test(app): add FFT-based frequency preservation tests for AudioMixer#57
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test(app): add FFT-based frequency preservation tests for AudioMixer#57
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Prevent "Mickey Mouse voice" bugs where wrong sample rate ratios shift audio frequencies during resampling. Uses vDSP FFT to verify a 440Hz sine tone survives the full resample pipeline unchanged. 7 new tests: - 48k→16k, 44.1k→16k, 16k→16k frequency preservation - Negative test: wrong source rate must shift frequency - File round-trip (saveWAV → resampleFile → load → FFT) - WAV header sample rate correctness (48k, 16k, 44.1k) - M4A fixture → 16k frequency preservation
pasrom
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Summary
Test plan
swift testpasses./scripts/lint.shpasses