git.sesse.net Git - nageru/blob - mainwindow.cpp

   1 #include "mainwindow.h"
   2
   3 #include <math.h>
   4 #include <stdio.h>
   5 #include <signal.h>
   6 #include <algorithm>
   7 #include <chrono>
   8 #include <string>
   9 #include <vector>
  10 #include <QBoxLayout>
  11 #include <QInputDialog>
  12 #include <QKeySequence>
  13 #include <QLabel>
  14 #include <QMessageBox>
  15 #include <QMetaType>
  16 #include <QPushButton>
  17 #include <QResizeEvent>
  18 #include <QShortcut>
  19 #include <QSize>
  20 #include <QString>
  21
  22 #include "aboutdialog.h"
  23 #include "disk_space_estimator.h"
  24 #include "flags.h"
  25 #include "glwidget.h"
  26 #include "input_mapping_dialog.h"
  27 #include "lrameter.h"
  28 #include "midi_mapping.pb.h"
  29 #include "midi_mapping_dialog.h"
  30 #include "mixer.h"
  31 #include "post_to_main_thread.h"
  32 #include "ui_audio_miniview.h"
  33 #include "ui_audio_expanded_view.h"
  34 #include "ui_display.h"
  35 #include "ui_mainwindow.h"
  36 #include "vumeter.h"
  37
  38 class QResizeEvent;
  39
  40 using namespace std;
  41 using namespace std::chrono;
  42 using namespace std::placeholders;
  43
  44 Q_DECLARE_METATYPE(std::string);
  45 Q_DECLARE_METATYPE(std::vector<std::string>);
  46
  47 MainWindow *global_mainwindow = nullptr;
  48
  49 namespace {
  50
  51 void schedule_cut_signal(int ignored)
  52 {
  53         global_mixer->schedule_cut();
  54 }
  55
  56 void quit_signal(int ignored)
  57 {
  58         global_mainwindow->close();
  59 }
  60
  61 void slave_knob(QDial *master, QDial *slave)
  62 {
  63         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  64                 slave->blockSignals(true);
  65                 slave->setValue(value);
  66                 slave->blockSignals(false);
  67         });
  68         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
  69                 master->setValue(value);
  70         });
  71 }
  72
  73 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
  74 {
  75         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
  76                 slave->blockSignals(true);
  77                 slave->setCheckState(Qt::CheckState(state));
  78                 slave->blockSignals(false);
  79         });
  80         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
  81                 master->setCheckState(Qt::CheckState(state));
  82         });
  83 }
  84
  85 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
  86 {
  87         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
  88                 slave->blockSignals(true);
  89                 slave->setDbValue(value);
  90                 slave->blockSignals(false);
  91         });
  92         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
  93                 master->setDbValue(value);
  94         });
  95 }
  96
  97 constexpr unsigned DB_NO_FLAGS = 0x0;
  98 constexpr unsigned DB_WITH_SIGN = 0x1;
  99 constexpr unsigned DB_BARE = 0x2;
 100
 101 string format_db(double db, unsigned flags)
 102 {
 103         string text;
 104         if (flags & DB_WITH_SIGN) {
 105                 if (isfinite(db)) {
 106                         char buf[256];
 107                         snprintf(buf, sizeof(buf), "%+.1f", db);
 108                         text = buf;
 109                 } else if (db < 0.0) {
 110                         text = "-∞";
 111                 } else {
 112                         // Should never happen, really.
 113                         text = "+∞";
 114                 }
 115         } else {
 116                 if (isfinite(db)) {
 117                         char buf[256];
 118                         snprintf(buf, sizeof(buf), "%.1f", db);
 119                         text = buf;
 120                 } else if (db < 0.0) {
 121                         text = "-∞";
 122                 } else {
 123                         // Should never happen, really.
