gtk2_ardour/level_meter.cc

   1 /*
   2   Copyright (C) 2002 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
  20 #include <limits.h>
  21
  22 #include "ardour/meter.h"
  23
  24 #include <gtkmm2ext/utils.h>
  25 #include "pbd/fastlog.h"
  26
  27 #include "level_meter.h"
  28 #include "utils.h"
  29 #include "logmeter.h"
  30 #include "gui_thread.h"
  31 #include "keyboard.h"
  32 #include "public_editor.h"
  33 #include "ui_config.h"
  34
  35 #include "pbd/i18n.h"
  36
  37 using namespace ARDOUR;
  38 using namespace ARDOUR_UI_UTILS;
  39 using namespace PBD;
  40 using namespace Gtkmm2ext;
  41 using namespace Gtk;
  42 using namespace std;
  43
  44 LevelMeterBase::LevelMeterBase (Session* s, PBD::EventLoop::InvalidationRecord* ir, FastMeter::Orientation o)
  45         : parent_invalidator(ir)
  46         , _meter (0)
  47         , _meter_orientation(o)
  48         , regular_meter_width (6)
  49         , meter_length (0)
  50         , thin_meter_width(2)
  51         , max_peak (minus_infinity())
  52         , meter_type (MeterPeak)
  53         , visible_meter_type (MeterType(0))
  54         , meter_count (0)
  55         , max_visible_meters (0)
  56         , color_changed (false)
  57 {
  58         set_session (s);
  59
  60         Config->ParameterChanged.connect (_parameter_connection, parent_invalidator, boost::bind (&LevelMeterBase::parameter_changed, this, _1), gui_context());
  61         UIConfiguration::instance().ParameterChanged.connect (sigc::mem_fun(*this, &LevelMeterBase::parameter_changed));
  62         UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &LevelMeterBase::color_handler));
  63 }
  64
  65 LevelMeterBase::~LevelMeterBase ()
  66 {
  67         _configuration_connection.disconnect();
  68         _meter_type_connection.disconnect();
  69         _parameter_connection.disconnect();
  70         for (vector<MeterInfo>::iterator i = meters.begin(); i != meters.end(); i++) {
  71                 delete (*i).meter;
  72         }
  73         meters.clear();
  74 }
  75
  76 void
  77 LevelMeterBase::set_meter (PeakMeter* meter)
  78 {
  79         _configuration_connection.disconnect();
  80         _meter_type_connection.disconnect();
  81
  82         _meter = meter;
  83         color_changed = true; // force update
  84
  85         if (_meter) {
  86                 _meter->ConfigurationChanged.connect (_configuration_connection, parent_invalidator, boost::bind (&LevelMeterBase::configuration_changed, this, _1, _2), gui_context());
  87                 _meter->TypeChanged.connect (_meter_type_connection, parent_invalidator, boost::bind (&LevelMeterBase::meter_type_changed, this, _1), gui_context());
  88         }
  89 }
  90
  91 static float meter_lineup_cfg(MeterLineUp lul, float offset) {
  92         switch (lul) {
  93                 case MeteringLineUp24:
  94                         return offset + 6.0;
  95                 case MeteringLineUp20:
  96                         return offset + 2.0;
  97                 case MeteringLineUp18:
  98                         return offset;
  99                 case MeteringLineUp15:
 100                         return offset - 3.0;
 101                 default:
 102                         break;
 103         }
 104         return offset;
 105 }
 106
 107 static float meter_lineup(float offset) {
 108         return meter_lineup_cfg (UIConfiguration::instance().get_meter_line_up_level(), offset);
 109 }
 110
 111 static float vu_standard() {
 112         // note - default meter config is +2dB (france)
 113         switch (UIConfiguration::instance().get_meter_vu_standard()) {
 114                 default:
 115                 case MeteringVUfrench:   // 0VU = -2dBu
 116                         return 0;
 117                 case MeteringVUamerican: // 0VU =  0dBu
 118                         return -2;
 119                 case MeteringVUstandard: // 0VU = +4dBu
 120                         return -6;
 121                 case MeteringVUeight:    // 0VU = +8dBu
 122                         return -10;
 123         }
 124 }
 125
 126 float
 127 LevelMeterBase::update_meters ()
 128 {
 129         vector<MeterInfo>::iterator i;
 130         uint32_t n;
 131
 132         if (!_meter) {
 133                 return 0.0f;
 134         }
 135
 136         uint32_t nmidi = _meter->input_streams().n_midi();
 137
 138         for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 139                 if ((*i).packed) {
