ENUM SDCA_CHANNEL_RELATIONSHIP(9)

🎀 NAME 🎀

enum sdca_channel_relationship — the SDCA Channel Relationship code, bestie. That's it, that's the name. It lives in the Kernel API Manual, section (9), so like... kernel-adjacent vibes, iykyk 💅

✨ SYNOPSIS ✨

enum sdca_channel_relationship {
    SDCA_CHAN_REL_UNDEFINED ,
    SDCA_CHAN_REL_GENERIC_MONO ,
    SDCA_CHAN_REL_GENERIC_LEFT ,
    SDCA_CHAN_REL_GENERIC_RIGHT ,
    SDCA_CHAN_REL_GENERIC_TOP ,
    SDCA_CHAN_REL_GENERIC_BOTTOM ,
    SDCA_CHAN_REL_CAPTURE_DIRECT ,
    SDCA_CHAN_REL_RENDER_DIRECT ,
    SDCA_CHAN_REL_FRONT_LEFT ,
    SDCA_CHAN_REL_FRONT_RIGHT ,
    SDCA_CHAN_REL_FRONT_CENTER ,
    SDCA_CHAN_REL_SIDE_LEFT ,
    SDCA_CHAN_REL_SIDE_RIGHT ,
    SDCA_CHAN_REL_BACK_LEFT ,
    SDCA_CHAN_REL_BACK_RIGHT ,
    SDCA_CHAN_REL_LOW_FREQUENCY_EFFECTS ,
    SDCA_CHAN_REL_SOUNDWIRE_MIC ,
    SDCA_CHAN_REL_SENSE_TRANSDUCER_1 ,
    SDCA_CHAN_REL_SENSE_TRANSDUCER_2 ,
    SDCA_CHAN_REL_SENSE_TRANSDUCER_12 ,
    SDCA_CHAN_REL_SENSE_TRANSDUCER_21 ,
    SDCA_CHAN_REL_ECHOREF_NONE ,
    SDCA_CHAN_REL_ECHOREF_1 ,
    SDCA_CHAN_REL_ECHOREF_2 ,
    SDCA_CHAN_REL_ECHOREF_3 ,
    SDCA_CHAN_REL_ECHOREF_4 ,
    SDCA_CHAN_REL_ECHOREF_ALL ,
    SDCA_CHAN_REL_ECHOREF_LFE_ALL ,
    SDCA_CHAN_REL_PRIMARY_TRANSDUCER ,
    SDCA_CHAN_REL_SECONDARY_TRANSDUCER ,
    SDCA_CHAN_REL_TERTIARY_TRANSDUCER ,
    SDCA_CHAN_REL_LOWER_LEFT_ALLTRANSDUCER ,
    SDCA_CHAN_REL_LOWER_RIGHT_ALLTRANSDUCER ,
    SDCA_CHAN_REL_UPPER_LEFT_ALLTRANSDUCER ,
    SDCA_CHAN_REL_UPPER_RIGHT_ALLTRANSDUCER ,
    SDCA_CHAN_REL_LOWER_LEFT_PRIMARY ,
    SDCA_CHAN_REL_LOWER_RIGHT_PRIMARY ,
    SDCA_CHAN_REL_UPPER_LEFT_PRIMARY ,
    SDCA_CHAN_REL_UPPER_RIGHT_PRIMARY ,
    SDCA_CHAN_REL_LOWER_LEFT_SECONDARY ,
    SDCA_CHAN_REL_LOWER_RIGHT_SECONDARY ,
    SDCA_CHAN_REL_UPPER_LEFT_SECONDARY ,
    SDCA_CHAN_REL_UPPER_RIGHT_SECONDARY ,
    SDCA_CHAN_REL_LOWER_LEFT_TERTIARY ,
    SDCA_CHAN_REL_LOWER_RIGHT_TERTIARY ,
    SDCA_CHAN_REL_UPPER_LEFT_TERTIARY ,
    SDCA_CHAN_REL_UPPER_RIGHT_TERTIARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_LEFT_PRIMARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_PRIMARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_LEFT_PRIMARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_PRIMARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_LEFT_SECONDARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_SECONDARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_LEFT_SECONDARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_SECONDARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_LEFT_TERTIARY ,
    SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_TERTIARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_LEFT_TERTIARY ,
    SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_TERTIARY ,
    SDCA_CHAN_REL_DERIVED_MONO_PRIMARY ,
    SDCA_CHAN_REL_DERIVED_MONO_SECONDARY ,
    SDCA_CHAN_REL_DERIVED_MONO_TERTIARY ,
    SDCA_CHAN_REL_EQUIPMENT_LEFT ,
    SDCA_CHAN_REL_EQUIPMENT_RIGHT ,
    SDCA_CHAN_REL_EQUIPMENT_COMBINED ,
    SDCA_CHAN_REL_EQUIPMENT_TOP ,
    SDCA_CHAN_REL_EQUIPMENT_BOTTOM ,
    SDCA_CHAN_REL_EQUIPMENT_TOP_LEFT ,
    SDCA_CHAN_REL_EQUIPMENT_BOTTOM_LEFT ,
    SDCA_CHAN_REL_EQUIPMENT_TOP_RIGHT ,
    SDCA_CHAN_REL_EQUIPMENT_BOTTOM_RIGHT ,
    SDCA_CHAN_REL_EQUIPMENT_SILENCED_OUTPUT ,
    SDCA_CHAN_REL_ARRAY ,
    SDCA_CHAN_REL_MIC ,
    SDCA_CHAN_REL_RAW ,
    SDCA_CHAN_REL_SILENCED_MIC ,
    SDCA_CHAN_REL_MULTI_SOURCE_1 ,
    SDCA_CHAN_REL_MULTI_SOURCE_2 ,
    SDCA_CHAN_REL_MULTI_SOURCE_3 ,
    SDCA_CHAN_REL_MULTI_SOURCE_4

