diff options
| author |   Vinod Ahuja <vahuja@unomaha.edu> | 2023-05-10 14:52:27 -0500 |
|---|---|---|
| committer |   Jan-Simon Moeller <jsmoeller@linuxfoundation.org> | 2023-05-30 11:18:04 +0000 |
| commit | 0d734156c785babe064ff32748ed01826a0a85fd (patch) | |
| tree | 9f23a42ebe5d35c3a74fb2df17c0cfc86b2e7f31 /docs/06_Component_Documentation/03_waltham_receiver_transmitter.md | |
| parent | a7be1051df95f85eae2a6aedc8631221d48545eb (diff) | |
Removing Waltham pagepike_15.92.0pike_15.91.1pike_15.91.0pike/15.92.0pike/15.91.1pike/15.91.015.92.015.91.115.91.0
Removing Waltham page as dicussed in community meeting.
Bug-AGL: [SPEC-4470]
Signed-off-by: Vinod Ahuja <vahuja@unomaha.edu>
Change-Id: Ibc28380500ba7454ac695894fd9a5f084f04f359
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/28872
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Diffstat (limited to 'docs/06_Component_Documentation/03_waltham_receiver_transmitter.md')
| -rw-r--r-- | docs/06_Component_Documentation/03_waltham_receiver_transmitter.md | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/docs/06_Component_Documentation/03_waltham_receiver_transmitter.md b/docs/06_Component_Documentation/03_waltham_receiver_transmitter.md deleted file mode 100644 index 8397f0e..0000000 --- a/docs/06_Component_Documentation/03_waltham_receiver_transmitter.md +++ /dev/null @@ -1,96 +0,0 @@ ---- -title: Waltham receiver/transmitter ---- - -# Waltham - -[Waltham protocol](https://github.com/waltham/waltham) is a IPC library similar -to [Wayland](https://wayland.freedesktop.org), developed with networking in -mind. It operates over TCP sockets, while the wayland protocol only works -locally over a UNIX socket. It retains wayland-esque paradigm, making use of -XMLs to describe the protocol, and it follows an object-oriented design with an -asynchronous architecture. - -## Differences from Wayland to Waltham - -Some of the differences between Wayland and Waltham are: - -* Waltham uses TCP sockets for communication -* Waltham cannot send file descriptors -* Waltham API is minimal and symmetric between server and client sides -* Waltham does not provide an event loop implementation -* The registry implementation is left out of the library, only the interface is - provided -* No multi-threading support for sharing objects between threads - -## Waltham-transmitter and remoting plugin - -Surface sharing is not part of Waltham protocol, each system needs to implement -the most efficient way of passing by the buffers from one side to another. On -AGL, make use of remoting-plugin to enable surface sharing which uses GStreamer -as encoder/decoder. It uses libweston DRM virtual API to grab the buffers, and -then to stream them over the network. The gstreamer pipeline uses UDP while the -input events are communicated with Waltham protocol. The input part is handled -by *waltham-transmitter* plugin which provides an API to create remote -connections and push surfaces over the network and handles remote input. The -act of pushing surface is a misnomer, kept from the older, previous -implementation, and acts a notification mechanism from the transmitter side to -the remote side. - -## The receiver client - -waltham-receiver application is a wayland demo implementation which should be -running at the remote side. It is using Waltham protocol to obtain and process -remote input events which handled the transmitter side by the waltham-transmitter -plugin. It creates a similar gstreamer pipeline to process the incoming buffers -and draw and displaying them into a subsurface created by waylandsink. - -Contrary to expectations, the waltham receiver is the one that implements the -server side of the Waltham protocol and is capable of displaying the incoming -buffers but also process input events locally and forward them with the help of -the Waltham protocol back at the transmitter side, which in turn will update -the image contents and stream to the receiver, showing the changes caused by -that input. - - - ECU 1 ECU 2 - +---------------------------------------------+ +--------------------------------------+ - | +-----------------+ | | | - | | Application | | | +-----------+-----------+ | - | +-----------------+ | | | Gstreamer | | | - | ^ | Buffer ---------------> (Decode) | | | - | wayland | +-------------------/ | +-----------+ | | - | v | | (Ethernet) | | Waltham-receiver | | - | +----+---------------------+ | | --------------------> | | - | | | Transmitter plugin |<---------------------/ | +-----------------------+ | - | | | | | | Waltham-Protocol | ^ | - | | |---------------------| | | | wayland | | - | | | Remoting plugin |-------+ | | v | - | | | | | | +---------------------+ | - | | +---------------------+ | | | | | - | | | | | | compositor | | - | | compositor | | | | | | - | +------+-------------------+ | | +----------------+----+ | - | | | | | | - | v | | v | - | +------------+ | | +----------+ | - | | Display | | | | Display | | - | | | | | | | | - | +------------+ | | +----------+ | - +---------------------------------------------+ +--------------------------------------+ - -## Migrating/Placing applications on other outputs - -In order to start or place an application on the remoting-ouput output, we can -use `agl-shell-app-id` ini entry for that particular output. - - [transmitter-output] - name=transmitter-1 - mode=640x720@30 - host=192.168.20.99 - port=5005 - agl-shell-app-id=<APP_ID> - -Alternatively, and programmatically, one can use the -[agl-shell-desktop](../02_agl_compositor#private-extensions) protocol and inform -the compositor that it should migrate it to other, remote outputs. |