ANSI SCTE 26:2017 pdf free download – Home Digital Network Interface Specification with Copy Protection
4.3.3.1 MPEG TS
When a digital video service is selected, the Host Device shall tune the appropriate MPEG multiplex, and select the appropriate packets corresponding to the video, audio, private data, and control information needed by the display. If access-controlled services are required then the Host Device shall pass the selected streams to the access control circuitry which shall decrypt the streams as applicable. The packets shall be transported over the 1394 interface as an isochronous channel using the IEC 61883-4 [3] standard. This output of the Host Device shall be an MPEG Single Program Transport Stream (SPTS) and as such does not require any generalized System/Service Information such as ATSC A/65 (PSIP). However, the SPTS does require Program Specific Information (PSI), particularly the Program Association Table (PAT) and Program Map Table (PMT). In the general case, an MPEG-2 Transport Stream may contain multiple services. For the purpose of delivering a selection of services to the DTV for decoding, the source device shall create a Single Program Transport Stream (SPTS). An SPTS is a valid MPEG-2 Transport Stream, but it contains just one MPEG-2 program. CEA-775 [9] specifies the behavior of the DTV when presented with an SPTS. When processing MPEG programs, all elementary stream references shall be maintained unless a user option has de-selected an elementary stream. This provision ensures that downstream devices that may be present are afforded the option to process any parts of a digital service that have not been processed in the Host Device. Note that selection of an audio language track in the Host Device by the user may be considered to be an implicit de- selection of all other languages, hence they may be removed from the output SPTS. At minimum, “removal” means removal of elementary stream references from the PMT. Deletion of transport packets for the un-referenced streams is permitted.
4.3.3.2 Content Advisory (V-chip)
Data The Host Device may process content advisory data when present. However, the Host Device shall not remove content advisory data that may be present in program streams when constructing an output SPTS.
4.3.3.3 Digital Content Copy Protection Specification
Content Copy Protection shall be provided for MPEG TS based on the DTCP Specification [4]. The level of copy protection shall be determined based on the setting in the Copy Control Information (CCI) field, as defined in [11].
4.3.3.4 Digital Interface Command Specification
The primary command interface with the HDTV (or other primary target display) connected to the Host Device shall be through the OSD and Host Device remote control. The Host Device shall support the 1394 Trade Association AV/C Digital Interface Command Set for communicating with other 1394 devices on the network. The target display shall comply with the AV/C Digital Interface Command Set General Specification [5]. Support for those commands and command forms indicated as “mandatory” in the AV/C Specification shall be required for this specification. Specifically, the Host Device shall respond to the AV/C UNIT INFO and SUBUNIT INFO status commands. The Host Device shall support the POWER control commands (power on, power off and status inquiry). The Host Device may support other AV/C commands.