 124                         text = "∞";
 125                 }
 126         }
 127         if (!(flags & DB_BARE)) {
 128                 text += " dB";
 129         }
 130         return text;
 131 }
 132
 133 void set_peak_label(QLabel *peak_label, float peak_db)
 134 {
 135         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 136
 137         // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
 138         // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
 139         if (peak_db > -0.1f) {
 140                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 141         } else {
 142                 peak_label->setStyleSheet("");
 143         }
 144 }
 145
 146 }  // namespace
 147
 148 MainWindow::MainWindow()
 149         : ui(new Ui::MainWindow), midi_mapper(this)
 150 {
 151         global_mainwindow = this;
 152         ui->setupUi(this);
 153
 154         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 155         disk_free_label = new QLabel(this);
 156         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 157         ui->menuBar->setCornerWidget(disk_free_label);
 158
 159         QActionGroup *audio_mapping_group = new QActionGroup(this);
 160         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 161         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 162
 163         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 164         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 165
 166         // The menus.
 167         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 168         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 169         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 170         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 171         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 172         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 173         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 174
 175         if (global_flags.x264_video_to_http) {
 176                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 177         } else {
 178                 ui->x264_bitrate_action->setEnabled(false);
 179         }
 180
 181         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 182         // TODO: Make them dynamic.
 183         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 184         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 185         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 186
 187         // Aiee...
 188         transition_btn1 = ui->transition_btn1;
 189         transition_btn2 = ui->transition_btn2;
 190         transition_btn3 = ui->transition_btn3;
 191         qRegisterMetaType<string>("std::string");
 192         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 193         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 194         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 195
 196         // Hook up the prev/next buttons on the audio views.
 197         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 198         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 199         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 200         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 201
 202         // And bind the same to PgUp/PgDown.
 203         auto switch_page = [this]{
 204                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 205                         ui->audio_views->setCurrentIndex(1 - ui->audio_views->currentIndex());
 206                 }
 207         };
 208         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, switch_page);
 209         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, switch_page);
 210
 211         last_audio_level_callback = steady_clock::now() - seconds(1);
 212
 213         if (!global_flags.midi_mapping_filename.empty()) {
 214                 MIDIMappingProto midi_mapping;
 215                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 216                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 217                                 global_flags.midi_mapping_filename.c_str());
 218                         exit(1);
 219                 }
 220                 midi_mapper.set_midi_mapping(midi_mapping);
 221         }
 222         midi_mapper.start_thread();
 223 }
 224
 225 void MainWindow::resizeEvent(QResizeEvent* event)
 226 {
 227         QMainWindow::resizeEvent(event);
 228
 229         // Ask for a relayout, but only after the event loop is done doing relayout
 230         // on everything else.
 231         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 232 }
 233
 234 void MainWindow::mixer_created(Mixer *mixer)
 235 {
 236         // Make the previews.
 237         unsigned num_previews = mixer->get_num_channels();
 238
 239         for (unsigned i = 0; i < num_previews; ++i) {
 240                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 241
 242                 QWidget *preview = new QWidget(this);
 243                 Ui::Display *ui_display = new Ui::Display;
 244                 ui_display->setupUi(preview);
 245                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 246                 ui_display->display->set_output(output);
 247                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 248                 previews.push_back(ui_display);
 249
 250                 // Hook up the click.
 251                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 252
 253                 // Let the theme update the text whenever the resolution or color changed.
 254                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 255                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 256
 257                 // Hook up the keyboard key.
 258                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 259                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 260
 261                 // Hook up the white balance button (irrelevant if invisible).
 262                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 263                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 264         }
 265
 266         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 267
 268         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 269         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 270         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 271         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 272         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 273
 274         reset_audio_mapping_ui();
 275
 276         // TODO: Fetch all of the values these for completeness,
 277         // not just the enable knobs implied by flags.
 278         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 279         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 280
 281         // Controls used only for simple audio fetch their state from the first bus.
 282         constexpr unsigned simple_bus_index = 0;
 283         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 284                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 285                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 286                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 287                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 288                 ui->compressor_threshold_db_display->setText(
 289                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 290         }
 291         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 292                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 293         });
 294         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 295                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 296         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 297                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 298         });
 299         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 300                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 301         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 302                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 303         });
 304
 305         // Global mastering controls.
