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/* Copyright 2003 Benjamin R. Saylor <bensaylor@fastmail.fm>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <fftw3.h>
#include "m_pd.h"
// FIXME:
// set array when dsp is turned on
// get rid of shiftbuf, just save values that will be needed next before overwriting them
// cubic interp
// use float fftw?
// performance testing
// what if there are 2 transients less than fftsize apart? second one might get smeared.
// compare sound with phaselockedvoc.pd
// detect transients
// peaks + noise
// other phase locking methods
// use floats?
// use in-place?
// if don't have an array, call setarray(x->arrayname)
// window size and fft size independent (what is gained by zero-padding?)
// error if parent blocksize is larger than hopsize
// slowly return window to true position after centering around a transient?
// use fewer fft arrays?
// DONE:
// use FFTW_MEASURE
static t_class *pvoc_class;
typedef struct _pvoc {
t_object x_obj;
t_symbol *arrayname;
t_garray *arrayobj;
t_word *array;
int arraysize;
double *window;
int fftsize;
int overlap;
int hopsize; // = fftsize / overlap
int trans[256]; // sample indices of transients
int ntrans; // number of transients
int wastrans; // there was a transient in the left half of the window during the previous frame
double phaselocking;
fftw_plan fftplan;
fftw_plan fft2plan;
fftw_plan ifftplan;
double *fftin;
double *fft2in;
double *ifftout;
fftw_complex *fftout;
fftw_complex *fft2out;
fftw_complex *ifftin;
fftw_complex *shiftbuf;
double *outbuf;
int outbufpos;
} t_pvoc;
// if there is a transient between samples a and b, return its position, else return -1
static inline int transient_between(t_pvoc *x, int a, int b)
{
// linear search for now: FIXME
int i;
for (i = 0; i < x->ntrans; i++)
if (a <= x->trans[i] && b >= x->trans[i])
return x->trans[i];
return -1;
}
#if 1
static inline double interpolate(t_pvoc *x, double t)
{
// linear interpolation for now: FIXME
if (t < 0 || t > (x->arraysize - 1))
return 0.0;
else {
int x_1 = t;
double y_1 = x->array[x_1].w_float;
double y_2 = x->array[x_1 + 1].w_float;
return (y_2 - y_1) * (t - x_1) + y_1;
}
}
#else
static inline double interpolate(t_pvoc *x, double t)
{
// FIXME check bounds (can't think now)
int truncphase = (int) x->phase;
double fr = x->phase - ((double) truncphase);
double inm1 = x->ifftout[truncphase - 1];
double in = x->ifftout[truncphase + 0];
double inp1 = x->ifftout[truncphase + 1];
double inp2 = x->ifftout[truncphase + 2];
// taken from swh-plugins-0.4.0/ladspa-util.h cube_interp, made to use doubles instead since doubles are what i'm using for some reason
return in + 0.5 * fr * (inp1 - inm1 +
fr * (4.0 * inp1 + 2.0 * inm1 - 5.0 * in - inp2 +
fr * (3.0 * (in - inp1) - inm1 + inp2)));
}
#endif
static t_int *pvoc_perform(t_int *w)
{
t_pvoc *x = (t_pvoc *)(w[1]);
t_float *in1 = (t_float *)(w[2]);
t_float *in2 = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
int n = (int)(w[5]);
double t;
double pitchshift;
int transientpos;
int desmear;
double framestart;
double frameend;
int i; // 0 to n -type iterator
int j; // start to end -type iterator
int k; // bin iterator
double xlook; // iterator for interpolated table lookup
// if we are at the start of a new frame...
if (x->outbufpos % x->hopsize == 0) {
// don't desmear this frame by default
desmear = 0;
// sample the input signals (FIXME just sample these in the beginning..)
t = in1[0]; // time position
pitchshift = in2[0]; // pitch shift
// set the frame boundaries with the desired time pos in the middle
framestart = t - (pitchshift * x->fftsize / 2);
frameend = framestart + pitchshift * x->fftsize;
// prepare to de-smear transients
transientpos = transient_between(x, (int) framestart, (int) frameend);
if (transientpos != -1) {
// there is a transient in this frame
#if 0
if (transientpos > t) {
// there is a transient in the right half of the window:
// --> move the window left until the transient is outside it
frameend = transientpos;
framestart = frameend - x->fftsize;
x->wastrans = 0;
} else if ( ! x->wastrans) {
// there is a transient in the left half of the window,
// and there was no transient there during the previous frame:
// --> center the window around the transient and remember to desmear this frame
framestart = transientpos - (x->fftsize / 2);
frameend = framestart + x->fftsize;
desmear = 1;
x->wastrans = 1;
} else
x->wastrans = 1;
#else
// this simpler method turns out to sound better (timing sounds more accurate, no "frozen" sound preceding transients)
if ( ! x->wastrans) {
// there is a transient in the window,
// and there wasn't during the previous frame:
// --> center the window around the transient and remember to desmear this frame
framestart = transientpos - (pitchshift * x->fftsize / 2);
desmear = 1;
}
x->wastrans = 1;
#endif
} else
x->wastrans = 0;
// interpolate-read the array from framestart to frameend into fftin, windowing it
for (i = 0, xlook = framestart; i < x->fftsize; xlook += pitchshift, i++) {
x->fftin[i] = interpolate(x, xlook) * x->window[i];
}
// hop forward and read the second frame into fft2in
// FIXME merge the two loops?
