Want to hack a new feature into pcm/pcm_file.c

[Juan Carlos Castro y Castro <jcastro@instant.com.br>]

Hello. I'd like very much to be able to specify an existing raw audio 
file and have it be a "virtual microphone", i.e. recording applications 
using this PCM would get the sound that's stored in that file. That's 
the exact opposite of the "virtual speakers" thing the file plugin does now.

How hard would it be to do such a thing, and where should I begin 
studying? I am an experienced C programmer but know precious little 
about the ALSA architecture. If it's already possible to do the above 
with existing features, please don't beat me -- I asked around in 
alsa-user and got no answer, so I'm assuming hacking alsa-lib will be 
necessary.

Cheers,
Juan


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