Preparing Audio Data Blocks

Before you pass an audio data block to a device driver, you must prepare the data block by passing it to a header-preparation function. When the device driver is finished with the data block and returns it, you must clean up this preparation by passing the data block to a header clean-up function before any allocated memory can be freed.

Windows provides the following functions for preparing and cleaning up audio data blocks.

Function	Description
midiInPrepareHeader	Prepares a MIDI-input data block.
midiInUnprepareHeader	Cleans up the preparation on a MIDI-input data block.
midiOutPrepareHeader	Prepares a MIDI-output data block.
midiOutUnprepareHeader	Cleans up the preparation on a MIDI-output data block.
waveInPrepareHeader	Prepares a waveform-input data block.
waveInUnprepareHeader	Cleans up the preparation on a waveform-input data block.
waveOutPrepareHeader	Prepares a waveform-output data block.
waveOutUnprepareHeader	Cleans up the preparation on a waveform-output data block.

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