shithub: soundpipe

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added gen_sinesum

--- a/h/ftbl.h

+++ b/h/ftbl.h

@@ -16,3 +16,4 @@

 int sp_gen_sine(sp_data *sp, sp_ftbl *ft);

 void sp_gen_triangle(sp_data *sp, sp_ftbl *ft);

 void sp_gen_composite(sp_data *sp, sp_ftbl *ft, const char *argstring);

+void sp_gen_sinesum(sp_data *sp, sp_ftbl *ft, const char *argstring);

--- a/modules/ftbl.c

+++ b/modules/ftbl.c

@@ -153,3 +153,30 @@

     sp_ftbl_destroy(&args);

 }

+

+void sp_gen_sinesum(sp_data *sp, sp_ftbl *ft, const char *argstring)

+{

+    sp_ftbl *args;

+    int32_t phs;

+    SPFLOAT amp;

+    int32_t flen;

+    SPFLOAT tpdlen;

+    int32_t i, n;

+

+    sp_ftbl_create(sp, &args, 1);

+    sp_gen_vals(sp, args, argstring);

+    flen = (int32_t)ft->size;

+    tpdlen = 2.0 * M_PI / (SPFLOAT) flen;

+

+    for (i = (int32_t)args->size; i > 0; i--) {

+        amp = args->tbl[i - 1];

+        if (amp != 0) {

+            for (phs = 0, n = 0; n < ft->size; n++) {

+                ft->tbl[n] += sin(phs * tpdlen) * amp;

+                phs += i;

+                phs %= flen;

+            }

+        }

+    }

+    sp_ftbl_destroy(&args);

+}