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DTV Software Infrastructure. Milton Chen. Outline. MPEG-2 Transport Stream Client Headend Examples. MPEG-2 Transport Stream. Packet 188 bytes (header plus payload) 13 bit packet ID (pid) 1 bit priority Filename ends in .ts (our convention) Which MPEG are you talking about ?.

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PowerPoint Slideshow about 'DTV Software Infrastructure' - nitza


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Presentation Transcript

Outline
Outline

  • MPEG-2 Transport Stream

  • Client

  • Headend

  • Examples


Mpeg 2 transport stream
MPEG-2 Transport Stream

  • Packet

    • 188 bytes (header plus payload)

    • 13 bit packet ID (pid)

    • 1 bit priority

  • Filename ends in .ts (our convention)

  • Which MPEG are you talking about ?


Client stack
Client Stack

DTV_MPEG API

DTV_Object API

DTV API

application

driver

emulation

demand

operation system

receiver card

disk

hardware


Dtv api
DTV API

  • int DTVInit( int channel, char *tsfname, bool loop, double bitrate );

  • int DTVClose();


Dtv api 2
DTV API (2)

  • class DTVConn { DTVConn( int pid, int raw ); int RetrieveBuffer( DTVappbuf ** buf, int wait ); int ReturnBuffer( DTVappbuf * buf ) int Flush();}


Dtv api 3
DTV API (3)

  • typedef struct { int filledsize; unsigned char * data;} DTVappbuf;


Dtv mpeg api
DTV_MPEG API

  • Set a dozen global variables

    • playbacklevel, texture size, etc.

  • MyDtvDecoder()

  • unsigned char RGBarray[]


Dtv object api
DTV_Object API

  • class DtvObjStream { DtvObjStream( int pid ); int GetObj( char * objname, int waittime, dtvobject * obj ); int CloseObj( dtvobject *obj );}


Dtv object api 2
DTV_Object API (2)

  • typedef struct { char name[256]; FILE * data;} dtvobject;


Client environment
Client Environment

1. Win 95

2. DirectX 5

3. ATI Rage Pro or Intel 740 Graphics Card

  • Live reception requires 1

  • MPEG decoder requires 2, 3

  • Link with multi-threaded library in VC++


Headend video
Headend - Video

1. Camera ->

2. Video Capture Card ->

3. capture.exe ( .ppm ) ->

4. MPEG2 Encoder ( .m2v ) ->

5. pespacketizer.exe ( .pes ) ->

6. dynamux.exe ( .ts )

  • Step 4, 5, and 6 are not real-time

  • tools to manipulate .m2v files (clip, cat, …)


Headend object
Headend - Object

  • Object Parameter File

    #file obj. name insert time magicidobj1.exe obj1 0.0 1obj2.zip obj2 0.5 2obj3.html obj3 1.0 3

  • Run dynamux.exe


Headend arbitrary data
Headend - Arbitrary data

  • Write it to a file

  • Run dynamux.exe


Headend multiplexer
Headend - Multiplexer

  • dynamux.exe

  • Convert video, audio, object, and arbitrary data from different sources into one transport stream


Examples
Examples

  • MyDtvReceiver (DTV API)

    • count the number of bytes received

  • MyDtvApp (DTV_MPEG API)

    • one thread decode to shared memory

    • one thread display the decoded frames with OpenGL texture mapping

  • MyDtvWeb (DTV_Object API)

    • receive one html file and launch netscape to display that file


Source tree
Source Tree

  • C:\Dtv_public

    • content

    • headend

    • receiver

      • bin

      • include

      • lib

      • sample


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