[HELP]: decibel value of recorder onProgress goes up fast but goes down slow

[yusukefs]

Thank you very much for a wonderful project!

I'm trying to visualize the amplitude of the recorded sound. I used onProgress method by calling setSubscriptionDuration in advance.

// _myRecorder is an instance of FlutterSoundRecorder
await _myRecorder.openRecorder();
await _myRecorder.setSubscriptionDuration(const Duration(milliseconds: 10));
_myRecorder.onProgress!.listen((e) {
  print(e.duration);
  print(e.decibels);
});

Although the decibel value goes higher quickly, it goes down slower. Here is the recorded video of the log.

https://user-images.githubusercontent.com/13210107/157698482-37d6d25a-6f07-4c73-a787-97c391a4e740.mov

The decibel value seems to go down after about a second from when the maximum decibel value was observed. I seems like the decibel value is calculated by taking the maximum value from a window of around a second.

Is there any other setting except for the setSubscriptionDuration that I'm missing?

I'm using

• flutter_sound 9.1.3 (that latest one)
• an actual iOS device (iPad Pro 10.5, iOS 15.3.1)

[Larpoux]

I am currently working on Taudio. Taudio will be something like a successor of Flutter Sound. With Taudio, the App will be able to receive notifications about what is recording. It will be possible to know not only the global decibel level, but also which frequencies. It will be even possible to do some filtering if some frequencies are too high or too low.

I have great expectations on Taudio. This library will be terrific 🙄

[geoox]

@Larpoux greatly appreciate the effort and looking forward to trying it out :)

[github-actions[bot]]

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