[alsa-devel] [PATCH 0/5] ALSA: firewire-tascam: add MIDI functionality

[Stefan Richter]

On Oct 13 Jonathan Woithe wrote:
> for cases like MOTU, where mixer control setting updates
> are pushed to the computer by the device in response to front panel actions,
> there will be a need for userspace to somehow tap into this flow.  Userspace
> could not gain access to the iso stream because the kernel will have control
> over that.  Or can userspace tap into iso streams that have been initiated
> by the kernel (that is surprising to me if it's true).

Indeed we do not have support for multiple local listeners on the same
stream.  (firewire-core supports multiple listeners for FCP reception, but
this is a simpler case in several respects.)

I guess getting MOTU status out to userspace could work by having the
audio driver extract the data from the stream and push it as a new type of
event of the <sound/firewire.h> API through the ALSA hwdep interface.

(Apologies for going somewhat offtopic.)
-- 
Stefan Richter
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