0x56180 Vorbis_Configure

 Reset:
  In  R0 = -1

 Version:
  In  R0 = 0
  Out R0 = version

 Input buffer size:
  In  R0 = 1
      R1 = size in KBs or 0 to read
  Out R1 = size in KBs

 Output buffer size:
  In  R0 = 2
      R1 = size in KBs or 0 to read
  Out R1 = size in KBs

0x56181 Vorbis_Open
  Out R0 = handle
      R1 = input buffer ptr
      R2 = output buffer ptr

0x56182 Vorbis_Close
  In  R0 = handle

0x56183 Vorbis_Info
  In  R0 = handle
  Out R1 = vi structure or NULL
      R2 = vc structure or NULL
      R3 = stream serial number or -1

0x56184 Vorbis_Clear
  In  R0 = handle
      R1 = flags, bit 0 input, 1 output, 2 info

0x56185 Vorbis_Position
  In  R0 = handle
      R1 = new postion or -1 to read
  Out R1 = position in nr of samples
      R2 = sample rate in Hz
      R3 = max pos in nr of samples (duration)
      R4 = position seeked to or -1 if not seeking

0x56186 Vorbis_Attach
  In  R1 = input buffer ptr or NULL
  Out R0 = handle
      R1 = input buffer ptr
      R2 = output buffer ptr

0x56187 Vorbis_Position64
  In  R0 = handle
      R1 = ptr to pos64 struct with pos = -1 to read
  Out R1 = ptr to pos64 struct with 3 64-bit values
             pos   = position in nr of samples
             seek  = position seeked to or -1 if not seeking
             total = max pos in nr of samples
      R2 = sample rate in Hz
