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

   1 #include "mainwindow.h"
   2
   3 #include <assert.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <QAbstractButton>
   9 #include <QAbstractSlider>
  10 #include <QAction>
  11 #include <QActionGroup>
  12 #include <QApplication>
  13 #include <QBoxLayout>
  14 #include <QCheckBox>
  15 #include <QDesktopServices>
  16 #include <QDial>
  17 #include <QDialog>
  18 #include <QEvent>
  19 #include <QFlags>
  20 #include <QFrame>
  21 #include <QImage>
  22 #include <QInputDialog>
  23 #include <QKeySequence>
  24 #include <QLabel>
  25 #include <QLayoutItem>
  26 #include <QMenuBar>
  27 #include <QMessageBox>
  28 #include <QMouseEvent>
  29 #include <QObject>
  30 #include <QPushButton>
  31 #include <QRect>
  32 #include <QRgb>
  33 #include <QShortcut>
  34 #include <QStackedWidget>
  35 #include <QToolButton>
  36 #include <QWidget>
  37 #include <algorithm>
  38 #include <chrono>
  39 #include <cmath>
  40 #include <functional>
  41 #include <limits>
  42 #include <memory>
  43 #include <ratio>
  44 #include <string>
  45 #include <vector>
  46
  47 #include "shared/aboutdialog.h"
  48 #include "alsa_pool.h"
  49 #include "analyzer.h"
  50 #include "clickable_label.h"
  51 #include "context_menus.h"
  52 #include "correlation_meter.h"
  53 #include "shared/disk_space_estimator.h"
  54 #include "ellipsis_label.h"
  55 #include "flags.h"
  56 #include "glwidget.h"
  57 #include "input_mapping.h"
  58 #include "input_mapping_dialog.h"
  59 #include "lrameter.h"
  60 #include "nageru_midi_mapping.pb.h"
  61 #include "midi_mapping_dialog.h"
  62 #include "mixer.h"
  63 #include "nonlinear_fader.h"
  64 #include "shared/post_to_main_thread.h"
  65 #include "ui_audio_expanded_view.h"
  66 #include "ui_audio_miniview.h"
  67 #include "ui_display.h"
  68 #include "ui_mainwindow.h"
  69 #include "vumeter.h"
  70
  71 using namespace std;
  72 using namespace std::chrono;
  73 using namespace std::placeholders;
  74
  75 Q_DECLARE_METATYPE(std::string);
  76 Q_DECLARE_METATYPE(std::vector<std::string>);
  77
  78 MainWindow *global_mainwindow = nullptr;
  79
  80 // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
  81 // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
  82 constexpr float peak_limit_dbfs = -0.1f;
  83
  84 namespace {
  85
  86 void schedule_cut_signal(int ignored)
  87 {
  88         global_mixer->schedule_cut();
  89 }
  90
  91 void quit_signal(int ignored)
  92 {
  93         global_mainwindow->close();
  94 }
  95
  96 void slave_knob(QDial *master, QDial *slave)
  97 {
  98         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  99                 slave->blockSignals(true);
 100                 slave->setValue(value);
 101                 slave->blockSignals(false);
 102         });
 103         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
 104                 master->setValue(value);
 105         });
 106 }
 107
 108 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
 109 {
 110         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
 111                 slave->blockSignals(true);
 112                 slave->setCheckState(Qt::CheckState(state));
 113                 slave->blockSignals(false);
 114         });
 115         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
 116                 master->setCheckState(Qt::CheckState(state));
 117         });
 118 }
 119
 120 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
 121 {
 122         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
 123                 slave->blockSignals(true);
 124                 slave->setDbValue(value);
 125                 slave->blockSignals(false);
 126         });
 127         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
 128                 master->setDbValue(value);
 129         });
 130 }
 131
 132 constexpr unsigned DB_WITH_SIGN = 0x1;
 133 constexpr unsigned DB_BARE = 0x2;
 134
 135 string format_db(double db, unsigned flags)
 136 {
 137         string text;
 138         if (flags & DB_WITH_SIGN) {
 139                 if (isfinite(db)) {
 140                         char buf[256];
 141                         snprintf(buf, sizeof(buf), "%+.1f", db);
 142                         text = buf;
 143                 } else if (db < 0.0) {
 144                         text = "-∞";
 145                 } else {
 146                         // Should never happen, really.
 147                         text = "+∞";
 148                 }
 149         } else {
 150                 if (isfinite(db)) {
 151                         char buf[256];
 152                         snprintf(buf, sizeof(buf), "%.1f", db);
 153                         text = buf;
 154                 } else if (db < 0.0) {
 155                         text = "-∞";
 156                 } else {
 157                         // Should never happen, really.
 158                         text = "∞";
 159                 }
 160         }
 161         if (!(flags & DB_BARE)) {
 162                 text += " dB";
 163         }
 164         return text;
 165 }
 166
 167 void set_peak_label(QLabel *peak_label, float peak_db)
 168 {
 169         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 170
 171         if (peak_db > peak_limit_dbfs) {
 172                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 173         } else {
 174                 peak_label->setStyleSheet("");
 175         }
 176 }
 177
 178 string get_bus_desc_label(const InputMapping::Bus &bus)
 179 {
 180         string suffix;
 181         if (bus.device.type == InputSourceType::ALSA_INPUT) {
 182                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
 183                 if (state == ALSAPool::Device::State::STARTING) {
 184                         suffix = " (busy)";
 185                 } else if (state == ALSAPool::Device::State::DEAD) {
 186                         suffix = " (dead)";
 187                 }
 188         }
 189
 190         return bus.name + suffix;
 191 }
 192
 193 }  // namespace
 194
 195 MainWindow::MainWindow()
 196         : ui(new Ui::MainWindow), midi_mapper(this)
 197 {
 198         global_mainwindow = this;
 199         ui->setupUi(this);
 200
 201         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2, _3));
 202         disk_free_label = new QLabel(this);
 203         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 204         ui->menuBar->setCornerWidget(disk_free_label);
 205
 206         QActionGroup *audio_mapping_group = new QActionGroup(this);
 207         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 208         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 209
 210         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 211         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 212
 213         // The menus.
