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File size: 3,893 Bytes
0f623ae | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | # Step 3 — Frontend
**Status: TODO**
## Goal
A simple webpage where the user uploads an audio file, waits while Demucs processes it, then plays back both the original and the cleaned vocal track side by side.
---
## Files to create
```
frontend/
├── index.html # Upload form + audio players
├── style.css # Basic layout and styling
└── app.js # Handles upload, polling, and playback
```
---
## How to build it
### 1. Create `frontend/index.html`
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Voice Isolation</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="card">
<h1>Voice Isolation</h1>
<p>Upload an audio file to remove background noise.</p>
<input type="file" id="fileInput" accept="audio/*">
<button id="uploadBtn">Upload & Clean</button>
<div id="status"></div>
<div class="players" id="players" hidden>
<div>
<p>Original</p>
<audio id="originalPlayer" controls></audio>
</div>
<div>
<p>Cleaned</p>
<audio id="cleanedPlayer" controls></audio>
</div>
</div>
</div>
<script src="app.js"></script>
</body>
</html>
```
### 2. Create `frontend/app.js`
```javascript
const uploadBtn = document.getElementById('uploadBtn');
const fileInput = document.getElementById('fileInput');
const status = document.getElementById('status');
const players = document.getElementById('players');
const originalPlayer = document.getElementById('originalPlayer');
const cleanedPlayer = document.getElementById('cleanedPlayer');
uploadBtn.addEventListener('click', async () => {
const file = fileInput.files[0];
if (!file) {
status.textContent = 'Please select a file first.';
return;
}
status.textContent = 'Uploading and processing... this takes 1-3 minutes.';
players.hidden = true;
const formData = new FormData();
formData.append('file', file);
const response = await fetch('http://localhost:8000/upload', {
method: 'POST',
body: formData,
});
const data = await response.json();
originalPlayer.src = URL.createObjectURL(file);
cleanedPlayer.src = `http://localhost:8000${data.download_url}`;
players.hidden = false;
status.textContent = 'Done!';
});
```
### 3. Create `frontend/style.css`
```css
body {
font-family: sans-serif;
background: #f4f4f4;
display: flex;
justify-content: center;
padding: 40px 20px;
}
.card {
background: white;
padding: 32px;
border-radius: 12px;
box-shadow: 0 2px 12px rgba(0,0,0,0.1);
max-width: 560px;
width: 100%;
}
h1 { margin-top: 0; }
input[type="file"] { display: block; margin: 16px 0; }
button {
background: #2563eb;
color: white;
border: none;
padding: 10px 20px;
border-radius: 6px;
cursor: pointer;
font-size: 16px;
}
button:hover { background: #1d4ed8; }
#status { margin: 16px 0; color: #555; }
.players {
display: flex;
flex-direction: column;
gap: 16px;
margin-top: 16px;
}
```
---
## How to open it
Just open the HTML file directly in the browser — no server needed for the frontend:
```bash
xdg-open frontend/index.html # Linux
```
Make sure the FastAPI backend is running first:
```bash
source venv/bin/activate
uvicorn backend.main:app --reload
```
---
## What the user sees
1. Opens the page — sees a clean upload card
2. Selects an audio file
3. Clicks "Upload & Clean"
4. Status shows "Processing..." while Demucs runs
5. Two audio players appear: original and cleaned
6. User hits play on both to compare
---
## Notes
- The backend URL is hardcoded to `localhost:8000` — update this to the live Hugging Face URL after deployment
- No file type validation on the frontend yet — the backend will reject non-audio files anyway
- Processing takes 1–3 minutes on CPU — the status message sets that expectation for the user
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