just_audio 0.7.4+1 
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ryanheise.comA feature-rich audio player for Flutter. Loop, clip and concatenate any sound from any source (asset/file/URL/stream) in a variety of audio formats with gapless playback.
import 'dart:math';
import 'package:audio_session/audio_session.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:just_audio/just_audio.dart';
import 'package:rxdart/rxdart.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late AudioPlayer _player;
final _playlist = ConcatenatingAudioSource(children: [
ClippingAudioSource(
start: Duration(seconds: 60),
end: Duration(seconds: 90),
child: AudioSource.uri(Uri.parse(
"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3")),
tag: AudioMetadata(
album: "Science Friday",
title: "A Salute To Head-Scratching Science (30 seconds)",
artwork:
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
),
),
AudioSource.uri(
Uri.parse(
"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3"),
tag: AudioMetadata(
album: "Science Friday",
title: "A Salute To Head-Scratching Science",
artwork:
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
),
),
AudioSource.uri(
Uri.parse("https://s3.amazonaws.com/scifri-segments/scifri201711241.mp3"),
tag: AudioMetadata(
album: "Science Friday",
title: "From Cat Rheology To Operatic Incompetence",
artwork:
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
),
),
AudioSource.uri(
Uri.parse("asset:///audio/nature.mp3"),
tag: AudioMetadata(
album: "Public Domain",
title: "Nature Sounds",
artwork:
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
),
),
]);
int _addedCount = 0;
@override
void initState() {
super.initState();
_player = AudioPlayer();
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
statusBarColor: Colors.black,
));
_init();
}
Future<void> _init() async {
final session = await AudioSession.instance;
await session.configure(AudioSessionConfiguration.speech());
// Listen to errors during playback.
_player.playbackEventStream.listen((event) {},
onError: (Object e, StackTrace stackTrace) {
print('A stream error occurred: $e');
});
try {
await _player.setAudioSource(_playlist);
} catch (e) {
// Catch load errors: 404, invalid url ...
print("Error loading playlist: $e");
}
}
@override
void dispose() {
_player.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
child: StreamBuilder<SequenceState?>(
stream: _player.sequenceStateStream,
builder: (context, snapshot) {
final state = snapshot.data;
if (state?.sequence.isEmpty ?? true) return SizedBox();
final metadata = state!.currentSource!.tag as AudioMetadata;
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child:
Center(child: Image.network(metadata.artwork)),
),
),
Text(metadata.album,
style: Theme.of(context).textTheme.headline6),
Text(metadata.title),
],
);
},
),
),
ControlButtons(_player),
StreamBuilder<Duration?>(
stream: _player.durationStream,
builder: (context, snapshot) {
final duration = snapshot.data ?? Duration.zero;
return StreamBuilder<PositionData>(
stream: Rx.combineLatest2<Duration, Duration, PositionData>(
_player.positionStream,
_player.bufferedPositionStream,
(position, bufferedPosition) =>
PositionData(position, bufferedPosition)),
builder: (context, snapshot) {
final positionData = snapshot.data ??
PositionData(Duration.zero, Duration.zero);
var position = positionData.position;
if (position > duration) {
position = duration;
}
var bufferedPosition = positionData.bufferedPosition;
if (bufferedPosition > duration) {
bufferedPosition = duration;
}
return SeekBar(
duration: duration,
position: position,
bufferedPosition: bufferedPosition,
onChangeEnd: (newPosition) {
_player.seek(newPosition);
},
);
},
);
},
),
SizedBox(height: 8.0),
Row(
children: [
StreamBuilder<LoopMode>(
stream: _player.loopModeStream,
builder: (context, snapshot) {
final loopMode = snapshot.data ?? LoopMode.off;
const icons = [
Icon(Icons.repeat, color: Colors.grey),
Icon(Icons.repeat, color: Colors.orange),
Icon(Icons.repeat_one, color: Colors.orange),
];
const cycleModes = [
LoopMode.off,
LoopMode.all,
LoopMode.one,
];
final index = cycleModes.indexOf(loopMode);
return IconButton(
