Implements the WASAPI render-hook (hook/src/audio_hook.{hpp,cpp}) and an
in-process self-test that proves COM vtable discovery and GetBuffer/ReleaseBuffer
interception with no game and no second Steam account.
- audio_hook.cpp: anchors on IMMDevice::Activate (idx 3) off our own default
endpoint (shared vtable), then hooks IAudioClient::Initialize (3) /
GetService (14) and IAudioRenderClient::GetBuffer (3) / ReleaseBuffer (4) off
live game pointers. Copies primary-stream frames into the audio ring and
releases with AUDCLNT_BUFFERFLAGS_SILENT (+ memset belt-and-suspenders), only
while the host-owned capture_enabled flag is set. Stream counting runs always;
on a ring overrun it keeps playing locally rather than going silent.
- ipc_client.hpp: publish_audio_stream / note_audio_frames /
set_audio_streams_seen write the render-stream debug fields into HookStatus.
- tests/audio_hook_test.cpp: installs the hooks, renders a tone through WASAPI
in-process, and asserts exactly one stream, frames pushed to the ring, the
ring carries the non-silent tone, and the primary was silenced. PASS:
streams_seen=1, frames_captured=32640.
- plan doc: correct GetService vtable index 13 -> 14 (SetEventHandle is 13).
coop_hook DLL wiring + host consumer/fallback come next (M3).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
First milestone of the injection render-hook audio path (see
docs/audio-render-hook-plan.md) that fixes the local audio echo without a
virtual device.
- common/include/coop/audio_ring.hpp: new lock-free SPSC shared-memory ring
for PCM, separate from the input/status SharedBlock. Free-running 64-bit
positions (release/acquire), format handshake, host-owned capture_enabled
gate, drop-whole-packet overrun policy.
- common/include/coop/protocol.hpp: add AudioStreamInfo + audio_streams_seen /
audio_streams[] to the always-present HookStatus for the render-stream-count
debug view; bump kProtocolVersion 3->4 (new members appended).
- tests/audio_ring_test.cpp: in-process unit test (push/pop integrity,
wrap-around, format handshake, overrun/drop). No hook or audio device.
- docs/audio-render-hook-plan.md: the green-lit design this implements.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Mirror the real game's audio so Steam Remote Play Together (which streams the
host's own audio session) carries it to the guest. The host captures the game
by PID via WASAPI process loopback and re-renders it on the default endpoint;
the game still plays locally too (accepted "double audio" for now).
- ProcessLoopbackCapture: process-loopback capture client, frame-sink + stats.
The completion handler must be agile (IAgileObject) or
ActivateAudioInterfaceAsync rejects every call with E_ILLEGAL_METHOD_CALL.
- AudioMirror: wraps capture with an event-driven render client and a primed
ring buffer; AudioPanel drives it from the injected game's window/PID.
- coop_tone: standalone WASAPI sine-wave process used as a known audio source.
- audio_loopback_test (CTest): captures coop_tone by PID and asserts non-silent
audio arrives, so the path is verifiable without a second Steam account.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The host can now inject coop_hook.dll into a running game and forward
controller state to it over shared memory, so the game reads the host's
(eventually the guest's) input and nothing else.
- hook/: coop_hook.dll. DllMain spawns a worker that opens the shared-memory
channel (named by the game's pid) and installs SafetyHook inline hooks on
XInputGetState/GetStateEx/GetCapabilities/SetState. Detours synthesize state
from shared memory; unmanaged slots report disconnected, hiding physical pads.
- host/: process picker (Toolhelp32), CreateRemoteThread(LoadLibraryW) injector
with an IsWow64Process2 bitness guard, IPC server publishing pads each frame,
and an ImGui Injection panel wiring it together.
- tests/: hook_selftest exercises the IPC seqlock + hook detours in-process
(no game/controller needed); passes.
Build: SafetyHook wired in (COOP_BUILD_HOOK=ON), Zydis via FetchContent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
