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         , midi_count (0)
  55         , meter_count (0)
  56         , max_visible_meters (0)
  57         , color_changed (false)
  58 {
  59         set_session (s);
  60
  61         Config->ParameterChanged.connect (_parameter_connection, parent_invalidator, boost::bind (&LevelMeterBase::parameter_changed, this, _1), gui_context());
  62         UIConfiguration::instance().ParameterChanged.connect (sigc::mem_fun(*this, &LevelMeterBase::parameter_changed));
  63         UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &LevelMeterBase::color_handler));
  64 }
  65
  66 LevelMeterBase::~LevelMeterBase ()
  67 {
  68         _configuration_connection.disconnect();
  69         _meter_type_connection.disconnect();
  70         _parameter_connection.disconnect();
  71         for (vector<MeterInfo>::iterator i = meters.begin(); i != meters.end(); i++) {
  72                 delete (*i).meter;
  73         }
  74         meters.clear();
  75 }
  76
  77 void
  78 LevelMeterBase::set_meter (PeakMeter* meter)
  79 {
  80         _configuration_connection.disconnect();
  81         _meter_type_connection.disconnect();
  82
  83         _meter = meter;
  84         color_changed = true; // force update
  85
  86         if (_meter) {
  87                 _meter->ConfigurationChanged.connect (_configuration_connection, parent_invalidator, boost::bind (&LevelMeterBase::configuration_changed, this, _1, _2), gui_context());
  88                 _meter->TypeChanged.connect (_meter_type_connection, parent_invalidator, boost::bind (&LevelMeterBase::meter_type_changed, this, _1), gui_context());
  89         }
  90 }
  91
  92 static float meter_lineup_cfg(MeterLineUp lul, float offset) {
  93         switch (lul) {
  94                 case MeteringLineUp24:
  95                         return offset + 6.0;
  96                 case MeteringLineUp20:
  97                         return offset + 2.0;
  98                 case MeteringLineUp18:
  99                         return offset;
 100                 case MeteringLineUp15:
 101                         return offset - 3.0;
 102                 default:
 103                         break;
 104         }
 105         return offset;
 106 }
 107
 108 static float meter_lineup(float offset) {
 109         return meter_lineup_cfg (UIConfiguration::instance().get_meter_line_up_level(), offset);
 110 }
 111
 112 static float vu_standard() {
 113         // note - default meter config is +2dB (france)
 114         switch (UIConfiguration::instance().get_meter_vu_standard()) {
 115                 default:
 116                 case MeteringVUfrench:   // 0VU = -2dBu
 117                         return 0;
 118                 case MeteringVUamerican: // 0VU =  0dBu
 119                         return -2;
 120                 case MeteringVUstandard: // 0VU = +4dBu
 121                         return -6;
 122                 case MeteringVUeight:    // 0VU = +8dBu
 123                         return -10;
 124         }
 125 }
 126
 127 float
 128 LevelMeterBase::update_meters ()
 129 {
 130         vector<MeterInfo>::iterator i;
 131         uint32_t n;
 132
 133         if (!_meter) {
 134                 return 0.0f;
 135         }
 136
 137         uint32_t nmidi = _meter->input_streams().n_midi();
 138
 139         for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 140                 if ((*i).packed) {
 141                         const float mpeak = _meter->meter_level(n, MeterMaxPeak);
 142                         if (mpeak > (*i).max_peak) {
 143                                 (*i).max_peak = mpeak;
 144                                 (*i).meter->set_highlight(mpeak >= UIConfiguration::instance().get_meter_peak());
 145                         }
 146                         if (mpeak > max_peak) {
 147                                 max_peak = mpeak;
 148                         }
 149
 150                         if (n < nmidi) {
 151                                 (*i).meter->set (_meter->meter_level (n, MeterPeak));
 152                         } else {
 153                                 const float peak = _meter->meter_level (n, meter_type);
 154                                 if (meter_type == MeterPeak) {
 155                                         (*i).meter->set (log_meter (peak));
