Module wrapper 

Helpers shared across format wrappers (CLAP, VST3, VST2, AU, AAX, LV2).

Each wrapper still owns its format-specific descriptor types and callback tables; those don’t unify cleanly. What unifies is the “boring” boundary glue: building CStrings from ParamInfo fields, picking the default bus layout, and resolving install-time name overrides.

Each helper is a single small function so the wrappers stay greppable - the per-format vtable construction code reads as “for each param, get cstrings, build descriptor” without inlined CString::new(...).unwrap_or_default() boilerplate.

Adding a new format wrapper? Reach for these first; only fall back to direct CString::new etc. when the format genuinely needs something none of the other formats does.

Structs

ParamCStrings

CStrings derived from a single ParamInfo. All four conversions follow the same pattern (unwrap_or_default() so a \0 in metadata degrades to an empty C string instead of panicking the host); pulling them into one struct keeps the per-format vtable loops uniform.

Functions

default_io_channels

(input_channels, output_channels) for the plugin’s default bus layout, or None when the plugin declares no layouts. Used by every format’s vtable / descriptor to advertise channel counts at registration time.

first_bus_layout

Pick the plugin’s first bus layout, or None when the plugin declares no layouts. Used by wrappers (AAX, VST2) that need to read the layout before host-side bus-config negotiation, where a missing layout would otherwise produce silently-misreported channel counts.

log_missing_bus_layout

Standard diagnostic emitted by register_* when first_bus_layout or default_io_channels returns None. Centralised so every wrapper prints the same actionable message.

run_audio_block

Run a per-block audio-thread body under std::panic::catch_unwind.

run_audio_block_with

Like run_audio_block but for callbacks that return a status code. Returns body’s value on a clean exit, fallback if the body panicked. Used by the CLAP wrapper, whose process callback returns a clap_process_status i32.

run_extern_callback_with

Run a generic extern "C" callback body under std::panic::catch_unwind. Returns body’s value on a clean exit, fallback if the body panicked.

run_register

Run a register_* body under std::panic::catch_unwind.