tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1Digital TV (DVB) devices
2------------------------
3
4Digital TV devices are implemented by several different drivers:
5
6- A bridge driver that is responsible to talk with the bus where the other
7 devices are connected (PCI, USB, SPI), bind to the other drivers and
8 implement the digital demux logic (either in software or in hardware);
9
10- Frontend drivers that are usually implemented as two separate drivers:
11
12 - A tuner driver that implements the logic with commands the part of the
13 hardware with is reponsible to tune into a digital TV transponder or
14 physical channel. The output of a tuner is usually a baseband or
15 Intermediate Frequency (IF) signal;
16
17 - A demodulator driver (a.k.a "demod") that implements the logic with
18 commands the digital TV decoding hardware. The output of a demod is
19 a digital stream, with multiple audio, video and data channels typically
20 multiplexed using MPEG Transport Stream [#f1]_.
21
22On most hardware, the frontend drivers talk with the bridge driver using an
23I2C bus.
24
25.. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an
26 abandoned standard, not used anymore) and ATSC version 3.0 current
27 proposals. Currently, the DVB subsystem doesn't implement those standards.
28
29
30.. toctree::
31 :maxdepth: 1
32
33 dtv-common
34 dtv-frontend
35 dtv-demux
36 dtv-ca
37 dtv-net