 214         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 215         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 216         connect(ui->manual_action, &QAction::triggered, this, &MainWindow::manual_triggered);
 217         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 218         connect(ui->open_analyzer_action, &QAction::triggered, this, &MainWindow::open_analyzer_triggered);
 219         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 220         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 221         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 222         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 223         connect(ui->timecode_stream_action, &QAction::triggered, this, &MainWindow::timecode_stream_triggered);
 224         connect(ui->timecode_stdout_action, &QAction::triggered, this, &MainWindow::timecode_stdout_triggered);
 225
 226         ui->timecode_stream_action->setChecked(global_flags.display_timecode_in_stream);
 227         ui->timecode_stdout_action->setChecked(global_flags.display_timecode_on_stdout);
 228
 229         if (global_flags.x264_video_to_http && isinf(global_flags.x264_crf)) {
 230                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 231         } else {
 232                 ui->x264_bitrate_action->setEnabled(false);
 233         }
 234
 235         connect(ui->video_menu, &QMenu::aboutToShow, [this]{
 236                 fill_hdmi_sdi_output_device_menu(ui->hdmi_sdi_output_device_menu);
 237                 fill_hdmi_sdi_output_resolution_menu(ui->hdmi_sdi_output_resolution_menu);
 238         });
 239
 240         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 241         // TODO: Make them dynamic.
 242         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 243         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 244         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 245
 246         // Aiee...
 247         transition_btn1 = ui->transition_btn1;
 248         transition_btn2 = ui->transition_btn2;
 249         transition_btn3 = ui->transition_btn3;
 250         qRegisterMetaType<string>("std::string");
 251         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 252         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 253         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 254
 255         connect(ui->me_live, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 256         connect(ui->me_preview, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 257
 258         // Hook up the prev/next buttons on the audio views.
 259         connect(ui->compact_prev_page, &QAbstractButton::clicked, this, &MainWindow::prev_page);
 260         connect(ui->compact_next_page, &QAbstractButton::clicked, this, &MainWindow::next_page);
 261         connect(ui->full_prev_page, &QAbstractButton::clicked, this, &MainWindow::prev_page);
 262         connect(ui->full_next_page, &QAbstractButton::clicked, this, &MainWindow::next_page);
 263         connect(ui->video_grid_prev_page, &QAbstractButton::clicked, this, &MainWindow::prev_page);
 264         connect(ui->video_grid_next_page, &QAbstractButton::clicked, this, &MainWindow::next_page);
 265
 266         // And bind the same to PgUp/PgDown.
 267         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, this, &MainWindow::next_page);
 268         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, this, &MainWindow::prev_page);
 269
 270         // When the audio view changes, move the previews.
 271         connect(ui->audio_views, &QStackedWidget::currentChanged, bind(&MainWindow::audio_view_changed, this, _1));
 272
 273         if (global_flags.enable_quick_cut_keys) {
 274                 ui->quick_cut_enable_action->setChecked(true);
 275         }
 276         connect(ui->quick_cut_enable_action, &QAction::changed, [this](){
 277                 global_flags.enable_quick_cut_keys = ui->quick_cut_enable_action->isChecked();
 278         });
 279
 280 #if HAVE_SRT
 281         if (global_flags.srt_port >= 0) {
 282                 char title[256];
 283                 snprintf(title, sizeof(title), "Accept new SRT connections on port %d", global_flags.srt_port);
 284                 ui->srt_enable_action->setChecked(true);
 285                 ui->srt_enable_action->setText(title);
 286                 connect(ui->srt_enable_action, &QAction::changed, [this](){
 287                         global_flags.enable_srt = ui->srt_enable_action->isChecked();
 288                 });
 289         } else {
 290                 ui->srt_enable_action->setChecked(false);
 291                 ui->srt_enable_action->setEnabled(false);
 292                 ui->srt_enable_action->setText("Accept new SRT connections");
 293         }
 294 #else
 295         ui->srt_enable_action->setChecked(false);
 296         ui->srt_enable_action->setEnabled(false);
 297         ui->srt_enable_action->setText("Accept new SRT connections");
 298 #endif
 299
 300         last_audio_level_callback = steady_clock::now() - seconds(1);
 301
 302         if (!global_flags.midi_mapping_filename.empty()) {
 303                 MIDIMappingProto midi_mapping;
 304                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 305                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 306                                 global_flags.midi_mapping_filename.c_str());
 307                         ::abort();
 308                 }
 309                 midi_mapper.set_midi_mapping(midi_mapping);
 310         }
 311         midi_mapper.refresh_highlights();
 312         midi_mapper.refresh_lights();
 313         if (global_flags.fullscreen) {
 314                 QMainWindow::showFullScreen();
 315         }
 316 }
 317
 318 void MainWindow::prev_page()
 319 {
 320         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 321                 ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 2) % 3);
 322         } else {
 323                 ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 324         }
 325 }
 326
 327 void MainWindow::next_page()
 328 {
 329         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 330                 ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 1) % 3);
 331         } else {
 332                 ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 333         }
 334 }
 335
 336 void MainWindow::resizeEvent(QResizeEvent* event)
 337 {
 338         QMainWindow::resizeEvent(event);
 339
 340         // Ask for a relayout, but only after the event loop is done doing relayout
 341         // on everything else.
 342         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 343 }
 344
 345 void MainWindow::mixer_created(Mixer *mixer)
 346 {
 347         // Make the previews.
 348         unsigned num_previews = mixer->get_num_channels();
 349
 350         const char qwerty[] = "QWERTYUIOP";
 351         for (unsigned i = 0; i < num_previews; ++i) {
 352                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 353
 354                 QWidget *preview = new QWidget(this);  // Will be connected to a layout immediately after the loop.
 355                 Ui::Display *ui_display = new Ui::Display;
 356                 ui_display->setupUi(preview);
 357                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 358                 ui_display->display->set_output(output);
 359                 previews.push_back(ui_display);
 360
 361                 // Hook up the click.
 362                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 363
 364                 // Let the theme update the text whenever the resolution or color changed.
 365                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 366                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 367
 368                 // Hook up the keyboard key.
 369                 QShortcut *shortcut = nullptr;
 370                 if (i < 9) {
 371                         shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 372                 } else if (i == 9) {
 373                         shortcut = new QShortcut(QKeySequence(Qt::Key_0), this);
 374                 }
 375                 if (shortcut != nullptr) {
 376                         connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 377                 }
 378
 379                 // Hook up the quick-cut key.
 380                 if (i < strlen(qwerty)) {
 381                         QShortcut *shortcut = new QShortcut(QKeySequence(qwerty[i]), this);
 382                         connect(shortcut, &QShortcut::activated, bind(&MainWindow::quick_cut_activated, this, i));
 383                 }
 384
 385                 // Hook up the white balance button (irrelevant if invisible).
 386                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 387                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 388         }
 389
 390         // Connect the previews to the correct layout.
 391         audio_view_changed(ui->audio_views->currentIndex());
 392
 393         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 394
 395         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 396         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 397         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 398         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 399         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 400
 401         reset_audio_mapping_ui();
 402
 403         // TODO: Fetch all of the values these for completeness,
 404         // not just the enable knobs implied by flags.
 405         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 406         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 407
 408         // Controls used only for simple audio fetch their state from the first bus.
