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- The Plug and Play Software Device Enumerator component provides support for device enumeration. This component supplies the Plug and Play Software Device Enumerator in the swenum.sys file. This component also supplies the machine.inf file, which is a system-supplied INF (information) file for a standard device.
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The first task of a client audio application is to find a suitable audio device to use. The MMDevice API lets clients discover the audio endpoint devices in the system and determine which devices are suitable for the application to use. This API enables clients to retrieve collections of the available endpoint devices and get the capabilities of each device. Header file Mmdeviceapi.h defines the interfaces in the MMDevice API.
An audio adapter might contain several devices—for example, a wave-rendering device and a wave-capture device. These are adapter devices rather than endpoint devices. As mentioned previously, adapter devices are registered by the Plug and Play manager, in contrast with endpoint devices, which are registered by the endpoint manager. Each adapter device typically supports one or more endpoint devices. A rendering endpoint device (for example, headphones) can receive a stream of audio data from a client application, and a capture endpoint device (for example, a microphone) can send an audio stream to a client application.
Before enumerating the endpoint devices in the system, the client must first call the Windows CoCreateInstance function to create a device enumerator. A device enumerator is an object with an IMMDeviceEnumerator interface. For information about CoCreateInstance, see the Windows SDK documentation.
The client calls the IMMDeviceEnumerator::EnumAudioEndpoints method to create a collection of endpoint objects. Each endpoint object represents an audio endpoint device in the system. In this call, the client specifies whether the collection should contain all of the rendering devices in the system, all of the capture devices, or both.
A device collection is an object with an IMMDeviceCollection interface. Each item in a device collection is an endpoint object with at least the following two interfaces:
- An IMMDevice interface. A client obtains a reference to the IMMDevice interface of an endpoint object in a device collection by calling the IMMDeviceCollection::Item method.
- An IMMEndpoint interface. A client obtains a reference to the IMMEndpoint interface of an endpoint object by calling the IMMDevice::QueryInterface method.
After retrieving a collection of endpoint devices, the client can query the properties of the individual devices in the collection to determine their suitability for use. For a code example that shows how to enumerate endpoint devices and query their properties, see Device Properties.
After selecting a suitable device, the client can call the IMMDevice::Activate method to activate the device-specific interfaces in WASAPI, the DeviceTopology API, and the EndpointVolume API.