 140                         const float mpeak = _meter->meter_level(n, MeterMaxPeak);
 141                         if (mpeak > (*i).max_peak) {
 142                                 (*i).max_peak = mpeak;
 143                                 (*i).meter->set_highlight(mpeak >= UIConfiguration::instance().get_meter_peak());
 144                         }
 145                         if (mpeak > max_peak) {
 146                                 max_peak = mpeak;
 147                         }
 148
 149                         if (n < nmidi) {
 150                                 (*i).meter->set (_meter->meter_level (n, MeterPeak));
 151                         } else {
 152                                 const float peak = _meter->meter_level (n, meter_type);
 153                                 if (meter_type == MeterPeak) {
 154                                         (*i).meter->set (log_meter (peak));
 155                                 } else if (meter_type == MeterPeak0dB) {
 156                                         (*i).meter->set (log_meter0dB (peak));
 157                                 } else if (meter_type == MeterIEC1NOR) {
 158                                         (*i).meter->set (meter_deflect_nordic (peak + meter_lineup(0)));
 159                                 } else if (meter_type == MeterIEC1DIN) {
 160                                         (*i).meter->set (meter_deflect_din (peak + meter_lineup_cfg(UIConfiguration::instance().get_meter_line_up_din(), 3.0)));
 161                                 } else if (meter_type == MeterIEC2BBC || meter_type == MeterIEC2EBU) {
 162                                         (*i).meter->set (meter_deflect_ppm (peak + meter_lineup(0)));
 163                                 } else if (meter_type == MeterVU) {
 164                                         (*i).meter->set (meter_deflect_vu (peak + vu_standard() + meter_lineup(0)));
 165                                 } else if (meter_type == MeterK12) {
 166                                         (*i).meter->set (meter_deflect_k (peak, 12), meter_deflect_k(_meter->meter_level(n, MeterPeak), 12));
 167                                 } else if (meter_type == MeterK14) {
 168                                         (*i).meter->set (meter_deflect_k (peak, 14), meter_deflect_k(_meter->meter_level(n, MeterPeak), 14));
 169                                 } else if (meter_type == MeterK20) {
 170                                         (*i).meter->set (meter_deflect_k (peak, 20), meter_deflect_k(_meter->meter_level(n, MeterPeak), 20));
 171                                 } else { // RMS
 172                                         (*i).meter->set (log_meter (peak), log_meter(_meter->meter_level(n, MeterPeak)));
 173                                 }
 174                         }
 175                 }
 176         }
 177         return max_peak;
 178 }
 179
 180 void
 181 LevelMeterBase::parameter_changed (string p)
 182 {
 183         ENSURE_GUI_THREAD (*this, &LevelMeterBase::parameter_changed, p)
 184
 185         if (p == "meter-hold") {
 186                 vector<MeterInfo>::iterator i;
 187                 uint32_t n;
 188
 189                 for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 190                         (*i).meter->set_hold_count ((uint32_t) floor(UIConfiguration::instance().get_meter_hold()));
 191                 }
 192         }
 193         else if (p == "meter-line-up-level") {
 194                 color_changed = true;
 195                 setup_meters (meter_length, regular_meter_width, thin_meter_width);
 196         }
 197         else if (p == "meter-style-led") {
 198                 color_changed = true;
 199                 setup_meters (meter_length, regular_meter_width, thin_meter_width);
 200         }
 201         else if (p == "meter-peak") {
 202                 vector<MeterInfo>::iterator i;
 203                 uint32_t n;
 204
 205                 for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 206                         (*i).max_peak = minus_infinity();
 207                 }
 208         }
 209 }
 210
 211 void
 212 LevelMeterBase::configuration_changed (ChanCount /*in*/, ChanCount /*out*/)
 213 {
 214         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 215 }
 216
 217 void
 218 LevelMeterBase::meter_type_changed (MeterType t)
 219 {
 220         meter_type = t;
 221         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 222         MeterTypeChanged(t);
