Resample audio in C#

using OneAudio;
 
// A whole clip, 44.1 kHz to 48 kHz with the default Polyphase filter.
AudioClip clip = Audio.Load("music.wav");
AudioClip at48 = Audio.Resample(clip, 48000);
Console.WriteLine($"{clip.Frames} frames at 44.1 kHz -> {at48.Frames} at 48 kHz");
 
// And back. The length is always round(frames x ratio), and the filter
// delay is removed.
AudioClip back = Audio.Resample(at48, 44100);
Console.WriteLine($"and back: {back.Frames} frames");
 
// Interleaved floats you already hold, at a chosen quality.
float[] voice = Audio.Load("voice.wav").Samples.ToArray();     // 16 kHz mono
ResamplerQuality[] qualities =
    [ResamplerQuality.Polyphase, ResamplerQuality.PolyphaseFast, ResamplerQuality.Linear];
foreach (ResamplerQuality q in qualities)
{
    float[] up = Audio.Resample(voice, channels: 1, fromRate: 16000, toRate: 48000, q);
    Console.WriteLine($"{q,-13} {voice.Length} -> {up.Length} samples");
}
 
// Streaming, for live audio: feed blocks of any size. The output doesn't
// depend on how the input was split.
IResampler resampler = AudioResampler.Create(inputRate: 44100, outputRate: 48000,
                                             channels: 2, ResamplerQuality.Polyphase);
float[] input = clip.Samples.ToArray();
float[] output = new float[resampler.MaxOutputFrames(512) * 2];   // fits 512 in
long produced = 0;
for (int pos = 0; pos < clip.Frames;)
{
    int frames = (int)Math.Min(512, clip.Frames - pos);
    resampler.Process(input.AsSpan(pos * 2, frames * 2), output,
                      out int used, out int written);
    pos += used;                    // input that didn't fit is offered again
    produced += written;
}
int tail;
while ((tail = resampler.Flush(output)) > 0)    // what the filter still holds
    produced += tail;
Console.WriteLine($"streamed: {produced} frames, latency {resampler.LatencyFrames:F1} frames");

1411200 frames at 44.1 kHz -> 1536000 at 48 kHz
and back: 1411200 frames
Polyphase     96400 -> 289200 samples
PolyphaseFast 96400 -> 289200 samples
Linear        96400 -> 289200 samples
streamed: 1536001 frames, latency 78.4 frames