1、BSI Standards Publication PD ISO/IEC TR 23008-13:2015 Information technology High efficiency coding and media delivery in heterogeneous environments Part 13: MMT implementation guidelinesPD ISO/IEC TR 23008-13:2015 PUBLISHED DOCUMENT National foreword This Published Document is the UK implementation
2、 of ISO/IEC TR 23008-13:2015. The UK participation in its preparation was entrusted to Technical Committee IST/37, Coding of picture, audio, multimedia and hypermedia information. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does
3、 not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 86960 0 ICS 35.040 Compliance with a British Standard cannot confer immunity from lega
4、l obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 December 2015. Amendments issued since publication Date Text affectedPD ISO/IEC TR 23008-13:2015 Information technology High efficiency coding and media delivery in heterogen
5、eous environments Part 13: MMT implementation guidelines Technologies de linformation Codage haute efficacit et livraison des medias dans des environnements htrognes Partie 13: Lignes directrices de mise en oeuvre du transport des medias MPEG TECHNICAL REPORT ISO/IEC TR 23008-13 First edition 2015-1
6、2-01 Reference number ISO/IEC TR 23008-13:2015(E) ISO/IEC 2015 PD ISO/IEC TR 23008-13:2015ii ISO/IEC 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
7、 otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright o
8、ffice Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC TR 23008-13:2015(E)PD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E)Foreword v Introduction vi 1 Scope . 1 2 Normative references 1 3 Terms, defi
9、nitions, symbols and abbreviated terms . 1 4 Overview . 1 4.1 System overview 1 4.2 Normative parts . 2 5 MMT function deployments 3 5.1 Overview 3 5.2 Object reconstruction 3 5.2.1 Overview . 3 5.2.2 Recovery in MPU mode 3 5.2.3 Recovery in GFD mode 5 5.3 Default assets . 5 5.4 Low-delay live strea
10、ming . 6 5.5 Parallel processing in MMT sending and receiving entities . 8 5.5.1 Processing in MMT sending entity . 8 5.5.2 Processing in MMT receiving entity 9 5.6 MPU streaming for live services 11 5.6.1 MPU packetization.11 5.6.2 Sending of MPU and signalling message 13 5.7 Fast MMT session acqui
11、sition .15 5.8 Referencing and processing non-timed data .16 5.8.1 Overview 16 5.8.2 Resource grouping and referencing .17 5.8.3 Receiver handling .17 5.9 Media adaptation for quality control in MMTP 17 5.9.1 Overview 17 5.9.2 Parameters for media adaptation 17 5.9.3 Adaptation operation of MMT enti
12、ty .18 5.10 Hybrid delivery in MMT .18 5.10.1 Overview 18 5.10.2 Classification of hybrid delivery 18 5.10.3 Technical elements for hybrid delivery .19 5.11 Example of detailed implementation of MMT .20 5.11.1 Use case: Combination of MMT and MPEG-2 TS for synchronized presentation .20 5.12 HRBM sig
13、nalling for hybrid delivery .20 5.12.1 Hybrid delivery from the Single MMT sending Entity 20 5.12.2 Hybrid delivery from the multiple MMT sending entities 22 5.13 Error resilience in MMT protocol 23 5.14 Delay constrained ARQ .25 5.14.1 Overview 25 5.14.2 Delivery-time constrained ARQ25 5.14.3 Arriv
14、al-deadline constrained ARQ .25 5.15 Application layer forward error correction (AL-FEC) . .27 5.15.1 FEC decoding method for ssbg_mode2 27 5.15.2 Usage of two stage FEC coding structure.32 5.15.3 MPU mapping to source packet block 33 5.15.4 FEC for hybrid service 35 6 Use cases for MMT deployment 3
15、6 6.1 Overview .36 ISO/IEC 2015 All rights reserved iii Contents PagePD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E)6.2 Delivery of DASH Presentations using MMT 36 6.2.1 Delivery of the MPD . .37 6.2.2 Delivery of the data segments .37 6.3 Client operation for DASH service delivered through M
16、MT Protocol .38 6.3.1 Delivery of MPD with MMTP 38 6.3.2 Delivery and consumption of DASH Segments with MMTP .38 6.4 Hybrid of MMT and DASH over heterogeneous network 39 6.5 MMT Caching for Effective Bandwidth Utilization 41 6.5.1 Overview of MMT caching middlebox architecture 41 6.5.2 Content-based
17、 caching of MMT media .42 6.5.3 MPU sync protocol between server and caching middlebox 43 6.5.4 MMT Cache Manifest .47 6.6 Usage of ADC signalling message .49 6.6.1 Overview 49 6.6.2 Operation in MMT sending entity 49 6.6.3 Operation in MANE router .49 6.6.4 Example operation in MMT receiving entiti
18、es 50 6.7 MMT Deployment in Japanese broadcasting systems 50 6.7.1 Overview 50 6.7.2 Broadcasting systems using MMT .50 6.7.3 Media transport protocol 53 6.7.4 Signalling information55 6.7.5 Start-up procedure of broadcasting service 64 Bibliography .67 iv ISO/IEC 2015 All rights reservedPD ISO/IEC
19、TR 23008-13:2015ISO/IEC TR 23008-13:2015(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the developme
20、nt of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental,
21、 in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directiv
22、es, Part 1. In particular the different approval criteria needed for the different types of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of th
23、e elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declar
24、ations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information a
25、bout ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
26、 information. ISO/IEC 23008 consists of the following parts, under the general title Information technology High efficiency coding and media delivery in heterogeneous environments: Part 1: MPEG media transport (MMT) Part 2: High efficiency video coding Part 3: 3D Audio Part 4: MMT Reference and Conf
27、ormance Software Part 5: Reference software for high efficiency video coding Part 8: Conformance Specification for HEVC Part 10: MPEG Media Transport Forward Error Correction (FEC) Codes Part 11: MPEG Media Transport Composition Information Part 12: Image file format Part 13: MMT implementation guid
28、elines Technical Report ISO/IEC 2015 All rights reserved vPD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E) Introduction This part of ISO/IEC 23008 provides guidelines for implementation and deployment of multimedia systems based on the ISO/IEC 23008 standard. These guidelines include the follo
