From f9e3fe480e7e3c448a626d508f1976f4fec2f759 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Tue, 9 Feb 2010 21:05:37 +0000 Subject: convert file layout to libdir style and setup everything with the new template Makefile+debian stuff svn path=/trunk/externals/sigpack/; revision=13153 --- source/freqshift~.c | 197 ---------------------------------------------------- 1 file changed, 197 deletions(-) delete mode 100644 source/freqshift~.c (limited to 'source/freqshift~.c') diff --git a/source/freqshift~.c b/source/freqshift~.c deleted file mode 100644 index 026e4cb..0000000 --- a/source/freqshift~.c +++ /dev/null @@ -1,197 +0,0 @@ -/* sIgpAck - * for - * pure-data - * www.weiss-archiv.de */ - -#include "m_pd.h" -#include -#ifdef _MSC_VER -#pragma warning( disable : 4244 ) -#pragma warning( disable : 4305 ) -#define M_PI 3.14159265358979323846 -#endif - -/* ------------------------ freqshift~ ----------------------------- */ -/* frequency shifter */ -/* code from swh_plugins by steve harris www.plugins.org.uk */ - -#define SIN_T_SIZE 64 -#define D_SIZE 256 -#define NZEROS 200 - -static t_class *freqshift_tilde_class; - -typedef struct _freqshift_tilde -{ - t_object x_obj; - t_float x_shift;//[0 - 5000] - float *x_delay; - unsigned int x_dptr; - t_float x_fs; - t_float x_last_shift; - t_float x_phi; - float *x_sint; - float x_f; -} t_freqshift_tilde; - -static void *freqshift_tilde_new(t_floatarg shift) -{ - unsigned int i; - - t_freqshift_tilde *x = (t_freqshift_tilde *)pd_new(freqshift_tilde_class); - //x->x_shift = shift; - outlet_new(&x->x_obj, gensym("signal")); - outlet_new(&x->x_obj, gensym("signal")); - floatinlet_new(&x->x_obj, &x->x_shift); - x->x_fs = sys_getsr(); - x->x_delay = (float *)getbytes(D_SIZE * sizeof(float)); - x->x_sint = (float *)getbytes(SIN_T_SIZE * sizeof(float)); - x->x_dptr = 0; - x->x_phi = 0.0f; - x->x_last_shift = 0.0f; - x->x_f = 0; - for (i = 0; i < SIN_T_SIZE; i++) { - x->x_sint[i] = sin(2.0f * M_PI * (float)i / (float)SIN_T_SIZE); - } - if (shift) x->x_shift = shift; - else x->x_shift = 0; - return (x); -} - -/* The non-zero taps of the Hilbert transformer */ -static float xcoeffs[] = { - +0.0008103736f, +0.0008457886f, +0.0009017196f, +0.0009793364f, - +0.0010798341f, +0.0012044365f, +0.0013544008f, +0.0015310235f, - +0.0017356466f, +0.0019696659f, +0.0022345404f, +0.0025318040f, - +0.0028630784f, +0.0032300896f, +0.0036346867f, +0.0040788644f, - +0.0045647903f, +0.0050948365f, +0.0056716186f, +0.0062980419f, - +0.0069773575f, +0.0077132300f, +0.0085098208f, +0.0093718901f, - +0.0103049226f, +0.0113152847f, +0.0124104218f, +0.0135991079f, - +0.0148917649f, +0.0163008758f, +0.0178415242f, +0.0195321089f, - +0.0213953037f, +0.0234593652f, +0.0257599469f, +0.0283426636f, - +0.0312667947f, +0.0346107648f, +0.0384804823f, +0.0430224431f, - +0.0484451086f, +0.0550553725f, +0.0633242001f, +0.0740128560f, - +0.0884368322f, +0.1090816773f, +0.1412745301f, +0.1988673273f, - +0.3326528346f, +0.9997730178f, -0.9997730178f, -0.3326528346f, - -0.1988673273f, -0.1412745301f, -0.1090816773f, -0.0884368322f, - -0.0740128560f, -0.0633242001f, -0.0550553725f, -0.0484451086f, - -0.0430224431f, -0.0384804823f, -0.0346107648f, -0.0312667947f, - -0.0283426636f, -0.0257599469f, -0.0234593652f, -0.0213953037f, - -0.0195321089f, -0.0178415242f, -0.0163008758f, -0.0148917649f, - -0.0135991079f, -0.0124104218f, -0.0113152847f, -0.0103049226f, - -0.0093718901f, -0.0085098208f, -0.0077132300f, -0.0069773575f, - -0.0062980419f, -0.0056716186f, -0.0050948365f, -0.0045647903f, - -0.0040788644f, -0.0036346867f, -0.0032300896f, -0.0028630784f, - -0.0025318040f, -0.0022345404f, -0.0019696659f, -0.0017356466f, - -0.0015310235f, -0.0013544008f, -0.0012044365f, -0.0010798341f, - -0.0009793364f, -0.0009017196f, -0.0008457886f, -0.0008103736f, -}; - -static