## MMPM/2 Device Driver Reference

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### AUDIO_BUFFER (43h) - Determine Buffer Status

Category:
AUDIO_IOCTL_CAT (80h)
Function:
AUDIO_BUFFER (43h)
Description:
Determine Buffer Status

Select an item:

    Description
    Parameter Packet Format
    Data Packet Format
    Returns
    Remarks

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.