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SPDX v3.10 gained support for GFDL-1.1 with no invariant sections: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html So, remove the license text, replacing them by this new SPDX license. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
56 lines
1.6 KiB
ReStructuredText
56 lines
1.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. _dvb_frontend:
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#######################
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Digital TV Frontend API
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#######################
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The Digital TV frontend API was designed to support three groups of delivery
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systems: Terrestrial, cable and Satellite. Currently, the following
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delivery systems are supported:
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- Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H,
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DTMB, CMMB
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- Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B)
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- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS
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The Digital TV frontend controls several sub-devices including:
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- Tuner
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- Digital TV demodulator
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- Low noise amplifier (LNA)
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- Satellite Equipment Control (SEC) [#f1]_.
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The frontend can be accessed through ``/dev/dvb/adapter?/frontend?``.
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Data types and ioctl definitions can be accessed by including
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``linux/dvb/frontend.h`` in your application.
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.. note::
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Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport)
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is not yet handled by this API but a future extension is possible.
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.. [#f1]
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On Satellite systems, the API support for the Satellite Equipment
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Control (SEC) allows to power control and to send/receive signals to
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control the antenna subsystem, selecting the polarization and choosing
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the Intermediate Frequency IF) of the Low Noise Block Converter Feed
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Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC
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(digital SEC) specification is available at
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`Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__.
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.. toctree::
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:maxdepth: 1
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query-dvb-frontend-info
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dvb-fe-read-status
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dvbproperty
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frontend_fcalls
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