 306         QString limiter_threshold_label(
 307                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 308         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 309         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 310
 311         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 312         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 313
 314         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 315         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 316                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 317         });
 318
 319         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 320         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 321                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 322         });
 323         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 324         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 325
 326         midi_mapper.refresh_highlights();
 327
 328         struct sigaction act;
 329         memset(&act, 0, sizeof(act));
 330         act.sa_handler = schedule_cut_signal;
 331         act.sa_flags = SA_RESTART;
 332         sigaction(SIGHUP, &act, nullptr);
 333
 334         // Mostly for debugging. Don't override SIGINT, that's so evil if
 335         // shutdown isn't instant.
 336         memset(&act, 0, sizeof(act));
 337         act.sa_handler = quit_signal;
 338         act.sa_flags = SA_RESTART;
 339         sigaction(SIGUSR1, &act, nullptr);
 340 }
 341
 342 void MainWindow::reset_audio_mapping_ui()
 343 {
 344         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 345
 346         ui->simple_audio_mode->setChecked(simple);
 347         ui->multichannel_audio_mode->setChecked(!simple);
 348         ui->input_mapping_action->setEnabled(!simple);
 349         ui->midi_mapping_action->setEnabled(!simple);
 350
 351         ui->locut_enabled->setVisible(simple);
 352         ui->gainstaging_label->setVisible(simple);
 353         ui->gainstaging_knob->setVisible(simple);
 354         ui->gainstaging_db_display->setVisible(simple);
 355         ui->gainstaging_auto_checkbox->setVisible(simple);
 356         ui->compressor_threshold_label->setVisible(simple);
 357         ui->compressor_threshold_knob->setVisible(simple);
 358         ui->compressor_threshold_db_display->setVisible(simple);
 359         ui->compressor_enabled->setVisible(simple);
 360
 361         setup_audio_miniview();
 362         setup_audio_expanded_view();
 363
 364         if (simple) {
 365                 ui->audio_views->setCurrentIndex(0);
 366         }
 367         ui->compact_header->setVisible(!simple);
 368
 369         midi_mapper.refresh_highlights();
 370 }
 371
 372 void MainWindow::setup_audio_miniview()
 373 {
 374         // Remove any existing channels.
 375         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 376                 delete item->widget();
 377                 delete item;
 378         }
 379         audio_miniviews.clear();
 380
 381         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 382                 return;
 383         }
 384
 385         // Set up brand new ones from the input mapping.
 386         InputMapping mapping = global_audio_mixer->get_input_mapping();
 387         audio_miniviews.resize(mapping.buses.size());
 388         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 389                 QWidget *channel = new QWidget(this);
 390                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 391                 ui_audio_miniview->setupUi(channel);
 392                 ui_audio_miniview->bus_desc_label->setFullText(
 393                         QString::fromStdString(mapping.buses[bus_index].name));
 394                 audio_miniviews[bus_index] = ui_audio_miniview;
 395
 396                 // Set up the peak meter.
 397                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 398                 peak_meter->set_min_level(-30.0f);
 399                 peak_meter->set_max_level(0.0f);
 400                 peak_meter->set_ref_level(0.0f);
 401
 402                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 403
 404                 ui->faders->addWidget(channel);
 405
 406                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 407                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 408                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 409                         [bus_index]() {
 410                                 global_audio_mixer->reset_peak(bus_index);
 411                         });
 412         }
 413 }
 414
 415 void MainWindow::setup_audio_expanded_view()
 416 {
 417         // Remove any existing channels.
 418         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 419                 delete item->widget();
 420                 delete item;
 421         }
 422         audio_expanded_views.clear();
 423
 424         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 425                 return;
 426         }
 427
 428         // Set up brand new ones from the input mapping.
 429         InputMapping mapping = global_audio_mixer->get_input_mapping();
 430         audio_expanded_views.resize(mapping.buses.size());
 431         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 432                 QWidget *channel = new QWidget(this);
 433                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 434                 ui_audio_expanded_view->setupUi(channel);
 435                 ui_audio_expanded_view->bus_desc_label->setFullText(
 436                         QString::fromStdString(mapping.buses[bus_index].name));
 437                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 438                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 439                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 440                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 441                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 442                 ui->buses->addWidget(channel);
 443
 444                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 445                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 446                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 447                 });
 448
 449                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 450                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 451                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 452                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 453                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 454                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 455
 456                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 457                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 458                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 459
 460                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 461                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 462                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 463                 });
 464
 465                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 466                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 467                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 468                 });
 469
 470                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 471
 472                 // Set up the peak meter.
