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 }  // namespace
 179
 180 MainWindow::MainWindow()
 181         : ui(new Ui::MainWindow), midi_mapper(this)
 182 {
 183         global_mainwindow = this;
 184         ui->setupUi(this);
 185
 186         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 187         disk_free_label = new QLabel(this);
 188         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 189         ui->menuBar->setCornerWidget(disk_free_label);
 190
 191         QActionGroup *audio_mapping_group = new QActionGroup(this);
 192         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 193         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 194
 195         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 196         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 197
 198         // The menus.
 199         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 200         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 201         connect(ui->manual_action, &QAction::triggered, this, &MainWindow::manual_triggered);
 202         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 203         connect(ui->open_analyzer_action, &QAction::triggered, this, &MainWindow::open_analyzer_triggered);
 204         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 205         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 206         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 207         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 208         connect(ui->timecode_stream_action, &QAction::triggered, this, &MainWindow::timecode_stream_triggered);
 209         connect(ui->timecode_stdout_action, &QAction::triggered, this, &MainWindow::timecode_stdout_triggered);
 210
 211         ui->timecode_stream_action->setChecked(global_flags.display_timecode_in_stream);
 212         ui->timecode_stdout_action->setChecked(global_flags.display_timecode_on_stdout);
 213
 214         if (global_flags.x264_video_to_http && isinf(global_flags.x264_crf)) {
 215                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 216         } else {
 217                 ui->x264_bitrate_action->setEnabled(false);
 218         }
 219
 220         connect(ui->video_menu, &QMenu::aboutToShow, [this]{
 221                 fill_hdmi_sdi_output_device_menu(ui->hdmi_sdi_output_device_menu);
 222                 fill_hdmi_sdi_output_resolution_menu(ui->hdmi_sdi_output_resolution_menu);
 223         });
 224
 225         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 226         // TODO: Make them dynamic.
 227         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 228         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 229         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 230
 231         // Aiee...
 232         transition_btn1 = ui->transition_btn1;
 233         transition_btn2 = ui->transition_btn2;
 234         transition_btn3 = ui->transition_btn3;
 235         qRegisterMetaType<string>("std::string");
 236         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 237         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 238         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 239
 240         // Hook up the prev/next buttons on the audio views.
 241         auto prev_page = [this]{
 242                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 243                         ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 2) % 3);
 244                 } else {
 245                         ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 246                 }
 247         };
 248         auto next_page = [this]{
 249                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 250                         ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 1) % 3);
 251                 } else {
 252                         ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
 253                 }
 254         };
 255         connect(ui->compact_prev_page, &QAbstractButton::clicked, prev_page);
 256         connect(ui->compact_next_page, &QAbstractButton::clicked, next_page);
 257         connect(ui->full_prev_page, &QAbstractButton::clicked, prev_page);
 258         connect(ui->full_next_page, &QAbstractButton::clicked, next_page);
 259         connect(ui->video_grid_prev_page, &QAbstractButton::clicked, prev_page);
 260         connect(ui->video_grid_next_page, &QAbstractButton::clicked, next_page);
 261
 262         // And bind the same to PgUp/PgDown.
 263         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, next_page);
 264         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, prev_page);
 265
 266         // When the audio view changes, move the previews.
 267         connect(ui->audio_views, &QStackedWidget::currentChanged, bind(&MainWindow::audio_view_changed, this, _1));
 268
 269         if (global_flags.enable_quick_cut_keys) {
 270                 ui->quick_cut_enable_action->setChecked(true);
 271         }
 272         connect(ui->quick_cut_enable_action, &QAction::changed, [this](){
 273                 global_flags.enable_quick_cut_keys = ui->quick_cut_enable_action->isChecked();
 274         });
 275
 276         last_audio_level_callback = steady_clock::now() - seconds(1);
 277
 278         if (!global_flags.midi_mapping_filename.empty()) {
 279                 MIDIMappingProto midi_mapping;
 280                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 281                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 282                                 global_flags.midi_mapping_filename.c_str());
 283                         exit(1);
 284                 }
 285                 midi_mapper.set_midi_mapping(midi_mapping);
 286         }
 287         midi_mapper.refresh_highlights();
 288         midi_mapper.refresh_lights();
 289 }
 290
 291 void MainWindow::resizeEvent(QResizeEvent* event)
 292 {
 293         QMainWindow::resizeEvent(event);
 294
 295         // Ask for a relayout, but only after the event loop is done doing relayout
 296         // on everything else.
 297         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 298 }
 299
 300 void MainWindow::mixer_created(Mixer *mixer)
 301 {
 302         // Make the previews.
 303         unsigned num_previews = mixer->get_num_channels();
 304
 305         const char qwerty[] = "QWERTYUIOP";
 306         for (unsigned i = 0; i < num_previews; ++i) {
 307                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 308
 309                 QWidget *preview = new QWidget(this);  // Will be connected to a layout immediately after the loop.
 310                 Ui::Display *ui_display = new Ui::Display;
 311                 ui_display->setupUi(preview);
 312                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 313                 ui_display->display->set_output(output);
 314                 previews.push_back(ui_display);
 315
 316                 // Hook up the click.
