如何查找已连接的音频设备?

Question

我正在尝试查找连接到计算机的音频设备（输入和输出）。我想将我的默认音频从耳机切换到扬声器并返回。

文档感觉是周期性的，告诉我我需要使用 IMMDeviceCollection 来枚举我的设备，但要获取集合，我需要将其提供给 IMMDevicenumerator，但它不能为空，否则会抛出错误/警告。

简而言之，如何列出我的音频设备？如何切换被视为默认音频终结点的内容？

void AudioControl::getDevices()
{
                IMMDeviceEnumerator* deviceEnumerator = NULL;
                IMMDeviceCollection* deviceCollection = NULL;

                HRESULT hr = CoInitialize(NULL);
                if (SUCCEEDED(hr))
                {
                                std::cout << "Initialized" << std::endl;
                                hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), (void**)&deviceEnumerator);
                                if (SUCCEEDED(hr))
                                {
                                                std::cout << "Created instance" << std::endl;
                                                hr = deviceEnumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, (IMMDeviceCollection**)deviceCollection);
                                                if (SUCCEEDED(hr))
                                                {
                                                                if (deviceCollection != NULL)
                                                                {
                                                                                std::cout << "Enumerated devices" << std::endl;
                                                                                std::wcout << "Devices: " << deviceCollection << std::endl;
                                                                                std::wcout << "Type: " << typeid(deviceCollection).name() << std::endl;
                                                                }
                                                }
                                                std::cout << "Done enumerating devices" << std::endl;
                                }
                }
                deviceCollection->Release();
                deviceEnumerator->Release();
                CoUninitialize();

}

 

此问题由: How to find audio devices that are connected - Microsoft Q&A总结而来

Answer 1

你好,

欢迎来到 Microsoft Q&A！

IMMDeviceEnumerator：：EnumAudioEndpoints 方法返回一个 IMMDeviceCollection 接口，该接口表示多媒体设备资源的集合。该代码示例打印系统中所有音频呈现终结点设备的显示名称。另请参阅示例。

若要设置默认音频终结点，请参阅 example（IPolicyConfig） 。

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