icon: icons[index],
onPressed: () {
_player.setLoopMode(cycleModes[
(cycleModes.indexOf(loopMode) + 1) %
cycleModes.length]);
},
);
},
),
Expanded(
child: Text(
"Playlist",
style: Theme.of(context).textTheme.headline6,
textAlign: TextAlign.center,
),
),
StreamBuilder<bool>(
stream: _player.shuffleModeEnabledStream,
builder: (context, snapshot) {
final shuffleModeEnabled = snapshot.data ?? false;
return IconButton(
icon: shuffleModeEnabled
? Icon(Icons.shuffle, color: Colors.orange)
: Icon(Icons.shuffle, color: Colors.grey),
onPressed: () async {
final enable = !shuffleModeEnabled;
if (enable) {
await _player.shuffle();
}
await _player.setShuffleModeEnabled(enable);
},
);
},
),
],
),
Container(
height: 240.0,
child: StreamBuilder<SequenceState?>(
stream: _player.sequenceStateStream,
builder: (context, snapshot) {
final state = snapshot.data;
final sequence = state?.sequence ?? [];
return ReorderableListView(
onReorder: (int oldIndex, int newIndex) {
if (oldIndex < newIndex) newIndex--;
_playlist.move(oldIndex, newIndex);
},
children: [
for (var i = 0; i < sequence.length; i++)
Dismissible(
key: ValueKey(sequence[i]),
background: Container(
color: Colors.redAccent,
alignment: Alignment.centerRight,
child: Padding(
padding: const EdgeInsets.only(right: 8.0),
child: Icon(Icons.delete, color: Colors.white),
),
),
onDismissed: (dismissDirection) {
_playlist.removeAt(i);
},
child: Material(
color: i == state!.currentIndex
? Colors.grey.shade300
: null,
child: ListTile(
title: Text(sequence[i].tag.title as String),
onTap: () {
_player.seek(Duration.zero, index: i);
},
),
),
),
],
);
},
),
),
],
),
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
_playlist.add(AudioSource.uri(
Uri.parse("asset:///audio/nature.mp3"),
tag: AudioMetadata(
album: "Public Domain",
title: "Nature Sounds ${++_addedCount}",
artwork:
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
),
));
},
),
),
);
}
}
class ControlButtons extends StatelessWidget {
final AudioPlayer player;
ControlButtons(this.player);
@override
Widget build(BuildContext context) {
return Row(
mainAxisSize: MainAxisSize.min,
children: [
IconButton(
icon: Icon(Icons.volume_up),
onPressed: () {
_showSliderDialog(
context: context,
title: "Adjust volume",
divisions: 10,
min: 0.0,
max: 1.0,
stream: player.volumeStream,
onChanged: player.setVolume,
);
},
),
StreamBuilder<SequenceState?>(
stream: player.sequenceStateStream,
builder: (context, snapshot) => IconButton(
icon: Icon(Icons.skip_previous),
onPressed: player.hasPrevious ? player.seekToPrevious : null,
),
),
StreamBuilder<PlayerState>(
stream: player.playerStateStream,
builder: (context, snapshot) {
final playerState = snapshot.data;
final processingState = playerState?.processingState;
final playing = playerState?.playing;
if (processingState == ProcessingState.loading ||
processingState == ProcessingState.buffering) {
return Container(
margin: EdgeInsets.all(8.0),
width: 64.0,
height: 64.0,
child: CircularProgressIndicator(),
);
} else if (playing != true) {
return IconButton(
icon: Icon(Icons.play_arrow),
iconSize: 64.0,
onPressed: player.play,
);
} else if (processingState != ProcessingState.completed) {
return IconButton(
icon: Icon(Icons.pause),
iconSize: 64.0,
onPressed: player.pause,
);
} else {
return IconButton(
icon: Icon(Icons.replay),
iconSize: 64.0,
onPressed: () => player.seek(Duration.zero,
index: player.effectiveIndices!.first),
);
}
},
),
StreamBuilder<SequenceState?>(
stream: player.sequenceStateStream,
builder: (context, snapshot) => IconButton(
icon: Icon(Icons.skip_next),
onPressed: player.hasNext ? player.seekToNext : null,
),
),
StreamBuilder<double>(
stream: player.speedStream,
builder: (context, snapshot) => IconButton(
icon: Text("${snapshot.data?.toStringAsFixed(1)}x",
style: TextStyle(fontWeight: FontWeight.bold)),
onPressed: () {
_showSliderDialog(
context: context,
title: "Adjust speed",
divisions: 10,
min: 0.5,
max: 1.5,
stream: player.speedStream,
onChanged: player.setSpeed,
);
},
),
),
],
);
}
}
class SeekBar extends StatefulWidget {
final Duration duration;
final Duration position;
final Duration bufferedPosition;
final ValueChanged<Duration>? onChanged;