 317                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 318
 319                 // Let the theme update the text whenever the resolution or color changed.
 320                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 321                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 322
 323                 // Hook up the keyboard key.
 324                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 325                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 326
 327                 // Hook up the quick-cut key.
 328                 if (i < strlen(qwerty)) {
 329                         QShortcut *shortcut = new QShortcut(QKeySequence(qwerty[i]), this);
 330                         connect(shortcut, &QShortcut::activated, bind(&MainWindow::quick_cut_activated, this, i));
 331                 }
 332
 333                 // Hook up the white balance button (irrelevant if invisible).
 334                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 335                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 336         }
 337
 338         // Connect the previews to the correct layout.
 339         audio_view_changed(ui->audio_views->currentIndex());
 340
 341         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 342
 343         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 344         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 345         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 346         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 347         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 348
 349         reset_audio_mapping_ui();
 350
 351         // TODO: Fetch all of the values these for completeness,
 352         // not just the enable knobs implied by flags.
 353         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 354         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 355
 356         // Controls used only for simple audio fetch their state from the first bus.
 357         constexpr unsigned simple_bus_index = 0;
 358         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 359                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 360                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 361                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 362                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 363                 ui->compressor_threshold_db_display->setText(
 364                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 365         }
 366         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 367                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 368                 midi_mapper.refresh_lights();
 369         });
 370         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 371                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 372         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 373                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 374                 midi_mapper.refresh_lights();
 375         });
 376         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 377                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 378         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 379                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 380                 midi_mapper.refresh_lights();
 381         });
 382
 383         // Global mastering controls.
 384         QString limiter_threshold_label(
 385                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 386         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 387         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 388
 389         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 390         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 391
 392         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 393         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 394                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 395                 midi_mapper.refresh_lights();
 396         });
 397
 398         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 399         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 400                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 401                 midi_mapper.refresh_lights();
 402         });
 403         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 404         // Even though we have a reset button right next to it, the fact that
 405         // the expanded audio view labels are clickable makes it natural to
 406         // click this one as well.
 407         connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
 408         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 409
 410         midi_mapper.refresh_highlights();
 411         midi_mapper.refresh_lights();
 412         midi_mapper.start_thread();
 413
 414         analyzer.reset(new Analyzer);
 415
 416         global_mixer->set_theme_menu_callback(bind(&MainWindow::setup_theme_menu, this));
 417         setup_theme_menu();
 418
 419         struct sigaction act;
 420         memset(&act, 0, sizeof(act));
 421         act.sa_handler = schedule_cut_signal;
 422         act.sa_flags = SA_RESTART;
 423         sigaction(SIGHUP, &act, nullptr);
 424
 425         // Mostly for debugging. Don't override SIGINT, that's so evil if
 426         // shutdown isn't instant.
 427         memset(&act, 0, sizeof(act));
 428         act.sa_handler = quit_signal;
 429         act.sa_flags = SA_RESTART;
 430         sigaction(SIGUSR1, &act, nullptr);
 431 }
 432
 433 void MainWindow::reset_audio_mapping_ui()
 434 {
 435         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 436
 437         ui->simple_audio_mode->setChecked(simple);
 438         ui->multichannel_audio_mode->setChecked(!simple);
 439         ui->input_mapping_action->setEnabled(!simple);
 440         ui->midi_mapping_action->setEnabled(!simple);
 441
 442         ui->locut_enabled->setVisible(simple);
 443         ui->gainstaging_label->setVisible(simple);
 444         ui->gainstaging_knob->setVisible(simple);
 445         ui->gainstaging_db_display->setVisible(simple);
 446         ui->gainstaging_auto_checkbox->setVisible(simple);
 447         ui->compressor_threshold_label->setVisible(simple);
 448         ui->compressor_threshold_knob->setVisible(simple);
 449         ui->compressor_threshold_db_display->setVisible(simple);
 450         ui->compressor_enabled->setVisible(simple);
 451
 452         setup_audio_miniview();
 453         setup_audio_expanded_view();
 454
 455         if (simple) {
 456                 ui->compact_label->setText("Compact audio view (1/2)  ");
 457                 ui->video_grid_label->setText("Video grid display (2/2)  ");
 458                 if (ui->audio_views->currentIndex() == 1) {
 459                         // Full audio view is not available in simple mode.
 460                         ui->audio_views->setCurrentIndex(0);
 461                 }
 462         } else {
 463                 ui->compact_label->setText("Compact audio view (1/3)  ");
 464                 ui->full_label->setText("Full audio view (2/3)  ");
 465                 ui->video_grid_label->setText("Video grid display (3/3)  ");
 466         }
 467
 468         midi_mapper.refresh_highlights();
 469         midi_mapper.refresh_lights();
 470 }
 471
 472 void MainWindow::setup_audio_miniview()
 473 {
 474         // Remove any existing channels.
 475         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 476                 delete item->widget();
 477                 delete item;
 478         }
 479         audio_miniviews.clear();
 480
 481         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 482                 return;
 483         }
 484
 485         // Set up brand new ones from the input mapping.
