Native-binding audio smoke

Date: 2026-09-25

Native.Binding.psm1 was parsed and exercised in a clean Windows PowerShell process, then used by Audio.AAudio.psm1 on physical SM8550 and SM8635 devices. Both devices opened 24 kHz mono float streams, wrote and consumed all 6,000 frames, completed drain, and returned zero from close. The SM8550 run reported zero xruns; the SM8635 run reported one startup xrun.

The Windows default render endpoint also accepted a 350 ms buffer through the local QuickPS WASAPI implementation: 48 kHz, stereo, 32-bit, 16,800 frames. The exercised source was QuickPS/src/Wasapi.Windows.ps1, SHA-256 33185FF24A9DFF34450C473924DBE59DF5E570829F8BFF4EAE2DA661D49ADDE6.

A historical staged Kokoro/QNN oracle job was also replayed on the SM8550 to exercise speech-shaped PCM through the new AAudio binding. It produced and played 24,000/24,000 frames with zero xruns, but failed its numerical gate: 6.36 dB audio SNR against the staged oracle. The owner heard the utterance as “tab.” This is not a passing synthesis result and does not promote the historical QNN path into the product.