1、BSI Standards PublicationPD ISO/IEC TR 23008-13:2015Information technology High efficiency codingand media delivery inheterogeneous environmentsPart 13: MMT implementation guidelinesPD ISO/IEC TR 23008-13:2015 PUBLISHED DOCUMENTNational forewordThis Published Document is the UK implementation of ISO
2、/IEC TR23008-13:2015.The UK participation in its preparation was entrusted to TechnicalCommittee IST/37, Coding of picture, audio, multimedia andhypermedia information.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport t
3、o include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 86960 0ICS 35.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This Pu
4、blished Document was published under the authority of theStandards Policy and Strategy Committee on 31 December 2015.Amendments issued since publicationDate Text affectedPD ISO/IEC TR 23008-13:2015Information technology High efficiency coding and media delivery in heterogeneous environments Part 13:
5、 MMT implementation guidelinesTechnologies 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 MPEGTECHNICAL REPORTISO/IEC TR23008-13First edition2015-12-01Reference numberISO/IEC TR 2
6、3008-13:2015(E) ISO/IEC 2015PD ISO/IEC TR 23008-13:2015ii ISO/IEC 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any mean
7、s, 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 officeCh. de Blandonnet 8 CP 401CH-1214
8、 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO/IEC TR 23008-13:2015(E)PD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E)Foreword vIntroduction vi1 Scope . 12 Normative references 13 Terms, definitions, symbols and abbreviated terms . 14 Overv
9、iew . 14.1 System overview 14.2 Normative parts . 25 MMT function deployments 35.1 Overview 35.2 Object reconstruction 35.2.1 Overview . 35.2.2 Recovery in MPU mode 35.2.3 Recovery in GFD mode 55.3 Default assets . 55.4 Low-delay live streaming . 65.5 Parallel processing in MMT sending and receiving
10、 entities . 85.5.1 Processing in MMT sending entity . 85.5.2 Processing in MMT receiving entity 95.6 MPU streaming for live services 115.6.1 MPU packetization.115.6.2 Sending of MPU and signalling message 135.7 Fast MMT session acquisition . 155.8 Referencing and processing non-timed data . 165.8.1
11、Overview 165.8.2 Resource grouping and referencing .175.8.3 Receiver handling .175.9 Media adaptation for quality control in MMTP 175.9.1 Overview 175.9.2 Parameters for media adaptation 175.9.3 Adaptation operation of MMT entity .185.10 Hybrid delivery in MMT . 185.10.1 Overview 185.10.2 Classifica
12、tion of hybrid delivery 185.10.3 Technical elements for hybrid delivery .195.11 Example of detailed implementation of MMT . 205.11.1 Use case: Combination of MMT and MPEG-2 TS for synchronized presentation .205.12 HRBM signalling for hybrid delivery . 205.12.1 Hybrid delivery from the Single MMT sen
13、ding Entity 205.12.2 Hybrid delivery from the multiple MMT sending entities 225.13 Error resilience in MMT protocol 235.14 Delay constrained ARQ . 255.14.1 Overview 255.14.2 Delivery-time constrained ARQ 255.14.3 Arrival-deadline constrained ARQ .255.15 Application layer forward error correction (AL
14、-FEC) 275.15.1 FEC decoding method for ssbg_mode2 275.15.2 Usage of two stage FEC coding structure.325.15.3 MPU mapping to source packet block 335.15.4 FEC for hybrid service 356 Use cases for MMT deployment 366.1 Overview . 36 ISO/IEC 2015 All rights reserved iiiContents PagePD ISO/IEC TR 23008-13:
15、2015ISO/IEC TR 23008-13:2015(E)6.2 Delivery of DASH Presentations using MMT 366.2.1 Delivery of the MPD 376.2.2 Delivery of the data segments . 376.3 Client operation for DASH service delivered through MMT Protocol .386.3.1 Delivery of MPD with MMTP 386.3.2 Delivery and consumption of DASH Segments
16、with MMTP .386.4 Hybrid of MMT and DASH over heterogeneous network 396.5 MMT Caching for Effective Bandwidth Utilization 416.5.1 Overview of MMT caching middlebox architecture 416.5.2 Content-based caching of MMT media .426.5.3 MPU sync protocol between server and caching middlebox 436.5.4 MMT Cache
17、 Manifest .476.6 Usage of ADC signalling message . 496.6.1 Overview 496.6.2 Operation in MMT sending entity 496.6.3 Operation in MANE router . 496.6.4 Example operation in MMT receiving entities 506.7 MMT Deployment in Japanese broadcasting systems 506.7.1 Overview 506.7.2 Broadcasting systems using
18、 MMT . 506.7.3 Media transport protocol 536.7.4 Signalling information556.7.5 Start-up procedure of broadcasting service 64Bibliography .67iv ISO/IEC 2015 All rights reservedPD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E)ForewordISO (the International Organization for Standardization) and IEC
19、 (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with pa
20、rticular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have es
21、tablished 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 Directives, Part 1. In particular the different approval criteria needed for the different types of document should be noted.
