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TECHNICAL SPECIFICATION
Hybrid Broadcast Broadband TV
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2 ETSI TS 102 796 V1.5.1 (2018-09)
Reference
RTS/JTC-049
Keywords
broadcasting, DVB, HTML, internet, multimedia
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3 ETSI TS 102 796 V1.5.1 (2018-09)
Contents
Intellectual Property Rights . 13
Foreword . 13
Modal verbs terminology . 13
Introduction . 14
1 Scope . 16
2 References . 16
2.1 Normative references . 16
2.2 Informative references . 19
3 Definitions and abbreviations . 21
3.1 Definitions . 21
3.2 Abbreviations . 22
4 Overview . 25
4.1 Applications . 25
4.2 Architecture (informative) . 26
4.2.1 Introduction. 26
4.2.2 System overview . 26
4.2.3 Functional terminal components . 27
4.3 Terminal capabilities and extensions . 29
4.4 Specification overview . 29
4.5 Referenced W3C Specifications . 31
5 User experience (informative) . 31
5.0 Introduction . 31
5.1 Visual appearance of interactive applications . 31
5.1.1 Balance of video and application . 31
5.1.2 Service selection and event change . 32
5.2 User input . 33
5.3 Access to interactive applications . 34
5.3.1 Overview of ways of access . 34
5.3.2 Inaccessibility of applications . 35
5.3.3 Starting broadcast-related autostart applications . 35
5.3.3.1 Possible states of an autostart application . 35
5.3.3.2 "Red Button" applications . 36
5.3.4 Starting digital teletext applications . 36
5.3.5 Starting broadcast-independent applications . 37
5.4 Exiting and hiding broadcast-related applications . 38
5.5 Companion Screens . 38
5.6 User interface issues . 39
5.6.1 Advertising broadcast applications . 39
5.6.2 Co-existence with CI and CI Plus MMI. 39
5.6.3 Encrypted channels . 39
6 Service and application model . 39
6.1 Application model . 39
6.2 Application lifecycle . 40
6.2.1 Introduction. 40
6.2.2 Starting and stopping applications . 40
6.2.2.1 Summary (Informative) . 40
6.2.2.2 Behaviour when selecting a broadcast service . 41
6.2.2.3 Behaviour while a broadcast service is selected . 43
6.2.2.4 Time-shifting behaviour . 45
6.2.2.5 Simultaneous broadcast/broadband/CI Plus application signalling . 45
6.2.2.5.1 Priority . 45
6.2.2.5.2 Not currently operational broadband connection . 45
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4 ETSI TS 102 796 V1.5.1 (2018-09)
6.2.2.5.3 Currently operational broadband connection and error accessing initial page . 46
6.2.2.5.4 Not currently operational CI Plus protocol . 46
6.2.2.5.5 Currently operational CI Plus connection and error accessing file system . 46
6.2.2.5.6 Application launch failure . 46
6.2.2.6 Broadcast-independent applications . 46
6.2.2.6.1 Lifecycle issues . 46
6.2.2.6.2 Launch context signalling (informative) . 47
6.2.2.7 Access to broadcast resources while presenting broadband-delivered A/V . 49
6.2.2.8 Behaviour on encrypted broadcast services . 49
6.2.2.9 Applications launched from non-HbbTV application environments . 49
6.2.2.10 Parental ratings . 50
6.2.2.11 Other general behaviour . 50
6.2.3 Application lifecycle example (informative) . 51
6.3 Application boundary . 52
6.3.1 Introduction. 52
6.3.2 Origin . 52
6.3.3 Application boundary definition . 53
7 Formats and protocols . 54
7.1 General formats and protocols . 54
7.1.1 Graphic formats . 54
7.1.2 Audio description . 54
7.2 Broadcast-specific format and protocols . 54
7.2.1 System, video, audio and subtitle formats . 54
7.2.2 Protocol for application transport . 54
7.2.3 Signalling of applications . 56
7.2.3.1 Broadcast signalling . 56
7.2.3.2 Broadcast-independent application signalling . 58
