STRUCT DTV_FRONTEND_PROPERTIES(9)

💖 struct dtv_frontend_properties(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this one's all about struct dtv_frontend_properties, and honestly? it's kind of a big deal. 🎀

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🌸 NAME 🌸

struct dtv_frontend_properties — the icon herself 👑, a struct that contains a list of properties that are specific to a digital TV standard. like, every vibe a DTV signal could possibly have, all in one place. periodt. 💅

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✨ SYNOPSIS ✨

struct dtv_frontend_properties {
    u32 frequency;
    enum fe_modulation      modulation;
    enum fe_sec_voltage     voltage;
    enum fe_sec_tone_mode   sectone;
    enum fe_spectral_inversion inversion;
    enum fe_code_rate       fec_inner;
    enum fe_transmit_mode   transmission_mode;
    u32 bandwidth_hz;
    enum fe_guard_interval  guard_interval;
    enum fe_hierarchy       hierarchy;
    u32 symbol_rate;
    enum fe_code_rate       code_rate_HP;
    enum fe_code_rate       code_rate_LP;
    enum fe_pilot           pilot;
    enum fe_rolloff         rolloff;
    enum fe_delivery_system delivery_system;
    enum fe_interleaving    interleaving;
    u8 isdbt_partial_reception;
    u8 isdbt_sb_mode;
    u8 isdbt_sb_subchannel;
    u32 isdbt_sb_segment_idx;
    u32 isdbt_sb_segment_count;
    u8 isdbt_layer_enabled;
    struct {
      u8 segment_count;
      enum fe_code_rate   fec;
      enum fe_modulation  modulation;
      u8 interleaving;
    } layer[3];
    u32 stream_id;
    u32 scrambling_sequence_index;
    u8 atscmh_fic_ver;
    u8 atscmh_parade_id;
    u8 atscmh_nog;
    u8 atscmh_tnog;
    u8 atscmh_sgn;
    u8 atscmh_prc;
    u8 atscmh_rs_frame_mode;
    u8 atscmh_rs_frame_ensemble;
    u8 atscmh_rs_code_mode_pri;
    u8 atscmh_rs_code_mode_sec;
    u8 atscmh_sccc_block_mode;
    u8 atscmh_sccc_code_mode_a;
    u8 atscmh_sccc_code_mode_b;
    u8 atscmh_sccc_code_mode_c;
    u8 atscmh_sccc_code_mode_d;
    u32 lna;
    struct dtv_fe_stats     strength;
    struct dtv_fe_stats     cnr;
    struct dtv_fe_stats     pre_bit_error;
    struct dtv_fe_stats     pre_bit_count;
    struct dtv_fe_stats     post_bit_error;
    struct dtv_fe_stats     post_bit_count;
    struct dtv_fe_stats     block_error;
    struct dtv_fe_stats     block_count;
 };

