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| author | skal <pascal.massimino@gmail.com> | 2026-02-06 18:08:06 +0100 |
|---|---|---|
| committer | skal <pascal.massimino@gmail.com> | 2026-02-06 18:08:06 +0100 |
| commit | 42390a8a28377cd25021b1647abf9dbd43d4e2c8 (patch) | |
| tree | 174f10bc635754b20764e764f1b9786f50f01f63 /CMakeLists.txt | |
| parent | 8aba6d94871315eac0153134a6c740344964d31f (diff) | |
fix(audio): Fix spectrogram amplification issue and add diagnostic tool
## Root Cause
.spec files were NOT regenerated after orthonormal DCT changes (commit d9e0da9).
They contained spectrograms from old non-orthonormal DCT (16x larger values),
but were played back with new orthonormal IDCT.
Result: 16x amplification → Peaks of 12-17x → Severe clipping/distortion
## Diagnosis Tool
Created specplay tool to analyze and play .spec/.wav files:
- Reports PCM peak and RMS values
- Detects clipping during playback
- Usage: ./build/specplay <file.spec|file.wav>
## Fixes
1. Revert accidental window.h include in synth.cc (keep no-window state)
2. Adjust gen.cc scaling from 16x to 6.4x (16/2.5) for procedural notes
3. Regenerated ALL .spec files with ./scripts/gen_spectrograms.sh
## Verified Results
Before: Peak=16.571 (KICK_3), 12.902 (SNARE_2), 14.383 (SNARE_3)
After: Peak=0.787 (BASS_GUITAR_FEEL), 0.759 (SNARE_909), 0.403 (KICK_606)
All peaks now < 1.0 (safe range)
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index fb8bb7e..2bf4d4a 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -432,6 +432,10 @@ if(DEMO_BUILD_TOOLS OR DEMO_BUILD_TESTS) add_dependencies(spectool generate_tracker_music generate_demo_assets) add_executable(specview tools/specview.cc) + + add_demo_executable(specplay tools/specplay.cc ${PLATFORM_SOURCES} ${GEN_DEMO_CC} ${GENERATED_MUSIC_DATA_CC}) + target_link_libraries(specplay PRIVATE audio util ${DEMO_LIBS}) + add_dependencies(specplay generate_demo_assets) endif() #-- - Global Target Configuration -- - |