continuity counter
節目專用信息 （Program Specific Information, PSI）是一種有關節目程序與M2T的元數據，在數位電視系統中，指出節目的特別信息，終端機器（如機頂盒）只有通過這些信息才能搜索出節目來。PSI一般包括五者：
- PAT（Program Association Table）
- PMT（Program Map Table）
- NIT（Network Information Table）
- CAT（Condition Access Table）
- TDT（Time and Date Table）
/* Continuity check */
/* Return if no payload in the TS packet */
/* Skip the adaptation_field if present */
/* Unit start -> skip the pointer_field and a new section begins */
When the payload of the Transport Stream packet contains PSI data, the payload_unit_start_indicator has the following significance: if the Transport Stream packet carries the first byte of a PSI section, the payload_unit_start_indicator value shall be '1', indicating that the first byte of the payload of this Transport Stream packet carries the pointer_field. If the Transport Stream packet does not carry the first byte of a PSI section, the payload_unit_start_indicator value shall be '0', indicating that there is no pointer_field in the payload. Refer to 2.4.4.1 and 2.4.4.2. This also applies to private streams of stream_type 5 (refer to Table 2-29).
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