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@vorlie vorlie released this 31 Dec 07:55
· 43 commits to main since this release
v1.3
cd94395

Plasmoid Visualizer v1.3

Oscilloscope Visualizer Modes

New visualization modes for audio analysis:

  • Waveform Mode - Display raw audio as a centered time-domain waveform
  • Oscilloscope XY Mode - Map stereo channels to X/Y coordinates for Lissajous figures

Stabilization Features:

  • Zero-crossing trigger detection for both Waveform and XY modes
  • Smooth trigger interpolation to eliminate jitter
  • Adjustable time scale slider (0.2x - 2.0x zoom) for detailed waveform inspection

Video Export

Offline rendering:

  • Export visualizations directly to MP4 video files
  • FFMPEG integration with stdin piping for efficient processing
  • Configurable resolution (custom width/height)
  • Adjustable framerate (30/60 FPS)
  • Perfect audio sync using precise sample-rate calculations
  • Automatic vertical flip correction for OpenGL coordinate system
  • Progress indication during rendering

CRT Oscilloscope Aesthetics

Authentic oscilloscope visual effects:

  • Multi-pass glow rendering (3-layer halo effect)
  • Phosphor persistence/decay simulation
  • Square aspect ratio enforcement (1:1) for XY mode
  • Adjustable glow intensity and decay rates

Multi-Channel Test Tone Generation

Enhanced test tone capabilities:

  • Stereo Mode - Independent L/R channel frequency control
  • Separate frequency sliders for Left and Right channels (20Hz - 2kHz)
  • Perfect for creating classic Lissajous patterns (1:2, 2:3, 3:4 ratios)
  • All waveform types available in stereo (Sine, Square, Sawtooth, Triangle, Noise)

XY Transformation Controls

Advanced Lissajous pattern manipulation:

  • Rotation - 0-360° continuous rotation slider
  • Flip Horizontal - Mirror pattern on X-axis
  • Flip Vertical - Mirror pattern on Y-axis
  • Combinable transformations for viewing patterns from any angle

Technical Improvements

  • Audio Engine Enhancements
  • Robust device initialization with resetDevice() helper
  • Fixed double-initialization crash when switching audio modes
  • Added readAudioFrames() for random-access audio reading (video export)
  • Implemented stereo buffer capture (getStereoBuffer())
  • Independent phase tracking for Left/Right test tone channels
  • Sample-rate aware rendering for non-44.1kHz files

UI/UX Improvements

  • Cached device enumeration to prevent per-frame overhead
  • Manual "Refresh Devices" button
  • Dynamic UI controls (Time Scale, Rotation, Flip) visible only for relevant modes
  • Stereo mode checkbox with conditional L/R frequency sliders
  • Render Video dialog with progress tracking

Code Quality

  • Refactored main loop logic into reusable updateVisualizer() and renderFrame() helpers
  • Consistent transformation pipeline: Gain → Aspect → Rotation → Flip → Clamp
  • Exception handling with graceful degradation
  • Clean separation between live rendering and offline video export paths

Visual Demonstrations

The Oscilloscope XY mode with CRT glow effects produces stunning Lissajous figures:

  • Circle (L=440Hz, R=440Hz, 0° phase)
  • Figure-8 (L=440Hz, R=880Hz, 1:2 ratio)
  • Trefoil (L=440Hz, R=660Hz, 2:3 ratio)
  • Use Rotation + Flip controls to view these patterns from any perspective

Related commits: cd94395, d48c666, d23d9d7, 9f89651

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