ISO/IEC 13818-6: MPEG-2 Digital Storage Media Command & Control

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"ISO-IEC 13818-6-DSM_CC是国际标准化组织（ISO）和国际电工委员会（IEC）联合技术委员会JTC1下的SC29/WG11（负责音频、视频编码）制定的一项标准，专门针对数字存储媒体命令与控制（Digital Storage Media Command & Control，简称DSM-CC）。这个标准是ISO/IEC 13818-6的一部分，也被称为MPEG-2 DSM-CC，它是MPEG-2系统层的一个扩展，用于在数字存储媒体上传输和控制数据。 MPEG-2 DSM-CC的主要目标是提供一套机制，使得用户可以与网络进行交互，例如进行流媒体传输、内容下载和频道切换等操作。标准包括多个组成部分： 1. **介绍**：这部分通常会概述标准的目的、背景以及它在MPEG-2系统中的作用。 2. **消息头**：定义了在网络中传输的数据包的头部结构，这些头部信息用于标识数据类型、源和目的地等。 3. **用户到网络配置**：描述了如何建立和管理用户与网络之间的通信通道。 4. **用户到网络会话消息**：规定了用户设备如何与网络服务器进行会话控制，如请求、响应和确认等。 5. **用户到用户接口**：定义了用户设备之间或用户与服务提供商之间交互的协议和数据格式。 6. **用户兼容性**：确保不同制造商的设备能够相互通信并理解对方发送的数据。 7. **U-NDOWNLOAD**：这部分涉及从网络下载数据到用户设备的过程，可能包括多媒体内容的下载。 8. **流描述符**：提供了关于传输数据流的详细信息，如流类型、质量、编码参数等。 9. **传输**：详细说明了数据如何在不同的网络环境中有效地传输，可能包括错误检测和纠正机制。 10. **切换数字广播频道改变协议**：允许用户快速平滑地在不同数字广播频道间切换，而不中断服务。 11. **U-U对象循环**：一种机制，用于周期性地广播用户可接收的对象，如互动电视菜单或广告。 12. **U-N传递通过消息**：定义了如何在用户设备之间或用户设备与网络之间传递控制信息。此外，标准还包含了一些附录，如A部分对MHEG（Multimedia Home Environment Group）的概述，这是一种交互式多媒体应用的标准。 ISO/IEC 13818-6的实施对于数字电视、交互式服务、IP电视以及流媒体服务等领域具有重要意义，因为它提供了一套标准化的方法来实现高效的媒体数据管理和用户交互。"

ISO/IEC International Standard 13818-6 -- MPEG-2 Digital Storage Media Command & Control

12-July-1996 © ISO/IEC

Primitives written in the IDL are compiled by an IDL compiler to produce client and server stubs (executable code that

implements packet formation, dispatch, receipt, and interpretation) and a header file used during compilation of the

client and server applications.

1.6.6 Remote Procedure Call (RPC)

User-to-User (U-U) functionality exploits a Remote Procedure Call (RPC) protocol. An RPC allows implementation of

a client-server model in which applications on a client are written to call functions that are similar to those that might be

used if all actions were to be executed locally. For those U-U API primitives that use the RPC, the RPC and data

encoding defines the actual bits that are exchanged as primitives are executed. 错误！未找到引用源。 shows an

example of the data flow of an RPC execution.

The downstream reply from the Server is shown being delivered over an encapsulation in a MPEG-2 Transport Stream.

Although this document specifies how to encapsulate common protocols (e.g. IP) over MPEG-2 Transport, there is no

requirement that control messages or RPC messages be delivered within MPEG-2 Transport Streams.

1.6.6.1 Independence of RPC

DSM-CC may be implemented using any RPC which can implement primitives that are legal within the Interface

Definition Language (IDL). The RPC will include a data representation choice which defines how data structures are

mapped to bits -- for example, Network Data Representation (NDR) or Abstract Syntax Notation 1 / Basic Encoding

Rules (ASN.1/BER).

Different implementations of RPC may generate different bit patterns on a communication link for the same primitive.

Communication between a client using one RPC and a server using a different RPC would require a translator

(executing on either the server or client side) to convert the RPC packet contents from one protocol to the other.

