def dec.step
import emerging-ezaudio@0.4.0.0/src/mp3_dec.bend as Mp3Decimport Base
939# one MPEG-1 Layer III frame. fresh 1 and an all-zero payload skip the filterbank.
940# A mono granule with big_values 1 and global_gain 0 returns that Huffman pair.
941# lib is already the scale-factor row for this sampling frequency.
942def dec.step(
943 +frame: List<&2, U32>, +nch: U32, +ov: List<&2, F32>, +qmf: List<&2, F32>, +fresh: U32, +lib: Lib
944) -> Maybe<&2, Out>:
945 dec.alt(dec.quiet(bd.drop(4n, frame), fresh), frame, nch, ov, qmf, lib)