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Changelog

All notable user-facing changes should be documented here. LAC is still experimental, so format and API compatibility changes must be called out explicitly.

Unreleased

  • Added public maintainer workflow, contributor guidance, issue templates, PR checklist, support policy, and release checklist.
  • Added CI coverage for Debug tests, Release builds, and ASan/UBSan smoke tests on GitHub Actions.
  • Added self-contained generated WAV fixtures for clean-checkout CI test runs.
  • Updated E2E tests to read back temporary .lac files before decode.
  • Added codec worker limiting through LAC_THREADS and lac_cli encode|decode --threads=N.
  • Clarified the CLI-first PCM WAV roundtrip contract and canonical restored-WAV behavior.
  • Hardened WAV parsing against inconsistent RIFF sizes, malformed chunk boundaries, non-canonical PCM metadata, empty payloads, and unchecked data-chunk allocation.
  • Hardened .lac decoding against non-canonical reserved fields, stereo flags, residual metadata, padding, trailing payload bytes, out-of-range restored samples, oversized decoded allocations, and malformed Rice values.
  • Added generated lac_cli subprocess roundtrips, full supported WAV-domain generated fixtures, and malformed-input regression coverage.
  • Rejected encode or decode commands whose output path refers to the input file.
  • Fixed canonical RIFF padding for odd-sized restored PCM payloads and tightened close-time write error handling.
  • Bounded tiny-block decoder work, made extreme zigzag decoding portable, and corrected the LPC reconstruction specification.
  • Staged CLI output beside the requested path and published it only after successful close, preserving existing files and linked targets on failed writes.
  • Added format version 3 compressed block boundaries and bounded parallel decode while retaining serial decode compatibility for canonical version 2 streams.
  • Switched encode planning to bounded 16384-sample windows, added sampled automatic stereo probes for ambiguous blocks, and reduced residual estimation and Rice bit-output work.
  • Removed tracked editor cache files and generated compile database symlink from source control.
  • Expanded repository roadmap tracking for correctness, fuzzing, security hardening, and release readiness.

v1.4.0

  • Current public release.
  • Experimental .lac format version 2.
  • Supports PCM WAV roundtrips for the documented 16-bit and 24-bit mono/stereo domain.
  • Includes LPC, fixed, and FIR predictors; adaptive Rice coding; zero-run and small-residual modes; block partitioning; mid/side stereo; NEON paths where available; and multithreaded block encoding.