flutter_waveform

Description:

flutter waveform

Waveform #
A Flutter package to display a dynamic audio waveform that changes based on the audio amplitude. Ideal for visualizing audio input and providing real-time feedback in audio recording applications.
Features #

Real-time waveform display based on audio amplitude
Customizable appearance
Smooth transitions between amplitude points
Supports both silence detection and active audio display

Getting started #
Prerequisites #
Ensure you have the following:

Flutter SDK
Permissions for microphone access (for audio input)

Installation #
Add the following to your pubspec.yaml:
dependencies:
waveform: latest

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import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:record/record.dart';
import 'dart:async';
import 'waveform_painter.dart'; // Ensure this path is correct

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text('Waveform Example')),
body: WaveformWidget(),
),
);
}
}

class WaveformWidget extends StatefulWidget {
@override
_WaveformWidgetState createState() => _WaveformWidgetState();
}

class _WaveformWidgetState extends State<WaveformWidget> {
final Record _record = Record();
bool _isRecording = false;
Timer? _timer;
List<double> amplitudes = List.generate(100, (index) => 0.0);
double _threshold = -40.0;

@override
void initState() {
super.initState();
_requestPermissions();
}

Future<void> _requestPermissions() async {
await Permission.microphone.request();
}

void _startRecording() async {
if (await _record.hasPermission()) {
await _record.start();
setState(() {
_isRecording = true;
});
_startAmplitudeDetection();
}
}

void _stopRecording() async {
await _record.stop();
setState(() {
_isRecording = false;
});
_timer?.cancel();
}

void _startAmplitudeDetection() {
_timer = Timer.periodic(Duration(milliseconds: 100), (timer) async {
final amplitude = await _record.getAmplitude();
double value = (amplitude?.current ?? 0);
if (value < _threshold) {
value = 0; // Silence is a straight line
} else {
value = amplitude!.current.abs();
}

setState(() {
amplitudes.removeAt(0);
amplitudes.add(value);
});
});
}

@override
void dispose() {
_timer?.cancel();
_record.dispose();
super.dispose();
}

@override
Widget build(BuildContext context) {
return Center(
child: CustomPaint(
painter: WaveformPainter(amplitudes: amplitudes),
child: Container(
width: double.infinity,
height: 200,
),
),
);
}
}


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screen #