spicetools/hooks/audio/audio.cpp

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2024-08-28 15:10:34 +00:00
#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 VOLUME_HOOK_ENABLED = true;
bool USE_DUMMY = false;
WAVEFORMATEXTENSIBLE FORMAT {};
std::optional<Backend> BACKEND = std::nullopt;
size_t ASIO_DRIVER_ID = 0;
bool ASIO_FORCE_UNLOAD_ON_STOP = false;
// private globals
IAudioClient *CLIENT = nullptr;
std::mutex INITIALIZE_LOCK; // for asio
}
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");
init_low_latency();
// general hooks
CoCreateInstance_orig = detour::iat_try("CoCreateInstance", CoCreateInstance_hook);
}
void stop() {
log_info("audio", "stopping");
if (CLIENT) {
CLIENT->Stop();
CLIENT->Release();
CLIENT = nullptr;
}
stop_low_latency();
}
}