git.sesse.net Git - nageru/blob - mainwindow.cpp

   1 #include "mainwindow.h"
   2
   3 #include <math.h>
   4 #include <stdio.h>
   5 #include <signal.h>
   6 #include <algorithm>
   7 #include <chrono>
   8 #include <string>
   9 #include <vector>
  10 #include <QBoxLayout>
  11 #include <QInputDialog>
  12 #include <QKeySequence>
  13 #include <QLabel>
  14 #include <QMessageBox>
  15 #include <QMetaType>
  16 #include <QPushButton>
  17 #include <QResizeEvent>
  18 #include <QShortcut>
  19 #include <QSize>
  20 #include <QString>
  21
  22 #include "aboutdialog.h"
  23 #include "disk_space_estimator.h"
  24 #include "flags.h"
  25 #include "glwidget.h"
  26 #include "input_mapping_dialog.h"
  27 #include "lrameter.h"
  28 #include "midi_mapping.pb.h"
  29 #include "midi_mapping_dialog.h"
  30 #include "mixer.h"
  31 #include "post_to_main_thread.h"
  32 #include "ui_audio_miniview.h"
  33 #include "ui_audio_expanded_view.h"
  34 #include "ui_display.h"
  35 #include "ui_mainwindow.h"
  36 #include "vumeter.h"
  37
  38 class QResizeEvent;
  39
  40 using namespace std;
  41 using namespace std::chrono;
  42 using namespace std::placeholders;
  43
  44 Q_DECLARE_METATYPE(std::string);
  45 Q_DECLARE_METATYPE(std::vector<std::string>);
  46
  47 MainWindow *global_mainwindow = nullptr;
  48
  49 namespace {
  50
  51 void schedule_cut_signal(int ignored)
  52 {
  53         global_mixer->schedule_cut();
  54 }
  55
  56 void quit_signal(int ignored)
  57 {
  58         global_mainwindow->close();
  59 }
  60
  61 void slave_knob(QDial *master, QDial *slave)
  62 {
  63         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  64                 slave->blockSignals(true);
  65                 slave->setValue(value);
  66                 slave->blockSignals(false);
  67         });
  68         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
  69                 master->setValue(value);
  70         });
  71 }
  72
  73 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
  74 {
  75         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
  76                 slave->blockSignals(true);
  77                 slave->setCheckState(Qt::CheckState(state));
  78                 slave->blockSignals(false);
  79         });
  80         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
  81                 master->setCheckState(Qt::CheckState(state));
  82         });
  83 }
  84
  85 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
  86 {
  87         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
  88                 slave->blockSignals(true);
  89                 slave->setDbValue(value);
  90                 slave->blockSignals(false);
  91         });
  92         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
  93                 master->setDbValue(value);
  94         });
  95 }
  96
  97 constexpr unsigned DB_NO_FLAGS = 0x0;
  98 constexpr unsigned DB_WITH_SIGN = 0x1;
  99 constexpr unsigned DB_BARE = 0x2;
 100
 101 string format_db(double db, unsigned flags)
 102 {
 103         string text;
 104         if (flags & DB_WITH_SIGN) {
 105                 if (isfinite(db)) {
 106                         char buf[256];
 107                         snprintf(buf, sizeof(buf), "%+.1f", db);
 108                         text = buf;
 109                 } else if (db < 0.0) {
 110                         text = "-∞";
 111                 } else {
 112                         // Should never happen, really.
 113                         text = "+∞";
 114                 }
 115         } else {
 116                 if (isfinite(db)) {
 117                         char buf[256];
 118                         snprintf(buf, sizeof(buf), "%.1f", db);
 119                         text = buf;
 120                 } else if (db < 0.0) {
 121                         text = "-∞";
 122                 } else {
 123                         // Should never happen, really.
 124                         text = "∞";
 125                 }
 126         }
 127         if (!(flags & DB_BARE)) {
 128                 text += " dB";
 129         }
 130         return text;
 131 }
 132
 133 void set_peak_label(QLabel *peak_label, float peak_db)
 134 {
 135         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 136
 137         // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
 138         // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
 139         if (peak_db > -0.1f) {
 140                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 141         } else {
 142                 peak_label->setStyleSheet("");
 143         }
 144 }
 145
 146 }  // namespace
 147
 148 MainWindow::MainWindow()
 149         : ui(new Ui::MainWindow), midi_mapper(this)
 150 {
 151         global_mainwindow = this;
 152         ui->setupUi(this);
 153
 154         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 155         disk_free_label = new QLabel(this);
 156         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 157         ui->menuBar->setCornerWidget(disk_free_label);
 158
 159         QActionGroup *audio_mapping_group = new QActionGroup(this);
 160         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 161         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 162
 163         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 164         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 165
 166         // The menus.
