digital television based on the mpeg-2...
TRANSCRIPT
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Digital Televisionbased on the
MPEG-2 Standard
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Overview
• MPEG-2• Digital TV• DVB• PSI tables structure• Digital TV Distribution System• The MHP system
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MPEG History• Moving Picture Experts Group was founded in January
1988 by Leonardo Chiariglione together with around 15experts in compression technology
• Creator of numerous standards like MPEG-1, MPEG-2,MPEG-4, MPEG-7, MPEG-21 etc.
• The Group has not limited it’s scope to only “pictures” –sound wasn’t forgot (e.g. MPEG-1 Layer3)
• Because almost all of their work is a success story, theindustry adopted fast the MPEG standard (Philips,Samsung, Intel, Sony etc)
• MPEG has given birth to a number of technologies wetake now for granted: DVD and Digital TV (MPEG-2),MP3 (MPEG-1 L3)
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MPEG-2
• In 1994, MPEG has published the ISO/IEC-13818, also known as MPEG-2
• MPEG-2 was the standard adopted by DVD(Digital Video Disk or Digital Versatile Disk) andDigital TV
• It is designed for video compression between1.5 and 15 Mbps
• MPEG-2 streams come in 2 forms: ProgramStream and Transport Stream
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Digital TV
• Why use Digital TV instead of Analog TV?– ease of transcoding (changing the same perceptual content by
decreasing quality, but with great gains in bitrate)– ease of storing data for future use and reprocessing– no quality loss (digitized information does not ”change” in time)– ability to supply more services (like MHP, EPG etc)– better and more flexible protection system in commercial TV (encoded
channels)• It has been discovered that there are more television sets than
telephones in the world – huge market• The video and audio information is digitized and compressed using the
MPEG compression standard (source coding)• There are presently three international standards for digital television
– Digital Video Broadcasting (DVB)– Advanced Television Systems Committee (ATSC)– Integrated Services Digital Broadcasting (ISDB)
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Digital TV Standards AdoptionMap
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Model for MPEG-2 Systems
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MPEG-2 Program Stream
• Similar to MPEG-1 Systems Multiplex• Combines one or more Packetised Elementary
Streams (PES), which have a common time-base, into a single stream
• Designed for use in relatively error-freeenvironments and suitable for applicationswhich may involve software processing
• Program stream packets may be of variable andrelatively great length
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MPEG-2 Transport Stream• Combines one or more Packetised Elementary
Streams (PES) with one or more independenttime bases into a single stream (sometimescalled multiplex)
• Elementary streams sharing a common time-base form a program
• Designed for use in environments where errorsare likely, such as storage or transmission inlossy or noisy media
• The transport stream is made of packets withfixed length of 188 bytes
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Packets are idenitifed by PID’sPID= Packet IDentifier, for video, audioand other data: Example: satellite transmission parameters
Frequency,polarisation
Number of QPSK symbols/sec
Error correction rateProgram idenitification numberVideo PIDAudio PID
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The Transport Stream Packet
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DVB• DVB Project is an industry-led consortium of over
300 companies• The DVB Project was launched on 10th
September, 1993• In 1995 it was basically finished and became
operational• There are several sub-standards of the DVB
standard– DVB-S (Satellite) – using QPSK – 40 Mb/s– DVB-T (Terrestrial) – using QAM – 50 Mb/s– DVB-C (Cable) – using OFDM – 24 Mb/s
• These three sub-standards basically differ only inthe specifications to the physical representation,modulation, transmission and reception of thesignal
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About DVB Standard• DVB uses the MPEG-2 Transport Stream to
carry it’s data• DVB has added some features in the MPEG-2
standard (the MPEG standard had a door openfor future additions to the standard)
• Can deliver to the home almost anything thatcan be digitized:– High Definition Television (HDTV)– Standard Definition Television (PAL / NTSC, SECAM)– New broadband multimedia data and interactive
services• Several tables have been added to the MPEG-2
Transport Stream specifications (CAT, EIT etc)
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The MPEG-2/DVB Multiplex
• A multiplex is a bouquet of PIDs containingseveral channels (television, radio, data etc),basically is a collection of programs
• This bouquet contains several types ofinformation (audio data, video data) and aProgram Specific Information (PSI) sectionmade of tables containing the description of thecontents
• Based on the PSI, the decoders can select thecorrect PIDs of the desired program in order todecode them
• All the programs present in the multiplex havedifferent PIDs for their data (audio, video, pcr,subtitle, teletext etc)
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DVB Service Information• DVB-SI provides information to enable automatic configuration of the
receiver to demultiplex and decode the various streams of programs withinthe multiplex
• Program Specific Information (PSI)– Program Association Table (PAT): for each service in the multiplex, the PAT
indicates the location (the PID values of the TS packets) of the correspondingPMT. It also gives the location of the NIT
– Conditional Access Table (CAT): provides information on the CA systems usedin the multiplex; the information is private and dependent on the CA system
– Program Map Table (PMT): identifies and indicates the locations of the streamsthat make up each service, and the location of the Program Clock Referencefields for a service
– Network Information Table (NIT): provides information about the physicalnetwork
• Additional Service Information– Bouquet Association Table (BAT): provides information regarding bouquets– Service Description Table (SDT): describes the services in the system e.g.
