tests/iodelay.cpp

   1 /*
   2     Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 // --------------------------------------------------------------------------------
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #define __STDC_LIMIT_MACROS
  24 #include <stdint.h>
  25 #include <math.h>
  26 #include <unistd.h>
  27 #include <jack/jack.h>
  28
  29 struct Freq
  30 {
  31     int   p;
  32     int   f;
  33     float xa;
  34     float ya;
  35     float x1;
  36     float y1;
  37     float x2;
  38     float y2;
  39 };
  40
  41
  42 struct MTDM
  43 {
  44     double  _del;
  45     double  _err;
  46     float   _wlp;
  47     int     _cnt;
  48     int     _inv;
  49
  50     struct Freq _freq [13];
  51 };
  52
  53
  54 struct MTDM * mtdm_new (double fsamp)
  55 {
  56     int   i;
  57     struct Freq  *F;
  58
  59     struct MTDM *retval = (MTDM *)malloc( sizeof(struct MTDM) );
  60
  61     if (retval==NULL)
  62             return NULL;
  63
  64     retval->_cnt = 0;
  65     retval->_inv = 0;
  66
  67     retval->_freq [0].f  = 4096;
  68     retval->_freq [1].f  = 2048;
  69     retval->_freq [2].f  = 3072;
  70     retval->_freq [3].f  = 2560;
  71     retval->_freq [4].f  = 2304;
  72     retval->_freq [5].f  = 2176;
  73     retval->_freq [6].f  = 1088;
  74     retval->_freq [7].f  = 1312;
  75     retval->_freq [8].f  = 1552;
  76     retval->_freq [9].f  = 1800;
  77     retval->_freq [10].f = 3332;
  78     retval->_freq [11].f = 3586;
  79     retval->_freq [12].f = 3841;
  80     retval->_wlp = 200.0f / fsamp;
  81     for (i = 0, F = retval->_freq; i < 13; i++, F++) {
  82         F->p = 128;
  83         F->xa = F->ya = 0.0f;
  84         F->x1 = F->y1 = 0.0f;
  85         F->x2 = F->y2 = 0.0f;
  86     }
  87
  88     return retval;
  89 }
  90
  91 int mtdm_process (struct MTDM *self, size_t len, float *ip, float *op)
  92 {
  93     int    i;
  94     float  vip, vop, a, c, s;
  95     struct Freq   *F;
  96
  97     while (len--)
  98     {
  99         vop = 0.0f;
 100         vip = *ip++;
 101         for (i = 0, F = self->_freq; i < 13; i++, F++)
 102         {
 103             a = 2 * (float) M_PI * (F->p & 65535) / 65536.0;
 104             F->p += F->f;
 105             c =  cosf (a);
 106             s = -sinf (a);
 107             vop += (i ? 0.01f : 0.20f) * s;
 108             F->xa += s * vip;
 109             F->ya += c * vip;
 110         }
 111         *op++ = vop;
 112         if (++self->_cnt == 16)
 113         {
 114             for (i = 0, F = self->_freq; i < 13; i++, F++)
 115             {
 116                 F->x1 += self->_wlp * (F->xa - F->x1 + 1e-20);
 117                 F->y1 += self->_wlp * (F->ya - F->y1 + 1e-20);
 118                 F->x2 += self->_wlp * (F->x1 - F->x2 + 1e-20);
 119                 F->y2 += self->_wlp * (F->y1 - F->y2 + 1e-20);
 120                 F->xa = F->ya = 0.0f;
 121             }
 122             self->_cnt = 0;
 123         }
 124     }
 125
 126     return 0;
 127 }
 128
 129 int mtdm_resolve (struct MTDM *self)
 130 {
 131     int     i, k, m;
 132     double  d, e, f0, p;
 133     struct Freq *F = self->_freq;
 134
 135     if (hypot (F->x2, F->y2) < 0.001) return -1;
 136     d = atan2 (F->y2, F->x2) / (2 * M_PI);
 137     if (self->_inv) d += 0.5;
 138     if (d > 0.5) d -= 1.0;
 139     f0 = self->_freq [0].f;
 140     m = 1;
 141     self->_err = 0.0;
 142     for (i = 0; i < 12; i++)
 143     {
 144         F++;
 145         p = atan2 (F->y2, F->x2) / (2 * M_PI) - d * F->f / f0;
 146         if (self->_inv) p += 0.5;
 147         p -= floor (p);
 148         p *= 2;
 149         k = (int)(floor (p + 0.5));
 150         e = fabs (p - k);
 151         if (e > self->_err) self->_err = e;
 152         if (e > 0.4) return 1;
 153         d += m * (k & 1);
 154         m *= 2;
 155     }
 156     self->_del = 16 * d;
 157
 158     return 0;
 159 }
 160
 161 void mtdm_invert (struct MTDM *self)
