21 Nov
2008
21 Nov
'08
8:22 a.m.
Dominic Sacré a écrit :
On Thursday 20 November 2008 23:49:46 Philippe Hezaine
wrote:
Recording to a new track in the same Rosegarden session is actually a very
good idea, I didn't think of that... You wouldn't lose anything that way.
As for the transformation, something like this should do the trick (not
thoroughly tested):
from mididings import *
class Volume2Velocity:
def __init__(self):
self.vol = {}
def __call__(self, ev):
if ev.type_ == CTRL and ev.param == 7:
self.vol[ev.channel] = ev.value
return None
elif ev.type_ == NOTEON and ev.channel in self.vol:
ev.velocity = self.vol[ev.channel]
return ev
run(Call(Volume2Velocity()))
Yes, but then you need to do the transformation one track at a time. If you
play multiple tracks through the same MIDI port on the same channel, some
notes will get the wrong velocity (unless every note event is immediately
preceded by a volume change).
Cheers,
Dominic
Thanks too much for your time and your information.
Bingo! I think it's the first time we get from a Lilypond file a midi
file with velocities values. But for all you're right. Note that I
cannot get a clean file with a loop in the same Rosegarden's session. I
have freezes and even crashes. Hence i output the midi from Rg through
mididings -> recording in Muse.
The raw outcome is in attach.
1) You could see a little latency in the attacks.
2) I lose the Lilypond header
3) Strangely i can't open the new file with the drum editor in
Rosegarden though it is on channel 10. (meta information?)
Anyway, thanks so much.
Have fun.
--
Phil.
Superbonus-Project (Site principal) <http://superbonus.project.free.fr>
Superbonus-Project (Plate-forme d'échange):
<http://philippe.hezaine.free.fr>
I'm
not sure mididings is the right tool for the job. The Python code
to transform the events would be quite simple, but mididings doesn't
support reading/writing MIDI files (yet?). You could of course use a
separate MIDI player/recorder, and route the events through mididings,
but you'd lose all meta information (tempo, time signature, etc.) from
the original file.
Yes. I was sucessfull to loop a midi file with Jack and
Rosegarden. The
outputs was routed through mididings and went back to Rg for a new
record on a new track. But it was not for this purpose and i didn't look
for the meta information.
But for now, if i have a copy about these informations may be i can try
again this experience? It isn't a piece of music, only a succession of
drums patterns. I can organize them to avoid different time signature... As far as
I can see, all tracks in your MIDI file are on the same
channel, so CC #7 messages on one track will affect the other tracks as
well. You should probably assign a different channel to each track.
No. Like i
have said these are drums patterns written by Lilypond. After
the famous transformation i could join all the tracks in one if i want.