 409         constexpr unsigned simple_bus_index = 0;
 410         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 411                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 412                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 413                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 414                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 415                 ui->compressor_threshold_db_display->setText(
 416                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 417         }
 418         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 419                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 420                 midi_mapper.refresh_lights();
 421         });
 422         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 423                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 424         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 425                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 426                 midi_mapper.refresh_lights();
 427         });
 428         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 429                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 430         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 431                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 432                 midi_mapper.refresh_lights();
 433         });
 434
 435         // Global mastering controls.
 436         QString limiter_threshold_label(
 437                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 438         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 439         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 440
 441         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 442         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 443
 444         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 445         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 446                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 447                 midi_mapper.refresh_lights();
 448         });
 449
 450         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 451         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 452                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 453                 midi_mapper.refresh_lights();
 454         });
 455         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 456         // Even though we have a reset button right next to it, the fact that
 457         // the expanded audio view labels are clickable makes it natural to
 458         // click this one as well.
 459         connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
 460         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 461
 462         midi_mapper.refresh_highlights();
 463         midi_mapper.refresh_lights();
 464         midi_mapper.start_thread();
 465
 466         analyzer.reset(new Analyzer);
 467
 468         global_mixer->set_theme_menu_callback(bind(&MainWindow::setup_theme_menu, this));
 469         setup_theme_menu();
 470
 471         struct sigaction act;
 472         memset(&act, 0, sizeof(act));
 473         act.sa_handler = schedule_cut_signal;
 474         act.sa_flags = SA_RESTART;
 475         sigaction(SIGHUP, &act, nullptr);
 476
 477         // Mostly for debugging. Don't override SIGINT, that's so evil if
 478         // shutdown isn't instant.
 479         memset(&act, 0, sizeof(act));
 480         act.sa_handler = quit_signal;
 481         act.sa_flags = SA_RESTART;
 482         sigaction(SIGUSR1, &act, nullptr);
 483 }
 484
 485 void MainWindow::reset_audio_mapping_ui()
 486 {
 487         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 488
 489         ui->simple_audio_mode->setChecked(simple);
 490         ui->multichannel_audio_mode->setChecked(!simple);
 491         ui->input_mapping_action->setEnabled(!simple);
 492         ui->midi_mapping_action->setEnabled(!simple);
 493
 494         ui->locut_enabled->setVisible(simple);
 495         ui->gainstaging_label->setVisible(simple);
 496         ui->gainstaging_knob->setVisible(simple);
 497         ui->gainstaging_db_display->setVisible(simple);
 498         ui->gainstaging_auto_checkbox->setVisible(simple);
 499         ui->compressor_threshold_label->setVisible(simple);
 500         ui->compressor_threshold_knob->setVisible(simple);
 501         ui->compressor_threshold_db_display->setVisible(simple);
 502         ui->compressor_enabled->setVisible(simple);
 503
 504         setup_audio_miniview();
 505         setup_audio_expanded_view();
 506
 507         if (simple) {
 508                 ui->compact_label->setText("Compact audio view (1/2)  ");
 509                 ui->video_grid_label->setText("Video grid display (2/2)  ");
 510                 if (ui->audio_views->currentIndex() == 1) {
 511                         // Full audio view is not available in simple mode.
 512                         ui->audio_views->setCurrentIndex(0);
 513                 }
 514         } else {
 515                 ui->compact_label->setText("Compact audio view (1/3)  ");
 516                 ui->full_label->setText("Full audio view (2/3)  ");
 517                 ui->video_grid_label->setText("Video grid display (3/3)  ");
 518         }
 519
 520         midi_mapper.refresh_highlights();
 521         midi_mapper.refresh_lights();
 522 }
 523
 524 void MainWindow::setup_audio_miniview()
 525 {
 526         // Remove any existing channels.
 527         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 528                 delete item->widget();
 529                 delete item;
 530         }
 531         audio_miniviews.clear();
 532
 533         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 534                 return;
 535         }
 536
 537         // Set up brand new ones from the input mapping.
 538         InputMapping mapping = global_audio_mixer->get_input_mapping();
 539         audio_miniviews.resize(mapping.buses.size());
 540         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 541                 QWidget *channel = new QWidget(this);
 542                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 543                 ui_audio_miniview->setupUi(channel);
 544                 ui_audio_miniview->bus_desc_label->setFullText(
 545                         QString::fromStdString(get_bus_desc_label(mapping.buses[bus_index])));
 546                 audio_miniviews[bus_index] = ui_audio_miniview;
 547
 548                 // Set up the peak meter.
 549                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 550                 peak_meter->set_min_level(-30.0f);
 551                 peak_meter->set_max_level(0.0f);
 552                 peak_meter->set_ref_level(0.0f);
 553
 554                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 555
 556                 ui->faders->addWidget(channel);
 557
 558                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 559                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 560                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 561                         [bus_index]() {
 562                                 global_audio_mixer->reset_peak(bus_index);
 563                         });
 564         }
 565 }
 566
 567 void MainWindow::setup_audio_expanded_view()
 568 {
 569         // Remove any existing channels.
 570         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 571                 delete item->widget();
 572                 delete item;
 573         }
 574         audio_expanded_views.clear();
 575
 576         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 577                 return;
 578         }
 579
 580         // Set up brand new ones from the input mapping.
 581         InputMapping mapping = global_audio_mixer->get_input_mapping();
 582         audio_expanded_views.resize(mapping.buses.size());
 583         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 584                 QWidget *channel = new QWidget(this);
 585                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 586                 ui_audio_expanded_view->setupUi(channel);
 587                 ui_audio_expanded_view->bus_desc_label->setFullText(
 588                         QString::fromStdString(get_bus_desc_label(mapping.buses[bus_index])));
 589                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 590                 update_stereo_knob_and_label(bus_index, lrintf(100.0f * global_audio_mixer->get_stereo_width(bus_index)));
 591                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 592                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 593                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 594                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 595                 ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index));
 596                 connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
 597                         bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
 598                 ui->buses->addWidget(channel);
 599
 600                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 601                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 602                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 603                         midi_mapper.refresh_lights();
 604                 });
 605
 606                 connect(ui_audio_expanded_view->stereo_width_knob, &QDial::valueChanged,
 607                         bind(&MainWindow::stereo_width_knob_changed, this, bus_index, _1));
 608
 609                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 610                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 611                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 612                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 613                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 614                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 615
 616                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 617                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 618                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 619
 620                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 621                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 622                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 623                         midi_mapper.refresh_lights();
 624                 });
 625
 626                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 627                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 628                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 629                         midi_mapper.refresh_lights();
 630                 });
 631
 632                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 633
 634                 // Set up the peak meter.
