| .. Permission is granted to copy, distribute and/or modify this |
| .. document under the terms of the GNU Free Documentation License, |
| .. Version 1.1 or any later version published by the Free Software |
| .. Foundation, with no Invariant Sections, no Front-Cover Texts |
| .. and no Back-Cover Texts. A copy of the license is included at |
| .. Documentation/media/uapi/fdl-appendix.rst. |
| .. |
| .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections |
| |
| .. _dvb_frontend: |
| |
| ####################### |
| Digital TV Frontend API |
| ####################### |
| |
| The Digital TV frontend API was designed to support three groups of delivery |
| systems: Terrestrial, cable and Satellite. Currently, the following |
| delivery systems are supported: |
| |
| - Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H, |
| DTMB, CMMB |
| |
| - Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B) |
| |
| - Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS |
| |
| The Digital TV frontend controls several sub-devices including: |
| |
| - Tuner |
| |
| - Digital TV demodulator |
| |
| - Low noise amplifier (LNA) |
| |
| - Satellite Equipment Control (SEC) [#f1]_. |
| |
| The frontend can be accessed through ``/dev/dvb/adapter?/frontend?``. |
| Data types and ioctl definitions can be accessed by including |
| ``linux/dvb/frontend.h`` in your application. |
| |
| .. note:: |
| |
| Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport) |
| is not yet handled by this API but a future extension is possible. |
| |
| .. [#f1] |
| |
| On Satellite systems, the API support for the Satellite Equipment |
| Control (SEC) allows to power control and to send/receive signals to |
| control the antenna subsystem, selecting the polarization and choosing |
| the Intermediate Frequency IF) of the Low Noise Block Converter Feed |
| Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC |
| (digital SEC) specification is available at |
| `Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__. |
| |
| |
| .. toctree:: |
| :maxdepth: 1 |
| |
| query-dvb-frontend-info |
| dvb-fe-read-status |
| dvbproperty |
| frontend_fcalls |