 486         InputMapping mapping = global_audio_mixer->get_input_mapping();
 487         audio_miniviews.resize(mapping.buses.size());
 488         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 489                 QWidget *channel = new QWidget(this);
 490                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 491                 ui_audio_miniview->setupUi(channel);
 492                 ui_audio_miniview->bus_desc_label->setFullText(
 493                         QString::fromStdString(mapping.buses[bus_index].name));
 494                 audio_miniviews[bus_index] = ui_audio_miniview;
 495
 496                 // Set up the peak meter.
 497                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 498                 peak_meter->set_min_level(-30.0f);
 499                 peak_meter->set_max_level(0.0f);
 500                 peak_meter->set_ref_level(0.0f);
 501
 502                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 503
 504                 ui->faders->addWidget(channel);
 505
 506                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 507                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 508                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 509                         [bus_index]() {
 510                                 global_audio_mixer->reset_peak(bus_index);
 511                         });
 512         }
 513 }
 514
 515 void MainWindow::setup_audio_expanded_view()
 516 {
 517         // Remove any existing channels.
 518         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 519                 delete item->widget();
 520                 delete item;
 521         }
 522         audio_expanded_views.clear();
 523
 524         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 525                 return;
 526         }
 527
 528         // Set up brand new ones from the input mapping.
 529         InputMapping mapping = global_audio_mixer->get_input_mapping();
 530         audio_expanded_views.resize(mapping.buses.size());
 531         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 532                 QWidget *channel = new QWidget(this);
 533                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 534                 ui_audio_expanded_view->setupUi(channel);
 535                 ui_audio_expanded_view->bus_desc_label->setFullText(
 536                         QString::fromStdString(mapping.buses[bus_index].name));
 537                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 538                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 539                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 540                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 541                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 542                 ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index));
 543                 connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
 544                         bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
 545                 ui->buses->addWidget(channel);
 546
 547                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 548                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 549                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 550                         midi_mapper.refresh_lights();
 551                 });
 552
 553                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 554                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 555                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 556                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 557                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 558                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 559
 560                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 561                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 562                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 563
 564                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 565                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 566                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 567                         midi_mapper.refresh_lights();
 568                 });
 569
 570                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 571                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 572                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 573                         midi_mapper.refresh_lights();
 574                 });
 575
 576                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 577
 578                 // Set up the peak meter.
 579                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 580                 peak_meter->set_min_level(-30.0f);
 581                 peak_meter->set_max_level(0.0f);
 582                 peak_meter->set_ref_level(0.0f);
 583
 584                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 585                         [this, bus_index]() {
 586                                 global_audio_mixer->reset_peak(bus_index);
 587                                 midi_mapper.refresh_lights();
 588                         });
 589         }
 590
 591         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 592 }
 593
 594 void MainWindow::mixer_shutting_down()
 595 {
 596         ui->me_live->shutdown();
 597         ui->me_preview->shutdown();
 598
 599         for (Ui::Display *display : previews) {
 600                 display->display->shutdown();
 601         }
 602
 603         analyzer->mixer_shutting_down();
 604 }
 605
 606 void MainWindow::cut_triggered()
 607 {
 608         global_mixer->schedule_cut();
 609 }
 610
 611 void MainWindow::x264_bitrate_triggered()
 612 {
 613         bool ok;
 614         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);
 615         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 616                 global_flags.x264_bitrate = new_bitrate;
 617                 global_mixer->change_x264_bitrate(new_bitrate);
 618         }
 619 }
 620
 621 void MainWindow::exit_triggered()
 622 {
 623         close();
 624 }
 625
 626 void MainWindow::manual_triggered()
 627 {
 628         if (!QDesktopServices::openUrl(QUrl("https://nageru.sesse.net/doc/"))) {
 629                 QMessageBox msgbox;
 630                 msgbox.setText("Could not launch manual in web browser.\nPlease see https://nageru.sesse.net/doc/ manually.");
 631                 msgbox.exec();
 632         }
 633 }
 634
 635 void MainWindow::about_triggered()
 636 {
 637         AboutDialog().exec();
 638 }
 639
 640 void MainWindow::open_analyzer_triggered()
 641 {
 642         analyzer->show();
 643 }
 644
 645 void MainWindow::simple_audio_mode_triggered()
 646 {
 647         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 648                 return;
 649         }
 650         unsigned card_index = global_audio_mixer->get_simple_input();
 651         if (card_index == numeric_limits<unsigned>::max()) {
 652                 QMessageBox::StandardButton reply =
 653                         QMessageBox::question(this,
 654                                 "Mapping too complex",
 655                                 "The current audio mapping is too complicated to be representable in simple mode, "
 656                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 657                                 QMessageBox::Yes | QMessageBox::No);
 658                 if (reply == QMessageBox::No) {
 659                         ui->simple_audio_mode->setChecked(false);
 660                         ui->multichannel_audio_mode->setChecked(true);
 661                         return;
 662                 }
 663                 card_index = 0;
 664         }
 665         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 666         reset_audio_mapping_ui();
 667 }
 668
 669 void MainWindow::multichannel_audio_mode_triggered()
 670 {
 671         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 672                 return;
 673         }
 674
 675         // Take the generated input mapping from the simple input,
 676         // and set it as a normal multichannel mapping, which causes
 677         // the mode to go to multichannel.