 635                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 636                 peak_meter->set_min_level(-30.0f);
 637                 peak_meter->set_max_level(0.0f);
 638                 peak_meter->set_ref_level(0.0f);
 639
 640                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 641                         [this, bus_index]() {
 642                                 global_audio_mixer->reset_peak(bus_index);
 643                                 midi_mapper.refresh_lights();
 644                         });
 645         }
 646
 647         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 648 }
 649
 650 void MainWindow::mixer_shutting_down()
 651 {
 652         ui->me_live->shutdown();
 653         ui->me_preview->shutdown();
 654
 655         for (Ui::Display *display : previews) {
 656                 display->display->shutdown();
 657         }
 658
 659         analyzer->mixer_shutting_down();
 660 }
 661
 662 void MainWindow::cut_triggered()
 663 {
 664         global_mixer->schedule_cut();
 665 }
 666
 667 void MainWindow::x264_bitrate_triggered()
 668 {
 669         bool ok;
 670         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);
 671         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 672                 global_flags.x264_bitrate = new_bitrate;
 673                 global_mixer->change_x264_bitrate(new_bitrate);
 674         }
 675 }
 676
 677 void MainWindow::exit_triggered()
 678 {
 679         close();
 680 }
 681
 682 void MainWindow::manual_triggered()
 683 {
 684         if (!QDesktopServices::openUrl(QUrl("https://nageru.sesse.net/doc/"))) {
 685                 QMessageBox msgbox;
 686                 msgbox.setText("Could not launch manual in web browser.\nPlease see https://nageru.sesse.net/doc/ manually.");
 687                 msgbox.exec();
 688         }
 689 }
 690
 691 void MainWindow::about_triggered()
 692 {
 693         AboutDialog("Nageru", "Realtime video mixer").exec();
 694 }
 695
 696 void MainWindow::open_analyzer_triggered()
 697 {
 698         analyzer->show();
 699 }
 700
 701 void MainWindow::simple_audio_mode_triggered()
 702 {
 703         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 704                 return;
 705         }
 706         unsigned card_index = global_audio_mixer->get_simple_input();
 707         if (card_index == numeric_limits<unsigned>::max()) {
 708                 QMessageBox::StandardButton reply =
 709                         QMessageBox::question(this,
 710                                 "Mapping too complex",
 711                                 "The current audio mapping is too complicated to be representable in simple mode, "
 712                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 713                                 QMessageBox::Yes | QMessageBox::No);
 714                 if (reply == QMessageBox::No) {
 715                         ui->simple_audio_mode->setChecked(false);
 716                         ui->multichannel_audio_mode->setChecked(true);
 717                         return;
 718                 }
 719                 card_index = 0;
 720         }
 721         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 722         reset_audio_mapping_ui();
 723 }
 724
 725 void MainWindow::multichannel_audio_mode_triggered()
 726 {
 727         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 728                 return;
 729         }
 730
 731         // Take the generated input mapping from the simple input,
 732         // and set it as a normal multichannel mapping, which causes
 733         // the mode to go to multichannel.
 734         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 735         reset_audio_mapping_ui();
 736 }
 737
 738 void MainWindow::input_mapping_triggered()
 739 {
 740         if (InputMappingDialog().exec() == QDialog::Accepted) {
 741                 setup_audio_miniview();
 742                 setup_audio_expanded_view();
 743         }
 744         midi_mapper.refresh_highlights();
 745         midi_mapper.refresh_lights();
 746 }
 747
 748 void MainWindow::midi_mapping_triggered()
 749 {
 750         MIDIMappingDialog(&midi_mapper).exec();
 751 }
 752
 753 void MainWindow::timecode_stream_triggered()
 754 {
 755         global_mixer->set_display_timecode_in_stream(ui->timecode_stream_action->isChecked());
 756 }
 757
 758 void MainWindow::timecode_stdout_triggered()
 759 {
 760         global_mixer->set_display_timecode_on_stdout(ui->timecode_stdout_action->isChecked());
 761 }
 762
 763 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 764 {
 765         if (bus_index == 0) {
 766                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 767         }
 768         if (bus_index < audio_expanded_views.size()) {
 769                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 770         }
 771
 772         float gain_db = value * 0.1f;
 773         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 774
 775         // The label will be updated by the audio level callback.
 776 }
 777
 778 void MainWindow::final_makeup_gain_knob_changed(int value)
 779 {
 780         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 781
 782         float gain_db = value * 0.1f;
 783         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 784
 785         // The label will be updated by the audio level callback.
 786 }
 787
 788 void MainWindow::cutoff_knob_changed(int value)
 789 {
 790         float octaves = value * 0.1f;
 791         float cutoff_hz = 20.0 * pow(2.0, octaves);
 792         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 793         update_cutoff_labels(cutoff_hz);
 794 }
 795
 796 void MainWindow::update_cutoff_labels(float cutoff_hz)
 797 {
 798         char buf[256];
 799         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 800         ui->locut_cutoff_display->setText(buf);
 801         ui->locut_cutoff_display_2->setText(buf);
 802
 803         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 804                 audio_expanded_views[bus_index]->locut_enabled->setText(
 805                         QString("Lo-cut: ") + buf);
 806         }
 807 }
 808
 809 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left, double file_length_seconds)
 810 {
 811         char time_str[256];
 812         if (estimated_seconds_left < 60.0) {
 813                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 814         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 815                 int s = lrintf(estimated_seconds_left);
 816                 int m = s / 60;
 817                 s %= 60;
 818                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 819         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 820                 int m = lrintf(estimated_seconds_left / 60.0);
 821                 snprintf(time_str, sizeof(time_str), "%dm", m);
 822         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 823                 int m = lrintf(estimated_seconds_left / 60.0);
 824                 int h = m / 60;
 825                 m %= 60;
 826                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 827         } else {  // More than ten hours: Xh.
 828                 int h = lrintf(estimated_seconds_left / 3600.0);
 829                 snprintf(time_str, sizeof(time_str), "%dh", h);
 830         }
 831         char buf[256];
 832         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 833
 834         // NOTE: The default formatter does not use file_length_seconds for anything,
 835         // but the theme might want to do so.