 223 }
 224
 225 void
 226 LevelMeterBase::hide_all_meters ()
 227 {
 228         for (vector<MeterInfo>::iterator i = meters.begin(); i != meters.end(); ++i) {
 229                 if ((*i).packed) {
 230                         mtr_remove (*((*i).meter));
 231                         (*i).packed = false;
 232                 }
 233         }
 234         meter_count = 0;
 235 }
 236
 237 void
 238 LevelMeterBase::set_max_audio_meter_count (uint32_t cnt)
 239 {
 240         if (cnt == max_visible_meters) {
 241                 return;
 242         }
 243         color_changed = true; // force re-setup
 244         max_visible_meters = cnt;
 245         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 246 }
 247
 248 void
 249 LevelMeterBase::setup_meters (int len, int initial_width, int thin_width)
 250 {
 251
 252         if (!_meter) {
 253                 hide_all_meters ();
 254                 return; /* do it later or never */
 255         }
 256
 257         int32_t nmidi = _meter->input_streams().n_midi();
 258         uint32_t nmeters = _meter->input_streams().n_total();
 259         regular_meter_width = initial_width;
 260         thin_meter_width = thin_width;
 261         meter_length = len;
 262
 263         guint16 width;
 264
 265         if (nmeters == 0) {
 266                 hide_all_meters ();
 267                 return;
 268         }
 269
 270         if (nmeters <= 2) {
 271                 width = regular_meter_width;
 272         } else {
 273                 width = thin_meter_width;
 274         }
 275
 276         width = rint (width * UIConfiguration::instance().get_ui_scale());
 277
 278         if (   meters.size() > 0
 279             && nmeters == meter_count
 280             && meters[0].width == width
 281             && meters[0].length == len
 282             && !color_changed
 283             && meter_type == visible_meter_type) {
 284                 return;
 285         }
 286
 287 #if 0
 288         printf("Meter redraw: %s %s %s %s %s %s\n",
 289                         (meters.size() > 0) ? "yes" : "no",
 290                         (meters.size() > 0 &&  meters[0].width == width) ? "yes" : "no",
 291                         (meters.size() > 0 &&  meters[0].length == len) ? "yes" : "no",
 292                         (nmeters == meter_count) ? "yes" : "no",
 293                         (meter_type == visible_meter_type) ? "yes" : "no",
 294                         !color_changed ? "yes" : "no"
 295                         );
 296 #endif
 297
 298         hide_all_meters ();
 299         while (meters.size() < nmeters) {
 300                 meters.push_back (MeterInfo());
 301         }
 302
 303         //cerr << "LevelMeterBase::setup_meters() called color_changed = " << color_changed << " colors: " << endl;//DEBUG
 304
 305         for (int32_t n = nmeters-1; nmeters && n >= 0 ; --n) {
 306                 uint32_t c[10];
 307                 uint32_t b[4];
 308                 float stp[4];
 309                 int styleflags = UIConfiguration::instance().get_meter_style_led() ? 3 : 1;
 310                 b[0] = UIConfiguration::instance().color ("meter background bottom");
 311                 b[1] = UIConfiguration::instance().color ("meter background top");
 312                 b[2] = 0x991122ff; // red highlight gradient Bot
 313                 b[3] = 0x551111ff; // red highlight gradient Top
 314                 if (n < nmidi) {
 315                         c[0] = UIConfiguration::instance().color ("midi meter color0");
 316                         c[1] = UIConfiguration::instance().color ("midi meter color1");
 317                         c[2] = UIConfiguration::instance().color ("midi meter color2");
 318                         c[3] = UIConfiguration::instance().color ("midi meter color3");
 319                         c[4] = UIConfiguration::instance().color ("midi meter color4");
 320                         c[5] = UIConfiguration::instance().color ("midi meter color5");
 321                         c[6] = UIConfiguration::instance().color ("midi meter color6");
 322                         c[7] = UIConfiguration::instance().color ("midi meter color7");
 323                         c[8] = UIConfiguration::instance().color ("midi meter color8");
 324                         c[9] = UIConfiguration::instance().color ("midi meter color9");
 325                         stp[0] = 115.0 *  32.0 / 128.0;
 326                         stp[1] = 115.0 *  64.0 / 128.0;
