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Module issy

dvb_bbframe

Module issy 

Source
Expand description

ISSY (Input Stream SYnchronizer) field decoding per EN 302 755 §5.1.7 / Annex C.

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§

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

Functions§

decode_issy_long
Decode a 3-byte (long) ISSY field.
decode_issy_short
Decode a 2-byte (short) ISSY field.