29、wing: guidelines on usage of MMT functions; guidelines on deployment use cases designed based on ISO/IEC 23008-1.vi ISO/IEC 2015 All rights reservedPD ISO/IEC TR 23008-13:2015Information technology High efficiency coding and media delivery in heterogeneous environments Part 13: MMT implementation gu
30、idelines 1 Scope This part of ISO/IEC 23008 provides technical guidelines for implementing and deploying systems based on ISO/IEC 23008-1. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For d
31、ated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 230081:2014, Information technology High efficiency coding and media delivery in heterogeneous environments Part 1: MPEG media transport
32、(MMT) 3 Terms, definitions, symbols and abbreviated terms For the purposes of this document, the terms, definitions, symbols, and abbreviated terms in ISO/IEC 23008-1 apply. 4 Overview 4.1 System overview This subclause describes the exemplary but typical system overview of MPEG Media Transport (MMT
33、) as shown in Figure 1 The media origin provides A/V media or generic files to MMT sending entity in the form of Packages or Assets which are defined in ISO/IEC 23008-1. A Package is comprised of Assets, Presentation Information and Transparent Chanrateristics, etc. Physically, an Asset is a group o
34、f MPUs or generic files. The MMT sending entity fragments MPU/generic files and generates MMTP packets to deliver A/V media data itself. Concurrently, it also generates signalling message for the successful delivery and presentation of A/V media included on that MMTP packet flow. Figure 1 Example of
35、 MMT-based media distribution chain TECHNICAL REPORT ISO/IEC TR 23008-13:2015(E) ISO/IEC 2015 All rights reserved 1PD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E) The MMT Aware Network Element (MANE) may be any network element, such as, media caches and routers, that aware of MMTP and has aug
36、mented functions for its own purposes to utilize tools from MMT. Then, MMTP packets can be transmitted through either or both of broadcast channel and broadband channel at its own environment and scenarios. The CI information provides presentation information, such as the location of media objects,
37、as well as the timing and relation of the media objects that MMT receiving entity has to follow. This information is provided by MMT sending entity and also pushes related MMTP packet flow to the MMT receiving entity. It means it fully controls the media streaming session, i.e. it manages the on-tim
38、e delivery, playback and temporal/spatial presentation information of the media. 4.2 Normative parts ISO/IEC 23008-1 specifies a set of tools to enable advanced media transport and delivery services. Figure 2 depicts the end-to-end architecture and illustrates the different functional tools and thei
39、r relationships. Moreover, it shows interfaces between existing protocols and standards defined by ISO/IEC 23008-1 and those defined in other specifications. The tools spread over three different functional areas, Media Processing Unit (MPU) format, delivery, and signalling defined in ISO/IEC 23008-
40、 1 are as follows. The Media Processing Unit (MPU) defines the logical structure of media content format of the data units to be processed by an MMT entity and their instantiation with ISO Base Media File Format as specified in ISO/IEC 14496-12. The delivery function defines an application layer tra
41、nsport protocol and a payload format. The MMTP transport protocol provides enhanced features for delivery of multimedia data, e.g. multiplexing and support of mixed use of streaming and download delivery in a single packet flow. The payload format is defined to enable the carriage of encoded media d
42、ata which is agnostic to media types and encoding methods. The signalling function defines formats of signalling messages to manage delivery and consumption of media data. Figure 2 MMT functions deployment2 ISO/IEC 2015 All rights reservedPD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E) Other
43、aspects, such as client implementations for media reconstruction and presentation itself are not defined as normative parts of ISO/IEC 23008-1. 5 MMT function deployments 5.1 Overview This Clause gives implementation guidelines on general MMT deployment based on basic functionalities provided by MMT
44、 standard itself. This Clause intends, in particular, to guide implementers to make best use of the specification for the basic topics such as, but not limited to the following: low delay media consumption; media adaptation; hybrid delivery; error recovery. 5.2 Object reconstruction 5.2.1 Overview M
45、MTP is designed to deliver object flows that may be multiplexed together in the same MMTP flow. The objects of an object flow are usually related to each other, meaning that the application is likely to consume all objects of an object flow, if the flow or one of its objects is of interest to that a
46、pplication. Depending on the delivery mode, the recovery of the object might differ. The GFD mode usually requires that the full object is recovered prior to its delivery to the application. However, the application may request that correctly received contiguous byte ranges of the object are forward
47、ed to the application. The MPU mode is used to deliver MPUs and usually operates on movie fragments. Alternatively, the application may request that each received MFU is forwarded to the application without additional delay. It may also require that the complete MPU be reconstructed prior to forward
48、ing it to the application. 5.2.2 Recovery in MPU mode When operating in the MPU mode, the object flow consists of MPUs of the same asset. Each MPU is a single object in the object flow and shares the same packet_id as all MPUs of the same asset. The MMT receiving entity performs the following steps.
49、 a) Receive MMTP packet. b) Check if packet_id is equal to the packet_id of the object flow of interest, discard packet and go to step a) if it does not belong to an object flow of interest. c) Assert that type of the MMTP packet is MPU. d) If fragmentation flags are set (different than “00”) 1) if fragmentation flag is equal to “11”, attempt to recover packet and if successful go to step f, or 2) add packet to the list of packet fragments based o
