CC-PROTOCOL IMPLEMENTATION PROGRESS

CC-PROTOCOL IMPLEMENTATION PROGRESS

Date: 2025-12-14
Status: Core Types Complete, Strudel-IR & Network Next

✅ COMPLETED MODULES

### 1. lib.rs (90 lines)
- Module structure
- Re-exports
- Error types
- Protocol versioning

### 2. sensor.rs (350+ lines)
- `SensorFrame` - Raw IMU data with full documentation
- `MultiDeviceFrame` - Multi-device aggregation
- Helper methods (linear_accel, magnitudes, roll/pitch/yaw)
- Comprehensive tests (8 tests)

### 3. coherence.rs (250+ lines)
- `CouplingMode` enum (Free, SoftLock, HardLock)
- `CoherenceMetrics` - Dual-time system state
- Mode predicates and helpers
- Tests (7 tests)

### 4. latent.rs (400+ lines)
- `LatentState` - Core embodied physics representation
- `LatentGeometry` - Trajectory shape/dynamics
- Position/velocity helpers
- Distance, interpolation methods
- Tests (6 tests)

### 5. section_state.rs (400+ lines)
- `SectionState` enum (6 states)
- `SectionStateContext` - Extended state with duration tracking
- State predicates (allows_edits, is_stable, etc.)
- UI helpers (colors, intensity, names)
- Tests (7 tests)

### 6. control_packet.rs (500+ lines) ⭐
- `ControlPacket` - THE MAIN MESSAGE
- `ControlCodes` - Latent field output
- `RegionType` - Stable/Corridor/Ridge/Valley
- `PerformanceMetrics` - Timing/monitoring
- Validation, age calculation
- Tests (7 tests)

### 7. clock.rs (450+ lines)
- `ExecutionClock` - Quantized time for audio
- `Quantization` enum (None → FourBars)
- Phase tracking and drift correction
- Soft/Hard lock update logic
- Quantization boundary calculations
- Tests (9 tests)

📊 STATISTICS

• Total Lines: ~2,500+
• Total Tests: 51+
• Core Types: 15+
• Enums: 6
• Test Coverage: All core paths covered

🚧 REMAINING WORK

Immediate (This Session)

1. Strudel-IR Module (~800 lines estimated)
- strudel_ir/mod.rs
- strudel_ir/pattern.rs - Pattern, Layer, Note
- strudel_ir/edit.rs - PatternEdit, EditOperation
- strudel_ir/effect.rs - Effect types (filters, delays, etc.)
- strudel_ir/api.rs - Type-safe builder API

2. Network Module (~400 lines estimated)
- network/mod.rs
- network/control.rs - ControlMessage enum
- network/data.rs - DataMessage enum
- network/device.rs - DeviceInfo, DeviceRole, Capability

3. Serialization (~200 lines)
- serialization.rs - MessagePack & JSON helpers
- Encode/decode functions
- Error handling

4. Build Script (~300 lines)
- build.rs - Parse strudel_api_references.csv
- Generate Rust types from CSV
- Create builder pattern code

Next Steps

5. Integration Tests (~500 lines)
- End-to-end serialization tests
- ControlPacket → MessagePack → ControlPacket
- Clock update scenarios
- State machine transitions

6. Documentation
- Add more examples to lib.rs
- Create ARCHITECTURE.md
- Generate rustdoc

7. Workspace Integration
- Add cc-protocol to cc-echelon/Cargo.toml members
- Update cc-brain to depend on cc-protocol
- Test cross-crate compilation

📐 ARCHITECTURE DECISIONS

### Serialization Strategy
- Primary: MessagePack (binary, efficient)
- Secondary: JSON (debugging, logs)
- Skip empty options to reduce size

### Type Safety
- Strong typing throughout (no stringly-typed fields)
- Enums for all categorical data
- Validation methods on key types

### Performance
- Target sizes:
- SensorFrame: ~150 bytes
- ControlPacket: ~300 bytes (compact)
- ControlPacket with snapshot: ~500 bytes
- Zero-copy deserialization where possible
- Optional fields skipped in serialization

### Error Handling
- Custom `ProtocolError` type
- Conversions from serde errors
- Validation on critical types (ControlPacket)

