162306a36Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci.. _dvb_frontend: 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci####################### 662306a36Sopenharmony_ciDigital TV Frontend API 762306a36Sopenharmony_ci####################### 862306a36Sopenharmony_ci 962306a36Sopenharmony_ciThe Digital TV frontend API was designed to support three groups of delivery 1062306a36Sopenharmony_cisystems: Terrestrial, cable and Satellite. Currently, the following 1162306a36Sopenharmony_cidelivery systems are supported: 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci- Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H, 1462306a36Sopenharmony_ci DTMB, CMMB 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci- Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B) 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ciThe Digital TV frontend controls several sub-devices including: 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci- Tuner 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ci- Digital TV demodulator 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci- Low noise amplifier (LNA) 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ci- Satellite Equipment Control (SEC) [#f1]_. 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_ciThe frontend can be accessed through ``/dev/dvb/adapter?/frontend?``. 3162306a36Sopenharmony_ciData types and ioctl definitions can be accessed by including 3262306a36Sopenharmony_ci``linux/dvb/frontend.h`` in your application. 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci.. note:: 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport) 3762306a36Sopenharmony_ci is not yet handled by this API but a future extension is possible. 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_ci.. [#f1] 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci On Satellite systems, the API support for the Satellite Equipment 4262306a36Sopenharmony_ci Control (SEC) allows to power control and to send/receive signals to 4362306a36Sopenharmony_ci control the antenna subsystem, selecting the polarization and choosing 4462306a36Sopenharmony_ci the Intermediate Frequency IF) of the Low Noise Block Converter Feed 4562306a36Sopenharmony_ci Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC 4662306a36Sopenharmony_ci (digital SEC) specification is available at 4762306a36Sopenharmony_ci `Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__. 4862306a36Sopenharmony_ci 4962306a36Sopenharmony_ci 5062306a36Sopenharmony_ci.. toctree:: 5162306a36Sopenharmony_ci :maxdepth: 1 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_ci query-dvb-frontend-info 5462306a36Sopenharmony_ci dvb-fe-read-status 5562306a36Sopenharmony_ci dvbproperty 5662306a36Sopenharmony_ci frontend_fcalls 57