Initial commit

AIR Monitoring/backend/server.js

@@ -0,0 +1,62 @@
+const express = require('express');
+const cors = require('cors');
+const { spawn } = require('child_process');
+const dotenv = require('dotenv');
+
+dotenv.config();
+
+const app = express();
+app.use(cors());
+
+const port = process.env.PORT || 3000;
+const rtspUrl = process.env.RTSP_URL;
+
+app.get('/stream', (req, res) => {
+    if (!rtspUrl) {
+        return res.status(500).send('RTSP_URL not configured in .env');
+    }
+
+    res.writeHead(200, {
+        'Content-Type': 'multipart/x-mixed-replace; boundary=ffserver',
+        'Cache-Control': 'no-cache',
+        'Connection': 'close',
+        'Pragma': 'no-cache'
+    });
+
+    const ffmpegArgs = [
+        '-rtsp_transport', 'tcp',
+        '-i', rtspUrl,
+        '-f', 'mpjpeg',
+        '-r', '15',           // 15 fps is enough for motion detection
+        '-q:v', '5',          // Quality (2-31, lower is better)
+        '-s', '1280x720',     // Resize to 720p to save bandwidth and CPU
+        '-'                   // Output to stdout
+    ];
+
+    console.log('Starting ffmpeg with args:', ffmpegArgs.join(' '));
+    const ffmpeg = spawn('ffmpeg', ffmpegArgs);
+
+    ffmpeg.stdout.on('data', (data) => {
+        res.write(data);
+    });
+
+    ffmpeg.stderr.on('data', (data) => {
+        // Uncomment for debugging ffmpeg errors
+        // console.error(`ffmpeg stderr: ${data.toString()}`);
+    });
+
+    ffmpeg.on('close', (code) => {
+        console.log(`ffmpeg process exited with code ${code}`);
+        res.end();
+    });
+
+    req.on('close', () => {
+        console.log('Client disconnected, killing ffmpeg process');
+        ffmpeg.kill('SIGKILL');
+    });
+});
+
+app.listen(port, () => {
+    console.log(`Server listening on port ${port}`);
+    console.log(`MJPEG Stream available at http://localhost:${port}/stream`);
+});