[HELP] QuickPlay failing due to assertion error

[RevanthRameshkumar]

I need Help for :

• Using the API ?

---

Here is my question : Hi, I'm a new flutter dev so this might be trivially answered...

I'm trying to use the quickplay class to play from a .wav file. I know the file is legit...and the app works otherwise, so here is the relevant piece of code:

    var test_track = Track.fromAsset('assets/sound/track.wav');
    QuickPlay.fromTrack(test_track);

I just call that when a button is pressed (the callback registered to onpressed has these 2 lines in it).

my dir structure for assets:

and the relevant part of my pubspec...

flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/sounds/track.wav

And the stacktrace:

E/flutter (24392): [ERROR:flutter/lib/ui/ui_dart_state.cc(184)] Unhandled Exception: 'package:sounds/src/sound_player.dart': Failed assertion: line 309 pos 12: 'track != null': is not true.
E/flutter (24392): #0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)
E/flutter (24392): #1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
E/flutter (24392): #2      SoundPlayer.play (package:sounds/src/sound_player.dart:309:12)
E/flutter (24392): #3      QuickPlay._play (package:sounds/src/quick_play.dart:159:20)
E/flutter (24392): #4      new QuickPlay._internal (package:sounds/src/quick_play.dart:75:5)
E/flutter (24392): #5      new QuickPlay.fromTrack (package:sounds/src/quick_play.dart:62:15)
E/flutter (24392): #6      MyAppState.answerPrinter (package:flutter_complete_guide/main.dart:52:15)
E/flutter (24392): #7      MyAppState.build.<anonymous closure>.<anonymous closure> (package:flutter_complete_guide/main.dart:87:57)
E/flutter (24392): #8      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:991:20)
E/flutter (24392): #9      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
E/flutter (24392): #10     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
E/flutter (24392): #11     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
E/flutter (24392): #12     BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:222:7)
E/flutter (24392): #13     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:476:9)
E/flutter (24392): #14     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:93:12)
E/flutter (24392): #15     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:138:9)
E/flutter (24392): #16     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:387:8)
E/flutter (24392): #17     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:136:18)
E/flutter (24392): #18     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:122:7)
E/flutter (24392): #19     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:381:19)
E/flutter (24392): #20     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:361:22)
E/flutter (24392): #21     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:279:11)
E/flutter (24392): #22     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:316:7)
E/flutter (24392): #23     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:280:5)
E/flutter (24392): #24     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:238:7)
E/flutter (24392): #25     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:221:7)
E/flutter (24392): #26     _rootRunUnary (dart:async/zone.dart:1202:13)
E/flutter (24392): #27     _CustomZone.runUnary (dart:async/zone.dart:1097:19)
E/flutter (24392): #28     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1002:7)
E/flutter (24392): #29     _invoke1 (dart:ui/hooks.dart:176:10)
E/flutter (24392): #30     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:276:7)
E/flutter (24392): #31     _dispatchPointerDataPacket (dart:ui/hooks.dart:96:31)

...

E/flutter (24392): [ERROR:flutter/lib/ui/ui_dart_state.cc(184)] Unhandled Exception: PlatformException(ERR_PLAYER_IS_NULL, setVolume(), ERR_PLAYER_IS_NULL, null)
E/flutter (24392): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:582:7)
E/flutter (24392): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:159:18)
E/flutter (24392): <asynchronous suspension>
E/flutter (24392): #2      PlayerBasePlugin.setVolume (package:sounds/src/plugins/player_base_plugin.dart:123:5)
E/flutter (24392): <asynchronous suspension>
E/flutter (24392): #3      SoundPlayer.setVolume.<anonymous closure> (package:sounds/src/sound_player.dart:450:7)
E/flutter (24392): <asynchronous suspension>

[RevanthRameshkumar]

Getting the same error when doing it w/ URL:

QuickPlay.fromURL('https://www2.cs.uic.edu/~i101/SoundFiles/ImperialMarch60.wav');

[bsutton]

welcome to futter dev :)

First a bit of feedback.
When raising an issue you need to provide some more detail.
You need to provide enough information so the developer doesn't have to guess how to reproduce the problem.