 678         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 679         reset_audio_mapping_ui();
 680 }
 681
 682 void MainWindow::input_mapping_triggered()
 683 {
 684         if (InputMappingDialog().exec() == QDialog::Accepted) {
 685                 setup_audio_miniview();
 686                 setup_audio_expanded_view();
 687         }
 688         midi_mapper.refresh_highlights();
 689         midi_mapper.refresh_lights();
 690 }
 691
 692 void MainWindow::midi_mapping_triggered()
 693 {
 694         MIDIMappingDialog(&midi_mapper).exec();
 695 }
 696
 697 void MainWindow::timecode_stream_triggered()
 698 {
 699         global_mixer->set_display_timecode_in_stream(ui->timecode_stream_action->isChecked());
 700 }
 701
 702 void MainWindow::timecode_stdout_triggered()
 703 {
 704         global_mixer->set_display_timecode_on_stdout(ui->timecode_stdout_action->isChecked());
 705 }
 706
 707 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 708 {
 709         if (bus_index == 0) {
 710                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 711         }
 712         if (bus_index < audio_expanded_views.size()) {
 713                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 714         }
 715
 716         float gain_db = value * 0.1f;
 717         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 718
 719         // The label will be updated by the audio level callback.
 720 }
 721
 722 void MainWindow::final_makeup_gain_knob_changed(int value)
 723 {
 724         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 725
 726         float gain_db = value * 0.1f;
 727         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 728
 729         // The label will be updated by the audio level callback.
 730 }
 731
 732 void MainWindow::cutoff_knob_changed(int value)
 733 {
 734         float octaves = value * 0.1f;
 735         float cutoff_hz = 20.0 * pow(2.0, octaves);
 736         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 737         update_cutoff_labels(cutoff_hz);
 738 }
 739
 740 void MainWindow::update_cutoff_labels(float cutoff_hz)
 741 {
 742         char buf[256];
 743         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 744         ui->locut_cutoff_display->setText(buf);
 745         ui->locut_cutoff_display_2->setText(buf);
 746
 747         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 748                 audio_expanded_views[bus_index]->locut_enabled->setText(
 749                         QString("Lo-cut: ") + buf);
 750         }
 751 }
 752
 753 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 754 {
 755         char time_str[256];
 756         if (estimated_seconds_left < 60.0) {
 757                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 758         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 759                 int s = lrintf(estimated_seconds_left);
 760                 int m = s / 60;
 761                 s %= 60;
 762                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 763         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 764                 int m = lrintf(estimated_seconds_left / 60.0);
 765                 snprintf(time_str, sizeof(time_str), "%dm", m);
 766         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 767                 int m = lrintf(estimated_seconds_left / 60.0);
 768                 int h = m / 60;
 769                 m %= 60;
 770                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 771         } else {  // More than ten hours: Xh.
 772                 int h = lrintf(estimated_seconds_left / 3600.0);
 773                 snprintf(time_str, sizeof(time_str), "%dh", h);
 774         }
 775         char buf[256];
 776         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 777
 778         std::string label = buf;
 779
 780         post_to_main_thread([this, label]{
 781                 disk_free_label->setText(QString::fromStdString(label));
 782                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 783         });
 784 }
 785
 786 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 787 {
 788         float gain_db = value * 0.1f;
 789         global_audio_mixer->set_eq(bus_index, band, gain_db);
 790
 791         update_eq_label(bus_index, band, gain_db);
 792 }
 793
 794 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 795 {
 796         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 797         string db_string = format_db(gain_db, DB_WITH_SIGN);
 798         switch (band) {
 799         case EQ_BAND_TREBLE:
 800                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 801                 break;
 802         case EQ_BAND_MID:
 803                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 804                 break;
 805         case EQ_BAND_BASS:
 806                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 807                 break;
 808         default:
 809                 assert(false);
 810         }
 811 }
 812
 813 void MainWindow::setup_theme_menu()
 814 {
 815         std::vector<Theme::MenuEntry> theme_menu_entries = global_mixer->get_theme_menu();
 816
 817         if (theme_menu != nullptr) {
 818                 ui->menuBar->removeAction(theme_menu->menuAction());
 819                 theme_menu = nullptr;
 820         }
 821
 822         if (!theme_menu_entries.empty()) {
 823                 theme_menu = new QMenu("&Theme");
 824                 for (const Theme::MenuEntry &entry : theme_menu_entries) {
 825                         QAction *action = theme_menu->addAction(QString::fromStdString(entry.text));
 826                         connect(action, &QAction::triggered, [entry] {
 827                                 global_mixer->theme_menu_entry_clicked(entry.lua_ref);
 828                         });
 829                 }
 830                 ui->menuBar->insertMenu(ui->menu_Help->menuAction(), theme_menu);
 831         }
 832 }
 833
 834 void MainWindow::limiter_threshold_knob_changed(int value)
 835 {
 836         float threshold_dbfs = value * 0.1f;
 837         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 838         ui->limiter_threshold_db_display->setText(
 839                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 840         ui->limiter_threshold_db_display_2->setText(
 841                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 842 }
 843
 844 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 845 {
 846         float threshold_dbfs = value * 0.1f;
 847         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 848
 849         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 850         if (bus_index == 0) {
 851                 ui->compressor_threshold_db_display->setText(label);
 852         }
 853         if (bus_index < audio_expanded_views.size()) {
 854                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 855         }
 856 }
 857
 858 void MainWindow::mini_fader_changed(int bus, double volume_db)
 859 {
 860         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 861         audio_miniviews[bus]->fader_label->setText(label);
 862         audio_expanded_views[bus]->fader_label->setText(label);
