gtk2_ardour/volume_controller.cc

   1 /*
   2     Copyright (C) 1998-2007 Paul Davis
   3     This program is free software; you can redistribute it and/or modify
   4     it under the terms of the GNU General Public License as published by
   5     the Free Software Foundation; either version 2 of the License, or
   6     (at your option) any later version.
   7
   8     This program is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11     GNU General Public License for more details.
  12
  13     You should have received a copy of the GNU General Public License
  14     along with this program; if not, write to the Free Software
  15     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17     $Id: volume_controller.cc,v 1.4 2000/05/03 15:54:21 pbd Exp $
  18 */
  19
  20 #include <algorithm>
  21
  22 #include <string.h>
  23 #include <limits.h>
  24
  25 #include "pbd/controllable.h"
  26 #include "pbd/stacktrace.h"
  27
  28 #include "gtkmm2ext/gui_thread.h"
  29
  30 #include "ardour/dB.h"
  31 #include "ardour/rc_configuration.h"
  32 #include "ardour/utils.h"
  33
  34 #include "volume_controller.h"
  35
  36 using namespace Gtk;
  37
  38 VolumeController::VolumeController (Glib::RefPtr<Gdk::Pixbuf> p,
  39                                     boost::shared_ptr<PBD::Controllable> c,
  40                                     double def,
  41                                     double step,
  42                                     double page,
  43                                     bool with_numeric,
  44                                     int subw,
  45                                     int subh,
  46                                     bool linear)
  47
  48         : MotionFeedback (p, MotionFeedback::Rotary, c, def, step, page, "", with_numeric, subw, subh)
  49         , _linear (linear)
  50 {
  51         set_print_func (VolumeController::_dB_printer, this);
  52
  53         if (step < 1.0) {
  54                 value->set_width_chars (6 + abs ((int) ceil (log10 (step))));
  55         } else {
  56                 value->set_width_chars (5); // -NNdB
  57         }
  58
  59 }
  60
  61 void
  62 VolumeController::_dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c, void* arg)
  63 {
  64         VolumeController* vc = reinterpret_cast<VolumeController*>(arg);
  65         vc->dB_printer (buf, c);
  66 }
  67
  68 void
  69 VolumeController::dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c)
  70 {
  71         if (c) {
  72
  73                 if (_linear) {
  74
  75                         double val = accurate_coefficient_to_dB (c->get_value());
  76
  77                         if (step_inc < 1.0) {
  78                                 if (val >= 0.0) {
  79                                         snprintf (buf, 32, "+%5.2f dB", val);
  80                                 } else {
  81                                         snprintf (buf, 32, "%5.2f dB", val);
  82                                 }
  83                         } else {
  84                                 if (val >= 0.0) {
  85                                         snprintf (buf, 32, "+%2ld dB", lrint (val));
  86                                 } else {
  87                                         snprintf (buf, 32, "%2ld dB", lrint (val));
  88                                 }
  89                         }
  90
  91                 } else {
  92
  93                         double dB = accurate_coefficient_to_dB (c->get_value());
  94
  95                         if (step_inc < 1.0) {
  96                                 if (dB >= 0.0) {
  97                                         snprintf (buf, 32, "+%5.2f dB", dB);
  98                                 } else {
  99                                         snprintf (buf, 32, "%5.2f dB", dB);
 100                                 }
 101                         } else {
 102                                 if (dB >= 0.0) {
 103                                         snprintf (buf, 32, "+%2ld dB", lrint (dB));
 104                                 } else {
 105                                         snprintf (buf, 32, "%2ld dB", lrint (dB));
 106                                 }
 107                         }
 108                 }
 109         } else {
 110                 snprintf (buf, sizeof (buf), "--");
 111         }
 112 }
 113
 114 double
 115 VolumeController::to_control_value (double display_value)
 116 {
 117         double v;
 118
 119         /* display value is always clamped to 0.0 .. 1.0 */
 120         display_value = std::max (0.0, std::min (1.0, display_value));
 121
 122         if (_linear) {
 123                 v = _controllable->lower() + ((_controllable->upper() - _controllable->lower()) * display_value);
 124         } else {
 125                 v = slider_position_to_gain_with_max (display_value, ARDOUR::Config->get_max_gain());
 126         }
 127
 128         return v;
 129 }
 130
 131 double
 132 VolumeController::to_display_value (double control_value)
 133 {
 134         double v;
 135
 136         if (_linear) {
 137                 v = (control_value - _controllable->lower ()) / (_controllable->upper() - _controllable->lower());
 138         } else {
 139                 v = gain_to_slider_position_with_max (control_value, ARDOUR::Config->get_max_gain());
 140         }
 141
 142         return v;
 143 }
 144
 145 double
 146 VolumeController::adjust (double control_delta)
 147 {
 148         double v = _controllable->get_value ();
 149         double abs_delta = fabs (control_delta);
 150
 151         /* convert to linear/fractional slider position domain */
 152         v = gain_to_slider_position_with_max (v, ARDOUR::Config->get_max_gain());
 153         /* adjust in this domain */
 154         v += control_delta;
 155         /* convert back to gain coefficient domain */
 156         v = slider_position_to_gain_with_max (v, ARDOUR::Config->get_max_gain());
 157
 158         /* now round to some precision in the dB domain */
 159         v = accurate_coefficient_to_dB (v);
 160
 161         if (abs_delta <= 0.01) {
 162                 v -= fmod (v, 0.05);
 163         } else {
 164                 v -= fmod (v, 0.1);
 165         }
 166
 167         /* and return it */
 168         return dB_to_coefficient (v);
 169 }