names of services, the service provider, etc– Event Information Table (EIT): contains data concerning events or programs
such as event name, start time, duration, etc– Running Status Table (RST): gives the status of an event (running / not running)– Other tables: TDT, TOT, ST, SIT, DIT
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MPEG-2/DVB PID Allocation• PAT always has PID = 0
(zero)• CAT always has PID = 1• EIT always has PID = 18• The PMTs have the PIDs
specified in the PAT• The audio, video, PCR,
subtitle, teletext etc PIDsfor all programs arespecified in theirrespective PMT
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MPEG-2/DVB PSI Structure
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DVB Subtitles• Are carried in PES (themselves being carried in TS)• Timing of presentation is the PTS of the PES (present in the PES
header)• Information is transmitted in graphical format• Pixel depths of 2, 4 and 8 bits are supported• Color information is organized in Color Look-Up Tables (CLUT)• Subtitles are present in a sequence of pages that are going to be
overlayed on the associated video image• A subtitle page contains one or more regions (rectangular areas with
specified sets of attributes: position, width, height, depth etc)• Several regions can be used at the same time (i.e. one region in the
bottom of the screen displaying the subtitle, another in onesomewhere else on the screen displaying some logo)
• There are different events– page update (when only the changed regions from previous page are
present)– page refresh (when all the data needed to display the page is present)
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The Packetised ElementaryStream Packet
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PAT Structure
table_id (= 0x00)section_syntax_indicatormarker_bitreserved (2 bits)section_lengthtransport_stream_idreserved (2 bits)version_numbercurrent_next_indicatorsection_numberlast_section_number
program_numberreserved (3 bits)
program_number = 0 ?
yes
no
network_PID
TS_program_map_table_PID
finished?
no
yes
CRC_32
stuffing_bytes_to_end_of_TS_packet
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CAT Structure
table_id (= 0x01)section_syntax_indicatormarker_bitreserved (2 bits)section_lengthreserved (18 bits)version_numbercurrent_next_indicatorsection_numberlast_section_number
stuffing_bytes_to_end_of_TS_packet
descriptor_tag (=9)descriptor_lengthCA_system_IDreserved (3 bits)CA_PIDprivate_data_bytes
CRC_32finished?
no
yes
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PMT Structure
table_id (= 0x02)section_syntax_indicatormarker_bit ‘0’reserved_bits (2 bits)section_lengthprogram_numberreserved_bits (2 bits)version_numbercurrent_next_indicatorsection_number (=0)last_section_number (=0)reserved_bits (3 bits)PCR_PIDreserved_bits (4 bits)program_info_length
program_descriptors()
stream_typereserved (3 bits)elementary_PIDreserved (3 bits)ES_info_length
ES_descriptors()
finished?
