public IList <float> Resample(IList <float> data, float sourceRate, float targetRate)
{
var unfiltered = _baseResampler.Resample(data, sourceRate, targetRate);
if (targetRate > sourceRate)
{
var filter = _filterProvider.Get(FilterType.LowPass).First();
var context = filter.Create(targetRate, sourceRate / 2);
return(context.Filter(unfiltered));
}
else
{
return(unfiltered);
}
}
public ISound ApplyResampling(ISound sound, IResampler resampler, BigRational rate)
{
if (sound == null || !sound.Samples.Any())
{
return(null);
}
if (rate <= BigRational.Zero ||
sound[NumericData.Rate] == rate ||
sound[NumericData.Rate] == 0 ||
sound.Samples == null ||
!sound.Samples.Any() ||
sound.Samples.Any(sa => sa[NumericData.Rate] != null && sa[NumericData.Rate] <= 0))
{
return(sound);
}
var targetRate = (float)(double)rate;
var samples = new List <ISample>(sound.Samples);
var result = new Sound
{
Samples = samples.Select(s =>
{
var sourceRate = (float)(double)(s[NumericData.Rate] ?? sound[NumericData.Rate]);
var sample = new Sample
{
Data = resampler.Resample(s.Data, sourceRate, targetRate)
};
sample.CloneMetadataFrom((Metadata)s);
sample[NumericData.Rate] = rate;
return((ISample)sample);
}).ToList()
};
result.CloneMetadataFrom((Metadata)sound);
result[NumericData.Rate] = rate;
return(result);
}