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_NO_FLAGS = 0x0;
 133 constexpr unsigned DB_WITH_SIGN = 0x1;
 134 constexpr unsigned DB_BARE = 0x2;
 135
 136 string format_db(double db, unsigned flags)
 137 {
 138         string text;
 139         if (flags & DB_WITH_SIGN) {
 140                 if (isfinite(db)) {
 141                         char buf[256];
 142                         snprintf(buf, sizeof(buf), "%+.1f", db);
 143                         text = buf;
 144                 } else if (db < 0.0) {
 145                         text = "-∞";
 146                 } else {
 147                         // Should never happen, really.
 148                         text = "+∞";
 149                 }
 150         } else {
 151                 if (isfinite(db)) {
 152                         char buf[256];
 153                         snprintf(buf, sizeof(buf), "%.1f", db);
 154                         text = buf;
 155                 } else if (db < 0.0) {
 156                         text = "-∞";
 157                 } else {
 158                         // Should never happen, really.
 159                         text = "∞";
 160                 }
 161         }
 162         if (!(flags & DB_BARE)) {
 163                 text += " dB";
 164         }
 165         return text;
 166 }
 167
 168 void set_peak_label(QLabel *peak_label, float peak_db)
 169 {
 170         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 171
 172         if (peak_db > peak_limit_dbfs) {
 173                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 174         } else {
 175                 peak_label->setStyleSheet("");
 176         }
 177 }
 178
 179 }  // namespace
 180
 181 MainWindow::MainWindow()
 182         : ui(new Ui::MainWindow), midi_mapper(this)
 183 {
 184         global_mainwindow = this;
 185         ui->setupUi(this);
 186
 187         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 188         disk_free_label = new QLabel(this);
 189         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 190         ui->menuBar->setCornerWidget(disk_free_label);
 191
 192         QActionGroup *audio_mapping_group = new QActionGroup(this);
 193         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 194         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 195
 196         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 197         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 198
 199         // The menus.
 200         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 201         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 202         connect(ui->manual_action, &QAction::triggered, this, &MainWindow::manual_triggered);
 203         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 204         connect(ui->open_analyzer_action, &QAction::triggered, this, &MainWindow::open_analyzer_triggered);
 205         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 206         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 207         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 208         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 209         connect(ui->timecode_stream_action, &QAction::triggered, this, &MainWindow::timecode_stream_triggered);
 210         connect(ui->timecode_stdout_action, &QAction::triggered, this, &MainWindow::timecode_stdout_triggered);
 211
 212         ui->timecode_stream_action->setChecked(global_flags.display_timecode_in_stream);
 213         ui->timecode_stdout_action->setChecked(global_flags.display_timecode_on_stdout);
 214
 215         if (global_flags.x264_video_to_http && isinf(global_flags.x264_crf)) {
 216                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 217         } else {
 218                 ui->x264_bitrate_action->setEnabled(false);
 219         }
 220
 221         connect(ui->video_menu, &QMenu::aboutToShow, [this]{
 222                 fill_hdmi_sdi_output_device_menu(ui->hdmi_sdi_output_device_menu);
 223                 fill_hdmi_sdi_output_resolution_menu(ui->hdmi_sdi_output_resolution_menu);
 224         });
 225
 226         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 227         // TODO: Make them dynamic.
 228         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 229         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 230         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 231
 232         // Aiee...
 233         transition_btn1 = ui->transition_btn1;
 234         transition_btn2 = ui->transition_btn2;
 235         transition_btn3 = ui->transition_btn3;
 236         qRegisterMetaType<string>("std::string");
 237         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 238         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 239         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 240
 241         // Hook up the prev/next buttons on the audio views.
 242         auto prev_page = [this]{
 243                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 244                         ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 2) % 3);
 245                 } else {
 246                         ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 247                 }
 248         };
 249         auto next_page = [this]{
 250                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 251                         ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 1) % 3);
 252                 } else {
 253                         ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 254                 }
 255         };
 256         connect(ui->compact_prev_page, &QAbstractButton::clicked, prev_page);
 257         connect(ui->compact_next_page, &QAbstractButton::clicked, next_page);
 258         connect(ui->full_prev_page, &QAbstractButton::clicked, prev_page);
 259         connect(ui->full_next_page, &QAbstractButton::clicked, next_page);
 260         connect(ui->video_grid_prev_page, &QAbstractButton::clicked, prev_page);
 261         connect(ui->video_grid_next_page, &QAbstractButton::clicked, next_page);
 262
 263         // And bind the same to PgUp/PgDown.
 264         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, next_page);
 265         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, 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                         exit(1);
 285                 }
 286                 midi_mapper.set_midi_mapping(midi_mapping);
 287         }
 288         midi_mapper.refresh_highlights();
 289         midi_mapper.refresh_lights();
 290 }
 291
 292 void MainWindow::resizeEvent(QResizeEvent* event)
 293 {
 294         QMainWindow::resizeEvent(event);
 295
 296         // Ask for a relayout, but only after the event loop is done doing relayout
 297         // on everything else.
