Development and Implement of an Embedded Video-on-Demand Application

Outline

Video On DemandVOD ( Video On Demand )

(CD-TITLE)VCDLDCD

Video On Demand (2)

Embedded VOD System:

:

The VOD serverThe transport networkThe end user

(2)The end user:

Intel StrongARM

Embedded Linux Qt/Embedded GUI

VideoLAN Client (VLC) video streaming

PCMCIA Slot Wireless CF Card

(3)

(4)

(5)(Server):

Redhat Linux 9.0 TCP/IP client-server socket

VLC

MySQL

(6)VOD

(7)The transport network:

(8):

(Video On Demand, VOD)

TCP

(Streaming)

RTP UDP

(9)

(Multicasting)

MP3

(10)

VOD

::

:

Outline

--- (Customize)

PDA(Set-Top-Box, STB)

MPUASIC

CPU

Embedded LinuxEmbedded LinuxLinux Linux

Linux

? --- Boot image , kernel image , filesystem

Flash Memory

Powers upReset:

BootMemoryProcessorRegisters

Interrupt controllerinstallInterrupt handler

peripheral devices

(2) Loader Boot image

kernel image SDRAM

kernel start_kernel()

kernel Kernel objects services --- Task objects ,Timer services , Memory-Management services

Load

filesystem Starting initial tasks

--- Cross Complier

--- arm-linux-gcc x86ARM cross-compiler

/

---

(2)GNUARMcross-compiler

GCC C/C++ compilercross-compilerC ARM

Binutils ARMARM

GLIBC C runtime library

ftp://ftp.gnu.org/gnu/ GNU(ToolChain)

/ :

(Linked setup) (Removable storage setup)

(Linked setup)

Ethernet

---

SeriesEthernet**Bootlodar*Kernel* filesystem/

(2)

(TFTP) Kernel (NFS)

Ethernet

RS-232

(3)(Removable storage setup)

*Bootlodar* Kernel* filesystem*

Outline

Cross-development tool

cross-complier binary utilities --- toolchain

arm-linux-ld , arm-linux-as , arm-linux-gcc , glibc

arm-linux

:

Binutils Gcc Glibc

:

1. 2. 3. 4.

Binutils

Gcc

Glibc

* PATH=/usr/local/arm

Outline

:

GUI

socket/

(Concurrent server)

I/Oread()write()

GUI GUI --- Qt/Embedded

Qt

FrameworkC++

(Framebuffer) framebuffer X

(class)

TCP/IP socket , QNetworkProtocol

Qt/Embeddedqvfb

Qt/X11 & Qt/Embedded

GUIQt/Embedded GUI:

Qt Designer GUIinterface file (.ui)

Qt user interface compiler (uic) .cpp .h

Qt progen tmake .pro Makefile

Makefile

Qt

qvfb

(MySQL)

/

MySQL :

: mysql_init( ) : mysql_real_connect( )

MySQL :

:VLC

: SDL(Simple DirectMedia Layer)VLC

SDL framebuffer

MAD(MPEG Audio Decoder) MAD

SDL SDLQt/EmbeddedqtopiadriverFramebuffer

filesrc/video/qtopia/SDL_QWin.csrc/video/qtopia/SDL_sysevents.csrc/video/qtopia/SDL_sysvideo.c

Configure SDL (configure)SDLMakefile arm-linux-sdl-config (script) (SDL-lib)

Configure MADmad-0.14.2bVideoLAN Client

Configure VLC vlc-0.5.2

Makefile

802.11bSENAOWireless Compact Flash CardPCMCIAdriverLinuxStrongARM

: server client

: server multicasting client

MP3

PC

Video Video Frame Size320x240Frame Rate (fps)23.976Video CodecMPEG-1InterlacingNon-InterlacedAspect RatioVideo:[4:3], Pixel:[1:1]CBR/VBR TypeCBRVideo Bitrate(kbps)500~1152Audio Sample Rate(kHz)32.000Audio Bitrate(kbps)128ChannelsStereo