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         value->set_width_chars (8);
  53 }
  54
  55 void
  56 VolumeController::_dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c, void* arg)
  57 {
  58         VolumeController* vc = reinterpret_cast<VolumeController*>(arg);
  59         vc->dB_printer (buf, c);
  60 }
  61
  62 void
  63 VolumeController::dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c)
  64 {
  65         if (c) {
  66
  67                 if (_linear) {
  68
  69                         double val = accurate_coefficient_to_dB (c->get_value());
  70
  71                         if (step_inc < 1.0) {
  72                                 if (val >= 0.0) {
  73                                         snprintf (buf, 32, "+%5.2f dB", val);
  74                                 } else {
  75                                         snprintf (buf, 32, "%5.2f dB", val);
  76                                 }
  77                         } else {
  78                                 if (val >= 0.0) {
  79                                         snprintf (buf, 32, "+%2ld dB", lrint (val));
  80                                 } else {
  81                                         snprintf (buf, 32, "%2ld dB", lrint (val));
  82                                 }
  83                         }
  84
  85                 } else {
  86
  87                         double dB = accurate_coefficient_to_dB (c->get_value());
  88
  89                         if (step_inc < 1.0) {
  90                                 if (dB >= 0.0) {
  91                                         snprintf (buf, 32, "+%5.2f dB", dB);
  92                                 } else {
  93                                         snprintf (buf, 32, "%5.2f dB", dB);
  94                                 }
  95                         } else {
  96                                 if (dB >= 0.0) {
  97                                         snprintf (buf, 32, "+%2ld dB", lrint (dB));
  98                                 } else {
  99                                         snprintf (buf, 32, "%2ld dB", lrint (dB));
 100                                 }
 101                         }
 102                 }
 103         } else {
 104                 snprintf (buf, sizeof (buf), "--");
 105         }
 106 }
 107
 108 double
 109 VolumeController::to_control_value (double display_value)
 110 {
 111         double v;
 112
 113         /* display value is always clamped to 0.0 .. 1.0 */
 114         display_value = std::max (0.0, std::min (1.0, display_value));
 115
 116         if (_linear) {
 117                 v = _controllable->lower() + ((_controllable->upper() - _controllable->lower()) * display_value);
 118         } else {
 119                 v = slider_position_to_gain_with_max (display_value, ARDOUR::Config->get_max_gain());
 120         }
 121
 122         return v;
 123 }
 124
 125 double
 126 VolumeController::to_display_value (double control_value)
 127 {
 128         double v;
 129
 130         if (_linear) {
 131                 v = (control_value - _controllable->lower ()) / (_controllable->upper() - _controllable->lower());
 132         } else {
 133                 v = gain_to_slider_position_with_max (control_value, _controllable->upper());
 134         }
 135
 136         return v;
 137 }
 138
 139 double
 140 VolumeController::adjust (double control_delta)
 141 {
 142         double v;
 143
 144         if (!_linear) {
 145
 146                 /* we map back into the linear/fractional slider position,
 147                  * because this kind of control goes all the way down
 148                  * to -inf dB, and we want this occur in a reasonable way in
 149                  * terms of user interaction. if we leave the adjustment in the
 150                  * gain coefficient domain (or dB domain), the lower end of the
 151                  * control range (getting close to -inf dB) takes forever.
 152                  */
 153
 154                 /* convert to linear/fractional slider position domain */
 155                 v = gain_to_slider_position_with_max (_controllable->get_value (), _controllable->upper());
 156                 /* increment in this domain */
 157                 v += control_delta;
 158                 /* clamp to appropriate range for linear/fractional slider domain */
 159                 v = std::max (0.0, std::min (1.0, v));
 160                 /* convert back to gain coefficient domain */
 161                 v = slider_position_to_gain_with_max (v, _controllable->upper());
 162                 /* clamp in controller domain */
 163                 v = std::max (_controllable->lower(), std::min (_controllable->upper(), v));
 164                 /* convert to dB domain */
 165                 v = accurate_coefficient_to_dB (v);
 166                 /* round up/down to nearest 0.1dB */
 167                 if (control_delta > 0.0) {
 168                         v = ceil (v * 10.0) / 10.0;
 169                 } else {
 170                         v = floor (v * 10.0) / 10.0;
 171                 }
 172                 /* and return it */
 173                 return dB_to_coefficient (v);
 174         } else {
 175                 double mult;
 176
 177                 if (control_delta < 0.0) {
 178                         mult = -1.0;
 179                 } else {
 180                         mult = 1.0;
 181                 }
 182
 183                 if (fabs (control_delta) < 0.05) {
 184                         control_delta = mult * 0.05;
 185                 } else  {
 186                         control_delta = mult * 0.1;
 187                 }
 188
 189                 v = _controllable->get_value();
 190
 191                 if (v == 0.0) {
 192                         /* if we don't special case this, we can't escape from
 193                            the -infinity dB black hole.
 194                         */
 195                         if (control_delta > 0.0) {
 196                                 v = dB_to_coefficient (-100 + control_delta);
 197                         }
 198                 } else {
 199                         static const double dB_minus_200 = dB_to_coefficient (-200.0);
 200                         static const double dB_minus_100 = dB_to_coefficient (-100.0);
 201                         static const double dB_minus_50 = dB_to_coefficient (-50.0);
 202                         static const double dB_minus_20 = dB_to_coefficient (-20.0);
 203
 204                         if (control_delta < 0 && v < dB_minus_200) {
 205                                 v = 0.0;
 206                         } else {
 207
 208                                 /* non-linear scaling as the dB level gets low
 209                                    so that we can hit -inf and get back out of
 210                                    it appropriately.
 211                                 */
 212
 213                                 if (v < dB_minus_100) {
 214                                         control_delta *= 1000.0;
 215                                 } else if (v < dB_minus_50) {
 216                                         control_delta *= 100.0;
 217                                 } else if (v < dB_minus_20) {
 218                                         control_delta *= 10.0;
 219                                 }
 220
 221                                 v = accurate_coefficient_to_dB (v);
 222                                 v += control_delta;
 223                                 v = dB_to_coefficient (v);
 224                         }
 225                 }
 226
 227                 return std::max (_controllable->lower(), std::min (_controllable->upper(), v));
 228         }
 229
 230 }