On Thu, Dec 31, 2009 at 09:44:33PM +0100, Roland Smith wrote:
> On Thu, Dec 31, 2009 at 12:11:17PM -0800, Gary Kline wrote:
> >
> > Yeah, I views the file with od -c; but wouldn't it be much faster
> > to have the data file part of my test program than having to open,
> > read, cat thru /dev/dsp each time, close file? I stole the cat
> > from the K&R book, and by reading the click.h data file it seems
> > everything would go much faster.
>
> Just read them all once, at start-up and store them in a buffer. You could use
> mmap(2), but if the sound fragments are small, that might be a waste of memory
> becasue mmap maps at least a page.
Well, Lowell's thinking right be dead-on if this were just for my
own use, but considering that I found 3 unix-type click-drivers,
this "need," however limited, exists. Below are a few of the misc
noise files I've collected over the years. I'm not that famaliar
with mmap, but below are the click files I have so far. the Sun's
are a flat, Klick. It's a dull thud-like sound while the other
one, click.* are a nice, solid thunk. There is a trailing fuzz in
the after-echo. that hopefully I'll be able to edit out. Then it
will be the thunk with a brief after-echo. The Sun produces a
brief 0.1s BUMP, the click is this neat 0.2 thunk....
This is full-audio [koff-koff]; I'll play around with MP3 and see
if the resulting click.wave can be shortened. It occured to me
than this click might be too slow for a touch-typist who can do 80
or 120wpm. Or anyone who can do up to 40-60wpm. But then, you are
probably watching the screen, not the keyboard. Can easily see if
you've hit the key(s).
2 -rw-r--r-- 1 kline wheel 914 Sep 4 2005 Klick.au
2 -rw-r--r-- 1 kline wheel 1808 Dec 31 01:15 Klick.wav
2 -rw-r--r-- 1 kline wheel 1263 Sep 16 1997 click.au
2 -rw-r--r-- 1 kline wheel 1275 Sep 16 1997 click.wav
If I had thought of this use-prefab clicks back in 1999 rather than
the BEL, problem solving. ...Still, my disk crashed the following
morning, so it ---- well, whatever:_)
>
> I'll send you a utility function I've written to read files into memory
> off-list.
>
Super, thanks,
gary
> Roland
> --
> R.F.Smith http://www.xs4all.nl/~rsmith/
> [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
> pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
--
Gary Kline kl...@thought.org http://www.thought.org Public Service Unix
http://jottings.thought.org http://transfinite.thought.org
The 7.79a release of Jottings: http://jottings.thought.org/index.php
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