like… look at all those fields. she's thriving. 🦋

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🎀 MEMBERS 🎀

okay, going through every single one of these, no skips, no cap 🫶

• frequency — frequency in Hz for terrestrial/cable or in kHz for Satellite. yes, the units CHANGE depending on what you're tuning, so pay attention bestie 😭
• modulation — Frontend modulation type ✨
• voltage — SEC voltage (only Satellite)
• sectone — SEC tone mode (only Satellite)
• inversion — Spectral inversion
• fec_inner — Forward error correction inner Code Rate
• transmission_mode — Transmission Mode
• bandwidth_hz — Bandwidth, in Hz. A zero value means that userspace wants to autodetect. 👀
• guard_interval — Guard Interval
• hierarchy — Hierarchy
• symbol_rate — Symbol Rate
• code_rate_HP — high priority stream code rate
• code_rate_LP — low priority stream code rate
• pilot — Enable/disable/autodetect pilot tones
• rolloff — Rolloff factor (alpha)
• delivery_system — FE delivery system (e. g. digital TV standard). this is the main character of the whole struct ngl 🌟
• interleaving — interleaving
• isdbt_partial_reception — ISDB-T partial reception (only ISDB standard)
• isdbt_sb_mode — ISDB-T Sound Broadcast (SB) mode (only ISDB standard)
• isdbt_sb_subchannel — ISDB-T SB subchannel (only ISDB standard)
• isdbt_sb_segment_idx — ISDB-T SB segment index (only ISDB standard)
• isdbt_sb_segment_count — ISDB-T SB segment count (only ISDB standard)
• isdbt_layer_enabled — ISDB Layer enabled (only ISDB standard)
• layer — ISDB per-layer data (only ISDB standard)
  • layer.segment_count — Segment Count;
  • layer.fec — per layer code rate;
  • layer.modulation — per layer modulation;
  • layer.interleaving — per layer interleaving.
• stream_id — If different than zero, enable substream filtering, if hardware supports (DVB-S2 and DVB-T2). note the "if hardware supports" — that's not a guarantee, bestie 🙈
• scrambling_sequence_index — Carries the index of the DVB-S2 physical layer scrambling sequence.
• atscmh_fic_ver — Version number of the FIC (Fast Information Channel) signaling data (only ATSC-M/H)
• atscmh_parade_id — Parade identification number (only ATSC-M/H)
• atscmh_nog — Number of MH groups per MH subframe for a designated parade (only ATSC-M/H)
• atscmh_tnog — Total number of MH groups including all MH groups belonging to all MH parades in one MH subframe (only ATSC-M/H)
• atscmh_sgn — Start group number (only ATSC-M/H)
• atscmh_prc — Parade repetition cycle (only ATSC-M/H)
• atscmh_rs_frame_mode — Reed Solomon (RS) frame mode (only ATSC-M/H)
• atscmh_rs_frame_ensemble — RS frame ensemble (only ATSC-M/H)
• atscmh_rs_code_mode_pri — RS code mode pri (only ATSC-M/H)
• atscmh_rs_code_mode_sec — RS code mode sec (only ATSC-M/H)
• atscmh_sccc_block_mode — Series Concatenated Convolutional Code (SCCC) Block Mode (only ATSC-M/H)
• atscmh_sccc_code_mode_a — SCCC code mode A (only ATSC-M/H)
• atscmh_sccc_code_mode_b — SCCC code mode B (only ATSC-M/H)
• atscmh_sccc_code_mode_c — SCCC code mode C (only ATSC-M/H)
• atscmh_sccc_code_mode_d — SCCC code mode D (only ATSC-M/H)
• lna — Power ON/OFF/AUTO the Linear Now-noise Amplifier (LNA). yes it literally says "Now-noise" in the source, we're keeping it verbatim, no editing, we don't touch the sacred text 💀
• strength — DVBv5 API statistics: Signal Strength
• cnr — DVBv5 API statistics: Signal to Noise ratio of the (main) carrier
• pre_bit_error — DVBv5 API statistics: pre-Viterbi bit error count
• pre_bit_count — DVBv5 API statistics: pre-Viterbi bit count
• post_bit_error — DVBv5 API statistics: post-Viterbi bit error count
• post_bit_count — DVBv5 API statistics: post-Viterbi bit count
• block_error — DVBv5 API statistics: block error count
• block_count — DVBv5 API statistics: block count

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💀 NOTE 💀

• derivated statistics like Uncorrected Error blocks (UCE) are calculated on userspace. so like, that math is your problem, not the kernel's, bestie 🧚
• Only a subset of the properties are needed for a given delivery system. so don't come for the whole struct when you only need like three fields 💅 For more info, consult the media_api.html with the documentation of the Userspace API.

fr fr — read the Userspace API docs before you go poking at fields that don't apply to your delivery system. it's giving "respect the subset" energy 🌈

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🔥 SEE ALSO 🔥

• Kernel file ./include/media/dvb_frontend.h struct
• dvb_frontend_tune_settings(9)
• struct dvb_tuner_info(9)
• struct analog_parameters(9)
• enum dvbfe_algo(9)
• enum dvbfe_search(9)
• struct dvb_tuner_ops(9)
• struct analog_demod_info(9)
• struct analog_demod_ops(9)
• struct dvb_frontend_internal_info(9)
• struct dvb_frontend_ops(9)
• struct dvb_frontend(9)
• dvb_register_frontend(9)
• dvb_unregister_frontend(9)
• dvb_frontend_detach(9)
• dvb_frontend_suspend(9)
• dvb_frontend_resume(9)
• dvb_frontend_reinitialise(9)
• dvb_frontend_sleep_until(9)

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aaaand that's the whole thing!! 🎉 this page lives in ./include/media, version dated October 2026, and it's titled struct dtv_f...d_properties(9) — yes the title is abbreviated with ... in the header and footer, that's just how it do 💖 go off, king, tune that frontend, slay ✨🫶🍓