 327                         stp[2] = 115.0 * 100.0 / 128.0;
 328                         stp[3] = 115.0 * 112.0 / 128.0;
 329                 } else {
 330                         c[0] = UIConfiguration::instance().color ("meter color0");
 331                         c[1] = UIConfiguration::instance().color ("meter color1");
 332                         c[2] = UIConfiguration::instance().color ("meter color2");
 333                         c[3] = UIConfiguration::instance().color ("meter color3");
 334                         c[4] = UIConfiguration::instance().color ("meter color4");
 335                         c[5] = UIConfiguration::instance().color ("meter color5");
 336                         c[6] = UIConfiguration::instance().color ("meter color6");
 337                         c[7] = UIConfiguration::instance().color ("meter color7");
 338                         c[8] = UIConfiguration::instance().color ("meter color8");
 339                         c[9] = UIConfiguration::instance().color ("meter color9");
 340
 341                         switch (meter_type) {
 342                                 case MeterK20:
 343                                         stp[0] = 115.0 * meter_deflect_k(-40, 20);  //-20
 344                                         stp[1] = 115.0 * meter_deflect_k(-20, 20);  //  0
 345                                         stp[2] = 115.0 * meter_deflect_k(-18, 20);  // +2
 346                                         stp[3] = 115.0 * meter_deflect_k(-16, 20);  // +4
 347                                         c[0] = c[1] = 0x008800ff;
 348                                         c[2] = c[3] = 0x00ff00ff;
 349                                         c[4] = c[5] = 0xffff00ff;
 350                                         c[6] = c[7] = 0xffff00ff;
 351                                         c[8] = c[9] = 0xff0000ff;
 352                                         break;
 353                                 case MeterK14:
 354                                         stp[0] = 115.0 * meter_deflect_k(-34, 14);  //-20
 355                                         stp[1] = 115.0 * meter_deflect_k(-14, 14);  //  0
 356                                         stp[2] = 115.0 * meter_deflect_k(-12, 14);  // +2
 357                                         stp[3] = 115.0 * meter_deflect_k(-10, 14);  // +4
 358                                         c[0] = c[1] = 0x008800ff;
 359                                         c[2] = c[3] = 0x00ff00ff;
 360                                         c[4] = c[5] = 0xffff00ff;
 361                                         c[6] = c[7] = 0xffff00ff;
 362                                         c[8] = c[9] = 0xff0000ff;
 363                                         break;
 364                                 case MeterK12:
 365                                         stp[0] = 115.0 * meter_deflect_k(-32, 12);  //-20
 366                                         stp[1] = 115.0 * meter_deflect_k(-12, 12);  //  0
 367                                         stp[2] = 115.0 * meter_deflect_k(-10, 12);  // +2
 368                                         stp[3] = 115.0 * meter_deflect_k( -8, 12);  // +4
 369                                         c[0] = c[1] = 0x008800ff;
 370                                         c[2] = c[3] = 0x00ff00ff;
 371                                         c[4] = c[5] = 0xffff00ff;
 372                                         c[6] = c[7] = 0xffff00ff;
 373                                         c[8] = c[9] = 0xff0000ff;
 374                                         break;
 375                                 case MeterIEC2BBC:
 376                                         c[0] = c[1] = c[2] = c[3] = c[4] = c[5] = c[6] = c[7] = c[8] = c[9] =
 377                                                 UIConfiguration::instance().color ("meter color BBC");
 378                                         stp[0] = stp[1] = stp[2] = stp[3] = 115.0;
 379                                         break;
 380                                 case MeterIEC2EBU:
 381                                         stp[0] = 115.0 * meter_deflect_ppm(-24); // ignored
 382                                         stp[1] = 115.0 * meter_deflect_ppm(-18);
 383                                         stp[2] = 115.0 * meter_deflect_ppm( -9);
 384                                         stp[3] = 115.0 * meter_deflect_ppm(  0); // ignored
 385                                         c[3] = c[2] = c[1];