 298         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 299 }
 300
 301 void MainWindow::mixer_created(Mixer *mixer)
 302 {
 303         // Make the previews.
 304         unsigned num_previews = mixer->get_num_channels();
 305
 306         const char qwerty[] = "QWERTYUIOP";
 307         for (unsigned i = 0; i < num_previews; ++i) {
 308                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 309
 310                 QWidget *preview = new QWidget(this);  // Will be connected to a layout immediately after the loop.
 311                 Ui::Display *ui_display = new Ui::Display;
 312                 ui_display->setupUi(preview);
 313                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 314                 ui_display->display->set_output(output);
 315                 previews.push_back(ui_display);
 316
 317                 // Hook up the click.
 318                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 319
 320                 // Let the theme update the text whenever the resolution or color changed.
 321                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 322                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 323
 324                 // Hook up the keyboard key.
 325                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 326                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 327
 328                 // Hook up the quick-cut key.
 329                 if (i < strlen(qwerty)) {
 330                         QShortcut *shortcut = new QShortcut(QKeySequence(qwerty[i]), this);
 331                         connect(shortcut, &QShortcut::activated, bind(&MainWindow::quick_cut_activated, this, i));
 332                 }
 333
 334                 // Hook up the white balance button (irrelevant if invisible).
 335                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 336                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 337         }
 338
 339         // Connect the previews to the correct layout.
 340         audio_view_changed(ui->audio_views->currentIndex());
 341
 342         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 343
 344         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 345         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 346         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 347         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 348         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 349
 350         reset_audio_mapping_ui();
 351
 352         // TODO: Fetch all of the values these for completeness,
 353         // not just the enable knobs implied by flags.
 354         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 355         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 356
 357         // Controls used only for simple audio fetch their state from the first bus.
 358         constexpr unsigned simple_bus_index = 0;
 359         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 360                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 361                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 362                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 363                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 364                 ui->compressor_threshold_db_display->setText(
 365                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 366         }
 367         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 368                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 369                 midi_mapper.refresh_lights();
 370         });
 371         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 372                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 373         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 374                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 375                 midi_mapper.refresh_lights();
 376         });
 377         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 378                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 379         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 380                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 381                 midi_mapper.refresh_lights();
 382         });
 383
 384         // Global mastering controls.
 385         QString limiter_threshold_label(
 386                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 387         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 388         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 389
 390         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 391         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 392
 393         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 394         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 395                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 396                 midi_mapper.refresh_lights();
 397         });
 398
 399         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 400         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 401                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 402                 midi_mapper.refresh_lights();
 403         });
 404         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 405         // Even though we have a reset button right next to it, the fact that
 406         // the expanded audio view labels are clickable makes it natural to
 407         // click this one as well.
 408         connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
 409         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 410
 411         midi_mapper.refresh_highlights();
 412         midi_mapper.refresh_lights();
 413         midi_mapper.start_thread();
 414
 415         analyzer.reset(new Analyzer);
 416
 417         struct sigaction act;
 418         memset(&act, 0, sizeof(act));
 419         act.sa_handler = schedule_cut_signal;
 420         act.sa_flags = SA_RESTART;
 421         sigaction(SIGHUP, &act, nullptr);
 422
 423         // Mostly for debugging. Don't override SIGINT, that's so evil if
 424         // shutdown isn't instant.
 425         memset(&act, 0, sizeof(act));
 426         act.sa_handler = quit_signal;
 427         act.sa_flags = SA_RESTART;
 428         sigaction(SIGUSR1, &act, nullptr);
 429 }
 430
 431 void MainWindow::reset_audio_mapping_ui()
 432 {
 433         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 434
 435         ui->simple_audio_mode->setChecked(simple);
 436         ui->multichannel_audio_mode->setChecked(!simple);
 437         ui->input_mapping_action->setEnabled(!simple);
 438         ui->midi_mapping_action->setEnabled(!simple);
 439
 440         ui->locut_enabled->setVisible(simple);
 441         ui->gainstaging_label->setVisible(simple);
 442         ui->gainstaging_knob->setVisible(simple);
 443         ui->gainstaging_db_display->setVisible(simple);
 444         ui->gainstaging_auto_checkbox->setVisible(simple);
 445         ui->compressor_threshold_label->setVisible(simple);
 446         ui->compressor_threshold_knob->setVisible(simple);
 447         ui->compressor_threshold_db_display->setVisible(simple);
 448         ui->compressor_enabled->setVisible(simple);
 449
 450         setup_audio_miniview();
 451         setup_audio_expanded_view();
 452
 453         if (simple) {
 454                 ui->compact_label->setText("Compact audio view (1/2)  ");
 455                 ui->video_grid_label->setText("Video grid display (2/2)  ");
 456                 if (ui->audio_views->currentIndex() == 1) {
 457                         // Full audio view is not available in simple mode.
 458                         ui->audio_views->setCurrentIndex(0);
 459                 }
 460         } else {
 461                 ui->compact_label->setText("Compact audio view (1/3)  ");
 462                 ui->full_label->setText("Full audio view (2/3)  ");
 463                 ui->video_grid_label->setText("Video grid display (3/3)  ");
 464         }
 465
 466         midi_mapper.refresh_highlights();
 467         midi_mapper.refresh_lights();
 468 }
 469
 470 void MainWindow::setup_audio_miniview()
 471 {
 472         // Remove any existing channels.