 473                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 474                 peak_meter->set_min_level(-30.0f);
 475                 peak_meter->set_max_level(0.0f);
 476                 peak_meter->set_ref_level(0.0f);
 477
 478                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 479                         [bus_index]() {
 480                                 global_audio_mixer->reset_peak(bus_index);
 481                         });
 482
 483                 // Set up the compression attenuation meter.
 484                 VUMeter *reduction_meter = ui_audio_expanded_view->reduction_meter;
 485                 reduction_meter->set_min_level(0.0f);
 486                 reduction_meter->set_max_level(10.0f);
 487                 reduction_meter->set_ref_level(0.0f);
 488                 reduction_meter->set_flip(true);
 489         }
 490
 491         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 492 }
 493
 494 void MainWindow::mixer_shutting_down()
 495 {
 496         ui->me_live->clean_context();
 497         ui->me_preview->clean_context();
 498         for (Ui::Display *display : previews) {
 499                 display->display->clean_context();
 500         }
 501 }
 502
 503 void MainWindow::cut_triggered()
 504 {
 505         global_mixer->schedule_cut();
 506 }
 507
 508 void MainWindow::x264_bitrate_triggered()
 509 {
 510         bool ok;
 511         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);
 512         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 513                 global_flags.x264_bitrate = new_bitrate;
 514                 global_mixer->change_x264_bitrate(new_bitrate);
 515         }
 516 }
 517
 518 void MainWindow::exit_triggered()
 519 {
 520         close();
 521 }
 522
 523 void MainWindow::about_triggered()
 524 {
 525         AboutDialog().exec();
 526 }
 527
 528 void MainWindow::simple_audio_mode_triggered()
 529 {
 530         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 531                 return;
 532         }
 533         unsigned card_index = global_audio_mixer->get_simple_input();
 534         if (card_index == numeric_limits<unsigned>::max()) {
 535                 QMessageBox::StandardButton reply =
 536                         QMessageBox::question(this,
 537                                 "Mapping too complex",
 538                                 "The current audio mapping is too complicated to be representable in simple mode, "
 539                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 540                                 QMessageBox::Yes | QMessageBox::No);
 541                 if (reply == QMessageBox::No) {
 542                         ui->simple_audio_mode->setChecked(false);
 543                         ui->multichannel_audio_mode->setChecked(true);
 544                         return;
 545                 }
 546                 card_index = 0;
 547         }
 548         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 549         reset_audio_mapping_ui();
 550 }
 551
 552 void MainWindow::multichannel_audio_mode_triggered()
 553 {
 554         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 555                 return;
 556         }
 557
 558         // Take the generated input mapping from the simple input,
 559         // and set it as a normal multichannel mapping, which causes
 560         // the mode to go to multichannel.
 561         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 562         reset_audio_mapping_ui();
 563 }
 564
 565 void MainWindow::input_mapping_triggered()
 566 {
 567         if (InputMappingDialog().exec() == QDialog::Accepted) {
 568                 setup_audio_miniview();
 569                 setup_audio_expanded_view();
 570         }
 571         midi_mapper.refresh_highlights();
 572 }
 573
 574 void MainWindow::midi_mapping_triggered()
 575 {
 576         MIDIMappingDialog(&midi_mapper).exec();
 577 }
 578
 579 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 580 {
 581         if (bus_index == 0) {
 582                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 583         }
 584         if (bus_index < audio_expanded_views.size()) {
 585                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 586         }
 587
 588         float gain_db = value * 0.1f;
 589         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 590
 591         // The label will be updated by the audio level callback.
 592 }
 593
 594 void MainWindow::final_makeup_gain_knob_changed(int value)
 595 {
 596         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 597
 598         float gain_db = value * 0.1f;
 599         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 600
 601         // The label will be updated by the audio level callback.