 386                                         c[6] = c[7] = c[8] = c[9];
 387                                         break;
 388                                 case MeterIEC1NOR:
 389                                         stp[0] = 115.0 * meter_deflect_nordic(-30); // ignored
 390                                         stp[1] = 115.0 * meter_deflect_nordic(-18);
 391                                         stp[2] = 115.0 * meter_deflect_nordic(-12);
 392                                         stp[3] = 115.0 * meter_deflect_nordic( -9); // ignored
 393                                         c[0] = c[1] = c[2]; // bright-green
 394                                         c[6] = c[7] = c[8] = c[9];
 395                                         break;
 396                                 case MeterIEC1DIN:
 397                                         stp[0] = 115.0 * meter_deflect_din(-29); // ignored
 398                                         stp[1] = 115.0 * meter_deflect_din(-18);
 399                                         stp[2] = 115.0 * meter_deflect_din(-15); // ignored
 400                                         stp[3] = 115.0 * meter_deflect_din( -9);
 401                                         c[0] = c[2] = c[3] = c[1];
 402                                         c[4] = c[6];
 403                                         c[5] = c[7];
 404                                         break;
 405                                 case MeterVU:
 406                                         stp[0] = 115.0 * meter_deflect_vu(-26); // -6
 407                                         stp[1] = 115.0 * meter_deflect_vu(-23); // -3
 408                                         stp[2] = 115.0 * meter_deflect_vu(-20); // 0
 409                                         stp[3] = 115.0 * meter_deflect_vu(-18); // +2
 410                                         c[0] = c[2] = c[3] = c[4] = c[5] = c[1];
 411                                         c[7] = c[8] = c[9] = c[6];
 412                                         break;
 413                                 case MeterPeak0dB:
 414                                          stp[1] =  89.125; // 115.0 * log_meter0dB(-9);
 415                                          stp[2] = 106.375; // 115.0 * log_meter0dB(-3);
 416                                          stp[3] = 115.0;   // 115.0 * log_meter0dB(0);
 417                                         switch (UIConfiguration::instance().get_meter_line_up_level()) {
 418                                         case MeteringLineUp24:
 419                                                 stp[0] = 115.0 * log_meter0dB(-24);
 420                                                 break;
 421                                         case MeteringLineUp20:
 422                                                 stp[0] = 115.0 * log_meter0dB(-20);
 423                                                 break;
 424                                         default:
 425                                         case MeteringLineUp18:
 426                                                 stp[0] = 115.0 * log_meter0dB(-18);
 427                                                 break;
 428                                         case MeteringLineUp15:
 429                                                 stp[0] = 115.0 * log_meter0dB(-15);
 430                                         }
 431                                         break;
 432                                 default: // PEAK, RMS
 433                                         stp[1] = 77.5;  // 115 * log_meter(-9)
 434                                         stp[2] = 92.5;  // 115 * log_meter(-3)
 435                                         stp[3] = 100.0; // 115 * log_meter(0)
 436                                         switch (UIConfiguration::instance().get_meter_line_up_level()) {
 437                                         case MeteringLineUp24:
 438                                                 stp[0] = 42.0;
 439                                                 break;
 440                                         case MeteringLineUp20:
 441                                                 stp[0] = 50.0;
 442                                                 break;
 443                                         default:
 444                                         case MeteringLineUp18:
 445                                                 stp[0] = 55.0;
 446                                                 break;
