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05.06.2007 at 03:05PM PDT, ID: 22555692
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8.4

API and/or C code to generate warning tones through embedded audio chip

Asked by grant300 in Linux Programming, Slax / Slackware Linux

Tags: , , ,

I am using Slackware 9.1 in an embedded application.  The board is a Via Eden processor and chip set with an Via Audio Codec.  The board hardware behaves like a standard Pentium III machine and will boot Windows and Linux without dorking around.

My application is very simple: I need to generate a warning beep that repeats at a controllable frequency depending on the urgency of the situation.  Once per second to continuous.  Just a simple sine wave will do.  Nothing fancy.

The question is, what is the easiest way to accomplish that in C?  Should I use LADSPA, ALSA, OSS 4.0, or some other API?  What ever method I wind up with should put minimal load on the CPU since it is a quasi real-time environment.  I gather the way to do this is have the sign wave data hard-coded and "play" it at the sound card repeatedly.

Can someone pick an API and give me a high-level outline for what I need to code?

Thanks in advance.Start Free Trial
[+][-]05.06.2007 at 06:59PM PDT, ID: 19040654

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About this solution

Zones: Linux Programming, Slax / Slackware Linux
Tags: c, code, linux, generate
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Solution Provided By: slyong
Participating Experts: 1
Solution Grade: B
 
 
 
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