framestart += pitchshift * x->hopsize;
for (i = 0, xlook = framestart; i < x->fftsize; xlook += pitchshift, i++) {
x->fft2in[i] = interpolate(x, xlook) * x->window[i];
}
// do the ffts
fftw_execute(x->fftplan);
fftw_execute(x->fft2plan);
if ( ! desmear) {
// Miller Puckette's phase modification math (translation from 09.pvoc.pd and 10.phaselockedvoc.pd)
double a, b, r, c, d;
// propagate phase
for (k = 0; k < (x->fftsize / 2 + 1); k++) {
a = x->ifftin[k][0] * x->fftout[k][0] + x->ifftin[k][1] * x->fftout[k][1] + 0.00000000000000000001;
b = x->ifftin[k][1] * x->fftout[k][0] - x->ifftin[k][0] * x->fftout[k][1];
r = 1 / sqrt(a * a + b * b);
c = a * r;
d = b * r;
x->shiftbuf[k][0] = c * x->fft2out[k][0] - d * x->fft2out[k][1];
x->shiftbuf[k][1] = c * x->fft2out[k][1] + d * x->fft2out[k][0];
}
// don't phase-lock the first bin
x->ifftin[0][0] = x->shiftbuf[0][0];
x->ifftin[0][1] = x->shiftbuf[0][1];
// phase-lock
for (k = 1; k < (x->fftsize / 2); k++) {
x->ifftin[k][0] = x->shiftbuf[k][0] - x->phaselocking * (x->shiftbuf[k - 1][0] + x->shiftbuf[k + 1][0]);
x->ifftin[k][1] = x->shiftbuf[k][1] - x->phaselocking * (x->shiftbuf[k - 1][1] + x->shiftbuf[k + 1][1]);
}
// don't phase-lock the last bin
x->ifftin[x->fftsize / 2][0] = x->shiftbuf[x->fftsize / 2][0];
x->ifftin[x->fftsize / 2][1] = x->shiftbuf[x->fftsize / 2][1];
} else {
// this frame is to be de-smeared, which means don't modify the phases, just preserve the original phases
for (k = 0; k < (x->fftsize / 2 + 1); k++) {
x->ifftin[k][0] = x->fftout[k][0];
x->ifftin[k][1] = x->fftout[k][1];
}
}
// do the ifft
fftw_execute(x->ifftplan);
// add into output buffer, windowing and normalizing first (divide by blocksize)
for (i = 0, j = x->outbufpos; i < x->fftsize; i++, j++) {
x->outbuf[j % x->fftsize] += x->ifftout[i] / x->fftsize * x->window[i];
}
}
// output one block of the output buffer
for (i = 0, j = x->outbufpos; i < n; i++, j++) {
out[i] = x->outbuf[j % x->fftsize];
x->outbuf[j % x->fftsize] = 0; // zero the part of the buffer that was just output
}
// move the output buffer pointer forward by one block
x->outbufpos = (x->outbufpos + n) % x->fftsize;
return (w+6);
}
static void pvoc_dsp(t_pvoc *x, t_signal **sp)
{
dsp_add(pvoc_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
}
// adapted from jsarlo's windowing library
// Hanning
static void makewindow(double *w, int n)
{
int i;
double xshift = n / 2.0;
double x;
for (i = 0; i < n; i++) {
x = (i - xshift) / xshift;
w[i] = 0.5 * (1 + cos(M_PI * x));
}
}
static void setarray(t_pvoc *x, t_symbol *s)
{
x->arrayname = s;
if ( ! (x->arrayobj = (t_garray *)pd_findbyclass(x->arrayname, garray_class))) {
if (*x->arrayname->s_name) pd_error(x, "pvoc~: %s: no such array", x->arrayname->s_name);
x->array = NULL;
x->arraysize = 0;
} else if ( ! garray_getfloatwords(x->arrayobj, &x->arraysize, &x->array)) {
error("%s: bad template", x->arrayname->s_name);
x->array = NULL;
x->arraysize = 0;
} else {
garray_usedindsp(x->arrayobj);
}
}
static void locking(t_pvoc *x, t_floatarg f)
{
x->phaselocking = f;
}
// takes a list of sample positions of transients to be de-smeared
