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authorCyrille Henry <nusmuk@users.sourceforge.net>2008-06-10 08:59:57 +0000
committerCyrille Henry <nusmuk@users.sourceforge.net>2008-06-10 08:59:57 +0000
commit5db0b4008f30da3c416efbb36eb17174332b69b9 (patch)
tree680a7197e4d5b7398a20444a36e9ec164ef9f851 /tab/tabosc4cloop~.c
parent298702e000da510898e81b77d5de598885412794 (diff)
replacement for tabread4~ and tabosc4~ with a better cubic interpolation
svn path=/trunk/externals/nusmuk/; revision=9979
Diffstat (limited to 'tab/tabosc4cloop~.c')
-rw-r--r--tab/tabosc4cloop~.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/tab/tabosc4cloop~.c b/tab/tabosc4cloop~.c
new file mode 100644
index 0000000..a2ac53c
--- /dev/null
+++ b/tab/tabosc4cloop~.c
@@ -0,0 +1,205 @@
+// GPL
+// most of this code comes from pd. just the interpolation shematic is diferent.
+// and the modulo for the position is made for all sample, so you do'nt need to copy the last 3 point in the beggining
+
+
+#include "m_pd.h"
+
+/******************** tabosc4cloop~ ***********************/
+
+/* this is all copied from d_osc.c... what include file could this go in? */
+#define UNITBIT32 1572864. /* 3*2^19; bit 32 has place value 1 */
+
+ /* machine-dependent definitions. These ifdefs really
+ should have been by CPU type and not by operating system! */
+#ifdef IRIX
+ /* big-endian. Most significant byte is at low address in memory */
+#define HIOFFSET 0 /* word offset to find MSB */
+#define LOWOFFSET 1 /* word offset to find LSB */
+#define int32 long /* a data type that has 32 bits */
+#endif /* IRIX */
+
+#ifdef MSW
+ /* little-endian; most significant byte is at highest address */
+#define HIOFFSET 1
+#define LOWOFFSET 0
+#define int32 long
+#endif
+
+#if defined(__FreeBSD__) || defined(__APPLE__)
+#include <machine/endian.h>
+#endif
+
+#ifdef __linux__
+#include <endian.h>
+#endif
+
+#if defined(__unix__) || defined(__APPLE__)
+#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
+#error No byte order defined
+#endif
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define HIOFFSET 1
+#define LOWOFFSET 0
+#else
+#define HIOFFSET 0 /* word offset to find MSB */
+#define LOWOFFSET 1 /* word offset to find LSB */
+#endif /* __BYTE_ORDER */
+#include <sys/types.h>
+#define int32 int32_t
+#endif /* __unix__ or __APPLE__*/
+
+union tabfudge
+{
+ double tf_d;
+ int32 tf_i[2];
+};
+
+static t_class *tabosc4cloop_tilde_class;
+
+typedef struct _tabosc4cloop_tilde
+{
+ t_object x_obj;
+ t_float x_fnpoints;
+ t_float x_finvnpoints;
+ t_word *x_vec;
+ t_symbol *x_arrayname;
+ t_float x_f;
+ double x_phase;
+ t_float x_conv;
+} t_tabosc4cloop_tilde;
+
+static void *tabosc4cloop_tilde_new(t_symbol *s)
+{
+ t_tabosc4cloop_tilde *x = (t_tabosc4cloop_tilde *)pd_new(tabosc4cloop_tilde_class);
+ x->x_arrayname = s;
+ x->x_vec = 0;
+ x->x_fnpoints = 512.;
+ x->x_finvnpoints = (1./512.);
+ outlet_new(&x->x_obj, gensym("signal"));
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+ x->x_f = 0;
+ return (x);
+}
+
+static t_int *tabosc4cloop_tilde_perform(t_int *w)
+{
+ t_tabosc4cloop_tilde *x = (t_tabosc4cloop_tilde *)(w[1]);
