[PD-dev] Creating an external / sinewave equation example
Rick T
ratulloch at gmail.com
Sat Sep 10 03:42:09 CEST 2011
On Fri, Sep 9, 2011 at 2:46 PM, Patrice Colet <colet.patrice at free.fr> wrote:
> Hello, I'm not a C expert but I see errors in your code
>
> ----- "Rick T" <ratulloch at gmail.com> a écrit :
>
> > Greetings All
> >
> >
> > I'm having trouble getting my external to work, It compiles with 5
> > warnings
> > sineq.c:48: warning: unused variable ‘x’
> > sineq.c:49: warning: unused variable ‘in1’
> > sineq.c:50: warning: unused variable ‘in2’
> > sineq.c:51: warning: unused variable ‘in3’
> > sineq.c:52: warning: unused variable ‘in4’
> >
>
> in http://iem.at/pd/externals-HOWTO/node6.html it's not a t_float but a
> t_sample for using those variables
>
> True but the variables in my external are floats not samples like in the
example pan~ which takes in 2 different signals. I'm taking in 4 different
floats (numbers)
>
> >
> > It does a "make" successfully but I get this warning message
> > /usr/bin/ld: warning: cannot find entry symbol xport_dynamic;
> > defaulting to 00000000000007f0
> >
>
> it's certainly caused by your makefile during linking, it's rather
> export_dynamic, you've certainly made a typo ^^
>
I thought so to but when I take a look at the make file it looks fine
here's a link to the code in (pastebin)
http://pastebin.com/n6DZivyY
# Makefile
# (c) 2006 IOhannes m zmölnig
# path to pd
## change this according to your setup!
PDROOT=../../../../pd
#PDROOT=/home/zmoelnig/src/pd/
# here we find the sources of pd (and evtl. the pd.lib)
PDSRCDIR=$(PDROOT)/src
PDLIBDIR=$(PDROOT)/bin
# this is the filename-extension
# people have to specify it at the cmdline: eg "make pd_linux"
EXTENSION=$(MAKECMDGOALS)
# if no filename-extension is supplied by the user
# try to guess one, based on what "uname" tells us
UNAME := $(shell uname -s)
ifeq ($(UNAME),Linux)
DEFAULTEXTENSION= pd_linux
else
ifeq ($(UNAME),Darwin)
DEFAULTEXTENSION= pd_darwin
else
ifeq (MINGW,$(findstring MINGW,$(UNAME)))
DEFAULTEXTENSION= pd_nt
else
ifeq ($(UNAME),IRIX)
UNAMEV := $(shell uname -R)
ifeq (6.,$(findstring 6.,$(UNAMEV)))
DEFAULTEXTENSION= pd_irix6
else
DEFAULTEXTENSION= pd_irix5
endif
else
DEFAULTEXTENSION=help
endif
endif
endif
endif
# if no extension is given, call "make" again with a guessed extension
auto:
make $(DEFAULTEXTENSION)
# just a stupid fallback
help:
@echo "choose one command: make pd_linux (linux), make pd_darwin (osX),
make pd_irix5 (IRIX5), make pd_irix6 (IRIX6), make dll (MSVC), make pd_nt
(MinWG)"
# delete old build files
clean:
-rm -f *.dll *.pd_* *.o *.obj *~
# we want to compile all C-files we find in the current directory
SOURCES=$(sort $(filter %.c, $(wildcard *.c)))
# each C-files maps will become an external with the given
filename-extension
TARGETS=$(SOURCES:.c=.$(EXTENSION))
# ----------------------- Linux -----------------------
pd_linux: $(TARGETS)
LINUXCFLAGS = -DPD -O2 -funroll-loops -fomit-frame-pointer -fPIC \
-Wall -W -Wshadow -Wstrict-prototypes -Werror \
-Wno-unused -Wno-parentheses -Wno-switch
LINUXLDFLAGS = -export_dynamic -shared -lc -lm
LINUXINCLUDE = -I$(PDSRCDIR)
%.pd_linux: %.c
$(CC) $(LINUXLDFLAGS) $(LINUXCFLAGS) $(LINUXINCLUDE) -o $*.pd_linux $*.c
strip --strip-unneeded $*.pd_linux
# ----------------------- Mac OSX -----------------------
pd_darwin: $(TARGETS)
DARWINCFLAGS = -DPD -O2 -Wall -W -Wshadow -Wstrict-prototypes \
-Wno-unused -Wno-parentheses -Wno-switch
DARWININCLUDE = -I$(PDSRCDIR)
DARWINLDFLAGS = -bundle -undefined suppress -flat_namespace
%.pd_darwin: %.c
$(CC) $(DARWINCFLAGS) $(DARWININCLUDE) $(DARWINLDFLAGS) -o $*.pd_darwin
$*.c
# ----------------------- IRIX 5.x -----------------------
pd_irix5: $(TARGETS)
SGICFLAGS5 = -o32 -DPD -DSGI -O2
SGIINCLUDE = -I$(PDSRCDIR)
SGILDFLAGS = -elf -shared -rdata_shared
%.pd_irix5: %.c
$(CC) $(SGICFLAGS5) $(SGIINCLUDE) -o $*.o -c $*.c
$(LD) $(SGILDFLAGS) -o $*.pd_irix5 $*.o
rm $*.o
# ----------------------- IRIX 6.x -----------------------
pd_irix6: $(TARGETS)