no
yes
CRC_32
stuffing_bytes_to_end_of_TS_packet
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What isMHP
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• FOR MULTIMEDIA ORIGINATING FROM DIGITAL TELEVISION APPLICATION DEVELOPMENTPLATFORM IS MHP – MULTIMEDIAHOME PLATFORM DEVELOPEDBY EUROPEAN DVB ORGANISATION
IT WAS ACCEPTED FOR NORDIC COUNTRIES IN MARCH 2001
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DVB in the home
INTERACTIVE INTERACTIVE
DVB-S
DVB-MSDVB-MC
DVB-C
DVB-T
Integrated Receiver-Decoder (IRD)
B-ISDN, ASDL, PSTN, GSM
DVD DVC
PC
SDTV / EDTV / HDTV
DVB – Digital Video Broadcasting, covers digital TV deliveryby S - satellite, C- cable and T- terrestrial plus networking
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The Uses of DVB - a Scenario
Cable / (S)MATV
Terrestrial
TV Receiver Multimedia PC
Satellite
Reception
Integrated ReceiverDecoder (IRD)
B-ISDNADSL etc.
DVD etc. DVC etc.
MultichannelMicrowaveDistribution
System (MMDS)
InteractivityBroadcast
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1998 1999 2000 2001
TV
PC
Convergence of Application Domains
WWW(limited
graphics)
WWW(enhancedfeatures)
Interactive Multimedia
Home Services
Video Conferencing
Full Internet Access(ftp, WWW, e-mail, ..)
Internet Telephony
Audio onDemand
Broadcast
Interactive
TV with increasing processing
PCwith DVBDecoder
HomeShopping
PPV
EPG
Internet Telephony
Interactivity
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• The Multimedia Home Platform consists of a userterminal including all possible low- to high-functionality implementations, its associatedperipherals, and the in-home digital network.
• The MHP solution encompasses the whole set of technologies necessary to implement the MHP including protocols, common languages (API), interfaces, and recommendations.
• The MHP supports several levels of interactiveservices / applications. These are defined as:– Enhanced broadcasting (including local
interactivity)– Interactive broadcasting (using a return channel)– Internet access
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The Scope of MHP
Generic SW Interface (API)
• Independent developers• Different service
providers• Various application areas
•• Independent implementationsIndependent implementations•• Different hardwareDifferent hardware•• Different softwareDifferent software•• All kind of terminalsAll kind of terminals
(low(low--end STB / highend STB / high--end PCend PC)
Applications
MHP Terminals
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• To deliver bridging between• hardware and software worlds• consumer and computer worlds• existing and future business environment
• thus providing an evolution• from today´s fragmented vertical markets• to future unfragmented horizontal markets
Objectives for Standardization
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Some of the key MHP requirements• User friendly
Affordability, appropriate lifetime, interoperabilityDesigned for all, improving the user experience, customisationProtecting privacy e.g. no unauthorized access to personal data or
parental control signaling• Market friendly
Open standards, Stable, reliable, evolutionary, compatible with CA-systems, Compatible with copy management and content protection
Performing at least as well as proprietary solutions and supporting migration
• Innovation friendlyInteractivity, secure transactional servicesInternet links and / or full access
• Regulation friendlyNational or international e.g. Respect of power consumption strategies
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• Enhanced Broadcasting with local interactivitybenchmark applications• built-in navigator• EPG
• Interactive Services using a return channel
• Internet Access
Application Oriented Requirements
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•• Equipment (hardware, software)Equipment (hardware, software)•• home terminal / receiver home terminal / receiver
set top box, integrated TV set, multimedia PCset top box, integrated TV set, multimedia PC•• local clusterlocal cluster
peripherals, inperipherals, in--home digital networkhome digital network
•• Services / applications (content)Services / applications (content)•• enhanced broadcasting enhanced broadcasting with local interactivitywith local interactivity•• interactive services interactive services using a return channelusing a return channel•• internet accessinternet access
MHP System Definition
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• An Application Programming Interface (API) isused in a terminal device to implement certainfunctionalities that allow hardware-independentdevelopment of content and applications. It allowsdifferentiation in terms of the capabilities of theend user platform.
• The Navigator is the basic user-interface of a terminal device used in the enhancedbroadcasting mode. It is defined by themanufacturer of the terminal device. Each MHP provides a Navigator.
• The Electronic Program Guide (EPG) is thehigher-level consumer navigation device in theenhanced broadcasting mode. It is an applicationwhich can be provided by different parties and may be delivered via the broadcast channel.
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Important other elements:Important other elements:•• SecuritySecurity
•• operationoperation•• content, content, •• user data, transactions etc.user data, transactions etc.
