Module issy 

ISSY (Input Stream SYnchronizer) field decoding per EN 302 755 §5.1.7 / Annex C Table C.1 (DVB-T2) and EN 302 307-1 Annex D Table D.1 (DVB-S2 BUFSTAT).

ISSY carries the Input Stream Clock Reference (ISCR) and, in its long form, buffer-status / time-to-output signalling, used for jitter-free transport reconstruction at the receiver. The first bit selects the form:

  bit7 = 0          -> ISCR short: 15-bit ISCR    (2-byte ISSY)
  bit7 = 1, bit6 = 0 -> ISCR long: 22-bit ISCR    (3-byte ISSY)
  bit7 = 1, bit6 = 1 -> BUFS / TTO signalling      (3-byte ISSY)

Enums

BufsUnit

BUFS unit selector — EN 302 755 Annex C, Table C.1 (2-bit field).

Issy

Decoded ISSY value (EN 302 755 §5.1.7, Annex C).

SignallingKind

Decoded BUFS/TTO signalling — EN 302 755 Annex C, Table C.1.

Functions

decode_issy_long

Decode a 3-byte (long) ISSY field.

decode_issy_short

Decode a 2-byte (short) ISSY field.