 156                                 } else if (meter_type == MeterPeak0dB) {
 157                                         (*i).meter->set (log_meter0dB (peak));
 158                                 } else if (meter_type == MeterIEC1NOR) {
 159                                         (*i).meter->set (meter_deflect_nordic (peak + meter_lineup(0)));
 160                                 } else if (meter_type == MeterIEC1DIN) {
 161                                         (*i).meter->set (meter_deflect_din (peak + meter_lineup_cfg(UIConfiguration::instance().get_meter_line_up_din(), 3.0)));
 162                                 } else if (meter_type == MeterIEC2BBC || meter_type == MeterIEC2EBU) {
 163                                         (*i).meter->set (meter_deflect_ppm (peak + meter_lineup(0)));
 164                                 } else if (meter_type == MeterVU) {
 165                                         (*i).meter->set (meter_deflect_vu (peak + vu_standard() + meter_lineup(0)));
 166                                 } else if (meter_type == MeterK12) {
 167                                         (*i).meter->set (meter_deflect_k (peak, 12), meter_deflect_k(_meter->meter_level(n, MeterPeak), 12));
 168                                 } else if (meter_type == MeterK14) {
 169                                         (*i).meter->set (meter_deflect_k (peak, 14), meter_deflect_k(_meter->meter_level(n, MeterPeak), 14));
 170                                 } else if (meter_type == MeterK20) {
 171                                         (*i).meter->set (meter_deflect_k (peak, 20), meter_deflect_k(_meter->meter_level(n, MeterPeak), 20));
 172                                 } else { // RMS
 173                                         (*i).meter->set (log_meter (peak), log_meter(_meter->meter_level(n, MeterPeak)));
 174                                 }
 175                         }
 176                 }
 177         }
 178         return max_peak;
 179 }
 180
 181 void
 182 LevelMeterBase::parameter_changed (string p)
 183 {
 184         ENSURE_GUI_THREAD (*this, &LevelMeterBase::parameter_changed, p)
 185
 186         if (p == "meter-hold") {
 187                 vector<MeterInfo>::iterator i;
 188                 uint32_t n;
 189
 190                 for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 191                         (*i).meter->set_hold_count ((uint32_t) floor(UIConfiguration::instance().get_meter_hold()));
 192                 }
 193         }
 194         else if (p == "meter-line-up-level") {
 195                 color_changed = true;
 196                 setup_meters (meter_length, regular_meter_width, thin_meter_width);
 197         }
 198         else if (p == "meter-style-led") {
 199                 color_changed = true;
 200                 setup_meters (meter_length, regular_meter_width, thin_meter_width);
 201         }
 202         else if (p == "meter-peak") {
 203                 vector<MeterInfo>::iterator i;
 204                 uint32_t n;
 205
 206                 for (n = 0, i = meters.begin(); i != meters.end(); ++i, ++n) {
 207                         (*i).max_peak = minus_infinity();
 208                 }
 209         }
 210 }
 211
 212 void
 213 LevelMeterBase::configuration_changed (ChanCount /*in*/, ChanCount /*out*/)
 214 {
 215         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 216 }
 217
 218 void
 219 LevelMeterBase::meter_type_changed (MeterType t)
 220 {
 221         meter_type = t;
 222         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 223         MeterTypeChanged(t);
 224 }
 225
 226 void
 227 LevelMeterBase::hide_all_meters ()
 228 {
 229         for (vector<MeterInfo>::iterator i = meters.begin(); i != meters.end(); ++i) {
 230                 if ((*i).packed) {
 231                         mtr_remove (*((*i).meter));
 232                         (*i).packed = false;
 233                 }
 234         }
 235         meter_count = 0;
 236 }
 237
 238 void
 239 LevelMeterBase::set_max_audio_meter_count (uint32_t cnt)
 240 {
 241         if (cnt == max_visible_meters) {
 242                 return;
 243         }
 244         color_changed = true; // force re-setup
 245         max_visible_meters = cnt;
 246         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 247 }
 248
