>A solution could be alter libasound to support non-kernel drivers. Or use
>a loopback device in the kernel.
libasound *does* support non-kernel drivers. when you access
snd_{pcm,rawmidi}_foo (handle, ...)
what you're actually doing is:
1) check the device type of handle
2) use snd_pcm_TYPE_foo (handle, ...)
this is not done for every call - instead, when you open the handle,
the relevant function pointers are set up.
for example:
snd_pcm_open (&handle, "hw:0,0", ...)
sets up the set of function pointers to use:
snd_pcm_hw_read
snd_pcm_hw_write
snd_pcm_hw_prepare
snd_pcm_hw_status
etc.
you can define a new device type in ~/.asoundrc that names specific
functions to be used for each part of the API. then you just add the
.so that contains the functions, and you're all set.
--p
