How to record sound

What should i do record a sound from microphone on mini6410? Is there a
simple console application for Linux for sound recording?

I was asking myself the same question a while ago, and here is what I
ultimately came up with. I'll throw it on here for future reference:

To get the sound working you should probably put ALSA on the unit. The
stock unit looks like it has ALSA on it, but somehow I couldn't get any
audio to work (maybe it is just the minimum install to run QTopia?!?!?).
Anyhow here is how I did it:

Cross compile ALSA-LIB and ALSA-UTIL on your Linux box. Use version 1.18:


MAKE ALSA-LIB: 
==============

CC=arm-linux-gcc ./configure --target=arm-linux --host=i686-pc-linux-gnu
--prefix=/usr

make install /buildroot/


MAKE ALSA-UTIL:
===============

apt-get install xmlto
apt-get install gettext

CC=arm-linux-gcc ./configure --target=arm-linux --host=i686-pc-linux-gnu
--prefix=/usr --with-alsa-inc-prefix=/buildroot/usr/include
--with-alsa-prefix=/buildroot/usr/lib --disable-alsamixer

make install DESTDIR=/buildroot/


LOAD TO TARGET:
===============

cd /buildroot
tar czf myalsa.tar usr
ftp 192.168.2.222        <=== or whatever your units IP is
(logon)
send myalsa.tar
exit
telnet 192.168.2.222
(logon)
cd /
tar xzvf myalsa.tar -C/


CONFIGURE DEVICE
================

add the following to the /etc/init.d/rcS 

mkdir /dev/snd/
cd /dev/snd
ln -s /dev/controlC0 controlC0
ln -s /dev/pcmC0D0c pcmC0D0c
ln -s /dev/pcmC0D0p pcmC0D0p

...then reboot

TEST
====
speaker-test -W /usr/share/sounds/alsa/ -w Front_Center.wav -twav

if you hear the sound in your speakers, then ALSA is working correctly. You
can also use the arecord and aplay utilities. And most importantly you can
write your own software now to use the ALSA API.

One other important thing regarding the recording: You can use the program
"amixer" to control various sound options, the one important to know is
"Input Mux" which has four options:
- Differential
- Analog1
- Analog2
- Both

Analog1 is the Mic that you plug-in above the USB-B connector.
Analog2 is the on-board Mic
for the other ones, look at the codec chip data sheet for details.

Hope this could help. What I haven't found out yet is how to set the above
parameter to a default. amixer -store didn't do it for me. When the system
boots, it seems to default to "Differential". When I open the default input
device, the setting changes to "Analog2". How can I make it default to and
stay at Analog1 ???

Thanx. I've already succedded in recording sound by  "arecord" tool :)

what is arecord tool and how to use it ?

arecord is one of the ALSA tools.
Example of usage: arecord -t wav  something.wav

can you tell me some details about  ""amixer" to control various sound
options, the one important to know is
"Input Mux" which has four options:
- Differential
- Analog1
- Analog2
- Both "

how to write commands.....

I did

I rum the Spectrum (qt demo) in Mini2440 but bytesRead from QIOdevice = 0
please help me

when i configure the alsa-lib it gives me the following error : 

checking for C compiler default output file name... configure: error: C
compiler cannot create executables
See `config.log' for more details.

any help please .

when i 
  make install /buildroot/
  it gives me the following error 

  make: *** No rule to make target `install'.  Stop.
  
  how can i fix it ?

Hi Micha,

I just followed your steps for configuring alsa-utils.

Once after the build, I have copied all the files from DESTDIR to rootfs
but on target I found below issues.

mini2440> aplay
-/bin/sh: aplay: not found
mini2440> speaker-test 
-/bin/sh: speaker-test: not found

Could you please tell me, does alsa require any more libs other than built
onces...

Thanks,
Jagan.

mini2440> aplay
-/bin/sh: aplay: not found
mini2440> speaker-test 
-/bin/sh: speaker-test: not found




---u r  cross compiler s  are   different   from  mini2440..please   reset 
cross compiler  from  friendly arm.net

# speaker-test -W /usr/share/sounds/alsa/ -w Front_Center.wav -twav

speaker-test 1.0.24.2

Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
WAV file(s)
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
Playback open error: -19,No such device