Lower rates problem

[hankpillow]

Hi, I've read the the README and some comments inside the packages about lower rates ( less then 22050) and I realise we just don't have any code to cope with it.

I'm using the StandardFilter as recommended but still not working.

I'm doing something like this: sound_source = new StandardizeFilter( new SoundSource( new sound_class, new AudioDescriptor(AudioDescriptor.RATE_11025) ) );

But, looking inside the StandardizeFilter.as I checked that there isn't any condition to modify the samples (getSample) when rates are lower.

if (source.descriptor.rate == AudioDescriptor.RATE_44100) { sample = _source.getSample(numFrames); } else if (source.descriptor.rate == AudioDescriptor.RATE_22050) { sample = _source.getSample(Math.floor(numFrames/2)); }

And, following my "logic" I did something like this:

if (source.descriptor.rate == AudioDescriptor.RATE_44100) { sample = _source.getSample(numFrames); } else if (source.descriptor.rate == AudioDescriptor.RATE_22050) { sample = _source.getSample(Math.floor(numFrames/2)); }else if (source.descriptor.rate == AudioDescriptor.RATE_11025) { sample = _source.getSample(Math.floor(numFrames/4)); }

And I also changed position and frameCount methods.

But the result still mute.

Am I doing something wrong or this condition (lower rates) aren't working well yet?

cheers igor

[maxl0rd]

Hi Igor

Yes, StandardizeFilter actually only upsamples from 22k right now. It doesn't work with arbitrary sample rates. If you need to work with 11k, I would suggest writing your own Filter that quadruples the sample rate, perhaps with some interpolation, which would be fairly straightforward.