 836         std::string label = global_mixer->format_status_line(buf, file_length_seconds);
 837
 838         post_to_main_thread([this, label]{
 839                 disk_free_label->setText(QString::fromStdString(label));
 840                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 841         });
 842 }
 843
 844 void MainWindow::stereo_width_knob_changed(unsigned bus_index, int value)
 845 {
 846         float stereo_width = value * 0.01f;
 847         global_audio_mixer->set_stereo_width(bus_index, stereo_width);
 848
 849         update_stereo_label(bus_index, value);
 850 }
 851
 852 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 853 {
 854         float gain_db = value * 0.1f;
 855         global_audio_mixer->set_eq(bus_index, band, gain_db);
 856
 857         update_eq_label(bus_index, band, gain_db);
 858 }
 859
 860 void MainWindow::update_stereo_knob_and_label(unsigned bus_index, int stereo_width_percent)
 861 {
 862         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 863
 864         if (global_audio_mixer->is_mono(bus_index)) {
 865                 view->stereo_width_knob->setEnabled(false);
 866                 view->stereo_width_label->setEnabled(false);
 867         } else {
 868                 view->stereo_width_knob->setEnabled(true);
 869                 view->stereo_width_label->setEnabled(true);
 870         }
 871         view->stereo_width_knob->setValue(stereo_width_percent);
 872         update_stereo_label(bus_index, stereo_width_percent);
 873 }
 874
 875 void MainWindow::update_stereo_label(unsigned bus_index, int stereo_width_percent)
 876 {
 877         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 878
 879         if (global_audio_mixer->is_mono(bus_index)) {
 880                 view->stereo_width_label->setText("Mono");
 881         } else {
 882                 char buf[256];
 883                 snprintf(buf, sizeof(buf), "Stereo: %d%%", stereo_width_percent);
 884                 view->stereo_width_label->setText(buf);
 885         }
 886 }
 887
 888 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 889 {
 890         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 891         string db_string = format_db(gain_db, DB_WITH_SIGN);
 892         switch (band) {
 893         case EQ_BAND_TREBLE:
 894                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 895                 break;
 896         case EQ_BAND_MID:
 897                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 898                 break;
 899         case EQ_BAND_BASS:
 900                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 901                 break;
 902         default:
 903                 assert(false);
 904         }
 905 }
 906
 907 void MainWindow::setup_theme_menu()
 908 {
 909         Theme::MenuEntry *root_menu = global_mixer->get_theme_menu();
 910
 911         // Remove the old menu, if any.
 912         if (theme_menu != nullptr) {
 913                 ui->menuBar->removeAction(theme_menu->menuAction());
 914                 theme_menu = nullptr;
 915         }
 916
 917         if (root_menu != nullptr) {
 918                 assert(root_menu->is_submenu);
 919                 if (!root_menu->submenu.empty()) {
 920                         theme_menu = new QMenu("&Theme");
 921                         fill_menu_from_theme_menu(root_menu->submenu, theme_menu);
 922                         ui->menuBar->insertMenu(ui->menu_Help->menuAction(), theme_menu);
 923                 }
 924         }
 925 }
 926
 927 void MainWindow::fill_menu_from_theme_menu(const vector<unique_ptr<Theme::MenuEntry>> &entries, QMenu *menu)
 928 {
 929         for (const unique_ptr<Theme::MenuEntry> &entry : entries) {
 930                 if (entry->is_submenu) {
 931                         QMenu *submenu = new QMenu(QString::fromStdString(entry->text));
 932                         fill_menu_from_theme_menu(entry->submenu, submenu);
 933                         menu->addMenu(submenu);
 934                         continue;
 935                 }
 936
 937                 QAction *action = menu->addAction(QString::fromStdString(entry->text));
 938                 if (entry->entry.flags == Theme::MenuEntry::CHECKABLE) {
 939                         action->setCheckable(true);
 940                 } else if (entry->entry.flags == Theme::MenuEntry::CHECKED) {
 941                         action->setCheckable(true);
 942                         action->setChecked(true);
 943                 }
 944                 connect(action, &QAction::triggered, [lua_ref = entry->entry.lua_ref] {
 945                         global_mixer->theme_menu_entry_clicked(lua_ref);
 946                 });
 947         }
 948 }
 949
 950 void MainWindow::limiter_threshold_knob_changed(int value)
 951 {
 952         float threshold_dbfs = value * 0.1f;
 953         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 954         ui->limiter_threshold_db_display->setText(
 955                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 956         ui->limiter_threshold_db_display_2->setText(
 957                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 958 }
 959
 960 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 961 {
 962         float threshold_dbfs = value * 0.1f;
 963         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 964
 965         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 966         if (bus_index == 0) {
 967                 ui->compressor_threshold_db_display->setText(label);
 968         }
 969         if (bus_index < audio_expanded_views.size()) {
 970                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 971         }
 972 }
 973
 974 void MainWindow::mini_fader_changed(int bus, double volume_db)
 975 {
 976         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 977         audio_miniviews[bus]->fader_label->setText(label);
 978         audio_expanded_views[bus]->fader_label->setText(label);
 979
 980         global_audio_mixer->set_fader_volume(bus, volume_db);
 981 }
 982
 983 void MainWindow::mute_button_toggled(int bus, bool checked)
 984 {
 985         global_audio_mixer->set_mute(bus, checked);
 986         midi_mapper.refresh_lights();
 987 }
 988
 989 void MainWindow::reset_meters_button_clicked()
 990 {
 991         global_audio_mixer->reset_meters();
 992         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 993         ui->peak_display->setStyleSheet("");
 994 }
 995
 996 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 997                                       float global_level_lufs,
 998                                       float range_low_lufs, float range_high_lufs,
 999                                       float final_makeup_gain_db,
1000                                       float correlation)
1001 {
1002         steady_clock::time_point now = steady_clock::now();
1003
1004         // The meters are somewhat inefficient to update. Only update them
1005         // every 100 ms or so (we get updates every 5–20 ms). Note that this
1006         // means that the digital peak meters are ever so slightly too low
1007         // (each update won't be a faithful representation of the highest peak
1008         // since the previous update, since there are frames we won't draw),
1009         // but the _peak_ of the peak meters will be correct (it's tracked in
1010         // AudioMixer, not here), and that's much more important.
1011         double last_update_age = duration<double>(now - last_audio_level_callback).count();
1012         if (last_update_age < 0.100) {
1013                 return;
1014         }
1015         last_audio_level_callback = now;
1016
1017         post_to_main_thread([=]() {
1018                 ui->vu_meter->set_level(level_lufs);
1019                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
1020                         if (bus_index < audio_miniviews.size()) {
1021                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
1022                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
1023                                 miniview->peak_meter->set_level(
1024                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
1025                                 miniview->peak_meter->set_peak(
1026                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
1027                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
1028
1029                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
1030                                 view->peak_meter->set_level(
1031                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
1032                                 view->peak_meter->set_peak(
1033                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
1034                                 view->reduction_meter->set_reduction_db(level.compressor_attenuation_db);
1035                                 view->gainstaging_knob->blockSignals(true);
1036                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
1037                                 view->gainstaging_knob->blockSignals(false);
1038                                 view->gainstaging_db_display->setText(
1039                                         QString("Gain: ") +
1040                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
1041                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
1042
1043                                 midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
1044                         }
1045                 }
1046                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
1047                 ui->correlation_meter->set_correlation(correlation);
1048
1049                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
1050                 set_peak_label(ui->peak_display, peak_db);
1051
1052                 // NOTE: Will be invisible when using multitrack audio.
