def y.ring

emerging-ezaudio@0.4.0.0 · src/mp3_enc.bend:98

import Base

98# window the 512-slot ring in place: multiply by win and fold into 64 bins
99def y.ring(
100  win: List<&2, F32>, got: Yr, +head: U32, +k: U32, +ii: U32
101) -> Yr:
102  match win got:
103    case Nil{} yr:
104      yr
105    case +w <> tl Yr{x, bins}:
106      y.ring(tl, y.step(xs.of(Array.get(F32, x, ((head + k : U32) .&. 511 : U32))), bins, w, ii),
107        head, (k + 1 : U32), y.wrap(U32.is_eq(ii, 63), ii))