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    @IBAction func playPressed(_ sender: Any) {
        changeViewState(playButton,false)
        if (playButton.title(for: .normal) == "PLAY") {
            ...
        } else{
            do {
                try playStream?.stop();
            } catch {
                print(error);
            }
        }
    }

    @IBAction func publishPressed(_ sender: Any) {
        changeViewState(publishButton,false)
        if (publishButton.title(for: .normal) == "PUBLISH") {
            ...
        } else {
            do {
                try publishStream?.stop();
            } catch {
                print(error);
            }
        }
        
    }