Module subprocess 

Shared subprocess + file-IO primitives for the file-driven codec adapters.

The generic external-codec adapter (crate::adapters_external, which drives any conformant codec via the file-based CLI contract of SPEC/OpenECS-v1.0.md §6) — and any vendor adapter that shells out to a specific codec binary — need the same handful of building blocks:

• ScratchDir — a uniquely-named temp directory removed on drop, so concurrent encode/decode calls never collide and cleanup is one remove_dir_all.
• write_edf_bytes — render a per-channel integer signal as a minimal, spec-valid EDF byte image (the default encode-input format).
• reshape_channel_major — split a flat little-endian integer stream (the default decode-output format) into one Vec<i64> per channel, validating the byte length against the declared shape first.
• SampleDtype — the integer width of the raw decode stream.

This module is pure std (no new dependencies beyond serde for the small SampleDtype enum, which the manifest layer deserializes). It is not on the grading hot path — the metric/grade core stays dependency-light.

Structs

ScratchDir

A scratch directory under the system temp dir, removed on drop.

Enums

SampleDtype

Integer width of the raw, channel-major decode stream a conformant codec writes (and that reshape_channel_major reads back).

Functions

reshape_channel_major

Split a flat little-endian, channel-major integer stream into one Vec<i64> per channel.

write_edf_bytes

Build a minimal, spec-valid EDF byte image for signal at rate fs.