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TECHNICAL SPECIFICATION
Hybrid Broadcast Broadband TV
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2 ETSI TS 102 796 V1.3.1 (2015-10)
Reference
RTS/JTC-030
Keywords
broadcasting, DVB, HTML, internet, multimedia
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© European Telecommunications Standards Institute 2015.
© European Broadcasting Union 2015.
All rights reserved.
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DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
HbbTV® is a registered trademark of HbbTV Association.
ETSI
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3 ETSI TS 102 796 V1.3.1 (2015-10)
Contents
Intellectual Property Rights . 12
Foreword . 12
Modal verbs terminology . 12
Introduction . 13
1 Scope . 14
2 References . 15
2.1 Normative references . 15
2.2 Informative references . 18
3 Definitions and abbreviations . 18
3.1 Definitions . 18
3.2 Abbreviations . 19
4 Overview . 21
4.1 Applications . 21
4.2 Architecture (informative) . 22
4.2.1 Introduction. 22
4.2.2 System overview . 22
4.2.3 Functional terminal components . 23
4.3 Terminal capabilities and extensions . 24
4.4 Specification overview . 24
4.5 Referenced W3C Specifications . 26
5 User experience (informative) . 26
5.0 Introduction . 26
5.1 Visual appearance of interactive applications . 26
5.1.1 Balance of video and application . 26
5.1.2 Service selection and event change . 27
5.2 User input . 28
5.3 Access to interactive applications . 29
5.3.1 Overview of ways of access . 29
5.3.2 Inaccessibility of applications . 29
5.3.3 Starting broadcast-related autostart applications . 30
5.3.3.1 Possible states of an autostart application . 30
5.3.3.2 "Red Button" applications . 31
5.3.4 Starting digital teletext applications . 31
5.3.5 Starting broadcast-independent applications . 32
5.4 Exiting and hiding broadcast-related applications . 33
5.5 Companion Screens . 33
5.6 User interface issues . 34
5.6.1 Advertising broadcast applications . 34
5.6.2 Co-existence with CI and CI Plus MMI. 34
5.6.3 Encrypted channels . 34
6 Service and application model . 34
6.1 Application model . 34
6.2 Application lifecycle . 35
6.2.1 Introduction. 35
6.2.2 Starting and stopping applications . 35
6.2.2.1 Summary . 35
6.2.2.2 Behaviour when selecting a broadcast service . 36
6.2.2.3 Behaviour while a broadcast service is selected . 37
6.2.2.4 Time-shifting behaviour . 40
6.2.2.5 Simultaneous broadcast/broadband/CI Plus application signalling . 40
6.2.2.5.1 Priority . 40
6.2.2.5.2 Not currently operational broadband connection . 41
6.2.2.5.3 Currently operational broadband connection and error accessing initial page . 41
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4 ETSI TS 102 796 V1.3.1 (2015-10)
6.2.2.5.4 Not currently operational CI Plus protocol . 41
6.2.2.5.5 Currently operational CI Plus connection and error accessing file system . 41
6.2.2.5.6 Application launch failure . 41
6.2.2.6 Broadcast-independent applications . 41
6.2.2.6.1 Lifecycle issues . 41
6.2.2.7 Suspension of access to broadcast resources . 42
6.2.2.8 Behaviour on encrypted broadcast services . 43
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6.2.2.9 Applications launched from non-HbbTV application environments . 44
6.2.2.10 Parental ratings . 44
6.2.2.11 Other general behaviour . 44
6.2.3 Application lifecycle example (informative) . 45
6.3 Application boundary . 46
6.3.1 Introduction. 46
6.3.2 Origin . 46
6.3.3 Application boundary definition . 46
7 Formats and protocols . 48
7.1 General formats and protocols . 48
7.1.1 Graphic formats . 48
7.1.2 Audio description . 48
7.2 Broadcast-specific format and protocols . 48