 602 }
 603
 604 void MainWindow::cutoff_knob_changed(int value)
 605 {
 606         float octaves = value * 0.1f;
 607         float cutoff_hz = 20.0 * pow(2.0, octaves);
 608         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 609         update_cutoff_labels(cutoff_hz);
 610 }
 611
 612 void MainWindow::update_cutoff_labels(float cutoff_hz)
 613 {
 614         char buf[256];
 615         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 616         ui->locut_cutoff_display->setText(buf);
 617         ui->locut_cutoff_display_2->setText(buf);
 618
 619         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 620                 audio_expanded_views[bus_index]->locut_enabled->setText(
 621                         QString("Lo-cut: ") + buf);
 622         }
 623 }
 624
 625 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 626 {
 627         char time_str[256];
 628         if (estimated_seconds_left < 60.0) {
 629                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 630         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 631                 int s = lrintf(estimated_seconds_left);
 632                 int m = s / 60;
 633                 s %= 60;
 634                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 635         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 636                 int m = lrintf(estimated_seconds_left / 60.0);
 637                 snprintf(time_str, sizeof(time_str), "%dm", m);
 638         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 639                 int m = lrintf(estimated_seconds_left / 60.0);
 640                 int h = m / 60;
 641                 m %= 60;
 642                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 643         } else {  // More than ten hours: Xh.
 644                 int h = lrintf(estimated_seconds_left / 3600.0);
 645                 snprintf(time_str, sizeof(time_str), "%dh", h);
 646         }
 647         char buf[256];
 648         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 649
 650         std::string label = buf;
 651
 652         post_to_main_thread([this, label]{
 653                 disk_free_label->setText(QString::fromStdString(label));
 654                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 655         });
 656 }
 657
 658 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 659 {
 660         float gain_db = value * 0.1f;
 661         global_audio_mixer->set_eq(bus_index, band, gain_db);
 662
 663         update_eq_label(bus_index, band, gain_db);
 664 }
 665
 666 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 667 {
 668         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 669         string db_string = format_db(gain_db, DB_WITH_SIGN);
 670         switch (band) {
 671         case EQ_BAND_TREBLE:
 672                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 673                 break;
 674         case EQ_BAND_MID:
 675                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 676                 break;
 677         case EQ_BAND_BASS:
 678                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 679                 break;
 680         default:
 681                 assert(false);
 682         }
 683 }
 684
 685 void MainWindow::limiter_threshold_knob_changed(int value)
 686 {
 687         float threshold_dbfs = value * 0.1f;
 688         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 689         ui->limiter_threshold_db_display->setText(
 690                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 691         ui->limiter_threshold_db_display_2->setText(
 692                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 693 }
 694
 695 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 696 {
 697         float threshold_dbfs = value * 0.1f;
 698         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 699
 700         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 701         if (bus_index == 0) {
 702                 ui->compressor_threshold_db_display->setText(label);
 703         }
 704         if (bus_index < audio_expanded_views.size()) {
 705                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 706         }
 707 }
 708
 709 void MainWindow::mini_fader_changed(int bus, double volume_db)
 710 {
 711         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 712         audio_miniviews[bus]->fader_label->setText(label);
 713         audio_expanded_views[bus]->fader_label->setText(label);
 714
 715         global_audio_mixer->set_fader_volume(bus, volume_db);
 716 }
 717
 718 void MainWindow::reset_meters_button_clicked()
 719 {
 720         global_audio_mixer->reset_meters();
 721         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 722         ui->peak_display->setStyleSheet("");
 723 }
 724
 725 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 726                                       float global_level_lufs,
 727                                       float range_low_lufs, float range_high_lufs,
 728                                       float final_makeup_gain_db,
 729                                       float correlation)
 730 {
 731         steady_clock::time_point now = steady_clock::now();
 732
 733         // The meters are somewhat inefficient to update. Only update them
 734         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 735         // means that the digital peak meters are ever so slightly too low
 736         // (each update won't be a faithful representation of the highest peak
 737         // since the previous update, since there are frames we won't draw),
 738         // but the _peak_ of the peak meters will be correct (it's tracked in
 739         // AudioMixer, not here), and that's much more important.
