Usage and Applications
Data and Object Carousels are most commonly used in DVB, which has standards for broadcasting digital television content using carousels. The standard format for a carousel is defined in the Digital Storage Media Command and Control (DSM-CC) toolkit in ISO/IEC 13818-6 and is part of the Digital Audio Video Council (DAVIC) DVB standard for digital video broadcasting. The specification provides support for a variety of communication models, including provision for interactive transport control of audio and video streams in a bi-directional environment such as a cable television video on demand system.
The DSM-CC standard specifies two types of carousel, a data carousel and an object carousel. The object carousel extends the more limited data carousel and specifies a standard format for representing a file system directory structure comprising a root directory or service gateway and one or more files and directories.
Files and directories are encapsulated in a DSM-CC object carousel in several layers. Objects are encapsulated in modules, which are carried within download data blocks, within DSM-CC sections encoded in MPEG private sections which are assembled from packets.
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