def hdr.layer

emerging-ezaudio@0.4.0.0 · src/mp3.bend:18

import Base

18# 'MPEG-1 Layer III' is layer code 1 in the header
19def hdr.layer(xs: List<&2, U32>) -> U32:
20  match xs:
21    case _b0 <> +b1 <> _b2 <> _b3 <> _rest:
22      ((b1 >> 1n : U32) .&. 3 : U32)
23    case _:
24      0