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Merge pull request #137 from alnitak/feat_waveform
Read samples from audio
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| import 'dart:developer' as dev; | ||
| import 'dart:io'; | ||
|
|
||
| import 'package:file_picker/file_picker.dart'; | ||
| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_soloud/flutter_soloud.dart'; | ||
| import 'package:logging/logging.dart'; | ||
|
|
||
| void main() async { | ||
| // The `flutter_soloud` package logs everything | ||
| // (from severe warnings to fine debug messages) | ||
| // using the standard `package:logging`. | ||
| // You can listen to the logs as shown below. | ||
| Logger.root.level = kDebugMode ? Level.FINE : Level.INFO; | ||
| Logger.root.onRecord.listen((record) { | ||
| dev.log( | ||
| record.message, | ||
| time: record.time, | ||
| level: record.level.value, | ||
| name: record.loggerName, | ||
| zone: record.zone, | ||
| error: record.error, | ||
| stackTrace: record.stackTrace, | ||
| ); | ||
| }); | ||
|
|
||
| WidgetsFlutterBinding.ensureInitialized(); | ||
|
|
||
| /// Initialize the player. | ||
| await SoLoud.instance.init(); | ||
|
|
||
| runApp( | ||
| const MaterialApp( | ||
| home: HelloFlutterSoLoud(), | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| /// Simple usecase of flutter_soloud plugin | ||
| class HelloFlutterSoLoud extends StatefulWidget { | ||
| const HelloFlutterSoLoud({super.key}); | ||
|
|
||
| @override | ||
| State<HelloFlutterSoLoud> createState() => _HelloFlutterSoLoudState(); | ||
| } | ||
|
|
||
| class _HelloFlutterSoLoudState extends State<HelloFlutterSoLoud> { | ||
| List<PlatformFile>? paths; | ||
| AudioSource? currentSound; | ||
| Float32List? data; | ||
| bool average = false; | ||
|
|
||
| @override | ||
| void dispose() { | ||
| SoLoud.instance.deinit(); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| if (!SoLoud.instance.isInitialized) return const SizedBox.shrink(); | ||
|
|
||
| final width = MediaQuery.sizeOf(context).width.toInt(); | ||
| return Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| children: [ | ||
| const SizedBox(height: 16), | ||
| const Text( | ||
| 'Read N audio samples (here N = width) from audio file.', | ||
| ), | ||
| OutlinedButton( | ||
| onPressed: () async { | ||
| paths = (await FilePicker.platform.pickFiles( | ||
| type: FileType.custom, | ||
| allowedExtensions: ['mp3', 'wav', 'flac'], | ||
| onFileLoading: print, | ||
| dialogTitle: 'Pick audio file', | ||
| )) | ||
| ?.files; | ||
|
|
||
| await _loadPath(width); | ||
| if (context.mounted) setState(() {}); | ||
| }, | ||
| child: const Text('pickFile'), | ||
| ), | ||
| Row( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| const Text('Average samples '), | ||
| Switch( | ||
| value: average, | ||
| onChanged: (value) async { | ||
| average = value; | ||
| await _loadPath(width); | ||
| if (context.mounted) setState(() {}); | ||
| }, | ||
| ), | ||
| ], | ||
| ), | ||
| if (data != null) | ||
| Expanded( | ||
| child: Container( | ||
| color: Colors.black, | ||
| width: width.toDouble(), | ||
| child: RepaintBoundary( | ||
| child: ClipRRect( | ||
| child: CustomPaint( | ||
| key: UniqueKey(), | ||
| painter: WavePainter( | ||
| data: data!, | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| Future<void> _loadPath(int width) async { | ||
| if (paths != null) { | ||
| if (kIsWeb) { | ||
| // on web we can't read the bytes from the file. | ||
| data = await SoLoud.instance.readSamplesFromMem( | ||
| paths!.first.bytes!, | ||
| width * 4, | ||
| average: average, | ||
| ); | ||
| } else { | ||
| final f = File(paths!.first.path!); | ||
| final bytes = f.readAsBytesSync(); | ||
| data = await SoLoud.instance.readSamplesFromMem( | ||
| bytes, | ||
| width * 4, | ||
| average: average, | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Custom painter to draw the wave data. | ||
| class WavePainter extends CustomPainter { | ||
| const WavePainter({ | ||
| required this.data, | ||
| }); | ||
|
|
||
| final Float32List data; | ||
|
|
||
| @override | ||
| void paint(Canvas canvas, Size size) { | ||
| final barWidth = size.width / data.length; | ||
| final paint = Paint() | ||
| ..color = Colors.yellowAccent | ||
| ..strokeWidth = barWidth; | ||
|
|
||
| for (var i = 0; i < data.length; i++) { | ||
| final barHeight = size.height * data[i] * 2; | ||
| canvas.drawLine( | ||
| Offset(barWidth * i, (size.height - barHeight) / 2), | ||
| Offset(barWidth * i, (size.height + barHeight) / 2), | ||
| paint, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| @override | ||
| bool shouldRepaint(WavePainter oldDelegate) { | ||
| return true; | ||
| } | ||
| } |
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