 447                                         case MeteringLineUp15:
 448                                                 stp[0] = 62.5;
 449                                                 break;
 450                                 }
 451                         }
 452                 }
 453                 if (meters[n].width != width || meters[n].length != len || color_changed || meter_type != visible_meter_type) {
 454                         bool hl = meters[n].meter ? meters[n].meter->get_highlight() : false;
 455                         meters[n].packed = false;
 456                         delete meters[n].meter;
 457                         meters[n].meter = new FastMeter ((uint32_t) floor (UIConfiguration::instance().get_meter_hold()), width, _meter_orientation, len,
 458                                         c[0], c[1], c[2], c[3], c[4],
 459                                         c[5], c[6], c[7], c[8], c[9],
 460                                         b[0], b[1], b[2], b[3],
 461                                         stp[0], stp[1], stp[2], stp[3],
 462                                         styleflags
 463                                         );
 464                         meters[n].meter->set_highlight(hl);
 465                         meters[n].width = width;
 466                         meters[n].length = len;
 467                         meters[n].meter->add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK);
 468                         meters[n].meter->signal_button_press_event().connect (sigc::mem_fun (*this, &LevelMeterBase::meter_button_press), false);
 469                         meters[n].meter->signal_button_release_event().connect (sigc::mem_fun (*this, &LevelMeterBase::meter_button_release), false);
 470                 }
 471
 472                 //pack_end (*meters[n].meter, false, false);
 473                 mtr_pack (*meters[n].meter);
 474                 meters[n].packed = true;
 475                 if (max_visible_meters == 0 || (uint32_t) n < max_visible_meters + nmidi) {
 476                         meters[n].meter->show_all ();
 477                 } else {
 478                         meters[n].meter->hide ();
 479                 }
 480         }
 481         //show();
 482         color_changed = false;
 483         visible_meter_type = meter_type;
 484         meter_count = nmeters;
 485 }
 486
 487 void
 488 LevelMeterBase::set_type(MeterType t)
 489 {
 490         meter_type = t;
 491         _meter->set_type(t);
 492 }
 493
 494 bool
 495 LevelMeterBase::meter_button_press (GdkEventButton* ev)
 496 {
 497         return static_cast<bool>(ButtonPress (ev)); /* EMIT SIGNAL */
 498 }
 499
 500 bool
 501 LevelMeterBase::meter_button_release (GdkEventButton* ev)
 502 {
 503         if (ev->button == 1) {
 504                 clear_meters (false);
 505         }
 506         ButtonRelease(ev);
 507
 508         return true;
 509 }
 510
 511
 512 void LevelMeterBase::clear_meters (bool reset_highlight)
 513 {
 514         for (vector<MeterInfo>::iterator i = meters.begin(); i < meters.end(); i++) {
 515                 (*i).meter->clear();
 516                 (*i).max_peak = minus_infinity();
 517                 if (reset_highlight)
 518                         (*i).meter->set_highlight(false);
 519         }
 520         max_peak = minus_infinity();
 521 }
 522
 523 void LevelMeterBase::hide_meters ()
 524 {
 525         hide_all_meters();
 526 }
 527
 528 void
 529 LevelMeterBase::color_handler ()
 530 {
 531         color_changed = true;
 532         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 533 }
 534
 535 LevelMeterHBox::LevelMeterHBox(Session* s)
 536         : LevelMeterBase(s, invalidator(*this))
 537 {
 538         set_spacing(1);
 539         show();
 540 }
 541
 542
 543 LevelMeterHBox::~LevelMeterHBox() {}
 544
 545 void
 546 LevelMeterHBox::mtr_pack(Gtk::Widget &w) {
 547         pack_end (w, false, false);
 548 }
 549
 550 void
 551 LevelMeterHBox::mtr_remove(Gtk::Widget &w) {
 552         remove (w);
 553 }
 554
 555
 556 LevelMeterVBox::LevelMeterVBox(Session* s)
 557         : LevelMeterBase(s, invalidator(*this), FastMeter::Horizontal)
 558 {
 559         set_spacing(1);
 560         show();
 561 }
 562 LevelMeterVBox::~LevelMeterVBox() {}
 563
 564 void
 565 LevelMeterVBox::mtr_pack(Gtk::Widget &w) {
 566         pack_end (w, false, false);
 567 }
 568
 569 void
 570 LevelMeterVBox::mtr_remove(Gtk::Widget &w) {
 571         remove (w);
 572 }