[PD] hid object and latency
mailinglists at thefighting.org
Mon Oct 8 02:30:58 CEST 2007
First off, I'm new to pd but it seems to be a fantastic environment.
Big thanks to everyone who's worked on it.
I've run into a problem. I built a pd patch to translate joystick
button inputs into MIDI note signals using hid and noteout. Indeed
it functions correctly, and there are no logic errors that I can find
as far as which button triggers which note. However there is
noticeable latency, too much to use to play an instrument in realtime.
Using a MIDI keyboard to send the same notes (bypassing pd), I
encounter no latency that I am able to discern easily. I believe the
latency must be related to pd, either in my patch or in the hid
object, or in my joystick's USB interface (a playstation to USB
converter). Is this a known issue in pd or hid, or has anyone
encountered this before?
If it helps, I am running on a G4 Macintosh, using pd .38.4 extended,
and using the IAC Driver to get MIDI data between programs. I have
hid polling at 1ms intervals, and am using the Ableton Live demo as
my destination (triggering the Impulse plugin).
I am almost totally convinced that the latency is in the USB
interface, and therefore there is nothing I can do, but I figured it
was worth asking. I spent a while going through the list archives,
Google, and the documentation but did not find anything.
Thanks in advance!
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