 863
 864         global_audio_mixer->set_fader_volume(bus, volume_db);
 865 }
 866
 867 void MainWindow::mute_button_toggled(int bus, bool checked)
 868 {
 869         global_audio_mixer->set_mute(bus, checked);
 870         midi_mapper.refresh_lights();
 871 }
 872
 873 void MainWindow::reset_meters_button_clicked()
 874 {
 875         global_audio_mixer->reset_meters();
 876         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 877         ui->peak_display->setStyleSheet("");
 878 }
 879
 880 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 881                                       float global_level_lufs,
 882                                       float range_low_lufs, float range_high_lufs,
 883                                       float final_makeup_gain_db,
 884                                       float correlation)
 885 {
 886         steady_clock::time_point now = steady_clock::now();
 887
 888         // The meters are somewhat inefficient to update. Only update them
 889         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 890         // means that the digital peak meters are ever so slightly too low
 891         // (each update won't be a faithful representation of the highest peak
 892         // since the previous update, since there are frames we won't draw),
 893         // but the _peak_ of the peak meters will be correct (it's tracked in
 894         // AudioMixer, not here), and that's much more important.
 895         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 896         if (last_update_age < 0.100) {
 897                 return;
 898         }
 899         last_audio_level_callback = now;
 900
 901         post_to_main_thread([=]() {
 902                 ui->vu_meter->set_level(level_lufs);
 903                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 904                         if (bus_index < audio_miniviews.size()) {
 905                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 906                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 907                                 miniview->peak_meter->set_level(
 908                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 909                                 miniview->peak_meter->set_peak(
 910                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 911                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 912
 913                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 914                                 view->peak_meter->set_level(
 915                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 916                                 view->peak_meter->set_peak(
 917                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 918                                 view->reduction_meter->set_reduction_db(level.compressor_attenuation_db);
 919                                 view->gainstaging_knob->blockSignals(true);
 920                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 921                                 view->gainstaging_knob->blockSignals(false);
 922                                 view->gainstaging_db_display->setText(
 923                                         QString("Gain: ") +
 924                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 925                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 926
 927                                 midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
 928                         }
 929                 }
 930                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 931                 ui->correlation_meter->set_correlation(correlation);
 932
 933                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 934                 set_peak_label(ui->peak_display, peak_db);
 935
 936                 // NOTE: Will be invisible when using multitrack audio.
 937                 ui->gainstaging_knob->blockSignals(true);
 938                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 939                 ui->gainstaging_knob->blockSignals(false);
 940                 ui->gainstaging_db_display->setText(
 941                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 942
 943                 ui->makeup_gain_knob->blockSignals(true);
 944                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 945                 ui->makeup_gain_knob->blockSignals(false);
 946                 ui->makeup_gain_db_display->setText(
 947                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 948                 ui->makeup_gain_db_display_2->setText(
 949                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 950
 951                 // Peak labels could have changed.
 952                 midi_mapper.refresh_lights();
 953         });
 954 }
 955
 956 void MainWindow::relayout()
 957 {
 958         int height = ui->vertical_layout->geometry().height();
 959         if (height <= 0) {
 960                 // Seemingly this can happen and must be ignored.
 961                 return;
 962         }
 963
 964         double remaining_height = height;
 965
 966         // Allocate the height; the most important part is to keep the main displays
 967         // at the right aspect if at all possible.
 968         double me_width = ui->me_preview->width();
 969         double me_height = me_width * double(global_flags.height) / double(global_flags.width) + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 970
 971         // TODO: Scale the widths when we need to do this.
 972         if (me_height / double(height) > 0.8) {
 973                 me_height = height * 0.8;
 974         }
 975         remaining_height -= me_height + ui->vertical_layout->spacing();
 976
 977         // Space between the M/E displays and the audio strip.
 978         remaining_height -= ui->vertical_layout->spacing();
 979
 980         // The label above the audio strip.
 981         double compact_label_height = ui->compact_label->minimumHeight() +
 982                 ui->compact_audio_layout->spacing();
 983         remaining_height -= compact_label_height;
 984
 985         // The previews will be constrained by the remaining height, and the width.
 986         double preview_label_height = previews[0]->label->minimumSize().height() +
 987                 previews[0]->main_vertical_layout->spacing();
 988         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 989         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * double(global_flags.height) / double(global_flags.width));
 990         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 991
 992         ui->vertical_layout->setStretch(0, lrintf(me_height));
 993         ui->vertical_layout->setStretch(1,
 994                 lrintf(compact_label_height) +
 995                 lrintf(remaining_height) +
 996                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 997
 998         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 999         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
1000         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
1001
1002         if (current_audio_view == 0) {  // Compact audio view.