float f_clamp(float x, float a, float b) -{ - const float x1 = fabs(x - a); - const float x2 = fabs(x - b); - - x = x1 + a + b; - x -= x2; - x *= 0.5; - - return x; -} - -// Round float to int using IEEE int* hack -static int f_round(float f) { - f += (3<<22); - return *((int*)&f) - 0x4b400000; -} - -// Cubic interpolation function -static float cube_interp(const float fr, const float inm1, const float - in, const float inp1, const float inp2) -{ - return in + 0.5f * fr * (inp1 - inm1 + - fr * (4.0f * inp1 + 2.0f * inm1 - 5.0f * in - inp2 + - fr * (3.0f * (in - inp1) - inm1 + inp2))); -} - -static t_int *freqshift_tilde_perform(t_int *w) -{ - t_freqshift_tilde *x = (t_freqshift_tilde *)(w[1]); - t_float *in = (t_float *)(w[2]); - t_float *out1 = (t_float *)(w[3]); - t_float *out2 = (t_float *)(w[4]); - int n = (int)(w[5]); - float f, hilb, rm1, rm2, frac_p; - float shift_i = x->x_last_shift; - float sample_count = sys_getblksize(); - unsigned int i; - int int_p; - const float shift_c = f_clamp(x->x_shift, 0.0f, 10000.0f); - const float shift_inc = (shift_c - x->x_last_shift) / (float)sample_count; - const float freq_fix = (float)SIN_T_SIZE / x->x_fs; - while (n--) - { - f = *in++; - x->x_delay[x->x_dptr] = f; - /* Perform the Hilbert FIR convolution - * (probably FFT would be faster) */ - hilb = 0.0f; - for (i = 0; i <= NZEROS/2; i++) { - hilb += (xcoeffs[i] * x->x_delay[(x->x_dptr - i*2) & (D_SIZE - 1)]); - } - - /* Calcuate the table positions for the sine modulator */ - int_p = f_round(floor(x->x_phi)); - - /* Calculate ringmod1, the transformed input modulated with a shift Hz - * sinewave. This creates a +180 degree sideband at source-shift Hz and - * a 0 degree sindeband at source+shift Hz */ - frac_p = x->x_phi - int_p; - rm1 = hilb * cube_interp(frac_p, x->x_sint[int_p], x->x_sint[int_p+1], - x->x_sint[int_p+2], x->x_sint[int_p+3]); - - /* Calcuate the table positions for the cosine modulator */ - int_p = (int_p + SIN_T_SIZE / 4) & (SIN_T_SIZE - 1); - - /* Calculate ringmod2, the delayed input modulated with a shift Hz - * cosinewave. This creates a 0 degree sideband at source+shift Hz - * and a -180 degree sindeband at source-shift Hz */ - rm2 = x->x_delay[(x->x_dptr - 100) & (D_SIZE - 1)] * cube_interp(frac_p, - x->x_sint[int_p], x->x_sint[int_p+1], x->x_sint[int_p+2], x->x_sint[int_p+3]); - - /* Output the sum and differences of the ringmods. The +/-180 degree - * sidebands cancel (more of less) and just leave the shifted - * components */ - *out1++ = (rm2 - rm1) * 0.5f; /*downshifting*/ - *out2++ = (rm2 + rm1) * 0.5f; /*upshifting*/ - - x->x_dptr = (x->x_dptr + 1) & (D_SIZE - 1); - x->x_phi += shift_i * freq_fix; - while (x->x_phi > SIN_T_SIZE) { - x->x_phi -= SIN_T_SIZE; - } - shift_i += shift_inc; - } - return (w+6); -} - -static void freqshift_tilde_dsp(t_freqshift_tilde *x, t_signal **sp) -{ - dsp_add(freqshift_tilde_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n); -} - -static void freqshift_tilde_free(t_freqshift_tilde *x) -{ - if(x->x_delay) - freebytes(x->x_delay, D_SIZE * sizeof(float)); - if(x->x_sint) - freebytes(x->x_sint, SIN_T_SIZE + 4 * sizeof(float)); -} - -void freqshift_tilde_setup(void) -{ - freqshift_tilde_class = class_new(gensym("freqshift~"), (t_newmethod)freqshift_tilde_new, (t_method)freqshift_tilde_free, - sizeof(t_freqshift_tilde), 0, A_DEFFLOAT, 0); - CLASS_MAINSIGNALIN(freqshift_tilde_class, t_freqshift_tilde, x_f); - class_addmethod(freqshift_tilde_class, (t_method)freqshift_tilde_dsp, gensym("dsp"), 0); -} -- cgit v1.2.1