audio-spectrum visualizer

simonw · web-flow · commit 1390c401fa2e · 2024-08-23T22:04:39.000-07:00
By Claude 3.5 Sonnet: https://gist.github.com/simonw/48b2762d1c77e529d3c36e75ee6f478b
diff --git a/audio-spectrum.html b/audio-spectrum.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Audio Spectrum Visualizer</title>
+    <style>
+        body {
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            height: 100vh;
+            margin: 0;
+            background-color: #f0f0f0;
+        }
+        canvas {
+            border: 1px solid #000;
+        }
+    </style>
+</head>
+<body>
+    <canvas id="canvas" width="800" height="300"></canvas>
+    <script>
+        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
+        const canvas = document.getElementById('canvas');
+        const canvasCtx = canvas.getContext('2d');
+        let analyser;
+
+        async function setupAudio() {
+            try {
+                const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+                const source = audioContext.createMediaStreamSource(stream);
+                analyser = audioContext.createAnalyser();
+                analyser.fftSize = 2048;
+                source.connect(analyser);
+                draw();
+            } catch (err) {
+                console.error('Error accessing microphone:', err);
+            }
+        }
+
+        function draw() {
+            const bufferLength = analyser.frequencyBinCount;
+            const dataArray = new Uint8Array(bufferLength);
+
+            function drawSpectrum() {
+                requestAnimationFrame(drawSpectrum);
+
+                analyser.getByteFrequencyData(dataArray);
+
+                canvasCtx.fillStyle = 'rgb(200, 200, 200)';
+                canvasCtx.fillRect(0, 0, canvas.width, canvas.height);
+
+                const barWidth = (canvas.width / bufferLength) * 2.5;
+                let x = 0;
+
+                for (let i = 0; i < bufferLength; i++) {
+                    const barHeight = dataArray[i]; // Removed division by 2
+
+                    canvasCtx.fillStyle = `rgb(${barHeight + 100}, 50, 50)`;
+                    canvasCtx.fillRect(x, canvas.height - barHeight, barWidth, barHeight);
+
+                    x += barWidth + 1;
+                }
+            }
+
+            drawSpectrum();
+        }
+
+        setupAudio();
+    </script>
+</body>
+</html>
