Definition
The Application Information Table (AIT) provides information on interactive applications associated with a DVB service. Although first used with MHP, a now deprecated middleware specification, the AIT is today used with other technologies including HbbTV. In many places in the associated documentation, the identifiers retain MHP in the name to reflect their origins, but this does not imply limitations on their use with other application types.
The AIT Descriptor – officially the MHP_AIT_Descriptor – provides information on interactive applications signalled or carried within a DVB stream. The descriptor tags listed in this registration are used to signal different types of interactive applications, e.g. HbbTV, DVB-J applications (MHP), OCAP-J, etc. MHP_AIT_Descriptors are allocated to sister standards forums that are defining interactive application standards.
Key fields
- “AIT Descriptor Specification Name” – name of an AIT Descriptor Specification (e.g. “ACME InteractiveApps 1.0”)
- “AIT Descriptor Specifier” – name of the organization specifying the “AIT Descriptor Specification Name” mentioned above (e.g. “ACME TV-Apps, Inc.”)
Allocation template
| 0x00 | Application_Descriptor |
| 0x60 to 0x64 | Allocated by MHP |
| 0x65 to 0x7F | Available for registration |
| 0x80 to 0xFF | Reserved for future use |