•• Local ClusterLocal Cluster•• Copy Management & ProtectionCopy Management & Protection
•• levels, signallinglevels, signalling•• operational modeloperational model
•• Conformance & Interoperability TestingConformance & Interoperability Testing•• MigrationMigration
MHP is more than APIs
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content / applications
services / programmes
conditional access
networks / transport
Multimedia Home Platform MHP
verticalvertical marketsmarkets horizontal horizontal marketmarket
AP I
CA
e.ge.g. . dd--boxbox e.ge.g. . CanalCanal++
MultimediaInfrastructure & Value Chain
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Today’s“Horizontal” Markets
Platform 1
API 1
Service Provider 1
Appl. 1 ...Appl. 2 Appl. 3
Service Provider 2
Appl. 4 ...Appl. 5 Appl. 6
API 2
Platform 2
Service Provider 3
Appl. 7 ...Appl. 8 Appl. 9
API 3
Platform 3
API: Application Program Interface
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Future“Horizontal” Markets
Multimedia Home Platform
Implementations ondifferent HW Platforms(Low-Cost STB to High-End PC)"Horizontal Markets"
Service Provider 1
...Appl. 1 Appl. 2 Appl. 3
Service Provider 2
Appl. 4 ...Appl. 5 Appl. 6
Internet
Appl. a . . . Appl. z. . .
Multimedia Home PlatformMultimedia Home PlatformMultimedia Home Platform
API
. . . .
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MHP Market Model
Networks / Transport
A horizontal MarketA horizontal Marketforfor Free und Free und PayPay TVTV
Conditional Access
Programmes & Services
Applications & Content
Receivers / Terminals
Operator 2 Operator 3Operator 1
Provider 1 Provider 3Provider 2
CompetitionCompetition in all in all layerslayersof of valuevalue chainchain
Operator 1 Operator 2
Supplier 1 Supplier 2 Supplier 4Supplier 3
Manuf. 4Manuf. 1 Manuf. 2 Manuf. 3
Vertical businesses in a horizontal marketVertical businesses in a horizontal market
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Typical MHP Applications• Electronic program guides• “Super Teletext”• Applications synchronised to TV content• Games• E- commerce• Interactive advertising• Internet access
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Examples for MHP applications
E-Commerce and Secure Transactions
Applications synchronised to TV Content(score cards, local play-along games)
Information Services (“super teletext”,news tickers, stock tickers)
Electronic Program Guides(EPG)
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Example of a MHP-based Electronic Program Guide
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ZDF.vision EPG
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Application Synchronised to TV ContentGolf Game
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• Upon entering enhanced content, video scales.
• While viewing, audio/video continue to be available.
Interactive Advertising
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• Select a product. Learn more about it.
Easy navigation using scroll bar to select product from range
••Make a purchase decisionMake a purchase decision
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• And complete the transaction!
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Top of the Pops
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Airport Information System
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Airport Information System
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Commercial RequirementsCommercial
Requirements
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Commercial Requirements Overview
GenericGeneric RequirementsRequirements
Enhanced Broadcasting
Interactive Broadcasting)
ApplicationApplicationBasedBasedRequirementsRequirements
Security Model
Conformance & Interoperability Testing
Local Cluster
Copy Management & Protection
otherother
Internet Access
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•• interoperabilityinteroperability•• evolution, scalability, backwards compatibilityevolution, scalability, backwards compatibility•• modularity, stabilitymodularity, stability•• migration pathmigration path•• based on open standards based on open standards •• upgradabilityupgradability / / downloadabilitydownloadability•• controlled development pathcontrolled development path•• simplified and cost controlled operation simplified and cost controlled operation
bandwidth efficient format: separation of data from applicationsbandwidth efficient format: separation of data from applications
•• generic API separated from CAgeneric API separated from CA
Key Generic Requirements
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Technical Specification
Technical Specification
IMPORTANT!
