diff options
Diffstat (limited to 'src/iemlib1/sigrvu.c')
| -rw-r--r-- | src/iemlib1/sigrvu.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/iemlib1/sigrvu.c b/src/iemlib1/sigrvu.c new file mode 100644 index 0000000..70b9cd7 --- /dev/null +++ b/src/iemlib1/sigrvu.c @@ -0,0 +1,187 @@ +/* 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> + +/* ---------------- rvu~ - simple peak&rms-vu-meter. ----------------- */ + +typedef struct sigrvu +{ + t_object x_obj; + void *x_clock_metro; + int x_metro_time; + float x_sum_rms; + float x_old_rms; + float x_rcp; + float x_sr; + float x_release_time; + float x_c1; + int x_started; + float x_msi; +} t_sigrvu; + +t_class *sigrvu_class; +static void sigrvu_tick_metro(t_sigrvu *x); + +static void sigrvu_reset(t_sigrvu *x) +{ + outlet_float(x->x_obj.ob_outlet, -99.9f); + x->x_sum_rms = 0.0f; + x->x_old_rms = 0.0f; + clock_delay(x->x_clock_metro, x->x_metro_time); +} + +static void sigrvu_stop(t_sigrvu *x) +{ + clock_unset(x->x_clock_metro); + x->x_started = 0; +} + +static void sigrvu_start(t_sigrvu *x) +{ + clock_delay(x->x_clock_metro, x->x_metro_time); + x->x_started = 1; +} + +static void sigrvu_float(t_sigrvu *x, t_floatarg f) +{ + if(f == 0.0) + { + clock_unset(x->x_clock_metro); + x->x_started = 0; + } + else + { + clock_delay(x->x_clock_metro, x->x_metro_time); + x->x_started = 1; + } +} + +static void sigrvu_t_release(t_sigrvu *x, t_floatarg release_time) +{ + if(release_time <= 20.0f) + release_time = 20.0f; + x->x_release_time = release_time; + x->x_c1 = exp(-2.0*(float)x->x_metro_time/x->x_release_time); +} + +static void sigrvu_t_metro(t_sigrvu *x, t_floatarg metro_time) +{ + if(metro_time <= 20.0f) + metro_time = 20.0f; + x->x_metro_time = (int)metro_time; + x->x_c1 = exp(-2.0*(float)x->x_metro_time/x->x_release_time); + x->x_rcp = 1.0f/(x->x_sr*(float)x->x_metro_time); +} + +static t_int *sigrvu_perform(t_int *w) +{ + float *in = (float *)(w[1]); + t_sigrvu *x = (t_sigrvu *)(w[2]); + int n = (int)(w[3]); + float pow, sum=x->x_sum_rms; + int i; + + if(x->x_started) + { + for(i=0; i<n; i++) + { + sum += in[i]*in[i]; + } + x->x_sum_rms = sum; + } + return(w+4); +} + +static void sigrvu_dsp(t_sigrvu *x, t_signal **sp) +{ + x->x_sr = 0.001*(float)sp[0]->s_sr; + x->x_rcp = 1.0f/(x->x_sr*(float)x->x_metro_time); + dsp_add(sigrvu_perform, 3, sp[0]->s_vec, x, sp[0]->s_n); + clock_delay(x->x_clock_metro, x->x_metro_time); +} + +static void sigrvu_tick_metro(t_sigrvu *x) +{ + float dbr, cur_rms, c1=x->x_c1; + + cur_rms = (1.0f - c1)*x->x_sum_rms*x->x_rcp + c1*x->x_old_rms; + /* NAN protect */ + if(PD_BADFLOAT(cur_rms)) + cur_rms = 0.0f; + + if(cur_rms <= 0.0000000001f) + dbr = -99.9f; + else if(cur_rms > 1000000.0f) + { + dbr = 60.0f; + x->x_old_rms = 1000000.0f; + } + else + dbr = 4.3429448195f*log(cur_rms); + x->x_sum_rms = 0.0f; + x->x_old_rms = cur_rms; + outlet_float(x->x_obj.ob_outlet, dbr); + clock_delay(x->x_clock_metro, x->x_metro_time); +} + +static void sigrvu_ff(t_sigrvu *x) +{ + clock_free(x->x_clock_metro); +} + +static void *sigrvu_new(t_floatarg metro_time, t_floatarg release_time) +{ + t_sigrvu *x=(t_sigrvu *)pd_new(sigrvu_class); + float t; + int i; + + if(metro_time <= 0.0f) + metro_time = 300.0f; + if(metro_time <= 20.0f) + metro_time = 20.0f; + if(release_time <= 0.0f) + release_time = 300.0f; + if(release_time <= 20.0f) + release_time = 20.0f; + x->x_metro_time = (int)metro_time; + x->x_release_time = release_time; + x->x_c1 = exp(-2.0*(float)x->x_metro_time/x->x_release_time); + x->x_sum_rms = 0.0f; + x->x_old_rms = 0.0f; + x->x_sr = 44.1f; + x->x_rcp = 1.0f/(x->x_sr*(float)x->x_metro_time); + x->x_clock_metro = clock_new(x, (t_method)sigrvu_tick_metro); + x->x_started = 1; + outlet_new(&x->x_obj, &s_float); + x->x_msi = 0.0f; + return(x); +} + +void sigrvu_setup(void) +{ + sigrvu_class = class_new(gensym("rvu~"), (t_newmethod)sigrvu_new, + (t_method)sigrvu_ff, sizeof(t_sigrvu), 0, + A_DEFFLOAT, A_DEFFLOAT, 0); + CLASS_MAINSIGNALIN(sigrvu_class, t_sigrvu, x_msi); + class_addmethod(sigrvu_class, (t_method)sigrvu_dsp, gensym("dsp"), 0); + class_addfloat(sigrvu_class, sigrvu_float); + class_addmethod(sigrvu_class, (t_method)sigrvu_reset, gensym("reset"), 0); + class_addmethod(sigrvu_class, (t_method)sigrvu_start, gensym("start"), 0); + class_addmethod(sigrvu_class, (t_method)sigrvu_stop, gensym("stop"), 0); + class_addmethod(sigrvu_class, (t_method)sigrvu_t_release, gensym("t_release"), A_FLOAT, 0); + class_addmethod(sigrvu_class, (t_method)sigrvu_t_metro, gensym("t_metro"), A_FLOAT, 0); + class_sethelpsymbol(sigrvu_class, gensym("iemhelp/help-rvu~")); +} |