How do create a dummy device for recording audio? Does it exist already?

[Caleb Crome <alsa@crome.org>]

Hello,
      I've looked through the archives and I couldn't find what I'm 
looking for, so here goes:

I'd like to create a dummy audio device that can record the PCM data 
written to it into a file.  So, the dummy device would appear as a sound 
card to the audio program (Real Player for example), and start dumping 
audio into a file, or maybe it would create another device that could be 
read simply by 'dd' or some custom command.  Then I'd pipe the data into 
an MP3 or OGG encoder, split into 1/2 hour chunks, or whatever length 
chunks I like.

Once the system is running, I'd do something like this:

1) Open my Player, tune to my favorite station. Use my new device for 
audio output.
2) do something like:  dd if=/dev/audiocapturepcmout count=xxx | lame 
--output myfile.mp3

What would it take to make a alsa drive that captures the PCM data into 
a file?
How about one that captures it, then pumps it into a new /dev/ device 
for reading?

Thanks,
  -Caleb



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