![]() The following figure shows the user-mode and kernel-mode components that a MIDI application uses to play back MIDI data. ![]() Graph building is transparent to the applications that use these software interfaces. For more information about DirectMusic and the Windows Multimedia MIDI functions, see the Microsoft Windows SDK documentation.ĭirectMusic and the Windows Multimedia MIDI functions are clients of the SysAudio system driver, which builds the audio filter graphs that process the MIDI and DirectMusic streams. However, by emulating the behavior of older software and hardware, the midiOut Xxx and midiIn Xxx functions sacrifice the precision timing and enhanced functionality that are now available through the DirectMusic API. Beginning with Windows 98, the WDMAud system driver translates calls to these functions into commands to WDM audio drivers. The behavior of the midiOut Xxx and midiIn Xxx functions is based on the capabilities of legacy MIDI drivers and devices. Microsoft Windows Multimedia midiOut Xxx and midiIn Xxx functions Application programs rely on a combination of user- and kernel-mode components to capture and play back MIDI and DirectMusic streams.Īn application can use either of the following software interfaces for MIDI playback and capture:
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