66cc643402
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26551 a1c6a512-1295-4272-9138-f99709370657
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
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#include "../src/m_pd.h"
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#include "../src/m_fixed.h"
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#include "cos_table.h"
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/* ------------------------ osc~ ----------------------------- */
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#ifdef ROCKBOX
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static t_class *osc_class;
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#else
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static t_class *osc_class, *scalarosc_class;
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#endif
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typedef struct _osc
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{
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t_object x_obj;
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unsigned int x_phase;
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t_sample x_conv;
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t_sample x_f; /* frequency if scalar */
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} t_osc;
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static void *osc_new(t_floatarg f)
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{
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t_osc *x = (t_osc *)pd_new(osc_class);
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x->x_f = ftofix(f);
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outlet_new(&x->x_obj, gensym("signal"));
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inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
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x->x_phase = 0;
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x->x_conv = 0;
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return (x);
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}
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static t_int *osc_perform(t_int *w)
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{
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t_osc *x = (t_osc *)(w[1]);
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t_sample *in = (t_sample *)(w[2]);
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t_sample *out = (t_sample *)(w[3]);
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int n = (int)(w[4]);
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t_sample *tab = cos_table;
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unsigned int phase = x->x_phase;
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int conv = x->x_conv;
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int off;
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int frac;
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while (n--) {
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phase+= mult(conv ,(*in++));
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phase &= (itofix(1) -1);
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off = fixtoi((long long)phase<<ILOGCOSTABSIZE);
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#ifdef NO_INTERPOLATION
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*out = *(tab+off);
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#else
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// frac = phase & (itofix(1)-1);
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frac = phase & ((1<<ILOGCOSTABSIZE)-1);
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frac <<= (fix1-ILOGCOSTABSIZE);
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*out = mult(*(tab + off),(itofix(1) - frac)) +
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mult(*(tab + off + 1),frac);
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#endif
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out++;
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}
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x->x_phase = phase;
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return (w+5);
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}
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static void osc_dsp(t_osc *x, t_signal **sp)
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{
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post("samplerate %f",sp[0]->s_sr);
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x->x_conv = ftofix(1000.)/sp[0]->s_sr;
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post("conf %d",x->x_conv);
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x->x_conv = mult(x->x_conv + 500,ftofix(0.001));
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post("conf %d",x->x_conv);
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dsp_add(osc_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
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}
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static void osc_ft1(t_osc *x, t_float f)
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{
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x->x_phase = ftofix(f); /* *2 ??? */
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}
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void osc_tilde_setup(void)
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{
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osc_class = class_new(gensym("osc~"), (t_newmethod)osc_new, 0,
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sizeof(t_osc), 0, A_DEFFLOAT, 0);
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CLASS_MAINSIGNALIN(osc_class, t_osc, x_f);
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class_addmethod(osc_class, (t_method)osc_dsp, gensym("dsp"), 0);
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class_addmethod(osc_class, (t_method)osc_ft1, gensym("ft1"), A_FLOAT, 0);
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}
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