 249 void
 250 LevelMeterBase::setup_meters (int len, int initial_width, int thin_width)
 251 {
 252
 253         if (!_meter) {
 254                 hide_all_meters ();
 255                 return; /* do it later or never */
 256         }
 257
 258         uint32_t nmidi = _meter->input_streams().n_midi();
 259         uint32_t nmeters = _meter->input_streams().n_total();
 260         regular_meter_width = initial_width;
 261         thin_meter_width = thin_width;
 262         meter_length = len;
 263
 264         guint16 width;
 265
 266         if (nmeters == 0) {
 267                 hide_all_meters ();
 268                 return;
 269         }
 270
 271         if (nmeters <= 2) {
 272                 width = regular_meter_width;
 273         } else {
 274                 width = thin_meter_width;
 275         }
 276
 277         width = rint (width * UIConfiguration::instance().get_ui_scale());
 278
 279         if (   meters.size() > 0
 280             && nmidi == midi_count
 281             && nmeters == meter_count
 282             && meters[0].width == width
 283             && meters[0].length == len
 284             && !color_changed
 285             && meter_type == visible_meter_type) {
 286                 return;
 287         }
 288
 289 #if 0
 290         printf("Meter redraw: %s %s %s %s %s %s\n",
 291                         (meters.size() > 0) ? "yes" : "no",
 292                         (meters.size() > 0 &&  meters[0].width == width) ? "yes" : "no",
 293                         (meters.size() > 0 &&  meters[0].length == len) ? "yes" : "no",
 294                         (nmeters == meter_count) ? "yes" : "no",
 295                         (meter_type == visible_meter_type) ? "yes" : "no",
 296                         !color_changed ? "yes" : "no"
 297                         );
 298 #endif
 299
 300         hide_all_meters ();
 301         while (meters.size() < nmeters) {
 302                 meters.push_back (MeterInfo());
 303         }
 304
 305         //cerr << "LevelMeterBase::setup_meters() called color_changed = " << color_changed << " colors: " << endl;//DEBUG
 306
 307         for (int32_t n = nmeters-1; nmeters && n >= 0 ; --n) {
 308                 uint32_t c[10];
 309                 uint32_t b[4];
 310                 float stp[4];
 311                 int styleflags = UIConfiguration::instance().get_meter_style_led() ? 3 : 1;
 312                 b[0] = UIConfiguration::instance().color ("meter background bottom");
 313                 b[1] = UIConfiguration::instance().color ("meter background top");
 314                 b[2] = 0x991122ff; // red highlight gradient Bot
 315                 b[3] = 0x551111ff; // red highlight gradient Top
 316                 if ((uint32_t) n < nmidi) {
 317                         c[0] = UIConfiguration::instance().color ("midi meter color0");
 318                         c[1] = UIConfiguration::instance().color ("midi meter color1");
 319                         c[2] = UIConfiguration::instance().color ("midi meter color2");
 320                         c[3] = UIConfiguration::instance().color ("midi meter color3");
 321                         c[4] = UIConfiguration::instance().color ("midi meter color4");
 322                         c[5] = UIConfiguration::instance().color ("midi meter color5");
 323                         c[6] = UIConfiguration::instance().color ("midi meter color6");
 324                         c[7] = UIConfiguration::instance().color ("midi meter color7");
 325                         c[8] = UIConfiguration::instance().color ("midi meter color8");
 326                         c[9] = UIConfiguration::instance().color ("midi meter color9");
 327                         stp[0] = 115.0 *  32.0 / 128.0;
 328                         stp[1] = 115.0 *  64.0 / 128.0;
 329                         stp[2] = 115.0 * 100.0 / 128.0;
 330                         stp[3] = 115.0 * 112.0 / 128.0;
 331                 } else {
 332                         c[0] = UIConfiguration::instance().color ("meter color0");
 333                         c[1] = UIConfiguration::instance().color ("meter color1");
 334                         c[2] = UIConfiguration::instance().color ("meter color2");
 335                         c[3] = UIConfiguration::instance().color ("meter color3");
