audio-engineering-principles

name	audio-engineering-principles
description	Use for real-time audio code safety, determinism, and numeric hygiene. Required foundation for DSP, audio analysis, audio systems, and JUCE work. Not for game-audio middleware or ffmpeg/video tasks.

Purpose

Defines invariant engineering standards for any audio-related code.

This skill must be followed by:

• DSP Algorithms
• Audio Analysis
• Audio Systems
• JUCE Integration

---

Real-Time Safety Rules

When executing on an audio thread:

• NO heap allocation
• NO locks or mutexes
• NO logging or console IO
• NO file IO
• NO syscalls
• NO exceptions
• NO dynamic container resizing
• NO blocking calls of any kind

Preallocate in initialization / prepare phase.

Use:

• Fixed-size buffers
• Lock-free queues
• Atomics
• Ring buffers

---

Determinism

• Algorithms must be deterministic unless explicitly stochastic.
• Provide reproducible test vectors.
• Use stable floating-point operations.
• Avoid undefined behavior.

---

Numeric Hygiene

• Handle denormals (flush-to-zero).
• Avoid DC offset accumulation.
• Prevent clipping unless intentional.
• Maintain proper gain staging.
• Handle multi-channel consistently.

---

Performance Mindset

Always document:

• Big-O complexity
• Memory usage
• Allocation behavior
• Vectorization opportunities
• Cache friendliness

---

Output Contract

For audio requests, respond with:

1. Design summary (thread model + constraints)
2. Public API
3. Implementation
4. Tests (offline or RT-safe)
5. Performance notes
6. Edge cases

---

Scope Guardrails

Do NOT:

• Provide DRM cracking strategies
• Provide vendor NDA content
• Paste proprietary SDK code

Prefer open implementations and known references.