Advanced High-Quality Resampler

[MineCake147E]

Background and motivation

Current SplineResampler has no optimization for down-sampling at all, relying on slow BiQuad LPF.
We need another resampler for down-sampling.

Ideas

• Apply SIMD-friendly LPF
  • Wavelets like CDF 9/7 Wavelet
  • Further optimization of BiQuad filter might also be needed
• Dynamic resolution scaling
  • Decimate or interpolate samples down or up to the maximum power-of-two multiple of source frequency less than target frequency, by wavelets.
• Use existing SplineResampler for final interpolation