272 lines
7.1 KiB
C++
272 lines
7.1 KiB
C++
/*
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Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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// --------------------------------------------------------------------------------
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#include <stdlib.h>
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#include <stdio.h>
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#define __STDC_LIMIT_MACROS
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#include <stdint.h>
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#include <math.h>
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#include <unistd.h>
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#include <jack/jack.h>
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struct Freq
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{
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int p;
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int f;
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float xa;
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float ya;
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float x1;
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float y1;
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float x2;
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float y2;
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};
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struct MTDM
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{
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double _del;
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double _err;
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float _wlp;
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int _cnt;
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int _inv;
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struct Freq _freq [13];
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};
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struct MTDM * mtdm_new (double fsamp)
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{
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int i;
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struct Freq *F;
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struct MTDM *retval = (MTDM *)malloc( sizeof(struct MTDM) );
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if (retval==NULL)
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return NULL;
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retval->_cnt = 0;
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retval->_inv = 0;
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retval->_freq [0].f = 4096;
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retval->_freq [1].f = 2048;
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retval->_freq [2].f = 3072;
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retval->_freq [3].f = 2560;
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retval->_freq [4].f = 2304;
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retval->_freq [5].f = 2176;
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retval->_freq [6].f = 1088;
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retval->_freq [7].f = 1312;
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retval->_freq [8].f = 1552;
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retval->_freq [9].f = 1800;
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retval->_freq [10].f = 3332;
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retval->_freq [11].f = 3586;
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retval->_freq [12].f = 3841;
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retval->_wlp = 200.0f / fsamp;
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for (i = 0, F = retval->_freq; i < 13; i++, F++) {
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F->p = 128;
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F->xa = F->ya = 0.0f;
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F->x1 = F->y1 = 0.0f;
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F->x2 = F->y2 = 0.0f;
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}
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return retval;
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}
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int mtdm_process (struct MTDM *self, size_t len, float *ip, float *op)
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{
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int i;
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float vip, vop, a, c, s;
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struct Freq *F;
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while (len--)
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{
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vop = 0.0f;
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vip = *ip++;
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for (i = 0, F = self->_freq; i < 13; i++, F++)
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{
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a = 2 * (float) M_PI * (F->p & 65535) / 65536.0;
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F->p += F->f;
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c = cosf (a);
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s = -sinf (a);
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vop += (i ? 0.01f : 0.20f) * s;
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F->xa += s * vip;
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F->ya += c * vip;
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}
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*op++ = vop;
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if (++self->_cnt == 16)
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{
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for (i = 0, F = self->_freq; i < 13; i++, F++)
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{
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F->x1 += self->_wlp * (F->xa - F->x1 + 1e-20);
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F->y1 += self->_wlp * (F->ya - F->y1 + 1e-20);
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F->x2 += self->_wlp * (F->x1 - F->x2 + 1e-20);
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F->y2 += self->_wlp * (F->y1 - F->y2 + 1e-20);
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F->xa = F->ya = 0.0f;
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}
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self->_cnt = 0;
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}
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}
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return 0;
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}
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int mtdm_resolve (struct MTDM *self)
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{
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int i, k, m;
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double d, e, f0, p;
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struct Freq *F = self->_freq;
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if (hypot (F->x2, F->y2) < 0.001) return -1;
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d = atan2 (F->y2, F->x2) / (2 * M_PI);
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if (self->_inv) d += 0.5;
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if (d > 0.5) d -= 1.0;
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f0 = self->_freq [0].f;
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m = 1;
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self->_err = 0.0;
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for (i = 0; i < 12; i++)
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{
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F++;
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p = atan2 (F->y2, F->x2) / (2 * M_PI) - d * F->f / f0;
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if (self->_inv) p += 0.5;
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p -= floor (p);
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p *= 2;
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k = (int)(floor (p + 0.5));
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e = fabs (p - k);
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if (e > self->_err) self->_err = e;
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if (e > 0.4) return 1;
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d += m * (k & 1);
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m *= 2;
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}
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self->_del = 16 * d;
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return 0;
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}
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void mtdm_invert (struct MTDM *self)
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{
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self->_inv ^= 1;
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}
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// --------------------------------------------------------------------------------
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static struct MTDM *mtdm;
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static jack_client_t *jack_handle;
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static jack_port_t *jack_capt;
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static jack_port_t *jack_play;
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jack_latency_range_t capture_latency = {UINT32_MAX, UINT32_MAX};
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jack_latency_range_t playback_latency = {UINT32_MAX, UINT32_MAX};
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void
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latency_cb (jack_latency_callback_mode_t mode, void *arg)
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{
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jack_latency_range_t range;
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range.min = range.max = 0;
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if (mode == JackCaptureLatency) {
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jack_port_set_latency_range (jack_play, mode, &range);
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jack_port_get_latency_range (jack_capt, mode, &range);
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if ((range.min != capture_latency.min) || (range.max != capture_latency.max)) {
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capture_latency = range;
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printf ("new capture latency: [%d, %d]\n", range.min, range.max);
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}
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} else {
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jack_port_set_latency_range (jack_capt, mode, &range);
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jack_port_get_latency_range (jack_play, mode, &range);
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if ((range.min != playback_latency.min) || (range.max != playback_latency.max)) {
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playback_latency = range;
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printf ("new playback latency: [%d, %d]\n", range.min, range.max);
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}
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}
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}
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int jack_callback (jack_nframes_t nframes, void *arg)
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{
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float *ip, *op;
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ip = (float *)(jack_port_get_buffer (jack_capt, nframes));
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op = (float *)(jack_port_get_buffer (jack_play, nframes));
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mtdm_process (mtdm, nframes, ip, op);
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return 0;
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}
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int main (int ac, char *av [])
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{
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float t;
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jack_status_t s;
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jack_handle = jack_client_open ("jack_delay", JackNoStartServer, &s);
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if (jack_handle == 0)
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{
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fprintf (stderr, "Can't connect to Jack, is the server running ?\n");
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exit (1);
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}
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mtdm = mtdm_new(jack_get_sample_rate(jack_handle));
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jack_set_process_callback (jack_handle, jack_callback, 0);
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if (jack_set_latency_callback)
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jack_set_latency_callback (jack_handle, latency_cb, 0);
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jack_capt = jack_port_register (jack_handle, "in", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
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jack_play = jack_port_register (jack_handle, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
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t = 1000.0f / jack_get_sample_rate (jack_handle);
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if (jack_activate (jack_handle))
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{
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fprintf(stderr, "Can't activate Jack");
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return 1;
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}
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while (1)
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{
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#ifdef WIN32
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Sleep (250);
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#else
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usleep (250000);
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#endif
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if (mtdm_resolve (mtdm) < 0) printf ("Signal below threshold...\n");
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else
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{
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jack_nframes_t systemic_latency;
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if (mtdm->_err > 0.3)
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{
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mtdm_invert ( mtdm );
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mtdm_resolve ( mtdm );
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}
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systemic_latency = (jack_nframes_t) floor (mtdm->_del - (capture_latency.max + playback_latency.max));
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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,
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systemic_latency, systemic_latency/2);
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if (mtdm->_err > 0.2) printf (" ??");
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if (mtdm->_inv) printf (" Inv");
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printf ("\n");
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}
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}
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return 0;
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}
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// --------------------------------------------------------------------------------
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