Skip to content

Fixed Dart assumes Big-endian order #20

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
akshaynarisetti merged 1 commit into from
Apr 5, 2024
Merged

Fixed Dart assumes Big-endian order #20

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 13 additions & 9 deletions AppWithWearable/lib/custom_code/actions/ble_receive_w_a_v.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ import 'package:flutter_blue_plus/flutter_blue_plus.dart';
import 'dart:typed_data';
import 'dart:async';

const int sampleRate = 4000;
const int sampleRate = 8000;
const int channelCount = 1;
const int sampleWidth = 2; // 2 bytes for 16-bit samples
const int chunkSize = 200;
Expand Down Expand Up @@ -55,30 +55,34 @@ Future<FFUploadedFile?> bleReceiveWAV(
await characteristic.setNotifyValue(true);
print('Subscribed to characteristic: ${characteristic.uuid}');
List<int> wavData = [];
int samplesToRead = 40000;
int samplesToRead = 150000;

characteristic.value.listen((value) {

value.removeRange(0, 3);
print('values -- ${value[0]}, ${value[1]}');
// Interpret bytes as Uint16 directly

// Interpret bytes as Int16 directly
for (int i = 0; i < value.length; i += 2) {
int byte1 = value[i];
int byte2 = value[i + 1];
int uint16Value = (byte1 << 8) | byte2;
wavData.add(uint16Value);

print('$uint16Value');
int int16Value = (byte2 << 8) | byte1;
wavData.add(int16Value);
print('$int16Value');
}

print(
'Received ------ ${value.length ~/ 2} samples, total: ${wavData.length}/$samplesToRead');
if (wavData.length >= samplesToRead && !completer.isCompleted) {
print('Received desired amount of data');
characteristic.setNotifyValue(false);
completer.complete(createWavFile(wavData));
completer.complete(createWavFile(wavData));

} else {
print('Still need ${samplesToRead - wavData.length} samples');
}
});
});

// Wait for the desired duration
final waitSeconds = recordDuration + 20;
Expand Down