On Wed, 1 May 2002, Paul Davis wrote:
> >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.
This looks nice. Do rawmidi ports created this way appear as sequencer
clients as well?
--
Manush
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