1003                 // Set the widths for the previews.
1004                 double preview_width = preview_height * double(global_flags.width) / double(global_flags.height);
1005                 for (unsigned i = 0; i < previews.size(); ++i) {
1006                         ui->preview_displays->setStretch(i, lrintf(preview_width));
1007                 }
1008
1009                 // The preview horizontal spacer.
1010                 double remaining_preview_width = preview_total_width - previews.size() * preview_width;
1011                 ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
1012         } else if (current_audio_view == 2) {  // Video grid view.
1013                 // QGridLayout doesn't do it for us, since we need to be able to remove rows
1014                 // or columns as the grid changes, and it won't do that. Thus, position everything
1015                 // by hand.
1016                 constexpr int spacing = 6;
1017                 int grid_width = ui->preview_displays_grid->geometry().width();
1018                 int grid_height = ui->preview_displays_grid->geometry().height();
1019                 int best_preview_width = 0;
1020                 unsigned best_num_rows = 1, best_num_cols = 1;
1021                 for (unsigned num_rows = 1; num_rows <= previews.size(); ++num_rows) {
1022                         int num_cols = (previews.size() + num_rows - 1) / num_rows;
1023
1024                         int max_preview_height = (grid_height - spacing * (num_rows - 1)) / num_rows - preview_label_height;
1025                         int max_preview_width = (grid_width - spacing * (num_cols - 1)) / num_cols;
1026                         int preview_width = std::min<int>(max_preview_width, max_preview_height * double(global_flags.width) / double(global_flags.height));
1027
1028                         if (preview_width > best_preview_width) {
1029                                 best_preview_width = preview_width;
1030                                 best_num_rows = num_rows;
1031                                 best_num_cols = num_cols;
1032                         }
1033                 }
1034
1035                 double cell_height = lrintf(best_preview_width * double(global_flags.height) / double(global_flags.width)) + preview_label_height;
1036                 remaining_height = grid_height - best_num_rows * cell_height - (best_num_rows - 1) * spacing;
1037                 int cell_width = best_preview_width;
1038                 int remaining_width = grid_width - best_num_cols * cell_width - (best_num_cols - 1) * spacing;
1039
1040                 for (unsigned i = 0; i < previews.size(); ++i) {
1041                         int col_idx = i % best_num_cols;
1042                         int row_idx = i / best_num_cols;
1043
1044                         double top = remaining_height * 0.5f + row_idx * (cell_height + spacing);
1045                         double bottom = top + cell_height;
1046                         double left = remaining_width * 0.5f + col_idx * (cell_width + spacing);
1047                         double right = left + cell_width;
1048
1049                         QRect rect;
1050                         rect.setTop(lrintf(top));
1051                         rect.setBottom(lrintf(bottom));
1052                         rect.setLeft(lrintf(left));
1053                         rect.setRight(lrintf(right));
1054
1055                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1056                         display->setGeometry(rect);
1057                         display->show();
1058                 }
1059         }
1060 }
1061
1062 void MainWindow::set_locut(float value)
1063 {
1064         set_relative_value(ui->locut_cutoff_knob, value);
1065 }
1066
1067 void MainWindow::set_limiter_threshold(float value)
1068 {
1069         set_relative_value(ui->limiter_threshold_knob, value);
1070 }
1071
1072 void MainWindow::set_makeup_gain(float value)
1073 {
1074         set_relative_value(ui->makeup_gain_knob, value);
1075 }
1076
1077 void MainWindow::set_treble(unsigned bus_idx, float value)
1078 {
1079         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
1080 }
1081
1082 void MainWindow::set_mid(unsigned bus_idx, float value)
1083 {
1084         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
1085 }
1086
1087 void MainWindow::set_bass(unsigned bus_idx, float value)
1088 {
1089         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
1090 }
1091
1092 void MainWindow::set_gain(unsigned bus_idx, float value)
1093 {
1094         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
1095 }
1096
1097 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
1098 {
1099         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
1100 }
1101
1102 void MainWindow::set_fader(unsigned bus_idx, float value)
1103 {
1104         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
1105 }
1106
1107 void MainWindow::toggle_mute(unsigned bus_idx)
1108 {
1109         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
1110 }
1111
1112 void MainWindow::toggle_locut(unsigned bus_idx)
1113 {
1114         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
1115 }
1116
1117 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
1118 {
1119         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
1120 }
1121
1122 void MainWindow::toggle_compressor(unsigned bus_idx)
1123 {
1124         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
1125 }
1126
1127 void MainWindow::clear_peak(unsigned bus_idx)
1128 {
1129         post_to_main_thread([=]{
1130                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1131                         global_audio_mixer->reset_peak(bus_idx);
1132                         midi_mapper.set_has_peaked(bus_idx, false);
1133                         midi_mapper.refresh_lights();
1134                 }
1135         });
1136 }
1137
1138 void MainWindow::clear_all_highlights()
1139 {
1140         post_to_main_thread([this]{
1141                 highlight_locut(false);
1142                 highlight_limiter_threshold(false);
1143                 highlight_makeup_gain(false);
1144                 highlight_toggle_limiter(false);
1145                 highlight_toggle_auto_makeup_gain(false);
1146                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
1147                         highlight_treble(bus_idx, false);
1148                         highlight_mid(bus_idx, false);
1149                         highlight_bass(bus_idx, false);
1150                         highlight_gain(bus_idx, false);
1151                         highlight_compressor_threshold(bus_idx, false);
1152                         highlight_fader(bus_idx, false);
1153                         highlight_mute(bus_idx, false);
1154                         highlight_toggle_locut(bus_idx, false);
1155                         highlight_toggle_auto_gain_staging(bus_idx, false);
1156                         highlight_toggle_compressor(bus_idx, false);
1157                 }
1158         });
1159 }
1160
1161 void MainWindow::toggle_limiter()
1162 {
1163         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1164                 ui->limiter_enabled->click();
1165         }
1166 }
1167
1168 void MainWindow::toggle_auto_makeup_gain()
1169 {
1170         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1171                 ui->makeup_gain_auto_checkbox->click();
1172         }
1173 }
1174
1175 void MainWindow::highlight_locut(bool highlight)
1176 {
1177         post_to_main_thread([this, highlight]{
1178                 highlight_control(ui->locut_cutoff_knob, highlight);
