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7.1. Delivery Framework

Part 6 of the MPEG-4 standard (DMIF) [MPEG4-6] is dedicated to the specification of the MPEG-4 delivery framework. This framework is a model that hides to its upper layers the details of the technology being used to access the multimedia content, and it supports virtually any known communication scenario (e.g., stored files, remotely retrieved files, interactive retrieval from a real-time streaming server, multicast, broadcast, interpersonal communication).

The delivery framework provides, in ISO/OSI terms, a session layer service (layer 5). This is further referred to as DMIF layer, and the modules making use of it are referred to as DMIF users. The DMIF layer manages sessions (e.g., associated to overall MPEG-4 presentations) and channels (e.g., associated to individual MPEG-4 elementary streams), and allows for the transmission of both user data and commands. The data transmission portion is often referred to in the literature as user plane, while the management side is referred to as control plane. The term DMIF instance is used to indicate an implementation of the delivery layer for a specific delivery technology.


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