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