Using the input port, an application like a music player records the audio signals and sends the message to a destination software program, such as a sound analyzer or processor. The tool package introduces the concept of ‘virtual cables’, which denotes a set of virtual devices containing output and input ports. While this program acts like a bridge, the applications are able to transfer audio streams among themselves. In simple terms, Virtual Audio Cable is a versatile audio driver specifically designed to connect multiple audio apps. For everything to work properly, the applications you use with Virtual Audio Cable should be able to support custom audio output devices. This allows the client to treat a filter graph as a single filter, thereby avoiding complexities of graph management such as inter-filter communication.It’s important to understand, though, that the audio software’s efficiency depends on other apps’ settings. When asked by a client to instantiate a particular pin on a virtual device, SysAudio constructs the graph automatically and manages the graph's internal pin connections transparently to the client. Adapter drivers should not register themselves in this category.Ī SysAudio client can treat a filter factory for a virtual audio device similarly to a filter factory for a hardware or software component.

SysAudio reserves the registry category KSCATEGORY_AUDIO_DEVICE exclusively for its virtual audio devices. The KsStudio utility in the Windows Driver Kit (WDK) is an example of an application that bypasses SysAudio and allows users to construct filter graphs manually.įollowing PnP device enumeration, SysAudio takes stock of the registered audio hardware and software components in order to determine how to construct the various audio filter graphs that its clients might require.Īfter determining the list of filter graphs that it can build from the available hardware and software components, SysAudio registers these graphs as virtual audio devices for playback, recording, MIDI input/output, and mixing. SysAudio's clients include DirectSound and the WDMAud system driver, which serves as the interface between WDM audio drivers and the audio-specific Microsoft Windows Multimedia APIs waveIn, waveOut, midiIn, midiOut, mixer, and aux (described in Microsoft Windows SDK documentation). The system audio driver (SysAudio) uses the available hardware and software components to determine the filter graphs to build.įor more information about the system audio driver, see SysAudio System Driver. Virtual audio devices represent the filter graphs that render and capture audio content.

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