UPnP AV Architecture - Generic Interface Design And Java Implementation Andreas BobekUniversity of...

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UPnP AV Architecture - Generic Interface Design And Java Implementation

Andreas BobekUniversity of Rostock

Faculty of Computer Science and Electrical Engineering

Andreas Bobek, Hendrik Bohn, Frank GolatowskiUniversity of Rostock

Parallel and Distributed Computing and Networks – PDCN 2005 –as part of the

23rd IASTED International Multi-Conference onApplied Informatics

15th – 17th February, 2005, Innsbruck, Austria

UPnP AV ArchitectureGeneric Interface Design And Java Implementation

University of Rostock

Andreas Bobek

Outline

1. UPnP Audio Video

1.1. UPnP Device Architecture

1.2. UPnP Stack

1.3. UPnP AV Architecture

1.4. UPnP AV Data Flow

2. AV Interfaces

2.1. AV Interface Examples

2.2. AV Interface Stack

2.3. Application Code Examples

3. Further Work

2.4. Advantages

3.1. AV within SIRENA project

3.2. Generalisation

Andreas Bobek

Outline

1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

- UPnP = Universal Plug and Play

- supports ad-hoc networking of devices and services

- only protocols are defined (UDP, TCP, SOAP, SSDP, GENA, HTTP)

- independent of programming language, operating system and transmission medium

- six phases: addressing, discovery, description, control, eventing, and presentation

- defines three communicating components: device, service, control point

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- role: server

- offers services

- may contain other devices

- “root device”

- characterized by properties such as model number, model name, vendor...

- uniquely identifiable by UUID

UPnP Device

UPnP Service

- interface to the device

- offers actions and URLs for controlling, eventing, and presentation

- manages its state in state variables

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- role: client

- searches for devices and/or services

- invokes actions (at services)

- requests state variables

UPnP Control Point

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UPnP Device (Server)

UPnP Service

UPnP Control Point (Client)

UPnP network

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

1.2. UPnP Stack

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UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA

1.2. UPnP Stack

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UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA

UPnP Device Architecture(Addressing, Discovery, Description, Control, Eventing,

Presentation)

1.2. UPnP Stack

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UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA

Presentation)

Standardized DCPs(by UPnP Forum)

1.2. UPnP Stack

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UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA

Presentation)

Standardized DCPs(by UPnP Forum)

Audio Video Architecture

Lighting Controls

Printer Device

Internet Gateway Device

1.2. UPnP Stack

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

MediaRenderer Device

• play back of multimedia content

• e.g. Windows Media Player, TV, beamer

MediaServer Device

• manages meta data of multimedia files and streams

• meta data consist of information about format (mpg, jpg, avi...), owner, permissions, date, size, access protocols ...

• PC, tuner, digital camera

Control Point

• searches for MediaServer and MediaRenderer

• initiates connections

• controls play back (play, stop, brighter, louder...)

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MediaRenderer Device

RenderingControl Service

ConnectionManager Service (opt.)

AVTransport Service (opt.)

MediaServer Device

ContentDirectory Service

ConnectionManager Service (opt.)

AVTransport Service (opt.)

Control Point

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

Control Point

Media Renderer

Media Server

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1. Search RequestControl Point

Media Renderer

Media Server

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2. Search ResponseControl Point

Media Renderer

Media Server

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Control Point

Media Renderer

Media Server

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3. Browse()Control Point

Media Renderer

Media Server

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4. Result

• DIDL Lite (XML)

• preconditioned protocols

• file formats...

Control Point

Media Renderer

Media Server

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5. GetProtocolInfo()Control Point

Media Renderer

Media Server

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6. supported protocols, accepted formats

Control Point

Media Renderer

Media Server

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7. matching between preconditioned and supported protocols

Control Point

Media Renderer

Media Server

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8. PrepareForConnection()Control Point

Media Renderer

Media Server

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9. SetURI()

Play, Pause, Stop...

Control Point

Media Renderer

Media Server

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10. Data transport

(„out of band“)

Control Point

Media Renderer

Media Server

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

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<< interface >>MediaServer

<< interface >>ProxyMediaServer

<< interface >>HostedMediaServer

<< interface >>MediaDevice

<< interface >>MediaRenderer

<< interface >>ProxyMediaRenderer

<< interface >>HostedMediaRenderer

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<< interface >>AVTransportInstance

+ setAVTransportURI( current_uri: String, current_uri_meta_data: String): void

+ stop(): void

+ play(speed: String): void

+ next(): void

+ getMediaInfo(): GetMediaInfoResult

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

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Vendor UPnP Stack

Vendor AV Stack

Vendor Factory Class

AV Interfaces

Supportuses(opt.)

impl.impl.

usesuses(opt.)

AV Application

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

UPnPAVFactory factory = new UPnPAVFactoryImpl();

MediaControlPoint cp = factory.getMediaControlPoint(

new MediaControlPointListenerImpl()

cp.start();

cp.searchForMediaRenderers();

cp.searchForMediaServers();

Control Point

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Control Point

public class Listener implements MediaControlPointListener{ public void takeMediaServer( ProxyMediaServer p_server, MediaDevice p_parent_device ){ // access proxy services ProxyAVTransport avt = p_server.getProxyAVTransport(); ProxyConnectionManager cm = p_server.getProxyConnectionManager(); ProxyContentDirectory cd = p_server.getProxyContentDirectory(); // browse content directory BrowseResult browse_result = cd.browse( "0", ContentDirectory.BROWSE_FLAG_BROWSE_METADATA, "*", 0, 0, "" ); DidlLiteModel model = new DidlLiteModel(); String result = browse_result.getResult(); Element el_didl = XMLUtil.stringToElement(result); }

Andreas Bobek

1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

2.4. Advantages

Why to use an interface layer:

- separate development of stack and application

- replacement of UPnP stack without modifying application code

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1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

Andreas Bobek

- SIRENA = Service Infrastructure for Real time Embedded Networked Applications

- part of the ITEA program

- modify current AV Architecture:

- extension by integrating QoS aspects

- adapt architecture to fit small embedded devices

Andreas Bobek

1. UPnP Audio Video

1.2. UPnP Stack

2. AV Interfaces

3. Further Work

2.4. Advantages

3.2. Generalisation

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3.2. Generalisation

- analyzing service-oriented architecture (SOA) concepts (UPnP, Web Services, JINI, HAVi...)

- designing device protocols independently of specific SOAs

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SOA Interfaces

UPnP Interfaces DPWS Interfaces

AV Interfaces

SiemensUPnP Stack

CyberlinkUPnP Stack

URODPWS Stack

UPnP-SiemensAdapter

UPnP-CyberlinkAdapter

uses uses

impl. impl.

DPWS-UROAdapter

SOA-UPnP Adapter SOA-DPWS Adapter

uses uses

impl.impl.

AV-SOA Adapter

Air Condition Interfaces

AV Application

Air Condition-SOA Adapter

Air Condition Application

3.2. Generalisation

UPnP AV Architecture - Generic Interface Design And Java Implementation Andreas BobekUniversity of...

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