diff options
author | Hans-Christoph Steiner <eighthave@users.sourceforge.net> | 2004-05-18 21:33:33 +0000 |
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committer | Hans-Christoph Steiner <eighthave@users.sourceforge.net> | 2004-05-18 21:33:33 +0000 |
commit | 577ac6e80ff4f436fbd054291ed7dddbc31bd49a (patch) | |
tree | 6ec69b216dda68d7de38a5eba1851b9d4f1431e6 /src/iemlib1/sigpeakenv.c |
This commit was generated by cvs2svn to compensate for changes in r1738,svn2git-root
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/externals/iemlib/; revision=1739
Diffstat (limited to 'src/iemlib1/sigpeakenv.c')
-rw-r--r-- | src/iemlib1/sigpeakenv.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/iemlib1/sigpeakenv.c b/src/iemlib1/sigpeakenv.c new file mode 100644 index 0000000..a16638e --- /dev/null +++ b/src/iemlib1/sigpeakenv.c @@ -0,0 +1,102 @@ +/* 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 - 2003 */ + +#ifdef NT +#pragma warning( disable : 4244 ) +#pragma warning( disable : 4305 ) +#endif + + +#include "m_pd.h" +#include "iemlib.h" +#include <math.h> +#include <stdio.h> +#include <string.h> + +/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */ + +typedef struct sigpeakenv +{ + t_object x_obj; + float x_sr; + float x_old_peak; + float x_c1; + float x_releasetime; + float x_msi; +} t_sigpeakenv; + +t_class *sigpeakenv_class; + +static void sigpeakenv_reset(t_sigpeakenv *x) +{ + x->x_old_peak = 0.0f; +} + +static void sigpeakenv_ft1(t_sigpeakenv *x, t_floatarg f)/* release-time in ms */ +{ + if(f < 0.0f) + f = 0.0f; + x->x_releasetime = f; + x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime)); +} + +static t_int *sigpeakenv_perform(t_int *w) +{ + float *in = (float *)(w[1]); + float *out = (float *)(w[2]); + t_sigpeakenv *x = (t_sigpeakenv *)(w[3]); + int n = (int)(w[4]); + float peak = x->x_old_peak; + float c1 = x->x_c1; + float absolute; + int i; + + for(i=0; i<n; i++) + { + absolute = fabs(*in++); + peak *= c1; + if(absolute > peak) + peak = absolute; + *out++ = peak; + } + /* NAN protect */ + if(PD_BADFLOAT(peak)) + peak = 0.0f; + x->x_old_peak = peak; + return(w+5); +} + +static void sigpeakenv_dsp(t_sigpeakenv *x, t_signal **sp) +{ + x->x_sr = (float)sp[0]->s_sr; + sigpeakenv_ft1(x, x->x_releasetime); + dsp_add(sigpeakenv_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n); +} + +static void *sigpeakenv_new(t_floatarg f) +{ + t_sigpeakenv *x = (t_sigpeakenv *)pd_new(sigpeakenv_class); + + if(f <= 0.0f) + f = 0.0f; + x->x_sr = 44100.0f; + sigpeakenv_ft1(x, f); + x->x_old_peak = 0.0f; + inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1")); + outlet_new(&x->x_obj, &s_signal); + x->x_msi = 0; + return(x); +} + +void sigpeakenv_setup(void) +{ + sigpeakenv_class = class_new(gensym("peakenv~"), (t_newmethod)sigpeakenv_new, + 0, sizeof(t_sigpeakenv), 0, A_DEFFLOAT, 0); + CLASS_MAINSIGNALIN(sigpeakenv_class, t_sigpeakenv, x_msi); + class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_dsp, gensym("dsp"), 0); + class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_ft1, gensym("ft1"), A_FLOAT, 0); + class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_reset, gensym("reset"), 0); + class_sethelpsymbol(sigpeakenv_class, gensym("iemhelp/help-peakenv~")); +} |