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switch audio outputs functionality #156

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1e98ad9
switch audio outputs functionality
zombie6888 Apr 3, 2025
85f0826
force to use communication mode when switching to speaker on android …
zombie6888 May 12, 2025
e4f97b8
review fixes
zombie6888 May 17, 2025
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3 changes: 2 additions & 1 deletion example/android/app/src/main/AndroidManifest.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -41,5 +41,6 @@
<action android:name="android.intent.action.PROCESS_TEXT"/>
<data android:mimeType="text/plain"/>
</intent>
</queries>
</queries>
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
</manifest>
207 changes: 207 additions & 0 deletions example/lib/audio_switcher.dart
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Original file line number Diff line number Diff line change
@@ -0,0 +1,207 @@
import 'dart:io';

import 'package:audio_session/audio_session.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

class AudioSwitcher extends StatefulWidget {
final AudioSession session;
const AudioSwitcher({super.key, required this.session});

@override
State<AudioSwitcher> createState() => _AudioSwitcherState();
}

class _AudioSwitcherState extends State<AudioSwitcher> {
Set<OutputAudioDevice> _outputs = {};
OutputAudioDevice? _currentOutput;

final _btTypes = [
AndroidAudioDeviceType.bluetoothA2dp,
AndroidAudioDeviceType.bluetoothSco,
];
final _speakerTypes = [
AndroidAudioDeviceType.builtInSpeaker,
AndroidAudioDeviceType.builtInSpeakerSafe,
];

@override
void initState() {
super.initState();
if (Platform.isIOS) {
_updateIosDevices();
} else {
_updateAndroidDevices();
}
}

T? _firstWhereOrNull<T>(Iterable<T> iterable, bool Function(T element) test) {
for (var element in iterable) {
if (test(element)) return element;
}
return null;
}

String getOutputDeviceName(OutputAudioDevice device) {
switch (device) {
case Bluetooth _:
return 'bluetooth (${device.label})';
case Earpiece _:
return 'telephony';
case Speaker _:
return 'speaker';
}
}

Future<void> changeOutputDevice(OutputAudioDevice device) async {
final session = widget.session;
switch (device) {
case Bluetooth _:
session.switchToBluetooth();
_currentOutput = Bluetooth(device.label);
case Earpiece _:
session.switchToReceiver();
_currentOutput = Earpiece();
case Speaker _:
session.switchToSpeaker();
_currentOutput = Speaker();
}
setState(() {});
}

IconData getOutputDeviceIcon(OutputAudioDevice device) {
switch (device) {
case Bluetooth _:
return Icons.bluetooth_audio;
case Earpiece _:
return Icons.phone;
case Speaker _:
return Icons.speaker;
}
}

Future<void> _updateIosDevices() async {
final avAudioSession = !kIsWeb && Platform.isIOS ? AVAudioSession() : null;
final currentRoute = await avAudioSession?.currentRoute;
if (currentRoute != null) {
_outputs.add(Speaker());
final availableInputs = await avAudioSession!.availableInputs;
final currentOutputs = currentRoute.outputs;
final currentOutput = currentOutputs.first;
final bluetoothTypes = {
AVAudioSessionPort.bluetoothLe,
AVAudioSessionPort.bluetoothHfp,
AVAudioSessionPort.bluetoothA2dp,
};
if (currentOutput.portType == AVAudioSessionPort.builtInReceiver) {
_currentOutput = Earpiece();
} else if (bluetoothTypes.contains(currentOutput.portType)) {
_currentOutput = Bluetooth(currentOutput.portName);
} else if (currentOutput.portType == AVAudioSessionPort.builtInSpeaker) {
_currentOutput = Speaker();
}
final inputTypes = availableInputs.map((i) => i.portType);
final hasBuiltIn = inputTypes.contains(AVAudioSessionPort.builtInMic);
final bluetoothDevice = _firstWhereOrNull(
availableInputs,
(i) => bluetoothTypes.contains(i.portType),
);
var btDevice =
bluetoothDevice != null ? Bluetooth(bluetoothDevice.portName) : null;
if (btDevice == null && _currentOutput is Bluetooth) {
btDevice = _currentOutput! as Bluetooth;
}
_outputs = {
Speaker(),
if (btDevice != null) btDevice,
if (hasBuiltIn) Earpiece(),
};
}
setState(() {});
}

Future<void> _updateAndroidDevices() async {
final androidAudioManager =
!kIsWeb && Platform.isAndroid ? AndroidAudioManager() : null;
final androidDevices = await androidAudioManager!.getDevices(
AndroidGetAudioDevicesFlags.outputs,
);
final types = androidDevices.map((d) => d.type);
final hasSpeakerPhone = types.any(_speakerTypes.contains);
final hasEarpiece =
types.any((t) => t == AndroidAudioDeviceType.builtInEarpiece);
final blutoothDevice = _firstWhereOrNull(
androidDevices,
(d) => _btTypes.contains(d.type),
);
_outputs = {
if (hasSpeakerPhone) Speaker(),
if (blutoothDevice != null) Bluetooth(blutoothDevice.productName),
if (hasEarpiece) Earpiece(),
};
setState(() {});
}

@override
Widget build(BuildContext context) {
final currentDevice = _currentOutput;
final currentDeviceName =
currentDevice != null ? getOutputDeviceName(currentDevice) : '';

return Column(
children: [
Text("Switch devices: $currentDeviceName",
style: Theme.of(context).textTheme.titleLarge),
Column(
mainAxisSize: MainAxisSize.min,
children: [
for (var device in _outputs)
Row(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text(getOutputDeviceName(device)),
IconButton(
visualDensity: VisualDensity.compact,
padding: EdgeInsets.zero,
onPressed: () => changeOutputDevice(device),
icon: Icon(getOutputDeviceIcon(device)))
],
),
],
)
],
);
}
}

sealed class OutputAudioDevice {}

@immutable
class Speaker extends OutputAudioDevice {
@override
bool operator ==(Object other) => other is Speaker;

@override
int get hashCode => 'speaker'.hashCode;
}

@immutable
class Earpiece extends OutputAudioDevice {
@override
bool operator ==(Object other) => other is Earpiece;

@override
int get hashCode => 'earpiece'.hashCode;
}

@immutable
class Bluetooth extends OutputAudioDevice {
Bluetooth(this.label);
final String label;
@override
bool operator ==(Object other) => other is Bluetooth;

@override
int get hashCode => 'bluetooth'.hashCode;
}
130 changes: 64 additions & 66 deletions example/lib/main.dart
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import 'dart:math';

import 'package:audio_session/audio_session.dart';
import 'package:audio_session_example/audio_switcher.dart';
import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart' as ja;

Expand Down Expand Up @@ -103,72 +104,69 @@ class _MyAppState extends State<MyApp> {
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})'),
],
);
},
);
},
),
),
],
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(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.center,
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(
padding: EdgeInsets.zero,
icon: Icon(Icons.pause),
iconSize: 64.0,
onPressed: _player.pause,
);
} else {
return IconButton(
padding: EdgeInsets.zero,
icon: Icon(Icons.play_arrow),
iconSize: 64.0,
onPressed: _player.play,
);
}
},
),
),
),
AudioSwitcher(session: session),
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})'),
],
);
},
);
},
),
),
),
Expand Down
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