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jdelay.cc

/*
    Copyright (C) 2003 Fons Adriaensen <fons.adriaensen@skynet.be>
    
    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 <stdio.h>
#include <math.h>
#include <unistd.h>
#include <jack/jack.h>


00029 class Freq
{
public:

    int   p;
    int   f;
    float a;
    float xa;
    float ya;
    float xf;
    float yf;
};


00043 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; }

private:

    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 * M_PI * (F->p & 0xFFFF) / 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;


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));
    return mtdm.process (nframes, ip, op);;
}


int main (int ac, char *av [])
{
    int i, k;

    if ((jack_handle = jack_client_new ("jdelay")) == 0)
    {
        fprintf (stderr, "Can't connect to JACK\n");
        return 1;
    }

    jack_set_process_callback (jack_handle, jack_callback, 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);

    if (jack_activate (jack_handle))
    {
        fprintf(stderr, "Can't activate JACK");
        return 1;
    }

    while (1)
    {
      usleep (250000);

      if (mtdm.resolve () < 0) printf ("Signal below threshold...\n");
      else 
      {
          if (mtdm.err () > 0.3) 
          {
            mtdm.invert ();
            mtdm.resolve ();
          }
          printf ("%10.3lf", mtdm.del ());
          if (mtdm.err () > 0.2) printf (" ??");
            if (mtdm.inv ()) printf (" Inv");
          printf ("\n");
      }
    }

    return 0;
}


// --------------------------------------------------------------------------------

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