617 строки
16 KiB
ReStructuredText
617 строки
16 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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==============================
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Using the Digital TV Framework
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==============================
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Introduction
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~~~~~~~~~~~~
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One significant difference between Digital TV and Analogue TV that the
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unwary (like myself) should consider is that, although the component
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structure of DVB-T cards are substantially similar to Analogue TV cards,
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they function in substantially different ways.
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The purpose of an Analogue TV is to receive and display an Analogue
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Television signal. An Analogue TV signal (otherwise known as composite
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video) is an analogue encoding of a sequence of image frames (25 frames
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per second in Europe) rasterised using an interlacing technique.
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Interlacing takes two fields to represent one frame. Therefore, an
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Analogue TV card for a PC has the following purpose:
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* Tune the receiver to receive a broadcast signal
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* demodulate the broadcast signal
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* demultiplex the analogue video signal and analogue audio
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signal.
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.. note::
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some countries employ a digital audio signal
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embedded within the modulated composite analogue signal -
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using NICAM signaling.)
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* digitize the analogue video signal and make the resulting datastream
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available to the data bus.
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The digital datastream from an Analogue TV card is generated by
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circuitry on the card and is often presented uncompressed. For a PAL TV
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signal encoded at a resolution of 768x576 24-bit color pixels over 25
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frames per second - a fair amount of data is generated and must be
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processed by the PC before it can be displayed on the video monitor
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screen. Some Analogue TV cards for PCs have onboard MPEG2 encoders which
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permit the raw digital data stream to be presented to the PC in an
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encoded and compressed form - similar to the form that is used in
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Digital TV.
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The purpose of a simple budget digital TV card (DVB-T,C or S) is to
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simply:
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* Tune the received to receive a broadcast signal. * Extract the encoded
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digital datastream from the broadcast signal.
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* Make the encoded digital datastream (MPEG2) available to the data bus.
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The significant difference between the two is that the tuner on the
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analogue TV card spits out an Analogue signal, whereas the tuner on the
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digital TV card spits out a compressed encoded digital datastream. As
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the signal is already digitised, it is trivial to pass this datastream
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to the PC databus with minimal additional processing and then extract
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the digital video and audio datastreams passing them to the appropriate
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software or hardware for decoding and viewing.
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Getting the card going
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~~~~~~~~~~~~~~~~~~~~~~
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The Device Driver API for DVB under Linux will the following
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device nodes via the devfs filesystem:
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* /dev/dvb/adapter0/demux0
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* /dev/dvb/adapter0/dvr0
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* /dev/dvb/adapter0/frontend0
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The ``/dev/dvb/adapter0/dvr0`` device node is used to read the MPEG2
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Data Stream and the ``/dev/dvb/adapter0/frontend0`` device node is used
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to tune the frontend tuner module. The ``/dev/dvb/adapter0/demux0`` is
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used to control what programs will be received.
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Depending on the card's feature set, the Device Driver API could also
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expose other device nodes:
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* /dev/dvb/adapter0/ca0
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* /dev/dvb/adapter0/audio0
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* /dev/dvb/adapter0/net0
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* /dev/dvb/adapter0/osd0
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* /dev/dvb/adapter0/video0
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The ``/dev/dvb/adapter0/ca0`` is used to decode encrypted channels. The
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other device nodes are found only on devices that use the av7110
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driver, with is now obsoleted, together with the extra API whose such
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devices use.
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Receiving a digital TV channel
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This section attempts to explain how it works and how this affects the
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configuration of a Digital TV card.
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On this example, we're considering tuning into DVB-T channels in
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Australia, at the Melbourne region.
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The frequencies broadcast by Mount Dandenong transmitters are,
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currently:
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Table 1. Transponder Frequencies Mount Dandenong, Vic, Aus.
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=========== ===========
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Broadcaster Frequency
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=========== ===========
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Seven 177.500 Mhz
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SBS 184.500 Mhz
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Nine 191.625 Mhz
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Ten 219.500 Mhz
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ABC 226.500 Mhz
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Channel 31 557.625 Mhz
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=========== ===========
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The digital TV Scan utilities (like dvbv5-scan) have use a set of
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compiled-in defaults for various countries and regions. Those are
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currently provided as a separate package, called dtv-scan-tables. It's
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git tree is located at LinuxTV.org:
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https://git.linuxtv.org/dtv-scan-tables.git/
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If none of the tables there suit, you can specify a data file on the
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command line which contains the transponder frequencies. Here is a
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sample file for the above channel transponders, in the old "channel"
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format::
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# Data file for DVB scan program
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#
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# C Frequency SymbolRate FEC QAM
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# S Frequency Polarisation SymbolRate FEC
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# T Frequency Bandwidth FEC FEC2 QAM Mode Guard Hier
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T 177500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE
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T 184500000 7MHz AUTO AUTO QAM64 8k 1/8 NONE
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T 191625000 7MHz AUTO AUTO QAM64 8k 1/16 NONE
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T 219500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE
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T 226500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE
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T 557625000 7MHz AUTO AUTO QPSK 8k 1/16 NONE
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Nowadays, we prefer to use a newer format, with is more verbose and easier
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to understand. With the new format, the "Seven" channel transponder's
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data is represented by::
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[Seven]
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = AUTO
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CODE_RATE_LP = AUTO
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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INVERSION = AUTO
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For an updated version of the complete table, please see:
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https://git.linuxtv.org/dtv-scan-tables.git/tree/dvb-t/au-Melbourne
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When the Digital TV scanning utility runs, it will output a file
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containing the information for all the audio and video programs that
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exists into each channel's transponders which the card's frontend can
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lock onto. (i.e. any whose signal is strong enough at your antenna).
