TranService: Service and Media Translation System for Small Devices

Graduate School of Media and Governance, Keio University

Jun’ichi Yurayurayura@ht.sfc.keio.ac.jp

Outline

Background and Goal

System Overview

Implementation

Evaluation

Future works

Conclusion

Background

Variation of ServicesWeb, Database, news ...

Variation of DevicesPC/WS, PDA, WC …

web

DB

news

PC

PDA

Phone

→ Can not use the services.

→ Can not get data suitable

for the devices.

Need to consider the difference of devices and services

Goal

Service and media translation system,

which consider the difference of

devices and services.

Movie ServerCellular Phone

POWERED BY

Device Transparency

Consider the difference among devicesTranslation based on device QoS profile

PC/WS

PDA

Phone

Web Server

Service Transparency

Consider the difference among servicesTranslation based on service QoS profile

Web Client

web

movie

mail

QoS Profile

Request contents of QoS(Quality of Service)Data profile

Data type, Data format, Data quality

E.g., image/gif (depth: 8bit, size: 180x180)

audio/au (frequency: 44.1KHz)

Protocol profileProtocol type, Protocol information

E.g., HTTP (Accept: image/gif)

TS-Proxy

Is proxy server for TranServiceData transcodingProtocol conversionAutomatic and dynamic transcodingLoads modules dynamically

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Device Module Part Service Module Part

Translation Module Part

ServiceDevice

Request C

Reply C

Request S

Reply S

TS-Proxy

Con

trol

ler

HTTP

RTSP

POP

SMTP

Action Sequence

Con

trol

ler

Con

trol

ler

Device Module Part Service Module Part

Translation Module Part

HTTP

RTSP

POP

SMTP

HTTPSMTP TEXT JPEG

GIFMPEGJPEG

Client SMTPServer

HTTPRequest Context

Context

SMTPData

Context’

Convert protocols from HTTP to SMTP

Design of QoS Profile

Created by device/service module part

Used by translation module part for dec

iding transcoding pathXML for sending and

receiving

Tree construction in this

system

QOS+ DATA| + IMAGE| | + TBMP| | + COLOR=1| | + DEPTH=0x02| | + WIDTH=180| | + HEIGHT=180| + TEXT| + DEFAULT| + CHARSET=shift-jis+ PROTOCOL + HTTP + VERSION=1.1

Transcoding Types

Protocol conversionHTTP → POP, SMTP → HTTP

Data transcodingimage/jpeg → image/gifimage/au → text/plain

Multiple transcodingtext/html → audio/au= text/html → text/plain+ text/plain → audio/au

Implementation

Implementation environmentJDK1.2 / Windows 2000Whole system about 5000 lines

Implemented modules (extracts)Device modules

HTTP device module

Translation modulesHTTP to POP3 protocol translation moduletext/html to text/plain data translation module

Service modulesHTTP service modulePOP3 service module

Application Example (1)

Controlling networked appliancesSwitching from video inputs to projectors

Use PDA as Universal Controller

PDA Matrix Switcher

Projectors

Video InputsTS-Proxy

SerialHTTP/TCP/IP

CommandsHTML

Application Example (2)

Browsing support for video streamingCelluar phone:GIF(8bit-GlayScale, 100x8

0) PC: JPEG(24bit-Color, 320x240)

Internet-ready cellular phone PC

Related Works

W M T D S

Service Transparency

Dynamic adaptation No No No No Yes

Extended functionality No No No Yes Yes

Multiple transcoding No No No No Same

Platform independency Yes Yes No No Yes

Device Transparency

Dynamic adaptation Same Yes Yes No Yes

Extended functionality Yes Yes Yes Yes Yes

Multiple transcoding Same No No No Yes

Platform independency Yes Yes No No YesW:WBI, M:KMSF-MCAP, T:TranSend, D:DeleGate, S:tranService

Measurement

1: Measure entire timeA: Receiving data from client, create QoS profile

D: Receiving data from server

2: Measure time taken by transcodingTranscoding time: 1.2 msec/num

Decision time: 0.7 msec/num

0 10 20 30 40 50 60

Tim

e (m

sec)

A

B

C

D

E

F

G

0

50

100

150

200

0 10 20 30 40 50

Whole

Transcoding

Decision

Numbers of modules

Tim

e (m

sec)

Graph 1 Graph 2

Future Works

Use distributed modulesLoad balancing, fault tolerance

Interoperability to other QoS profilesMPEG7, CC/PP, HTTP-UserAgent

Categorize service characteristicsState-less or state-full

Number of connections

Conclusion

Construct tranService system, which is media transcoding system based on QoS requirements of devices and services

DesignRealize device transparency and service transparency

ImplementationImplemented on JDK1.2

EvaluationMeasurement

Comparison

Application Example (2)

Web mail readerUsers can read web pages by mail-reader

TS-Proxy convert from SMTP to HTTP

PDA TS-Proxy

HTTP/TCP/IPSMTP/TCP/IP

Web Server

Example of Moduleimport jp.ac.keio.sfc.ht.tranService.*;

public class TextHtmltoTextPlainTranslationModule extends TranslationWorkerModule

{ public TextHtmltoTextPlainTranslationModule() { // Translation type is Data translation setTranslationType(TranslationServerModule.TRANSLATION_TYPE_DAT

A); // Input type is "text/html" setInputType(new MimeType("text", "html").toString()); // Output type is "text/plain" setOutputType(new MimeType("text", "plain").toString()); } public void execute() { try { // Receiving context Data data = getNextData(); // Here is a transcoding code ... Omitted ... // Sending context sendData(data); } catch(InterruptedException ie) { ... Ommited ... } }}

Context

Data set sent/received between module partsContent

Request from client / reply from server

Content profile

A meta-information of content

Device QoS profile

QoS profile that refer to device

Service QoS profile

QoS profile that refer to service

System Overview

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erDevice Module Part Service Module Part

Translation Module Part

ServiceDevice

Request C

Reply C

Request S

Reply S

TS-Proxy

Related Works

Dynamic adaptationAbility to consider changes of environment dynam

ically

Extended functionalityAbility to accept for new devices and services

Multiple transcodingAbility to transcode continuously

Platform independencyAbility to use system on any platform