 167         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 168         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 169         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 170         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 171         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 172         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 173         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 174
 175         if (global_flags.x264_video_to_http) {
 176                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 177         } else {
 178                 ui->x264_bitrate_action->setEnabled(false);
 179         }
 180
 181         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 182         // TODO: Make them dynamic.
 183         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 184         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 185         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 186
 187         // Aiee...
 188         transition_btn1 = ui->transition_btn1;
 189         transition_btn2 = ui->transition_btn2;
 190         transition_btn3 = ui->transition_btn3;
 191         qRegisterMetaType<string>("std::string");
 192         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 193         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 194         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 195
 196         // Hook up the prev/next buttons on the audio views.
 197         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 198         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 199         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 200         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 201
 202         // And bind the same to PgUp/PgDown.
 203         auto switch_page = [this]{
 204                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 205                         ui->audio_views->setCurrentIndex(1 - ui->audio_views->currentIndex());
 206                 }
 207         };
 208         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, switch_page);
 209         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, switch_page);
 210
 211         last_audio_level_callback = steady_clock::now() - seconds(1);
 212
 213         if (!global_flags.midi_mapping_filename.empty()) {
 214                 MIDIMappingProto midi_mapping;
 215                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 216                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 217                                 global_flags.midi_mapping_filename.c_str());
 218                         exit(1);
 219                 }
 220                 midi_mapper.set_midi_mapping(midi_mapping);
 221         }
 222         midi_mapper.start_thread();
 223 }
 224
 225 void MainWindow::resizeEvent(QResizeEvent* event)
 226 {
 227         QMainWindow::resizeEvent(event);
 228
 229         // Ask for a relayout, but only after the event loop is done doing relayout
 230         // on everything else.
 231         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 232 }
 233
 234 void MainWindow::mixer_created(Mixer *mixer)
 235 {
 236         // Make the previews.
 237         unsigned num_previews = mixer->get_num_channels();
 238
 239         for (unsigned i = 0; i < num_previews; ++i) {
 240                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 241
 242                 QWidget *preview = new QWidget(this);
 243                 Ui::Display *ui_display = new Ui::Display;
 244                 ui_display->setupUi(preview);
 245                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 246                 ui_display->display->set_output(output);
 247                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 248                 previews.push_back(ui_display);
 249
 250                 // Hook up the click.
 251                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 252
 253                 // Let the theme update the text whenever the resolution or color changed.
 254                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 255                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 256
 257                 // Hook up the keyboard key.
 258                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 259                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 260
 261                 // Hook up the white balance button (irrelevant if invisible).
 262                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 263                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 264         }
 265
 266         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 267
 268         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 269         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 270         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 271         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 272         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 273
 274         reset_audio_mapping_ui();
 275
 276         // TODO: Fetch all of the values these for completeness,
 277         // not just the enable knobs implied by flags.
 278         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 279         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 280
 281         // Controls used only for simple audio fetch their state from the first bus.
 282         constexpr unsigned simple_bus_index = 0;
 283         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 284                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 285                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 286                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 287                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 288                 ui->compressor_threshold_db_display->setText(
 289                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 290         }
 291         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 292                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 293         });
 294         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 295                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 296         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 297                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 298         });
 299         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 300                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 301         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 302                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 303         });
 304
 305         // Global mastering controls.
 306         QString limiter_threshold_label(
 307                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 308         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 309         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 310
 311         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 312         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 313
 314         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 315         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 316                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 317         });
 318
 319         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 320         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 321                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 322         });
 323         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 324         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 325
 326         struct sigaction act;
 327         memset(&act, 0, sizeof(act));
 328         act.sa_handler = schedule_cut_signal;
 329         act.sa_flags = SA_RESTART;
 330         sigaction(SIGHUP, &act, nullptr);
 331
 332         // Mostly for debugging. Don't override SIGINT, that's so evil if
 333         // shutdown isn't instant.
