tests/jdelay.cpp

   1 /*
   2     Copyright (C) 2003 Fons Adriaensen <fons.adriaensen@skynet.be>
   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
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <math.h>
  26 #ifdef WIN32
  27         #include "jack.h"
  28         #define M_PI 3.141562653
  29 #else
  30         #include <unistd.h>
  31         #include <jack/jack.h>
  32 #endif
  33
  34 class Freq
  35 {
  36 public:
  37
  38     int   p;
  39     int   f;
  40     float a;
  41     float xa;
  42     float ya;
  43     float xf;
  44     float yf;
  45 };
  46
  47
  48 class MTDM
  49 {
  50 public:
  51
  52     MTDM (void);
  53     int process (size_t len, float *inp, float *out);
  54     int resolve (void);
  55     void invert (void) { _inv ^= 1; }
  56     int    inv (void) { return _inv; }
  57     double del (void) { return _del; }
  58     double err (void) { return _err; }
  59
  60 private:
  61
  62     double  _del;
  63     double  _err;
  64     int     _cnt;
  65     int     _inv;
  66     Freq    _freq [5];
  67 };
  68
  69
  70 MTDM::MTDM (void) : _cnt (0), _inv (0)
  71 {
  72     int   i;
  73     Freq  *F;
  74
  75     _freq [0].f = 4096;
  76     _freq [1].f =  512;
  77     _freq [2].f = 1088;
  78     _freq [3].f = 1544;
  79     _freq [4].f = 2049;
  80
  81     _freq [0].a = 0.2f;
  82     _freq [1].a = 0.1f;
  83     _freq [2].a = 0.1f;
  84     _freq [3].a = 0.1f;
  85     _freq [4].a = 0.1f;
  86
  87     for (i = 0, F = _freq; i < 5; i++, F++)
  88     {
  89         F->p = 128;
  90         F->xa = F->ya = 0.0f;
  91         F->xf = F->yf = 0.0f;
  92     }
  93 }
  94
  95 int MTDM::process (size_t len, float *ip, float *op)
  96 {
  97     int    i;
  98     float  vip, vop, a, c, s;
  99     Freq   *F;
 100
 101     while (len--)
 102     {
 103         vop = 0.0f;
 104         vip = *ip++;
 105         for (i = 0, F = _freq; i < 5; i++, F++)
 106         {
 107             a = 2 * M_PI * (F->p & 0xFFFF) / 65536.0;
 108             F->p += F->f;
 109             c =  cosf (a);
 110             s = -sinf (a);
 111             vop += F->a * s;
 112             F->xa += s * vip;
 113             F->ya += c * vip;
 114         }
 115         *op++ = vop;
 116         if (++_cnt == 16)
 117         {
 118             for (i = 0, F = _freq; i < 5; i++, F++)
 119             {
 120                 F->xf += 1e-3f * (F->xa - F->xf + 1e-20);
 121                 F->yf += 1e-3f * (F->ya - F->yf + 1e-20);
 122                 F->xa = F->ya = 0.0f;
 123             }
 124             _cnt = 0;
 125         }
 126     }
 127
 128     return 0;
 129 }
 130
 131 int MTDM::resolve (void)
 132 {
 133     int     i, k, m;
 134     double  d, e, f0, p;
 135     Freq    *F = _freq;
 136
 137     if (hypot (F->xf, F->yf) < 0.01) return -1;
 138     d = atan2 (F->yf, F->xf) / (2 * M_PI);
 139     if (_inv) d += 0.5f;
 140     if (d > 0.5f) d -= 1.0f;
 141     f0 = _freq [0].f;
 142     m = 1;
 143     _err = 0.0;
 144     for (i = 0; i < 4; i++)
 145     {
 146         F++;
 147         p = atan2 (F->yf, F->xf) / (2 * M_PI) - d * F->f / f0;
 148         if (_inv) p += 0.5f;
 149         p -= floor (p);
 150         p *= 8;
 151         k = (int)(floor (p + 0.5));
 152         e = fabs (p - k);
 153         if (e > _err) _err = e;
 154         if (e > 0.4) return 1;
 155         d += m * (k & 7);
 156         m *= 8;
 157     }
 158     _del = 16 * d;
 159
 160     return 0;
 161 }
 162
 163 // --------------------------------------------------------------------------------
 164 static MTDM            mtdm;
 165 static jack_client_t  *jack_handle;
 166 static jack_port_t    *jack_capt;
 167 static jack_port_t    *jack_play;
 168
 169 static void jack_shutdown (void *arg)
 170 {
 171     exit (1);
 172 }
 173
 174 static int jack_callback (jack_nframes_t nframes, void *arg)
 175 {
 176     float *ip, *op;
 177
 178     ip = (float *)(jack_port_get_buffer (jack_capt, nframes));
 179     op = (float *)(jack_port_get_buffer (jack_play, nframes));
 180     return mtdm.process (nframes, ip, op);;
 181 }
 182
 183 int main (int ac, char *av [])
 184 {
 185     int i, k;
 186         const char** ports;
 187
 188     if ((jack_handle = jack_client_new ("jdelay")) == 0)
 189     {
 190         fprintf (stderr, "Can't connect to JACK\n");
 191         return 1;
 192     }
 193
 194     jack_set_process_callback (jack_handle, jack_callback, 0);
 195     jack_on_shutdown (jack_handle, jack_shutdown, 0);
 196     jack_capt = jack_port_register (jack_handle, "in",  JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
 197     jack_play = jack_port_register (jack_handle, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
 198
 199     if (jack_activate (jack_handle))
 200     {
 201         fprintf(stderr, "Can't activate JACK");
 202         return 1;
 203     }
 204
 205         if ((ports = jack_get_ports(jack_handle, NULL, NULL, JackPortIsPhysical | JackPortIsOutput)) == NULL) {
 206         printf("Cannot find any physical capture ports\n");
 207     } else {
 208                 for (int i = 0; i < 8 && ports[i] ; i++) {
 209                         jack_connect(jack_handle, ports[i], jack_port_name(jack_capt));
 210                 }
 211         free(ports);
 212     }
 213
 214     if ((ports = jack_get_ports(jack_handle, NULL, NULL, JackPortIsPhysical | JackPortIsInput)) == NULL) {
 215         printf("Cannot find any physical playback ports");
 216     } else {
 217                 for (int i = 0; i < 8 && ports[i]; i++) {
 218                         jack_connect(jack_handle, jack_port_name(jack_play), ports[i]);
 219                 }
 220                 free(ports);
 221     }
 222
 223     while (1)
 224     {
 225 #ifdef WIN32
 226         Sleep (250);
 227 #else
 228         usleep (250000);
 229 #endif
 230
 231         if (mtdm.resolve () < 0) printf ("Signal below threshold...\n");
 232         else
 233         {
 234             if (mtdm.err () > 0.3)
 235             {
 236                 mtdm.invert ();
 237                 mtdm.resolve ();
 238             }
 239             printf ("%10.3lf frames", mtdm.del ());
 240             if (mtdm.err () > 0.2) printf (" ??");
 241             if (mtdm.inv ()) printf (" Inv");
 242             printf ("\n");
 243         }
 244     }
 245
 246     return 0;
 247 }
 248