 473         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 474                 delete item->widget();
 475                 delete item;
 476         }
 477         audio_miniviews.clear();
 478
 479         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 480                 return;
 481         }
 482
 483         // Set up brand new ones from the input mapping.
 484         InputMapping mapping = global_audio_mixer->get_input_mapping();
 485         audio_miniviews.resize(mapping.buses.size());
 486         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 487                 QWidget *channel = new QWidget(this);
 488                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 489                 ui_audio_miniview->setupUi(channel);
 490                 ui_audio_miniview->bus_desc_label->setFullText(
 491                         QString::fromStdString(mapping.buses[bus_index].name));
 492                 audio_miniviews[bus_index] = ui_audio_miniview;
 493
 494                 // Set up the peak meter.
 495                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 496                 peak_meter->set_min_level(-30.0f);
 497                 peak_meter->set_max_level(0.0f);
 498                 peak_meter->set_ref_level(0.0f);
 499
 500                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 501
 502                 ui->faders->addWidget(channel);
 503
 504                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 505                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 506                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 507                         [bus_index]() {
 508                                 global_audio_mixer->reset_peak(bus_index);
 509                         });
 510         }
 511 }
 512
 513 void MainWindow::setup_audio_expanded_view()
 514 {
 515         // Remove any existing channels.
 516         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 517                 delete item->widget();
 518                 delete item;
 519         }
 520         audio_expanded_views.clear();
 521
 522         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 523                 return;
 524         }
 525
 526         // Set up brand new ones from the input mapping.
 527         InputMapping mapping = global_audio_mixer->get_input_mapping();
 528         audio_expanded_views.resize(mapping.buses.size());
 529         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 530                 QWidget *channel = new QWidget(this);
 531                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 532                 ui_audio_expanded_view->setupUi(channel);
 533                 ui_audio_expanded_view->bus_desc_label->setFullText(
 534                         QString::fromStdString(mapping.buses[bus_index].name));
 535                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 536                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 537                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 538                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 539                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 540                 ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index));
 541                 connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
 542                         bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
 543                 ui->buses->addWidget(channel);
 544
 545                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 546                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 547                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 548                         midi_mapper.refresh_lights();
 549                 });
 550
 551                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 552                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 553                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 554                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 555                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 556                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 557
 558                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 559                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 560                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 561
 562                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 563                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 564                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 565                         midi_mapper.refresh_lights();
 566                 });
 567
 568                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 569                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 570                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 571                         midi_mapper.refresh_lights();
 572                 });
 573
 574                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 575
 576                 // Set up the peak meter.
 577                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 578                 peak_meter->set_min_level(-30.0f);
 579                 peak_meter->set_max_level(0.0f);
 580                 peak_meter->set_ref_level(0.0f);
 581
 582                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 583                         [this, bus_index]() {
 584                                 global_audio_mixer->reset_peak(bus_index);
 585                                 midi_mapper.refresh_lights();
 586                         });
 587         }
 588
 589         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 590 }
 591
 592 void MainWindow::mixer_shutting_down()
 593 {
 594         ui->me_live->shutdown();
 595         ui->me_preview->shutdown();
 596
 597         for (Ui::Display *display : previews) {
 598                 display->display->shutdown();
 599         }
 600
 601         analyzer->mixer_shutting_down();
 602 }
 603
 604 void MainWindow::cut_triggered()
 605 {
 606         global_mixer->schedule_cut();
 607 }
 608
 609 void MainWindow::x264_bitrate_triggered()
 610 {
 611         bool ok;
 612         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);
 613         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 614                 global_flags.x264_bitrate = new_bitrate;
 615                 global_mixer->change_x264_bitrate(new_bitrate);
 616         }
 617 }
 618
 619 void MainWindow::exit_triggered()
 620 {
 621         close();
 622 }
 623
 624 void MainWindow::manual_triggered()
 625 {
 626         if (!QDesktopServices::openUrl(QUrl("https://nageru.sesse.net/doc/"))) {
 627                 QMessageBox msgbox;
 628                 msgbox.setText("Could not launch manual in web browser.\nPlease see https://nageru.sesse.net/doc/ manually.");
 629                 msgbox.exec();
 630         }
 631 }
 632
 633 void MainWindow::about_triggered()
 634 {
 635         AboutDialog().exec();
 636 }
 637
 638 void MainWindow::open_analyzer_triggered()
 639 {
 640         analyzer->show();
 641 }
 642
 643 void MainWindow::simple_audio_mode_triggered()
 644 {
 645         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 646                 return;
 647         }
 648         unsigned card_index = global_audio_mixer->get_simple_input();
 649         if (card_index == numeric_limits<unsigned>::max()) {
 650                 QMessageBox::StandardButton reply =
 651                         QMessageBox::question(this,
 652                                 "Mapping too complex",
 653                                 "The current audio mapping is too complicated to be representable in simple mode, "
 654                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 655                                 QMessageBox::Yes | QMessageBox::No);
 656                 if (reply == QMessageBox::No) {
 657                         ui->simple_audio_mode->setChecked(false);
 658                         ui->multichannel_audio_mode->setChecked(true);
 659                         return;
 660                 }
 661                 card_index = 0;
 662         }
 663         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 664         reset_audio_mapping_ui();
 665 }
 666
 667 void MainWindow::multichannel_audio_mode_triggered()
 668 {
 669         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 670                 return;
 671         }
 672
 673         // Take the generated input mapping from the simple input,
 674         // and set it as a normal multichannel mapping, which causes
 675         // the mode to go to multichannel.