 740         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 741         if (last_update_age < 0.100) {
 742                 return;
 743         }
 744         last_audio_level_callback = now;
 745
 746         post_to_main_thread([=]() {
 747                 ui->vu_meter->set_level(level_lufs);
 748                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 749                         if (bus_index < audio_miniviews.size()) {
 750                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 751                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 752                                 miniview->peak_meter->set_level(
 753                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 754                                 miniview->peak_meter->set_peak(
 755                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 756                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 757
 758                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 759                                 view->peak_meter->set_level(
 760                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 761                                 view->peak_meter->set_peak(
 762                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 763                                 view->reduction_meter->set_level(level.compressor_attenuation_db);
 764                                 view->gainstaging_knob->blockSignals(true);
 765                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 766                                 view->gainstaging_knob->blockSignals(false);
 767                                 view->gainstaging_db_display->setText(
 768                                         QString("Gain: ") +
 769                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 770                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 771                         }
 772                 }
 773                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 774                 ui->correlation_meter->set_correlation(correlation);
 775
 776                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 777                 set_peak_label(ui->peak_display, peak_db);
 778
 779                 // NOTE: Will be invisible when using multitrack audio.
 780                 ui->gainstaging_knob->blockSignals(true);
 781                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 782                 ui->gainstaging_knob->blockSignals(false);
 783                 ui->gainstaging_db_display->setText(
 784                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 785
 786                 ui->makeup_gain_knob->blockSignals(true);
 787                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 788                 ui->makeup_gain_knob->blockSignals(false);
 789                 ui->makeup_gain_db_display->setText(
 790                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 791                 ui->makeup_gain_db_display_2->setText(
 792                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 793         });
 794 }
 795
 796 void MainWindow::relayout()
 797 {
 798         int height = ui->vertical_layout->geometry().height();
 799
 800         double remaining_height = height;
 801
 802         // Allocate the height; the most important part is to keep the main displays
 803         // at 16:9 if at all possible.
 804         double me_width = ui->me_preview->width();
 805         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 806
 807         // TODO: Scale the widths when we need to do this.
 808         if (me_height / double(height) > 0.8) {
 809                 me_height = height * 0.8;
 810         }
 811         remaining_height -= me_height + ui->vertical_layout->spacing();
 812
 813         // Space between the M/E displays and the audio strip.
 814         remaining_height -= ui->vertical_layout->spacing();
 815
 816         // The label above the audio strip.
 817         double compact_label_height = ui->compact_label->minimumHeight() +
 818                 ui->compact_audio_layout->spacing();
 819         remaining_height -= compact_label_height;
 820
 821         // The previews will be constrained by the remaining height, and the width.
 822         double preview_label_height = previews[0]->title_bar->geometry().height() +
 823                 previews[0]->main_vertical_layout->spacing();
 824         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 825         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 826         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 827
 828         ui->vertical_layout->setStretch(0, lrintf(me_height));
 829         ui->vertical_layout->setStretch(1,
 830                 lrintf(compact_label_height) +
 831                 lrintf(remaining_height) +
 832                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 833
 834         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 835         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 836         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 837
 838         // Set the widths for the previews.
 839         double preview_width = preview_height * 16.0 / 9.0;
 840         for (unsigned i = 0; i < previews.size(); ++i) {
 841                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 842         }
 843
 844         // The preview horizontal spacer.
