile-graphical/recipes-graphics/wayland/" path.
   2.  Add below line in local.conf
      BBMASK += "${METADIR}/meta-agl/meta-agl-profile-graphical/recipes-graphics/wayland/weston_%.bbappend"
      IMAGE_INSTALL_remove = " weston-conf"
3. To Build wayland-ivi-extension compatible with  weston 7.0.0:
   1. For AGL 8.0.2: Apply 0001-make-ivi-extension-compatible-with-weston-7.0.0.patch in "meta-agl/" folder.

OR

instead of above steps just checkout the below sandbox for met-agl below. The sand box has updated weston_7.0.0.bb file which fetch the latest source code with fixes.

https://gerrit.automotivelinux.org/gerrit/gitweb?p=AGL/meta-agl.git;a=shortlog;h=refs/heads/sandbox/vkadasani/ces2020_waltham_backend

1. Rebuild weston and wayland-ivi-extension and copy the libraries to target

   $bitbake -c cleansstate weston wayland-ivi-extension
   $bitbake wayland-ivi-extension

2. copy waltham libraries
   build/tmp/work/aarch64-agl-linux/waltham/git-r0/image/usr/* to target /usr

3. run, use below files in rcar board:
   1. /etc/xdg/weston/weston.ini

      [core]
      shell=ivi-shell.so
      backend=transmitter-backend.so
      require-input=false
      modules=ivi-controller.so
      #repaint-window=34
      
      # A display is connected to HDMI-A-1 and needs to be rotated 270 degrees
      # to have a proper orientation of the homescreen.  For example the various sizes
      # of the GeChic display or the Dell display.
      #[output]
      #name=HDMI-A-1
      #transform=270
      
      [desktop-app-default]
      default-surface-id=2000000
      default-surface-id-max=2001000
      
      [ivi-shell]
      ivi-input-module=ivi-input-controller.so
      ivi-id-agent-module=ivi-id-agent.so
      transition-duration=300
      cursor-theme=default
      
      [shell]
      locking=true
      panel-position=none
      
      [transmitter-output]
      output-name=transmitter_1
      server-address=192.168.2.52
      port=34400
      width=1920
      height=1080

   2. define pipeline

      1. jpeg enc/dec

         /etc/xdg/weston/transmitter_pipeline.cfg on transitter side

         appsrc name=src max-bytes=0 ! vspfilter ! video/x-raw,format=I420 ! jpegenc ! rtpjpegpay ! udpsink name=sink host=192.168.2.52 port=34400 sync=false async=false

         /etc/xdg/weston/receiver_pipeline.cfg on receiver side

         udpsrc port=34400  caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)JPEG,payload=(int)26" ! rtpjpegdepay ! jpegdec ! waylandsink name=sink

      2. rcar specific HW end/dec
         This ticked should be fixed to use HW setup on v8.0.2. https://jira.automotivelinux.org/browse/SPEC-2934

         /etc/xdg/weston/transmitter_pipeline.cfg on transitter side

         appsrc name=src ! videoconvert ! video/x-raw,format=I420 ! omxh264enc bitrate=3000000 control-rate=2 ! rtph264pay ! udpsink name=sink host=192.168.2.52 port=34400 sync=false async=false

         /etc/xdg/weston/receiver_pipeline.cfg on receiver side

         udpsrc port=34400 caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264,payload=(int)96" ! rtpjitterbuffer latency=0 ! rtph264depay ! h264parse config-interval=1  disable-passthrough=true ! omxh264dec no-reorder=true ! waylandsink name=sink

4. Command to run in following sequence:

   Steps	Transmitter side	Receiver side
   1	ifconfig eth0 192.168.2.51
   2		systemctl stop weston ifconfig eth0 192.168.2.52 export XDG_RUNTIME_DIR=/tmp sleep 1 weston --tty=1 & sleep 1 waltham-receiver -p 34400 & sleep 1 layer-add-surfaces -s 1 -l 1 -d HDMI-A-1 &
   3	weston --tty=2 & layer-add-surfaces 1 1 & EGLWLMockNavigation

Issues and Limitations

1. weston doesn't start from systemd service file.
   → ADIT has a patch to fix it. But still systemd notification doesn't work and should be fixed.
2. EGLWLInputEventExample doen't appear at first frame need mouse to be connected.
   → ADIT has a patch to fix it.
3. When weston run without receiver side, weston dump core occasionally.
   → ADIT has a patch to fix it.
4. weston gets hang occasionally. In this case, if you execute LayerManagerControl, it has never returned.
   → ADIT has a patch to fix it.
5. waltham backend can transmitt only one surface. If virtual screen has two more surfaces, waltham backend does nothing.
   → ADIT has draft patches to composite multiple surfaces to one and transmit.

Q&A

How to change ip address of receiver (server) side?

Tow files in transmitter side should be changed.

• weston.ini for waltham protocol itself.
  • [transmitter-output]
    server-address=192.168.2.52
• transmitter_pipeline.cfg for gstreamer.
  
  • udpsink name=sink host=192.168.2.52

Todo

waltham transmitter recipe has unnecessary dependency. gstreamer and gstreamer1.0. should be one.