 676         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 677         reset_audio_mapping_ui();
 678 }
 679
 680 void MainWindow::input_mapping_triggered()
 681 {
 682         if (InputMappingDialog().exec() == QDialog::Accepted) {
 683                 setup_audio_miniview();
 684                 setup_audio_expanded_view();
 685         }
 686         midi_mapper.refresh_highlights();
 687         midi_mapper.refresh_lights();
 688 }
 689
 690 void MainWindow::midi_mapping_triggered()
 691 {
 692         MIDIMappingDialog(&midi_mapper).exec();
 693 }
 694
 695 void MainWindow::timecode_stream_triggered()
 696 {
 697         global_mixer->set_display_timecode_in_stream(ui->timecode_stream_action->isChecked());
 698 }
 699
 700 void MainWindow::timecode_stdout_triggered()
 701 {
 702         global_mixer->set_display_timecode_on_stdout(ui->timecode_stdout_action->isChecked());
 703 }
 704
 705 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 706 {
 707         if (bus_index == 0) {
 708                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 709         }
 710         if (bus_index < audio_expanded_views.size()) {
 711                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 712         }
 713
 714         float gain_db = value * 0.1f;
 715         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 716
 717         // The label will be updated by the audio level callback.
 718 }
 719
 720 void MainWindow::final_makeup_gain_knob_changed(int value)
 721 {
 722         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 723
 724         float gain_db = value * 0.1f;
 725         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 726
 727         // The label will be updated by the audio level callback.
 728 }
 729
 730 void MainWindow::cutoff_knob_changed(int value)
 731 {
 732         float octaves = value * 0.1f;
 733         float cutoff_hz = 20.0 * pow(2.0, octaves);
 734         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 735         update_cutoff_labels(cutoff_hz);
 736 }
 737
 738 void MainWindow::update_cutoff_labels(float cutoff_hz)
 739 {
 740         char buf[256];
 741         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 742         ui->locut_cutoff_display->setText(buf);
 743         ui->locut_cutoff_display_2->setText(buf);
 744
 745         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 746                 audio_expanded_views[bus_index]->locut_enabled->setText(
 747                         QString("Lo-cut: ") + buf);
 748         }
 749 }
 750
 751 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 752 {
 753         char time_str[256];
 754         if (estimated_seconds_left < 60.0) {
 755                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 756         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 757                 int s = lrintf(estimated_seconds_left);
 758                 int m = s / 60;
 759                 s %= 60;
 760                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 761         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 762                 int m = lrintf(estimated_seconds_left / 60.0);
 763                 snprintf(time_str, sizeof(time_str), "%dm", m);
 764         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 765                 int m = lrintf(estimated_seconds_left / 60.0);
 766                 int h = m / 60;
 767                 m %= 60;
 768                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 769         } else {  // More than ten hours: Xh.
 770                 int h = lrintf(estimated_seconds_left / 3600.0);
 771                 snprintf(time_str, sizeof(time_str), "%dh", h);
 772         }
 773         char buf[256];
 774         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 775
 776         std::string label = buf;
 777
 778         post_to_main_thread([this, label]{
 779                 disk_free_label->setText(QString::fromStdString(label));
 780                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 781         });
 782 }
 783
 784 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 785 {
 786         float gain_db = value * 0.1f;
 787         global_audio_mixer->set_eq(bus_index, band, gain_db);
 788
 789         update_eq_label(bus_index, band, gain_db);
 790 }
 791
 792 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 793 {
 794         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 795         string db_string = format_db(gain_db, DB_WITH_SIGN);
 796         switch (band) {
 797         case EQ_BAND_TREBLE:
 798                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 799                 break;
 800         case EQ_BAND_MID:
 801                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 802                 break;
 803         case EQ_BAND_BASS:
 804                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 805                 break;
 806         default:
 807                 assert(false);
 808         }
 809 }
 810
 811 void MainWindow::limiter_threshold_knob_changed(int value)
 812 {
 813         float threshold_dbfs = value * 0.1f;
 814         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 815         ui->limiter_threshold_db_display->setText(
 816                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 817         ui->limiter_threshold_db_display_2->setText(
 818                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 819 }
 820
 821 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 822 {
 823         float threshold_dbfs = value * 0.1f;
 824         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 825
 826         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 827         if (bus_index == 0) {
 828                 ui->compressor_threshold_db_display->setText(label);
 829         }
 830         if (bus_index < audio_expanded_views.size()) {
 831                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 832         }
 833 }
 834
 835 void MainWindow::mini_fader_changed(int bus, double volume_db)
 836 {
 837         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 838         audio_miniviews[bus]->fader_label->setText(label);
 839         audio_expanded_views[bus]->fader_label->setText(label);
 840
 841         global_audio_mixer->set_fader_volume(bus, volume_db);
 842 }
 843
 844 void MainWindow::mute_button_toggled(int bus, bool checked)
 845 {
 846         global_audio_mixer->set_mute(bus, checked);
 847         midi_mapper.refresh_lights();
 848 }
 849
 850 void MainWindow::reset_meters_button_clicked()
 851 {
 852         global_audio_mixer->reset_meters();
 853         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 854         ui->peak_display->setStyleSheet("");
 855 }
 856
 857 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 858                                       float global_level_lufs,
 859                                       float range_low_lufs, float range_high_lufs,
 860                                       float final_makeup_gain_db,
 861                                       float correlation)
 862 {
 863         steady_clock::time_point now = steady_clock::now();
 864
 865         // The meters are somewhat inefficient to update. Only update them
 866         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 867         // means that the digital peak meters are ever so slightly too low
 868         // (each update won't be a faithful representation of the highest peak
 869         // since the previous update, since there are frames we won't draw),
 870         // but the _peak_ of the peak meters will be correct (it's tracked in
 871         // AudioMixer, not here), and that's much more important.
