timing/camera.html at main · daonewar/timing · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>TIMERTHING - Camera</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script src="/socket.io/socket.io.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs"></script>
    <script src="https://cdn.jsdelivr.net/npm/@tensorflow-models/coco-ssd"></script>
    <style>
        video, canvas { position: absolute; top: 0; left: 0; width: 100vw; height: 100vh; object-fit: cover; }
    </style>
</head>
<body class="bg-black text-white m-0 overflow-hidden font-sans">
    <video id="video" autoplay playsinline muted></video>
    <canvas id="canvas"></canvas>

    <div id="uiOverlay" class="relative z-10 p-4 flex flex-col h-screen pointer-events-none">
        <div id="controls" class="bg-black/80 backdrop-blur-md p-6 rounded-2xl border border-white/10 w-full max-w-sm pointer-events-auto shadow-2xl">
            <div id="joinArea">
                <h1 class="text-2xl font-black mb-4 tracking-tight">TIMER<span class="text-red-600">THING</span></h1>
                <div class="flex gap-2">
                    <input type="text" id="roomInput" placeholder="CODE" class="w-full bg-zinc-800 border border-zinc-700 rounded-xl px-4 py-2 text-center font-mono text-lg uppercase focus:outline-none focus:border-red-600">
                    <button id="joinBtn" class="bg-red-600 hover:bg-red-700 text-white font-bold px-6 rounded-xl transition-all">JOIN</button>
                </div>
            </div>

            <div id="activeControls" style="display:none;" class="space-y-4">
                <div class="flex justify-between items-center">
                    <h2 class="font-bold text-sm uppercase tracking-widest text-zinc-400">Alignment</h2>
                    <div class="flex gap-1">
                        <button id="zoomOut" class="bg-zinc-800 hover:bg-zinc-700 text-white font-bold px-2 py-1 rounded-lg transition-all text-[10px] uppercase border border-zinc-700">-</button>
                        <button id="zoomIn" class="bg-zinc-800 hover:bg-zinc-700 text-white font-bold px-2 py-1 rounded-lg transition-all text-[10px] uppercase border border-zinc-700">+</button>
                        <button id="flipBtn" class="bg-zinc-800 hover:bg-zinc-700 text-white font-bold px-3 py-1 rounded-lg transition-all text-[10px] uppercase border border-zinc-700">Flip</button>
                    </div>
                    <span id="status" class="text-xs font-black px-2 py-1 rounded bg-green-500/20 text-green-500 border border-green-500/50">READY</span>
                </div>
                <input type="range" id="linePos" min="0" max="100" value="50" class="w-full h-2 bg-zinc-800 rounded-lg appearance-none cursor-pointer accent-red-600">
                <p id="loadingMsg" class="text-[10px] text-red-500 uppercase font-bold text-center animate-pulse">Loading AI Model...</p>
                <p class="text-[10px] text-zinc-500 uppercase font-bold text-center">Only detects humans crossing the line</p>
            </div>
        </div>
    </div>

    <script>
        const socket = io();
        const video = document.getElementById('video');
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d', { willReadFrequently: true });
        const lineInput = document.getElementById('linePos');
        const flipBtn = document.getElementById('flipBtn');
        let videoTrack = null;
        let detector = null;
        let useFrontCamera = false;
        let currentRoom = null;
        let minSplitTime = 5000;
        let cooldown = false;
        let isDetecting = false;
        let raceStarted = false;
        let actualRaceStartTime = 0;
        let audioCtx = null;

        // Auto-fill room from URL
        const urlParams = new URLSearchParams(window.location.search);
        const roomFromUrl = urlParams.get('room');
        const storedRoom = localStorage.getItem('cameraRoomId');

        if (roomFromUrl) {
            document.getElementById('roomInput').value = roomFromUrl;
        } else if (storedRoom) {
            document.getElementById('roomInput').value = storedRoom;
        }

        // Auto-join if room is present on load
        if (document.getElementById('roomInput').value) {
            setTimeout(() => document.getElementById('joinBtn').click(), 500);
        }

        document.getElementById('joinBtn').onclick = () => {
            currentRoom = document.getElementById('roomInput').value.toUpperCase();
            localStorage.setItem('cameraRoomId', currentRoom);
            if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
            // Pre-load audio to unlock browser policy
            const unlockAudio = new Audio('start.mp3');
            unlockAudio.volume = 0;
            unlockAudio.play().catch(() => {});

            socket.emit('join-camera', currentRoom);
        };

        socket.on('race-started', (startTime) => {
            raceStarted = true;
            actualRaceStartTime = startTime;
            const statusEl = document.getElementById('status');
            statusEl.innerText = "RACE ACTIVE";
            statusEl.className = "text-xs font-black px-2 py-1 rounded bg-red-600 text-white border border-red-500 shadow-[0_0_15px_rgba(220,38,38,0.5)]";
            document.getElementById('loadingMsg').style.display = 'none';
        });

        socket.on('race-stopped', () => {
            raceStarted = false;
            const statusEl = document.getElementById('status');
            statusEl.innerText = "RACE STOPPED";
            statusEl.className = "text-xs font-black px-2 py-1 rounded bg-zinc-700 text-zinc-400 border border-zinc-600";
        });

        socket.on('play-audio', (command) => {
            if (command === 'marks') {
                const msg = new SpeechSynthesisUtterance("runners on your marks");
                window.speechSynthesis.speak(msg);
            } else if (command === 'set') {
                const msg = new SpeechSynthesisUtterance("set");
                window.speechSynthesis.speak(msg);
            } else if (command === 'start' || command === 'false-start') {
                new Audio('start.mp3').play().catch(e => console.log("Audio play blocked"));
            }
        });

        socket.on('min-split-time-update', (seconds) => {
            minSplitTime = seconds * 1000;
        });