static void transients(t_pvoc *x, t_symbol *s, int argc, t_atom *argv)
{
int i;
x->ntrans = argc;
for (i = 0; i < x->ntrans; i++)
x->trans[i] = atom_getfloatarg(i, argc, argv);
}
// for clarity (same as "transients" with no args)
static void notransients(t_pvoc *x)
{
x->ntrans = 0;
}
static void *pvoc_new(t_symbol *s, int argc, t_atom *argv)
{
t_pvoc *x = (t_pvoc *)pd_new(pvoc_class);
int i;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal); // pitch-shift inlet
outlet_new(&x->x_obj, gensym("signal"));
if (argc != 3) {
post("argc = %d", argc);
error("pvoc~: usage: [pvoc~ <arrayname> <fftsize> <overlap>]");
return NULL;
}
x->fftsize = atom_getfloatarg(1, argc, argv);
x->overlap = atom_getfloatarg(2, argc, argv);
x->hopsize = x->fftsize / x->overlap;
x->ntrans = 0;
x->wastrans = 0;
x->phaselocking = 0;
// get the source array
setarray(x, atom_getsymbol(argv));
// set up output ring buffer
x->outbuf = getbytes(sizeof(double) * x->fftsize);
x->outbufpos = 0;
for (i = 0; i < x->fftsize; i++)
x->outbuf[i] = 0;
// make table for window function
x->window = getbytes(sizeof(double) * x->fftsize);
makewindow(x->window, x->fftsize);
// set up fftw stuff
x->fftin = fftw_malloc(sizeof(double) * x->fftsize);
x->fft2in = fftw_malloc(sizeof(double) * x->fftsize);
x->ifftout = fftw_malloc(sizeof(double) * x->fftsize);
x->fftout = fftw_malloc(sizeof(fftw_complex) * (x->fftsize / 2 + 1));
x->fft2out = fftw_malloc(sizeof(fftw_complex) * (x->fftsize / 2 + 1));
x->ifftin = fftw_malloc(sizeof(fftw_complex) * (x->fftsize / 2 + 1));
x->shiftbuf = fftw_malloc(sizeof(fftw_complex) * (x->fftsize / 2 + 1));
for (i = 0; i < (x->fftsize / 2 + 1); i++) {
x->ifftin[i][0] = 0; // need to start the phases from zero
x->ifftin[i][1] = 0;
}
x->fftplan = fftw_plan_dft_r2c_1d(x->fftsize, x->fftin, x->fftout, FFTW_MEASURE);
x->fft2plan = fftw_plan_dft_r2c_1d(x->fftsize, x->fft2in, x->fft2out, FFTW_MEASURE);
x->ifftplan = fftw_plan_dft_c2r_1d(x->fftsize, x->ifftin, x->ifftout, FFTW_MEASURE | FFTW_PRESERVE_INPUT);
return (x);
}
static void pvoc_free(t_pvoc *x)
{
freebytes(x->outbuf, sizeof(double) * x->fftsize);
freebytes(x->window, sizeof(double) * x->fftsize);
fftw_free(x->fftin);
fftw_free(x->fft2in);
fftw_free(x->ifftout);
fftw_free(x->fftout);
fftw_free(x->fft2out);
fftw_free(x->ifftin);
fftw_free(x->shiftbuf);
fftw_destroy_plan(x->fftplan);
fftw_destroy_plan(x->fft2plan);
fftw_destroy_plan(x->ifftplan);
}
void pvoc_tilde_setup(void)
{
pvoc_class = class_new(gensym("pvoc~"), (t_newmethod)pvoc_new, (t_method)pvoc_free, sizeof(t_pvoc), 0, A_GIMME, 0);
class_addmethod(pvoc_class, nullfn, gensym("signal"), 0);
class_addmethod(pvoc_class, (t_method) pvoc_dsp, gensym("dsp"), 0);
class_addmethod(pvoc_class, (t_method) setarray, gensym("setarray"), A_DEFSYMBOL, 0);
class_addmethod(pvoc_class, (t_method) locking, gensym("locking"), A_DEFFLOAT, 0);
class_addmethod(pvoc_class, (t_method) transients, gensym("transients"), A_GIMME, 0);
class_addmethod(pvoc_class, (t_method) notransients, gensym("notransients"), 0);
}
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