tools/zalsa/timers.h

   1 // ----------------------------------------------------------------------------
   2 //
   3 //  Copyright (C) 2012-2018 Fons Adriaensen <fons@linuxaudio.org>
   4 //
   5 //  This program is free software; you can redistribute it and/or modify
   6 //  it under the terms of the GNU General Public License as published by
   7 //  the Free Software Foundation; either version 3 of the License, or
   8 //  (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful,
  11 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 //  GNU General Public License for more details.
  14 //
  15 //  You should have received a copy of the GNU General Public License
  16 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 //
  18 // ----------------------------------------------------------------------------
  19
  20
  21 #ifndef __TIMERS_H
  22 #define __TIMERS_H
  23
  24
  25 #include <math.h>
  26 #include <sys/time.h>
  27 #include <jack/jack.h>
  28
  29
  30 #define tjack_mod ldexp (1e-6f, 32)
  31
  32
  33
  34 inline double tjack_diff (double a, double b)
  35 {
  36     double d, m;
  37
  38     d = a - b;
  39     m = tjack_mod;
  40     while (d < -m / 2) d += m;
  41     while (d >= m / 2) d -= m;
  42     return d;
  43 }
  44
  45
  46 inline double tjack (jack_time_t t, double dt = 0)
  47 {
  48     int32_t u = (int32_t)(t & 0xFFFFFFFFLL);
  49     return 1e-6 * u;
  50 }
  51
  52
  53 #endif