DTV Infrastructure from Standards to Startups

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DTV Infrastructurefrom Standards to Startups

• Milton Chen

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Overview

• Ground rules
• Your DTV station
• Your DTV receiver

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MPEG-2 Transport Stream

• 188 byte packets
• 4 bytes header
• sync_byte (0x47)
• packet ID (13 bits)
• 0x11, 21, or 31 are video by convention
• 0x14, 24, or 34 are the corresponding audio
• transport_error_indicator (1 bit)
• transport_scrambling_control (2 bits)
• priority (1 bit)

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ATSC 8-VSB Data Rate

• data rate 2 W log ( L ) 32.286 Mbps
• W 5.381MHz (not 6 because of bandpass filter)
• L 8 levels
• 32.286 Mbps 2/3 188/(18820) 312/313 19.4
  Mbps (often quoted rate), 2/3 from Trellis
  Encoding, 20 from parity bytes
• 19.4 Mbps 184 / 188 19.0 Mbps (maximum data
  rate)
• 19.0 Mbps (65536 20 8)/65536 19.0 Mbps
  (maximum UDP/IP data rate), 20 byte IP header, 8
  byte UDP header

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Your DTV Station
8
18W
720/60P HD Camera 300k
D5 Tape Deck 288 Mbps 150k
a site
KMRL 28
4 k
UP Converter 1k
8-VSB Modulator 50k
DTV File Server
Teirnan THE-1HDTV Encoder 200k
DVB-ASI
HD Storage 150k
Dolby PD-567 AC-3 Encoder 3k
Audio PES
Fiber link
Audio
Philips Token MUX 25k
Tiernan Universal Interface 5k
DVB-ASI
ASI
SkyStream DBN-26 50k
Philips VE98 SDTV Encoder 40k
Video PES
SMPTE-310
SD camcorder
A/D
IP Data
PSI/PSIP Tables
DVB-ASI
Microwave link
70 k
250KW
IA servers
Data Input
DVB-SPI
IA File Server
KICU 52 DTV Station
b site
Internet
T1
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KICUSignal Contour
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Your DTV Receiver
Intel Video API
Intel ATVEF API
Intel Transport API
IP Multicast API
Intel DTV Driver (K2)
Hauppauge/Philips receiver board (Coney/Maui)
Linux and Windows
Windows
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DTV Receiver Board Diagram
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Intel Transport API

• Channel Tuning
• DTVInitFromATSC (channel)
• DTVInitFromFile (file,bitrate,loop )
• class DTVConn DTVConn ( pid, raw ) int
  RetrieveBuffer ( buf, wait ) int ReturnBuffer
  (buf ) int Flush()
• Utility Tools
• VSBM, DTVStat, iDTVtest, DTVRec, Dmon, DTVSim

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Intel Video API

• MPEG Processing Library (MPL)
• Access to decoded video frames and much more
• Highly optimized codec
• path to OpenGL video texture
• DirectShow wrappers

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IP Multicast API

• Standard Winsock programming
• Run DTVSock.exe to enable data flow
• Likely to be supported by all PC DTV cards
• Hauppauge/Philips
• Creative Labs/Teralogic
• Broadlogic
• Realtime back channel to complete the loop

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Advanced Televison Enhancement Forum (ATVEF)

• Framework for interactive TV over ATSC, NTSC, and
  Internet
• Based on WEB standards
• HTML, JavaScript
• Use IP to transport all data
• Uni-direction HTTP
• All-or-none
• Error correction
• Object segmentation
• Naming scheme for cached data
• At least 1MB of data cache in receiver

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ATVEF (2)

• Announcements
• address 224.0.1.113 and port 2670
• describe the enhancement and what IP addresses to
  listen for triggers and resources
• Triggers
• 1 UDP packet
• Resources
• web pages, images, scripts, gzipped data

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Producing Your Content

• Capturing Video
• camera, camcorder
• Editing Video
• Adobe Premiere, Avid Express
• ATVEF
• WEB tools
• Intel Broadcast Plus Tools
• scripts
• MPEG2 Transport Stream
• Intels Dynamux.exe (software mux)
• Other ...

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What Next

• Programming session
• Next Monday night
• Tools and sample codes
• Most systems at three months before tradeshow
  stage
• Tell me what you need