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authorFranz Zotter <fzotter@users.sourceforge.net>2008-07-22 09:18:54 +0000
committerFranz Zotter <fzotter@users.sourceforge.net>2008-07-22 09:18:54 +0000
commit9f78b7b8b2ea1729389a1bbb09364a2a1c6f2781 (patch)
treed762cc4340fe8dc40005bd85a1db22f908f806f2 /src/mtx_rfft.c
parente57133af3f8ba27be56c5b9eb59a9ff747783874 (diff)
changed from mtx_rowrfft and mtx_rowrifft to
mtx_rfft and mtx_rifft svn path=/trunk/externals/iem/iemmatrix/; revision=10193
Diffstat (limited to 'src/mtx_rfft.c')
-rw-r--r--src/mtx_rfft.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/src/mtx_rfft.c b/src/mtx_rfft.c
new file mode 100644
index 0000000..e97f338
--- /dev/null
+++ b/src/mtx_rfft.c
@@ -0,0 +1,192 @@
+/*
+ * iemmatrix
+ *
+ * objects for manipulating simple matrices
+ * mostly refering to matlab/octave matrix functions
+ *
+ * Copyright (c) 2005, Franz Zotter
+ * IEM, Graz, Austria
+ *
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+ *
+ */
+
+#include "iemmatrix.h"
+#include <stdlib.h>
+
+static t_class *mtx_rfft_class;
+
+typedef struct _MTXRfft_ MTXRfft;
+struct _MTXRfft_
+{
+ t_object x_obj;
+ int size;
+ int size2;
+
+ t_float *f_re;
+ t_float *f_im;
+
+ t_outlet *list_re_out;
+ t_outlet *list_im_out;
+
+ t_atom *list_re;
+ t_atom *list_im;
+};
+
+static void deleteMTXRfft (MTXRfft *x)
+{
+ if (x->f_re)
+ free (x->f_re);
+ if (x->f_im)
+ free (x->f_im);
+ if (x->list_re)
+ free (x->list_re);
+ if (x->list_im)
+ free (x->list_im);
+}
+
+static void *newMTXRfft (t_symbol *s, int argc, t_atom *argv)
+{
+ MTXRfft *x = (MTXRfft *) pd_new (mtx_rfft_class);
+ x->list_re_out = outlet_new (&x->x_obj, gensym("matrix"));
+ x->list_im_out = outlet_new (&x->x_obj, gensym("matrix"));
+
+ x->size=x->size2=0;
+ x->f_re=x->f_im=0;
+ x->list_re=x->list_im=0;
+
+ return ((void *) x);
+}
+
+static void mTXRfftBang (MTXRfft *x)
+{
+ if (x->list_im) {
+ outlet_anything(x->list_im_out, gensym("matrix"), x->size2, x->list_im);
+ outlet_anything(x->list_re_out, gensym("matrix"), x->size2, x->list_re);
+ }
+}
+
+static void fftRestoreImag (int n, t_float *re, t_float *im)
+{
+ t_float *im2;
+ n >>= 1;
+ *im=0;
+ re += n;
+ im += n;
+ im2 = im;
+ *im=0;
+ while (--n) {
+ *--im = -*++re;
+ *++im2 = 0;
+ *re = 0;
+ }
+}
+
+static void zeroFloatArray (int n, t_float *f)
+{
+ while (n--)
+ *f++ = 0.0f;
+}
+
+static void writeFloatIntoList (int n, t_atom *l, t_float *f)
+{
+ for (;n--;f++, l++)
+ SETFLOAT (l, *f);
+}
+static void readFloatFromList (int n, t_atom *l, t_float *f)
+{
+ while (n--)
+ *f++ = atom_getfloat (l++);
+}
+
+static void mTXRfftMatrix (MTXRfft *x, t_symbol *s,
+ int argc, t_atom *argv)
+{
+ int rows = atom_getint (argv++);
+ int columns = atom_getint (argv++);
+ int columns_re = (columns>>1)+1; /* N/2+1 samples needed for real part of realfft */
+ int size = rows * columns;
+ int in_size = argc-2;
+ int size2 = columns_re * rows + 2; /* +2 since the list also contains matrix row+col */
+ int fft_count;
+ t_atom *list_re = x->list_re;
+ t_atom *list_im = x->list_im;
+ t_float *f_re = x->f_re;
+ t_float *f_im = x->f_im;
+
+ /* fftsize check */
+ if (!size)
+ post("mtx_rfft: invalid dimensions");
+ else if (in_size<size)
+ post("mtx_rfft: sparse matrix not yet supported: use \"mtx_check\"");
+ else if (columns < 4){
+ post("mtx_rfft: matrix must have at least 4 columns");
+ }
+ else if (columns == (1 << ilog2(columns))) {
+ /* ok, do the FFT! */
+
+ /* memory things */
+ f_re=(t_float*)realloc(f_re, sizeof(t_float)*size);
+ f_im=(t_float*)realloc(f_im, sizeof(t_float)*size);
+ list_re=(t_atom*)realloc(list_re, sizeof(t_atom)*size2);
+ list_im=(t_atom*)realloc(list_im, sizeof(t_atom)*size2);
+
+ x->size = size;
+ x->size2 = size2;
+ x->list_im = list_im;
+ x->list_re = list_re;
+ x->f_re = f_re;
+ x->f_im = f_im;
+
+ /* main part */
+ readFloatFromList (size, argv, f_re);
+
+ fft_count = rows;
+ list_re += 2;
+ list_im += 2;
+ while (fft_count--){
+ mayer_realfft (columns, f_re);
+ fftRestoreImag (columns, f_re, f_im);
+ writeFloatIntoList (columns_re, list_re, f_re);
+ writeFloatIntoList (columns_re, list_im, f_im);
+ f_im += columns;
+ f_re += columns;
+ list_re += columns_re;
+ list_im += columns_re;
+ }
+
+ list_re = x->list_re;
+ list_im = x->list_im;
+
+ SETSYMBOL(list_re, gensym("matrix"));
+ SETSYMBOL(list_im, gensym("matrix"));
+ SETFLOAT(list_re, rows);
+ SETFLOAT(list_im, rows);
+ SETFLOAT(list_re+1, columns_re);
+ SETFLOAT(list_im+1, columns_re);
+ outlet_anything(x->list_im_out, gensym("matrix"),
+ x->size2, list_im);
+ outlet_anything(x->list_re_out, gensym("matrix"),
+ x->size2, list_re);
+ }
+ else
+ post("mtx_rowfft: rowvector size no power of 2!");
+
+}
+
+void mtx_rfft_setup (void)
+{
+ mtx_rfft_class = class_new
+ (gensym("mtx_rfft"),
+ (t_newmethod) newMTXRfft,
+ (t_method) deleteMTXRfft,
+ sizeof (MTXRfft),
+ CLASS_DEFAULT, A_GIMME, 0);
+ class_addbang (mtx_rfft_class, (t_method) mTXRfftBang);
+ class_addmethod (mtx_rfft_class, (t_method) mTXRfftMatrix, gensym("matrix"), A_GIMME,0);
+}
+
+void iemtx_rfft_setup(void){
+ mtx_rfft_setup();
+}