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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 <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <jack/jack.h>
class Freq
{
public:
int p;
int f;
float a;
float xa;
float ya;
float xf;
float yf;
};
class MTDM
{
public:
MTDM (void);
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; }
double _del;
double _err;
int _cnt;
int _inv;
Freq _freq [5];
};
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 (void)
{
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;
}
// --------------------------------------------------------------------------------
static MTDM mtdm;
static jack_client_t *jack_handle;
static jack_port_t *jack_capt;
static jack_port_t *jack_play;
jack_latency_range_t capture_latency = {-1, -1};
jack_latency_range_t playback_latency = {-1, -1};
void
latency_cb (jack_latency_callback_mode_t mode, void *arg)
{
jack_latency_range_t range;
range.min = range.max = 0;
if (mode == JackCaptureLatency) {
jack_port_set_latency_range (jack_play, mode, &range);
jack_port_get_latency_range (jack_capt, mode, &range);
if ((range.min != capture_latency.min) || (range.max != capture_latency.max)) {
capture_latency = range;
printf ("new capture latency: [%d, %d]\n", range.min, range.max);
}
} else {
jack_port_set_latency_range (jack_capt, mode, &range);
jack_port_get_latency_range (jack_play, mode, &range);
if ((range.min != playback_latency.min) || (range.max != playback_latency.max)) {
playback_latency = range;
printf ("new playback latency: [%d, %d]\n", range.min, range.max);
}
}
}
int jack_callback (jack_nframes_t nframes, void *arg)
{
float *ip, *op;
ip = (float *)(jack_port_get_buffer (jack_capt, nframes));
op = (float *)(jack_port_get_buffer (jack_play, nframes));
mtdm.process (nframes, ip, op);
return 0;
}
int main (int ac, char *av [])
{
float t;
jack_status_t s;
jack_handle = jack_client_open ("jack_delay", JackNoStartServer, &s);
if (jack_handle == 0)
{
fprintf (stderr, "Can't connect to Jack, is the server running ?\n");
exit (1);
}
jack_set_process_callback (jack_handle, jack_callback, 0);
if (jack_set_latency_callback)
jack_set_latency_callback (jack_handle, latency_cb, 0);
jack_capt = jack_port_register (jack_handle, "in", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
jack_play = jack_port_register (jack_handle, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
t = 1000.0f / jack_get_sample_rate (jack_handle);
if (jack_activate (jack_handle))
{
fprintf(stderr, "Can't activate Jack");
return 1;
}
while (1)
{
#ifdef WIN32
Sleep (250);
#else
usleep (250000);
#endif
if (mtdm.resolve() < 0) printf ("Signal below threshold...\n");
else
{
jack_nframes_t systemic_latency;
if (mtdm.err () > 0.3)
{
mtdm.invert ();
mtdm.resolve ();
}
systemic_latency = (jack_nframes_t) floor (mtdm._del - (capture_latency.max + playback_latency.max));
printf("%10.3lf frames %10.3lf ms total roundtrip latency\n\textra loopback latency: %u frames\n\tuse %u for the backend arguments -I and -O"
, mtdm._del, mtdm._del * t,
systemic_latency, systemic_latency/2);
if (mtdm._err > 0.2) printf (" ??");
if (mtdm._inv) printf (" Inv");
printf ("\n");
}
}
return 0;
}
// --------------------------------------------------------------------------------
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