Transcript 投影片 1

Introduction of IPTV and MHP
Speaker: 簡怡婷
2015/4/13
Outline
Introduction of IPTV
What is IPTV – Definition
IPTV Value Chain
Technique
Introduction of MHP
Introduction of MHP
Basic Architecture
MHP Internal Interfaces
Xlet - MHP Application
MHP Application
IPTV implementation of ISMP
Homework
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What is IPTV - Definition
IPTV (Internet Protocol Television) means a kind
of service platform and system where various
audiovisual multimedia services are delivered
using Internet Protocols over a network
infrastructure.
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Service
Audiovisual multimedia services
TV Broadcast
Pay Per View
Film download
Radio
TV shopping
Interactive Video
Game
…
Communications services
Data and information services
…
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IPTV Value Chain
IPTV value chain is composed of four major players
Content Provider; Service Provider; Network Provider; Customer
Satellite
Contents
Wireless
receiving system network
Terrestrial content
Security system Wire network
TV program
Value-added
Contents DB
Additional contents processing
system
provider
Notebook
TV
Mobile device
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Technique
DVB (Digital Video Broadcasting)
MHP (Multimedia Home Platform)
OSGi (Open Services Gateway Initiative)
UPnP (Universal Plug and Play)
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DVB (Digital Video Broadcasting)
There are several sub-standard of the DVB
standard :
DVB-S (Satellite)
DVB-T (Terrestrial)
DVB-H (Handheld)
DVB-C (Cable)
IPTV
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DVB in Taiwan
DVB-T
DVB-H
Delivered at 2007
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Introduction of MHP
Multimedia Home Platform (DVB-MHP) is an open
middleware system standard designed by the DVB
project for interactive digital television
MHP solution encompasses the whole set of
technologies necessary to implement, including protocols,
common languages (API), interface, and
recommendations.
The main purpose of MHP is to provide a common
interface for multimedia application (Xlet) on the digital
TV platform.
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MHP Software stack
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Basic Architecture
MHP model consider three layers
Resources
System software
Applications
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Basic Architecture
Resources
Hardware entities
MPEG processing, I/O devices, CPU, memory and a graphics
system
System software
Middle layer isolates the application from the hardware, enabling
portability of the application
Uses the available resources in order to provide an abstract view
of the platform to the applications
Implementations include an application manager (“navigator”) to
control the MHP and the applications running on it
Applications
Interactive services as software running in hardware entities
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MHP Internal Interfaces
Audio
output
Video
output
+
Remote control / keyboard/
Mouse input
Graphics
Storage Media
Control
User Interaction
API
Media
Decoder
Media
Control
Application
CA
Turner
control Control
MPEG-2
Section
Filter
Service
Information
Remote
Program
TCP/IP
DSM-CC
Others
Over
UDP/IP
Demux
CA
Interaction
Channel
Turner
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Network
Broadcasting Chain
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Transport Stream Elements
An elementary stream is a
sequence of packets
containing video, audio or
some other type of data.
Each service is a collection
of one or more elementary
streams.
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PSI/SI
Video, audio and other data are all interleaved
when transmitted on a single Transport Stream
(TS).
These separate sources of data are identified
with a unique packet identifier (PID).
Program Specific Information (PSI) is defined as
a part of MPEG-2 standard.
Service Information (SI) is an addition to the PSI
specification.
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PSI
PSI defines four different tables.
Program Allocation Table (PAT)
Program Map Table (PMT)
Conditional Access Table (CAT)
Transport Stream Descriptor Table (TSDT)
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SI
SI defines four mandatory tables.
Network Information Table (NIT)
Service Description Table (SDT)
Event Information Table (EIT)
Time and Date Table (TDT)
SI defines four optional tables.
Bouquet Association Table (BAT)
Running Status Table (RST)
Time Offset Table (TOT)
Stuffing Tables (ST)
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DSM-CC
MHP applications, data and events are
broadcasted using a DSM-CC layout system.
The application and data are sent on an object
carousel, while events are sent as stream events.
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DSM-CC Object Carousel Layering
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Conditional Access System
Conditional Access System (CAS) is used to
control the access to program content.
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Xlet - MHP Application
An MHP application is an interactive application
written by Java.
Called Xlet
Run on top of the MHP middleware
Specific lifecycle (started, stopped, paused, and
resumed)
The states changes of an Xlet are handled by the Xlet
itself. Xlets communicate with the application manager
about state changes via callback.
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Xlet Lifecycle
Loaded – loaded but not initialized.
Paused – minimizes its usage of resource.
Active – working and providing instance.
Destroyed – released all its resource and
terminated.
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Basic API – Java
DVB creates a lightweight version suitable for
broadcast applications called DVB-J.
Based on a subset of Personal Java 1.2
Add several major parts, such as STB-specific
functions
UI model reflects the consumer
Changes in the core Java classes to save memory
space
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Extension API
JavaTV API
Xlet classes and infrastructure
Service selection
SI/PSI access
DAVIC API
Basic MPEG concepts
Tuning between transport streams
MPEG-2 section filtering
Resource management
Access to CA information
HAVi API
Video/graphics integration
UI widgets for consumer systems and TV screens
Solutions for hardware restrictions related to video and graphics integration on TV screen
3 layers:
Background layer
Video layer
Graphic layer
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MHP Application
Electronic Program Guides (EPG)
Information service
E-commerce and T-Games
Education service
E-mail and internet
…
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E-commerce and E-Games
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Education service & E-mail and internet
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IPTV implementation of ISMP
framework
Virtual
Service
Provider
TV
Station
modulator card
Tuner
RF
USB
STB
Internet
Wireless
UPnP
Devices
Wired
HDMI
cable
I/O
AAA
Server
HD
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Main Menu
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Electric Program Guide
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Record and Schedules
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Homework
Run a Xlet of openMHP on a linux-like OS
Install MPH platform
Record all the progress you do
Appending pictures is better
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Homework 解說
安裝所需套件
JVM (JDK 1.4 以上版本)
Apache ant ：方便compile xlet
JavaTv （ Javatv 1.0 ）：提供API給數位電視平台
OpenMHP ：提供PC的open source的 MHP平台
其他套件
JMF 2.1.1 : JAVA library ,用來對java 應用程式增加
audio, video 和其它time-based media
(5)ImageMagick 5.5.7:
注意環境變數設定
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Reference
http://www.interactivetvweb.org/tutorials/javatv
附上openmhp1.0.4：
http://140.116.82.51:8081/openmhp104_src.zip
帳密與實驗室帳密相同
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