 334         memset(&act, 0, sizeof(act));
 335         act.sa_handler = quit_signal;
 336         act.sa_flags = SA_RESTART;
 337         sigaction(SIGUSR1, &act, nullptr);
 338 }
 339
 340 void MainWindow::reset_audio_mapping_ui()
 341 {
 342         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 343
 344         ui->simple_audio_mode->setChecked(simple);
 345         ui->multichannel_audio_mode->setChecked(!simple);
 346         ui->input_mapping_action->setEnabled(!simple);
 347         ui->midi_mapping_action->setEnabled(!simple);
 348
 349         ui->locut_enabled->setVisible(simple);
 350         ui->gainstaging_label->setVisible(simple);
 351         ui->gainstaging_knob->setVisible(simple);
 352         ui->gainstaging_db_display->setVisible(simple);
 353         ui->gainstaging_auto_checkbox->setVisible(simple);
 354         ui->compressor_threshold_label->setVisible(simple);
 355         ui->compressor_threshold_knob->setVisible(simple);
 356         ui->compressor_threshold_db_display->setVisible(simple);
 357         ui->compressor_enabled->setVisible(simple);
 358
 359         setup_audio_miniview();
 360         setup_audio_expanded_view();
 361
 362         if (simple) {
 363                 ui->audio_views->setCurrentIndex(0);
 364         }
 365         ui->compact_header->setVisible(!simple);
 366 }
 367
 368 void MainWindow::setup_audio_miniview()
 369 {
 370         // Remove any existing channels.
 371         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 372                 delete item->widget();
 373                 delete item;
 374         }
 375         audio_miniviews.clear();
 376
 377         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 378                 return;
 379         }
 380
 381         // Set up brand new ones from the input mapping.
 382         InputMapping mapping = global_audio_mixer->get_input_mapping();
 383         audio_miniviews.resize(mapping.buses.size());
 384         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 385                 QWidget *channel = new QWidget(this);
 386                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 387                 ui_audio_miniview->setupUi(channel);
 388                 ui_audio_miniview->bus_desc_label->setFullText(
 389                         QString::fromStdString(mapping.buses[bus_index].name));
 390                 audio_miniviews[bus_index] = ui_audio_miniview;
 391
 392                 // Set up the peak meter.
 393                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 394                 peak_meter->set_min_level(-30.0f);
 395                 peak_meter->set_max_level(0.0f);
 396                 peak_meter->set_ref_level(0.0f);
 397
 398                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 399
 400                 ui->faders->addWidget(channel);
 401
 402                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 403                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 404                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 405                         [bus_index]() {
 406                                 global_audio_mixer->reset_peak(bus_index);
 407                         });
 408         }
 409 }
 410
 411 void MainWindow::setup_audio_expanded_view()
 412 {
 413         // Remove any existing channels.
 414         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 415                 delete item->widget();
 416                 delete item;
 417         }
 418         audio_expanded_views.clear();
 419
 420         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 421                 return;
 422         }
 423
 424         // Set up brand new ones from the input mapping.
 425         InputMapping mapping = global_audio_mixer->get_input_mapping();
 426         audio_expanded_views.resize(mapping.buses.size());
 427         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 428                 QWidget *channel = new QWidget(this);
 429                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 430                 ui_audio_expanded_view->setupUi(channel);
 431                 ui_audio_expanded_view->bus_desc_label->setFullText(
 432                         QString::fromStdString(mapping.buses[bus_index].name));
 433                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 434                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 435                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 436                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 437                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 438                 ui->buses->addWidget(channel);
 439
 440                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 441                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 442                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 443                 });
 444
 445                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 446                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 447                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 448                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 449                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 450                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 451
 452                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 453                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 454                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 455
 456                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 457                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 458                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 459                 });
 460
 461                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 462                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 463                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 464                 });
 465
 466                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 467
 468                 // Set up the peak meter.
 469                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 470                 peak_meter->set_min_level(-30.0f);
 471                 peak_meter->set_max_level(0.0f);
 472                 peak_meter->set_ref_level(0.0f);
 473
 474                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 475                         [bus_index]() {
 476                                 global_audio_mixer->reset_peak(bus_index);
 477                         });
 478
 479                 // Set up the compression attenuation meter.
