Android Question Creating a VU meter to display the decibel value

[Reinald Assheuer]

Hi, I want to create a very easy app which shows me only a number which represents the loudness level.
I saw here several threads which are talking about the "audiorecorder" lib which I can't find. Is it obsolete?

I think the functionality of "AudioMaxAmplitude" or something like this could help me.

Thanks in advance
Reinald

 

[DonManfred]

https://www.b4x.com/android/forum/pages/results/?query=audiorecorder&prefix=1,2,3,17,24,29

 

[stevel05]

The audiorecorder library is in the Old Libraries Archive as it's author in no longer active on the forum. If you need to use it you can try it. There is no guarantee that it will work with more recent versions of Android though. https://www.b4x.com/android/forum/threads/audiorecorder-library-v1-00.8509/

 

[stevel05]

According to this post on StackOverflow: https://stackoverflow.com/questions...nt-volume-amplitude-in-an-android-mediaplayer

You can get a similar result using the Vizualizer library: https://www.b4x.com/android/forum/threads/audio-visualizer.41850/

It returns a result, although I am not sure exactly what it represents.

Add the line:

Log("Intensity " & ((Data(0) + 128) / 256))

to the Wave_Capture sub in the Main module to try it.

 

[MarkusR]

AudioStreamer seems a lib from Erel.
it have a RecordBuffer event.

 

[stevel05]

On further investigation of the Vizualizer class (it's been a while since I've looked at it), there is already a getMeasurementPeakRMS method, although there is a bug in the code. if you want to try it you will need to change the sub in the Visualizer class to:

'Retrieves the latest peak AND RMS measurement.
Sub getMeasurementPeakRms As PeakRMS
    Dim PRMS As JavaObject
    PRMS.InitializeNewInstance("android.media.audiofx.Visualizer.MeasurementPeakRms",Null)
    Viz.RunMethod("getMeasurementPeakRms",Array(PRMS))
    Dim Result As PeakRMS
    Result.mPeak = PRMS.GetField("mPeak")
    Result.mRMS = PRMS.GetField("mRms")
    Return Result
End Sub

In the original the Array() definitions is missing from the line : viz.RunMethod("getMeasurementPeakRms",Array(PRMS))

It appears I forgot to update the main project when the bug was reported, either change it manually or download the separate visualizer,bas file. I will update it properly later.

Also you will need to set the measurement mode:

Viz.MeasurementMode = 1

in the Activity create sub,