Kai Chappell
1660696d7f
Stream a phone's camera to a tablet over WiFi/hotspot. WebSocket transport with native YUV-to-JPEG encoding, UDP auto-discovery, remote control (zoom, flash, camera switch, rotate, mirror) from the viewer.
391 lines
11 KiB
Dart
391 lines
11 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:wakelock_plus/wakelock_plus.dart';
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import 'package:external_cam/frame_server.dart';
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class ViewerScreen extends StatefulWidget {
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const ViewerScreen({super.key});
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@override
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State<ViewerScreen> createState() => _ViewerScreenState();
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}
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class _ViewerScreenState extends State<ViewerScreen> {
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final _ipController = TextEditingController();
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WebSocket? _socket;
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Uint8List? _currentFrame;
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bool _isConnected = false;
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bool _isSearching = true;
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bool _isConnecting = false;
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int _fps = 0;
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int _frameCount = 0;
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int _rotation = 0;
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bool _mirrored = false;
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Timer? _fpsTimer;
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int _cameraCount = 0;
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bool _flashOn = false;
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String _lensDirection = '';
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String _cameraName = '';
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double _zoom = 1.0;
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double _minZoom = 1.0;
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double _maxZoom = 1.0;
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int _quality = 50;
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@override
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void initState() {
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super.initState();
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SystemChrome.setPreferredOrientations([
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DeviceOrientation.landscapeLeft,
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DeviceOrientation.landscapeRight,
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]);
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SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky);
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_autoDiscover();
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}
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Future<void> _autoDiscover() async {
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setState(() => _isSearching = true);
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final ip = await discoverServer();
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if (!mounted) return;
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if (ip != null) {
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_ipController.text = ip;
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_connectTo(ip);
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} else {
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setState(() => _isSearching = false);
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}
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}
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Future<void> _connectTo(String ip) async {
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if (_isConnecting) return;
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setState(() {
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_isConnecting = true;
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_isSearching = false;
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});
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try {
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_socket = await WebSocket.connect(
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'ws://$ip:$serverPort/stream',
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).timeout(const Duration(seconds: 5));
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_fpsTimer = Timer.periodic(const Duration(seconds: 1), (_) {
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if (!mounted) return;
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setState(() {
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_fps = _frameCount;
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_frameCount = 0;
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});
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});
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_socket!.listen(
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_onData,
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onDone: _onDisconnected,
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onError: (_) => _onDisconnected(),
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);
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setState(() {
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_isConnected = true;
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_isConnecting = false;
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});
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WakelockPlus.enable();
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} catch (error) {
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setState(() => _isConnecting = false);
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if (mounted) {
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ScaffoldMessenger.of(
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context,
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).showSnackBar(SnackBar(content: Text('Connection failed: $error')));
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}
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}
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}
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void _connect() {
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final ip = _ipController.text.trim();
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if (ip.isNotEmpty) _connectTo(ip);
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}
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void _onData(dynamic data) {
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if (data is List<int>) {
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setState(() {
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_currentFrame = Uint8List.fromList(data);
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_frameCount++;
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});
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} else if (data is String) {
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_handleState(data);
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}
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}
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void _handleState(String json) {
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try {
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final state = jsonDecode(json) as Map<String, dynamic>;
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setState(() {
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_cameraCount = state['cameras'] as int? ?? 0;
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_flashOn = state['flash'] as bool? ?? false;
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_lensDirection = state['lens'] as String? ?? '';
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_cameraName = state['name'] as String? ?? '';
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_zoom = (state['zoom'] as num?)?.toDouble() ?? 1.0;
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_minZoom = (state['minZoom'] as num?)?.toDouble() ?? 1.0;
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_maxZoom = (state['maxZoom'] as num?)?.toDouble() ?? 1.0;
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_quality = state['quality'] as int? ?? 50;
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});
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} catch (_) {}
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}
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void _sendCommand(String command) => _socket?.add(command);
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void _onDisconnected() {
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_fpsTimer?.cancel();
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_fpsTimer = null;
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if (!mounted) return;
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setState(() {
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_isConnected = false;
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_currentFrame = null;
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});
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WakelockPlus.disable();
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}
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void _disconnect() {
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_socket?.close();
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_onDisconnected();
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}
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void _cycleRotation() {
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setState(() => _rotation = (_rotation + 1) % 4);
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}
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@override
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void dispose() {
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_fpsTimer?.cancel();
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_socket?.close();
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_ipController.dispose();
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WakelockPlus.disable();
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SystemChrome.setPreferredOrientations(DeviceOrientation.values);
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SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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if (_isConnected) return _buildViewer();
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return _buildConnectScreen();
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}
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Widget _buildConnectScreen() {
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return Scaffold(
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appBar: AppBar(title: const Text('Viewer')),
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body: Center(
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child: Padding(
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padding: const EdgeInsets.all(32),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (_isSearching) ...[
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const CircularProgressIndicator(),
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const SizedBox(height: 16),
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const Text('Searching for camera...'),
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] else ...[
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TextField(
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controller: _ipController,
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decoration: const InputDecoration(
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labelText: 'Camera IP address',
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border: OutlineInputBorder(),
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),
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keyboardType: TextInputType.number,
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onSubmitted: (_) => _connect(),
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),
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const SizedBox(height: 16),
