porst17/latency-check.html

## latency-check.html
<!doctype html>

<html lang="en">

<head>
    <meta charset="utf-8">

    <title>WebAudio Latency Checker</title>
    <meta name="description" content="Connects user input directly with WebAudio output in order to check for the minimal achievable latency">
    <meta name="author" content="Christian Stussak">
</head>

<body>
    Please use headphones for this test. Otherwise, it might cause a feedback loop!
    <br />
    <input type=button onClick=start() value="Start" />
    <input type=button onClick=stop() value="Stop" />
    <br />
    <tt>AudioContext.baseLatency=<span id="baseLatency"></span></tt><br />
    <tt>AudioContext.outputLatency=<span id="outputLatency"></span></tt>
    <script>
        const AudioContext = window.AudioContext || window.webkitAudioContext;

        let audioCtx = undefined;
        let stream = undefined;
        let source = undefined;

        function start() {
            stop();
            audioCtx = new AudioContext();
            document.getElementById("baseLatency").innerHTML = audioCtx.baseLatency;
            document.getElementById("outputLatency").innerHTML = audioCtx.outputLatency;

            navigator.mediaDevices.getUserMedia({
                    audio: {
                        latency: 0.001
                    },
                    video: false
                })
                .then(s => {
                    stream = s;
                    source = audioCtx.createMediaStreamSource(stream);
                    source.connect(audioCtx.destination);


                    stream.getAudioTracks().forEach(t => console.log(t.getSettings()));
                });
        }

        function stop() {
            if (audioCtx != undefined) {
                source.disconnect();
                stream.getAudioTracks().forEach(t => t.stop());
                audioCtx.close();

                audioCtx = undefined;
                stream = undefined;
                source = undefined;
            }
        }
    </script>
</body>

</html>
	<!doctype html>

	<html lang="en">

	<head>
	<meta charset="utf-8">

	<title>WebAudio Latency Checker</title>
	<meta name="description" content="Connects user input directly with WebAudio output in order to check for the minimal achievable latency">
	<meta name="author" content="Christian Stussak">
	</head>

	<body>
	Please use headphones for this test. Otherwise, it might cause a feedback loop!
	<br />
	<input type=button onClick=start() value="Start" />
	<input type=button onClick=stop() value="Stop" />
	<br />
	<tt>AudioContext.baseLatency=<span id="baseLatency"></span></tt><br />
	<tt>AudioContext.outputLatency=<span id="outputLatency"></span></tt>
	<script>
	const AudioContext = window.AudioContext \|\| window.webkitAudioContext;

	let audioCtx = undefined;
	let stream = undefined;
	let source = undefined;

	function start() {
	stop();
	audioCtx = new AudioContext();
	document.getElementById("baseLatency").innerHTML = audioCtx.baseLatency;
	document.getElementById("outputLatency").innerHTML = audioCtx.outputLatency;

	navigator.mediaDevices.getUserMedia({
	audio: {
	latency: 0.001
	},
	video: false
	})
	.then(s => {
	stream = s;
	source = audioCtx.createMediaStreamSource(stream);
	source.connect(audioCtx.destination);



	stream.getAudioTracks().forEach(t => console.log(t.getSettings()));
	});
	}

	function stop() {
	if (audioCtx != undefined) {
	source.disconnect();
	stream.getAudioTracks().forEach(t => t.stop());
	audioCtx.close();

	audioCtx = undefined;
	stream = undefined;
	source = undefined;
	}
	}
	</script>
	</body>

	</html>