OK, so I looked at the makefile in externals/build/linux and this is my new makefile (which seems to work): -----------makefile-------------------------------- LDFLAGS = -Wl,-export_dynamic -shared LIB = -lc -lm

INCLUDE = -I. -I/usr/local/include BIN_DIR = ../general LIB_DIR = lib

EXT = pd_linux STRIP = strip --strip-unneeded -R .note -R .comment CC = gcc

LINUXCFLAGS = -fPIC -DPD -DUNIX -O2 -funroll-loops -fomit-frame-pointer \ -Wall -W -Wshadow -Wstrict-prototypes \ -Wno-unused -Wno-parentheses -Wno-switch

sphere: $(CC) $(LINUXCFLAGS) $(INCLUDE) -o $(LIB_DIR)/sphere~.o -c sphere~.c $(CC) $(LDFLAGS) -o $(BIN_DIR)/sphere~.$(EXT) $(LIB_DIR)/sphere~.o $(LIB) chmod a-x "$(BIN_DIR)/sphere~.$(EXT)" $(STRIP) sphere~.$(EXT) rm -f "$(LIB_DIR)/sphere~.o"

fftbin: $(CC) $(LINUXCFLAGS) $(INCLUDE) -o $(LIB_DIR)/fftbin~.o -c fftbin~.c $(CC) $(LDFLAGS) -o $(BIN_DIR)/fftbin~.$(EXT) $(LIB_DIR)/fftbin~.o $(LIB) chmod a-x $(BIN_DIR)/fftbin~.$(EXT) $(STRIP) $(BIN_DIR)/fftbin~.$(EXT) rm -f $(LIB_DIR)/fftbin~.o

So, my external loads fine, but when I invoke it I get: Segmentation fault which is an error I cant really use to debug, other then my my perform function is using too many (t_int *w) elements, or Im not asking for enough elements in my dsp function. Also I get too many inlets. I want one signal rate inlet that takes signal and bang, like snapshot, and another that takes in control rate floats (int). The dsp_add function and its relation to the perform functions (t_int *w) has always confused me. Could someone help me to get this straight in my head?

Thanks for all the help Frank and carmen, -thewade

Heres my code again: ------fftbin~.c------------------------------------- #include <m_pd.h>

/*-------------------------------------------------------*/ /*fftbin~ */ /* A tool to extract specific bins from the output of */ /* fft~. Inlets are (from left to right): */ /* The output of fft~ and bang, the bin number to */ /* capture. */ /* The outlet is a control rate float equal to the value */ /* of the bin in question. */ /*-------------------------------------------------------*/

static t_class *fftbin_tilde_class;

typedef struct _fftbin { t_object x_obj; t_sample dummy; int x_bin; float x_f; } t_fftbin;

void *fftbin_tilde_new(t_floatarg f) { t_symbol *p_signal = gensym("signal"); t_symbol *p_float = gensym("float");

t_fftbin *ref = (t_fftbin *)pd_new(fftbin_tilde_class); ref->x_bin=f; ref->x_f=0; inlet_new(&ref->x_obj, &ref->x_obj.ob_pd, p_signal, p_signal); //signal/bang inlet inlet_new(&ref->x_obj, &ref->x_obj.ob_pd, p_float, p_float); //bin inlet outlet_new(&ref->x_obj, p_float); //bin value outlet return (void *)ref; }

t_int *fftbin_tilde_perform(t_int *w) { t_fftbin *ref = (t_fftbin *)(w[1]); //data structure t_sample *in1 = (t_sample *)(w[2]); //fft~ output int in2 = (int)(w[3]); //bin number t_sample *out = (t_float *)(w[4]); //outlet int n = (int)(w[5]); //number of samples in block

int bin = in2; //get bin number if (bin<0) bin = 0; //clip bin to between 0 and n-1 if (bin>=n) bin = n-1; ref->x_bin = bin; //set datstructure ref->x_f = (t_float)*in1+ref->x_bin; //again, set datastructure *out = ref->x_f; //output float value of bin

return (w+6); }

void fftbin_tilde_dsp(t_fftbin *ref, t_signal **sp) { dsp_add(fftbin_tilde_perform, 5, ref, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n); //trying to send datastructure, block of samples (inlet 1), and float (inlet 2) //to perform's t_int *w }

void fftbin_tilde_set(t_fftbin *x, t_floatarg f) { x->x_f = f; }

void fftbin_tilde_bang(t_fftbin *x) { outlet_float(x->x_obj.ob_outlet, x->x_f); }

void fftbin_tilde_setup(void) { fftbin_tilde_class = class_new(gensym("fftbin~"), (t_newmethod)fftbin_tilde_new, 0, sizeof(t_fftbin), CLASS_DEFAULT, A_DEFFLOAT, 0);

class_addmethod(fftbin_tilde_class, (t_method)fftbin_tilde_dsp, gensym("dsp"), 0); class_addmethod(fftbin_tilde_class, (t_method)fftbin_tilde_set, gensym("set"), A_DEFFLOAT, 0); class_addbang(fftbin_tilde_class, fftbin_tilde_bang);

CLASS_MAINSIGNALIN(fftbin_tilde_class, t_fftbin, x_f); post("fftbin~: written by thewade with help from the PD list"); }