LinuxQuestions.org - how to playback/convert raw sound with sox captured with alsa 'write file'

I've been changing the command line options with sox to convert captured raw sound to wav. Sox is great; i'm trying to learn the basics.

I capture the sound using an altered .asoundrc

Code:

pcm.V8237 { type hw; card V8237; }

ctl.V8237 { type hw; card V8237; }

pcm.!default pcm.V8237

ctl.!default ctl.V8237

pcm.!default {

    type plug

    slave {

        pcm rate48000Hz # Direct default output to the below converter

    }

 }

 pcm.rate48000Hz {

    type rate

    slave {

        pcm writeFile # Direct to the plugin which will write to a file

        format S16_LE

    #    channels 2

        rate 48000

    }

    #route_policy copy

 }

 pcm.writeFile {

    type file

    slave {

        pcm card0 # Now write to the actual sound card

    }

    file "aplay-D_card0-t_raw-f_S16_LE-r48000-c_2.raw"

 }

 pcm.card0 {

    type hw

    card 0

 }

 ctl.card0 {

    type hw

    card 0

 }

To convert:

Code:

sox -r 48k -s -b 16 -c 2 aplay-D_card0-t_raw-f_S16_LE-r48000-c_2.raw foo.wav

The r is the rate, -s is signed integer, -b is 16 bit, and -c 2 is for two channels.

I got the .asoundrc mostly from http://www.swview.org/node/213
Also helpful were the Alsa wiki pages: http://www.alsa-project.org/alsa-doc...m_plugins_file

including a script to generate a .asoundrc file:
http://alsa.opensrc.org/index.php/.a....asoundrc_file

A question----
Doesn't alsa (.asoundrc) support wav format? When I tried entering 'format wav' in the asoundrc, I received an error message.

A comment--
This is a rather round about way of doing things. The new audio is recorded in the current working directory most often ~ and the new data is neither appended to nor does it replace the old data; it becomes a sort of conglomeration. To record effectively it would be necessary to have a script to enable (put in place) and disable (remove) the .asoundrc file.