1179                 highlight_control(ui->locut_cutoff_knob_2, highlight);
1180         });
1181 }
1182
1183 void MainWindow::highlight_limiter_threshold(bool highlight)
1184 {
1185         post_to_main_thread([this, highlight]{
1186                 highlight_control(ui->limiter_threshold_knob, highlight);
1187                 highlight_control(ui->limiter_threshold_knob_2, highlight);
1188         });
1189 }
1190
1191 void MainWindow::highlight_makeup_gain(bool highlight)
1192 {
1193         post_to_main_thread([this, highlight]{
1194                 highlight_control(ui->makeup_gain_knob, highlight);
1195                 highlight_control(ui->makeup_gain_knob_2, highlight);
1196         });
1197 }
1198
1199 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
1200 {
1201         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
1202 }
1203
1204 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
1205 {
1206         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
1207 }
1208
1209 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
1210 {
1211         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
1212 }
1213
1214 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
1215 {
1216         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
1217 }
1218
1219 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
1220 {
1221         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
1222 }
1223
1224 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1225 {
1226         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1227 }
1228
1229 void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
1230 {
1231         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
1232 }
1233
1234 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1235 {
1236         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1237 }
1238
1239 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1240 {
1241         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1242 }
1243
1244 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1245 {
1246         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1247 }
1248
1249 void MainWindow::highlight_toggle_limiter(bool highlight)
1250 {
1251         post_to_main_thread([this, highlight]{
1252                 highlight_control(ui->limiter_enabled, highlight);
1253                 highlight_control(ui->limiter_enabled_2, highlight);
1254         });
1255 }
1256
1257 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1258 {
1259         post_to_main_thread([this, highlight]{
1260                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1261                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1262         });
1263 }
1264
1265 template<class T>
1266 void MainWindow::set_relative_value(T *control, float value)
1267 {
1268         post_to_main_thread([control, value]{
1269                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1270         });
1271 }
1272
1273 template<class T>
1274 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1275 {
1276         if (global_audio_mixer != nullptr &&
1277             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1278             bus_idx < audio_expanded_views.size()) {
1279                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1280         }
1281 }
1282
1283 template<class T>
1284 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1285 {
1286         post_to_main_thread([this, bus_idx, control]{
1287                 if (global_audio_mixer != nullptr &&
1288                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1289                     bus_idx < audio_expanded_views.size()) {
1290                         (audio_expanded_views[bus_idx]->*control)->click();
1291                 }
1292         });
1293 }
1294
1295 template<class T>
1296 void MainWindow::highlight_control(T *control, bool highlight)
1297 {
1298         if (control == nullptr) {
1299                 return;
1300         }
1301         if (global_audio_mixer == nullptr ||
1302             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1303                 highlight = false;
1304         }
1305         if (highlight) {
1306                 control->setStyleSheet("background: rgb(0,255,0,80)");
1307         } else {
1308                 control->setStyleSheet("");
1309         }
1310 }
1311
1312 template<class T>
1313 void MainWindow::highlight_mute_control(T *control, bool highlight)
1314 {
1315         if (control == nullptr) {
1316                 return;
1317         }
1318         if (global_audio_mixer == nullptr ||
1319             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1320                 highlight = false;
1321         }
1322         if (highlight) {
1323                 control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
1324         } else {
1325                 control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
1326         }
1327 }
1328
1329 template<class T>
1330 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
1331 {
1332         post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
1333                 if (bus_idx < audio_expanded_views.size()) {
1334                         if (is_mute_button) {
1335                                 highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
1336                         } else {
1337                                 highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1338                         }
1339                 }
1340         });
1341 }
1342
1343 void MainWindow::set_transition_names(vector<string> transition_names)
1344 {
1345         if (transition_names.size() < 1 || transition_names[0].empty()) {
1346                 transition_btn1->setText(QString(""));
1347         } else {
1348                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1349                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1350         }
1351         if (transition_names.size() < 2 || transition_names[1].empty()) {
1352                 transition_btn2->setText(QString(""));
1353         } else {
1354                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1355                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1356         }
1357         if (transition_names.size() < 3 || transition_names[2].empty()) {
1358                 transition_btn3->setText(QString(""));
1359         } else {
1360                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1361                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1362         }
1363 }
1364
1365 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1366 {
1367         if (output >= Mixer::OUTPUT_INPUT0) {
1368                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1369                 previews[channel]->label->setText(name.c_str());
1370         }
1371
1372         analyzer->update_channel_name(output, name);
1373 }
1374
1375 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1376 {
1377         if (output >= Mixer::OUTPUT_INPUT0) {
1378                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1379                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1380         }
1381 }
1382
1383 void MainWindow::transition_clicked(int transition_number)
1384 {
1385         global_mixer->transition_clicked(transition_number);
1386 }
1387
1388 void MainWindow::channel_clicked(int channel_number)
1389 {
1390         if (current_wb_pick_display == channel_number) {
1391                 // The picking was already done from eventFilter(), since we don't get
1392                 // the mouse pointer here.
