From: Kai Dietrich <toepferei DOT dietrich AT t-online DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: replace uclock
Date: Sun, 17 Dec 2000 18:49:53 +0100
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi!

> > question: Is there any replacment for uclock which
> > works also with MIDAS?
>
> Can you tell what causes uclock to stop working with MIDAS?  Perhaps some
> workarounds could be suggested.

I didn't wrote the library so I don't know why it doesn't work. I only know
that it produces some strange frame rates if I call MIDASinit(); . I found
something in the MIDAS help but I don't know if it is an answer:

"To be able to play music in the background in MS-DOS, and to keep proper
tempo with all sound cards, MIDAS needs to use the system timer (IRQ 0,
interrupt 8) for music playback. Because of this, user programs may not
access the timer directly, as this would cause conflicts with MIDAS music
playback. As the system timer is often used for controlling program speed,
and running some tasks in the background, MIDAS provides a separate user
timer callback for these purposes. This callback should used instead of
accessing the timer hardware directly."

> As for replacements, please tell what accuracy do you need for time
> measurements, and approximately how do you mean to call such a function.
> It is next to impossible to give a good advice without knowing these
> details.

I need an accuracy of  about 1-5 ms. The function should be a simple function
and should return a time value (like uclock). A working timer callback would
be ok, too. I played around with MIDAS MSDOS timer callbacks and it worked,
but if the callback rate is to low (<20576 or something like this), sound
does some kind of grumbling (framerate is still correct) (callback function
is only FrameCounter++;)


Bye
           Kai