What you are looking for is Audio::DSP. You must have your mixer settings setup right to receive input from the mic,

#!/usr/bin/perl
use Audio::DSP;

#alsamixer must be setup right, just turn everything up :-)

$|++;

($buf, $chan, $fmt, $rate) = (4096, 1, 16, 22050);
#($buf, $chan, $fmt, $rate) = (4096, 1, AFMT_U16_LE, 44100);
#use the formats from soundcard.h, plain 16 wont work with sblive

$dsp = new Audio::DSP(buffer   => $buf,
                     channels => $chan,
                     format   => $fmt,
                     rate     => $rate);

$dsp->init() || die $dsp->errstr();

# this buffers print to file so that you need  ~ 10 secs of audio or t
+he file is 0 
# like when you hit control-c after a couple of seconds
# open(OUT, "| speexenc -n --rate 22050  -  test.spx "); 

##this works for small low Q ogg
open(OUT, "| oggenc -r -R 8000 -B 8 -C 1 -q 0 - | cat >  zztest.ogg ")
+ 
                 or warn "No oggenc $!\n";
         
while ( $buffer = $dsp->dread(4096) )  {

    syswrite( OUT, $buffer, length($buffer) );

}

$dsp->close();

# If you don't set the output of the dsp with arecord, or this
# module, the dsp will go to it's lowest setting
#   speexenc --rate 8000 --le --8bit  /dev/dsp - | cat > 1.spx
# it works but it sounds lousy.

#  to convert to wave
#  sox -r 44100 -u -w -c 1 out1.raw out1.wav
# arecord -f S16_LE -c1 -r 22050 -t wav -d 3600 -D hw:0,0 
#      | speexenc -n --rate 22.05  - - > /home/zentara/`date +%d%b%y%H
+%M%S`.spx
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