实例介绍
【实例简介】ISO/IEC 23009-1 Dynamic adaptive streaming over HTTP (DASH)
Information technology — Dynamic adaptive streaming over HTTP (DASH) —
Part 1: Media presentation description and segment formats
Technologies de l'information — Diffusion en flux adaptatif dynamique sur HTTP (DASH) —
Partie 1: Description de la présentation et formats de remise des médias
This part of ISO/IEC 23009 primarily specifies formats for the Media Presentation Description and Segments for dynamic adaptive streaming delivery of MPEG media over HTTP. It is applicable to streaming services over the Internet.
【实例截图】
【核心代码】
Contents
Page
Foreword ............................................................................................................................................................. v
Introduction ........................................................................................................................................................ vi
1 Scope ...................................................................................................................................................... 1
2 Normative references ............................................................................................................................ 1
3 Terms, definitions, symbols and abbreviated terms ......................................................................... 2
3.1 Terms and definitions ........................................................................................................................... 2
3.2 Symbols and abbreviated terms .......................................................................................................... 5
3.3 Conventions ........................................................................................................................................... 6
4 Introduction ............................................................................................................................................ 7
4.1 System description ............................................................................................................................... 7
4.2 DASH client model ................................................................................................................................ 8
4.3 DASH data model overview .................................................................................................................. 9
4.4 Protocols .............................................................................................................................................. 11
4.5 Media Stream and Representation properties .................................................................................. 12
4.6 Brands .................................................................................................................................................. 14
4.7 Schemes ............................................................................................................................................... 15
5 Media Presentation .............................................................................................................................. 16
5.1 General ................................................................................................................................................. 16
5.2 Media Presentation Description ......................................................................................................... 16
5.3 Hierarchical data model ...................................................................................................................... 18
5.4 Media Presentation Description updates .......................................................................................... 61
5.5 MPD assembly ..................................................................................................................................... 62
5.6 Base URL Processing ......................................................................................................................... 64
5.7 Program information ........................................................................................................................... 66
5.8 Descriptors ........................................................................................................................................... 67
5.9 DASH metrics descriptor .................................................................................................................... 74
5.10 Events ................................................................................................................................................... 75
6 Segment formats ................................................................................................................................. 82
6.1 Introduction .......................................................................................................................................... 82
6.2 Segment types ..................................................................................................................................... 83
6.3 Segment formats for ISO base media file format ............................................................................. 85
6.4 Segment formats for MPEG-2 transport streams ............................................................................. 88
7 Combined semantics of MPD and Segment formats ....................................................................... 94
7.1 Introduction .......................................................................................................................................... 94
7.2 General ................................................................................................................................................. 95
7.3 Media Presentation based on the ISO base media file format ........................................................ 96
7.4 Media Presentation based on MPEG-2 TS ........................................................................................ 98
8 Profiles................................................................................................................................................ 100
8.1 Definition ............................................................................................................................................ 100
8.2 Full profile .......................................................................................................................................... 101
8.3 ISO Base media file format On Demand profile ............................................................................. 101
8.4 ISO Base media file format live profile ............................................................................................ 103
8.5 ISO Base media file format main profile ......................................................................................... 104
8.6 MPEG-2 TS main profile .................................................................................................................... 105
8.7 MPEG-2 TS simple profile ................................................................................................................. 106
Annex A (informative) Example DASH client behaviour ............................................................................. 108
A.1 Introduction ........................................................................................................................................ 108ISO/IEC 23009-1:2014(E)
iv
© ISO/IEC 2014 – All rights reserved
A.2 Overview ............................................................................................................................................ 108
A.3 Segment list generation ................................................................................................................... 109
A.4 Seeking .............................................................................................................................................. 112
A.5 Support for trick modes ................................................................................................................... 113
A.6 Switching Representations .............................................................................................................. 113
A.7 Reaction to error codes ................................................................................................................... 113
A.8 Encoder clock drift control .............................................................................................................. 114
Annex B (normative) MPD schema ............................................................................................................... 115
Annex C (normative) MIME type registration for MPD ............................................................................... 121
C.1 Introduction ....................................................................................................................................... 121
C.2 MIME type and subtype .................................................................................................................... 121
C.3 Parameters ........................................................................................................................................ 122
C.4 MPD Anchors .................................................................................................................................... 122
Annex D (normative) DASH Metrics ............................................................................................................. 124
D.1 Introduction ....................................................................................................................................... 124
D.2 DASH-Metrics client reference model............................................................................................. 124
D.3 Definition of observation points ...................................................................................................... 124
D.4 Semantics of the DASH metrics ...................................................................................................... 125
Annex E (normative) Byte range requests with regular HTTP GET methods .......................................... 131
E.1 Background ....................................................................................................................................... 131
E.2 Construction rule .............................................................................................................................. 131
E.3 Examples ........................................................................................................................................... 132
Annex F (informative) Guidelines for extending DASH with other delivery formats ............................... 133
F.1 Adding delivery formats to DASH ................................................................................................... 133
F.2 Media Presentation authoring rules................................................................................................ 133
Annex G (informative) MPD Examples and MPD Usage ............................................................................. 134
G.1 Example MPD for ISO Base media file format On Demand profile .............................................. 134
G.2 Example for ISO Base media file format Live profile .................................................................... 135
G.3 Example for MPEG-2 TS Simple profile .......................................................................................... 136
G.4 Example for multiple stereo views .................................................................................................. 137
G.5 Example for SVC alternative streams ............................................................................................. 138
G.6 Example for trick play support ........................................................................................................ 139
G.7 Example for content protected by multiple schemes ................................................................... 140
G.8 Example for usage of Role descriptor ............................................................................................ 141
G.9 Example for usage of Event Messaging ......................................................................................... 142
Bibliography ................................................................................................................................................... 144
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