1053                 if (!bus_levels.empty()) {
1054                         ui->gainstaging_knob->blockSignals(true);
1055                         ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
1056                         ui->gainstaging_knob->blockSignals(false);
1057                         ui->gainstaging_db_display->setText(
1058                                 QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
1059                 }
1060
1061                 ui->makeup_gain_knob->blockSignals(true);
1062                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
1063                 ui->makeup_gain_knob->blockSignals(false);
1064                 ui->makeup_gain_db_display->setText(
1065                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
1066                 ui->makeup_gain_db_display_2->setText(
1067                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
1068
1069                 // Peak labels could have changed.
1070                 midi_mapper.refresh_lights();
1071         });
1072 }
1073
1074 void MainWindow::relayout()
1075 {
1076         int height = ui->vertical_layout->geometry().height();
1077         if (height <= 0) {
1078                 // Seemingly this can happen and must be ignored.
1079                 return;
1080         }
1081
1082         double remaining_height = height;
1083
1084         // Allocate the height; the most important part is to keep the main displays
1085         // at the right aspect if at all possible.
1086         double me_width = ui->me_preview->width();
1087         double me_height = me_width * double(global_flags.height) / double(global_flags.width) + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
1088
1089         // TODO: Scale the widths when we need to do this.
1090         if (me_height / double(height) > 0.8) {
1091                 me_height = height * 0.8;
1092         }
1093         remaining_height -= me_height + ui->vertical_layout->spacing();
1094
1095         // Space between the M/E displays and the audio strip.
1096         remaining_height -= ui->vertical_layout->spacing();
1097
1098         // The label above the audio strip.
1099         double compact_label_height = ui->compact_label->minimumHeight() +
1100                 ui->compact_audio_layout->spacing();
1101         remaining_height -= compact_label_height;
1102
1103         // The previews will be constrained by the remaining height, and the width.
1104         double preview_label_height = previews[0]->label->minimumSize().height() +
1105                 previews[0]->main_vertical_layout->spacing();
1106         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
1107         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * double(global_flags.height) / double(global_flags.width));
1108         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
1109
1110         ui->vertical_layout->setStretch(0, lrintf(me_height));
1111         ui->vertical_layout->setStretch(1,
1112                 lrintf(compact_label_height) +
1113                 lrintf(remaining_height) +
1114                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
1115
1116         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
1117         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
1118         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
1119
1120         if (current_audio_view == 0) {  // Compact audio view.
1121                 // Set the widths for the previews.
1122                 double preview_width = preview_height * double(global_flags.width) / double(global_flags.height);
1123                 for (unsigned i = 0; i < previews.size(); ++i) {
1124                         ui->preview_displays->setStretch(i, lrintf(preview_width));
1125                 }
1126
1127                 // The preview horizontal spacer.
1128                 double remaining_preview_width = preview_total_width - previews.size() * preview_width;
1129                 ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
1130         } else if (current_audio_view == 2) {  // Video grid view.
1131                 // QGridLayout doesn't do it for us, since we need to be able to remove rows
1132                 // or columns as the grid changes, and it won't do that. Thus, position everything
1133                 // by hand.
1134                 constexpr int spacing = 6;
1135                 int grid_width = ui->preview_displays_grid->geometry().width();
1136                 int grid_height = ui->preview_displays_grid->geometry().height();
1137                 int best_preview_width = 0;
1138                 unsigned best_num_rows = 1, best_num_cols = 1;
1139                 for (unsigned num_rows = 1; num_rows <= previews.size(); ++num_rows) {
1140                         int num_cols = (previews.size() + num_rows - 1) / num_rows;
1141
1142                         int max_preview_height = (grid_height - spacing * (num_rows - 1)) / num_rows - preview_label_height;
1143                         int max_preview_width = (grid_width - spacing * (num_cols - 1)) / num_cols;
1144                         int preview_width = std::min<int>(max_preview_width, max_preview_height * double(global_flags.width) / double(global_flags.height));
1145
1146                         if (preview_width > best_preview_width) {
1147                                 best_preview_width = preview_width;
1148                                 best_num_rows = num_rows;
1149                                 best_num_cols = num_cols;
1150                         }
1151                 }
1152
1153                 double cell_height = lrintf(best_preview_width * double(global_flags.height) / double(global_flags.width)) + preview_label_height;
1154                 remaining_height = grid_height - best_num_rows * cell_height - (best_num_rows - 1) * spacing;
1155                 int cell_width = best_preview_width;
1156                 int remaining_width = grid_width - best_num_cols * cell_width - (best_num_cols - 1) * spacing;
1157
1158                 for (unsigned i = 0; i < previews.size(); ++i) {
1159                         int col_idx = i % best_num_cols;
1160                         int row_idx = i / best_num_cols;
1161
1162                         double top = remaining_height * 0.5f + row_idx * (cell_height + spacing);
1163                         double bottom = top + cell_height;
1164                         double left = remaining_width * 0.5f + col_idx * (cell_width + spacing);
1165                         double right = left + cell_width;
1166
1167                         QRect rect;
1168                         rect.setTop(lrintf(top));
1169                         rect.setBottom(lrintf(bottom));
1170                         rect.setLeft(lrintf(left));
1171                         rect.setRight(lrintf(right));
1172
1173                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1174                         display->setGeometry(rect);
1175                         display->show();
1176                 }
1177         }
1178 }
1179
1180 void MainWindow::set_locut(float value)
1181 {
1182         set_relative_value(ui->locut_cutoff_knob, value);
1183 }
1184
1185 void MainWindow::set_limiter_threshold(float value)
1186 {
1187         set_relative_value(ui->limiter_threshold_knob, value);
1188 }
1189
1190 void MainWindow::set_makeup_gain(float value)
1191 {
1192         set_relative_value(ui->makeup_gain_knob, value);
1193 }
1194
1195 void MainWindow::set_stereo_width(unsigned bus_idx, float value)
1196 {
1197         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::stereo_width_knob, value);
1198 }
1199
1200 void MainWindow::set_treble(unsigned bus_idx, float value)
1201 {
1202         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
1203 }
1204
1205 void MainWindow::set_eq_absolute(unsigned bus_idx, EQBand eq_band, float value_db)
1206 {
1207         if (eq_band == EQ_BAND_TREBLE) {
1208                 set_db_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value_db);
1209         } else if (eq_band == EQ_BAND_MID) {
1210                 set_db_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value_db);
1211         } else if (eq_band == EQ_BAND_BASS) {
1212                 set_db_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value_db);
1213         } else {
1214                 assert(false);
1215         }
1216 }
1217
1218 void MainWindow::set_mid(unsigned bus_idx, float value)
1219 {
1220         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
1221 }
1222
1223 void MainWindow::set_bass(unsigned bus_idx, float value)
1224 {
1225         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
