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Mauro Carvalho Chehabf2ac8ce82018-08-30 10:20:04 -04001.. SPDX-License-Identifier: GPL-2.0
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Mauro Carvalho Chehab684ffa22016-07-17 08:22:23 -03003Digital TV (DVB) devices
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Mauro Carvalho Chehabf495ab82017-06-25 12:40:41 -03006Digital TV devices are implemented by several different drivers:
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8- A bridge driver that is responsible to talk with the bus where the other
9 devices are connected (PCI, USB, SPI), bind to the other drivers and
10 implement the digital demux logic (either in software or in hardware);
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12- Frontend drivers that are usually implemented as two separate drivers:
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Marc Gonzaleze96a8812019-06-05 07:59:10 -040014 - A tuner driver that implements the logic which commands the part of
15 the hardware responsible for tuning into a digital TV transponder or
Mauro Carvalho Chehabf495ab82017-06-25 12:40:41 -030016 physical channel. The output of a tuner is usually a baseband or
17 Intermediate Frequency (IF) signal;
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Marc Gonzaleze96a8812019-06-05 07:59:10 -040019 - A demodulator driver (a.k.a "demod") that implements the logic which
Mauro Carvalho Chehabf495ab82017-06-25 12:40:41 -030020 commands the digital TV decoding hardware. The output of a demod is
21 a digital stream, with multiple audio, video and data channels typically
22 multiplexed using MPEG Transport Stream [#f1]_.
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24On most hardware, the frontend drivers talk with the bridge driver using an
25I2C bus.
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27.. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an
28 abandoned standard, not used anymore) and ATSC version 3.0 current
29 proposals. Currently, the DVB subsystem doesn't implement those standards.
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Mauro Carvalho Chehab684ffa22016-07-17 08:22:23 -030031
Mauro Carvalho Chehab5b3b8c82017-09-19 16:54:15 -040032.. toctree::
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Mauro Carvalho Chehab7af90c02017-09-19 16:46:10 -040034
Mauro Carvalho Chehab5b3b8c82017-09-19 16:54:15 -040035 dtv-common
36 dtv-frontend
37 dtv-demux
38 dtv-ca
Mauro Carvalho Chehabb5b03a22017-09-20 13:51:06 -040039 dtv-net