About the Audio DDK

This chapter includes:

What you'll find in this guide

The following table may help you find information quickly:

If you want to: Go to:
Estimate how much time it will take to develop an audio driver for your card Evaluating Your Card
Understand how the audio driver fits into the QNX architecture Organization of a driver
Write an analog mixer Handling Analog Audio Data
Use a standard mixer DLL Handling Analog Audio Data
Code a Pulse Code Modulation (PCM) device Handling PCM Audio Data
Get details about the API functions API Reference
Read about the codecs supported by QNX Supported Codecs
Explore the code of a sample mixer Sample Mixer Source
Understand the terms used in this guide Glossary

For information about other audio drivers, see the entries for the deva-* audio drivers in the QNX Utilities Reference.

Supported features

Currently supported features include:


This DDK doesn't support:

  • MIDI
  • 3D audio
  • game ports


To use this guide, you need to have:

You might also need to refer to the QNX Audio Developer's Guide.

Building DDKs

You can compile the DDK from the IDE or the command line.

Typographical conventions

Throughout this manual, we use certain typographical conventions to distinguish technical terms. In general, the conventions we use conform to those found in IEEE POSIX publications. The following table summarizes our conventions:

Reference Example
Code examples if( stream == NULL )
Command options -lR
Commands make
Environment variables PATH
File and pathnames /dev/null
Function names exit()
Keyboard chords Ctrl-Alt-Delete
Keyboard input something you type
Keyboard keys Enter
Program output login:
Programming constants NULL
Programming data types unsigned short
Programming literals 0xFF, "message string"
Variable names stdin
User-interface components Cancel

We use an arrow (→) in directions for accessing menu items, like this:

You'll find the Other... menu item under Perspective-->Show View.

We use notes, cautions, and warnings to highlight important messages:

Note: Notes point out something important or useful.

Caution: Cautions tell you about commands or procedures that may have unwanted or undesirable side effects.

WARNING: Warnings tell you about commands or procedures that could be dangerous to your files, your hardware, or even yourself.

Note to Windows users

In our documentation, we use a forward slash (/) as a delimiter in all pathnames, including those pointing to Windows files.

We also generally follow POSIX/UNIX filesystem conventions.

Technical support

To obtain technical support for any QNX product, visit the Support area on our website (www.qnx.com). You'll find a wide range of support options, including community forums.

Copyright © 2001–2018, QNX Software Systems Limited, a subsidiary of BlackBerry Limited. All rights reserved.