        socket.on('race-false-start', () => {
            raceStarted = false;
            const statusEl = document.getElementById('status');
            statusEl.innerText = "FALSE START";
            statusEl.className = "text-xs font-black px-2 py-1 rounded bg-amber-600 text-white border border-amber-500 shadow-[0_0_15px_rgba(217,119,6,0.5)]";
        });

        socket.on('race-reset', () => {
            raceStarted = false;
            const statusEl = document.getElementById('status');
            statusEl.innerText = "READY";
            statusEl.className = "text-xs font-black px-2 py-1 rounded bg-green-500/20 text-green-500 border border-green-500/50";
        });

        flipBtn.onclick = () => {
            useFrontCamera = !useFrontCamera;
            startCamera();
        };

        document.getElementById('zoomIn').onclick = () => updateZoom(0.2);
        document.getElementById('zoomOut').onclick = () => updateZoom(-0.2);

        async function updateZoom(delta) {
            if (!videoTrack) return;
            try {
                const caps = videoTrack.getCapabilities();
                if (!caps.zoom) return;
                const settings = videoTrack.getSettings();
                const currentZoom = settings.zoom || 1;
                const newZoom = Math.min(caps.zoom.max, Math.max(caps.zoom.min, currentZoom + delta));
                await videoTrack.applyConstraints({ advanced: [{ zoom: newZoom }] });
            } catch (e) { console.error("Zoom not supported", e); }
        }

        socket.on('camera-joined', async () => {
            document.getElementById('joinArea').style.display = 'none';
            document.getElementById('activeControls').style.display = 'block';

            // Start camera and UI loop immediately
            startCamera();
            requestAnimationFrame(processFrame);

            // Load AI in background
            detector = await cocoSsd.load();
            document.getElementById('loadingMsg').style.display = 'none';
        });

        async function startCamera() {
            try {
                if (window.stream) {
                    window.stream.getTracks().forEach(track => track.stop());
                }
                const stream = await navigator.mediaDevices.getUserMedia({
                    video: {
                        facingMode: useFrontCamera ? "user" : "environment",
                        width: { ideal: 1280 },
                        height: { ideal: 720 }
                    }
                });
                window.stream = stream;
                video.srcObject = stream;
                videoTrack = stream.getVideoTracks()[0];
            } catch (err) {
                alert("Camera access denied or unavailable.");
            }
        }

        function processFrame() {
            requestAnimationFrame(processFrame);
            if (video.paused || video.ended || video.videoWidth === 0) return;

            if (canvas.width !== video.videoWidth || canvas.height !== video.videoHeight) {
                canvas.width = video.videoWidth;
                canvas.height = video.videoHeight;
            }

            ctx.drawImage(video, 0, 0, canvas.width, canvas.height);

            const x = Math.floor((lineInput.value / 100) * canvas.width);

            // Draw the Digital Finish Line
            ctx.beginPath();
            ctx.moveTo(x, 0);
            ctx.lineTo(x, canvas.height);
            ctx.lineWidth = 4;
            ctx.strokeStyle = cooldown ? '#ffffff' : '#dc2626';
            ctx.stroke();

            // Run AI Detection asynchronously to keep UI smooth
            if (detector && !isDetecting && !cooldown) {
                detectHumans(x);
            }
        }

        async function detectHumans(lineX) {
            isDetecting = true;

            // detect() is heavy, it returns an array of objects found
            const predictions = await detector.detect(video);

            for (let prediction of predictions) {
                if (prediction.class === 'person' && prediction.score > 0.6) {
                    const [bx, by, bw, bh] = prediction.bbox;

                    // Scale the bbox to canvas size
                    const scaleX = canvas.width / video.videoWidth;
                    const personLeft = bx * scaleX;
                    const personRight = (bx + bw) * scaleX;

                    // Optional: Draw box for debugging
                    ctx.strokeStyle = 'rgba(0, 255, 0, 0.5)';
                    ctx.lineWidth = 2;
                    ctx.strokeRect(bx * scaleX, by * (canvas.height/video.videoHeight), bw * scaleX, bh * (canvas.height/video.videoHeight));

                    // Check if person's body intersects the line
                    if (lineX >= personLeft && lineX <= personRight) {
                        triggerDetection();
                        break;
                    }
                }
            }

            isDetecting = false;
        }

        function triggerDetection() {
            if (!raceStarted) return;

            // Ignore splits for the first 5 seconds to account for people crossing start line
            if (Date.now() - actualRaceStartTime < minSplitTime) return;

            cooldown = true;

            // Small little beep
            try {
                const oscillator = audioCtx.createOscillator();
                const gainNode = audioCtx.createGain();
                oscillator.type = 'square';
                oscillator.frequency.setValueAtTime(440, audioCtx.currentTime);
                oscillator.connect(gainNode);
                gainNode.connect(audioCtx.destination);
                gainNode.gain.setValueAtTime(0.1, audioCtx.currentTime);
                oscillator.start();
                oscillator.stop(audioCtx.currentTime + 0.1);
            } catch(e) {}

            const statusEl = document.getElementById('status');
            statusEl.innerText = "DETECTED!";
            statusEl.className = "text-xs font-black px-2 py-1 rounded bg-white text-black border border-white";

            // Capture a snapshot of the current frame
            const imageData = canvas.toDataURL('image/jpeg', 0.5);

            socket.emit('detection', { roomId: currentRoom, timestamp: Date.now(), image: imageData });

            setTimeout(() => {
                cooldown = false;
                statusEl.innerText = "READY";
                statusEl.className = "text-xs font-black px-2 py-1 rounded bg-green-500/20 text-green-500 border border-green-500/50";
            }, 1500);
        }
    </script>
</body>
</html>