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author | IOhannes m zmölnig <zmoelnig@users.sourceforge.net> | 2005-03-22 20:58:25 +0000 |
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committer | IOhannes m zmölnig <zmoelnig@users.sourceforge.net> | 2005-03-22 20:58:25 +0000 |
commit | 2b60d55c919e7588f5aff15936e83c300b3660bb (patch) | |
tree | 14d860de7f28083d3756ad91b627de70f26788f6 /src/z_noise.c | |
parent | c500bc542cb7cc78d6dac3f7da3bff626056b1aa (diff) |
zexy-2.0:
- use of abstractions for objects that allow it
- some objects are build both as externals and abstractions (as slower fallbacks)
- code-layout is now 1:1 c-file<->object (this should allow for building of zexy as a collection of externals instead as a big library)
- matrix-objects have moved to iemmatrix !!
svn path=/trunk/externals/zexy/; revision=2641
Diffstat (limited to 'src/z_noise.c')
-rw-r--r-- | src/z_noise.c | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/src/z_noise.c b/src/z_noise.c deleted file mode 100644 index 9d555bd..0000000 --- a/src/z_noise.c +++ /dev/null @@ -1,289 +0,0 @@ -/* - 30041999 - - two bandlimited noise gnerators based on DODGE/JERSE "computer music" c3.9 : RANDI & RANDH - - I do not care for copyrights - (all in all, the used noise~-code (in fact, the pseude-random-code) is from Miller Puckette - and I made only very few modifications so look out for the LICENSE.TXT delivered with - puredata for further (c)-information - - forum für umläute 1999 - - this is in fact the very same as the late "NOISE.C", except that I tried to optimize the code a little bit - (by partially removing those very expensive if..then's in about 15 minutes, so there are thousands of new bugs very likely) - - 14071999 - finally added changing seeds, this is to prevent to noise~-units to output the very same, something quite unnatural even for pseudo-random-noise -*/ - -#include "zexy.h" -#ifdef NT -#pragma warning( disable : 4244 ) -#pragma warning( disable : 4305 ) -#endif - -/* general */ - -typedef struct _nois -{ - t_object x_obj; - int val; - t_float current; - t_float decrement; - t_float updater; - t_float to_go; -} t_nois; - - -static void set_freq(t_nois *x, t_floatarg freq) -{ - x->updater = (freq > 0) ? sys_getsr() / freq : 1; - if (x->updater < 1) - { - x->updater = 1; - } - x->to_go = 0; -} - - -/* ------------------------ noish~ ----------------------------- */ - -static t_class *noish_class; - -static t_int *noish_perform(t_int *w) -{ - t_nois *x = (t_nois *)(w[1]); - t_float *out = (t_float *)(w[2]); - int n = (int)(w[3]); - - int *vp = (int *)(&x->val); - int i_value = *vp; - t_float f_value = ((float)((i_value & 0x7fffffff) - 0x40000000)) * - (float)(1.0 / 0x40000000); - t_float all_to_go = x->updater; - t_float still_to_go = x->to_go; - - if (all_to_go == 1) - { /* this is "pure white" noise, so we have to calculate each sample */ - while (n--) - { - i_value *= 435898247; - i_value += 382842987; - *out++ = ((float)((i_value & 0x7fffffff) - 0x40000000)) * (float)(1.0 / 0x40000000); - } - } - else - if (n < still_to_go) - { /* signal won't change for the next 64 samples */ - still_to_go -= n; - while (n--) - { - *out++ = f_value; - } - } - else - if (all_to_go + still_to_go > n) - { /* only one update calculation necessary for 64 samples !!! */ - while (still_to_go-- > 0) - { - n--; - *out++ = f_value; - } - - still_to_go += all_to_go + 1; - - i_value *= 435898247; - i_value += 382842987; - f_value = ( (float)((i_value & 0x7fffffff) - 0x40000000) ) * (float)(1.0 / 0x40000000); - - while (n--) - { - still_to_go--; - *out++ = f_value; - } - } - else - { /* anything else */ - while (n--) - { - if (still_to_go-- <= 0) /* update only if all time has elapsed */ - { - still_to_go += all_to_go; - - i_value *= 435898247; - i_value += 382842987; - - f_value = ( (float)((i_value & 0x7fffffff) - 0x40000000) ) * (float)(1.0 / 0x40000000); - } - *out++ = f_value; - } - } - - - *vp = i_value; - x->updater = all_to_go; - x->to_go = still_to_go; - - return (w+4); -} - -static void noish_dsp(t_nois *x, t_signal **sp) -{ - post("sr=%f\nsn=%f", sp[0]->s_sr, sp[0]->s_n); - dsp_add(noish_perform, 3, x, sp[0]->s_vec, sp[0]->s_n); -} - -static void noish_helper(void) -{ - post("\n%c noish~\t:: a bandlimited pseudo-noise generator", HEARTSYMBOL); - post("<freq>\t : sampling-frequency (in Hz)\n" - "'help'\t : view this"); - post("creation : \"noish~ [<freq>]\"\t: ('0'(default) will produce 'white' noise)\n"); - post("note\t : the seed of the pseudo-noise generator changes from\n" - "\t instance to instance, so two noish~-objects created at the\n" - "\t same time will produce dífferent signals, something the original\n" - "\t noise~-object misses\n"); - post("for further details see DODGE/JERSE \"computer music\" c3.9\n"); -} - -static void *noish_new(t_floatarg f) -{ - t_nois *x = (t_nois *)pd_new(noish_class); - - static int init = 307; - x->val = (init *= 13); - - set_freq(x, f); - - outlet_new(&x->x_obj, gensym("signal")); - return (x); -} - -void noish_setup(void) -{ - noish_class = class_new(gensym("noish~"), (t_newmethod)noish_new, 0, sizeof(t_nois), 0, A_DEFFLOAT, 0); - - class_addfloat(noish_class, set_freq); - class_addmethod(noish_class, (t_method)noish_dsp, gensym("dsp"), 0); - - class_addmethod(noish_class, (t_method)noish_helper, gensym("help"), 0); - class_sethelpsymbol(noish_class, gensym("zexy/noish~")); -} - - - -/* ------------------------ noisi~ ----------------------------- */ - -static t_class *noisi_class; - -static t_int *noisi_perform(t_int *w){ - t_nois *x = (t_nois *)(w[1]); - t_float *out = (t_float *)(w[2]); - int n = (int)(w[3]); - - int *vp = (int *)(&x->val); /* what the ... */ - int i_value = *vp; - t_float f_value = x->current; - t_float decrement = x->decrement; - t_float all_to_go = x->updater; - t_float still_to_go = x->to_go; - - if (all_to_go == 1) { - /* this is "pure white" noise, so we have to calculate each sample */ - while (n--) { - i_value *= 435898247; - i_value += 382842987; - *out++ = ((t_sample)((i_value & 0x7fffffff) - 0x40000000)) * (t_sample)(1.0 / 0x40000000); - } - } else if (n < still_to_go) { - /* signal won't change for the next 64 samples */ - still_to_go -= n; - while (n--){ - *out++ = (f_value -= decrement); - } - } else if (all_to_go + still_to_go > n) { - /* only one update calculation necessary for 64 samples !!! */ - while (still_to_go-- > 0) { - n--; - *out++ = (f_value -= decrement); - } - still_to_go += all_to_go + 1; - decrement = ( - (f_value = - ((t_sample)((i_value & 0x7fffffff)-0x40000000))*(t_sample)(1.0 / 0x40000000)) - - ((t_sample)(((i_value = i_value * 435898247 + 382842987) & 0x7fffffff) - - 0x40000000)) * (t_sample)(1.0 / 0x40000000) - ) / all_to_go; - - while (n--) { - still_to_go--; - *out++ = (f_value -= decrement); - } - } else { - /* anything else */ - while (n--) { - if (still_to_go-- <= 0) { /* update only if all time has elapsed */ - still_to_go += all_to_go; - decrement = ( - (f_value = ((t_sample)((i_value & 0x7fffffff) - 0x40000000)) * (t_sample)(1.0 / 0x40000000)) - - ((t_sample)(((i_value = i_value * 435898247 + 382842987) & 0x7fffffff) - 0x40000000)) * (t_sample)(1.0 / 0x40000000) - ) / all_to_go; - } - *out++ = (f_value -= decrement); - } - } - - *vp = i_value; - x->current = f_value; - x->decrement = decrement; - x->to_go = still_to_go; - - return (w+4); -} - -static void noisi_dsp(t_nois *x, t_signal **sp){ - dsp_add(noisi_perform, 3, x, sp[0]->s_vec, sp[0]->s_n); -} - - -static void noisi_helper(void){ - post("\n%c noisi~\t:: a bandlimited interpolating pseudo-noise generator", HEARTSYMBOL); - post("<freq>\t : sampling-frequency (in Hz)\n" - "'help'\t : view this"); - post("creation : \"noisi~ [<freq>]\"\t: ('0'(default) will produce 'white' noise)\n"); - post("note\t : the seed of the pseudo-noise generator changes from\n" - "\t instance to instance, so two noisi~-objects created at the\n" - "\t same time will produce different signals, something the original\n" - "\t noise~-object misses\n"); - post("for further details see DODGE/JERSE \"computer music\" c3.9\n"); -} - -static void *noisi_new(t_floatarg f){ - t_nois *x = (t_nois *)pd_new(noisi_class); - - static int init = 4259; - x->val = (init *= 17); - - set_freq (x, f); - - outlet_new(&x->x_obj, gensym("signal")); - return (x); -} - -void noisi_setup(void){ - noisi_class = class_new(gensym("noisi~"), (t_newmethod)noisi_new, 0, sizeof(t_nois), 0, A_DEFFLOAT, 0); - - class_addfloat(noisi_class, set_freq); - class_addmethod(noisi_class, (t_method)noisi_dsp, gensym("dsp"), 0); - - class_addmethod(noisi_class, (t_method)noisi_helper, gensym("help"), 0); - class_sethelpsymbol(noisi_class, gensym("zexy/noisi~")); -} - -/* global setup routine */ - -void z_noise_setup(void){ - noish_setup(); - noisi_setup(); -} |