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Changes tracker timing from beat-based to unit-less system to separate
musical structure from BPM-dependent playback speed.
TIMING CONVENTION:
- 1 unit = 4 beats (by convention)
- Conversion: seconds = units * (4 / BPM) * 60
- At 120 BPM: 1 unit = 2 seconds
BENEFITS:
- Pattern structure independent of BPM
- BPM changes only affect playback speed, not structure
- Easier pattern composition (0.00-1.00 for typical 4-beat pattern)
- Fixes issue where patterns played for 2s instead of expected duration
DATA STRUCTURES (tracker.h):
- TrackerEvent.beat → TrackerEvent.unit_time
- TrackerPattern.num_beats → TrackerPattern.unit_length
- TrackerPatternTrigger.time_sec → TrackerPatternTrigger.unit_time
RUNTIME (tracker.cc):
- Added BEATS_PER_UNIT constant (4.0)
- Convert units to seconds at playback time using BPM
- Pattern remains active for full unit_length duration
- Fixed premature pattern deactivation bug
COMPILER (tracker_compiler.cc):
- Parse LENGTH parameter from PATTERN lines (defaults to 1.0)
- Parse unit_time instead of beat values
- Generate code with unit-less timing
ASSETS:
- test_demo.track: converted to unit-less (8 score triggers)
- music.track: converted to unit-less (all patterns)
- Events: beat/4 conversion (e.g., beat 2.0 → unit 0.50)
- Score: seconds/unit_duration (e.g., 4s → 2.0 units at 120 BPM)
VISUALIZER (track_visualizer/index.html):
- Parse LENGTH parameter and BPM directive
- Convert unit-less time to seconds for rendering
- Update tick positioning to use unit_time
- Display correct pattern durations
DOCUMENTATION (doc/TRACKER.md):
- Added complete .track format specification
- Timing conversion reference table
- Examples with unit-less timing
- Pattern LENGTH parameter documentation
FILES MODIFIED:
- src/audio/tracker.{h,cc} (data structures + runtime conversion)
- tools/tracker_compiler.cc (parser + code generation)
- assets/{test_demo,music}.track (converted to unit-less)
- tools/track_visualizer/index.html (BPM-aware rendering)
- doc/TRACKER.md (format documentation)
- convert_track.py (conversion utility script)
TEST RESULTS:
- test_demo builds and runs correctly
- demo64k builds successfully
- Generated code verified (unit-less values in music_data.cc)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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- Change SCORE triggers from every 2s to every 4s (0.0, 4.0, 8.0, 12.0)
- Patterns are 4 beats (2 seconds at 120 BPM), now properly spaced
- Total duration: 16 seconds (4 patterns × 4 seconds)
- Regenerate test_demo_music.cc
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Implements minimal standalone executable for debugging audio/visual
synchronization and variable tempo system without full demo complexity.
Key Features:
- Simple drum beat (kick-snare) with crash landmarks at bars 3 and 7
- NOTE_A4 (440 Hz) reference tone at start of each bar for testing
- Screen flash effect synchronized to audio peaks
- 16 second duration (8 bars at 120 BPM)
- Variable tempo mode (--tempo) alternating acceleration/deceleration
- Peak logging (--log-peaks) for gnuplot visualization
Command-line options:
- --help: Show usage information
- --fullscreen: Run in fullscreen mode
- --resolution WxH: Set window resolution
- --tempo: Enable tempo variation test (1.0x ↔ 1.5x and 1.0x ↔ 0.66x)
- --log-peaks FILE: Export audio peaks with beat timing for analysis
Files:
- src/test_demo.cc: Main executable (~220 lines)
- assets/test_demo.track: Drum pattern with NOTE_A4
- assets/test_demo.seq: Visual timeline (FlashEffect)
- test_demo_README.md: Comprehensive documentation
Build: cmake --build build --target test_demo
Usage: build/test_demo [--help] [--tempo] [--log-peaks peaks.txt]
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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