Crash in WaveformExtractor’s MediaCodec queueInputBuffer when disposing during waveform extraction

[ldcTnT]

When calling preparePlayer() with shouldExtractWaveform: true on a large audio file (e.g. longer than 10 minutes), if the page is disposed quickly after initialization, a crash occurs in the native layer:

java.lang.IllegalStateException
at android.media.MediaCodec.native_queueInputBuffer(Native Method)
at android.media.MediaCodec.queueInputBuffer(MediaCodec.java:2735)
at com.simform.audio_waveforms.WaveformExtractor$startDecode$1$1.onInputBufferAvailable(WaveformExtractor.kt:72)

It seems the MediaCodec decoder is still running in the background and trying to queue/release buffers after the controller is disposed, which leads to native crashes.

Call preparePlayer(path: ..., shouldExtractWaveform: true) on a relatively large .m4a or .ogg file.

Quickly navigate away or dispose the page (calling dispose() on PlayerController).

After a short delay, the app crashes with IllegalStateException.

Device: e.g. Pixel 6 / Redmi K40

OS: Android 12 / 13

audio_waveforms version: 1.3.0

Flutter version: [your version] (e.g. 3.22.1)

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[ujas-m-simformsolutions]

Currently mechanism to stop extractor isn't released and we might also have to looks if it get correctly disposed when controller is disposed.