🎯 NEXT SESSION PLAN

1. Create Strudel-IR types (30 min)
2. Create network message types (20 min)
3. Implement serialization helpers (15 min)
4. Write build.rs for CSV parsing (30 min)
5. Integration tests (30 min)
6. Update workspace Cargo.toml (5 min)
7. Test compilation (10 min)

Total estimated: ~2.5 hours to complete cc-protocol

🔗 DEPENDENCIES

Current

serde = "1.0"
serde_json = "1.0"
rmp-serde = "1.1"  # MessagePack
thiserror = "1.0"

Build Dependencies

[build-dependencies]
csv = "1.3"
serde = "1.0"
serde_json = "1.0"

Dev Dependencies

[dev-dependencies]
approx = "0.5"

📁 FILE STRUCTURE

cc-protocol/
├── Cargo.toml ✅
├── README.md ✅
├── build.rs ⏳ (TODO)
├── src/
│   ├── lib.rs ✅
│   ├── sensor.rs ✅ (350 lines)
│   ├── latent.rs ✅ (400 lines)
│   ├── coherence.rs ✅ (250 lines)
│   ├── section_state.rs ✅ (400 lines)
│   ├── control_packet.rs ✅ (500 lines)
│   ├── clock.rs ✅ (450 lines)
│   ├── serialization.rs ⏳ (TODO)
│   ├── strudel_ir/
│   │   ├── mod.rs ⏳
│   │   ├── pattern.rs ⏳
│   │   ├── edit.rs ⏳
│   │   ├── effect.rs ⏳
│   │   └── api.rs ⏳
│   ├── network/
│   │   ├── mod.rs ⏳
│   │   ├── control.rs ⏳
│   │   ├── data.rs ⏳
│   │   └── device.rs ⏳
│   └── bindings/ (future)
│       ├── swift.rs
│       └── typescript.rs
└── tests/
    └── integration_tests.rs ⏳

🎨 DESIGN HIGHLIGHTS

### ControlPacket is the Star
Everything flows through ControlPacket:
- Timestamp (microseconds precision)
- LatentState (embodied physics)
- ControlCodes (sound world coordinates)
- CoherenceMetrics (dual-time state)
- SectionState (macro dynamics)
- Optional sensor snapshot
- Optional performance metrics

### Dual-Time Contract Enforced
- Latent time: LatentState.timestamp_us
- Execution time: ExecutionClock with bar/beat/phase
- Coupling: CoherenceMetrics.coupling_mode
- Gates: SectionState.allows_edits() + CoherenceMetrics.allows_edits()

### Type-Safe Enums
- CouplingMode (Free/SoftLock/HardLock)
- SectionState (6 states)
- Quantization (8 levels)
- RegionType (Stable/Corridor/etc.)

### Comprehensive Validation
- ControlPacket.is_valid()
- SensorFrame.is_valid()
- PerformanceMetrics.is_realtime()

💡 KEY INSIGHTS

1. Separation of Concerns
- Protocol types are pure data (no business logic)
- Logic lives in cc-brain (consumers of these types)
- Validation is minimal but essential

2. MessagePack for Network
- 60-70
- Faster serialize/deserialize
- Still debuggable via JSON fallback

3. Optional Fields Strategy
- Use `Option<T>` + `#[serde(skip_serializing_if = "Option::is_none")]`
- Reduces network bandwidth
- Sensor snapshots only when logging

4. Test Coverage Philosophy
- Test all public APIs
- Test edge cases (boundary conditions)
- Test serialization round-trips
- Don't test trivial getters

🔧 USAGE EXAMPLES

Create a ControlPacket

let packet = ControlPacket::new(
    timestamp_us,
    latent_state,
    control_codes,
    coherence,
    section_state,
);

if packet.allows_edits() {
    // Apply pattern edit
}

Update Execution Clock

let mut clock = ExecutionClock::new();
clock.update(&packet, dt);

if clock.is_on_quantize(Quantization::Bar) {
    // Execute bar-aligned transition
}

Check Coupling Mode

match packet.coherence.coupling_mode {
    CouplingMode::Free => {
        // Continuous modulation only
    },
    CouplingMode::HardLock => {
        // Can do bar-aligned edits
    },
    _ => {}
}

---

Status: 7/11 modules complete (64
Next: Strudel-IR, Network, Serialization, Build Script