export function getColorByString(str: string) : string|null {
    let hash = 0;
    if (str.length === 0) {
        return null;
    }
    for (let i = 0; i < str.length; i++) {
        hash = str.charCodeAt(i) + ((hash << 5) - hash);
        hash = hash & hash;
    }
    let color = '#';
    for (let i = 0; i < 3; i++) {
        const value = (hash >> (i * 8)) & 255;
        color += ('00' + value.toString(16)).substr(-2);
    }
    return color;
}

export function srcObject(node: HTMLVideoElement, stream: MediaStream) {
    node.srcObject = stream;
    return {
        update(newStream: MediaStream) {
            if (node.srcObject != newStream) {
                node.srcObject = newStream
            }
        }
    }
}