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    @IBAction func testPressed(_ sender: Any) {
        if (testButton.title(for: .normal) == "TEST") {
            let constraints = FPWCSApi2MediaConstraints(audio: true, video: true)!
            do {
                try WCSApi2.getMediaAccess(constraints, localDisplay.videoView)
            } catch {
                print(error)
            }
            testButton.setTitle("RELEASE", for: .normal)
        } else {
            WCSApi2.releaseLocalMedia(display: localDisplay.videoView);
            testButton.setTitle("TEST", for: .normal)
        }
    }

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