 872         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 873         if (last_update_age < 0.100) {
 874                 return;
 875         }
 876         last_audio_level_callback = now;
 877
 878         post_to_main_thread([=]() {
 879                 ui->vu_meter->set_level(level_lufs);
 880                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 881                         if (bus_index < audio_miniviews.size()) {
 882                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 883                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 884                                 miniview->peak_meter->set_level(
 885                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 886                                 miniview->peak_meter->set_peak(
 887                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 888                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 889
 890                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 891                                 view->peak_meter->set_level(
 892                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 893                                 view->peak_meter->set_peak(
 894                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 895                                 view->reduction_meter->set_reduction_db(level.compressor_attenuation_db);
 896                                 view->gainstaging_knob->blockSignals(true);
 897                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 898                                 view->gainstaging_knob->blockSignals(false);
 899                                 view->gainstaging_db_display->setText(
 900                                         QString("Gain: ") +
 901                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 902                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 903
 904                                 midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
 905                         }
 906                 }
 907                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 908                 ui->correlation_meter->set_correlation(correlation);
 909
 910                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 911                 set_peak_label(ui->peak_display, peak_db);
 912
 913                 // NOTE: Will be invisible when using multitrack audio.
 914                 ui->gainstaging_knob->blockSignals(true);
 915                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 916                 ui->gainstaging_knob->blockSignals(false);
 917                 ui->gainstaging_db_display->setText(
 918                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 919
 920                 ui->makeup_gain_knob->blockSignals(true);
 921                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 922                 ui->makeup_gain_knob->blockSignals(false);
 923                 ui->makeup_gain_db_display->setText(
 924                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 925                 ui->makeup_gain_db_display_2->setText(
 926                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 927
 928                 // Peak labels could have changed.
 929                 midi_mapper.refresh_lights();
 930         });
 931 }
 932
 933 void MainWindow::relayout()
 934 {
 935         int height = ui->vertical_layout->geometry().height();
 936         if (height <= 0) {
 937                 // Seemingly this can happen and must be ignored.
 938                 return;
 939         }
 940
 941         double remaining_height = height;
 942
 943         // Allocate the height; the most important part is to keep the main displays
 944         // at the right aspect if at all possible.
 945         double me_width = ui->me_preview->width();
 946         double me_height = me_width * double(global_flags.height) / double(global_flags.width) + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 947
 948         // TODO: Scale the widths when we need to do this.
 949         if (me_height / double(height) > 0.8) {
 950                 me_height = height * 0.8;
 951         }
 952         remaining_height -= me_height + ui->vertical_layout->spacing();
 953
 954         // Space between the M/E displays and the audio strip.
 955         remaining_height -= ui->vertical_layout->spacing();
 956
 957         // The label above the audio strip.
 958         double compact_label_height = ui->compact_label->minimumHeight() +
 959                 ui->compact_audio_layout->spacing();
 960         remaining_height -= compact_label_height;
 961
 962         // The previews will be constrained by the remaining height, and the width.
 963         double preview_label_height = previews[0]->label->minimumSize().height() +
 964                 previews[0]->main_vertical_layout->spacing();
 965         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 966         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * double(global_flags.height) / double(global_flags.width));
 967         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 968
 969         ui->vertical_layout->setStretch(0, lrintf(me_height));
 970         ui->vertical_layout->setStretch(1,
 971                 lrintf(compact_label_height) +
 972                 lrintf(remaining_height) +
 973                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 974
 975         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 976         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 977         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 978
 979         if (current_audio_view == 0) {  // Compact audio view.
 980                 // Set the widths for the previews.
