Re: [ANNOUNCE] USB MIDI support for ALSA

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. 

--
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--- 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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Re: [linux-usb-devel] Re: [ANNOUNCE] USB MIDI support for ALSA

[Greg KH]

On Tue, May 14, 2002 at 08:11:04PM -0700, Patrick Shirkey wrote:
> 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. 

Sure, feel free to do it, patches will be gladly accepted :)

thanks,

greg k-h

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