 480                 VUMeter *reduction_meter = ui_audio_expanded_view->reduction_meter;
 481                 reduction_meter->set_min_level(0.0f);
 482                 reduction_meter->set_max_level(10.0f);
 483                 reduction_meter->set_ref_level(0.0f);
 484                 reduction_meter->set_flip(true);
 485         }
 486
 487         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 488 }
 489
 490 void MainWindow::mixer_shutting_down()
 491 {
 492         ui->me_live->clean_context();
 493         ui->me_preview->clean_context();
 494         for (Ui::Display *display : previews) {
 495                 display->display->clean_context();
 496         }
 497 }
 498
 499 void MainWindow::cut_triggered()
 500 {
 501         global_mixer->schedule_cut();
 502 }
 503
 504 void MainWindow::x264_bitrate_triggered()
 505 {
 506         bool ok;
 507         int new_bitrate = QInputDialog::getInt(this, "Change x264 bitrate", "Choose new bitrate for x264 HTTP output (from 100–100,000 kbit/sec):", global_flags.x264_bitrate, /*min=*/100, /*max=*/100000, /*step=*/100, &ok);
 508         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 509                 global_flags.x264_bitrate = new_bitrate;
 510                 global_mixer->change_x264_bitrate(new_bitrate);
 511         }
 512 }
 513
 514 void MainWindow::exit_triggered()
 515 {
 516         close();
 517 }
 518
 519 void MainWindow::about_triggered()
 520 {
 521         AboutDialog().exec();
 522 }
 523
 524 void MainWindow::simple_audio_mode_triggered()
 525 {
 526         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 527                 return;
 528         }
 529         unsigned card_index = global_audio_mixer->get_simple_input();
 530         if (card_index == numeric_limits<unsigned>::max()) {
 531                 QMessageBox::StandardButton reply =
 532                         QMessageBox::question(this,
 533                                 "Mapping too complex",
 534                                 "The current audio mapping is too complicated to be representable in simple mode, "
 535                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 536                                 QMessageBox::Yes | QMessageBox::No);
 537                 if (reply == QMessageBox::No) {
 538                         ui->simple_audio_mode->setChecked(false);
 539                         ui->multichannel_audio_mode->setChecked(true);
 540                         return;
 541                 }
 542                 card_index = 0;
 543         }
 544         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 545         reset_audio_mapping_ui();
 546 }
 547
 548 void MainWindow::multichannel_audio_mode_triggered()
 549 {
 550         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 551                 return;
 552         }
 553
 554         // Take the generated input mapping from the simple input,
 555         // and set it as a normal multichannel mapping, which causes
 556         // the mode to go to multichannel.
 557         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 558         reset_audio_mapping_ui();
 559 }
 560
 561 void MainWindow::input_mapping_triggered()
 562 {
 563         if (InputMappingDialog().exec() == QDialog::Accepted) {
 564                 setup_audio_miniview();
 565                 setup_audio_expanded_view();
 566         }
 567 }
 568
 569 void MainWindow::midi_mapping_triggered()
 570 {
 571         MIDIMappingDialog(&midi_mapper).exec();
 572 }
 573
 574 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 575 {
 576         if (bus_index == 0) {
 577                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 578         }
 579         if (bus_index < audio_expanded_views.size()) {
 580                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 581         }
 582
 583         float gain_db = value * 0.1f;
 584         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 585
 586         // The label will be updated by the audio level callback.
 587 }
 588
 589 void MainWindow::final_makeup_gain_knob_changed(int value)
 590 {
 591         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 592
 593         float gain_db = value * 0.1f;
 594         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 595
 596         // The label will be updated by the audio level callback.
