13 Apr
2003
13 Apr
'03
12:55 a.m.
Hi (hello Peter?)!
I have a couple of questions about fluidsynth. First I can't figure out how
to use the ladspa-stuff. I mean ladspa_add in specific. I tried it with a
simple plugin (diode from swh), but I couldn't get the input and outpuput
attached. I didn't know what to type for input and output. Unfortunately a
more detailed section on this is missing in the manpage.
Then is there a pause/forward/rewind feature for midi-files? It would be
really great if there was.
the click problem: I also had clicks at the end of the jeux d'orgues 2 font
and at the end of Rhodes73. It sounds like the release time is kept too short.
And one last thing: Everytime I start fluidsynth there is a quiet high
humming. It decreases when I turn of the reverb, but it doesn't completely go
away. Any idea?
I'm sorry for only wining. In general fluidsynth is ABSOLUTELY TERRIFIC!!! I
enjoyed it a great deal! Thanks Peter!
Kindest regards
Julien
Julien Patrick Claassen
jclaassen(a)gmx.de
julien(a)c-lab.de
http://www.geocities.com/jjs_home
SBS C-LAB
Fuerstenallee 11
33102 Paderborn
Phone: (+49) 5251 60 6060
Fax: (+49) 5251 60 6065
www.c-lab.de
13 Apr
13 Apr
2:42 a.m.
On Sun, 13 Apr 2003 04:45:11 +0200 (CEST), Julien Patrick Claassen wrote / a écrit:
the click problem: I also had clicks at the end of
the jeux d'orgues 2 font
and at the end of Rhodes73. It sounds like the release time is kept too short.
I have the same problem.
And more, I have lost bass drums notes, one of two times in a loop. I will dig deeper in
internet and in man pages.
It's the first time I really use this soft synth. Before I used timidity, but I
wasn't able to jackify it for real time midi recordings.
cheers
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12:56 p.m.
On Sun, 13 Apr 2003 08:28:59 +0400, Guy Clotilde wrote / a écrit:
I have the same problem.
And more, I have lost bass drums notes, one of two times in a loop. I will dig deeper in
internet and in man pages.
It's the first time I really use this soft synth. Before I used timidity, but I
wasn't able to jackify it for real time midi recordings.
responding to my own post :P I switched back to timidity, launched by root and with a
renice -19 it works allright. I haven't found a lot of docs and how-to about
fluidsynth-iiwusynth on the net. If anyone uses fluidsynth-iiwusynth with success for
real-time, I'll like to know the settings. Thans in advance.
Guy CLO~
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3:16 p.m.
Hallo,
Guy Clotilde hat gesagt: // Guy Clotilde wrote:
I haven't found a lot of docs and how-to about
fluidsynth-iiwusynth
on the net. If anyone uses fluidsynth-iiwusynth with success for
real-time, I'll like to know the settings.
There's nothing to set in fluidsynth: If fluid is running as root or
setuid root, it automatically uses realtime scheduling.
ciao
--
Frank Barknecht _ ______footils.org__
14 Apr
14 Apr
4:19 a.m.
On Sun, 13 Apr 2003 19:06:24 +0200, Frank Barknecht wrote / a écrit:
There's nothing to set in fluidsynth: If fluid is
running as root or
setuid root, it automatically uses realtime scheduling.
Hum yes I was afraid of it. No settings. But it doesn't work (lost notes) so I have to
use timidity which is reasonably good for what I need. I miss the ability to load fonts on
the fly and assign instruments. I will use swami to build my own soundfont.
Anyway, as I'm quite dumb about it, can you enlighten me about what it means
'setuid root'?
How exactly do I setuid root a prog (I have read about the 's' bit) ?
Can I setuid any program (er... is it dangerous) ?
Does any program 'setuid root' really run with roots provileges ?
Thanks in advance.
Guy CLO~
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5:44 a.m.
Hallo,
Guy Clotilde hat gesagt: // Guy Clotilde wrote:
Anyway, as I'm quite dumb about it, can you
enlighten me about what
it means 'setuid root'? How exactly do I setuid root a prog (I have
read about the 's' bit)?
Yes, you add the "s"etuid bit by channging the file mode with "chmod
u+s /usr/bin/program" and you get rid of it by "chmod u-s
/usr/bin/program"
Can I setuid any program (er... is it dangerous)?
It can be dangerous. Most audio software drops the root privileges
after they gained a higher scheduling, but the bigger the sofware, the
easier it is to make mistakes with this. It might be a good idea, to
only allow a certain group of users to run the setuid programs or use
something like "super" to control acess. Using a kernel feature called
capabilities also does reduces the need to "setuid root" larger
programs.
But then, setuid also is something ordinary on Linux. For example, the
/usr/bin/passwd programm is also "setuid root". It allows users to
change their own password and effectifly change a system file like
/etc/passwd. Without higher privileges they couldn't do this.
Does any program 'setuid root' really run with
roots provileges?
Effectivly yes, at least at the start. But as I said, most programs
stop being root on their own with something like the
setuid-C-function, see "man 2 setuid".
ciao
--
Frank Barknecht _ ______footils.org__
10:11 a.m.
On Mon, 14 Apr 2003 09:34:44 +0200, Frank Barknecht wrote / a écrit:
May I beg a last question: does it means that a setuid prog can delete important files? By
example, if I setuid root a file manager (xftree), will it be able to delete any files ?
Don't worry, I won't do it, just to understand.
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Hallo,
Guy Clotilde hat gesagt: // Guy Clotilde wrote:
Thanks for responding so quickly. I understand better this setuid thing.
Does any
program 'setuid root' really run with roots provileges?
Effectivly yes, at least at the start. But as I said, most programs
stop being root on their own with something like the
setuid-C-function, see "man 2 setuid".
10:28 a.m.
Hallo,
Guy Clotilde hat gesagt: // Guy Clotilde wrote:
May I beg a last question: does it means that a setuid
prog can
delete important files? By example, if I setuid root a file manager
(xftree), will it be able to delete any files ? Don't worry, I won't
do it, just to understand.
Yes, it will be able to delete any file. Setuid software bypasses the
user-id based authentification schemes in Linux. It should only be
used, where another solution is not possible (like in passwd or in
realtime scheduling).
ciao
--
Frank Barknecht _ ______footils.org__
13 Apr
13 Apr
5:19 p.m.
New subject: [linux-audio-user] fluidsynth: click problem fixed
On Sun, 2003-04-13 at 06:45, Julien Patrick Claassen wrote:
the click problem: I also had clicks at the end of
the jeux d'orgues 2 font
and at the end of Rhodes73. It sounds like the release time is kept too short.
I have fixed this problem (by a hack as yet) some hours ago, with
guidance from Markus Nentwig, one of the developers of fluidsynth.
I will hopefully work on getting the fix done properly (that is,
configurable via options), and on proposing it for the main source tree.
If you want to get rid of the problem NOW, get fluidsynth 1.0.1 (if you
don't have it already), and then do the following:
open fluid_voice.c, get to line 1367
after:
count = 1 + NUM_BUFFERS_RELEASE(x);
add:
if (count<98) count = 98;
and the clicks will be gone!
The value of 98 was taken from a temporary debug output while testing
Jeux d'Orgues 1, where the clicks did not happen. A lower value might
work.
--
Sincerely yours, Mikhail Ramendik
7847
days inactive
7849
days old
linux-audio-user@lists.linuxaudio.org
8 comments
4 participants
participants (4)
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Frank Barknecht -
Guy Clotilde -
Julien Patrick Claassen -
Mikhail Ramendik