## MMPM/2 Device Driver Reference

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### AUDIO_UPDATE (47h) - Description

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

This IOCtl has two purposes:

To condense the array of buffers by removing all buffers that have been processed from the array of buffers in the MCI_AUDIO_IOBUFFER data structure.

To add a buffer to the list. The address and length of the buffer is passed down to the device driver in the audio_update structure.