1.6.6.2 Preferred and Default RPC

DSM-CC User-to-User has the OMG Universal Networked Objects (UNO) RPC as the default and preferred RPC. The

preferred and default data representation is Common Data Representation (CDR).

In the absence of prior arrangement, the default RPC between two DSM-CC Users is the UNO RPC. Note that the

UNO RPC supports the ability to subsequently negotiate a change to a different RPC.

1.6.6.3 Local Equivalent Functions

For DSM-CC implementations in which the client and server functions are known to be entirely local (i.e., do not

require message exchange over a network), those U-U and U-N primitives that use an RPC may be compiled by an

alternative IDL compiler which produces a single equivalent local function call definition. This allows many

applications to be simply ported between networked applications and stand-alone applications (e.g., CD-player).

Alternatively, if separate server and client processes are executing locally, the RPC protocol may be used without

modification.

1.7 Profiles and Compliance

Functional groups of DSM-CC operations are described in this document. An embodiment using DSM-CC is not

required to implement every functional group. However, if an embodiment implements operations of a group type

analogous to those described in this section then the embodiment shall implement the complete syntax and semantics of

the corresponding DSM-CC function group. If an embodiment does not implement operations of a group type described

in this section, then a function call to an unimplemented group of functions shall return a status of "Function Not

Implemented".

Functional Groups

• User-to-Network Configuration

• User-to-Network Session and Resource Management Messages Core Group

• User-to-Network Session and Resource Management Messages Extended Group

ISO/IEC International Standard 13818-6 -- MPEG-2 Digital Storage Media Command & Control

12-July-1996 © ISO/IEC

• User-to-Network Flow Controlled Download

• User-to-Network Non-Flow Controlled Download.

• User-to-Network Data Carousel Download

• User-to-User Core Interfaces

• User-to-User Extended Interfaces

• U-N Switched Digital Broadcast Channel Change

The U-U IDL Interfaces have been divided into two groups: Core Interfaces and Extended Interfaces. Full support of

the Core Interfaces shall be required from all DSM-CC U-U implementations. Each interface within the Extended set of

interfaces may be implemented separately; however, if any interface is implemented, it must be implemented in full.

U-U Core Interfaces

• Base

• Access

• Directory

• Stream

• File

• ServiceGateway

U-U Extended Interfaces

• SessionGateway

• Service

• Interfaces

• Lifecycle

• Security

• View

• Download

• Event

• Config

The U-N operations have been divided into two groups: Core Group and Extended Group. Full support of the Core

Interfaces shall be required from all DSM-CC U-N implementations. The Extended Group features have been classified

into Sub-Groups. Implementation of the features in the Extended Group are not required. However, if a Extended

Group feature, or equivalent, is implemented it must comply with the DSM-CC method and the full Sub-Group must be

implemented.

U-N Core Group

• ClientSessionSetUpRequest/Confirm

• ServerSessionSetUpIndication/Response

• ClientReleaseRequest/Indication/Response/Confirm

• ServerReleaseRequest/Indication/Response/Confirm

• ClientAddResourceIndication/Response

• ServerAddResourceRequest/Confirm

• ServerDeleteResourceRequest/Confirm

• ClientDeleteResourceIndication/Response

• ClientStatusRequest/Indication/Response/Confirm

• ServerStatusRequest/Indication/Response/Confirm

• ClientClearRequest/Indication

• ClientProceedingIndication

• ServerResetRequest/Indication/Indication/Response

• ClientResetRequest/Indication/Response/Confirm

• ClientConnectRequest/Indication

• ContinuousFeedSessionSetupRequest/Confirm

ISO/IEC International Standard 13818-6 -- MPEG-2 Digital Storage Media Command & Control

12-July-1996 © ISO/IEC

Note that although the ‘Proceeding’ and ‘Connect’ message sets must be implemented, it is not required that every

implementation use these messages in the course of session management, i.e. an implementation must support the

receipt of these messages but need not initiate their transmission.

