Mp3.hdr.index: def of emerging-ezaudio@0.4.0.0
Import: import emerging-ezaudio@0.4.0.0/src/mp3.bend as Mp3
Lines 34-40 of emerging-ezaudio@0.4.0.0/src/mp3.bend: https://jend.leeeet.dev/read.txt?path=emerging-ezaudio@0.4.0.0/src/mp3.bend&start_line=34&end_line=40

import Base

# bitrate index, 0 and 15 are not a frame
def hdr.index(xs: List<&2, U32>) -> U32:
  match xs:
    case _b0 <> _b1 <> +b2 <> _b3 <> _rest:
      (b2 >> 4n : U32)
    case _:
      0

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shrn