Thanks Peter!!!
This was just the information I was looking for!
John Patten
Date: Thu, 22 Apr 2010 23:39:17 -0800 (PST)
From: Peter Alcibiades <palcibiades-fi...@yahoo.co.uk>
Subject: Re: Record Audio in Rev on Linux OS?
To: use-revolution@lists.runrev.com
Message-ID: <1272008357927-2032844.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Invoking the shell command is the easy part. First, you open a
terminal and
verify that the command or script you want to use works properly from
the
terminal. For example, if you are going to use krecord you would open a
terminal and do
krec
followed by whatever options you want.
(this seems to be the command which opens the app now, seems to me it
used
to be krecord but still.....)
Now you know that it works as expected in the shell, you can invoke it
from
Rev:
put shell("krec") -- this will just open the application.
For instance, to execute the command you gave as a sample, from a
button,
you would just do:
on mouseUp
put shell("arecord -d 10 -f cd -t wav -D copy foobar.wav")
end mouseUp
This would then record the file in the user's home directory as
foobar.wav.
You can execute any shell command like this.
You can also pipe the output of one shell command to the input of
another
one, in a shell command, as in
ls | gedit
this will have the effect of first listing the current directory
contents,
then sending the result to gedit, in which the input will be opened.
You
could use this to send a file, once recorded, to a player. Or, if you
have
lame installed, you could use it to convert the file to mp3 with
soundconverter.
Finally, you might need to execute commands one after the other, which
you
can also do. To do this, you put your script into a file, for example,
myscript.sh, have the first line be a so called 'shebang', make it
executable, and put in your commands one after the other. Lets say you
wanted the file in the above example to go to the desktop:
#! /usr/bin/env bash
cd Desktop
arecord -d 10 -f cd -t wav -D copy foobar.wav
Now you would do, from your button,
put shell (myscript.sh) -- the file would have to be made
executable.
The shell is a quite fully featured, if rather antique, programming
language, with what you might regard as a huge collection of macros and
utilities for all kinds of purposes. Most of the stuff you would
expect,
flow control, branching, error reporting etc. There are lots of
guides to
it on the net, but if you're in an academic environment the simplest
might
be to find someone in IT who has scripting experience and have them
write
it. If you want to learn it yourself, there is a nice book, full of
worked
examples, by Glen Smith: Introduction to Shell Scripting. Might be a
bit
basic for an experienced programmer.
It is antique, but its ideal for this sort of thing, because of the
ability
to invoke stuff like krec. On Rev, because of the limitations of Rev on
Linux at the moment, its a lifesaver.
Peter
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