 845         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 846         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 847 }
 848
 849 void MainWindow::set_locut(float value)
 850 {
 851         set_relative_value(ui->locut_cutoff_knob, value);
 852 }
 853
 854 void MainWindow::set_limiter_threshold(float value)
 855 {
 856         set_relative_value(ui->limiter_threshold_knob, value);
 857 }
 858
 859 void MainWindow::set_makeup_gain(float value)
 860 {
 861         set_relative_value(ui->makeup_gain_knob, value);
 862 }
 863
 864 void MainWindow::set_treble(unsigned bus_idx, float value)
 865 {
 866         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
 867 }
 868
 869 void MainWindow::set_mid(unsigned bus_idx, float value)
 870 {
 871         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
 872 }
 873
 874 void MainWindow::set_bass(unsigned bus_idx, float value)
 875 {
 876         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
 877 }
 878
 879 void MainWindow::set_gain(unsigned bus_idx, float value)
 880 {
 881         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
 882 }
 883
 884 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
 885 {
 886         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
 887 }
 888
 889 void MainWindow::set_fader(unsigned bus_idx, float value)
 890 {
 891         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
 892 }
 893
 894 void MainWindow::toggle_locut(unsigned bus_idx)
 895 {
 896         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
 897 }
 898
 899 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
 900 {
 901         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
 902 }
 903
 904 void MainWindow::toggle_compressor(unsigned bus_idx)
 905 {
 906         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
 907 }
 908
 909 void MainWindow::clear_peak(unsigned bus_idx)
 910 {
 911         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 912                 global_audio_mixer->reset_peak(bus_idx);
 913         }
 914 }
 915
 916 void MainWindow::clear_all_highlights()
 917 {
 918         post_to_main_thread([this]{
 919                 highlight_locut(false);
 920                 highlight_limiter_threshold(false);
 921                 highlight_makeup_gain(false);
 922                 highlight_toggle_limiter(false);
 923                 highlight_toggle_auto_makeup_gain(false);
 924                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
 925                         highlight_treble(bus_idx, false);
 926                         highlight_mid(bus_idx, false);
 927                         highlight_bass(bus_idx, false);
 928                         highlight_gain(bus_idx, false);
 929                         highlight_compressor_threshold(bus_idx, false);
 930                         highlight_fader(bus_idx, false);
 931                         highlight_toggle_locut(bus_idx, false);
 932                         highlight_toggle_auto_gain_staging(bus_idx, false);
 933                         highlight_toggle_compressor(bus_idx, false);
 934                 }
 935         });
 936 }
 937
 938 void MainWindow::toggle_limiter()
 939 {
 940         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 941                 ui->limiter_enabled->click();
 942         }
 943 }
 944
 945 void MainWindow::toggle_auto_makeup_gain()
 946 {
 947         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 948                 ui->makeup_gain_auto_checkbox->click();
 949         }
 950 }
 951
 952 void MainWindow::highlight_locut(bool highlight)
 953 {
 954         post_to_main_thread([this, highlight]{
 955                 highlight_control(ui->locut_cutoff_knob, highlight);
 956                 highlight_control(ui->locut_cutoff_knob_2, highlight);
 957         });
 958 }
 959
 960 void MainWindow::highlight_limiter_threshold(bool highlight)
 961 {
 962         post_to_main_thread([this, highlight]{
 963                 highlight_control(ui->limiter_threshold_knob, highlight);
 964                 highlight_control(ui->limiter_threshold_knob_2, highlight);
 965         });
 966 }
 967
 968 void MainWindow::highlight_makeup_gain(bool highlight)
 969 {
 970         post_to_main_thread([this, highlight]{
 971                 highlight_control(ui->makeup_gain_knob, highlight);
 972                 highlight_control(ui->makeup_gain_knob_2, highlight);
 973         });
 974 }
 975
 976 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
 977 {
 978         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
 979 }
 980
 981 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
 982 {
 983         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
 984 }
 985
 986 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
 987 {
 988         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
 989 }
 990
 991 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
 992 {
 993         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
 994 }
 995
 996 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
 997 {
 998         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
 999 }
1000
1001 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1002 {
1003         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1004 }
1005
1006 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1007 {
1008         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1009 }
1010
1011 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1012 {
1013         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1014 }
1015
1016 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1017 {
1018         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1019 }
1020
1021 void MainWindow::highlight_toggle_limiter(bool highlight)
1022 {
1023         post_to_main_thread([this, highlight]{
1024                 highlight_control(ui->limiter_enabled, highlight);
1025                 highlight_control(ui->limiter_enabled_2, highlight);
1026         });
1027 }
1028
1029 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1030 {
1031         post_to_main_thread([this, highlight]{
1032                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1033                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1034         });
1035 }
1036
1037 template<class T>
1038 void MainWindow::set_relative_value(T *control, float value)
1039 {
1040         post_to_main_thread([control, value]{
1041                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1042         });
1043 }
1044
1045 template<class T>
1046 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1047 {
1048         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1049             bus_idx < audio_expanded_views.size()) {
