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Resolves #143 Camera support

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This commit is contained in:
Yegor Vialov
2019-02-09 02:12:05 +02:00
parent 8814687be6
commit fead6ea348
1 changed files with 38 additions and 21 deletions
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59
lib/entity_widgets/controls/camera_controls.dart
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@ -21,53 +21,59 @@ class _CameraControlsWidgetState extends State<CameraControlsWidget> {
http.Client client;
http.StreamedResponse response;
List<int> binaryImage = [];
String cameraState = "Connecting...";
bool timeToStop = false;
Completer streamCompleter;
void _getData() async {
client = new http.Client(); // create a client to make api calls
http.Request request = new http.Request("GET", Uri.parse(widget.url)); // create get request
Logger.d("[Sending] ==> ${widget.url}");
response = await client.send(request); // sends request and waits for response stream
response = await client.send(request);
setState(() {
cameraState = "Starting...";
});
Logger.d("[Received] <== ${response.headers}");
List<int> primaryBuffer=[];
int imageSizeStart = 0;
final int imageSizeStart = 59;
int imageSizeEnd = 0;
int imageStart = 0;
int imageSize = 0;
String strBuffer = "";
streamCompleter = Completer();
response.stream.transform(
StreamTransformer.fromHandlers(
handleData: (data, sink) {
primaryBuffer.addAll(data);
if (primaryBuffer.length >= 40) {
for (int i = 15; i < primaryBuffer.length - 16; i++) {
String tmp1 = utf8.decode(
primaryBuffer.sublist(i, i + 16), allowMalformed: true);
if (tmp1 == "Content-Length: ") {
imageSizeStart = i + 16;
break;
}
}
if (primaryBuffer.length >= 66) {
for (int i = imageSizeStart; i < primaryBuffer.length - 4; i++) {
String tmp1 = utf8.decode(
strBuffer = utf8.decode(
primaryBuffer.sublist(i, i + 4), allowMalformed: true);
if (tmp1 == "\r\n\r\n") {
if (strBuffer == "\r\n\r\n") {
imageSizeEnd = i;
imageStart = i + 4;
break;
}
}
int imageSize = int.tryParse(utf8.decode(
imageSize = int.tryParse(utf8.decode(
primaryBuffer.sublist(imageSizeStart, imageSizeEnd),
allowMalformed: true));
//Logger.d("== imageSize=$imageSize");
if (primaryBuffer.length >= imageStart + imageSize) {
if (imageSize != null && primaryBuffer.length >= imageStart + imageSize + 2) {
sink.add(
primaryBuffer.sublist(imageStart, imageStart + imageSize));
primaryBuffer = primaryBuffer.sublist(imageStart + imageSize);
primaryBuffer.removeRange(0, imageStart + imageSize + 2);
}
}
if (timeToStop) {
sink?.close();
streamCompleter.complete();
}
},
handleError: (error, stack, sink) {
Logger.e("Error parsing MJPEG stream: $error");
},
handleError: (error, stack, sink) {},
handleDone: (sink) {
sink.close();
sink?.close();
},
)
).listen((d) {
@ -80,7 +86,11 @@ class _CameraControlsWidgetState extends State<CameraControlsWidget> {
@override
Widget build(BuildContext context) {
if (binaryImage.isEmpty) {
return Text("Loading...");
return Column(
children: <Widget>[
Text("$cameraState")
],
);
} else {
return Column(
children: <Widget>[
@ -92,7 +102,14 @@ class _CameraControlsWidgetState extends State<CameraControlsWidget> {
@override
void dispose() {
client.close();
super.dispose();
timeToStop = true;
if (streamCompleter != null && !streamCompleter.isCompleted) {
streamCompleter.future.then((_) {
client?.close();
});
} else {
client?.close();
}
}
}