Three leaks, all at the relevant choke points:
- ComputeSTFTInit reallocated result->segments without freeing the old
array, and runs twice per load (load site + loadingPhase 0), so every
file load leaked the STFT. Free the previous result at the top.
- LoadWavFile malloc'd signal->samples without freeing the previous
buffer; free it just before the alloc (after all failure returns, so a
failed load never frees the existing signal).
- GenerateSpectrogramTexture overwrote *image with a fresh GenImageColor
without unloading the old one — leaked an image buffer on every reload
and every dB-floor/colormap regen. Unload first (NULL-safe on first use).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add an LRU cache (4 entries) of fully-computed STFT results keyed by FFT
size, so toggling FFT size restores a cached result instead of recomputing.
Fix the segfault that hit right after the loading screen for files long
enough to use a skipFactor > 1 overview: SaveToCache() deep-copied every
segment using segment[0].numBins and memcpy'd from each segment's spectrum,
but a sparse overview leaves most segments with spectrum == NULL, so it
memcpy'd from NULL.
- Add IsSTFTComplete() / CopySTFT() helpers; CopySTFT copies sparse
segments as NULL instead of dereferencing them.
- Only cache complete (full-resolution) results; never the sparse overview.
- Make a cache hit actually skip recomputation (and stop leaking): restore
the cached result, mark it finished, and rebuild the texture. On a miss,
free the current STFT before recomputing.
- Drop the per-frame re-save that ran every frame while zoomed in.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
After initial overview loads, compute full-res segments in the background
while the user is idle (200 segments/frame, pauses on any interaction).
Foreground high-res computes zoomed-in segments immediately for
responsiveness. Computed segments persist — zooming out never recomputes.
Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
- Create primitives.h/c for waveform visualization (time/amplitude display)
- Scope view draws signal as per-pixel min/max envelope (Audacity-style)
- Add draggable divider between spectrogram and scope (30%-80% range)
- Fix selection bounds to use correct spectrogram area (not full viewport)
- Scope syncs with spectrogram zoom/pan for aligned time axis
Display Duration, Energy, Peak amplitude, RMS amplitude, and PAPR for
the current time/frequency selection. The stats box:
- Appears next to the selection box (right side, or left if not enough room)
- Centers vertically on the selection box
- Uses a semi-transparent dark background with yellow border
- Updates live while dragging the selection
- Computed in utils.c with ComputeSignalStats()
Add a red vertical line that tracks playback position within the
selected region. The playhead shows the current position in the
spectrogram as audio plays, making it easy to see what part of
the signal is currently being heard.
- playheadT tracks 0-1 normalized position in the selection
- Red line drawn across the spectrogram viewport while playing
- Semi-transparent red highlight behind the line for visibility
- Reset playhead to 0 when playback stops or is stopped
- Frequency tick/label intervals now adapt to zoom level instead of
always showing 0–Nyquist (5Hz → 10kHz depending on zoom)
- Labels use coarser spacing than ticks to avoid clutter
- Fix segfault when zooming out past signal bounds by properly clamping
freqViewStart/freqViewEnd to [0,1] with correct width preservation
in zoom, pan, and scrollbar drag
- Fix firstTick calculation that was off-by-one
Add Export PNG button and keyboard shortcut (E) to export the
spectrogramImage as a PNG file. Supports:
- Cropping to the current time/frequency selection region
- Optional upscaling via the export scale slider (0.0x to 10.0x)
- Exporting the full unscaled image when no selection and scale is 0
Exports to the app's working directory via raylib's ExportImage.
Export status shown as a brief toast notification.
Known issues:
- Frequency scale doesn't adjust properly when zooming (freqView
clamps to [0,1] range but zoom factor isn't frequency-aware)
- Hardcoded export filenames; no filename/path picker yet
For long signals (>60s), initial load computes every Nth segment at
reduced resolution for a fast overview. Full resolution is computed on
demand as the user zooms into specific regions, starting at the current
viewport and computing 50 segments at a time.
Key changes:
- Add skipFactor and highResFinished fields to SpectrogramApp
- ComputeSTFTInit uses calloc to NULL-initialize segments
- ComputeSTFTIncremental skips non-aligned segments (skipFactor stride)
- ComputeSTFTHighResRange computes full-res for a range [start, end)
- GenerateSpectrogramTexture skips NULL segments for normalization
- Zoom trigger computes high-res only for the visible viewport range,
50 segments at a time, staying within viewStart..viewEnd
- No initial high-res block — only fills on-demand as user explores
Move all Unix-specific syscalls (fork, execvp, waitpid, strerror, /tmp)
into a platform layer so the same spectrogram.c can target Windows
(CreateProcess) and WebAssembly (stubs). Key changes:
- src/platform.h: public API with spawn handle, error codes, path helpers
- src/platform_linux.c: fork/execvp implementation, /tmp, strerror
- src/platform_win32.c: CreateProcess implementation, temp dir lookup
- src/platform_web.c: stub implementations (no subprocess support on web)
- src/spectrogram.c: consume only platform.h; replace pid_t/fork/execvp
with Platform_SpawnChild/WaitForChild; use Platform_GetTempDir() for
/tmp path; replace strdup with malloc/memcpy for portability
- Build: add platform_*.c to gmake, Premake, and build_web.sh
Add FLAG_WINDOW_HIGHDPI to enable raylib's automatic framebuffer
scaling on HiDPI displays. Layout coordinates use logical screen size
only, so UI stays proportional to window size while text and graphics
render at full framebuffer resolution for crisp output on any monitor.
Also fix hardcoded pixel offsets in selection bounds rectangle to use
selScale consistently.
- Add incremental STFT processing with loading overlay and progress bar
- Add auto-scaling amplitude (max dB, max-40dB floor) for low-signal files
- Replace fixed bitmap text with TTF font scaled by window size for crisp rendering at any resolution
- Fix command-line file path resolution relative to original working directory
- Scale file browser dialog dimensions by GetUIScale() to prevent text overlap
- Disable ESC key closing the window
- Fix FFT size changes to restart STFT computation
tyler
Jeffery Myers
Peter0x44
staruwos
Youness SBAI