Message-ID: <8D53104ECD0CD211AF4000A0C9D60AE356734A@probe-2.acclaim-euro.net>
From: Shawn Hargreaves <ShawnH AT Probe DOT co DOT uk>
To: djgpp AT delorie DOT com
Subject: Re: Fast reading of multiple keypresses in Allegro 
Date: Fri, 19 Feb 1999 15:53:40 -0000
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Reply-To: djgpp AT delorie DOT com

Andrew Davidson writes:
> I think I'm approaching this problem from the wrong angle. Rather 
> than play a sample through allegro's functions is there any way I 
> can simply flex or relax the speakers a single time?

The SB does have a non-DMA mode where you can just write sample
values to the DAC whenever you feel like it, but I don't think
this will really do what you want (so what exactly do you want,
anyway? It would be useful if you could describe your goal in
a bit more detail :-) Modern soundcards are designed for playing
streams of sample data at a constant rate, and I think you will
have a lot of trouble coaxing them to emulate those old speaker
effects.

From what you said about playing a noise effect, why not just
generate a sample which contains this sound and then trigger it
at the appropriate times? If you want continual white noise, a
second or so of looping sample will do this very nicely.

If you want to generate a waveform on the fly, you can use the
Allegro audio streaming functions, as demonstrated in ex28.c.


	Shawn Hargreaves.