libs/ardour/ardour/pi_controller.h

   1 /*
   2   Copyright (C) 2008 Torben Hohn
   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 #ifndef __libardour_pi_controller__
  20 #define __libardour_pi_controller__
  21
  22 #include "ardour/libardour_visibility.h"
  23 #include "ardour/types.h"
  24
  25 class LIBARDOUR_API PIController {
  26 public:
  27         PIController (double resample_factor, int fir_size);
  28         ~PIController();
  29
  30         void reset (double resample_factor) {
  31                 resample_mean = resample_factor;
  32                 static_resample_factor = resample_factor;
  33                 out_of_bounds ();
  34         }
  35
  36         double get_ratio (int fill_level, int period_size);
  37         void out_of_bounds();
  38
  39 public:
  40         double  resample_mean;
  41         double  static_resample_factor;
  42         double* offset_array;
  43         double* window_array;
  44         int     offset_differential_index;
  45         double  offset_integral;
  46         double  catch_factor;
  47         double  catch_factor2;
  48         double  pclamp;
  49         double  controlquant;
  50         int     smooth_size;
  51         double  smooth_offset;
  52         double  current_resample_factor;
  53         bool    fir_empty;
  54 };
  55
  56 #define ESTIMATOR_SIZE 16
  57
  58 class LIBARDOUR_API PIChaser {
  59 public:
  60         PIChaser();
  61         ~PIChaser();
  62
  63         double get_ratio( framepos_t chasetime_measured, framepos_t chasetime, framepos_t slavetime_measured, framepos_t slavetime, bool in_control, int period_size );
  64         void reset();
  65         framepos_t want_locate() { return want_locate_val; }
  66
  67 private:
  68         PIController *pic;
  69         framepos_t realtime_stamps[ESTIMATOR_SIZE];
  70         framepos_t chasetime_stamps[ESTIMATOR_SIZE];
  71         int array_index;
  72         framepos_t want_locate_val;
  73
  74         void feed_estimator( framepos_t realtime, framepos_t chasetime );
  75         double get_estimate();
  76
  77         double speed;
  78
  79         double speed_threshold;
  80         framepos_t pos_threshold;
  81 };
  82
  83 #endif /* __libardour_pi_controller__ */