tests/jdelay.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 #include <math.h>
  24 #include <unistd.h>
  25 #include <jack/jack.h>
  26
  27 class Freq
  28 {
  29 public:
  30
  31     int   p;
  32     int   f;
  33     float a;
  34     float xa;
  35     float ya;
  36     float xf;
  37     float yf;
  38 };
  39
  40 class MTDM
  41 {
  42 public:
  43
  44     MTDM (void);
  45     int process (size_t len, float *inp, float *out);
  46     int resolve (void);
  47     void invert (void) { _inv ^= 1; }
  48     int    inv (void) { return _inv; }
  49     double del (void) { return _del; }
  50     double err (void) { return _err; }
  51
  52 private:
  53
  54     double  _del;
  55     double  _err;
  56     int     _cnt;
  57     int     _inv;
  58     Freq    _freq [5];
  59 };
  60
  61 MTDM::MTDM (void) : _cnt (0), _inv (0)
  62 {
  63     int   i;
  64     Freq  *F;
  65
  66     _freq [0].f = 4096;
  67     _freq [1].f =  512;
  68     _freq [2].f = 1088;
  69     _freq [3].f = 1544;
  70     _freq [4].f = 2049;
  71
  72     _freq [0].a = 0.2f;
  73     _freq [1].a = 0.1f;
  74     _freq [2].a = 0.1f;
  75     _freq [3].a = 0.1f;
  76     _freq [4].a = 0.1f;
  77
  78     for (i = 0, F = _freq; i < 5; i++, F++)
  79     {
  80         F->p = 128;
  81         F->xa = F->ya = 0.0f;
  82         F->xf = F->yf = 0.0f;
  83     }
  84 }
  85
  86 int MTDM::process (size_t len, float *ip, float *op)
  87 {
  88     int    i;
  89     float  vip, vop, a, c, s;
  90     Freq   *F;
  91
  92     while (len--)
  93     {
  94         vop = 0.0f;
  95         vip = *ip++;
  96         for (i = 0, F = _freq; i < 5; i++, F++)
  97         {
  98             a = 2 * (float) M_PI * (F->p & 65535) / 65536.0;
  99             F->p += F->f;
 100             c =  cosf (a);
 101             s = -sinf (a);
 102             vop += F->a * s;
 103             F->xa += s * vip;
 104             F->ya += c * vip;
 105         }
 106         *op++ = vop;
 107         if (++_cnt == 16)
 108         {
 109             for (i = 0, F = _freq; i < 5; i++, F++)
 110             {
 111                 F->xf += 1e-3f * (F->xa - F->xf + 1e-20);
 112                 F->yf += 1e-3f * (F->ya - F->yf + 1e-20);
 113                 F->xa = F->ya = 0.0f;
 114             }
 115             _cnt = 0;
 116         }
 117     }
 118
 119     return 0;
 120 }
 121
 122 int MTDM::resolve (void)
 123 {
 124     int     i, k, m;
 125     double  d, e, f0, p;
 126     Freq    *F = _freq;
 127
 128     if (hypot (F->xf, F->yf) < 0.01) return -1;
 129     d = atan2 (F->yf, F->xf) / (2 * M_PI);
 130     if (_inv) d += 0.5f;
 131     if (d > 0.5f) d -= 1.0f;
 132     f0 = _freq [0].f;
 133     m = 1;
 134     _err = 0.0;
 135     for (i = 0; i < 4; i++)
 136     {
 137         F++;
 138         p = atan2 (F->yf, F->xf) / (2 * M_PI) - d * F->f / f0;
 139         if (_inv) p += 0.5f;
 140         p -= floor (p);
 141         p *= 8;
 142         k = (int)(floor (p + 0.5));
 143         e = fabs (p - k);
 144         if (e > _err) _err = e;
 145         if (e > 0.4) return 1;
 146         d += m * (k & 7);
 147         m *= 8;
 148     }
 149     _del = 16 * d;
 150
 151     return 0;
 152 }
 153
 154 // --------------------------------------------------------------------------------
 155
 156 static MTDM            mtdm;
 157 static jack_client_t  *jack_handle;
 158 static jack_port_t    *jack_capt;
 159 static jack_port_t    *jack_play;
 160
 161 int jack_callback (jack_nframes_t nframes, void *arg)
 162 {
 163     float *ip, *op;
 164
 165     ip = (float *)(jack_port_get_buffer (jack_capt, nframes));
 166     op = (float *)(jack_port_get_buffer (jack_play, nframes));
 167     mtdm.process (nframes, ip, op);
 168     return 0;
 169 }
 170
 171 int main (int ac, char *av [])
 172 {
 173     float          t;
 174     jack_status_t  s;
 175
 176     jack_handle = jack_client_open ("jack_delay", JackNoStartServer, &s);
 177     if (jack_handle == 0)
 178     {
 179         fprintf (stderr, "Can't connect to Jack, is the server running ?\n");
 180         exit (1);
 181     }
 182
 183     jack_set_process_callback (jack_handle, jack_callback, 0);
 184
 185     jack_capt = jack_port_register (jack_handle, "in",  JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
 186     jack_play = jack_port_register (jack_handle, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
 187
 188     printf ("capture latency  = %d\n",
 189             jack_port_get_latency (jack_port_by_name (jack_handle, "system:capture_1")));
 190     printf ("playback_latency = %d\n",
 191             jack_port_get_latency (jack_port_by_name (jack_handle, "system:playback_1")));
 192
 193     t = 1000.0f / jack_get_sample_rate (jack_handle);
 194
 195     if (jack_activate (jack_handle))
 196     {
 197         fprintf(stderr, "Can't activate Jack");
 198         return 1;
 199     }
 200
 201     while (1)
 202     {
 203
 204     #ifdef WIN32
 205         Sleep (250);
 206     #else
 207         usleep (250000);
 208         #endif
 209         if (mtdm.resolve () < 0) printf ("Signal below threshold...\n");
 210         else
 211         {
 212             if (mtdm.err () > 0.3)
 213             {
 214                 mtdm.invert ();
 215                 mtdm.resolve ();
 216             }
 217             printf ("%10.3lf frames %10.3lf ms", mtdm.del (), mtdm.del () * t);
 218             if (mtdm.err () > 0.2) printf (" ??");
 219                 if (mtdm.inv ()) printf (" Inv");
 220             printf ("\n");
 221         }
 222     }
 223
 224     return 0;
 225 }
 226
 227 // --------------------------------------------------------------------------------