 981                 double preview_width = preview_height * double(global_flags.width) / double(global_flags.height);
 982                 for (unsigned i = 0; i < previews.size(); ++i) {
 983                         ui->preview_displays->setStretch(i, lrintf(preview_width));
 984                 }
 985
 986                 // The preview horizontal spacer.
 987                 double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 988                 ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 989         } else if (current_audio_view == 2) {  // Video grid view.
 990                 // QGridLayout doesn't do it for us, since we need to be able to remove rows
 991                 // or columns as the grid changes, and it won't do that. Thus, position everything
 992                 // by hand.
 993                 constexpr int spacing = 6;
 994                 int grid_width = ui->preview_displays_grid->geometry().width();
 995                 int grid_height = ui->preview_displays_grid->geometry().height();
 996                 int best_preview_width = 0;
 997                 unsigned best_num_rows = 1, best_num_cols = 1;
 998                 for (unsigned num_rows = 1; num_rows <= previews.size(); ++num_rows) {
 999                         int num_cols = (previews.size() + num_rows - 1) / num_rows;
1000
1001                         int max_preview_height = (grid_height - spacing * (num_rows - 1)) / num_rows - preview_label_height;
1002                         int max_preview_width = (grid_width - spacing * (num_cols - 1)) / num_cols;
1003                         int preview_width = std::min<int>(max_preview_width, max_preview_height * double(global_flags.width) / double(global_flags.height));
1004
1005                         if (preview_width > best_preview_width) {
1006                                 best_preview_width = preview_width;
1007                                 best_num_rows = num_rows;
1008                                 best_num_cols = num_cols;
1009                         }
1010                 }
1011
1012                 double cell_height = lrintf(best_preview_width * double(global_flags.height) / double(global_flags.width)) + preview_label_height;
1013                 remaining_height = grid_height - best_num_rows * cell_height - (best_num_rows - 1) * spacing;
1014                 int cell_width = best_preview_width;
1015                 int remaining_width = grid_width - best_num_cols * cell_width - (best_num_cols - 1) * spacing;
1016
1017                 for (unsigned i = 0; i < previews.size(); ++i) {
1018                         int col_idx = i % best_num_cols;
1019                         int row_idx = i / best_num_cols;
1020
1021                         double top = remaining_height * 0.5f + row_idx * (cell_height + spacing);
1022                         double bottom = top + cell_height;
1023                         double left = remaining_width * 0.5f + col_idx * (cell_width + spacing);
1024                         double right = left + cell_width;
1025
1026                         QRect rect;
1027                         rect.setTop(lrintf(top));
1028                         rect.setBottom(lrintf(bottom));
1029                         rect.setLeft(lrintf(left));
1030                         rect.setRight(lrintf(right));
1031
1032                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1033                         display->setGeometry(rect);
1034                         display->show();
1035                 }
1036         }
1037 }
1038
1039 void MainWindow::set_locut(float value)
1040 {
1041         set_relative_value(ui->locut_cutoff_knob, value);
1042 }
1043
1044 void MainWindow::set_limiter_threshold(float value)
1045 {
1046         set_relative_value(ui->limiter_threshold_knob, value);
1047 }
1048
1049 void MainWindow::set_makeup_gain(float value)
1050 {
1051         set_relative_value(ui->makeup_gain_knob, value);
1052 }
1053
1054 void MainWindow::set_treble(unsigned bus_idx, float value)
1055 {
1056         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
1057 }
1058
1059 void MainWindow::set_mid(unsigned bus_idx, float value)
1060 {
1061         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
1062 }
1063
1064 void MainWindow::set_bass(unsigned bus_idx, float value)
1065 {
1066         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
1067 }
1068
1069 void MainWindow::set_gain(unsigned bus_idx, float value)
1070 {
1071         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
1072 }
1073
1074 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
1075 {
1076         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
1077 }
1078
1079 void MainWindow::set_fader(unsigned bus_idx, float value)
1080 {
1081         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
1082 }
1083
1084 void MainWindow::toggle_mute(unsigned bus_idx)
1085 {
1086         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
1087 }
1088
1089 void MainWindow::toggle_locut(unsigned bus_idx)
1090 {
1091         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
1092 }
1093
1094 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
1095 {
1096         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
1097 }
1098
1099 void MainWindow::toggle_compressor(unsigned bus_idx)
1100 {
1101         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
1102 }
1103
1104 void MainWindow::clear_peak(unsigned bus_idx)
1105 {
1106         post_to_main_thread([=]{
1107                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1108                         global_audio_mixer->reset_peak(bus_idx);
1109                         midi_mapper.set_has_peaked(bus_idx, false);
1110                         midi_mapper.refresh_lights();
1111                 }
1112         });
1113 }
1114
1115 void MainWindow::clear_all_highlights()
1116 {
1117         post_to_main_thread([this]{
1118                 highlight_locut(false);
1119                 highlight_limiter_threshold(false);
1120                 highlight_makeup_gain(false);
1121                 highlight_toggle_limiter(false);
1122                 highlight_toggle_auto_makeup_gain(false);
1123                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
1124                         highlight_treble(bus_idx, false);
1125                         highlight_mid(bus_idx, false);
1126                         highlight_bass(bus_idx, false);
1127                         highlight_gain(bus_idx, false);
1128                         highlight_compressor_threshold(bus_idx, false);
1129                         highlight_fader(bus_idx, false);
1130                         highlight_mute(bus_idx, false);
1131                         highlight_toggle_locut(bus_idx, false);
1132                         highlight_toggle_auto_gain_staging(bus_idx, false);
1133                         highlight_toggle_compressor(bus_idx, false);
1134                 }
1135         });
1136 }
1137
1138 void MainWindow::toggle_limiter()
1139 {
1140         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1141                 ui->limiter_enabled->click();
1142         }
1143 }
1144
1145 void MainWindow::toggle_auto_makeup_gain()
1146 {
1147         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1148                 ui->makeup_gain_auto_checkbox->click();
1149         }
1150 }
1151
1152 void MainWindow::highlight_locut(bool highlight)
1153 {
1154         post_to_main_thread([this, highlight]{
1155                 highlight_control(ui->locut_cutoff_knob, highlight);
1156                 highlight_control(ui->locut_cutoff_knob_2, highlight);