 597 }
 598
 599 void MainWindow::cutoff_knob_changed(int value)
 600 {
 601         float octaves = value * 0.1f;
 602         float cutoff_hz = 20.0 * pow(2.0, octaves);
 603         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 604         update_cutoff_labels(cutoff_hz);
 605 }
 606
 607 void MainWindow::update_cutoff_labels(float cutoff_hz)
 608 {
 609         char buf[256];
 610         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 611         ui->locut_cutoff_display->setText(buf);
 612         ui->locut_cutoff_display_2->setText(buf);
 613
 614         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 615                 audio_expanded_views[bus_index]->locut_enabled->setText(
 616                         QString("Lo-cut: ") + buf);
 617         }
 618 }
 619
 620 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 621 {
 622         char time_str[256];
 623         if (estimated_seconds_left < 60.0) {
 624                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 625         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 626                 int s = lrintf(estimated_seconds_left);
 627                 int m = s / 60;
 628                 s %= 60;
 629                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 630         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 631                 int m = lrintf(estimated_seconds_left / 60.0);
 632                 snprintf(time_str, sizeof(time_str), "%dm", m);
 633         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 634                 int m = lrintf(estimated_seconds_left / 60.0);
 635                 int h = m / 60;
 636                 m %= 60;
 637                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 638         } else {  // More than ten hours: Xh.
 639                 int h = lrintf(estimated_seconds_left / 3600.0);
 640                 snprintf(time_str, sizeof(time_str), "%dh", h);
 641         }
 642         char buf[256];
 643         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 644
 645         std::string label = buf;
 646
 647         post_to_main_thread([this, label]{
 648                 disk_free_label->setText(QString::fromStdString(label));
 649                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 650         });
 651 }
 652
 653 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 654 {
 655         float gain_db = value * 0.1f;
 656         global_audio_mixer->set_eq(bus_index, band, gain_db);
 657
 658         update_eq_label(bus_index, band, gain_db);
 659 }
 660
 661 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 662 {
 663         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 664         string db_string = format_db(gain_db, DB_WITH_SIGN);
 665         switch (band) {
 666         case EQ_BAND_TREBLE:
 667                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 668                 break;
 669         case EQ_BAND_MID:
 670                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 671                 break;
 672         case EQ_BAND_BASS:
 673                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 674                 break;
 675         default:
 676                 assert(false);
 677         }
 678 }
 679
 680 void MainWindow::limiter_threshold_knob_changed(int value)
 681 {
 682         float threshold_dbfs = value * 0.1f;
 683         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 684         ui->limiter_threshold_db_display->setText(
 685                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 686         ui->limiter_threshold_db_display_2->setText(
 687                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 688 }
 689
 690 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 691 {
 692         float threshold_dbfs = value * 0.1f;
 693         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 694
 695         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 696         if (bus_index == 0) {
 697                 ui->compressor_threshold_db_display->setText(label);
 698         }
 699         if (bus_index < audio_expanded_views.size()) {
 700                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 701         }
 702 }
 703
 704 void MainWindow::mini_fader_changed(int bus, double volume_db)
 705 {
 706         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 707         audio_miniviews[bus]->fader_label->setText(label);
 708         audio_expanded_views[bus]->fader_label->setText(label);
 709
 710         global_audio_mixer->set_fader_volume(bus, volume_db);
 711 }
 712
 713 void MainWindow::reset_meters_button_clicked()
 714 {
 715         global_audio_mixer->reset_meters();
 716         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 717         ui->peak_display->setStyleSheet("");
 718 }
 719
 720 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 721                                       float global_level_lufs,
 722                                       float range_low_lufs, float range_high_lufs,
 723                                       float final_makeup_gain_db,
 724                                       float correlation)
 725 {
 726         steady_clock::time_point now = steady_clock::now();
 727
 728         // The meters are somewhat inefficient to update. Only update them
 729         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 730         // means that the digital peak meters are ever so slightly too low
 731         // (each update won't be a faithful representation of the highest peak
 732         // since the previous update, since there are frames we won't draw),
 733         // but the _peak_ of the peak meters will be correct (it's tracked in
 734         // AudioMixer, not here), and that's much more important.
 735         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 736         if (last_update_age < 0.100) {
 737                 return;
 738         }
 739         last_audio_level_callback = now;
 740
 741         post_to_main_thread([=]() {
 742                 ui->vu_meter->set_level(level_lufs);
 743                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 744                         if (bus_index < audio_miniviews.size()) {
 745                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 746                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 747                                 miniview->peak_meter->set_level(
 748                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 749                                 miniview->peak_meter->set_peak(
 750                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 751                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 752
 753                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 754                                 view->peak_meter->set_level(
 755                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 756                                 view->peak_meter->set_peak(
 757                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 758                                 view->reduction_meter->set_level(level.compressor_attenuation_db);
 759                                 view->gainstaging_knob->blockSignals(true);
 760                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 761                                 view->gainstaging_knob->blockSignals(false);
 762                                 view->gainstaging_db_display->setText(
 763                                         QString("Gain: ") +
 764                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 765                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 766                         }
 767                 }
 768                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 769                 ui->correlation_meter->set_correlation(correlation);
 770
 771                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 772                 set_peak_label(ui->peak_display, peak_db);
 773
 774                 // NOTE: Will be invisible when using multitrack audio.