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MHP Specification Overview• MHP1.0 formally accepted by ETSI
– Enhanced Broadcasting– Interactive Broadcasting
• MHP1.1 – Internet Access
• Based on DVB-Java• HTML / XML
– optional for Enhanced & Interactive Broadcasting – part of Internet Access profile
• Existing (legacy) APIs to be handled as plug-ins
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Specification Elements (1)
• MHP architecture
• Detailed profile definition enhanced and interactive broadcasting
• Content formatsincluding PNG, JPEG, MPEG-2 Video/Audio, subtitles and resident and downloadable fonts
• Mandatory transport protocolsincluding DSM-CC object carousel (broadcast) and IP (return channel),
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MHP MHP APIAPI
MHP Architecture (1)
I/O Devices CPU
MPEG Processing Graphics
BroadcastBroadcastChannelChannel
InteractionInteractionChannelChannel
Transport Protocols
Virtual Machine
Application Manager(Navigator)
APIsSystem Software
Resources Memory
Application 1
ApplicationsApplication n. . . .
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LOADER
Middleware
Operating System
Drivers
Hardware
Appl. 1
e.g. EPG
Appl. 2
e.g. Game
Appl. 3 e.g. Home-shopping
Appl. n
CA
A P I
Applications
MHP Architecture (2)
CondCond. Access . Access separatedseparatedfrom APIfrom API
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Reference Model of the MHPThe architecture of the MHP is
described by 3 layers:
Hardware and Software Resources
System Software
API
Interope-rable
Applica-tion 1
Interope-rable
Applica-tion 2
Interope-rable
Applica-tion 3
Interop. Applica-
tionLibrary
PossibleControlApplica-
tion
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Internet Access
Java APIsfor Internet access
HTML, ECMA script,DOM, CSS, ...
MHP 1.1
Broadcast TransportProtocols: IP
MHP Profiles
Interactive Broadcast
API extensionsfor interactivity
Interactive TransportProtocols: IP
"HTML" subset*)Option
*)*) optional element,optional element,MHP 1.1MHP 1.1
Broadcast TransportProtocols: DVB OC
"HTML" subset *)Plug-in
APIs
Enhanced Broadcast
Java VM
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Specification Elements (2)• Application model and signalling• Hooks for HTML content formats • DVB-J platform
DVB defined APIs and selected parts from existing Java APIs, JavaTV, HAViand DAVIC
• Security frameworkbroadcast application or data authentication return channel encryption (TLS)
• Graphics reference model• Annexes
DSM-CC OC profile, text presentation, minimum platform capabilities, various APIs
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MHP based on a DVB Java Platform
Hardware-Ressources
System Software (Operating System, Drivers, Firmware etc.)
MHP API
Interoperable Java Applications
Java Virtual Machine
“Core”Java APIs
“Digital TV”Java APIs Others ?
ControlApplication(Navigator)
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DVB-J Platform
OS, drivers, firmware, ..
Java Virtual Machine
Interoperable Application
Trans-port
Proto-col(s)
MHP API
DVB specificAPIs
Sun JavaAPIs
DAVICAPIs
Data
HAViAPIsApplication
Manager(Navigator)
InteroperableApplication
(and libraries)
System Software
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OS, drivers, firmware, ...
MHP API
Java Virtual Machine
DVB specificAPIs
Sun JavaAPIs ...Application
Manager(Navigator)
PlugPlug--inininterfaceinterface
LegacyAppl. A
Plug-inA
Plug-inB
LegacyAppl.
B
InteroperableJava Applications
(and libraries)
PlatformPlatformspecific plugspecific plug--inin
"Interoperable""Interoperable"plugplug--inin
Trans-port
Proto-col(s)
DVB-J Platform with Plug-ins
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Lifecycle DVB-J Application Signalling
Active
pauseXlet()
startXlet()initXlet()
PausedLoadedStart
DestroyeddestroyXlet() destroyXlet()
destroyXlet()
• Application Signalling– Extension to DVB-SI
– Dedicated tables (AIT, VST)
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Security Framework
MHP
CertificationAuthority
Manufacturer
Publish RootPublish RootCertificateCertificate
Store RootStore RootCertificateCertificate
AuthenticatedAuthenticatedApplicationsApplications
CertificatesCertificates
BroadcastBroadcast
Broadcaster
InteractiveInteractive
MHP
Server
EncryptedEncryptedCommunicationCommunication
?
!
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MHP EVOLUTIONNext Steps in DVB
MHP EVOLUTIONNext Steps in DVB
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Technical Extensions
Storage
BroadbandInternet
In-Home Digital Network
Building on MHP 1.1, add the followingBuilding on MHP 1.1, add the following ...
