main.ts

/**
 * A custom extension THAT ONLY WORKS in exported slides.
 * Please read the README.md file to setup this project with
 * your game.
 */
namespace webcam {
    const CHANNEL = "webcam"
    const EVENT_ID = 4567
    const FRAME_EVENT = 1

    let initialized = false;
    export let currentFrame: Image = undefined;

    /**
     * Registers a handler when an image is onReceived
     * from the webcam
    */
    export function onFrameReceived(handler: () => void) {
        init()
        control.onEvent(EVENT_ID, FRAME_EVENT, function() {
            if (handler)
                handler();
        })
    }

    function init() {
        if (initialized) return;        
        initialized = true;

        control.simmessages.onReceived(CHANNEL, function(msg: Buffer) {
            // buffer is the encoded image
            currentFrame = image.ofBuffer(msg);
            control.raiseEvent(EVENT_ID, FRAME_EVENT)
        })
    }
}