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AC C E S S I C LA B 

Graduate Institute of Electronics Engineering, NTU

Digital Video Recorder Digital Video Recorder 

 Advisor: Prof. Andy Wu

2004/12/16 Thursday

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P2

OutlineOutline

SpecificationSystem Architecture

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SpecificationSpecification

Function:Record NTSC composite video

Video compression/processing

Video playback: NTSC compatible composite

video

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P4

Digital Video Recorder ArchitectureDigital Video Recorder Architecture

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Software HierarchySoftware Hierarchy

Partition software

function blocks: ISR for frame

acquiring/output

ISR for User interface

Message pass inmain process

Library package:

File system

DSP library

Graphical UserInterface

Plan carefully beforedirect access tohardware resource

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Common Video FormatCommon Video Format

Through different interfaces:

 Analog Video Interfaces:

Composite NTSC video

Composite PAL video

S-Video

HDTV RGB video, YUV video

VGA video

Digital Video InterfaceCCIR601 format

CCIR656 format

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What is Composite Video?What is Composite Video? Modulated chrominance is added

to the luminance information

along with appropriate horizontal

and vertical sync signals,

blanking information, and color

burst information, to generate

composite video waveform.

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Video Decoder on EZVideo Decoder on EZ--KITKIT

 ADV7183: A multi-format SDTV Video Decoder 

 Automatically detect standard analog baseband television signal

Support analog input compatible to : NTSC, PAL, SECAM

Convert to 4:2:2 CCIR601/CCIR656 format

Data exchange with Blackfin processor through PPI

Note: PPI connection and Video configuration switch (SW3)

PPI7~PPI0 Connect to Decoder output data, therefore you cannot

choose output CCIR601(16bit) format on EZ-KIT.

SW3 setting:

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Functional Block DiagramFunctional Block Diagram

 Analog

Video

Signal

Digital

Video

Signal

Serial

Control

Interface

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P11

Output FormatOutput Format

How to acquire video sequence through DMA controller?

Refer to \Analog Devices\VisualDSP 3.5 16-Bit\Blackfin\EZ-Kits\ADSP-BF533\Examples\Video Input\C

You can get more introduction to CCIR656 format in ADSP-

BF533 Blackfin Processor Hardware Reference, page 11-14

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Video Encoder on EZVideo Encoder on EZ--KITKIT

 ADV7171: A digital PAL/NTSC Video Encoder 

Support composite, component S-Video, component YUV,

RGB, EuraSCART, YUV + Chroma video format

Support 4:2:2 CCIR601/CCIR656 format

Serial MPU control interface (I2C compatible)

Data exchange with Blackfin processor through PPI

Note: PPI connection and Video configuration switch

(SW3), the same as ADV7183

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Functional Block DiagramFunctional Block Diagram Analog

Video

Signal

Serial

Control

Interface

Digital

VideoSignal

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P14

Support Output Analog InterfaceSupport Output Analog Interface

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Several HintSeveral Hint

On ADSP BF533 EZ-KIT, PPI is shared by

video decoder and video encoder.

If you use open source code from Internet,

even from website of Analog Device, be careof memory allocation and code optimization.

On EZ-KIT, you may simplify many part and

take more time on your critical softwaredesign such as video codec kernel, rather

than file format or some other things like that.