feat(host/windows): host→client Opus audio — vendored libopus on MSVC

The `m3` audio_thread (desktop capture → Opus 48 kHz stereo 5 ms CBR → AUDIO_MAGIC datagrams) now runs on Windows, fed by the WASAPI loopback capturer. The `opus` crate vendors libopus via `audiopus_sys` + cmake (no system lib / vcpkg), so it builds on MSVC — moved into a `cfg(any(linux, windows))` deps table and widened the audio_thread cfg to match (the stub now only covers other targets, e.g. macOS). Build note: CMake 4 rejects libopus's old `cmake_minimum_required`; set `CMAKE_POLICY_VERSION_MINIMUM=3.5` when building the host on Windows. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-15 07:30:00 +00:00
parent 8c8d576e52
commit b8a1b7e469
3 changed files with 12 additions and 12 deletions
@@ -28,13 +28,9 @@ Every OS-touching backend is implemented behind the existing traits and **builds
 | NVENC (D3D11, `--features nvenc`) | ✅ compiles+links | needs a GPU at runtime |
 | Run host (serve/m3-host) | ✅ live | m3-host starts + listens; `c_abi_connection_roundtrip` passes |
 | Gamepad (ViGEm) | ✅ done | compiles; live needs ViGEmBus + a physical pad; rumble back-channel TODO |
-| Host→client audio wiring | ⬜ blocked | `opus` crate links *system* libopus (not on MSVC) |
+| Host→client audio wiring | ✅ done | builds on MSVC; `m3` `audio_thread` active on Windows (silent VM → no samples to send) |

 **Remaining for full parity:**
- **Host→client Opus audio** — the WASAPI capture backend is done + init-validated, but the `m3`
-  `audio_thread` stays Linux-gated because the `opus` crate links *system* libopus, absent on MSVC.
-  Finish by providing libopus on MSVC (vcpkg) or switching `audio_thread` to a vendoring Opus crate
-  (audiopus/magnum-opus build libopus from C source), then widen the `audio_thread` cfg.
 - **ViGEm rumble back-channel** (`Xbox360Wired::request_notification`) — small; needs a physical pad.
 - **Live GPU/in-session validation** — SudoVDA monitor activation, DXGI capture, NVENC encode, and
  SendInput injection all need a real GPU and an interactive (console) session, not SSH/Session-0.
@@ -59,6 +55,8 @@ Every OS-touching backend is implemented behind the existing traits and **builds
 (Gitea). Sync uncommitted files with **sftp** (`sftp -b - host`, `/C:/...` paths — scp and
 base64-over-ssh are unreliable here). Commit on Linux → `git reset --hard origin/main` on the VM.
 Build env: `PATH` += cargo bin + NASM + CMake + LLVM (vcvars not needed — rustc/cc self-locate MSVC).
+Set `CMAKE_POLICY_VERSION_MINIMUM=3.5` — CMake 4 rejects libopus's old `cmake_minimum_required` when
+`audiopus_sys` (vendored by the `opus` crate) builds libopus from source for the host→client audio path.

 ## Decisions (locked 2026-06-14)