public Resampler(ResamplingQuality quality, int channels, double sampleRateRatio)
{
Quality = quality;
Channels = channels;
Ratio = sampleRateRatio;
ConverterType ct = ConverterType.SRC_ZERO_ORDER_HOLD;
switch (quality)
{
case ResamplingQuality.VeryLow:
ct = ConverterType.SRC_ZERO_ORDER_HOLD; break;
case ResamplingQuality.Low:
ct = ConverterType.SRC_LINEAR; break;
case ResamplingQuality.Medium:
ct = ConverterType.SRC_SINC_FASTEST; break;
case ResamplingQuality.High:
ct = ConverterType.SRC_SINC_MEDIUM_QUALITY; break;
case ResamplingQuality.VeryHigh:
ct = ConverterType.SRC_SINC_BEST_QUALITY; break;
case ResamplingQuality.VariableRate:
ct = ConverterType.SRC_SINC_MEDIUM_QUALITY; break;
}
_src = new SampleRateConverter(ct, channels);
_src.SetRatio(sampleRateRatio);
}
public static IResampler CreateInstance(ResamplingQuality quality, int channels, double sampleRateRatio)
{
if (Factory == null)
{
throw new NotSupportedException("Cannot create instance because no factory has been set.");
}
return(Factory.CreateInstance(quality, channels, sampleRateRatio));
}
public Resampler(ResamplingQuality quality, int channels, double sampleRateRatio)
{
Quality = quality;
Channels = channels;
Ratio = sampleRateRatio;
QualityRecipe qr = QualityRecipe.SOXR_HQ;
QualityFlags qf = QualityFlags.SOXR_ROLLOFF_SMALL;
switch (quality)
{
case ResamplingQuality.VeryLow:
qr = QualityRecipe.SOXR_QQ; break;
case ResamplingQuality.Low:
qr = QualityRecipe.SOXR_LQ; break;
case ResamplingQuality.Medium:
qr = QualityRecipe.SOXR_MQ; break;
case ResamplingQuality.High:
qr = QualityRecipe.SOXR_HQ; break;
case ResamplingQuality.VeryHigh:
qr = QualityRecipe.SOXR_VHQ; break;
case ResamplingQuality.VariableRate:
qr = QualityRecipe.SOXR_HQ; qf = QualityFlags.SOXR_VR; break;
}
double inputRate = 1;
double outputRate = sampleRateRatio;
if (qf == QualityFlags.SOXR_VR)
{
// set max variable rate
inputRate = 10.0;
outputRate = 1.0;
}
_soxr = new SoxResampler(inputRate, outputRate, channels, qr, qf);
}
public ResamplingStream(IAudioStream sourceStream, ResamplingQuality quality)
: base(sourceStream)
{
if (!(sourceStream.Properties.Format == AudioFormat.IEEE && sourceStream.Properties.BitDepth == 32))
{
throw new ArgumentException("unsupported source format: " + sourceStream.Properties);
}
properties = new AudioProperties(sourceStream.Properties.Channels, sourceStream.Properties.SampleRate,
sourceStream.Properties.BitDepth, sourceStream.Properties.Format);
this.quality = quality;
SetupResampler();
sourceBuffer = new ByteBuffer();
TargetSampleRate = properties.SampleRate;
position = 0;
}
public NAudioWdlResampler(ResamplingQuality quality, int channels, double sampleRateRatio)
{
Quality = quality;
Channels = channels;
Ratio = sampleRateRatio;
_resampler = new NAudioWdlResamplerWrapper();
// TODO apply fitting configuration settings for the different quality levels
switch (quality)
{
case ResamplingQuality.VeryLow:
break;
case ResamplingQuality.Low:
break;
case ResamplingQuality.Medium:
break;
case ResamplingQuality.High:
break;
case ResamplingQuality.VeryHigh:
break;
case ResamplingQuality.VariableRate:
break;
}
// Config in NAudio: https://github.com/naudio/NAudio/blob/master/NAudio/Wave/SampleProviders/WdlResamplingSampleProvider.cs
_resampler.SetMode(true, 2, false);
_resampler.SetFilterParms();
_resampler.SetFeedMode(true);
// Set input sample rate to 1 because we do not know the actual sample rates in here, only the desired output ratio
// The actual sample rates should be irrelevant anyway, the only thing that counts is the ratio between input and putput
_resampler.SetRates(1, sampleRateRatio);
}
public IResampler CreateInstance(ResamplingQuality quality, int channels, double sampleRateRatio)
{
return(new NAudioWdlResampler(quality, channels, sampleRateRatio));
}
public ResamplingStream(IAudioStream sourceStream, ResamplingQuality quality, double sampleRateRatio)
: this(sourceStream, quality)
{
SampleRateRatio = sampleRateRatio;
}
public ResamplingStream(IAudioStream sourceStream, ResamplingQuality quality, int outputSampleRate)
: this(sourceStream, quality)
{
TargetSampleRate = outputSampleRate;
}
public virtual void setResamplingQuality(ResamplingQuality resamplingQuality)
{
this.resamplingQuality = resamplingQuality;
}
/// <summary>
/// Create a new configuration with default values.
/// </summary>
public AudioConfiguration()
{
resamplingQuality = ResamplingQuality.LOW;
opusEncodingQuality = OPUS_QUALITY_MAX;
outputFormat = StandardAudioDataFormats.DISCORD_OPUS;
}
