audio_session 0.1.21 audio_session: ^0.1.21 copied to clipboard
Sets the iOS audio session category and Android audio attributes for your app, and manages your app's audio focus, mixing and ducking behaviour.
import 'dart:math';
import 'package:audio_session/audio_session.dart';
import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart' as ja;
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final _player = ja.AudioPlayer(
// Handle audio_session events ourselves for the purpose of this demo.
handleInterruptions: false,
androidApplyAudioAttributes: false,
handleAudioSessionActivation: false,
);
@override
void initState() {
super.initState();
AudioSession.instance.then((audioSession) async {
// This line configures the app's audio session, indicating to the OS the
// type of audio we intend to play. Using the "speech" recipe rather than
// "music" since we are playing a podcast.
await audioSession.configure(AudioSessionConfiguration.speech());
// Listen to audio interruptions and pause or duck as appropriate.
_handleInterruptions(audioSession);
// Use another plugin to load audio to play.
await _player.setUrl(
"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3");
});
}
void _handleInterruptions(AudioSession audioSession) {
// just_audio can handle interruptions for us, but we have disabled that in
// order to demonstrate manual configuration.
bool playInterrupted = false;
audioSession.becomingNoisyEventStream.listen((_) {
print('PAUSE');
_player.pause();
});
_player.playingStream.listen((playing) {
playInterrupted = false;
if (playing) {
audioSession.setActive(true);
}
});
audioSession.interruptionEventStream.listen((event) {
print('interruption begin: ${event.begin}');
print('interruption type: ${event.type}');
if (event.begin) {
switch (event.type) {
case AudioInterruptionType.duck:
if (audioSession.androidAudioAttributes!.usage ==
AndroidAudioUsage.game) {
_player.setVolume(_player.volume / 2);
}
playInterrupted = false;
break;
case AudioInterruptionType.pause:
case AudioInterruptionType.unknown:
if (_player.playing) {
_player.pause();
playInterrupted = true;
}
break;
}
} else {
switch (event.type) {
case AudioInterruptionType.duck:
_player.setVolume(min(1.0, _player.volume * 2));
playInterrupted = false;
break;
case AudioInterruptionType.pause:
if (playInterrupted) _player.play();
playInterrupted = false;
break;
case AudioInterruptionType.unknown:
playInterrupted = false;
break;
}
}
});
audioSession.devicesChangedEventStream.listen((event) {
print('Devices added: ${event.devicesAdded}');
print('Devices removed: ${event.devicesRemoved}');
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('audio_session example'),
),
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child: Center(
child: StreamBuilder<ja.PlayerState>(
stream: _player.playerStateStream,
builder: (context, snapshot) {
final playerState = snapshot.data;
if (playerState?.processingState !=
ja.ProcessingState.ready) {
return Container(
margin: EdgeInsets.all(8.0),
width: 64.0,
height: 64.0,
child: CircularProgressIndicator(),
);
} else if (playerState?.playing == true) {
return IconButton(
icon: Icon(Icons.pause),
iconSize: 64.0,
onPressed: _player.pause,
);
} else {
return IconButton(
icon: Icon(Icons.play_arrow),
iconSize: 64.0,
onPressed: _player.play,
);
}
},
),
),
),
Expanded(
child: FutureBuilder<AudioSession>(
future: AudioSession.instance,
builder: (context, snapshot) {
final session = snapshot.data;
if (session == null) return SizedBox();
return StreamBuilder<Set<AudioDevice>>(
stream: session.devicesStream,
builder: (context, snapshot) {
final devices = snapshot.data ?? {};
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text("Input devices",
style: Theme.of(context).textTheme.titleLarge),
for (var device
in devices.where((device) => device.isInput))
Text('${device.name} (${device.type.name})'),
SizedBox(height: 16),
Text("Output devices",
style: Theme.of(context).textTheme.titleLarge),
for (var device
in devices.where((device) => device.isOutput))
Text('${device.name} (${device.type.name})'),
],
);
},
);
},
),
),
],
),
),
),
);
}
}