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add new files, derived from jack_delay by fons

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git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@5728 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2009-10-05 16:59:39 +00:00
parent 91cb4157b9
commit d31649b4b4
2 changed files with 190 additions and 0 deletions
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58
libs/ardour/ardour/mtdm.h Normal file
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/*
Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __libardour_mtdm_h__
#define __libardour_mtdm_h__
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <unistd.h>
class MTDM {
public:
MTDM ();
int process (size_t len, float *inp, float *out);
int resolve (void);
void invert (void) { _inv ^= 1; }
int inv (void) { return _inv; }
double del (void) { return _del; }
double err (void) { return _err; }
private:
class Freq {
public:
int p;
int f;
float a;
float xa;
float ya;
float xf;
float yf;
};
double _del;
double _err;
int _cnt;
int _inv;
Freq _freq [5];
};
#endif /* __libardour_mtdm_h__ */

132
libs/ardour/mtdm.cc Normal file
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/*
Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <ardour/mtdm.h>
MTDM::MTDM (void)
: _cnt (0)
, _inv (0)
{
int i;
Freq *F;
_freq [0].f = 4096;
_freq [1].f = 512;
_freq [2].f = 1088;
_freq [3].f = 1544;
_freq [4].f = 2049;
_freq [0].a = 0.2f;
_freq [1].a = 0.1f;
_freq [2].a = 0.1f;
_freq [3].a = 0.1f;
_freq [4].a = 0.1f;
for (i = 0, F = _freq; i < 5; i++, F++) {
F->p = 128;
F->xa = F->ya = 0.0f;
F->xf = F->yf = 0.0f;
}
}
int
MTDM::process (size_t len, float *ip, float *op)
{
int i;
float vip, vop, a, c, s;
Freq *F;
while (len--)
{
vop = 0.0f;
vip = *ip++;
for (i = 0, F = _freq; i < 5; i++, F++)
{
a = 2 * (float) M_PI * (F->p & 65535) / 65536.0;
F->p += F->f;
c = cosf (a);
s = -sinf (a);
vop += F->a * s;
F->xa += s * vip;
F->ya += c * vip;
}
*op++ = vop;
if (++_cnt == 16)
{
for (i = 0, F = _freq; i < 5; i++, F++)
{
F->xf += 1e-3f * (F->xa - F->xf + 1e-20);
F->yf += 1e-3f * (F->ya - F->yf + 1e-20);
F->xa = F->ya = 0.0f;
}
_cnt = 0;
}
}
return 0;
}
int
MTDM::resolve ()
{
int i, k, m;
double d, e, f0, p;
Freq *F = _freq;
if (hypot (F->xf, F->yf) < 0.01) {
return -1;
}
d = atan2 (F->yf, F->xf) / (2 * M_PI);
if (_inv) {
d += 0.5f;
}
if (d > 0.5f) {
d -= 1.0f;
}
f0 = _freq [0].f;
m = 1;
_err = 0.0;
for (i = 0; i < 4; i++) {
F++;
p = atan2 (F->yf, F->xf) / (2 * M_PI) - d * F->f / f0;
if (_inv) {
p += 0.5f;
}
p -= floor (p);
p *= 8;
k = (int)(floor (p + 0.5));
e = fabs (p - k);
if (e > _err) {
_err = e;
}
if (e > 0.4) {
return 1;
}
d += m * (k & 7);
m *= 8;
}
_del = 16 * d;
return 0;
}