 775                 ui->gainstaging_knob->blockSignals(true);
 776                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 777                 ui->gainstaging_knob->blockSignals(false);
 778                 ui->gainstaging_db_display->setText(
 779                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 780
 781                 ui->makeup_gain_knob->blockSignals(true);
 782                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 783                 ui->makeup_gain_knob->blockSignals(false);
 784                 ui->makeup_gain_db_display->setText(
 785                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 786                 ui->makeup_gain_db_display_2->setText(
 787                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 788         });
 789 }
 790
 791 void MainWindow::relayout()
 792 {
 793         int height = ui->vertical_layout->geometry().height();
 794
 795         double remaining_height = height;
 796
 797         // Allocate the height; the most important part is to keep the main displays
 798         // at 16:9 if at all possible.
 799         double me_width = ui->me_preview->width();
 800         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 801
 802         // TODO: Scale the widths when we need to do this.
 803         if (me_height / double(height) > 0.8) {
 804                 me_height = height * 0.8;
 805         }
 806         remaining_height -= me_height + ui->vertical_layout->spacing();
 807
 808         // Space between the M/E displays and the audio strip.
 809         remaining_height -= ui->vertical_layout->spacing();
 810
 811         // The label above the audio strip.
 812         double compact_label_height = ui->compact_label->minimumHeight() +
 813                 ui->compact_audio_layout->spacing();
 814         remaining_height -= compact_label_height;
 815
 816         // The previews will be constrained by the remaining height, and the width.
 817         double preview_label_height = previews[0]->title_bar->geometry().height() +
 818                 previews[0]->main_vertical_layout->spacing();
 819         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 820         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 821         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 822
 823         ui->vertical_layout->setStretch(0, lrintf(me_height));
 824         ui->vertical_layout->setStretch(1,
 825                 lrintf(compact_label_height) +
 826                 lrintf(remaining_height) +
 827                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 828
 829         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 830         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 831         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 832
 833         // Set the widths for the previews.
 834         double preview_width = preview_height * 16.0 / 9.0;
 835         for (unsigned i = 0; i < previews.size(); ++i) {
 836                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 837         }
 838
 839         // The preview horizontal spacer.
 840         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 841         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 842 }
 843
 844 void MainWindow::set_locut(float value)
 845 {
 846         set_relative_value(ui->locut_cutoff_knob, value);
 847 }
 848
 849 void MainWindow::set_limiter_threshold(float value)
 850 {
 851         set_relative_value(ui->limiter_threshold_knob, value);
 852 }
 853
 854 void MainWindow::set_makeup_gain(float value)
 855 {
 856         set_relative_value(ui->makeup_gain_knob, value);
 857 }
 858
 859 void MainWindow::set_treble(unsigned bus_idx, float value)
 860 {
 861         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
 862 }
 863
 864 void MainWindow::set_mid(unsigned bus_idx, float value)
 865 {
 866         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
 867 }
 868
 869 void MainWindow::set_bass(unsigned bus_idx, float value)
 870 {
 871         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
 872 }
 873
 874 void MainWindow::set_gain(unsigned bus_idx, float value)
 875 {
 876         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
 877 }
 878
 879 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
 880 {
 881         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
 882 }
 883
 884 void MainWindow::set_fader(unsigned bus_idx, float value)
 885 {
 886         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
 887 }
 888
 889 void MainWindow::toggle_locut(unsigned bus_idx)
 890 {
 891         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
 892 }
 893
 894 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
 895 {
 896         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
 897 }
 898
 899 void MainWindow::toggle_compressor(unsigned bus_idx)
 900 {
 901         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
 902 }
 903
 904 void MainWindow::clear_peak(unsigned bus_idx)
 905 {
 906         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 907                 global_audio_mixer->reset_peak(bus_idx);
 908         }
 909 }
 910
 911 template<class T>
 912 void MainWindow::set_relative_value(T *control, float value)
 913 {
 914         post_to_main_thread([control, value]{
 915                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
 916         });
 917 }
 918
 919 template<class T>
 920 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
 921 {
 922         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
 923             bus_idx < audio_expanded_views.size()) {
 924                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
 925         }
 926 }
 927