SGICFLAGS6 = -DPD -DSGI -n32 \
-OPT:roundoff=3 -OPT:IEEE_arithmetic=3 -OPT:cray_ivdep=true \
-Ofast=ip32
%.pd_irix6: %.c
$(CC) $(SGICFLAGS6) $(SGIINCLUDE) -o $*.o -c $*.c
$(LD) $(SGILDFLAGS) -o $*.pd_irix6 $*.o
rm $*.o
# ----------------------- NT -----------------------
dll: $(TARGETS)
PDNTCFLAGS = /W3 /WX /DPD /DNT /D__WIN32__ /DMSW /nologo
VC="C:\Programme\Microsoft Visual Studio\Vc98"
PDNTINCLUDE = /I. /I$(PDROOT)\tcl\include /I$(PDSRCDIR)\src /I$(VC)\include
PDNTLDIR = $(VC)\lib
PDNTLIB = $(PDNTLDIR)\libc.lib \
$(PDNTLDIR)\oldnames.lib \
$(PDNTLDIR)\kernel32.lib \
$(PDLIBDIR)\pd.lib
%.dll: %.c
cl $(PDNTCFLAGS) $(PDNTINCLUDE) /c $*.c
link /dll /export:$*_setup $*.obj $(PDNTLIB)
pd_nt: $(TARGETS)
MINGWCFLAGS = -DPD -O2 -funroll-loops -fomit-frame-pointer \
-Wall -W -Wshadow -Wstrict-prototypes -Werror \
-Wno-unused -Wno-parentheses -Wno-switch -mms-bitfields
MINGWLDFLAGS = -export_dynamic -shared -lm -lkernel32 -lcoldname -lcrtdll
-lpd -L$(PDLIBDIR)
MINGWINCLUDE = -I$(PDSRCDIR)
%.pd_nt: %.c
$(CC) $(MINGWLDFLAGS) $(MINGWCFLAGS) $(MINGWINCLUDE) -o $*.dll $*.c
> >
> > but when I try and add it in PD it says "couldn't create". I've looked
> > at the pan~ tutorial and the d_osc.c file as recommended, which did
> > help. I tried to take pieces from the two which I thought were
> > applicable to my situation but I'm still having some issues.
> >
>
> maybe a little look into bassmu~ source code could also be interesting
>
Do you know the name for the source file or know where I can find it? I
typed in bassmu~
in PD and nothing came back.
> >
> > Here's a link to the workflow (dropbox)
> > http://dl.dropbox.com/u/6576402/questions/pd/Sine_EQ_Diagram.jpg
> >
> >
> > Here's a link to the C code online (pastebin)
> > http://pastebin.com/9rK3szUE
> >
> >
> >
> >
> > My external is a reproduction of the sinewave equation with 4 inputs
> > and one output my logic is to have 4 inlets one for the
> > frequency,amplitude,phase and vertical offset and an output for the
> > created signal. Granted this isn't the final equation but this will
> > help me understand how to create the full equation once done. If you
> > want to see the full equation I'll be using here's a link to it below.
> > Basically it's a 1 second periodic signal with the sample rate at
> > 44100 which the equation gives me control over the
> > frequency,amplitude,phase and vertical offset, which will be
> > controlled by a usb midi controller.
> >
> >
> > Another question I have is what do I use for the t (time) for my final
> > equation is that the t_sample object in PD? or do I need to create a
> > for loop counting from 1-44100 for a 1 second 44100 sampled equation?
> >
> >
> > http://dl.dropbox.com/u/6576402/questions/eq1.txt
> >
> >
> >
> >
> > PS: I'm compiling on ubuntu 10.04 using gcc
> >
> > On Sun, Sep 4, 2011 at 12:13 PM, Martin Peach <
> > martin.peach at sympatico.ca > wrote:
> >
> >
> > On 2011-09-04 16:52, Rick T wrote:
> > ...
> >
> >
> >
> >
> > I've been able to find instructions on how to create a hello world
> > C-external but not one that creates a simple sine wave from a sinewave
> > equation like A*sin(w*t+p)
> > ( https://secure.wikimedia.org/ wikipedia/en/wiki/Sine_wave ) Does
> > anyone
> > have one or know where to find one.
> >
> > The canonical reference is here:
> > http://iem.at/pd/externals- HOWTO/node6.html
> > You just need to plug your equation into the perform routine.
> > Also check the source for osc~ in d_osc.c of the Pd source, which uses
> > a fancy 32-bit float cosine table scanning method that was useful when
> > it mattered but is getting obsolete as a call to sin() is probably
> > just as fast nowadays.
> >
> > Martin
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > Pd-dev mailing list
> > Pd-dev at iem.at
> > http://lists.puredata.info/listinfo/pd-dev
>
> --
> Patrice Colet
>
Aloha
and thanks for the help every bit helps
--
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