software integration for applications with audio stream intelligent information hiding and...

Software Integration for Applications with Audio Stream

Intelligent Information Hiding and Multimedia Signal Processing, 2008.International Conference on 15-17 Aug. 2008 ,pp1126-1129

Advisor : Lian-Jou TsaiStudent : Bing-Fen HuangPPT Production : 100%Data : 2011/12/21

Outline Abstract

Introduction

Software integration through wrapper

Wrapper for stream-based multimedia applications

An example

Conclusion

2

Abstract

We have successfully intercepting/redirecting the data :

Files

Characters

Audio data are a huge number of multimedia applications

today.

Try to build a wrapper module that redirects the audio data.

3

Introduction(1/2)

Commercial Off-The-Shelf (COTS)

For integrating MS-Windows COTS applications into

software systems :

I/O interception/redirection techniques

A programmable interfaces

Message queue and clipboard space techniques.

MS-Windows application GUIs

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The approach can handle only input/output data in forms of

files and character strings.

The video/audio streams are not able to be dealt with.

In order to successfully integrate stream-based applications,

some issues must be considered :

Input and output data

Data stream synchronization

Introduction(2/2)

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Software integration through wrapper(1/2)

The Windows applications are firstly encapsulated by a

wrapper program.

Hides the operation details

A programmable interface(COTS)

Responsible to convert the requests

Gets the output results

Windows applications can exchange data simply through the

Windows Clipboard mechanism.

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Interception and redirection through a Wrapper

Software integration through wrapper(2/2)

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multimedia applications (1/6)

ALSA (Advanced Linux Sound Architecture) is a popular

sound driver/subsystem in Linux 2.6.

In ALSA modules, the playback and capture functions are

already included in its PCM (Pulse Code Modulation)

component.

Wrapper for stream-based

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multimedia applications (2/6)

Wrapper for stream-based

The system structure of ALSA for Linux

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multimedia applications (3/6)

Wrapper for stream-based

Working of ALSA sound driver in Linux(Output)

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multimedia applications (4/6)

Wrapper for stream-based

Working of ALSA sound driver in Linux(Input)

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multimedia applications (5/6)

Wrapper for stream-based

Integration between two audio applications through Wrapper

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multimedia applications (6/6)

Spinlock scheme

ALSA sound modules use the function:

interrupt_handle()

spinlock_irq()

spinunlock_irq()

Wrapper for stream-based

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An example(1/4)

Voice Flight Status Information System (VFSIS)

Integration Skype and ShinxIII

It is composed of a database server and multiple clients distributed on the Internet.

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An example(2/4)

The system structure of VFSIS

15

An example(3/4)The command word analysis and information inquiry

MySQL database

Airlines

Flight Code

Scheduled Arrival Time

Actual Arrival Time

Assigned Gate

Delay Status

VFSIS GUI

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An example(4/4)

The server side VFSIS GUI

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Conclusion(1/2)

The gluing of stream based software applications is a critical technique in

the software integration of multimedia software applications.

We have successfully achieved the goal of intercepting / redirecting the

audio stream data by adopting the wrapper technique.

VFSIS is used to demonstrate the feasibility of our proposed approach.

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Future works

In addition to the issue of video data stream interception

The synchronization issue between image and voice of the video data stream is also a critical issue.

Conclusion(2/2)

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Thank for your attention !