[ANNOUNCE] USB MIDI support for ALSA

[ANNOUNCE] USB MIDI support for ALSA

[Clemens Ladisch]

Hi,

I've written a daemon which connects the ALSA sequencer with the
usbdevfs device file of a USB MIDI device. You can get it at
<http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.

It requires a kernel with USB and usbdevfs support (obviously), and
with hotplugging support and hotplugging scripts installed correctly.

It should work with most USB MIDI devices, but currently it has been
tested with Roland SC-8820 only. I don't have the slightest idea
whether the code for parsing the device descriptors of fully compliant
devices works at all. :-) So, please tell me if it works for you.


Clemens

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Re: [ANNOUNCE] USB MIDI support for ALSA

[Takashi Iwai]

At Mon, 13 May 2002 21:21:56 +0200,
Clemens Ladisch wrote:
> 
> Hi,
> 
> I've written a daemon which connects the ALSA sequencer with the
> usbdevfs device file of a USB MIDI device. You can get it at
> <http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.
> 
> It requires a kernel with USB and usbdevfs support (obviously), and
> with hotplugging support and hotplugging scripts installed correctly.

great!

it's a very clean solution.  definitely the right way for usb midi,
rather than writing a driver module for each.


Takashi

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Re: [ANNOUNCE] USB MIDI support for ALSA

[Frank Barknecht]

hi,
Takashi Iwai hat gesagt: // Takashi Iwai wrote:
> > I've written a daemon which connects the ALSA sequencer with the
> > usbdevfs device file of a USB MIDI device. You can get it at
> > <http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.
> it's a very clean solution.  definitely the right way for usb midi,
> rather than writing a driver module for each.
Would a daemon to connect alsa to usb devices be the way for USB-audio
as well?

ciao,
-- 
 Frank Barknecht                                  _ _______footils__


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Re: [ANNOUNCE] USB MIDI support for ALSA

[Paul Davis]

>> I've written a daemon which connects the ALSA sequencer with the
>> usbdevfs device file of a USB MIDI device. You can get it at
>> <http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.
>> 
>> It requires a kernel with USB and usbdevfs support (obviously), and
>> with hotplugging support and hotplugging scripts installed correctly.
>
>great!
>
>it's a very clean solution.  definitely the right way for usb midi,
>rather than writing a driver module for each.

it is? isn't the right way to redirect into USB-aware code within
alsa-lib? going through a daemon seems totally wrong to me ...

--p

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Re: [ANNOUNCE] USB MIDI support for ALSA

[Takashi Iwai]

At Tue, 14 May 2002 09:08:29 -0400,
Paul Davis wrote:
> 
> >> I've written a daemon which connects the ALSA sequencer with the
> >> usbdevfs device file of a USB MIDI device. You can get it at
> >> <http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.
> >> 
> >> It requires a kernel with USB and usbdevfs support (obviously), and
> >> with hotplugging support and hotplugging scripts installed correctly.
> >
> >great!
> >
> >it's a very clean solution.  definitely the right way for usb midi,
> >rather than writing a driver module for each.
> 
> it is? isn't the right way to redirect into USB-aware code within
> alsa-lib? going through a daemon seems totally wrong to me ...

i agree that the library-plugin would be fine and effective, but it's
only if a single application shares the device.  then the device
end-point is directly bound to the application.

however, when two applications access to the device (or when arbitrary
connection is allowed), then the situation would be complicated.
there must be an end-point mixer before the device output.
i think the daemon is the easiest way to be implemented on behalf of
kernel driver.


Takashi

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Re: [ANNOUNCE] USB MIDI support for ALSA

[Patrick Shirkey]

I'm starting to wonder if it isn't better to write native ALSA support into the usb audio driver. Currently it does this with OSS so why not just add ALSA to it and be done with it?

Surely that is the easiest approach. The only reason I see against it is latency requirements are better served by having ALSA connect to usb instead of usb connect to ALSA. 

--
Patrick Shirkey - Boost Hardware Ltd
For the discerning hardware connoisseur
Http://www.boosthardware.com
Http://www.boosthardware.com/LAU/guide/


--- Takashi Iwai <tiwai@suse.de> wrote:
>At Tue, 14 May 2002 09:08:29 -0400,
>Paul Davis wrote:
>> 
>> >> I've written a daemon which connects the ALSA sequencer with the
>> >> usbdevfs device file of a USB MIDI device. You can get it at
>> >> <http://www.informatik.uni-halle.de/~ladischc/usbmidid.html>.
>> >> 
>> >> It requires a kernel with USB and usbdevfs support (obviously), and
>> >> with hotplugging support and hotplugging scripts installed correctly.
>> >
>> >great!
>> >
>> >it's a very clean solution.  definitely the right way for usb midi,
>> >rather than writing a driver module for each.
>> 
>> it is? isn't the right way to redirect into USB-aware code within
>> alsa-lib? going through a daemon seems totally wrong to me ...
>
>i agree that the library-plugin would be fine and effective, but it's
>only if a single application shares the device.  then the device
>end-point is directly bound to the application.
>
>however, when two applications access to the device (or when arbitrary
>connection is allowed), then the situation would be complicated.
>there must be an end-point mixer before the device output.
>i think the daemon is the easiest way to be implemented on behalf of
>kernel driver.
>
>
>Takashi
>
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