 336                         c[4] = UIConfiguration::instance().color ("meter color4");
 337                         c[5] = UIConfiguration::instance().color ("meter color5");
 338                         c[6] = UIConfiguration::instance().color ("meter color6");
 339                         c[7] = UIConfiguration::instance().color ("meter color7");
 340                         c[8] = UIConfiguration::instance().color ("meter color8");
 341                         c[9] = UIConfiguration::instance().color ("meter color9");
 342
 343                         switch (meter_type) {
 344                                 case MeterK20:
 345                                         stp[0] = 115.0 * meter_deflect_k(-40, 20);  //-20
 346                                         stp[1] = 115.0 * meter_deflect_k(-20, 20);  //  0
 347                                         stp[2] = 115.0 * meter_deflect_k(-18, 20);  // +2
 348                                         stp[3] = 115.0 * meter_deflect_k(-16, 20);  // +4
 349                                         c[0] = c[1] = 0x008800ff;
 350                                         c[2] = c[3] = 0x00ff00ff;
 351                                         c[4] = c[5] = 0xffff00ff;
 352                                         c[6] = c[7] = 0xffff00ff;
 353                                         c[8] = c[9] = 0xff0000ff;
 354                                         break;
 355                                 case MeterK14:
 356                                         stp[0] = 115.0 * meter_deflect_k(-34, 14);  //-20
 357                                         stp[1] = 115.0 * meter_deflect_k(-14, 14);  //  0
 358                                         stp[2] = 115.0 * meter_deflect_k(-12, 14);  // +2
 359                                         stp[3] = 115.0 * meter_deflect_k(-10, 14);  // +4
 360                                         c[0] = c[1] = 0x008800ff;
 361                                         c[2] = c[3] = 0x00ff00ff;
 362                                         c[4] = c[5] = 0xffff00ff;
 363                                         c[6] = c[7] = 0xffff00ff;
 364                                         c[8] = c[9] = 0xff0000ff;
 365                                         break;
 366                                 case MeterK12:
 367                                         stp[0] = 115.0 * meter_deflect_k(-32, 12);  //-20
 368                                         stp[1] = 115.0 * meter_deflect_k(-12, 12);  //  0
 369                                         stp[2] = 115.0 * meter_deflect_k(-10, 12);  // +2
 370                                         stp[3] = 115.0 * meter_deflect_k( -8, 12);  // +4
 371                                         c[0] = c[1] = 0x008800ff;
 372                                         c[2] = c[3] = 0x00ff00ff;
 373                                         c[4] = c[5] = 0xffff00ff;
 374                                         c[6] = c[7] = 0xffff00ff;
 375                                         c[8] = c[9] = 0xff0000ff;
 376                                         break;
 377                                 case MeterIEC2BBC:
 378                                         c[0] = c[1] = c[2] = c[3] = c[4] = c[5] = c[6] = c[7] = c[8] = c[9] =
 379                                                 UIConfiguration::instance().color ("meter color BBC");
 380                                         stp[0] = stp[1] = stp[2] = stp[3] = 115.0;
 381                                         break;
 382                                 case MeterIEC2EBU:
 383                                         stp[0] = 115.0 * meter_deflect_ppm(-24); // ignored
 384                                         stp[1] = 115.0 * meter_deflect_ppm(-18);
 385                                         stp[2] = 115.0 * meter_deflect_ppm( -9);
 386                                         stp[3] = 115.0 * meter_deflect_ppm(  0); // ignored
 387                                         c[3] = c[2] = c[1];
 388                                         c[6] = c[7] = c[8] = c[9];
 389                                         break;
 390                                 case MeterIEC1NOR:
 391                                         stp[0] = 115.0 * meter_deflect_nordic(-30); // ignored
 392                                         stp[1] = 115.0 * meter_deflect_nordic(-18);
