1*059b1c5bSMauro Carvalho Chehab.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 254f38fcaSMauro Carvalho Chehab 354f38fcaSMauro Carvalho Chehab.. _dvb_frontend: 454f38fcaSMauro Carvalho Chehab 554f38fcaSMauro Carvalho Chehab####################### 654f38fcaSMauro Carvalho ChehabDigital TV Frontend API 754f38fcaSMauro Carvalho Chehab####################### 854f38fcaSMauro Carvalho Chehab 954f38fcaSMauro Carvalho ChehabThe Digital TV frontend API was designed to support three groups of delivery 1054f38fcaSMauro Carvalho Chehabsystems: Terrestrial, cable and Satellite. Currently, the following 1154f38fcaSMauro Carvalho Chehabdelivery systems are supported: 1254f38fcaSMauro Carvalho Chehab 1354f38fcaSMauro Carvalho Chehab- Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H, 1454f38fcaSMauro Carvalho Chehab DTMB, CMMB 1554f38fcaSMauro Carvalho Chehab 1654f38fcaSMauro Carvalho Chehab- Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B) 1754f38fcaSMauro Carvalho Chehab 1854f38fcaSMauro Carvalho Chehab- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS 1954f38fcaSMauro Carvalho Chehab 2054f38fcaSMauro Carvalho ChehabThe Digital TV frontend controls several sub-devices including: 2154f38fcaSMauro Carvalho Chehab 2254f38fcaSMauro Carvalho Chehab- Tuner 2354f38fcaSMauro Carvalho Chehab 2454f38fcaSMauro Carvalho Chehab- Digital TV demodulator 2554f38fcaSMauro Carvalho Chehab 2654f38fcaSMauro Carvalho Chehab- Low noise amplifier (LNA) 2754f38fcaSMauro Carvalho Chehab 2854f38fcaSMauro Carvalho Chehab- Satellite Equipment Control (SEC) [#f1]_. 2954f38fcaSMauro Carvalho Chehab 3054f38fcaSMauro Carvalho ChehabThe frontend can be accessed through ``/dev/dvb/adapter?/frontend?``. 3154f38fcaSMauro Carvalho ChehabData types and ioctl definitions can be accessed by including 3254f38fcaSMauro Carvalho Chehab``linux/dvb/frontend.h`` in your application. 3354f38fcaSMauro Carvalho Chehab 3454f38fcaSMauro Carvalho Chehab.. note:: 3554f38fcaSMauro Carvalho Chehab 3654f38fcaSMauro Carvalho Chehab Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport) 3754f38fcaSMauro Carvalho Chehab is not yet handled by this API but a future extension is possible. 3854f38fcaSMauro Carvalho Chehab 3954f38fcaSMauro Carvalho Chehab.. [#f1] 4054f38fcaSMauro Carvalho Chehab 4154f38fcaSMauro Carvalho Chehab On Satellite systems, the API support for the Satellite Equipment 4254f38fcaSMauro Carvalho Chehab Control (SEC) allows to power control and to send/receive signals to 4354f38fcaSMauro Carvalho Chehab control the antenna subsystem, selecting the polarization and choosing 4454f38fcaSMauro Carvalho Chehab the Intermediate Frequency IF) of the Low Noise Block Converter Feed 4554f38fcaSMauro Carvalho Chehab Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC 4654f38fcaSMauro Carvalho Chehab (digital SEC) specification is available at 4754f38fcaSMauro Carvalho Chehab `Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__. 4854f38fcaSMauro Carvalho Chehab 4954f38fcaSMauro Carvalho Chehab 5054f38fcaSMauro Carvalho Chehab.. toctree:: 5154f38fcaSMauro Carvalho Chehab :maxdepth: 1 5254f38fcaSMauro Carvalho Chehab 5354f38fcaSMauro Carvalho Chehab query-dvb-frontend-info 5454f38fcaSMauro Carvalho Chehab dvb-fe-read-status 5554f38fcaSMauro Carvalho Chehab dvbproperty 5654f38fcaSMauro Carvalho Chehab frontend_fcalls 57