2. 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) [1].

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.

[1]

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.

• 2.1. Querying frontend information
• 2.2. Querying frontend status and statistics
• 2.3. Property types
• 2.4. Frontend Function Calls