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AudioCommon/WASAPI: Factorize device enumeration logic into a function to greatly reduce code duplication

This commit is contained in:
Silent 2019-08-17 13:08:58 +02:00
parent c373890505
commit 11c5150c16
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GPG Key ID: AE53149BB0C45AF1
1 changed files with 26 additions and 57 deletions
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83
Source/Core/AudioCommon/WASAPIStream.cpp
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@ -77,14 +77,13 @@ static bool HandleWinAPI(std::string_view message, HRESULT result)
return SUCCEEDED(result);
}
std::vector<std::string> WASAPIStream::GetAvailableDevices()
static void ForEachNamedDevice(const std::function<bool(ComPtr<IMMDevice>, std::string)>& callback)
{
HRESULT result = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
// RPC_E_CHANGED_MODE means that thread has COM already initialized with a different threading
// model. We don't necessarily need multithreaded model here, so don't treat this as an error
if (result != RPC_E_CHANGED_MODE && !HandleWinAPI("Failed to call CoInitialize", result))
return {};
return;
wil::unique_couninitialize_call cleanup;
if (FAILED(result))
@ -97,20 +96,17 @@ std::vector<std::string> WASAPIStream::GetAvailableDevices()
IID_PPV_ARGS(enumerator.GetAddressOf()));
if (!HandleWinAPI("Failed to create MMDeviceEnumerator", result))
return {};
return;
ComPtr<IMMDeviceCollection> devices;
result = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, devices.GetAddressOf());
if (!HandleWinAPI("Failed to get available devices", result))
return {};
return;
UINT count;
devices->GetCount(&count);
std::vector<std::string> device_names;
device_names.reserve(count);
for (u32 i = 0; i < count; i++)
{
ComPtr<IMMDevice> device;
@ -128,64 +124,37 @@ std::vector<std::string> WASAPIStream::GetAvailableDevices()
wil::unique_prop_variant device_name;
device_properties->GetValue(PKEY_Device_FriendlyName, device_name.addressof());
device_names.push_back(TStrToUTF8(device_name.pwszVal));
if (!callback(std::move(device), TStrToUTF8(device_name.pwszVal)))
break;
}
}
std::vector<std::string> WASAPIStream::GetAvailableDevices()
{
std::vector<std::string> device_names;
ForEachNamedDevice([&device_names](ComPtr<IMMDevice>, std::string n) {
device_names.push_back(std::move(n));
return true;
});
return device_names;
}
ComPtr<IMMDevice> WASAPIStream::GetDeviceByName(std::string_view name)
{
HRESULT result = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
// RPC_E_CHANGED_MODE means that thread has COM already initialized with a different threading
// model. We don't necessarily need multithreaded model here, so don't treat this as an error
if (result != RPC_E_CHANGED_MODE && !HandleWinAPI("Failed to call CoInitialize", result))
return nullptr;
ComPtr<IMMDevice> device;
wil::unique_couninitialize_call cleanup;
if (FAILED(result))
cleanup.release(); // CoUninitialize must be matched with each successful CoInitialize call, so
// don't call it if initialize fails
ForEachNamedDevice([&device, &name](ComPtr<IMMDevice> d, std::string n) {
if (n == name)
{
device = std::move(d);
return false;
}
return true;
});
ComPtr<IMMDeviceEnumerator> enumerator;
result = CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(enumerator.GetAddressOf()));
if (!HandleWinAPI("Failed to create MMDeviceEnumerator", result))
return nullptr;
ComPtr<IMMDeviceCollection> devices;
result = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, devices.GetAddressOf());
if (!HandleWinAPI("Failed to get available devices", result))
return nullptr;
UINT count;
devices->GetCount(&count);
for (u32 i = 0; i < count; i++)
{
ComPtr<IMMDevice> device;
devices->Item(i, device.GetAddressOf());
if (!HandleWinAPI("Failed to get device " + std::to_string(i), result))
continue;
ComPtr<IPropertyStore> device_properties;
result = device->OpenPropertyStore(STGM_READ, device_properties.GetAddressOf());
if (!HandleWinAPI("Failed to initialize IPropertyStore", result))
continue;
wil::unique_prop_variant device_name;
device_properties->GetValue(PKEY_Device_FriendlyName, device_name.addressof());
if (TStrToUTF8(device_name.pwszVal) == name)
return device;
}
return nullptr;
return device;
}
bool WASAPIStream::Init()