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