Let us start here, from square one. No, from Zero!

hooks/audio/audio.cpp

@@ -0,0 +1,87 @@
+#include "audio.h"
+
+#include <vector>
+
+#include <windows.h>
+#include <initguid.h>
+#include <audioclient.h>
+#include <mmdeviceapi.h>
+
+#include "hooks/audio/backends/mmdevice/device_enumerator.h"
+#include "util/detour.h"
+#include "util/logging.h"
+#include "util/memutils.h"
+
+#include "audio_private.h"
+
+#ifdef _MSC_VER
+DEFINE_GUID(CLSID_MMDeviceEnumerator,
+    0xBCDE0395, 0xE52F, 0x467C,
+    0x8E, 0x3D, 0xC4, 0x57, 0x92, 0x91, 0x69, 0x2E);
+#endif
+
+// function pointers
+static decltype(CoCreateInstance) *CoCreateInstance_orig = nullptr;
+
+namespace hooks::audio {
+
+    // public globals
+    bool ENABLED = true;
+    bool USE_DUMMY = false;
+    WAVEFORMATEXTENSIBLE FORMAT {};
+    std::optional<Backend> BACKEND = std::nullopt;
+    size_t ASIO_DRIVER_ID = 0;
+
+    // private globals
+    IAudioClient *CLIENT = nullptr;
+    std::mutex INITIALIZE_LOCK;
+}
+
+static HRESULT STDAPICALLTYPE CoCreateInstance_hook(
+    REFCLSID rclsid,
+    LPUNKNOWN pUnkOuter,
+    DWORD dwClsContext,
+    REFIID riid,
+    LPVOID *ppv)
+{
+    // call original
+    HRESULT ret = CoCreateInstance_orig(rclsid, pUnkOuter, dwClsContext, riid, ppv);
+    if (FAILED(ret)) {
+        if (IsEqualCLSID(rclsid, CLSID_MMDeviceEnumerator)) {
+            log_warning("audio", "CoCreateInstance failed, hr={}", FMT_HRESULT(ret));
+        }
+        return ret;
+    }
+
+    // check if this is the audio device enumerator
+    if (IsEqualCLSID(rclsid, CLSID_MMDeviceEnumerator)) {
+
+        // wrap object
+        auto mmde = reinterpret_cast<IMMDeviceEnumerator **>(ppv);
+        *mmde = new WrappedIMMDeviceEnumerator(*mmde);
+    }
+
+    // return original result
+    return ret;
+}
+
+namespace hooks::audio {
+    void init() {
+        if (!ENABLED) {
+            return;
+        }
+
+        log_info("audio", "initializing");
+
+        // general hooks
+        CoCreateInstance_orig = detour::iat_try("CoCreateInstance", CoCreateInstance_hook);
+    }
+
+    void stop() {
+        if (CLIENT) {
+            CLIENT->Stop();
+            CLIENT->Release();
+            CLIENT = nullptr;
+        }
+    }
+}