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MPEG2 Network Operators
MPEG2 Network OperatorsIP Network
Operators
IP Network Operators
ContentProducers
ContentProducers Content
Distributors
ContentDistributors Service
Providers
ServiceProvidersBroadcasters
Broadcasters
The Internet is leveling the playing fieldThe Internet is leveling the playing fieldContent
ProducerContent
DistributorServiceProvider
MPEG2 Network Operator
Broadcaster
IP Network Operator
“More Content is more King ?”
�
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Consumer
Content Flow in a Broadband WorldContent Flow in a Broadband World
ConsumerConsumer Consumer
ContentProducers
ContentDistributors
ServiceProvidersBroadcasters
IP Network Operators
MPEG2 Network Operators
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Vertical businesses in a horizontal marketVertical businesses in a horizontal market
Networks / Transport (MPEG-2 & IP)
Conditional Access(Service Providers)
Programmes & Services(Broadcasters, Web Sites)
Applications & Content(Producers/Distributors)
Receivers / Terminals(CE devices / PCs)
MHP Market Model Evolution
All competing for consumersAll competing for consumers
Operator 2 Operator 3Operator 1
Provider 1 Provider 3Provider 2
Operator 1 Operator 2
Supplier 1 Supplier 2 Supplier 4Supplier 3
Manuf. 4Manuf. 1 Manuf. 2 Manuf. 3
Operator 4
Operator 3 Operator 4
Operator 2 Operator 3Operator 1
Provider 1 Provider 3Provider 2
Operator 1 Operator 2
Supplier 1 Supplier 2 Supplier 4Supplier 3
Manuf. 4Manuf. 1 Manuf. 2 Manuf. 3
Operator 4
Operator 3 Operator 4
BottomUp
“Pull”Trad.Net
ConsumersConsumersChooseChoose
TopDown“Push”Trad.TV
BroadcastersPush
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MediaHighwayOpen TVMHEG-5
d-Box
DVB-SI
Programmes MPEG-2
Enhanced Dig ita l Television & Radio
Appl ications
Multimedia Home Platform
• DVB pioneering phase resulted in several proprietary APIs associated to proprietary CA systems
• DVB-MHP is building the IRD of the future– a platform for convergence– overcoming market fragmentation
API Systems
A / V Coding
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Infostructure
Infrastructure
Network A Network B
APIAPIIn-homeNetwork
Consumer
CA
MHPLocalCluster
Content &Services
Enhanced Broadc.Interactive Serv.Internet Access
Home TerminalSet Top Box, TV, PC
Peripherals
MHPFrom Infrastructure to Infostructure
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System Software(OS, drivers, firmware, ...)
"MHP API"
Java Virtual Machine
"Digital TV"Java APIs
”Core"Java APIs ...
ApplicationManager
(Navigator)
Plug-inInterface
LegacyAppl. A
Plug-inA
Plug-inB
LegacyAppl.
B
InteroperableJava Applications
(and libraries)
Platformspecific plug-in
"Interoperable"plug-in
Trans-port
Proto-col(s)
DVB-J Platform with Plug-ins
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Internet Access 1
DVB-J APIsfor Internet access
DVB MHP HTML:XHTML, ECMA script,
DOM, CSS, ...
Broadcast TransportProtocols: IP
Interactive Broadcast 1
DVB-J extensionsfor interactivity
Interactive TransportProtocols: IP
"HTML" subset *)Option
*) optional element
EB: local interactivityIB: return channel
Enhanced Broadcast 1
Broadcast TransportProtocols: DVB OC
"HTML" subset *)Plug-in
DVB-J APIs
Java VM
DVB MHP’s Application Areas & Profiles
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User Interface Development (1)• MHP uses the standard 'java.awt' package
– Based on lightweight components & JDK 1.1.x event model.
– No "classical" UI widgets - too text based for TV
• Extensions :-– org.dvb.ui.DVBColor provides transparency
(e.g. seeing through graphics to video)– org.dvb.ui.DVBTextLayoutManager allows
simple display of formatted text
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User Interface Development (2)
• Your application can get its first & top level UI container in 2 ways.– javax.tv.graphics.TVContainer.getRootConta
iner()• Returns an invisible {0,0} size container• Applications have to size & position the container
by hand and test the results to see what happens.
