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feat(host/windows): WASAPI loopback audio capture

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Windows AudioCapturer via the wasapi crate (0.23): loopback the default render endpoint (Render device + Direction::Capture + shared mode => STREAMFLAGS_LOOPBACK) at 48 kHz stereo f32 with autoconvert, feeding the existing Opus path with no resampling. Dedicated COM-MTA thread owns the !Send WASAPI objects; interleaved f32 chunks leave over a bounded lossy channel; RAII Drop stops + joins. Bring-up handshake reports a missing endpoint as Err so a session continues without audio. open_audio_capture Windows factory arm + module. Init chain validated live on the VM (open succeeds; next_chunk waits on a silent system). Virtual mic deferred (no Windows virtual-audio endpoint). m3 audio_thread wiring + opus hoist land with the integration task.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-06-15 00:57:19 +00:00
parent d2e8bae72f
commit 05426e2f20
4 changed files with 214 additions and 2 deletions
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crates/punktfunk-host/Cargo.toml
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@@ -120,3 +120,5 @@ windows = { version = "0.62", features = [
# Software H.264 encoder (GPU-less path + NVENC fallback). The default `source` feature statically
# compiles OpenH264 (BSD-2) — no system lib, builds on MSVC; nasm on PATH adds the SIMD fast path.
openh264 = "0.9"
# WASAPI loopback audio capture (default render endpoint -> 48 kHz stereo f32 for the Opus path).
wasapi = "0.23"