1226 }
1227
1228 void MainWindow::set_gain(unsigned bus_idx, float value)
1229 {
1230         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
1231 }
1232
1233 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
1234 {
1235         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
1236 }
1237
1238 void MainWindow::set_fader(unsigned bus_idx, float value)
1239 {
1240         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
1241 }
1242
1243 void MainWindow::set_fader_absolute(unsigned bus_idx, float value_db)
1244 {
1245         if (global_audio_mixer != nullptr &&
1246             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1247             bus_idx < audio_expanded_views.size()) {
1248                 audio_expanded_views[bus_idx]->fader->setDbValue(value_db);
1249         }
1250 }
1251
1252 void MainWindow::toggle_mute(unsigned bus_idx)
1253 {
1254         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
1255 }
1256
1257 void MainWindow::toggle_locut(unsigned bus_idx)
1258 {
1259         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
1260 }
1261
1262 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
1263 {
1264         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
1265 }
1266
1267 void MainWindow::toggle_compressor(unsigned bus_idx)
1268 {
1269         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
1270 }
1271
1272 void MainWindow::clear_peak(unsigned bus_idx)
1273 {
1274         post_to_main_thread([=]{
1275                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1276                         global_audio_mixer->reset_peak(bus_idx);
1277                         midi_mapper.set_has_peaked(bus_idx, false);
1278                         midi_mapper.refresh_lights();
1279                 }
1280         });
1281 }
1282
1283 void MainWindow::clear_all_highlights()
1284 {
1285         post_to_main_thread([this]{
1286                 highlight_locut(false);
1287                 highlight_limiter_threshold(false);
1288                 highlight_makeup_gain(false);
1289                 highlight_toggle_limiter(false);
1290                 highlight_toggle_auto_makeup_gain(false);
1291                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
1292                         highlight_treble(bus_idx, false);
1293                         highlight_mid(bus_idx, false);
1294                         highlight_bass(bus_idx, false);
1295                         highlight_gain(bus_idx, false);
1296                         highlight_compressor_threshold(bus_idx, false);
1297                         highlight_fader(bus_idx, false);
1298                         highlight_mute(bus_idx, false);
1299                         highlight_toggle_locut(bus_idx, false);
1300                         highlight_toggle_auto_gain_staging(bus_idx, false);
1301                         highlight_toggle_compressor(bus_idx, false);
1302                 }
1303         });
1304 }
1305
1306 void MainWindow::toggle_limiter()
1307 {
1308         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1309                 ui->limiter_enabled->click();
1310         }
1311 }
1312
1313 void MainWindow::toggle_auto_makeup_gain()
1314 {
1315         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1316                 ui->makeup_gain_auto_checkbox->click();
1317         }
1318 }
1319
1320 void MainWindow::switch_video_channel(int channel_number)
1321 {
1322         global_mixer->channel_clicked(channel_number);
1323 }
1324
1325 void MainWindow::apply_transition(int transition_number)
1326 {
1327         global_mixer->transition_clicked(transition_number);
1328 }
1329
1330 void MainWindow::prev_audio_view()
1331 {
1332         post_to_main_thread([this]{
1333                 prev_page();
1334         });
1335 }
1336
1337 void MainWindow::next_audio_view()
1338 {
1339         post_to_main_thread([this]{
1340                 next_page();
1341         });
1342 }
1343
1344 void MainWindow::begin_new_segment()
1345 {
1346         global_mixer->schedule_cut();
1347 }
1348
1349 void MainWindow::exit()
1350 {
1351         post_to_main_thread([this]{
1352                 close();
1353         });
1354 }
1355
1356 void MainWindow::highlight_locut(bool highlight)
1357 {
1358         post_to_main_thread([this, highlight]{
1359                 highlight_control(ui->locut_cutoff_knob, highlight);
1360                 highlight_control(ui->locut_cutoff_knob_2, highlight);
1361         });
1362 }
1363
1364 void MainWindow::highlight_limiter_threshold(bool highlight)
1365 {
1366         post_to_main_thread([this, highlight]{
1367                 highlight_control(ui->limiter_threshold_knob, highlight);
1368                 highlight_control(ui->limiter_threshold_knob_2, highlight);
1369         });
1370 }
1371
1372 void MainWindow::highlight_makeup_gain(bool highlight)
1373 {
1374         post_to_main_thread([this, highlight]{
1375                 highlight_control(ui->makeup_gain_knob, highlight);
1376                 highlight_control(ui->makeup_gain_knob_2, highlight);
1377         });
1378 }
1379
1380 void MainWindow::highlight_stereo_width(unsigned bus_idx, bool highlight)
1381 {
1382         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::stereo_width_knob, highlight);
1383 }
1384
1385 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
1386 {
1387         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
1388 }
1389
1390 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
1391 {
1392         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
1393 }
1394
1395 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
1396 {
1397         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
1398 }
1399
1400 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
1401 {
1402         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
1403 }
1404
1405 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
1406 {
1407         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
1408 }
1409
1410 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1411 {
1412         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1413 }
1414
1415 void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
1416 {
1417         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
1418 }
1419
1420 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1421 {
1422         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1423 }
1424
1425 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1426 {
1427         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1428 }
1429
1430 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1431 {
1432         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1433 }
1434
1435 void MainWindow::highlight_toggle_limiter(bool highlight)
1436 {
1437         post_to_main_thread([this, highlight]{
1438                 highlight_control(ui->limiter_enabled, highlight);
1439                 highlight_control(ui->limiter_enabled_2, highlight);
1440         });
1441 }
1442
1443 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1444 {
1445         post_to_main_thread([this, highlight]{
1446                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1447                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1448         });
1449 }
1450
1451 template<class T>
1452 void MainWindow::set_relative_value(T *control, float value)
1453 {
1454         post_to_main_thread([control, value]{
1455                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1456         });
1457 }
1458
1459 template<class T>
1460 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1461 {
1462         if (global_audio_mixer != nullptr &&
1463             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1464             bus_idx < audio_expanded_views.size()) {
1465                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1466         }
1467 }
1468
1469 void MainWindow::set_db_value_if_exists(unsigned bus_idx, QDial *(Ui_AudioExpandedView::*control), float value_db)
1470 {
1471         post_to_main_thread([this, bus_idx, control, value_db]{
1472                 if (global_audio_mixer != nullptr &&
1473                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1474                     bus_idx < audio_expanded_views.size()) {
1475                         int value = lrintf(value_db * 10.0f);
1476                         (audio_expanded_views[bus_idx]->*control)->setValue(value);
1477                 }
1478         });
1479 }
1480
1481 template<class T>
1482 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1483 {
1484         post_to_main_thread([this, bus_idx, control]{