– Methods on org.havi.ui.HSceneFactory• Allow applications to be more expressive about
what they really want than getRootContainer().
• No requirement for a windowing system
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User Interface Development (3)• The org.havi.ui package
– Widget sets.• Graphic based not text based like the ones in java.awt• HNavigable.setFocusTraversal() allows applications to
describe a focus navigation map (up/down/left/right)
– Device framework• HScreenDevice & sub-classes allow applications to access a
model of the graphics, video & background devices in a system
– Extra key codes for remote controls• org.havi.ui.event.HRcEvent extends awt.event.KeyEvent
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User Interface Development (3)
• Several different ways of approaching this in your applications.– Draw everthing using awt.Graphics primitives– Define your own lightweight components extending
java.awt.Component.• Can implement org.havi.ui.HNavigable for extended
navigation
– Use the HAVi widget set• Can define your own appearance if you need.
• Start this early in your process– Test it on TVs & with TV remote controls very early
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Controlling Video & Audio (1)• Applications can do basic control of video and
audio with the Java Media Framework.– Based on JMF 1.0– Uses 'dvb:' URLs to select what to show
• Applications can obtain running JMF players.– Needed for applications running as part of a TV service
to get access to already running a/v.– See javax.tv.service.selection.ServiceMediaHandler
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Controlling Video and Audio (2)
• MHP provides a number of extra JMF controls– For video scaling...
• javax.tv.media.AWTVideoSizeControl (simple)• Org.dvb.media.BackgroundVideoPresentationControl
(flexible)• Platforms aren't required to support unlimited video scaling
– Control and monitoring of subtitles, service components
– Fine control over audio playback from memory• org.davic.media.MediaTimePositionControl
– Notification of changes in incoming TV signals• video size, aspect ratio, ...
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Synchronising Apps. To Video• DSMCC stream events
– These need to be injected by the broadcaster.– Can fire immediately or at a specific time– Applications can listen for them with these APIs
• org.dvb.dsmcc.DSMCCStreamEvent.subscribe()• org.davic.media.StreamEventControl.subscribeStreamEvent()
• Other possible solutions– org.davic.media.MediaTimeEventControl– Using org.davic.mpeg.sections as described above
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Electronic Programme Guides (1)
• Access to broadcast service information– DVB-SI API - org.dvb.si
• Gives access to all the low level detail of DVB-SI for those who know how to use that.
– JavaTV SI API - javax.tv.service, javax.tv.service.guide• A high level abstract view
• Many broadcast networks don't follow the DVB-SI specification very well or very completely.– You really need to know what you're doing here.
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Electronic Programme Guides (2)
• Previewing a TV service– Using JMF, an EPG can preview a TV service
without starting any associated applications.• Really selecting a TV service (incl.
applications)– Use
javax.tv.service.selection.ServiceContext.select()– Can obtain service contexts from
ServiceContextFactory– Calling select() on your ServiceContext may kill you!
• If your EPG needs to run on a group of services,
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Security & Signed Applications• Does your application need to be signed &
authenticated?– Many MHP features need applications to be signed &
for the signature to be authenticated.– Use of the return channel (i.e. modem)
• Make connection, specify phone number to dial, read current phone number settings, ...
– Tuning & service selection• MHP uses Java 2 fine grained security model.
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Non-Broadcast Networks
• Uses 'java.net' for access to "normal" IP based networks (e.g. internet or private network)– Called 'return channel' or 'interaction channel' in
DVB• For a secure channel over to a server ...
– use JSSE as an API to SSL (equiv to an 'https' URL).
• For control of the return channel, use org.dvb.net.rc– Allows monitoring of connection state (e.g. phone
call interrupted)– Allows specifying your own phone number
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Application Environment
• MHP services can include multiple applications– Your application may need to execute at the same
time as other applications in that service (e.g. an EPG).
• Many MHP APIs support resource negotiation– Apps implement org.davic.resources.resourceClient
• Apps can use org.dvb.event to request access to specific user input events – Also notification when you have it and when you
don't.• Your application needs to think about this
– Otherwise you may have problems selling your app!