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We have experienced some problems in reading midifiles under linux.
Reading a Midifile with an orchestra with kr running at 441 results in an
exceedingly slower tempo than what expected (ca. 5 times slower).
A little investigation brought out that the Midifile gets evaluated
before the orchestra (musmon.c, line 162) and thus the ticksperseconds
value gets calculated on the default kr DFLT_KR which happens to be 4410.
Exchanging lines between the call to oload() and the call to
FMidiOpen() results in a correct evaluation of the ekr variable.
Still, the speed is not perfect, and as a matter of fact, it ends up
being ca. twice as fast than expected! There is a suspect passage
in midirecv.c at line 260
short Qticks = natshort(*(short *)(inbytes+4));
printf("Metrical timing, Qtempo = 120.0, Qticks = %d\n", Qticks);
ekrdQmil = ekr / Qticks / 1000000.;
tickspersec = Qticks * 2; <====== THIS ONE
}
kprdspertick = ekr / tickspersec;
printf("kperiods/tick = %7.3f\n", kprdspertick);
in which the Qticks get indeed multiplied by two. Removing that multiplication
produces the correct tempo.
Does anybody know the reason of that multiplication?
At any rate, I add the diff file for musmon.c and midirecv.c.
Nicola
------------------------------------------------------------------------
Nicola Bernardini
E-mail: nicb@axnet.it
Re graphics: A picture is worth 10K words -- but only those to describe
the picture. Hardly any sets of 10K words can be adequately described
with pictures.
------------------------------------------------------------------------
*** musmon.c.orig Mon Aug 24 01:20:16 1998
--- musmon.c Mon Aug 24 01:20:19 1998
***************
*** 162,169 ****
#else
MidiOpen(); /* alloc bufs & open files */
#endif
- if (O.FMidiin) FMidiOpen();
oload(); /* set globals and run inits */
printf("orch now loaded\n");
#ifdef __MWERKS__
fflush(stdout);
--- 162,169 ----
#else
MidiOpen(); /* alloc bufs & open files */
#endif
oload(); /* set globals and run inits */
+ if (O.FMidiin) FMidiOpen();
printf("orch now loaded\n");
#ifdef __MWERKS__
fflush(stdout);
*** midirecv.c.orig Mon Aug 24 01:25:45 1998
--- midirecv.c Mon Aug 24 01:25:51 1998
***************
*** 260,266 ****
short Qticks = natshort(*(short *)(inbytes+4));
printf("Metrical timing, Qtempo = 120.0, Qticks = %d\n", Qticks);
ekrdQmil = ekr / Qticks / 1000000.;
! tickspersec = Qticks * 2;
}
kprdspertick = ekr / tickspersec;
printf("kperiods/tick = %7.3f\n", kprdspertick);
--- 260,266 ----
short Qticks = natshort(*(short *)(inbytes+4));
printf("Metrical timing, Qtempo = 120.0, Qticks = %d\n", Qticks);
ekrdQmil = ekr / Qticks / 1000000.;
! tickspersec = Qticks;
}
kprdspertick = ekr / tickspersec;
printf("kperiods/tick = %7.3f\n", kprdspertick);
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Message-ID: <004201bdcf2c$857e4ec0$0300a8c0@roger.apas.no>
From: roger k
To: csound , David Schuyeteneer
Subject: Re: [??] Japanese Noise site
Date: Mon, 24 Aug 1998 08:56:54 +0200
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>any www site dedicated to this Japanese Noise ????
Extreme music has records and some info on Merzbow and other artists ( not
japanese though )
http://www.xtr.com/
--------
\ f(roger klaveness) = roger@apas.no +
http://home.c2i.net/roklaven/
--------
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Message-ID: <35E1282A.FF173D61@sci.fi>
Date: Mon, 24 Aug 1998 11:45:30 +0300
From: Matti Koskinen
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Subject: butterbp broken?
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Hello
using butterbp as follows
k1 line p4,p3,p5
a1 butterbp ain,k1,k1/10
a2 balance a1,ain
out a2
gives sometimes zero output, but shows samples out of range
using reson, everything works ok.
Does butterbp start to oscillate under some conditions?
(just a wild guess)
these both with linux 3.482 and Nicola's 3.484
-matti
mjkoskin@sci.fi
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Mon, 24 Aug 1998 10:58:01 +0200
Date: Mon, 24 Aug 1998 10:58:00 +0200 (MET DST)
From: Nicola Bernardini
To: Matti Koskinen
cc: csound@maths.ex.ac.uk
Subject: Re: butterbp broken?
In-Reply-To: <35E1282A.FF173D61@sci.fi>
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On Mon, 24 Aug 1998, Matti Koskinen wrote:
[snip]
> using butterbp as follows
>
> k1 line p4,p3,p5
> a1 butterbp ain,k1,k1/10
> a2 balance a1,ain
> out a2
>
> gives sometimes zero output, but shows samples out of range
> using reson, everything works ok.
>
> Does butterbp start to oscillate under some conditions?
> (just a wild guess)
>
> these both with linux 3.482 and Nicola's 3.484
can you give us an idea of what numbers you set in p4 and p5 (if you
could send a demo orc and sco of what creates the problem, that would be
great)
thank you
Nicola
------------------------------------------------------------------------
Nicola Bernardini
E-mail: nicb@axnet.it
Re graphics: A picture is worth 10K words -- but only those to describe
the picture. Hardly any sets of 10K words can be adequately described
with pictures.
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Mon, 24 Aug 1998 12:24:24 +0200
Date: Mon, 24 Aug 1998 12:24:22 +0200 (MET DST)
From: Nicola Bernardini
To: Matti Koskinen
cc: Csound Linux/Unix Development Group ,
Csound mailing list
Subject: Re: butterbp broken?
In-Reply-To: <35E13FC7.3F95EFB4@sci.fi>
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On Mon, 24 Aug 1998, Matti Koskinen wrote:
[snip]
> Using hp gives truly out of range samples and the output is distorted,
> but bp gives just samples out of range with no output.
I can't look until tonight. But I'll give a look tonight...
[snip]
> Also another question, as you know about csound-code. Why some
> instruments above 200 are undefined when compiling orc. E.g. i had
> instr 201 and instr 202 and csound said that instr 201 is undefined
> giving some number in parenthesis after error text. Also the same came
> out with ftables > 60. I debugged a bit csound and the routine that
> checks ftable goes ok for few first rounds, then it returns an error.
> As this code is unfamiliar, i just let it be, and changed my orc/scores.
> Any ideas?
Tonight...
ciao
Nicola
------------------------------------------------------------------------
Nicola Bernardini
E-mail: nicb@axnet.it
Re graphics: A picture is worth 10K words -- but only those to describe
the picture. Hardly any sets of 10K words can be adequately described
with pictures.
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