1485                 if (global_audio_mixer != nullptr &&
1486                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1487                     bus_idx < audio_expanded_views.size()) {
1488                         (audio_expanded_views[bus_idx]->*control)->click();
1489                 }
1490         });
1491 }
1492
1493 template<class T>
1494 void MainWindow::highlight_control(T *control, bool highlight)
1495 {
1496         if (control == nullptr) {
1497                 return;
1498         }
1499         if (global_audio_mixer == nullptr ||
1500             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1501                 highlight = false;
1502         }
1503         if (highlight) {
1504                 control->setStyleSheet("background: rgb(0,255,0,80)");
1505         } else {
1506                 control->setStyleSheet("");
1507         }
1508 }
1509
1510 template<class T>
1511 void MainWindow::highlight_mute_control(T *control, bool highlight)
1512 {
1513         if (control == nullptr) {
1514                 return;
1515         }
1516         if (global_audio_mixer == nullptr ||
1517             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1518                 highlight = false;
1519         }
1520         if (highlight) {
1521                 control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
1522         } else {
1523                 control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
1524         }
1525 }
1526
1527 template<class T>
1528 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
1529 {
1530         post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
1531                 if (bus_idx < audio_expanded_views.size()) {
1532                         if (is_mute_button) {
1533                                 highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
1534                         } else {
1535                                 highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1536                         }
1537                 }
1538         });
1539 }
1540
1541 void MainWindow::set_transition_names(vector<string> transition_names)
1542 {
1543         if (transition_names.size() < 1 || transition_names[0].empty()) {
1544                 transition_btn1->setText(QString(""));
1545         } else {
1546                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1547                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1548         }
1549         if (transition_names.size() < 2 || transition_names[1].empty()) {
1550                 transition_btn2->setText(QString(""));
1551         } else {
1552                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1553                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1554         }
1555         if (transition_names.size() < 3 || transition_names[2].empty()) {
1556                 transition_btn3->setText(QString(""));
1557         } else {
1558                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1559                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1560         }
1561 }
1562
1563 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1564 {
1565         if (output == Mixer::OUTPUT_LIVE) {
1566                 ui->label_live->setText(name.c_str());
1567         } else if (output == Mixer::OUTPUT_PREVIEW) {
1568                 ui->label_preview->setText(name.c_str());
1569         } else if (output >= Mixer::OUTPUT_INPUT0) {
1570                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1571                 previews[channel]->label->setText(name.c_str());
1572         }
1573
1574         analyzer->update_channel_name(output, name);
1575 }
1576
1577 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1578 {
1579         if (output >= Mixer::OUTPUT_INPUT0) {
1580                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1581                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1582         }
1583 }
1584
1585 void MainWindow::transition_clicked(int transition_number)
1586 {
1587         global_mixer->transition_clicked(transition_number);
1588 }
1589
1590 void MainWindow::channel_clicked(int channel_number)
1591 {
1592         if (current_wb_pick_display == channel_number) {
1593                 // The picking was already done from eventFilter(), since we don't get
1594                 // the mouse pointer here.
1595         } else {
1596                 global_mixer->channel_clicked(channel_number);
1597         }
1598 }
1599
1600 void MainWindow::quick_cut_activated(int channel_number)
1601 {
1602         if (!global_flags.enable_quick_cut_keys) {
1603                 return;
1604         }
1605         global_mixer->channel_clicked(channel_number);
1606         global_mixer->transition_clicked(0);
1607 }
1608
1609 void MainWindow::wb_button_clicked(int channel_number)
1610 {
1611         current_wb_pick_display = channel_number;
1612         QApplication::setOverrideCursor(Qt::CrossCursor);
1613 }
1614
1615 void MainWindow::audio_view_changed(int audio_view)
1616 {
1617         if (audio_view == current_audio_view) {
1618                 return;
1619         }
1620
1621         if (audio_view == 0) {
1622                 // Compact audio view. (1, full audio view, has no video previews.)
1623                 for (unsigned i = 0; i < previews.size(); ++i) {
1624                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1625                         ui->preview_displays->insertWidget(i, display, 1);
1626                 }
1627         } else if (audio_view == 2) {
1628                 // Video grid display.
1629                 for (unsigned i = 0; i < previews.size(); ++i) {
1630                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1631                         display->setParent(ui->preview_displays_grid);
1632                         display->show();
1633                 }
1634         }
1635
1636         current_audio_view = audio_view;
1637
1638         // Ask for a relayout, but only after the event loop is done doing relayout
1639         // on everything else.
1640         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
1641 }
1642
1643 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1644 {
1645         if (current_wb_pick_display != -1 &&
1646             event->type() == QEvent::MouseButtonRelease &&
1647             watched->isWidgetType()) {
1648                 QApplication::restoreOverrideCursor();
1649                 if (watched == previews[current_wb_pick_display]->display) {
1650                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1651                         previews[current_wb_pick_display]->display->grab_white_balance(
1652                                 current_wb_pick_display,
1653                                 mouse_event->x(), mouse_event->y());
1654                 } else {
1655                         // The user clicked on something else, give up.
1656                         // (The click goes through, which might not be ideal, but, yes.)
1657                         current_wb_pick_display = -1;
1658                 }
1659         }
1660         return false;
1661 }
1662
1663 void MainWindow::closeEvent(QCloseEvent *event)
1664 {
1665         if (global_mixer->get_num_connected_clients() > 0) {
1666                 QMessageBox::StandardButton reply =
1667                         QMessageBox::question(this, "Nageru", "There are clients connected. Do you really want to quit?",
1668                                 QMessageBox::Yes | QMessageBox::No);
1669                 if (reply != QMessageBox::Yes) {
1670                         event->ignore();
1671                         return;
1672                 }
1673         }
1674
1675         analyzer->hide();
1676         global_mixer->quit();
1677         mixer_shutting_down();
1678         event->accept();
1679 }
1680
1681 void MainWindow::audio_state_changed()
1682 {
1683         post_to_main_thread([this]{
1684                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
1685                         return;
1686                 }
1687                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1688                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1689                         string label = get_bus_desc_label(mapping.buses[bus_index]);
1690                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1691                                 QString::fromStdString(label));
1692                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1693                                 QString::fromStdString(label));
1694                 }
1695         });
1696 }