};

💅 Constants 💅

Okay so real talk: every single one of these is listed in the source as literally -- undescribed --. No blurb, no notes, nothing. The docs just did not show up for this one 😭 So below is the full roster, exactly as written, with the placeholder being the whole personality. No cap.

• SDCA_CHAN_REL_UNDEFINED — -- undescribed -- in the source, that's all we get 🙈
• SDCA_CHAN_REL_GENERIC_MONO — -- undescribed --, blank in the source.
• SDCA_CHAN_REL_GENERIC_LEFT — -- undescribed --, no notes provided.
• SDCA_CHAN_REL_GENERIC_RIGHT — -- undescribed -- and nothing else 💀
• SDCA_CHAN_REL_GENERIC_TOP — -- undescribed --, the placeholder is doing all the work here.
• SDCA_CHAN_REL_GENERIC_BOTTOM — -- undescribed --, nobody wrote the blurb.
• SDCA_CHAN_REL_CAPTURE_DIRECT — -- undescribed --, still just the placeholder ✨
• SDCA_CHAN_REL_RENDER_DIRECT — -- undescribed -- in the source, fr fr.
• SDCA_CHAN_REL_FRONT_LEFT — -- undescribed --, no description attached.
• SDCA_CHAN_REL_FRONT_RIGHT — -- undescribed --, left blank 🫶
• SDCA_CHAN_REL_FRONT_CENTER — -- undescribed --, that's genuinely it.
• SDCA_CHAN_REL_SIDE_LEFT — -- undescribed --, the docs said nothing 💜
• SDCA_CHAN_REL_SIDE_RIGHT — -- undescribed --, placeholder only.
• SDCA_CHAN_REL_BACK_LEFT — -- undescribed --, no writeup exists.
• SDCA_CHAN_REL_BACK_RIGHT — -- undescribed --, same story.
• SDCA_CHAN_REL_LOW_FREQUENCY_EFFECTS — -- undescribed --, oddly iconic, still blank 🎀
• SDCA_CHAN_REL_SOUNDWIRE_MIC — -- undescribed --, nothing documented.
• SDCA_CHAN_REL_SENSE_TRANSDUCER_1 — -- undescribed --, no commentary in the source.
• SDCA_CHAN_REL_SENSE_TRANSDUCER_2 — -- undescribed --, blank again.
• SDCA_CHAN_REL_SENSE_TRANSDUCER_12 — -- undescribed --, left as a placeholder 🌸
• SDCA_CHAN_REL_SENSE_TRANSDUCER_21 — -- undescribed --, not a single word more.
• SDCA_CHAN_REL_ECHOREF_NONE — -- undescribed --, the source left it empty.
• SDCA_CHAN_REL_ECHOREF_1 — -- undescribed --, no details given.
• SDCA_CHAN_REL_ECHOREF_2 — -- undescribed --, placeholder status: unchanged.
• SDCA_CHAN_REL_ECHOREF_3 — -- undescribed --, still nothing ✨
• SDCA_CHAN_REL_ECHOREF_4 — -- undescribed --, no blurb written.
• SDCA_CHAN_REL_ECHOREF_ALL — -- undescribed --, blank as ever.
• SDCA_CHAN_REL_ECHOREF_LFE_ALL — -- undescribed --, no description provided 😭
• SDCA_CHAN_REL_PRIMARY_TRANSDUCER — -- undescribed --, that's the whole entry.
• SDCA_CHAN_REL_SECONDARY_TRANSDUCER — -- undescribed --, untouched placeholder.
• SDCA_CHAN_REL_TERTIARY_TRANSDUCER — -- undescribed --, no writeup, no notes.
• SDCA_CHAN_REL_LOWER_LEFT_ALLTRANSDUCER — -- undescribed --, left blank by the docs 🦋
• SDCA_CHAN_REL_LOWER_RIGHT_ALLTRANSDUCER — -- undescribed --, nothing attached.
• SDCA_CHAN_REL_UPPER_LEFT_ALLTRANSDUCER — -- undescribed --, placeholder only.
• SDCA_CHAN_REL_UPPER_RIGHT_ALLTRANSDUCER — -- undescribed --, no elaboration 💅
• SDCA_CHAN_REL_LOWER_LEFT_PRIMARY — -- undescribed --, still waiting on a description.
• SDCA_CHAN_REL_LOWER_RIGHT_PRIMARY — -- undescribed --, blank in the source.
• SDCA_CHAN_REL_UPPER_LEFT_PRIMARY — -- undescribed --, that's all there is.
• SDCA_CHAN_REL_UPPER_RIGHT_PRIMARY — -- undescribed --, no explanation given.
• SDCA_CHAN_REL_LOWER_LEFT_SECONDARY — -- undescribed --, the placeholder persists 💀
