From faada59567f8cb252f4a909116595ce309ff5828 Mon Sep 17 00:00:00 2001 From: "N.N." Date: Fri, 23 May 2003 12:29:55 +0000 Subject: This commit was generated by cvs2svn to compensate for changes in r647, which included commits to RCS files with non-trunk default branches. svn path=/trunk/externals/miXed/; revision=648 --- cyclone/sickle/log.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 cyclone/sickle/log.c (limited to 'cyclone/sickle/log.c') diff --git a/cyclone/sickle/log.c b/cyclone/sickle/log.c new file mode 100644 index 0000000..74e3e40 --- /dev/null +++ b/cyclone/sickle/log.c @@ -0,0 +1,74 @@ +/* Copyright (c) 2002-2003 krzYszcz and others. + * For information on usage and redistribution, and for a DISCLAIMER OF ALL + * WARRANTIES, see the file, "LICENSE.txt," in this distribution. */ + +#include +#include "m_pd.h" +#include "sickle/sic.h" + +#if defined(NT) || defined(MACOSX) +/* cf pd/src/x_arithmetic.c */ +#define logf log +#endif + +#define LOG_MININPUT 1e-10 /* CHECKED */ + +typedef struct _log +{ + t_sic x_sic; + t_float x_rcplogbase; /* LATER consider using double (and log()) */ +} t_log; + +static t_class *log_class; + +static void log_ft1(t_log *x, t_floatarg f) +{ + x->x_rcplogbase = (f == 0. ? 1. : /* CHECKED no protection against NaNs */ + (f == 1. ? 0. : /* CHECKED */ + 1. / logf(f))); +} + +static t_int *log_perform(t_int *w) +{ + int nblock = (int)(w[1]); + t_float *in = (t_float *)(w[2]); + t_float *out = (t_float *)(w[3]); + t_float rcplogbase = *(t_float *)(w[4]); + if (rcplogbase != 0.) + { + while (nblock--) + { + float f = *in++; + if (f < LOG_MININPUT) + f = LOG_MININPUT; /* CHECKED */ + *out++ = logf(f) * rcplogbase; + } + } + else while (nblock--) *out++ = 0.; + return (w + 5); +} + +static void log_dsp(t_log *x, t_signal **sp) +{ + dsp_add(log_perform, 4, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec, + &x->x_rcplogbase); +} + +static void *log_new(t_floatarg f) +{ + t_log *x = (t_log *)pd_new(log_class); + inlet_new((t_object *)x, (t_pd *)x, &s_float, gensym("ft1")); + outlet_new((t_object *)x, &s_signal); + log_ft1(x, f); + return (x); +} + +void log_tilde_setup(void) +{ + log_class = class_new(gensym("log~"), + (t_newmethod)log_new, 0, + sizeof(t_log), 0, A_DEFFLOAT, 0); + sic_setup(log_class, log_dsp, SIC_FLOATTOSIGNAL); + class_addmethod(log_class, (t_method)log_ft1, + gensym("ft1"), A_FLOAT, 0); +} -- cgit v1.2.1