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