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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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DTV Software Infrastructure

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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 ?


Client Stack

DTV_MPEG API

DTV_Object API

DTV API

application

driver

emulation

demand

operation system

receiver card

disk

hardware


DTV API

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

  • int DTVClose();


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)

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


DTV_MPEG API

  • Set a dozen global variables

    • playbacklevel, texture size, etc.

  • MyDtvDecoder()

  • unsigned char RGBarray[]


DTV_Object API

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


DTV_Object API (2)

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


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

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

  • Object Parameter File

    #file obj. name insert time magicidobj1.exeobj10.01obj2.zipobj20.52obj3.htmlobj31.03

  • Run dynamux.exe


Headend - Arbitrary data

  • Write it to a file

  • Run dynamux.exe


Headend - Multiplexer

  • dynamux.exe

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


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

  • C:\Dtv_public

    • content

    • headend

    • receiver

      • bin

      • include

      • lib

      • sample


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