langcod (AC-3)
The landcod is a 8-bit unsigned integer field in an ATSC AC-3 descriptor that, were it used in ATSC A/52, would give the language of an AC-3 service.
ATSC A/52 specifies this field shall be 255 / 0xFF. To signal the language used by an AC-3 service, place the ISO_639_language_code_descriptor in the ES_info loop of the Program Map Table section describing the AC-3 service.
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