1050                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1051         }
1052 }
1053
1054 template<class T>
1055 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1056 {
1057         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1058             bus_idx < audio_expanded_views.size()) {
1059                 (audio_expanded_views[bus_idx]->*control)->click();
1060         }
1061 }
1062
1063 template<class T>
1064 void MainWindow::highlight_control(T *control, bool highlight)
1065 {
1066         if (control == nullptr) {
1067                 return;
1068         }
1069         if (global_audio_mixer == nullptr ||
1070             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1071                 highlight = false;
1072         }
1073         if (highlight) {
1074                 control->setStyleSheet("background: rgb(0,255,0,80)");
1075         } else {
1076                 control->setStyleSheet("");
1077         }
1078 }
1079
1080 template<class T>
1081 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight)
1082 {
1083         post_to_main_thread([this, bus_idx, control, highlight]{
1084                 if (bus_idx < audio_expanded_views.size()) {
1085                         highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1086                 }
1087         });
1088 }
1089
1090 void MainWindow::set_transition_names(vector<string> transition_names)
1091 {
1092         if (transition_names.size() < 1 || transition_names[0].empty()) {
1093                 transition_btn1->setText(QString(""));
1094         } else {
1095                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1096                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1097         }
1098         if (transition_names.size() < 2 || transition_names[1].empty()) {
1099                 transition_btn2->setText(QString(""));
1100         } else {
1101                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1102                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1103         }
1104         if (transition_names.size() < 3 || transition_names[2].empty()) {
1105                 transition_btn3->setText(QString(""));
1106         } else {
1107                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1108                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1109         }
1110 }
1111
1112 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1113 {
1114         if (output >= Mixer::OUTPUT_INPUT0) {
1115                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1116                 previews[channel]->label->setText(name.c_str());
1117         }
1118 }
1119
1120 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1121 {
1122         if (output >= Mixer::OUTPUT_INPUT0) {
1123                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1124                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1125         }
1126 }
1127
1128 void MainWindow::transition_clicked(int transition_number)
1129 {
1130         global_mixer->transition_clicked(transition_number);
1131 }
1132
1133 void MainWindow::channel_clicked(int channel_number)
1134 {
1135         if (current_wb_pick_display == channel_number) {
1136                 // The picking was already done from eventFilter(), since we don't get
1137                 // the mouse pointer here.
1138         } else {
1139                 global_mixer->channel_clicked(channel_number);
1140         }
1141 }
1142
1143 void MainWindow::wb_button_clicked(int channel_number)
1144 {
1145         current_wb_pick_display = channel_number;
1146         QApplication::setOverrideCursor(Qt::CrossCursor);
1147 }
1148
1149 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1150 {
1151         if (current_wb_pick_display != -1 &&
1152             event->type() == QEvent::MouseButtonRelease &&
1153             watched->isWidgetType()) {
1154                 QApplication::restoreOverrideCursor();
1155                 if (watched == previews[current_wb_pick_display]->display) {
1156                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1157                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1158                 } else {
1159                         // The user clicked on something else, give up.
1160                         // (The click goes through, which might not be ideal, but, yes.)
1161                         current_wb_pick_display = -1;
1162                 }
1163         }
1164         return false;
1165 }
1166
1167 namespace {
1168
1169 double srgb_to_linear(double x)
1170 {
1171         if (x < 0.04045) {
1172                 return x / 12.92;
1173         } else {
1174                 return pow((x + 0.055) / 1.055, 2.4);
1175         }
1176 }
1177
1178 }  // namespace
1179
1180 void MainWindow::set_white_balance(int channel_number, int x, int y)
1181 {
1182         // Set the white balance to neutral for the grab. It's probably going to
1183         // flicker a bit, but hopefully this display is not live anyway.
1184         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1185         previews[channel_number]->display->updateGL();
1186         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1187
1188         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1189         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1190         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1191         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1192         previews[channel_number]->display->updateGL();
1193 }
1194
1195 void MainWindow::audio_state_changed()
1196 {
1197         post_to_main_thread([this]{
1198                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1199                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1200                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1201                         string suffix;
1202                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1203                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1204                                 if (state == ALSAPool::Device::State::STARTING) {
1205                                         suffix = " (busy)";
1206                                 } else if (state == ALSAPool::Device::State::DEAD) {
1207                                         suffix = " (dead)";
1208                                 }
1209                         }
1210
1211                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1212                                 QString::fromStdString(bus.name + suffix));
1213                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1214                                 QString::fromStdString(bus.name + suffix));
1215                 }
1216         });
1217 }