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Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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FilledButton.icon(
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onPressed: _isConnecting ? null : _connect,
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icon: _isConnecting
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? const SizedBox(
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width: 16,
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height: 16,
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child: CircularProgressIndicator(strokeWidth: 2),
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)
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: const Icon(Icons.play_arrow),
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label: Text(_isConnecting ? 'Connecting...' : 'Connect'),
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),
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const SizedBox(width: 16),
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OutlinedButton.icon(
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onPressed: _isConnecting ? null : _autoDiscover,
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icon: const Icon(Icons.search),
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label: const Text('Search'),
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),
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],
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),
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],
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],
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),
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),
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),
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);
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}
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Widget _buildViewer() {
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return Scaffold(
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backgroundColor: Colors.black,
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body: Stack(
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fit: StackFit.expand,
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children: [
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if (_currentFrame != null)
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Center(
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child: Transform.flip(
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flipX: _mirrored,
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child: RotatedBox(
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quarterTurns: _rotation,
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child: Image.memory(
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_currentFrame!,
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gaplessPlayback: true,
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fit: BoxFit.contain,
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),
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),
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),
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),
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_buildTopBar(),
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_buildBottomControls(),
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],
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),
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);
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}
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Widget _buildTopBar() {
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return Positioned(
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top: 16,
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right: 16,
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child: SafeArea(
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
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decoration: BoxDecoration(
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color: Colors.black54,
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borderRadius: BorderRadius.circular(8),
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),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.circle, color: Colors.green, size: 12),
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const SizedBox(width: 8),
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Text('$_fps fps'),
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if (_cameraName.isNotEmpty) ...[
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const SizedBox(width: 8),
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Text(
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'$_lensDirection $_cameraName',
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style: const TextStyle(fontSize: 12),
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),
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],
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],
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),
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),
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),
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);
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}
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List<double> get _availableZoomPresets {
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const presets = [0.5, 1.0, 2.0, 3.0, 5.0, 10.0];
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return presets.where((z) => z >= _minZoom && z <= _maxZoom).toList();
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}
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Widget _buildBottomControls() {
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return Positioned(
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bottom: 0,
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left: 0,
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right: 0,
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child: SafeArea(
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child: Container(
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padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 8),
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decoration: const BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.bottomCenter,
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end: Alignment.topCenter,
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colors: [Colors.black54, Colors.transparent],
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),
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),
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child: Row(
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children: [
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IconButton(
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onPressed: _disconnect,
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icon: const Icon(Icons.close, size: 20),
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visualDensity: VisualDensity.compact,
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),
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if (_cameraCount > 1)
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IconButton(
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onPressed: () => _sendCommand('switch_camera'),
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icon: const Icon(Icons.flip_camera_android, size: 20),
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visualDensity: VisualDensity.compact,
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),
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IconButton(
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onPressed: () => _sendCommand('toggle_flash'),
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icon: Icon(
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_flashOn ? Icons.flash_on : Icons.flash_off,
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size: 20,
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),
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visualDensity: VisualDensity.compact,
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),
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IconButton(
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onPressed: _cycleRotation,
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icon: const Icon(Icons.rotate_right, size: 20),
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visualDensity: VisualDensity.compact,
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),
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IconButton(
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onPressed: () => setState(() => _mirrored = !_mirrored),
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icon: const Icon(Icons.flip, size: 20),
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visualDensity: VisualDensity.compact,
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),
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const Spacer(),
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if (_availableZoomPresets.length > 1)
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..._buildChipGroup(
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_availableZoomPresets.map((level) {
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final active = (_zoom - level).abs() < 0.1;
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final label = level == level.roundToDouble()
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? '${level.toInt()}x'
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: '${level}x';
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return _chip(label, active, () => _sendCommand('zoom:$level'));
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}),
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),
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const SizedBox(width: 8),
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..._buildChipGroup(
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[30, 50, 70, 90].map(
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(q) => _chip('$q%', _quality == q, () => _sendCommand('quality:$q')),
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),
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),
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],
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),
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),
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),
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);
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}
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List<Widget> _buildChipGroup(Iterable<Widget> chips) => chips.toList();
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Widget _chip(String label, bool active, VoidCallback onTap) {
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return Padding(
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padding: const EdgeInsets.symmetric(horizontal: 2),
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child: GestureDetector(
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onTap: onTap,
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
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decoration: BoxDecoration(
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color: active ? Colors.white24 : Colors.transparent,
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: active ? Colors.white70 : Colors.white30,
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),
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),
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child: Text(
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label,
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style: TextStyle(
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fontSize: 11,
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color: active ? Colors.white : Colors.white70,
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),
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),
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),
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),
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);
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}
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}
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