Android bug : "codec is released already"

[Nico04]

Everytime I dispose the player AFTER calling stop() manually, it throws :

I/flutter (16406): PlatformException(error, codec is released already, null, java.lang.IllegalStateException: codec is released already
I/flutter (16406): 	at android.media.MediaCodec.native_stop(Native Method)
I/flutter (16406): 	at android.media.MediaCodec.stop(MediaCodec.java:2791)
I/flutter (16406): 	at com.simform.audio_waveforms.WaveformExtractor.stop(WaveformExtractor.kt:405)
I/flutter (16406): 	at com.simform.audio_waveforms.AudioWaveformsPlugin.onMethodCall(AudioWaveformsPlugin.kt:200)
I/flutter (16406): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
I/flutter (16406): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
I/flutter (16406): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
I/flutter (16406): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(D8$$SyntheticClass:0)
I/flutter (16406): 	at android.os.Handler.handleCallback(Handler.java:1041)
I/flutter (16406): 	at android.os.Handler.dispatchMessage(Handler.java:103)
I/flutter (16406): 	at android.os.Looper.dispatchMessage(Looper.java:315)
I/flutter (16406): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:653:7)
I/flutter (16406): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:367:18)
I/flutter (16406): <asynchronous suspension>
I/flutter (16406): #2      AudioWaveformsInterface.stopWaveformExtraction (package:audio_waveforms/src/base/audio_waveforms_interface.dart:190:12)
I/flutter (16406): <asynchronous suspension>
I/flutter (16406): #3      WaveformExtractionController.stopWaveformExtraction (package:audio_waveforms/src/controllers/waveform_extraction_controller.dart:111:12)
I/flutter (16406): <asynchronous suspension>
I/flutter (16406): #4      PlayerController.dispose (package:audio_waveforms/src/controllers/player_controller.dart:320:5)
I/flutter (16406): <asynchronous suspension>

Tested on Pixel 8 runnig Android API 36.0
package v2.0.2

[tobias-ottenweller-knowunity]

experiencing the same issue

[scenteno]

Hello,
I am facing the same issue.

[Tom3652]

I was going to create the same issue on the latest version of the plugin.

[DorraY]

Also facing this issue on Samsung.

[kushagragupta-baynine]

Getting same issue, any solution or workaround.

[lavigarg-simform]

Thanks @Nico04 for the clear report and stack trace!

Root cause

WaveformExtractor.stop() runs twice:

1. When extraction reaches EOF, inside the decode callback.
2. Again from dispose() (the manual stop() → dispose() sequence you described).

decoder is never set to null between the two, so the second decoder.stop() runs on an already-released codec and throws IllegalStateException: codec is released already — exactly the WaveformExtractor.stop → onMethodCall path in your trace.

Fix

#495 serializes teardown and the decode callbacks under a single synchronized(lock), with a @Volatile released flag and an interrupt of the decode thread, so the codec is never touched after it is released. This makes both the sequential double-stop and the concurrent dispose-during-decode case safe.

This issue will be closed when #495 is merged. Please test your code against the PR and let me know if you encounter any errors and also share the stack trace. Thanks again!