For my midi-only patches, I use the -r flag to reduce the latency. For example, -r 192000 gives me 1.333-1.666ms of latency (using jack with a buffer of 128). However having a startup flag that do the "fast-as-possible" thing, would be even better :-)
Nicola
Il 27/11/2012 18:55, Cyrille Henry ha scritto:
cool, thanks. better than a ifdef, a startup flag!
cheers c
Le 27/11/2012 18:50, Miller Puckette a écrit :
I believe if you edit s_midi.c and change:
if (midi_outqueue[midi_outtail].q_time <= midirealtime)to
if (1)and
if (midi_inqueue[midi_intail].q_time <= logicaltime)also to
if (1)that will make it fast-as-possible. The queueing code should probably be surrounded by an ifdef to make this easier (perhaps someday...)
cheers M
On Tue, Nov 27, 2012 at 06:23:15PM +0100, Cyrille Henry wrote:
Is there a way to bypass all of this? my pd usage usually imply sending and receiving as fast as possible. sending delay usually annoy me. cheers c
Le 27/11/2012 18:06, Miller Puckette a écrit :
Pd tries to time-stamp MIDI on input and tries to delay sending MIDI output until the correct time; but Pd's accuracy in doing this is limited by the fact that it can't input or output MIID while it is either sleeping or running (only when the scheduler polls for what-to-do-next after either a task or a sleep has finished.)
It would be more accurate for Pd to rely on either software interrupts or even better on some underlying OS time-tagging mechanism (for instance by exploiting whatever portmidi does). But I have to admit I've never treated this as a high priority (which one might take as an implied value judgement about MIDI).
cheers Miller
On Tue, Nov 27, 2012 at 11:44:06AM +0100, Cyrille Henry wrote:
Le 27/11/2012 10:36, IOhannes m zmoelnig a écrit : ...
with MIDI, Pd doesn't do any buffering and no synchronisation to some external clock is done, so messages appear in bursts which you notice as a inaccurate timing.
There is 1 strange thing however : pd did some kind of buffering with midi, in order to synchronise with audio out. if you configure 100ms audio latency, then a midi loop will be between 100 and 105ms. with 10ms audio buffer out, the midi loop is between 10 and 15ms. but this buffer should not change anything on timing except adding latency. cheers c
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