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Description:

cast

cast #
Dart package to discover and connect with Chromecast devices
Installation #
Add this to your package's pubspec.yaml file:
dependencies:
cast: ^2.1.0
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iOS #
Required iOS 13 minimum.
Since iOS 14 a few more steps are required https://developers.google.com/cast/docs/ios_sender/ios_permissions_changes
In ios/Runner/Info.plist add:
<key>NSBonjourServices</key>
<array>
<string>_googlecast._tcp</string>
<string>_YOUR_APP_ID._googlecast._tcp</string>
</array>

<key>NSLocalNetworkUsageDescription</key>
<string>${PRODUCT_NAME} uses the local network to discover Cast-enabled devices on your WiFi
network.</string>
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Usage #
List devices:
Widget build(BuildContext context) {
return FutureBuilder<List<CastDevice>>(
future: CastDiscoveryService().search(),
builder: (context, snapshot) {
if (snapshot.hasError) {
return Center(
child: Text(
'Error: ${snapshot.error.toString()}',
),
);
} else if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(),
);
}

if (snapshot.data!.isEmpty) {
return Column(
children: [
Center(
child: Text(
'No Chromecast founded',
),
),
],
);
}

return Column(
children: snapshot.data!.map((device) {
return ListTile(
title: Text(device.name),
onTap: () {
_connectToYourApp(context, device);
},
);
}).toList(),
);
},
);
}
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Connect to device:
Future<void> _connect(BuildContext context, CastDevice object) async {
final session = await CastSessionManager().startSession(object);

session.stateStream.listen((state) {
if (state == CastSessionState.connected) {
_sendMessage(session);
}
});

session.messageStream.listen((message) {
print('receive message: $message');
});

session.sendMessage(CastSession.kNamespaceReceiver, {
'type': 'LAUNCH',
'appId': 'YouTube', // set the appId of your app here
});
}
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CastSessionManager is used to keep track of all sessions.
Send message:
void _sendMessage(CastSession session) {
session.sendMessage('urn:x-cast:namespace-of-the-app', {
'type': 'sample',
});
}
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Except for the launch message, you should wait until the session have a connected state before sending message.
Note #
Some informations about the protocol used https://docs.rs/crate/gcast/0.1.5/source/PROTOCOL.md
$ pub global activate protoc_plugin
$ export PATH="$PATH":"$HOME/.pub-cache/bin"
$ protoc -I=./lib/cast_channel --dart_out=./lib/cast_channel ./lib/cast_channel/cast_channel.proto --plugin "pub run protoc_plugin"
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Author #

Jonathan VUKOVICH