SMPTE EG 2032-4-2007 Media Dispatch Protocol (MDP) Engineering Guideline (Informative)《媒体调度协议(MDP) 工程指南(资料性)》.pdf
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1、 Copyright 2007 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved December 14, 2007 Table of Contents Page Foreword . 4 Introduction . 4 1 Scope 5 2 MDP Document Structure . 5 3 What Problem Does MDP Address?. 6 4 How Does
2、 MDP Relate to? . 7 4.1 Applications 7 4.2 Transfer Protocols 7 4.3 File Formats . 7 4.4 Security Technologies 7 4.5 Metadata 8 4.6 Web Services. 8 4.7 Middleware. 8 4.8 Proprietary Delivery Solutions 8 4.9 BXF 8 4.10 TV-Anytime, ADI, SIP/SDP, etc. 8 5 How Does MDP Work . 9 5.1 Organizations and Age
3、nts 9 5.2 Projects 10 5.3 Transaction 10 5.4 Initiator Target Agents 10 5.5 Push-Mode, Pull-Mode and Use Cases. 10 5.6 The Manifest Document (Part One). 11 5.7 Messages and Endpoints. 12 5.8 Data Structures 13 5.9 The Manifest Document (Part Two). 13 5.9.1 manifest elements. . 14 Page 1 of 35 pages
4、EG 2032-4-2007SMPTE ENGINEERING GUIDELINE Media Dispatch Protocol (MDP) Engineering Guideline (Informative)EG 2032-4-2007 Page 2 of 35 pages 5.9.2 transferoption elements14 5.9.3 file elements. 15 5.9.4 transferewith elements and status properties. .15 5.9.5 details, updated and comment properties.
5、16 5.10 Transfers, Controllers, Senders and Receivers 16 5.11 The Capabilities Document .17 6 What Happens During a Typical Delivery?18 6.1 Before Initation. .18 6.2 Initiation. 18 6.3 Negotiation.19 6.4 Start of Transfer.19 6.5 During Transfer20 6.5.1 Status check. .20 6.5.2 Pause and resume. .20 6
6、.5.3 Checking received files22 6.6 Completion22 7 What Happens When Things Go Wrong? .22 7.1 General22 7.2 Error Responses and reason Properties. 23 7.3 Stalled and Failed Transfers and updated Properties.23 7.4 Problems that MDP Cannot Express.24 8 How Will MDP Be Kept Both Interoperable and Future
7、-Proof?.24 8.1 Additional Profiles24 8.2 Additional Mappings. .25 8.3 Transfer Protocols. 25 8.4 Capabilities Document.26 9 Can MDP Carry Metadata? .26 10 What Must Be Implemented and What is Optional?27 11 How Can Transfers Be Scheduled and Prioritized?27 12 How Can Agents Discover Each Other? .28
8、13 How Can Good Transfer Performance Be Obtained?.28 14 How Can Deliveries Be Secured .28 14.1 General28 14.2 Authentication29 14.3 Integrity Check.29 14.4 Manifest Document Properties 29 15 Can Parts of Files Be Transferred?.29 16 How Can MDP Work through a Firewall or NAT? .30 17 How Can MDP Be Us
9、ed within a Department or Facility 31 EG 2032-4-2007 Page 3 of 35 pages 18 Can MDP Be Used for Streamed or Live Content? 31 19 Can MDP Be Used for Delivery to Multiple Recipients. 31 Annex A Requirement for Post-Production File Transfer 32 A.1 General. 32 A.2 Target Use Cases. 32 A.3 Simplicity. 32
10、A.4 Packaging. 33 A.5 Content . 33 A.6 Transfer 33 A.7 Security. 33 A.8 Performance and Reliability 34 A.9 Control and Monitoring . 34 A.10 Standards 34 Annex B Glossary . 35 EG 2032-4-2007 Page 4 of 35 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an international
11、ly-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engineering Guidelines, are prepared by SMPTEs Techn
12、ology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of i
13、ts Administrative Practices. SMPTE Engineering Guideline EG 2032-4 was prepared by Technology Committee S22 on Committee on Television Systems Technology. Introduction The Media Dispatch Protocol (MDP) is a means of orchestrating the delivery of media files over IP networks. It defines a standard me
14、chanism for implementations to initiate a delivery, to negotiate the details of the delivery, to provide information about the progress of the delivery, and to provide a confirmation of the outcome of the delivery. It is important to note that MDP is not a transfer protocol. Instead it allows organi
15、zations to transfer files at agreed times, using agreed transfer protocols, and using an agreed set of secure technologies (where appropriate). Furthermore, MDP is not overly prescriptive in regards to which protocols or technologies shall be used; rather it provides a framework which allows organiz
16、ations to choose those that best suit their own needs. This document is the MDP Engineering Guideline. It provides an introduction to the protocol, explains what problem it is intended to solve, and outlines how it works. It also provides information what is contained in the normative MDP specificat
17、ion documents. EG 2032-4-2007 Page 5 of 35 pages 1 Scope This Engineering Guideline gives an introduction to the Media Dispatch Protocol (MDP) for the orchestration of the delivery of media files over IP networks. It describes the purpose of the protocol, and presents an outline of the technology in
18、volved, including an overview of the messages and data structures of the protocol, and how the protocol can be extended to meet future scenarios. The Guideline provides advice on how the protocol can be used in practice, and what should be implemented. It also outlines how common transfer protocols
19、and security mechanisms might be used in conjunction with MDP. 2 MDP Document Structure The MDP specification is split into a number of separate parts (see Figure 1) in order to create a document structure that allows new applications to be covered in the future. These parts are: Part 1 (Normative),
20、 the MDP protocol specification (SMPTE 2032-1). Part 2 (Normative), the MDP mapping specifications (e.g. SMPTE 2032-2 is the MDP/XML/HTTP mapping). Part 3 (Normative), the MDP profile specifications (e.g. SMPTE 2032-3 is the MDP Basic Target Pull profile). Part 4 (Informative), the MDP Engineering G
21、uideline (this document). Figure 1 MDP document suite When implementing MDP, you should ensure that you have the latest version of all of these documents. The individual mapping and profile specifications will be independently updated. Part 1 Protocol Specification (Normative) Part 2.x Mapping Speci
22、fication (Normative) Part 3.x Profile Specification (Normative) Part 4 Engineering Guideline (Informative) Administrative register of transfer protocols XML Schema At smpte-ra.org EG 2032-4-2007 Page 6 of 35 pages This document is the MDP Engineering Guideline (Part 4). It provides an introduction a
23、nd description. This document should be read first because it introduces many of the concepts and explains what problem MDP is intended to solve. It is presented as a set of questions (or an extended FAQ). Concepts are introduced gradually, and, where necessary, more detail is added later. This make
24、s the document easier to read, but less good as a reference, so you are encouraged to make full use of the table of contents. Annex B of this document lists the defined terms in the specification. The MDP protocol specification (Part 1) is at the core of the MDP standard. It defines the syntax and s
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