1157         });
1158 }
1159
1160 void MainWindow::highlight_limiter_threshold(bool highlight)
1161 {
1162         post_to_main_thread([this, highlight]{
1163                 highlight_control(ui->limiter_threshold_knob, highlight);
1164                 highlight_control(ui->limiter_threshold_knob_2, highlight);
1165         });
1166 }
1167
1168 void MainWindow::highlight_makeup_gain(bool highlight)
1169 {
1170         post_to_main_thread([this, highlight]{
1171                 highlight_control(ui->makeup_gain_knob, highlight);
1172                 highlight_control(ui->makeup_gain_knob_2, highlight);
1173         });
1174 }
1175
1176 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
1177 {
1178         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
1179 }
1180
1181 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
1182 {
1183         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
1184 }
1185
1186 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
1187 {
1188         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
1189 }
1190
1191 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
1192 {
1193         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
1194 }
1195
1196 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
1197 {
1198         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
1199 }
1200
1201 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1202 {
1203         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1204 }
1205
1206 void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
1207 {
1208         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
1209 }
1210
1211 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1212 {
1213         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1214 }
1215
1216 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1217 {
1218         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1219 }
1220
1221 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1222 {
1223         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1224 }
1225
1226 void MainWindow::highlight_toggle_limiter(bool highlight)
1227 {
1228         post_to_main_thread([this, highlight]{
1229                 highlight_control(ui->limiter_enabled, highlight);
1230                 highlight_control(ui->limiter_enabled_2, highlight);
1231         });
1232 }
1233
1234 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1235 {
1236         post_to_main_thread([this, highlight]{
1237                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1238                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1239         });
1240 }
1241
1242 template<class T>
1243 void MainWindow::set_relative_value(T *control, float value)
1244 {
1245         post_to_main_thread([control, value]{
1246                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1247         });
1248 }
1249
1250 template<class T>
1251 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1252 {
1253         if (global_audio_mixer != nullptr &&
1254             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1255             bus_idx < audio_expanded_views.size()) {
1256                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1257         }
1258 }
1259
1260 template<class T>
1261 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1262 {
1263         post_to_main_thread([this, bus_idx, control]{
1264                 if (global_audio_mixer != nullptr &&
1265                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1266                     bus_idx < audio_expanded_views.size()) {
1267                         (audio_expanded_views[bus_idx]->*control)->click();
1268                 }
1269         });
1270 }
1271
1272 template<class T>
1273 void MainWindow::highlight_control(T *control, bool highlight)
1274 {
1275         if (control == nullptr) {
1276                 return;
1277         }
1278         if (global_audio_mixer == nullptr ||
1279             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1280                 highlight = false;
1281         }
1282         if (highlight) {
1283                 control->setStyleSheet("background: rgb(0,255,0,80)");
1284         } else {
1285                 control->setStyleSheet("");
1286         }
1287 }
1288
1289 template<class T>
1290 void MainWindow::highlight_mute_control(T *control, bool highlight)
1291 {
1292         if (control == nullptr) {
1293                 return;
1294         }
1295         if (global_audio_mixer == nullptr ||
1296             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1297                 highlight = false;
1298         }
1299         if (highlight) {
1300                 control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
1301         } else {
1302                 control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
1303         }
1304 }
1305
1306 template<class T>
1307 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
1308 {
1309         post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
1310                 if (bus_idx < audio_expanded_views.size()) {
1311                         if (is_mute_button) {
1312                                 highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
1313                         } else {
1314                                 highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1315                         }
1316                 }
1317         });
1318 }
1319
1320 void MainWindow::set_transition_names(vector<string> transition_names)
1321 {
1322         if (transition_names.size() < 1 || transition_names[0].empty()) {
1323                 transition_btn1->setText(QString(""));
1324         } else {
1325                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1326                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1327         }
1328         if (transition_names.size() < 2 || transition_names[1].empty()) {
1329                 transition_btn2->setText(QString(""));
1330         } else {
1331                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1332                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1333         }
1334         if (transition_names.size() < 3 || transition_names[2].empty()) {
1335                 transition_btn3->setText(QString(""));
1336         } else {
1337                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1338                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1339         }
1340 }
1341
1342 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1343 {
1344         if (output >= Mixer::OUTPUT_INPUT0) {
1345                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1346                 previews[channel]->label->setText(name.c_str());
1347         }
1348
1349         analyzer->update_channel_name(output, name);
1350 }
1351
1352 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1353 {
1354         if (output >= Mixer::OUTPUT_INPUT0) {
1355                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1356                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1357         }
1358 }
1359
1360 void MainWindow::transition_clicked(int transition_number)
1361 {
1362         global_mixer->transition_clicked(transition_number);
1363 }
1364
1365 void MainWindow::channel_clicked(int channel_number)
1366 {
1367         if (current_wb_pick_display == channel_number) {
1368                 // The picking was already done from eventFilter(), since we don't get
1369                 // the mouse pointer here.
