5 Nov
2020
5 Nov
'20
3:21 a.m.
from the jack(1)d man page:
-M, --midi-bufsize [ event-count ]
Specify the size of the buffer used for MIDI ports. Units are
"MIDI events per process() cycle", where an event occupies up to 4 bytes
(as most common MIDI events do). The default buffer size is 2048 bytes,
which is
about 500 MIDI events. Typical values for event-count will
range from 10 to about 1000. Be aware that using very high values along
with a large number of ports may cause JACK to fail to start because of
the amount
of memory that would be required.
On Tue, Nov 3, 2020 at 10:57 AM Len Ovens <len(a)ovenwerks.net> wrote:
On Tue, 3 Nov 2020, Christopher Arndt wrote:
I made some tests and it seems that there is
indeed a limit of 112 bytes
for outgoing sysex data.
I knew there was a limit but had never run into it. I realize that the
longest sysex I had used were ~20 bytes (mackie control with LCD info sent
channel at a time)
The one question I do have is the buffer size (128/2 ?) and if you tested
at more than one buffer size. I would expect that the two would be tied
together. I also remember reading that there had been code developed for
jack (I do not remember if it was jack 1 or 2 specific) to allow long,
non-realtime sysex to be used. However, I do not remember if it was ever
included or how it was accessed.
--
Len Ovens
www.ovenwerks.net
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