About This Guide

The Audio Developer's Guide is intended for developers who wish to write audio applications using the QNX Sound Architecture (QSA) drivers and library.

This table may help you find what you need in this guide:

To find out about:	Go to:
The structure of an audio application	Audio Architecture
Playing and recording sound	Playing and Capturing Audio Data
The structure of a mixer	Mixer Architecture
Some tips for reducing audio latency	Optimizing Audio
Audio library functions	Audio Library
How to code a .wav player in C	wave.c example
How to code a .wav recorder in C	waverec.c example
How to code a mix_ctl in C	mix_ctl.c example
Why libasound.a isn't offered	ALSA and libasound.so
Changes made in each release	What's New in This Release?
Terms used in this guide	Glossary

Note: You should have already installed QNX Neutrino and become familiar with its architecture. For a detailed overview, see the System Architecture guide.

The key components of the QNX Audio driver architecture include:

io-audio: Audio system manager.
deva-ctrl-*.so drivers: Audio drivers. For example, the audio driver for the Ensoniq Audio PCI cards is deva-ctrl-audiopci.so. For more information, see the entries for the deva-* audio drivers in the QNX Neutrino Utilities Reference.
libasound.so: Programmer interface library.
<asound.h>, <asoundlib.h>: Header files in /usr/include/sys/.