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Here's the output of the dvbv5 tools from a channel scan took from
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Melburne::
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[ABC HDTV]
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SERVICE_ID = 560
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VIDEO_PID = 2307
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AUDIO_PID = 0
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[ABC TV Melbourne]
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SERVICE_ID = 561
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[ABC TV 2]
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SERVICE_ID = 562
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[ABC TV 3]
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SERVICE_ID = 563
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[ABC TV 4]
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SERVICE_ID = 564
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[ABC DiG Radio]
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SERVICE_ID = 566
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VIDEO_PID = 0
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AUDIO_PID = 2311
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 226500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 3/4
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital]
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SERVICE_ID = 1585
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital 1]
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SERVICE_ID = 1586
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital 2]
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SERVICE_ID = 1587
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital 3]
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SERVICE_ID = 1588
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital]
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SERVICE_ID = 1589
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital 4]
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SERVICE_ID = 1590
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital]
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SERVICE_ID = 1591
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN HD]
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SERVICE_ID = 1592
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VIDEO_PID = 514
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AUDIO_PID = 0
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[TEN Digital]
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SERVICE_ID = 1593
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VIDEO_PID = 512
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AUDIO_PID = 650
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 219500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[Nine Digital]
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SERVICE_ID = 1072
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VIDEO_PID = 513
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AUDIO_PID = 660
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 191625000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[Nine Digital HD]
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SERVICE_ID = 1073
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VIDEO_PID = 512
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AUDIO_PID = 0
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 191625000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[Nine Guide]
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SERVICE_ID = 1074
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VIDEO_PID = 514
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AUDIO_PID = 670
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 191625000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 3/4
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CODE_RATE_LP = 1/2
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/16
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HIERARCHY = NONE
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[7 Digital]
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SERVICE_ID = 1328
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VIDEO_PID = 769
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AUDIO_PID = 770
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[7 Digital 1]
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SERVICE_ID = 1329
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VIDEO_PID = 769
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AUDIO_PID = 770
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[7 Digital 2]
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SERVICE_ID = 1330
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VIDEO_PID = 769
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AUDIO_PID = 770
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[7 Digital 3]
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SERVICE_ID = 1331
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VIDEO_PID = 769
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AUDIO_PID = 770
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[7 HD Digital]
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SERVICE_ID = 1332
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VIDEO_PID = 833
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AUDIO_PID = 834
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[7 Program Guide]
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SERVICE_ID = 1334
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VIDEO_PID = 865
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AUDIO_PID = 866
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DELIVERY_SYSTEM = DVBT
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FREQUENCY = 177500000
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INVERSION = OFF
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BANDWIDTH_HZ = 7000000
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CODE_RATE_HP = 2/3
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CODE_RATE_LP = 2/3
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MODULATION = QAM/64
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TRANSMISSION_MODE = 8K
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GUARD_INTERVAL = 1/8
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HIERARCHY = NONE
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[SBS HD]
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SERVICE_ID = 784
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VIDEO_PID = 102
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AUDIO_PID = 103
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|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|
|
|
|
[SBS DIGITAL 1]
|
|
SERVICE_ID = 785
|
|
VIDEO_PID = 161
|
|
AUDIO_PID = 81
|
|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|
|
|
|
[SBS DIGITAL 2]
|
|
SERVICE_ID = 786
|
|
VIDEO_PID = 162
|
|
AUDIO_PID = 83
|
|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|
|
|
|
[SBS EPG]
|
|
SERVICE_ID = 787
|
|
VIDEO_PID = 163
|
|
AUDIO_PID = 85
|
|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|
|
|
|
[SBS RADIO 1]
|
|
SERVICE_ID = 798
|
|
VIDEO_PID = 0
|
|
AUDIO_PID = 201
|
|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|
|
|
|
[SBS RADIO 2]
|
|
SERVICE_ID = 799
|
|
VIDEO_PID = 0
|
|
AUDIO_PID = 202
|
|
DELIVERY_SYSTEM = DVBT
|
|
FREQUENCY = 536500000
|
|
INVERSION = OFF
|
|
BANDWIDTH_HZ = 7000000
|
|
CODE_RATE_HP = 2/3
|
|
CODE_RATE_LP = 2/3
|
|
MODULATION = QAM/64
|
|
TRANSMISSION_MODE = 8K
|
|
GUARD_INTERVAL = 1/8
|
|
HIERARCHY = NONE
|