+ t_sample *in = (t_sample *)(w[2]);
+ t_sample *out = (t_sample *)(w[3]);
+ int n = (int)(w[4]);
+ int normhipart;
+ union tabfudge tf;
+ double a0,a1,a2,a3; // CH
+ t_float fnpoints = x->x_fnpoints;
+ int mask = fnpoints -1;
+ t_float conv = fnpoints * x->x_conv;
+ int maxindex;
+ t_word *tab = x->x_vec, *addr;
+ int i;
+ double dphase = fnpoints * x->x_phase + UNITBIT32;
+
+ if (!tab) goto zero;
+ tf.tf_d = UNITBIT32;
+ normhipart = tf.tf_i[HIOFFSET];
+
+#if 1
+ while (n--)
+ {
+ t_sample frac, a, b, c, d, cminusb;
+ tf.tf_d = dphase;
+ dphase += *in++ * conv;
+ addr = tab + (tf.tf_i[HIOFFSET] & mask);
+// thx to dh
+ a = addr[0].w_float;
+ addr = tab + ((1+tf.tf_i[HIOFFSET]) & mask);
+ b = addr[0].w_float;
+ addr = tab + ((2+tf.tf_i[HIOFFSET]) & mask);
+ c = addr[0].w_float;
+ addr = tab + ((3+tf.tf_i[HIOFFSET]) & mask);
+ d = addr[0].w_float;
+ tf.tf_i[HIOFFSET] = normhipart;
+ frac = tf.tf_d - UNITBIT32;
+// CH
+ a0 = d - c - a + b;
+ a1 = a - b - a0;
+ a2 = c - a;
+ a3 = b;
+ *out++ = ((a0*frac+a1)*frac+a2)*frac+a3;
+
+ }
+#endif
+
+ tf.tf_d = UNITBIT32 * fnpoints;
+ normhipart = tf.tf_i[HIOFFSET];
+ tf.tf_d = dphase + (UNITBIT32 * fnpoints - UNITBIT32);
+ tf.tf_i[HIOFFSET] = normhipart;
+ x->x_phase = (tf.tf_d - UNITBIT32 * fnpoints) * x->x_finvnpoints;
+ return (w+5);
+ zero:
+ while (n--) *out++ = 0;
+
+ return (w+5);
+}
+
+void tabosc4cloop_tilde_set(t_tabosc4cloop_tilde *x, t_symbol *s)
+{
+ t_garray *a;
+ int npoints, pointsinarray;
+
+ x->x_arrayname = s;
+ if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
+ {
+ if (*s->s_name)
+ pd_error(x, "tabosc4cloop~: %s: no such array", x->x_arrayname->s_name);
+ x->x_vec = 0;
+ }
+ else if (!garray_getfloatwords(a, &pointsinarray, &x->x_vec))
+ {
+ pd_error(x, "%s: bad template for tabosc4cloop~", x->x_arrayname->s_name);
+ x->x_vec = 0;
+ }
+ else if (pointsinarray != (1 << ilog2(pointsinarray)))
+ {
+ pd_error(x, "%s: number of points (%d) not a power of 2",
+ x->x_arrayname->s_name, pointsinarray);
+ x->x_vec = 0;
+ garray_usedindsp(a);
+ }
+ else
+ {
+ x->x_fnpoints = pointsinarray;
+ x->x_finvnpoints = 1./pointsinarray;
+ garray_usedindsp(a);
+ }
+}
+
+static void tabosc4cloop_tilde_ft1(t_tabosc4cloop_tilde *x, t_float f)
+{
+ x->x_phase = f;
+}
+
+static void tabosc4cloop_tilde_dsp(t_tabosc4cloop_tilde *x, t_signal **sp)
+{
+ x->x_conv = 1. / sp[0]->s_sr;
+ tabosc4cloop_tilde_set(x, x->x_arrayname);
+
+ dsp_add(tabosc4cloop_tilde_perform, 4, x,
+ sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void tabosc4cloop_tilde_setup(void)
+{
+ tabosc4cloop_tilde_class = class_new(gensym("tabosc4cloop~"),
+ (t_newmethod)tabosc4cloop_tilde_new, 0,
+ sizeof(t_tabosc4cloop_tilde), 0, A_DEFSYM, 0);
+ CLASS_MAINSIGNALIN(tabosc4cloop_tilde_class, t_tabosc4cloop_tilde, x_f);
+ class_addmethod(tabosc4cloop_tilde_class, (t_method)tabosc4cloop_tilde_dsp,
+ gensym("dsp"), 0);
+ class_addmethod(tabosc4cloop_tilde_class, (t_method)tabosc4cloop_tilde_set,
+ gensym("set"), A_SYMBOL, 0);
+ class_addmethod(tabosc4cloop_tilde_class, (t_method)tabosc4cloop_tilde_ft1,
+ gensym("ft1"), A_FLOAT, 0);
+}
+