ISWN (Integrated Services Wireless Network) Richard Akester UCL.

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Presentation transcript:

ISWN (Integrated Services Wireless Network) Richard Akester UCL

Introduction Test network –Software DVB-T –Stream Types –Multiplexes –Infrastructure/Ad-hoc –Unicast/Multicast Network Support Future Work

Test network DVB-T ADSL b

Software tzap ts2ps tuner kernelApp space demux TV SERVERCLIENT App spacekernel udprecv mplayer ALSA X11 Multicast Over

Elementary Stream (ES) Video (MPEG2): IBBPBBPBBPBBPI I: Intra frames, P: Predictive frames, B: Bi-directional frames GOP: 12, (~2 [PAL]), 4-6Mbps Audio (MP2): AAAAAAAA A: Audio frames (1152 audio samples ~42fps]) kbps

Packetized Elementary Stream (PES) 00 Header: 0001PT PT (Payload Type): 0xE0=1 st video stream, 0xC0=1 st audio stream Length: usually 2048 (2K) bytes (but can be less) LengthFlag1Flag2hlengthpts

Transport Stream (TS) Header: 0x47FlagsPIDFlags Adaptation Field Header+Body = 188 bytes PID (Program ID): allows programs to be multiplexed, but also distinguishes between substreams [eg BBC1 PIDs: 600 (video), 601 (audio), 603 (subtitles), 4167 (teletext)] Special PIDs: NIT (Network Information Table), SDT (Service Description Table), PMT (Program Map Tables), PAT (Program Association Table).

DVB-T Multiplexes 1 (18Mbps): BBC 1, BBC 2, BBC 3, BBC News 24, CBBC 2 (24Mbps): ITV 1, ITV 2, Channel 4, Teletext, ITV News, FourText, Ch 14 A (24Mbps): five, TV Travel Shop, QVC, bid-up.tv, ntl, Ch 15, BBC Radio 1, 2, 3, 4 B (18Mbps): BBC 4, CBeebies, BBC Parliament, 1Xtra, BBC R5 Live, BBC 5L SportsX, BBC 6 Music, BBC 7, BBC Asian Net, Community, 701, 702, 703 C (18Mbps): UK History, Sky News, Sky Travel, Sky Sports News, Magic, Hits Radio D (18Mbps): The HITS, TMF, f tn, UKBrightIdeas, CBM, Free2Play, Q, Magic, Hits Radio, BBC World Sv, oneword, jazz fm, Kerrang!, Smash Hits!, Kiss

ad-hoc network Consumer electronic devices may use this mode (no access point) No option to use PCF (have to use DCF) –Although IEEE802.11e… Distributed beaconing

Unicast sender receiver RTS (Request To Send) CTS (Clear To Send) DATA ACK

Multicast sender receiver DATA

RTP (Realtime Transport Protocol) RFC2250 (how to carry MPEG2 video and audio in RTP) –A) encapsulate PS/TS in RTP headers Often done (eg dvbstream) –B) encapsulate ES in RTP headers with extra header info added Not so common…

Streaming software Dvbstream –Designed for dvb-s (satellite) but could be rewritten for dvb-t –Sends TS/PS encapsulated in RTP ffmpeg/ffserver –ffmpeg can transcode MPEG2->MPEG4 –ffserver can serve resulting “file” over HTTP VideoLAN –Vlc: client/player that can also transcode/act as a server

Future Work Partial transcoding ( 8_PR/iab_talk_jw.pdf) Subtitles/EPG incorporating into OSD Channel zapper: web interface? PVR –Programmable by web interface –Time/Date/Channel OR just click on program name!