1*4882a593Smuzhiyun.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun.. _dvb_frontend: 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun####################### 6*4882a593SmuzhiyunDigital TV Frontend API 7*4882a593Smuzhiyun####################### 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunThe Digital TV frontend API was designed to support three groups of delivery 10*4882a593Smuzhiyunsystems: Terrestrial, cable and Satellite. Currently, the following 11*4882a593Smuzhiyundelivery systems are supported: 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun- Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H, 14*4882a593Smuzhiyun DTMB, CMMB 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun- Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B) 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS 19*4882a593Smuzhiyun 20*4882a593SmuzhiyunThe Digital TV frontend controls several sub-devices including: 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun- Tuner 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun- Digital TV demodulator 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun- Low noise amplifier (LNA) 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun- Satellite Equipment Control (SEC) [#f1]_. 29*4882a593Smuzhiyun 30*4882a593SmuzhiyunThe frontend can be accessed through ``/dev/dvb/adapter?/frontend?``. 31*4882a593SmuzhiyunData types and ioctl definitions can be accessed by including 32*4882a593Smuzhiyun``linux/dvb/frontend.h`` in your application. 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun.. note:: 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport) 37*4882a593Smuzhiyun is not yet handled by this API but a future extension is possible. 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun.. [#f1] 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun On Satellite systems, the API support for the Satellite Equipment 42*4882a593Smuzhiyun Control (SEC) allows to power control and to send/receive signals to 43*4882a593Smuzhiyun control the antenna subsystem, selecting the polarization and choosing 44*4882a593Smuzhiyun the Intermediate Frequency IF) of the Low Noise Block Converter Feed 45*4882a593Smuzhiyun Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC 46*4882a593Smuzhiyun (digital SEC) specification is available at 47*4882a593Smuzhiyun `Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__. 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun.. toctree:: 51*4882a593Smuzhiyun :maxdepth: 1 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun query-dvb-frontend-info 54*4882a593Smuzhiyun dvb-fe-read-status 55*4882a593Smuzhiyun dvbproperty 56*4882a593Smuzhiyun frontend_fcalls 57