Allocating and Preparing Audio Data Blocks - Win32 Multimedia Programmer's Reference (mmedia.hlp)

Allocating and Preparing Audio Data Blocks

Some multimedia audio functions require applications to allocate data blocks to pass to the device drivers for playback or recording purposes. Each of these functions uses a structure (or header) to describe its data block. The following table identifies these functions and their associated header structures. (The MMSYSTEM.H file defines the data structures for these headers.)

Function	Header structure	Purpose
waveOutWrite	WAVEHDR	Waveform playback
waveInAddBuffer	WAVEHDR	Waveform recording
midiOutLongMsg	MIDIHDR	MIDI system-exclusive playback
midiInAddBuffer	MIDIHDR	MIDI system-exclusive recording

Before you use one of the functions listed above to pass a data block to a device driver, you must allocate memory for the data block according to the guidelines discussed in the following topics.

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