diff options
author | musil <tmusil@users.sourceforge.net> | 2008-03-05 13:56:25 +0000 |
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committer | musil <tmusil@users.sourceforge.net> | 2008-03-05 13:56:25 +0000 |
commit | 16d6e00d809c28e3597ad1085d12809e2d0f8d89 (patch) | |
tree | ab7f9827768c9ff7088981246efec74e624018a0 /iemlib1/src/peakenv_hold~.c | |
parent | 60fcf9db02c0c555df6ca47421f709a8059a21d1 (diff) |
new peak envelope follower with peak hold time and release time and immediately attack behavior
svn path=/trunk/externals/iemlib/; revision=9533
Diffstat (limited to 'iemlib1/src/peakenv_hold~.c')
-rw-r--r-- | iemlib1/src/peakenv_hold~.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/iemlib1/src/peakenv_hold~.c b/iemlib1/src/peakenv_hold~.c new file mode 100644 index 0000000..9019527 --- /dev/null +++ b/iemlib1/src/peakenv_hold~.c @@ -0,0 +1,121 @@ +/* For information on usage and redistribution, and for a DISCLAIMER OF ALL +* WARRANTIES, see the file, "LICENSE.txt," in this distribution. + +iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2008 */ + + +#include "m_pd.h" +#include "iemlib.h" +#include <math.h> + +/* ---------------- peakenv_hold~ - simple peak-envelope-converter with peak hold time and release time. ----------------- */ + +typedef struct _peakenv_hold_tilde +{ + t_object x_obj; + t_float x_sr; + t_float x_old_peak; + t_float x_c1; + t_float x_releasetime; + t_float x_holdtime; + t_int x_n_hold; + t_int x_counter; + t_float x_msi; +} t_peakenv_hold_tilde; + +static t_class *peakenv_hold_tilde_class; + +static void peakenv_hold_tilde_reset(t_peakenv_hold_tilde *x) +{ + x->x_old_peak = 0.0f; +} + +static void peakenv_hold_tilde_ft1(t_peakenv_hold_tilde *x, t_float t_hold)/* hold-time in ms */ +{ + double dhold; + + if(t_hold < 0.0f) + t_hold = 0.0f; + x->x_holdtime = t_hold; + dhold = (double)x->x_sr*(double)0.001*(double)x->x_holdtime; + if(dhold > 2147483647.0) + dhold = 2147483647.0; + x->x_n_hold = (t_int)(dhold + (double)0.5); +} + +static void peakenv_hold_tilde_ft2(t_peakenv_hold_tilde *x, t_float t_rel)/* release-time in ms */ +{ + if(t_rel < 0.0f) + t_rel = 0.0f; + x->x_releasetime = t_rel; + x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime)); +} + +static t_int *peakenv_hold_tilde_perform(t_int *w) +{ + t_float *in = (t_float *)(w[1]); + t_float *out = (t_float *)(w[2]); + t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)(w[3]); + int n = (int)(w[4]); + t_float peak = x->x_old_peak; + t_float c1 = x->x_c1; + t_float absolute; + t_int i, counter; + + counter = x->x_counter; + for(i=0; i<n; i++) + { + absolute = fabs(*in++); + if(counter > 0) + counter--;// hold peride + else + peak *= c1;// release periode + if(absolute > peak) + { + peak = absolute; + counter = x->x_n_hold;// new hold initialisation + } + *out++ = peak; + } + /* NAN protect */ + if(IEM_DENORMAL(peak)) + peak = 0.0f; + x->x_old_peak = peak; + x->x_counter = counter; + return(w+5); +} + +static void peakenv_hold_tilde_dsp(t_peakenv_hold_tilde *x, t_signal **sp) +{ + x->x_sr = (t_float)sp[0]->s_sr; + peakenv_hold_tilde_ft1(x, x->x_holdtime); + peakenv_hold_tilde_ft2(x, x->x_releasetime); + dsp_add(peakenv_hold_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n); +} + +static void *peakenv_hold_tilde_new(t_float t_hold, t_float t_rel) +{ + t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)pd_new(peakenv_hold_tilde_class); + + x->x_sr = 44100.0f; + peakenv_hold_tilde_ft1(x, t_hold); + peakenv_hold_tilde_ft2(x, t_rel); + x->x_old_peak = 0.0f; + x->x_counter = 0; + inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1")); + inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2")); + outlet_new(&x->x_obj, &s_signal); + x->x_msi = 0; + return(x); +} + +void peakenv_hold_tilde_setup(void) +{ + peakenv_hold_tilde_class = class_new(gensym("peakenv_hold~"), (t_newmethod)peakenv_hold_tilde_new, + 0, sizeof(t_peakenv_hold_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0); + CLASS_MAINSIGNALIN(peakenv_hold_tilde_class, t_peakenv_hold_tilde, x_msi); + class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_dsp, gensym("dsp"), 0); + class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft1, gensym("ft1"), A_FLOAT, 0); + class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft2, gensym("ft2"), A_FLOAT, 0); + class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_reset, gensym("reset"), 0); +} |