• SDCA_CHAN_REL_LOWER_RIGHT_SECONDARY — -- undescribed --, nothing more.
• SDCA_CHAN_REL_UPPER_LEFT_SECONDARY — -- undescribed --, left undescribed.
• SDCA_CHAN_REL_UPPER_RIGHT_SECONDARY — -- undescribed --, no notes anywhere.
• SDCA_CHAN_REL_LOWER_LEFT_TERTIARY — -- undescribed --, empty blurb zone.
• SDCA_CHAN_REL_LOWER_RIGHT_TERTIARY — -- undescribed --, still just that 🍓
• SDCA_CHAN_REL_UPPER_LEFT_TERTIARY — -- undescribed --, no details, bestie.
• SDCA_CHAN_REL_UPPER_RIGHT_TERTIARY — -- undescribed --, placeholder city.
• SDCA_CHAN_REL_DERIVED_LOWER_LEFT_PRIMARY — -- undescribed --, blank and proud.
• SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_PRIMARY — -- undescribed --, no writeup at all.
• SDCA_CHAN_REL_DERIVED_UPPER_LEFT_PRIMARY — -- undescribed --, nothing documented 🌈
• SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_PRIMARY — -- undescribed --, same placeholder energy.
• SDCA_CHAN_REL_DERIVED_LOWER_LEFT_SECONDARY — -- undescribed --, docs left it empty.
• SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_SECONDARY — -- undescribed --, no explanation.
• SDCA_CHAN_REL_DERIVED_UPPER_LEFT_SECONDARY — -- undescribed --, one hundred percent blank.
• SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_SECONDARY — -- undescribed --, placeholder, periodt.
• SDCA_CHAN_REL_DERIVED_LOWER_LEFT_TERTIARY — -- undescribed --, no notes given.
• SDCA_CHAN_REL_DERIVED_LOWER_RIGHT_TERTIARY — -- undescribed --, still undescribed 🧚
• SDCA_CHAN_REL_DERIVED_UPPER_LEFT_TERTIARY — -- undescribed --, untouched in the source.
• SDCA_CHAN_REL_DERIVED_UPPER_RIGHT_TERTIARY — -- undescribed --, nothing to add.
• SDCA_CHAN_REL_DERIVED_MONO_PRIMARY — -- undescribed --, blank by design-ish.
• SDCA_CHAN_REL_DERIVED_MONO_SECONDARY — -- undescribed --, no blurb exists.
• SDCA_CHAN_REL_DERIVED_MONO_TERTIARY — -- undescribed --, that's the vibe 🌟
• SDCA_CHAN_REL_EQUIPMENT_LEFT — -- undescribed --, placeholder only, no cap.
• SDCA_CHAN_REL_EQUIPMENT_RIGHT — -- undescribed --, left hanging.
• SDCA_CHAN_REL_EQUIPMENT_COMBINED — -- undescribed --, no description in the source.
• SDCA_CHAN_REL_EQUIPMENT_TOP — -- undescribed --, blank, sorry bestie.
• SDCA_CHAN_REL_EQUIPMENT_BOTTOM — -- undescribed --, nothing written.
• SDCA_CHAN_REL_EQUIPMENT_TOP_LEFT — -- undescribed --, placeholder stays undefeated 🔥
• SDCA_CHAN_REL_EQUIPMENT_BOTTOM_LEFT — -- undescribed --, no notes.
• SDCA_CHAN_REL_EQUIPMENT_TOP_RIGHT — -- undescribed --, left undescribed, literally.
• SDCA_CHAN_REL_EQUIPMENT_BOTTOM_RIGHT — -- undescribed --, that's it, that's the entry.
• SDCA_CHAN_REL_EQUIPMENT_SILENCED_OUTPUT — -- undescribed --, no explanation provided 🤐
• SDCA_CHAN_REL_ARRAY — -- undescribed --, blank in the source.
• SDCA_CHAN_REL_MIC — -- undescribed --, no blurb attached.
• SDCA_CHAN_REL_RAW — -- undescribed --, placeholder and nothing else.
• SDCA_CHAN_REL_SILENCED_MIC — -- undescribed --, still empty 💜
• SDCA_CHAN_REL_MULTI_SOURCE_1 — -- undescribed --, docs left it blank.
• SDCA_CHAN_REL_MULTI_SOURCE_2 — -- undescribed --, no description here either.
• SDCA_CHAN_REL_MULTI_SOURCE_3 — -- undescribed --, untouched placeholder.
• SDCA_CHAN_REL_MULTI_SOURCE_4 — -- undescribed --, last one in the list and still blank 🎀

