dtv software infrastructure
Download
Skip this Video
Download Presentation
DTV Software Infrastructure

Loading in 2 Seconds...

play fullscreen
1 / 17

DTV Software Infrastructure - PowerPoint PPT Presentation


  • 106 Views
  • Uploaded on

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 ?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'DTV Software Infrastructure' - nitza


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
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
ad