7.2.4 Synchronization . 60
7.2.5 DSM-CC carousel . 60
7.2.5.1 Mounting related constraints . 60
7.2.5.2 Initial carousel mounting . 61
7.2.5.3 Subsequent carousel mountings (during the lifecycle of an application) . 61
7.2.5.4 Constraints . 61
7.2.6 Data services . 61
7.2.7 File system acceleration . 62
7.2.7.1 Introduction . 62
7.2.7.2 HbbTV stored groups descriptor . 62
7.2.7.3 Group location descriptor . 63
7.2.7.4 Group Manifest file name . 63
7.2.7.5 File groups referenced by multiple carousels . 63
7.2.7.6 The use_version flag . 63
7.2.8 Protocol for download . 64
7.3 Broadband-specific format and protocols . 64
7.3.1 System, video and audio formats . 64
7.3.1.1 General requirements . 64
7.3.1.2 Systems layers . 66
7.3.1.3 Video . 67
7.3.1.4 Audio . 68
7.3.1.5 Subtitles . 68
7.3.1.5.1 TTML based subtitles . 68
7.3.1.5.2 Broadcast subtitles . 70
7.3.2 Protocols . 70
7.3.2.1 Protocols for streaming . 70
7.3.2.2 Protocols for download . 71
7.3.2.3 Void. 71
7.3.2.4 HTTP User-Agent header . 71
7.3.2.5 HTTP Redirects . 71
7.3.2.6 HTTP Caching . 72
7.3.2.7 Simultaneous HTTP connections . 72
8 Browser application environment . 72
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5 ETSI TS 102 796 V1.5.1 (2018-09)
8.1 DAE specification usage . 72
8.2 Defined JavaScript APIs . 72
8.2.1 Acquisition of DSM-CC stream events . 72
8.2.1.1 Adding and removing stream event listeners . 72
8.2.1.2 DSM-CC StreamEvent event . 74
8.2.2 Carousel objects access with XMLHttpRequest . 74
8.2.3 APIs for media synchronization. 75
8.2.3.1 Introduction (Informative) . 75
8.2.3.2 The MediaSynchroniser embedded object . 77
8.2.3.2.0 General . 77
8.2.3.2.1 Properties . 77
8.2.3.2.2 Methods . 80
8.2.3.2.3 DOM2 events . 85
8.2.3.2.4 Error codes . 85
8.2.3.3 The CorrelationTimestamp class . 86
8.2.3.3.1 General . 86
8.2.3.3.2 Properties . 87
8.2.4 APIs for automatic deletion of downloaded content . 87
8.2.5 APIs for obtaining the LCN of a service. 87
8.2.6 Companion Screen discovery APIs . 88
8.2.6.1 HbbTVCSManager embedded object . 88
8.2.6.2 DiscoveredTerminal class . 91
8.2.6.3 DiscoveredCSLauncher class . 92
9 System integration . 93
9.1 Mapping from APIs to protocols . 93
9.1.1 Unicast streaming . 93
9.1.1.1 General streaming requirements. 93
9.1.1.2 HTTP streaming . 93
9.1.1.3 Media player implementations and API behaviour . 93
9.1.2 Unicast content download . 93
9.1.3 Seek accuracy . 93
9.2 URLs . 95
9.3 Other file formats . 97
9.3.1 Stream event . 97
9.3.2 MPEG DASH event integration. 97
9.3.2.1 General . 97
9.3.2.2 HTML5 media element . 97
9.4 Presentation of adaptive bitrate content . 99
9.4.1 General . 99
9.4.2 Behaviour for HTML5 media objects . 99
9.4.3 Behaviour for the A/V Control object . 100
9.5 Downloading content via FDP . 101
9.5.1 Download registration. 101
9.5.2 Single file with multiple URLs . 101
9.5.3 Properties of the Download object . 102
9.5.4 Download state diagram . 102
9.6 Media element integration . 104
9.6.1 General . 104
9.6.2 Resource management . 104
9.6.3 Transition behaviour . 105
9.6.4 Reporting and control of buffering . 105
9.6.5 Distinguishing multiple media tracks (informative) . 106
9.6.6 Controls attribute . 106
9.6.7 DRM . 106
9.6.8 Parental Rating Errors . 107
9.6.9 Downloaded Content . 107
9.6.10 Video presentation . 107
9.6.11 getStartDate method . 107
9.6.12 End of stream indication . 107
9.7 Synchronization . 108
9.7.1 Synchronization and video objects . 108
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6 ETSI TS 102 796 V1.5.1 (2018-09)
9.7.1.1 vi
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