1370         } else {
1371                 global_mixer->channel_clicked(channel_number);
1372         }
1373 }
1374
1375 void MainWindow::quick_cut_activated(int channel_number)
1376 {
1377         if (!global_flags.enable_quick_cut_keys) {
1378                 return;
1379         }
1380         global_mixer->channel_clicked(channel_number);
1381         global_mixer->transition_clicked(0);
1382 }
1383
1384 void MainWindow::wb_button_clicked(int channel_number)
1385 {
1386         current_wb_pick_display = channel_number;
1387         QApplication::setOverrideCursor(Qt::CrossCursor);
1388 }
1389
1390 void MainWindow::audio_view_changed(int audio_view)
1391 {
1392         if (audio_view == current_audio_view) {
1393                 return;
1394         }
1395
1396         if (audio_view == 0) {
1397                 // Compact audio view. (1, full audio view, has no video previews.)
1398                 for (unsigned i = 0; i < previews.size(); ++i) {
1399                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1400                         ui->preview_displays->insertWidget(i, display, 1);
1401                 }
1402         } else if (audio_view == 2) {
1403                 // Video grid display.
1404                 for (unsigned i = 0; i < previews.size(); ++i) {
1405                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1406                         display->setParent(ui->preview_displays_grid);
1407                         display->show();
1408                 }
1409         }
1410
1411         current_audio_view = audio_view;
1412
1413         // Ask for a relayout, but only after the event loop is done doing relayout
1414         // on everything else.
1415         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
1416 }
1417
1418 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1419 {
1420         if (current_wb_pick_display != -1 &&
1421             event->type() == QEvent::MouseButtonRelease &&
1422             watched->isWidgetType()) {
1423                 QApplication::restoreOverrideCursor();
1424                 if (watched == previews[current_wb_pick_display]->display) {
1425                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1426                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1427                 } else {
1428                         // The user clicked on something else, give up.
1429                         // (The click goes through, which might not be ideal, but, yes.)
1430                         current_wb_pick_display = -1;
1431                 }
1432         }
1433         return false;
1434 }
1435
1436 void MainWindow::closeEvent(QCloseEvent *event)
1437 {
1438         if (global_mixer->get_num_connected_clients() > 0) {
1439                 QMessageBox::StandardButton reply =
1440                         QMessageBox::question(this, "Nageru", "There are clients connected. Do you really want to quit?",
1441                                 QMessageBox::Yes | QMessageBox::No);
1442                 if (reply != QMessageBox::Yes) {
1443                         event->ignore();
1444                         return;
1445                 }
1446         }
1447
1448         analyzer->hide();
1449         event->accept();
1450 }
1451
1452 namespace {
1453
1454 double srgb_to_linear(double x)
1455 {
1456         if (x < 0.04045) {
1457                 return x / 12.92;
1458         } else {
1459                 return pow((x + 0.055) / 1.055, 2.4);
1460         }
1461 }
1462
1463 }  // namespace
1464
1465 void MainWindow::set_white_balance(int channel_number, int x, int y)
1466 {
1467         // Set the white balance to neutral for the grab. It's probably going to
1468         // flicker a bit, but hopefully this display is not live anyway.
1469         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1470         previews[channel_number]->display->updateGL();
1471         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1472
1473         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1474         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1475         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1476         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1477         previews[channel_number]->display->updateGL();
1478 }
1479
1480 void MainWindow::audio_state_changed()
1481 {
1482         post_to_main_thread([this]{
1483                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
1484                         return;
1485                 }
1486                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1487                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1488                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1489                         string suffix;
1490                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1491                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1492                                 if (state == ALSAPool::Device::State::STARTING) {
1493                                         suffix = " (busy)";
1494                                 } else if (state == ALSAPool::Device::State::DEAD) {
1495                                         suffix = " (dead)";
1496                                 }
1497                         }
1498
1499                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1500                                 QString::fromStdString(bus.name + suffix));
1501                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1502                                 QString::fromStdString(bus.name + suffix));
1503                 }
1504         });
1505 }