final ValueChanged<Duration>? onChangeEnd;
SeekBar({
required this.duration,
required this.position,
required this.bufferedPosition,
this.onChanged,
this.onChangeEnd,
});
@override
_SeekBarState createState() => _SeekBarState();
}
class _SeekBarState extends State<SeekBar> {
double? _dragValue;
late SliderThemeData _sliderThemeData;
@override
void didChangeDependencies() {
super.didChangeDependencies();
_sliderThemeData = SliderTheme.of(context).copyWith(
trackHeight: 2.0,
);
}
@override
Widget build(BuildContext context) {
return Stack(
children: [
SliderTheme(
data: _sliderThemeData.copyWith(
thumbShape: HiddenThumbComponentShape(),
activeTrackColor: Colors.blue.shade100,
inactiveTrackColor: Colors.grey.shade300,
),
child: ExcludeSemantics(
child: Slider(
min: 0.0,
max: widget.duration.inMilliseconds.toDouble(),
value: widget.bufferedPosition.inMilliseconds.toDouble(),
onChanged: (value) {
setState(() {
_dragValue = value;
});
if (widget.onChanged != null) {
widget.onChanged!(Duration(milliseconds: value.round()));
}
},
onChangeEnd: (value) {
if (widget.onChangeEnd != null) {
widget.onChangeEnd!(Duration(milliseconds: value.round()));
}
_dragValue = null;
},
),
),
),
SliderTheme(
data: _sliderThemeData.copyWith(
inactiveTrackColor: Colors.transparent,
),
child: Slider(
min: 0.0,
max: widget.duration.inMilliseconds.toDouble(),
value: min(_dragValue ?? widget.position.inMilliseconds.toDouble(),
widget.duration.inMilliseconds.toDouble()),
onChanged: (value) {
setState(() {
_dragValue = value;
});
if (widget.onChanged != null) {
widget.onChanged!(Duration(milliseconds: value.round()));
}
},
onChangeEnd: (value) {
if (widget.onChangeEnd != null) {
widget.onChangeEnd!(Duration(milliseconds: value.round()));
}
_dragValue = null;
},
),
),
Positioned(
right: 16.0,
bottom: 0.0,
child: Text(
RegExp(r'((^0*[1-9]\d*:)?\d{2}:\d{2})\.\d+$')
.firstMatch("$_remaining")
?.group(1) ??
'$_remaining',
style: Theme.of(context).textTheme.caption),
),
],
);
}
Duration get _remaining => widget.duration - widget.position;
}
void _showSliderDialog({
required BuildContext context,
required String title,
required int divisions,
required double min,
required double max,
String valueSuffix = '',
required Stream<double> stream,
required ValueChanged<double> onChanged,
}) {
showDialog<void>(
context: context,
builder: (context) => AlertDialog(
title: Text(title, textAlign: TextAlign.center),
content: StreamBuilder<double>(
stream: stream,
builder: (context, snapshot) => Container(
height: 100.0,
child: Column(
children: [
Text('${snapshot.data?.toStringAsFixed(1)}$valueSuffix',
style: TextStyle(
fontFamily: 'Fixed',
fontWeight: FontWeight.bold,
fontSize: 24.0)),
Slider(
divisions: divisions,
min: min,
max: max,
value: snapshot.data ?? 1.0,
onChanged: onChanged,
),
],
),
),
),
),
);
}
class AudioMetadata {
final String album;
final String title;
final String artwork;
AudioMetadata(
{required this.album, required this.title, required this.artwork});
}
class HiddenThumbComponentShape extends SliderComponentShape {
@override
Size getPreferredSize(bool isEnabled, bool isDiscrete) => Size.zero;
@override
void paint(
PaintingContext context,
Offset center, {
required Animation<double> activationAnimation,
required Animation<double> enableAnimation,
required bool isDiscrete,
required TextPainter labelPainter,
required RenderBox parentBox,
required SliderThemeData sliderTheme,
required TextDirection textDirection,
required double value,
required double textScaleFactor,
required Size sizeWithOverflow,
}) {}
}
class PositionData {
final Duration position;
final Duration bufferedPosition;
PositionData(this.position, this.bufferedPosition);
}Metadata
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Publisher
Metadata
A feature-rich audio player for Flutter. Loop, clip and concatenate any sound from any source (asset/file/URL/stream) in a variety of audio formats with gapless playback.
Homepage
Repository (GitHub)
View/report issues
License
unknown (LICENSE)
Dependencies
async, audio_session, crypto, flutter, just_audio_platform_interface, just_audio_web, meta, path, path_provider, rxdart, uuid
