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Core: Use extra thread for Cubeb on Windows to not disturb the CoInitialize state of whatever thread happens to call a Cubeb function.

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This commit is contained in:
Admiral H. Curtiss
2022-06-18 05:31:14 +02:00
parent ca10e92ab9
commit e085bf14f9
6 changed files with 190 additions and 109 deletions
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73
Source/Core/AudioCommon/CubebUtils.cpp
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@ -16,49 +16,6 @@
#include <cubeb/cubeb.h>
#ifdef _WIN32
#include <Objbase.h>
#endif
// On Windows, we must manually ensure that COM is initialized in MTA mode on every thread that
// accesses the cubeb API. See the comment on cubeb_init in cubeb.h
// We do this with a thread-local variable that keeps track of whether COM is initialized or not,
// and initialize it if it isn't. When the thread ends COM is uninitialized again.
#ifdef _WIN32
namespace
{
class auto_com
{
public:
auto_com() = default;
auto_com(const auto_com&) = delete;
auto_com(auto_com&&) = delete;
auto_com& operator=(const auto_com&) = delete;
auto_com& operator=(auto_com&&) = delete;
~auto_com()
{
if (m_initialized)
{
CoUninitialize();
}
}
bool initialize()
{
if (!m_initialized)
{
HRESULT result = CoInitializeEx(nullptr, COINIT_MULTITHREADED | COINIT_DISABLE_OLE1DDE);
m_initialized = SUCCEEDED(result);
}
return m_initialized;
}
private:
bool m_initialized = false;
};
} // namespace
static thread_local auto_com tls_com_context;
#endif
static ptrdiff_t s_path_cutoff_point = 0;
static void LogCallback(const char* format, ...)
@ -92,38 +49,8 @@ static void DestroyContext(cubeb* ctx)
}
}
static bool EnsureCubebCallable()
{
#ifdef _WIN32
if (!tls_com_context.initialize())
return false;
#endif
return true;
}
void CubebUtils::RunInCubebContext(const std::function<void()>& func)
{
// Cubeb is documented to require MTA COM mode, so if the current thread was initialized in STA
// mode, we make a temporary thread to execute the cubeb call.
if (EnsureCubebCallable())
{
func();
}
else
{
std::thread([&] {
// this should never fail, so yell loudly if it does
ASSERT(EnsureCubebCallable());
func();
}).join();
}
}
std::shared_ptr<cubeb> CubebUtils::GetContext()
{
if (!EnsureCubebCallable())
return nullptr;
static std::weak_ptr<cubeb> weak;
std::shared_ptr<cubeb> shared = weak.lock();