1393         } else {
1394                 global_mixer->channel_clicked(channel_number);
1395         }
1396 }
1397
1398 void MainWindow::quick_cut_activated(int channel_number)
1399 {
1400         if (!global_flags.enable_quick_cut_keys) {
1401                 return;
1402         }
1403         global_mixer->channel_clicked(channel_number);
1404         global_mixer->transition_clicked(0);
1405 }
1406
1407 void MainWindow::wb_button_clicked(int channel_number)
1408 {
1409         current_wb_pick_display = channel_number;
1410         QApplication::setOverrideCursor(Qt::CrossCursor);
1411 }
1412
1413 void MainWindow::audio_view_changed(int audio_view)
1414 {
1415         if (audio_view == current_audio_view) {
1416                 return;
1417         }
1418
1419         if (audio_view == 0) {
1420                 // Compact audio view. (1, full audio view, has no video previews.)
1421                 for (unsigned i = 0; i < previews.size(); ++i) {
1422                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1423                         ui->preview_displays->insertWidget(i, display, 1);
1424                 }
1425         } else if (audio_view == 2) {
1426                 // Video grid display.
1427                 for (unsigned i = 0; i < previews.size(); ++i) {
1428                         QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
1429                         display->setParent(ui->preview_displays_grid);
1430                         display->show();
1431                 }
1432         }
1433
1434         current_audio_view = audio_view;
1435
1436         // Ask for a relayout, but only after the event loop is done doing relayout
1437         // on everything else.
1438         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
1439 }
1440
1441 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1442 {
1443         if (current_wb_pick_display != -1 &&
1444             event->type() == QEvent::MouseButtonRelease &&
1445             watched->isWidgetType()) {
1446                 QApplication::restoreOverrideCursor();
1447                 if (watched == previews[current_wb_pick_display]->display) {
1448                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1449                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1450                 } else {
1451                         // The user clicked on something else, give up.
1452                         // (The click goes through, which might not be ideal, but, yes.)
1453                         current_wb_pick_display = -1;
1454                 }
1455         }
1456         return false;
1457 }
1458
1459 void MainWindow::closeEvent(QCloseEvent *event)
1460 {
1461         if (global_mixer->get_num_connected_clients() > 0) {
1462                 QMessageBox::StandardButton reply =
1463                         QMessageBox::question(this, "Nageru", "There are clients connected. Do you really want to quit?",
1464                                 QMessageBox::Yes | QMessageBox::No);
1465                 if (reply != QMessageBox::Yes) {
1466                         event->ignore();
1467                         return;
1468                 }
1469         }
1470
1471         analyzer->hide();
1472         event->accept();
1473 }
1474
1475 namespace {
1476
1477 double srgb_to_linear(double x)
1478 {
1479         if (x < 0.04045) {
1480                 return x / 12.92;
1481         } else {
1482                 return pow((x + 0.055) / 1.055, 2.4);
1483         }
1484 }
1485
1486 }  // namespace
1487
1488 void MainWindow::set_white_balance(int channel_number, int x, int y)
1489 {
1490         // Set the white balance to neutral for the grab. It's probably going to
1491         // flicker a bit, but hopefully this display is not live anyway.
1492         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1493         previews[channel_number]->display->updateGL();
1494         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1495
1496         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1497         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1498         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1499         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1500         previews[channel_number]->display->updateGL();
1501 }
1502
1503 void MainWindow::audio_state_changed()
1504 {
1505         post_to_main_thread([this]{
1506                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
1507                         return;
1508                 }
1509                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1510                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1511                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1512                         string suffix;
1513                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1514                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1515                                 if (state == ALSAPool::Device::State::STARTING) {
1516                                         suffix = " (busy)";
1517                                 } else if (state == ALSAPool::Device::State::DEAD) {
1518                                         suffix = " (dead)";
1519                                 }
1520                         }
1521
1522                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1523                                 QString::fromStdString(bus.name + suffix));
1524                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1525                                 QString::fromStdString(bus.name + suffix));
1526                 }
1527         });
1528 }