7.2.1 System, video, audio and subtitle formats . 48
7.2.2 Protocol for application transport . 48
7.2.3 Signalling of applications . 49
7.2.3.1 Broadcast signalling . 49
7.2.3.2 Broadcast-independent application signalling . 52
7.2.4 Synchronization . 53
7.2.5 DSM-CC carousel . 54
7.2.5.1 Mounting related constraints . 54
7.2.5.2 Initial carousel mounting . 54
7.2.5.3 Subsequent carousel mountings (during the lifecycle of an application) . 54
7.2.5.4 Constraints . 54
7.2.6 Data services . 54
7.2.7 File system acceleration . 55
7.2.7.1 Introduction . 55
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7.2.7.2 HbbTV stored groups descriptor . 55
7.2.7.3 Group location descriptor . 56
7.2.7.4 Group Manifest file name . 56
7.2.8 Protocol for download . 56
7.3 Broadband-specific format and protocols . 56
7.3.1 System, video and audio formats . 56
7.3.1.1 General requirements . 56
7.3.1.2 Systems layers . 57
7.3.1.3 Video . 58
7.3.1.4 Audio . 59
7.3.1.5 Subtitles . 59
7.3.1.5.1 TTML based subtitles . 59
7.3.1.5.2 Broadcast subtitles . 61
7.3.2 Protocols . 62
7.3.2.1 Protocols for streaming . 62
7.3.2.2 Protocols for download . 62
7.3.2.3 Void. 62
7.3.2.4 HTTP User-Agent header . 62
7.3.2.5 HTTP Redirects . 63
8 Browser application environment . 63
8.1 DAE specification usage . 63
8.2 Defined JavaScript APIs . 63
8.2.1 Acquisition of DSM-CC stream events . 63
8.2.1.1 Adding and removing stream event listeners . 63
8.2.1.2 DSM-CC StreamEvent event . 64
8.2.2 Carousel objects access with XMLHttpRequest . 64
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5 ETSI TS 102 796 V1.3.1 (2015-10)
8.2.3 APIs for media synchronization. 65
8.2.3.1 Introduction (Informative) . 65
8.2.3.2 The MediaSynchroniser embedded object . 67
8.2.3.2.0 General . 67
8.2.3.2.1 Properties . 67
8.2.3.2.2 Methods . 69
8.2.3.2.3 DOM2 events . 74
8.2.3.2.4 Error codes . 74
8.2.3.3 The CorrelationTimestamp class . 75
8.2.3.3.1 General . 75
8.2.3.3.2 Properties . 75
8.2.4 APIs for automatic deletion of downloaded content . 76
8.2.5 APIs for obtaining the LCN of a service. 76
8.2.6 Companion Screen discovery APIs . 77
8.2.6.1 HbbTVCSManager embedded object . 77
8.2.6.2 DiscoveredTerminal class . 80
8.2.6.3 DiscoveredCSLauncher class . 80
9 System integration . 81
9.1 Mapping from APIs to protocols . 81
9.1.1 Unicast streaming . 81
9.1.1.1 General streaming requirements. 81
9.1.1.2 HTTP streaming . 81
9.1.2 Unicast content download . 81
9.2 URLs . 82
9.3 Other file formats . 83
9.3.1 Stream event . 83
9.3.2 MPEG DASH event integration. 83
9.3.2.1 General . 83
9.3.2.2 HTML5 media element . 84
9.4 Presentation of adaptive bitrate content . 85
9.4.1 General . 85
9.4.2 Behaviour for HTML5 media objects . 85
9.4.3 Behaviour for the AV Control object . 86
9.5 Downloading content via FDP . 87
9.5.1 Download registration. 87
9.5.2 Single file with multiple URLs . 88
9.5.3 Properties of the Download object . 88
9.5.4 Download state diagram . 88
9.6 Media element integration . 90
9.6.1 General . 90
9.6.2 Resource management . 90
9.6.3 Transition behaviour . 90
9.6.4 Reporting and control of buffering . 91
9.6.5 Distinguishing multiple media tracks (informative) . 91
9.6.6 Controls attribute . 92
9.6.7 DRM . 92
9.6.8 Parental Rating Errors . 92
9.6.9 Downloaded Content . 92
9.6.10 Video presentation . 92
9.6.11 getStartDate method . 92
9.7 Synchronization . 93
9.7.1 Synchronization and video objects . 93
9.7.1.1 video/broadcast object . 93
9.7.1.2 HTML5 media element . 94
9.7.1.3 AV Control object . 95
9.7.2 Tolerance . 96
9.7.3 Timeline availability . 97
9.7.4 Minimum synchronization accuracy . 97
10 Capabilities . 97
10.1 Display model .
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