[Editor: may want to use a table to show who must be able to generate versus respond to messages]

U-N Extended Group

Transfer Sub-Group

• ServerSessionTransferRequest/Indication/Response/Confirm

• ClientSessionTransferIndication/Response

PassThru Sub-Group

• PassThruRequest/Indication

PassThru Receipt Sub-Group

• PassThruReceipt Request/Indication/Response/Confirm

Session In Progress Sub-Group

• ClientSessionInProgress

• ServerSessionInProgress

1.8 Definitions

This section contains those definitions that are not yet defined in other MPEG (ISO/IEC 11172 and 13818) standards.

Application

Software that executes in a client environment

Association Tag

In case of connection resources an Association Tag identifies the groups of resources

or shared resources that together make up a User to User connection. An Association

Tag is unique within a session and has end-to-end significance.

Client

A consumer of a service from one or more Servers.

Connection

A transport link that provides the capability to transfer information between two or

more end points.

Downstream

Data delivery from the Server to the Client

Entity

A functional module within a Subsystem, e.g. a Client Subsystem has a U-N Entity

and an U-U Entity.

Inter-Entity

Interface

An interface between two Entities which are in different Subsystems

Intra-Entity

Interface

An interface between two Sub-entities which are both within the same Entity.

Intra-Subsystem

Interface

An interface between two Entities which are in the same Subsystem.

Network

A collection of communicating elements that provides connections and may provide

session control and/or connection control to User(s).

Main Resident

Application

The application (or process) on the Client which is present before execution of any

DSM-CC protocols, and is the initiator of the first DSM-CC protocol exchange, e.g.

U-N Config.

ISO/IEC International Standard 13818-6 -- MPEG-2 Digital Storage Media Command & Control

Primary Service

This is the first service the Client interacts with in a related collection of services.

Resident Download

A resident library capable of performing the DSM-CC Download protocol.

Resource

Descriptor

A resource descriptor stores information for a particular resource associated with a

session. It contains enough information for the Network to allocate the resource, and

track the resource once it is allocated, and de-allocate it once it is no longer needed.

Resource Sharing

In a situation where two or more resources are contained within another resource

then that resource is a shared resource. The sharing of the resource is indicated by the

shared resource descriptor which identifies the resource number of the shared

resource.

Server

A provider of a service to one or more Clients.

Service

A logical entity in the system that provides function(s) and interface(s) in support of

one or more applications. The distinction of a service from other objects is that end-

user access to it is controlled by a Service Gateway.

Service Gateway

This interface provides a directory of services and enables a Client to attach to a

service domain.

Session

An association between two Users providing the capability to group together the

resources needed for an instance of a service.

Sub-entity

An internal functional partition of an Entity.

Subsystem

A unit of logical ‘equipment’ within a DSM-CC System, e.g. Client, Server, and

SRM.

System

The embodiment of the entire scope of DSM-CC, including all Subsystems and their

intefaces.

Tap

An application visible object bound to a lower layer communications channel

Upstream

Data delivery from the Client to the Server

User

An end system that is connected to a network that can transmit information to or

receive information from other such end systems by means of the Network. A User

may function as a Client, Server, or both.

1.9 Acronyms

ADSL Asymetric Digital Subscriber Loop

AFI Authority and Format identifier

API Application Programming Interface

ASN.1/BER Abstract Syntax Notation 1/Basic Encoding Rules

ATM Asynchronous Transfer Mode

BIOP Broadcast Inter ORB Protocol

BPDU [ed] (see Annex C RFC 1483)

CDR Common Data Representation

CFS Continuous Feed Server

CORBA Common Object Request Broker Architecture

CPDU Common Protocol Data Unit

CRC Cyclic Redundancy Check

CCP Channel Change Protocol

DCE Distributed Computing Environment

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ISO/IEC 13818-6: MPEG-2 Digital Storage Media Command & Control

ISO/IEC13818-2:2000(E) - MPEG-2 Video Coding Standard

ISO/IEC 13818-1 MPEG-2 System Standard: Complete Overview and Components

MPEG-2协议详解：ISO 13818-1到9关键内容概览

ISO-IEC 13818-6.pdf

ISO-IEC-13818-6

ISO/IEC 13818-6 extension for DSM-CC

iso-13818-1_标准

ISO/IEC 13818-6(PDF)

MPEG-4 ISO 标准 ISO/IEC14496-6

IEC/ISO 13818全（1-9）1994

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