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+**Table of Content**
+waltham-client uses Waltham IPC library to connect to remote host and transmit
+client buffers using GStreamer framework.
+waltham-client is divided into two components:
+* waltham-transmitter plugin: waltham-transmitter plugin provides API to create
+ remote connections and push surfaces over the network and handles both remote
+ output and remote input. Loaded automatically at start-up, by the compositor.
+* waltham-renderer: waltham-renderer is the implementation for sharing surface.
+ It creates a buffer to be transmitted to other domain. Latest implementation
+ uses GStreamer framework.
+waltham-receiver is a sample implementation of the receiver app which shall be
+running at the remote side. It is developed based on [waltham
+server](https://github.com/waltham/waltham/tree/master/tests), using Waltham
+protocol to obtain and process remote output, which is sent by
+waltham-transmitter. This component is designed to be used for evaluating the
+functionality of waltham-transmitter plugin.
+## How it works
+### 1. Loading and initialization
+As the compositor is starting up, it loads the waltham-transmitter plugin.
+waltham-client connects to the receiver application at the remote side during
+### 2. Establishing connection
+At `transmitter_create_remote()`, waltham-transmitter creates
+`weston_transmitter_remote` object which expresses the receiver object at
+remote side, and it is created for each receiver.
+*waltham-transmitter* uses `wth_display_get_registry()` and `wth_display_sync()`
+for the receiver applications in the same manner as the Wayland protocol
+would retrieve the interfaces. Then, the receiver applications sends back
+the resource list to the waltham-transmitter.
+### 3. Forwarding surface
+While the compositor redraws the surface, waltham-transmitter sends waltham
+protocol messages to the receiver app to notify about those surface updates.
+`wthp_surface_attach()`, `wthp_surface_damage()` and `wthp_surface_commit()`
+correspond to `wl_surface_attach()`, `wl_surface_damage()` and
+`wl_surface_commit()` message in wayland protocol.
+- `wthp_surface_attach()` - Send wthp_buffer as a buffer handling. This is not
+the actual buffer which contains the data to be rendered but the handle of an
+actual buffer. It abstracts the differences of buffer type.
+- `wthp_surface_damage()` - Tell the updated region to receiver app.
+- `wthp_surface_commit()` - Tell surface gets updated to receiver app.
+### 4. Rendering using GStreamer
+### 5. Input handling
+For handling input events, waltham-transmitter has 2 ways to secure seat.
+1. Use `wl_seat` as weston has.
+2. Create a new `wl_seat`.
+Second case is applicable in case the transmitter side does not have an input
+device but the receiver at remote side has one. After `wl_seat` is created,
+waltham-transmitter sends input events to the client application when
+it gets an input event from the receiver via the Waltham protocol.
+The message wthp_send_XXX shows you that input event is forwarded from the
+receiver to the transmitter, XXX is filled by the input event name.
+### 6. Retry connection
+In case the connection gets disconnected during surface sharing,
+waltham-transmitter shall re-establish the connection. The `waltham_display`
+objects represents the connection between the transmitter and the receiver,
+and contains a flag that can be used to detect a disconnect.
+That happens in `connection_handle_data()` in case a disconnect
+is detected. This flag is checked at every call of
+`transmitter_surface_gather_state`. When running is in false state,
+waltham-transmitter starts to retry the handling sequence
+It release the waltham protocol objects then it goes to establish a connection
+sequence mentioned in 2. Establishing connection.
+## Waltham in practice
+Here is the example how waltham can be used in hypervisor use case of real
+* Weston is used as the wayland compositor.
+* waltham-client is implemented for Weston which acts as a Waltham virtual
+* Application surface is assigned to Waltham virtual display and it's sent to
+ the other ECU/OS. Buffers of surface are transferred via GStreamer(UDP),
+ since transferring raw pixel data via Waltham(TCP) is not fast enough.
+* Controlling input events (pointer, keyboard, touch) for the surface is
+ handled by Waltham.
+## How Waltham can be integrated
+Some possible integration examples of waltham follow.
+### As an EGL backend (theoretical possibility)
+Similarly to Wayland back-end for EGL, Waltham client could be a back-end in
+the compositor. For better performance, a generic surface sharing mechanism is
+needed in a hypervisor environment. Applications need to adapt to Waltham.
+As waltham is not designed with this use in mind this usage is just a
+### As a GStreamer sink (theoretical possibility)
+Similarly to Wayland sink, a Waltham sink GStreamer plugin can be implemented
+which sends the buffers to a receiver on another domain/OS. Waltham sink can
+utilize frame synchronization and a presentation feedback protocols for video
+synchronization. For better performance, a generic surface sharing mechanism
+is needed in a hypervisor environment. As Waltham is not designed with this
+use in mind this usage is just a theoretical possibility.
+### As a virtual display in compositor
+Virtual display plugin can be implemented in the compositor. This plugin sends
+client buffers to waltham-receiver in another domain. No changes to
+applications. For good performance, a generic surface sharing mechanism is
+needed in hypervisor environment. This is the intended use in mind during