Using Viewer Plugins

You can integrate your own viewer plugin libraries with the ADAS library to display custom content based on sensor input. Typically, this is used to implement algorithms that generate an output that differs from the original sensor input. For example, this can be used to implement an edge detection algorithm that will display an edge map instead of the original content of the camera input.

To integrate your viewer plugin, you need to do the following:

In your viewer plugin library, implement the following functions from the adas_viewer_plugin.h header file:

init

For more information, see “adas_viewer_plugin_init_t.”

deinit

For more information, see “adas_viewer_plugin_deinit_t.”

program

For more information, see “adas_viewer_plugin_program_t.”

process frame

For more information, see “adas_viewer_plugin_process_t.”

Create an instance of adas_viewer_plugin_t called adas_viewer_plugin_defs and assign your function implementations to the various function pointer fields.

adas_viewer_plugin_t adas_viewer_plugin_defs = {
    .init = my_init_function,
    .program = my_program_function,
    .process_frame = my_process_frame_function,
    .deinit = my_deinit_function
};

In the file that declares adas_viewer_plugin_defs, you need to specify #define ADAS_VIEWER_PLUGIN_API_IMPLEMENT prior to including adas_viewer_plugin.h or any other ADAS library header file. This is necessary to ensure backwards compatibility with future versions of the library. This can be done as follows:
```
#define ADAS_VIEWER_PLUGIN_API_IMPLEMENT
#include <adas/adas_viewer_plugin.h>
```

Configure the viewer property by specifying a path of ADAS_VIEWER_NATIVE_CAMERA and the path of the viewer plugin library. For example:

"viewer":
    {
        "type": "ADAS_VIEWER_NATIVE_CAMERA",
        "view": "ADAS_VIEW_DRIVER",
        "window_format": "nv16",
        "path": "libviewer_plugin.so",
        "input": [
            {
                "id": "front"
            }
        ],
        "visible": "true"
    }