Re: [LAU] [LAA] [ANN] jack-keyboard 2.5

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To: Nedko Arnaudov <nedko@...>, <linux-audio-user@...>
Date: Wednesday, May 21, 2008 - 10:06 am

On Tuesday 20 May 2008, Nedko Arnaudov wrote:

Maybe i missed something. Here's how i view things:

Yes, i have an app, let's call it jack-keyboard which can only talk to jackd.
Ok, the user wants to send MIDI from jack-keyboard to the hardware MIDI
interface on the computer which is connected to a hardware synthesizer..

Ok, so the user hooks up the jackd MIDI output port of jack-keyboard to the
respective jackd MIDI input port of the jackd MIDI -> ALSA MIDI bridge.

Let's further assume that the periodsize of jackd is large (> 100ms).. The
user presses a key and jack-keyboard writes the MIDI event (timestamped i
suppose) into its buffer. Then jackd will, at some point in the future,
decide to run a cycle. The event will propagate to the jackd MIDI - ALSA MIDI
bridge. The event is timestamped, so the ALSA MIDI bridge when it has put
emphasis on providing jitter free experience, will wait just a little more
with sending out the event to the hw interface.

Finally the event is sent out. How is >100ms "no extra delay"? Or does jackd
also offer a way to "short circuit" the process cycles for events that are
sent from an app directly to a hw interface?


Palimm Palimm!
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