22、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 the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identify
23、ing 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 declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenienc
24、e 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 about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Sup
25、plementary informationThe committee responsible for this document is ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.ISO/IEC 23008 consists of the following parts, under the general title Information technology High efficienc
26、y 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 Conformance Software Part 5: Reference software for high efficiency video coding Part 8: Conformance Specification for HEVC Pa
27、rt 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 guidelines Technical Report ISO/IEC 2015 All rights reserved vPD ISO/IEC TR 23008-13:2015ISO/IEC TR 23008-13:2015(E)Introducti
28、onThis 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 following: guidelines on usage of MMT functions; guidelines on deployment use cases designed based on ISO/IEC 23008-1.vi ISO/IEC
29、2015 All rights reservedPD ISO/IEC TR 23008-13:2015Information technology High efficiency coding and media delivery in heterogeneous environments Part 13: MMT implementation guidelines1 ScopeThis part of ISO/IEC 23008 provides technical guidelines for implementing and deploying systems based on ISO/
30、IEC 23008-1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includin
31、g any amendments) applies.ISO/IEC 230081:2014, Information technology High efficiency coding and media delivery in heterogeneous environments Part 1: MPEG media transport (MMT)3 Terms, definitions, symbols and abbreviated termsFor the purposes of this document, the terms, definitions, symbols, and a
32、bbreviated terms in ISO/IEC 23008-1 apply.4 Overview4.1 System overviewThis subclause describes the exemplary but typical system overview of MPEG Media Transport (MMT) as shown in Figure 1The media origin provides A/V media or generic files to MMT sending entity in the form of Packages or Assets whi
33、ch 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 of MPUs or generic files.The MMT sending entity fragments MPU/generic files and generates MMTP packets to deliver A/V media data itself.
34、 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 MMT-based media distribution chainTECHNICAL REPORT ISO/IEC TR 23008-13:2015(E) ISO/IEC 2015 All rights reserved 1PD ISO/IEC TR 23008-13:
35、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 augmented functions for its own purposes to utilize tools from MMT.Then, MMTP packets can be transmitted through either or both of broadcast c
36、hannel and broadband channel at its own environment and scenarios.The CI information provides presentation information, such as the location of media objects, 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
37、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-time delivery, playback and temporal/spatial presentation information of the media.4.2 Normative partsISO/IEC 23008-1 specifies a set of tools t
38、o enable advanced media transport and delivery services. Figure 2 depicts the end-to-end architecture and illustrates the different functional tools and their relationships. Moreover, it shows interfaces between existing protocols and standards defined by ISO/IEC 23008-1 and those defined in other s
39、pecifications. The tools spread over three different functional areas, Media Processing Unit (MPU) format, delivery, and signalling defined in ISO/IEC 23008-1 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
40、 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 transport protocol and a payload format. The MMTP transport protocol provides enhanced features for delivery of multimedia data, e.g. multiplexing
41、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 data which is agnostic to media types and encoding methods. The signalling function defines formats of signalling messages to manage delivery and
42、 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 aspects, such as client implementations for media reconstruction and presentation itself are not defined as normative parts of ISO/IEC 23008-1.5 M
43、MT function deployments5.1 OverviewThis Clause gives implementation guidelines on general MMT deployment based on basic functionalities provided by MMT standard itself. This Clause intends, in particular, to guide implementers to make best use of the specification for the basic topics such as, but n
44、ot limited to the following: low delay media consumption; media adaptation; hybrid delivery; error recovery.5.2 Object reconstruction5.2.1 OverviewMMTP 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 eac
45、h 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 application.Depending on the delivery mode, the recovery of the object might differ. The GFD mode usually requires that the full object is recovered prio
46、r to its delivery to the application. However, the application may request that correctly received contiguous byte ranges of the object are forwarded to the application.The MPU mode is used to deliver MPUs and usually operates on movie fragments. Alternatively, the application may request that each
47、received MFU is forwarded to the application without additional delay. It may also require that the complete MPU be reconstructed prior to forwarding it to the application.5.2.2 Recovery in MPU modeWhen operating in the MPU mode, the object flow consists of MPUs of the same asset. Each MPU is a sing
48、le 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.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
49、 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, or2) add packet to the list of packet fragments based on the MMTP sequence number and go to step a).e) If Aggregation flag A is set, extract all aggregated data units and proceed to step g) for each extracted data unit.f) If object map with same MPU_sequence_number does not exist, cre