For flutter you should at a minimum provide:

flutter version.
dart version

You should also try try to provide a minimal app that demonstrates the problem.

In this case I think you are using the 0.9.3 version. The beta has a fix for this issue.

[cubuspl42]

@bsutton But... it it like some corner case issue, or just does QuickPlay.fromTrack not work at all? Because if that's the case, then it sounds (pun not intended) a bit like a stable channel deserves a backport, as it's been nearly two months since this issue was filed and beta is still in beta.

[cubuspl42]

I also have this error:

final track = Track.fromAsset(path);
QuickPlay.fromTrack(track);

I/flutter ( 8662): Uncaught asynchronous exception: 'package:sounds/src/sound_player.dart': Failed assertion: line 317 pos 12: 'track != null': is not true., stack trace:
I/flutter ( 8662):   dart:core-patch/errors_patch.dart 46:39                              _AssertionError._doThrowNew
I/flutter ( 8662):   dart:core-patch/errors_patch.dart 36:5                               _AssertionError._throwNew
I/flutter ( 8662):   package:sounds/src/sound_player.dart 317:12                          SoundPlayer.play
I/flutter ( 8662):   package:sounds/src/quick_play.dart 159:20                            QuickPlay._play
I/flutter ( 8662):   package:sounds/src/quick_play.dart 75:5                              new QuickPlay._internal
I/flutter ( 8662):   package:sounds/src/quick_play.dart 62:15                             new QuickPlay.fromTrack
I/flutter ( 8662):   package:lifepal_app/ui/routes/main_route/today/today_tab.dart 54:19  MainRouteTodo.build.play
I/flutter ( 8662):   package:lifepal_app/ui/routes/main_route/today/today_tab.dart 62:9   MainRouteTodo.build
I/flutter ( 8662):   package:flutter/src/widgets/framework.dart 4701:28                   StatelessElement.build
I/flutter ( 8662):   package:flutter_hooks/src/framework.dart 428:27                      HookElement.build

Tested with both ^0.9.3 and ^1.0.0-beta13

[cubuspl42]

@bsutton I think you might be confused with how constructors work in Dart. In the following code:

  QuickPlay.fromTrack(this._track,
      {double volume, bool withShadeUI = false, PlayerEvent onStopped})
      : _onStopped = onStopped {
    QuickPlay._internal(volume, withShadeUI);
  }

...QuickPlay._internal(volume, withShadeUI) is not constructor delegation of any kind, it's just an expression creating a new object of type QuickPlay, using the _internal constructor. The same applies to fromFile and fromBuffer, basically the whole class. My guess is that QuickPlay never worked at all.

[bsutton]

I think you are correct. I will try to get an update out over the next few days. I'm a little constrained on time at the moment as I'm in the middle of a renovation which I'm doing a chunk of.

…

On Fri, 12 Feb 2021 at 03:05, cubuspl42 ***@***.***> wrote: @bsutton <https://github.com/bsutton> I think you might be confused with how constructors work in Dart. In the following code: QuickPlay.fromTrack(this._track, {double volume, bool withShadeUI = false, PlayerEvent onStopped}) : _onStopped = onStopped { QuickPlay._internal(volume, withShadeUI); } ...QuickPlay._internal(volume, withShadeUI) is not constructor delegation of any kind, it's just an expression creating a new object of type QuickPlay, using the _internal constructor. The same applies to fromFile and fromBuffer, basically the whole class. My guess is that QuickPlay never worked at all. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAG32OAKBFXA7U3MKV7RFV3S6P52XANCNFSM4VO6PL4Q> .

[bsutton]

Released in 1.0.0