 162 {
 163         self->_inv ^= 1;
 164 }
 165 // --------------------------------------------------------------------------------
 166
 167 static struct MTDM    *mtdm;
 168 static jack_client_t  *jack_handle;
 169 static jack_port_t    *jack_capt;
 170 static jack_port_t    *jack_play;
 171
 172 jack_latency_range_t   capture_latency = {UINT32_MAX, UINT32_MAX};
 173 jack_latency_range_t   playback_latency = {UINT32_MAX, UINT32_MAX};
 174
 175 void
 176 latency_cb (jack_latency_callback_mode_t mode, void *arg)
 177 {
 178         jack_latency_range_t range;
 179
 180         range.min = range.max = 0;
 181
 182         if (mode == JackCaptureLatency) {
 183                 jack_port_set_latency_range (jack_play, mode, &range);
 184                 jack_port_get_latency_range (jack_capt, mode, &range);
 185                 if ((range.min != capture_latency.min) || (range.max != capture_latency.max)) {
 186                         capture_latency = range;
 187                         printf ("new capture latency: [%d, %d]\n", range.min, range.max);
 188                 }
 189         } else {
 190                 jack_port_set_latency_range (jack_capt, mode, &range);
 191                 jack_port_get_latency_range (jack_play, mode, &range);
 192                 if ((range.min != playback_latency.min) || (range.max != playback_latency.max)) {
 193                         playback_latency = range;
 194                         printf ("new playback latency: [%d, %d]\n", range.min, range.max);
 195                 }
 196         }
 197
 198 }
 199
 200 int jack_callback (jack_nframes_t nframes, void *arg)
 201 {
 202     float *ip, *op;
 203
 204     ip = (float *)(jack_port_get_buffer (jack_capt, nframes));
 205     op = (float *)(jack_port_get_buffer (jack_play, nframes));
 206     mtdm_process (mtdm, nframes, ip, op);
 207     return 0;
 208 }
 209
 210 int main (int ac, char *av [])
 211 {
 212     float          t;
 213     jack_status_t  s;
 214
 215     jack_handle = jack_client_open ("jack_delay", JackNoStartServer, &s);
 216     if (jack_handle == 0)
 217     {
 218         fprintf (stderr, "Can't connect to Jack, is the server running ?\n");
 219         exit (1);
 220     }
 221
 222     mtdm = mtdm_new(jack_get_sample_rate(jack_handle));
 223
 224     jack_set_process_callback (jack_handle, jack_callback, 0);
 225
 226     if (jack_set_latency_callback)
 227             jack_set_latency_callback (jack_handle, latency_cb, 0);
 228
 229     jack_capt = jack_port_register (jack_handle, "in",  JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
 230     jack_play = jack_port_register (jack_handle, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
 231
 232     t = 1000.0f / jack_get_sample_rate (jack_handle);
 233
 234     if (jack_activate (jack_handle))
 235     {
 236         fprintf(stderr, "Can't activate Jack");
 237         return 1;
 238     }
 239
 240     while (1)
 241     {
 242
 243     #ifdef WIN32
 244         Sleep (250);
 245     #else
 246         usleep (250000);
 247         #endif
 248         if (mtdm_resolve (mtdm) < 0) printf ("Signal below threshold...\n");
 249         else
 250         {
 251             jack_nframes_t systemic_latency;
 252
 253             if (mtdm->_err > 0.3)
 254             {
 255                 mtdm_invert ( mtdm );
 256                 mtdm_resolve ( mtdm );
 257             }
 258             systemic_latency = (jack_nframes_t) floor (mtdm->_del - (capture_latency.max + playback_latency.max));
 259
 260             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,
 261                     systemic_latency, systemic_latency/2);
 262             if (mtdm->_err > 0.2) printf (" ??");
 263                 if (mtdm->_inv) printf (" Inv");
 264             printf ("\n");
 265         }
 266     }
 267
 268     return 0;
 269 }
 270
 271 // --------------------------------------------------------------------------------