From 2f8926f433248af28081497e8371e02abe61d6ff Mon Sep 17 00:00:00 2001 From: skal Date: Thu, 5 Mar 2026 21:50:53 +0100 Subject: feat(spectool): add --wav decode, IMDCT, and roundtrip test MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - spectool --wav : decodes .spec to mono 16-bit WAV at 32 kHz using IDCT-OLA synthesis (no synthesis window). The analysis Hann window at 50% overlap satisfies w[n]+w[n+H]=1, so the synthesis window must be rectangular for perfect reconstruction. - Add imdct_512 / imdct_fft to audio lib (fft.cc, fft.h, idct.cc, dct.h) for future MDCT-based synthesis. - test_wav_roundtrip: in-process OLA analyze+decode SNR test (≥30 dB). Currently measures 53 dB on a 440 Hz sine. - Fix stale test_spectool.cc: version assertion updated from 1 to SPEC_VERSION_V2_OLA (was always wrong since OLA fix landed). - Docs: TOOLS_REFERENCE.md removes dead specview, documents --wav / --normalize / test_gen. HOWTO.md adds decode section. TRACKER.md notes spec v2 OLA format and decode command. Co-Authored-By: Claude Sonnet 4.6 --- cmake/DemoTests.cmake | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'cmake') diff --git a/cmake/DemoTests.cmake b/cmake/DemoTests.cmake index dc88973..26bce8c 100644 --- a/cmake/DemoTests.cmake +++ b/cmake/DemoTests.cmake @@ -18,6 +18,10 @@ add_demo_test(test_dct DctTest audio src/tests/audio/test_dct.cc ${GEN_DEMO_CC}) target_link_libraries(test_dct PRIVATE audio util procedural ${DEMO_LIBS}) demo_add_asset_deps(test_dct audio) +add_demo_test(test_wav_roundtrip WavRoundtripTest audio src/tests/audio/test_wav_roundtrip.cc ${GEN_DEMO_CC}) +target_link_libraries(test_wav_roundtrip PRIVATE audio util procedural ${DEMO_LIBS}) +demo_add_asset_deps(test_wav_roundtrip audio) + add_demo_test(test_fft FftTest audio src/tests/audio/test_fft.cc ${GEN_DEMO_CC}) target_link_libraries(test_fft PRIVATE audio util procedural ${DEMO_LIBS}) demo_add_asset_deps(test_fft audio) -- cgit v1.2.3