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