 393                                         stp[2] = 115.0 * meter_deflect_nordic(-12);
 394                                         stp[3] = 115.0 * meter_deflect_nordic( -9); // ignored
 395                                         c[0] = c[1] = c[2]; // bright-green
 396                                         c[6] = c[7] = c[8] = c[9];
 397                                         break;
 398                                 case MeterIEC1DIN:
 399                                         stp[0] = 115.0 * meter_deflect_din(-29); // ignored
 400                                         stp[1] = 115.0 * meter_deflect_din(-18);
 401                                         stp[2] = 115.0 * meter_deflect_din(-15); // ignored
 402                                         stp[3] = 115.0 * meter_deflect_din( -9);
 403                                         c[0] = c[2] = c[3] = c[1];
 404                                         c[4] = c[6];
 405                                         c[5] = c[7];
 406                                         break;
 407                                 case MeterVU:
 408                                         stp[0] = 115.0 * meter_deflect_vu(-26); // -6
 409                                         stp[1] = 115.0 * meter_deflect_vu(-23); // -3
 410                                         stp[2] = 115.0 * meter_deflect_vu(-20); // 0
 411                                         stp[3] = 115.0 * meter_deflect_vu(-18); // +2
 412                                         c[0] = c[2] = c[3] = c[4] = c[5] = c[1];
 413                                         c[7] = c[8] = c[9] = c[6];
 414                                         break;
 415                                 case MeterPeak0dB:
 416                                          stp[1] =  89.125; // 115.0 * log_meter0dB(-9);
 417                                          stp[2] = 106.375; // 115.0 * log_meter0dB(-3);
 418                                          stp[3] = 115.0;   // 115.0 * log_meter0dB(0);
 419                                         switch (UIConfiguration::instance().get_meter_line_up_level()) {
 420                                         case MeteringLineUp24:
 421                                                 stp[0] = 115.0 * log_meter0dB(-24);
 422                                                 break;
 423                                         case MeteringLineUp20:
 424                                                 stp[0] = 115.0 * log_meter0dB(-20);
 425                                                 break;
 426                                         default:
 427                                         case MeteringLineUp18:
 428                                                 stp[0] = 115.0 * log_meter0dB(-18);
 429                                                 break;
 430                                         case MeteringLineUp15:
 431                                                 stp[0] = 115.0 * log_meter0dB(-15);
 432                                         }
 433                                         break;
 434                                 default: // PEAK, RMS
 435                                         stp[1] = 77.5;  // 115 * log_meter(-9)
 436                                         stp[2] = 92.5;  // 115 * log_meter(-3)
 437                                         stp[3] = 100.0; // 115 * log_meter(0)
 438                                         switch (UIConfiguration::instance().get_meter_line_up_level()) {
 439                                         case MeteringLineUp24:
 440                                                 stp[0] = 42.0;
 441                                                 break;
 442                                         case MeteringLineUp20:
 443                                                 stp[0] = 50.0;
 444                                                 break;
 445                                         default:
 446                                         case MeteringLineUp18:
 447                                                 stp[0] = 55.0;
 448                                                 break;
 449                                         case MeteringLineUp15:
 450                                                 stp[0] = 62.5;
 451                                                 break;
 452                                 }
