## MMPM/2 Device Driver Reference

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### AUDIO_BUFFER (43h) - Description

This IOCtl is not required for MMPM/2. It is part of the AudioDD specification and is provided for reference.

This IOCtl is used to determine the amount of data currently queued, device driver internal queue sizes, and whether an overrun or underrun has occurred. If either state has occurred, its respective bit is turned on in the ulFlags field.