🌈 DESCRIPTION 🌈

So what is this whole thing? Channel Relationship codes, as described in the SDCA specification v1.0, section 11.4.2. That's the actual answer — the manpage hands you the spec and points at the section, and honestly? Valid. 👑

Like, that's the entire description in the source, bestie. The constants above are all placeholders saying -- undescribed --, and the real semantics live in the spec, section 11.4.2. Not me gatekeeping — that's literally what's written. 🦋

• enum sdca_function_type(9) — the function-type enum, your little starter pack for this whole corner of the header 💖
• struct sdca_init_write(9) — a struct, and honestly the name is giving "setup era" ✨
• SDCA_CTL_TYPE(9) — all caps, zero lowercase, fully iconic 😌
• SDCA_CTL_TYPE_S(9) — the other one, with the _S on the end, and no we're not getting them confused (we are a little) 🫶
• enum sdca_messageoffset_range(9) — a range enum, very "the limits are the moment" of it
• enum sdca_ump_mode(9) — mode enum, slay
• enum sdca_ump_owner(9) — owner enum, also slay
• enum sdca_it_controls(9) — input-terminal controls, noted 📝
• enum sdca_ot_controls(9) — output-terminal controls, equally noted 📝
• enum sdca_usage_range(9) — a range, bestie, a range 🌈
• enum sdca_dataport_selector_range(9) — long name, big energy, still just a range 💅
• enum sdca_mu_controls(9) — mu controls, go off
• enum sdca_su_controls(9) — su controls, go off again
• enum sdca_fu_controls(9) — fu controls, the trilogy continues 🔥
• enum sdca_volume_range(9) — volume range, turn it up
• enum sdca_xu_controls(9) — xu controls, iconic
• enum sdca_fdl_set_index_range(9) — an index range for fdl sets, say that five times fast 😭
• enum sdca_cs_controls(9) — cs controls, present and accounted for
• enum sdca_samplerateindex_range(9) — samplerate index range, no cap
• enum sdca_cx_controls(9) — cx controls, we love a two-letter abbreviation
• enum sdca_pde_controls(9) — pde controls, hi bestie
• enum sdca_requested_ps_range(9) — requested ps range, the requested one specifically 👑
• enum sdca_ge_controls(9) — ge controls, here for it
• enum sdca_selected_mode_range(9) — selected mode range, very main character
• enum sdca_detected_mode_values(9) — detected mode values, note the plural, it matters 💀
• enum sdca_spe_controls(9) — spe controls, gorgeous
• enum sdca_cru_controls(9) — cru controls, also gorgeous
• enum sdca_udmpu_controls(9) — udmpu controls, that's a lot of consonants and yet ✨
• enum sdca_mfpu_controls(9) — mfpu controls, repping the pu family
• enum sdca_smpu_controls(9) — smpu controls, same family, different vibe
• enum sdca_sapu_controls(9) — sapu controls, the pu squad grows
• enum sdca_ppu_controls(9) — ppu controls, completing the lineup 🎀
• enum sdca_tg_controls(9) — tg controls, short and sweet
