Audio file not playing through platform channel - flutter

Question

I'm trying to play an audio file on iOS with custom written platform channel. I have no errors when trying to play it, but I can't hear any sound from the phone/simulator.
When I try just_audio everything works great, so the problem is not about file path. You can test the commented method of playing it with just_audio. But when I try to play it through the platform channel, I can't hear any sound
This is my AppDelegate.swift:
import UIKit
import Flutter
import AVFoundation
#UIApplicationMain
#objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
let playerChannel = FlutterMethodChannel(name: "PlayerChannel",
binaryMessenger: controller.binaryMessenger)
playerChannel.setMethodCallHandler({
[weak self] (call: FlutterMethodCall, result: FlutterResult) -> Void in
// This method is invoked on the UI thread.
guard call.method == "play" else {
result(FlutterMethodNotImplemented)
return
}
guard let args = call.arguments as? [String : Any] else {return}
let text = args["path"] as! String
self?.playAudio(result: result, path: text)
})
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
private func playAudio(result: FlutterResult, path: String) {
do{
let audioData = try Data.init(contentsOf:URL(fileURLWithPath: path))
try AVAudioSession.sharedInstance().setMode(.default)
try AVAudioSession.sharedInstance().setActive(true)
let audioPlayer = try AVAudioPlayer.init(data: audioData)
audioPlayer.play()
} catch {
print(String(describing: error))
result(FlutterError(code: "UNAVAILABLE",
message: "error.",
details: nil))
}
}
}
And this is how I call this method from my dart file:
import 'dart:developer';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:just_audio/just_audio.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({super.key});
#override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
static const platform = MethodChannel('PlayerChannel');
Future<String> getPath() async {
Directory tempDir = await getTemporaryDirectory();
String tempPath = tempDir.path;
var filePath = "$tempPath/brown_noise.mp3";
var file = File(filePath);
if (file.existsSync()) {
return file.path;
} else {
final byteData = await rootBundle.load('assets/brown_noise.mp3');
final buffer = byteData.buffer;
await file.create(recursive: true);
file.writeAsBytes(
buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));
return file.path;
}
}
#override
void initState() {
super.initState();
Future.delayed(const Duration(milliseconds: 800), () async {
try {
await platform.invokeMethod('play', {'path': await getPath()});
} on PlatformException catch (e) {
log("Failed to play: '${e.message}'.");
}
/* final a = AudioPlayer();
a.setFilePath(await getPath());
a.play(); */
});
}
#override
Widget build(BuildContext context) {
return const Placeholder();
}
}