 928 template<class T>
 929 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
 930 {
 931         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
 932             bus_idx < audio_expanded_views.size()) {
 933                 (audio_expanded_views[bus_idx]->*control)->click();
 934         }
 935 }
 936
 937 void MainWindow::set_transition_names(vector<string> transition_names)
 938 {
 939         if (transition_names.size() < 1 || transition_names[0].empty()) {
 940                 transition_btn1->setText(QString(""));
 941         } else {
 942                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
 943                 ui->transition_btn1->setShortcut(QKeySequence("J"));
 944         }
 945         if (transition_names.size() < 2 || transition_names[1].empty()) {
 946                 transition_btn2->setText(QString(""));
 947         } else {
 948                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
 949                 ui->transition_btn2->setShortcut(QKeySequence("K"));
 950         }
 951         if (transition_names.size() < 3 || transition_names[2].empty()) {
 952                 transition_btn3->setText(QString(""));
 953         } else {
 954                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
 955                 ui->transition_btn3->setShortcut(QKeySequence("L"));
 956         }
 957 }
 958
 959 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
 960 {
 961         if (output >= Mixer::OUTPUT_INPUT0) {
 962                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 963                 previews[channel]->label->setText(name.c_str());
 964         }
 965 }
 966
 967 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
 968 {
 969         if (output >= Mixer::OUTPUT_INPUT0) {
 970                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 971                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
 972         }
 973 }
 974
 975 void MainWindow::transition_clicked(int transition_number)
 976 {
 977         global_mixer->transition_clicked(transition_number);
 978 }
 979
 980 void MainWindow::channel_clicked(int channel_number)
 981 {
 982         if (current_wb_pick_display == channel_number) {
 983                 // The picking was already done from eventFilter(), since we don't get
 984                 // the mouse pointer here.
 985         } else {
 986                 global_mixer->channel_clicked(channel_number);
 987         }
 988 }
 989
 990 void MainWindow::wb_button_clicked(int channel_number)
 991 {
 992         current_wb_pick_display = channel_number;
 993         QApplication::setOverrideCursor(Qt::CrossCursor);
 994 }
 995
 996 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 997 {
 998         if (current_wb_pick_display != -1 &&
 999             event->type() == QEvent::MouseButtonRelease &&
1000             watched->isWidgetType()) {
1001                 QApplication::restoreOverrideCursor();
1002                 if (watched == previews[current_wb_pick_display]->display) {
1003                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1004                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1005                 } else {
1006                         // The user clicked on something else, give up.
1007                         // (The click goes through, which might not be ideal, but, yes.)
1008                         current_wb_pick_display = -1;
1009                 }
1010         }
1011         return false;
1012 }
1013
1014 namespace {
1015
1016 double srgb_to_linear(double x)
1017 {
1018         if (x < 0.04045) {
1019                 return x / 12.92;
1020         } else {
1021                 return pow((x + 0.055) / 1.055, 2.4);
1022         }
1023 }
1024
1025 }  // namespace
1026
1027 void MainWindow::set_white_balance(int channel_number, int x, int y)
1028 {
1029         // Set the white balance to neutral for the grab. It's probably going to
1030         // flicker a bit, but hopefully this display is not live anyway.
1031         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1032         previews[channel_number]->display->updateGL();
1033         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1034
1035         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1036         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1037         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1038         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1039         previews[channel_number]->display->updateGL();
1040 }
1041
1042 void MainWindow::audio_state_changed()
1043 {
1044         post_to_main_thread([this]{
1045                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1046                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1047                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1048                         string suffix;
1049                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1050                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1051                                 if (state == ALSAPool::Device::State::STARTING) {
1052                                         suffix = " (busy)";
1053                                 } else if (state == ALSAPool::Device::State::DEAD) {
1054                                         suffix = " (dead)";
1055                                 }
1056                         }
1057
1058                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1059                                 QString::fromStdString(bus.name + suffix));
1060                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1061                                 QString::fromStdString(bus.name + suffix));
1062                 }
1063         });
1064 }