115 lines
3.2 KiB
Dart
115 lines
3.2 KiB
Dart
part of '../../main.dart';
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class CameraControlsWidget extends StatefulWidget {
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final String url;
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CameraControlsWidget({Key key, @required this.url}) : super(key: key);
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@override
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_CameraControlsWidgetState createState() => _CameraControlsWidgetState();
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}
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class _CameraControlsWidgetState extends State<CameraControlsWidget> {
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@override
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void initState() {
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super.initState();
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_getData();
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}
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http.Client client;
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http.StreamedResponse response;
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List<int> binaryImage = [];
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String cameraState = "Connecting...";
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bool timeToStop = false;
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Completer streamCompleter;
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void _getData() async {
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client = new http.Client(); // create a client to make api calls
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http.Request request = new http.Request("GET", Uri.parse(widget.url)); // create get request
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Logger.d("[Sending] ==> ${widget.url}");
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response = await client.send(request);
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setState(() {
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cameraState = "Starting...";
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});
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Logger.d("[Received] <== ${response.headers}");
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List<int> primaryBuffer=[];
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final int imageSizeStart = 59;
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int imageSizeEnd = 0;
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int imageStart = 0;
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int imageSize = 0;
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String strBuffer = "";
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streamCompleter = Completer();
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response.stream.transform(
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StreamTransformer.fromHandlers(
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handleData: (data, sink) {
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primaryBuffer.addAll(data);
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if (primaryBuffer.length >= 66) {
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for (int i = imageSizeStart; i < primaryBuffer.length - 4; i++) {
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strBuffer = utf8.decode(
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primaryBuffer.sublist(i, i + 4), allowMalformed: true);
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if (strBuffer == "\r\n\r\n") {
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imageSizeEnd = i;
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imageStart = i + 4;
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break;
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}
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}
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imageSize = int.tryParse(utf8.decode(
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primaryBuffer.sublist(imageSizeStart, imageSizeEnd),
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allowMalformed: true));
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if (imageSize != null && primaryBuffer.length >= imageStart + imageSize + 2) {
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sink.add(
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primaryBuffer.sublist(imageStart, imageStart + imageSize));
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primaryBuffer.removeRange(0, imageStart + imageSize + 2);
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}
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}
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if (timeToStop) {
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sink?.close();
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streamCompleter.complete();
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}
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},
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handleError: (error, stack, sink) {
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Logger.e("Error parsing MJPEG stream: $error");
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},
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handleDone: (sink) {
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sink?.close();
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},
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)
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).listen((d) {
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setState(() {
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binaryImage = d;
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});
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});
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}
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@override
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Widget build(BuildContext context) {
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if (binaryImage.isEmpty) {
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return Column(
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children: <Widget>[
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Text("$cameraState")
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],
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);
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} else {
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return Column(
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children: <Widget>[
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Image.memory(Uint8List.fromList(binaryImage), gaplessPlayback: true),
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],
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);
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}
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}
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@override
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void dispose() {
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super.dispose();
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timeToStop = true;
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if (streamCompleter != null && !streamCompleter.isCompleted) {
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streamCompleter.future.then((_) {
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client?.close();
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});
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} else {
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client?.close();
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}
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}
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} |