Sound clipping/clicking when lowering volume with NAudio

1
votes

Audio is clipping (or clicking) when trying to lower the volume of a WAV file in real time.

I've tried it on a SampleChannel, VolumeSampleProvider and WaveChannel32 instance, the source being a 32bit WAV file.

If I try it on a WaveOut instance, the clipping doesn't occur anymore, but I don't want that because it lowers the volume of all sounds in the application.

And this only happens when I lower volume, rising it doesn't cause clipping.

Is this a known problem or am I supposed to approach this differently?

Note: this is how the volume drops in real time over the given time span:

0.9523049
0.9246111
0.9199954
0.89384
0.8676848
0.8415294
0.8169126
0.7907572
0.7646018
0.739985
0.7122912
0.6892129
0.6630576
0.6369023
0.6122856
0.5861301
0.5599748
0.535358
0.5092026
0.4830474
0.456892
0.4322752
0.4061199
0.3799645
0.3553477
0.3276539
0.3030371
0.2784202
0.2522649
0.2261095
0.2014928
0.176876
0.149182
0.1245652
0.09841
0.07225461
0.04763785
0.02148246
0
1
c#naudio
Are you sure the volume is 1.0 before you start to apply these factors? Are you sure no other values get set during this actions? – DrKoch
Yes, I am sure the volume always starts at 1.0 and no other values get set during the actions. I made sure by isolating the case so no other factors can interfere. – IneedHelp
Ok, apparently it is a DesiredLatency and NumberOfBuffers issue on the WaveOut instance. The default values cause the problem, altered values fix it. – IneedHelp
You could answer your own questions to allow others to find this solution. – DrKoch

1 Answers

0
votes

Apparently it is a DesiredLatency and NumberOfBuffers issue on the WaveOut instance. The default values cause the problem, altered values fix it.

These are the values I used to fix the issue.

 WaveOutDevice = new WaveOut(WaveCallbackInfo.NewWindow())
        {
            DesiredLatency = 700, //! adjust the value to prevent sound clipping/clicking
            NumberOfBuffers = 3, //! number of buffers must be carefully selected to prevent audio clipping/clicking
        };