libs/ardour/quantize.cc

   1 /*
   2     Copyright (C) 2004 Paul Davis
   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 #include <cmath>
  20
  21 #include "pbd/basename.h"
  22
  23 #include "ardour/types.h"
  24 #include "ardour/quantize.h"
  25 #include "ardour/session.h"
  26 #include "ardour/smf_source.h"
  27 #include "ardour/midi_region.h"
  28 #include "ardour/tempo.h"
  29
  30 #include "i18n.h"
  31
  32 using namespace std;
  33 using namespace ARDOUR;
  34
  35 /** Quantize notes
  36  *
  37  * grid parameters are the quantize value in beats, ie 1.0 = quantize to beats,
  38  * 0.25 = quantize to beats/4, etc.
  39  */
  40
  41 Quantize::Quantize (Session& s, QuantizeType /* type */,
  42                     bool snap_start, bool snap_end,
  43                     double start_grid, double end_grid,
  44                     float strength, float swing, float threshold)
  45         : session (s)
  46         , _snap_start (snap_start)
  47         , _snap_end (snap_end)
  48         , _start_grid(start_grid)
  49         , _end_grid(end_grid)
  50         , _strength (strength/100.0)
  51         , _swing (swing/100.0)
  52         , _threshold (threshold)
  53 {
  54 }
  55
  56 Quantize::~Quantize ()
  57 {
  58 }
  59
  60 int
  61 Quantize::operator () (std::vector<Evoral::Sequence<Evoral::MusicalTime>::Notes>& seqs)
  62 {
  63         bool even;
  64
  65         for (std::vector<Evoral::Sequence<Evoral::MusicalTime>::Notes>::iterator s = seqs.begin();
  66              s != seqs.end(); ++s) {
  67
  68                 even = false;
  69
  70                 for (Evoral::Sequence<MidiModel::TimeType>::Notes::iterator i = (*s).begin();
  71                      i != (*s).end(); ++i) {
  72
  73                         double new_start = round ((*i)->time() / _start_grid) * _start_grid;
  74                         double new_end = round ((*i)->end_time() / _end_grid) * _end_grid;
  75                         double delta;
  76
  77                         if (_swing > 0.0 && !even) {
  78
  79                                 double next_grid = new_start + _start_grid;
  80
  81                                 /* find a spot 2/3 (* swing factor) of the way between the grid point
  82                                    we would put this note at, and the nominal position of the next note.
  83                                 */
  84
  85                                 new_start = new_start + (2.0/3.0 * _swing * (next_grid - new_start));
  86
  87                         } else if (_swing < 0.0 && !even) {
  88
  89                                 double prev_grid = new_start - _start_grid;
  90
  91                                 /* find a spot 2/3 (* swing factor) of the way between the grid point
  92                                    we would put this note at, and the nominal position of the previous note.
  93                                 */
  94
  95                                 new_start = new_start - (2.0/3.0 * _swing * (new_start - prev_grid));
  96
  97                         }
  98
  99                         delta = new_start - (*i)->time();
 100
 101                         if (fabs (delta) >= _threshold) {
 102                                 if (_snap_start) {
 103                                         delta *= _strength;
 104                                         (*i)->set_time ((*i)->time() + delta);
 105                                 }
 106                         }
 107
 108                         if (_snap_end) {
 109                                 delta = new_end - (*i)->end_time();
 110
 111                                 if (fabs (delta) >= _threshold) {
 112                                         double new_dur = new_end - new_start;
 113
 114                                         if (new_dur == 0.0) {
 115                                                 new_dur = _end_grid;
 116                                         }
 117
 118                                         (*i)->set_length (new_dur);
 119                                 }
 120                         }
 121
 122                         even = !even;
 123                 }
 124         }
 125
 126         return 0;
 127 }