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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Smart Audio Recorder</title>
<style>
body {
font-family: 'Arial', sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background-color: #f5f5f5;
}
.container {
background-color: white;
padding: 20px;
border-radius: 10px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.record-button {
background-color: #ff4444;
color: white;
border: none;
padding: 15px 30px;
border-radius: 25px;
font-size: 18px;
cursor: pointer;
transition: background-color 0.3s;
}
.record-button.recording {
background-color: #cc0000;
animation: pulse 1.5s infinite;
}
.status {
margin-top: 20px;
padding: 10px;
border-radius: 5px;
background-color: #f8f9fa;
}
@keyframes pulse {
0% { transform: scale(1); }
50% { transform: scale(1.05); }
100% { transform: scale(1); }
}
.meter {
height: 20px;
background-color: #e9ecef;
border-radius: 10px;
margin: 20px 0;
overflow: hidden;
}
.meter-fill {
height: 100%;
width: 0%;
background-color: #4CAF50;
transition: width 0.1s;
}
.error {
color: #dc3545;
padding: 10px;
margin-top: 10px;
border: 1px solid #dc3545;
border-radius: 5px;
display: none;
}
</style>
</head>
<body>
<div class="container">
<h1>Smart Audio Recorder</h1>
<p>Records when active audio is detected. Saves only recordings with more than 5 seconds of active audio.</p>
<button id="recordButton" class="record-button">Start Recording</button>
<div class="meter">
<div id="meterFill" class="meter-fill"></div>
</div>
<div id="status" class="status">Ready to record</div>
<div id="error" class="error"></div>
</div>
<script>
class SmartRecorder {
constructor() {
this.mediaRecorder = null;
this.audioContext = null;
this.analyser = null;
this.chunks = [];
this.activeAudioTime = 0;
this.lastActiveTime = 0;
this.isRecording = false;
this.silenceThreshold = 0.015;
this.minActiveAudio = 5; // seconds
this.recordButton = document.getElementById('recordButton');
this.status = document.getElementById('status');
this.meterFill = document.getElementById('meterFill');
this.errorDiv = document.getElementById('error');
this.recordButton.addEventListener('click', () => this.toggleRecording());
// Check if we're running on localhost or HTTPS
if (!(window.location.protocol === 'https:' || window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1')) {
this.showError('This application requires HTTPS or localhost to access the microphone.');
this.recordButton.disabled = true;
return;
}
this.setupAudioContext();
}
showError(message) {
this.errorDiv.textContent = message;
this.errorDiv.style.display = 'block';
console.error(message);
}
async setupAudioContext() {
try {
const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
this.audioContext = new AudioContext();
const source = this.audioContext.createMediaStreamSource(stream);
this.analyser = this.audioContext.createAnalyser();
this.analyser.fftSize = 2048;
source.connect(this.analyser);
this.errorDiv.style.display = 'none';
} catch (err) {
this.showError(`Error accessing microphone: ${err.message}`);
this.recordButton.disabled = true;
}
}
async toggleRecording() {
if (!this.isRecording) {
await this.startRecording();
} else {
await this.stopRecording();
}
}
async startRecording() {
try {
const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
this.mediaRecorder = new MediaRecorder(stream);
this.chunks = [];
this.activeAudioTime = 0;
this.lastActiveTime = Date.now();
this.isRecording = true;
this.mediaRecorder.ondataavailable = (e) => this.chunks.push(e.data);
this.mediaRecorder.start();
this.recordButton.classList.add('recording');
this.recordButton.textContent = 'Stop Recording';
this.status.textContent = 'Recording...';
this.errorDiv.style.display = 'none';
this.startAudioAnalysis();
} catch (err) {
this.showError(`Error starting recording: ${err.message}`);
}
}
async stopRecording() {
if (!this.mediaRecorder) return;
this.isRecording = false;
this.mediaRecorder.stop();
this.recordButton.classList.remove('recording');
this.recordButton.textContent = 'Start Recording';
this.mediaRecorder.onstop = async () => {
if (this.activeAudioTime >= this.minActiveAudio) {
const blob = new Blob(this.chunks, { type: 'audio/wav' });
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = `recording_${new Date().toISOString()}.wav`;
link.click();
this.status.textContent = `Saved recording with ${this.activeAudioTime.toFixed(1)} seconds of active audio`;
} else {
this.status.textContent = `Recording discarded: Only ${this.activeAudioTime.toFixed(1)} seconds of active audio (minimum ${this.minActiveAudio}s required)`;
}
this.meterFill.style.width = '0%';
};
}
startAudioAnalysis() {
const analyzeFrame = () => {
if (!this.isRecording) return;
const dataArray = new Float32Array(this.analyser.frequencyBinCount);
this.analyser.getFloatTimeDomainData(dataArray);
const rms = Math.sqrt(dataArray.reduce((acc, val) => acc + val * val, 0) / dataArray.length);
if (rms > this.silenceThreshold) {
const now = Date.now();
const timeDiff = (now - this.lastActiveTime) / 1000;
this.activeAudioTime += timeDiff;
this.lastActiveTime = now;
}
// Update meter
const meterLevel = Math.min(100, (rms * 400));
this.meterFill.style.width = `${meterLevel}%`;
// Update status with active audio time
if (this.isRecording) {
this.status.textContent = `Recording... Active audio: ${this.activeAudioTime.toFixed(1)}s`;
}
requestAnimationFrame(analyzeFrame);
};
analyzeFrame();
}
}
// Initialize recorder when page loads
window.addEventListener('load', () => {
new SmartRecorder();
});
</script>
</body>
</html> |