[bug] feedFromStream() "RangeError.checkValidRange"

I need Help for :

• Using the API

---

Here is my question :

Hello everyone! I have a problem - audio streaming is not working. This is the part of the project that organizes real-time communication between users of the same group via a socket. So far I have removed the unnecessary part of the code to make it more convenient. For now, I’m just trying to make streaming work. I would be very grateful if you could help steer me in the right direction. Perhaps I did not take into account some things. This is my first flutter project and I have been writing it for a long time, a lot of things have already been implemented, but now I ran into a small problem.

I will make a description of the classes:

SoundPlayer is player; MultiSoundPlayer is players controller for several players; ActivityVoiceCommunicationIOService is a service that will later organize the playback of sound from other users.

The problem arises when i do feedHim():

2021-01-17 16:37:51.402 11278-11278/com.example.project_name E/FlautoPlayer: Feed() is not available
2021-01-17 16:37:51.404 11278-11311/com.example.project_name E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: RangeError (start): Invalid value: Not in inclusive range 0..4096: -1
    #0      RangeError.checkValidRange (dart:core/errors.dart:352:7)
    #1      _TypedIntListMixin.sublist (dart:typed_data-patch/typed_data_patch.dart:462:31)
    #2      FlutterSoundPlayer.feedFromStream (package:flutter_sound/public/flutter_sound_player.dart:983:35)
    <asynchronous suspension>
    #3      FoodData.exec (package:flutter_sound/public/tau.dart:112:58)
    #4      FlutterSoundPlayer.startPlayerFromStream.<anonymous closure>.<anonymous closure> (package:flutter_sound/public/flutter_sound_player.dart:947:44)
    #5      _rootRunUnary (dart:async/zone.dart:1198:47)
    #6      _ZoneDelegate.runUnary (dart:async/zone.dart:765:19)
    #7      AsyncAction._runUnary (package:mobx/src/api/async/async_action.dart:58:29)
    #8      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
    #9      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
    #10     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
    #11     _DelayedData.perform (dart:async/stream_impl.dart:611:14)
    #12     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:730:11)
    #13     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:687:7)
    #14     _rootRun (dart:async/zone.dart:1182:47)
    #15     _ZoneDelegate.run (dart:async/zone.dart:758:19)
    #16     AsyncAction._run (package:mobx/src/api/async/async_action.dart:44:29)
    #17     _CustomZone.run (dart:async/zone.dart:1093:19)
    #18     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
    #19     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
    #20     _rootRun (dart:async/zone.dart:1190:13)
    #21     _ZoneDelegate.run (dart:async/zone.dart:758:19)
    #22     AsyncAction._run (package:mobx/src/api/async/async_action.dart:44:29)
    #23     _CustomZone.run (dart:async/zone.dart:1093:19)
    #24     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
    #25     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
    #26     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
    #27     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)

import 'dart:async';
import 'dart:typed_data';

import 'package:flutter_sound/flutter_sound.dart';
import 'package:project_name/dto/voice-part.dto.dart';
import 'package:project_name/main.dart';
import 'package:project_name/services/activity-socket.service.dart';
import 'package:project_name/services/auth.dart';

int blockSize = 4096;

class SoundPlayer {
  FlutterSoundPlayer _mPlayer = FlutterSoundPlayer();
  bool _mPlayerIsInited = false;

  StreamController<Uint8List> streamController = StreamController();

  SoundPlayer();

  init() async {
    await _mPlayer.openAudioSession();
    await _mPlayer.startPlayerFromStream(codec: Codec.pcm16, numChannels: 1, sampleRate: 44000);
    _mPlayerIsInited = true;
    streamController.stream.listen((Uint8List buffer) async {
      return await feedHim(buffer);
    });
  }

  Future<void> feedHim(Uint8List buffer) async {
    var lnData = 0;
    var totalLength = buffer.length;
    while (totalLength > 0 && !_mPlayer.isStopped) {
      var bsize = totalLength > blockSize ? blockSize : totalLength;
      await _mPlayer.feedFromStream(buffer.sublist(lnData, lnData + bsize)); // await !!!!
      lnData += bsize;
      totalLength -= bsize;
    }
  }

  putSound(Uint8List buffer) async {
    assert(_mPlayerIsInited);
    streamController.add(buffer);
  }

  dispose() {
    stopPlayer();
    _mPlayer.closeAudioSession();
    _mPlayer = null;
  }

  Future<void> stopPlayer() async {
    await _mPlayer.stopPlayer();
  }
}

class MultiSoundPlayer {
  Map<String, SoundPlayer> _players = Map();

  playSound(String name, Uint8List buffer) async {
    if (!_players.containsKey(name)) {
      _players[name] = new SoundPlayer();
      await _players[name].init();
    }
    
    return _players[name].putSound(buffer);
  }
  
  dispose() {
    _players.forEach((key, value) {  value.dispose(); });
  }
}

class ActivityVoiceCommunicationIOService {
  Uint8List _buffer = Uint8List(BUF_SIZE * 2);

  MultiSoundPlayer player = MultiSoundPlayer();

  static final int BUF_SIZE = 65536;

  ActivityVoiceCommunicationIOService();

  int realLength = 0;

  // Will be addToSendQueue but now local test
  playSoundInPlayer(Uint8List data) async {
    if (realLength + data.length <= _buffer.length) {
      this._buffer.setAll(realLength, data);
      realLength += data.length;
    }

    if (realLength >= ActivityVoiceCommunicationIOService.BUF_SIZE) {
      if (realLength > 0) {
        player.playSound('default', _buffer.sublist(0, realLength));
      }
      this.realLength = 0;
    }
  }
}

[Larpoux]

Hi @sovaz1997 ,

Flutter Sound 7.5.3 is released. It fixes a major regression for Android that I introduced in 7.5.1 on feed()

I introduce from time to time some major regressions to be sure that there is someone who uses my work 😉 .

Sorry for that. And sorry for the delay. Good luck for your personal project

[sovaz1997]

Right. I was certainly tired. I modified the Android code without any reason. And of course, because 7.5.1 was just about the documentation of a new verb (startPlayerFromMic), I thought that it was not necessary to to a complete test.

I probably need vacations.

Thank you so much! Rest more, this is important. I will write to you by e-mail