• enum sdca_hide_controls(9) — hide controls, lowkey mysterious 🙈
• enum sdca_entity0_controls(9) — entity zero controls, the most main character of entities ⭐
• enum sdca_control_datatype(9) — control datatype, foundational honestly
• enum sdca_access_mode(9) — access mode, we stan permissions
• enum sdca_access_layer(9) — access layer, the layer under the layer 🦋
• struct sdca_control_range(9) — control range struct, big "the limits" energy
• struct sdca_control(9) — the control struct itself, the blueprint, the moment 💅
• enum sdca_terminal_type(9) — terminal type enum, terminal rights
• enum sdca_connector_type(9) — connector type enum, connector rights too 🌸
• struct sdca_entity_iot(9) — the iot entity struct, here for the lore
• enum sdca_clock_type(9) — clock type enum, tick tock bestie ⏰
• struct sdca_entity_cs(9) — the cs entity struct, part of the family portrait
• enum sdca_pde_power_state(9) — power state enum, powerful literally 🔥
• struct sdca_pde_delay(9) — delay struct, it'll get there when it gets there 😭
• struct sdca_entity_pde(9) — pde entity struct, assembled from the two above
• enum sdca_entity_type(9) — entity type enum, the classifier of classifiers 👑
• struct sdca_ge_control(9) — ge control struct, control but make it a struct
• struct sdca_ge_mode(9) — ge mode struct, mode but make it a struct
• struct sdca_entity_ge(9) — ge entity struct, rounding out the ge trio 🎀
• struct sdca_entity_hide(9) — hide entity struct, hiding in plain sight 🙈
• enum sdca_xu_reset_mechanism(9) — reset mechanism enum, reset era 💅
• struct sdca_entity_xu(9) — xu entity struct, big struct energy
• struct sdca_entity(9) — the entity struct, the parent of the whole party 👑
• enum sdca_channel_purpose(9) — channel purpose enum, purpose found ✨
• struct sdca_channel(9) — channel struct, the whole point of the channel arc
• struct sdca_cluster(9) — cluster struct, they travel in packs
• enum sdca_cluster_range(9) — cluster range enum, packs but with limits
• struct sdca_fdl_file(9) — fdl file struct, a whole file in a struct, obsessed
• struct sdca_fdl_set(9) — fdl set struct, sets are slaying
• struct sdca_fdl_data(9) — fdl data struct, the payload of the fdl cinematic universe 🍓
• struct sdca_function_hid(9) — function hid struct, hid is literally right there in the name
• struct sdca_function_data(9) — function data struct, and that's the whole function arc wrapped, periodt 🫶

That's the whole reading list, bestie — go click through them whenever, the header will not judge you 💜

Okay so that's a wrap on this one! It came out of the kernel docs, living in ./include/sound, dated October 2026, and it's titled enum sdca_ch...relationship(9) — the truncated-looking name is real, that's genuinely how it's printed, don't come for me 😭 Go be iconic with your enums, mwah 💋🎀