 453                         }
 454                 }
 455                 if (meters[n].width != width || meters[n].length != len || color_changed || meter_type != visible_meter_type || nmidi != midi_count) {
 456                         bool hl = meters[n].meter ? meters[n].meter->get_highlight() : false;
 457                         meters[n].packed = false;
 458                         delete meters[n].meter;
 459                         meters[n].meter = new FastMeter ((uint32_t) floor (UIConfiguration::instance().get_meter_hold()), width, _meter_orientation, len,
 460                                         c[0], c[1], c[2], c[3], c[4],
 461                                         c[5], c[6], c[7], c[8], c[9],
 462                                         b[0], b[1], b[2], b[3],
 463                                         stp[0], stp[1], stp[2], stp[3],
 464                                         styleflags
 465                                         );
 466                         meters[n].meter->set_highlight(hl);
 467                         meters[n].width = width;
 468                         meters[n].length = len;
 469                         meters[n].meter->add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK);
 470                         meters[n].meter->signal_button_press_event().connect (sigc::mem_fun (*this, &LevelMeterBase::meter_button_press), false);
 471                         meters[n].meter->signal_button_release_event().connect (sigc::mem_fun (*this, &LevelMeterBase::meter_button_release), false);
 472                 }
 473
 474                 //pack_end (*meters[n].meter, false, false);
 475                 mtr_pack (*meters[n].meter);
 476                 meters[n].packed = true;
 477                 if (max_visible_meters == 0 || (uint32_t) n < max_visible_meters + nmidi) {
 478                         meters[n].meter->show_all ();
 479                 } else {
 480                         meters[n].meter->hide ();
 481                 }
 482         }
 483         //show();
 484         color_changed = false;
 485         visible_meter_type = meter_type;
 486         midi_count = nmidi;
 487         meter_count = nmeters;
 488 }
 489
 490 void
 491 LevelMeterBase::set_type(MeterType t)
 492 {
 493         meter_type = t;
 494         _meter->set_type(t);
 495 }
 496
 497 bool
 498 LevelMeterBase::meter_button_press (GdkEventButton* ev)
 499 {
 500         return static_cast<bool>(ButtonPress (ev)); /* EMIT SIGNAL */
 501 }
 502
 503 bool
 504 LevelMeterBase::meter_button_release (GdkEventButton* ev)
 505 {
 506         if (ev->button == 1) {
 507                 clear_meters (false);
 508         }
 509         ButtonRelease(ev);
 510
 511         return true;
 512 }
 513
 514
 515 void LevelMeterBase::clear_meters (bool reset_highlight)
 516 {
 517         for (vector<MeterInfo>::iterator i = meters.begin(); i < meters.end(); i++) {
 518                 (*i).meter->clear();
 519                 (*i).max_peak = minus_infinity();
 520                 if (reset_highlight)
 521                         (*i).meter->set_highlight(false);
 522         }
 523         max_peak = minus_infinity();
 524 }
 525
 526 void LevelMeterBase::hide_meters ()
 527 {
 528         hide_all_meters();
 529 }
 530
 531 void
 532 LevelMeterBase::color_handler ()
 533 {
 534         color_changed = true;
 535         setup_meters (meter_length, regular_meter_width, thin_meter_width);
 536 }
 537
 538 LevelMeterHBox::LevelMeterHBox(Session* s)
 539         : LevelMeterBase(s, invalidator(*this))
 540 {
 541         set_spacing(1);
 542         show();
 543 }
 544
 545
 546 LevelMeterHBox::~LevelMeterHBox() {}
 547
 548 void
 549 LevelMeterHBox::mtr_pack(Gtk::Widget &w) {
 550         pack_end (w, false, false);
 551 }
 552
 553 void
 554 LevelMeterHBox::mtr_remove(Gtk::Widget &w) {
 555         remove (w);
 556 }
 557
 558
 559 LevelMeterVBox::LevelMeterVBox(Session* s)
 560         : LevelMeterBase(s, invalidator(*this), FastMeter::Horizontal)
 561 {
 562         set_spacing(1);
 563         show();
 564 }
 565 LevelMeterVBox::~LevelMeterVBox() {}
 566
 567 void
 568 LevelMeterVBox::mtr_pack(Gtk::Widget &w) {
 569         pack_end (w, false, false);
 570 }
 571
 572 void
 573 LevelMeterVBox::mtr_remove(Gtk::Widget &w) {
 574         remove (w);
 575 }