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 // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
  50 // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
  51 constexpr float peak_limit_dbfs = -0.1f;
  52
  53 namespace {
  54
  55 void schedule_cut_signal(int ignored)
  56 {
  57         global_mixer->schedule_cut();
  58 }
  59
  60 void quit_signal(int ignored)
  61 {
  62         global_mainwindow->close();
  63 }
  64
  65 void slave_knob(QDial *master, QDial *slave)
  66 {
  67         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  68                 slave->blockSignals(true);
  69                 slave->setValue(value);
  70                 slave->blockSignals(false);
  71         });
  72         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
  73                 master->setValue(value);
  74         });
  75 }
  76
  77 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
  78 {
  79         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
  80                 slave->blockSignals(true);
  81                 slave->setCheckState(Qt::CheckState(state));
  82                 slave->blockSignals(false);
  83         });
  84         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
  85                 master->setCheckState(Qt::CheckState(state));
  86         });
  87 }
  88
  89 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
  90 {
  91         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
  92                 slave->blockSignals(true);
  93                 slave->setDbValue(value);
  94                 slave->blockSignals(false);
  95         });
  96         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
  97                 master->setDbValue(value);
  98         });
  99 }
 100
 101 constexpr unsigned DB_NO_FLAGS = 0x0;
 102 constexpr unsigned DB_WITH_SIGN = 0x1;
 103 constexpr unsigned DB_BARE = 0x2;
 104
 105 string format_db(double db, unsigned flags)
 106 {
 107         string text;
 108         if (flags & DB_WITH_SIGN) {
 109                 if (isfinite(db)) {
 110                         char buf[256];
 111                         snprintf(buf, sizeof(buf), "%+.1f", db);
 112                         text = buf;
 113                 } else if (db < 0.0) {
 114                         text = "-∞";
 115                 } else {
 116                         // Should never happen, really.
 117                         text = "+∞";
 118                 }
 119         } else {
 120                 if (isfinite(db)) {
 121                         char buf[256];
 122                         snprintf(buf, sizeof(buf), "%.1f", db);
 123                         text = buf;
 124                 } else if (db < 0.0) {
 125                         text = "-∞";
 126                 } else {
 127                         // Should never happen, really.
 128                         text = "∞";
 129                 }
 130         }
 131         if (!(flags & DB_BARE)) {
 132                 text += " dB";
 133         }
 134         return text;
 135 }
 136
 137 void set_peak_label(QLabel *peak_label, float peak_db)
 138 {
 139         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 140
 141         if (peak_db > peak_limit_dbfs) {
 142                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 143         } else {
 144                 peak_label->setStyleSheet("");
 145         }
 146 }
 147
 148 }  // namespace
 149
 150 MainWindow::MainWindow()
 151         : ui(new Ui::MainWindow), midi_mapper(this)
 152 {
 153         global_mainwindow = this;
 154         ui->setupUi(this);
 155
 156         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 157         disk_free_label = new QLabel(this);
 158         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 159         ui->menuBar->setCornerWidget(disk_free_label);
 160
 161         QActionGroup *audio_mapping_group = new QActionGroup(this);
 162         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 163         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 164
 165         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 166         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 167
 168         // The menus.
 169         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 170         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 171         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 172         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 173         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 174         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 175         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 176
 177         if (global_flags.x264_video_to_http) {
 178                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 179         } else {
 180                 ui->x264_bitrate_action->setEnabled(false);
 181         }
 182
 183         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 184         // TODO: Make them dynamic.
 185         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 186         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 187         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 188
 189         // Aiee...
 190         transition_btn1 = ui->transition_btn1;
 191         transition_btn2 = ui->transition_btn2;
 192         transition_btn3 = ui->transition_btn3;
 193         qRegisterMetaType<string>("std::string");
 194         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 195         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 196         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 197
 198         // Hook up the prev/next buttons on the audio views.
 199         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 200         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 201         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 202         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 203
 204         // And bind the same to PgUp/PgDown.
 205         auto switch_page = [this]{
 206                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 207                         ui->audio_views->setCurrentIndex(1 - ui->audio_views->currentIndex());
 208                 }
 209         };
 210         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, switch_page);
 211         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, switch_page);
 212
 213         last_audio_level_callback = steady_clock::now() - seconds(1);
 214
 215         if (!global_flags.midi_mapping_filename.empty()) {
 216                 MIDIMappingProto midi_mapping;
 217                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 218                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 219                                 global_flags.midi_mapping_filename.c_str());
 220                         exit(1);
 221                 }
 222                 midi_mapper.set_midi_mapping(midi_mapping);
 223         }
 224         midi_mapper.start_thread();
 225 }
 226
 227 void MainWindow::resizeEvent(QResizeEvent* event)
 228 {
 229         QMainWindow::resizeEvent(event);
 230
 231         // Ask for a relayout, but only after the event loop is done doing relayout
 232         // on everything else.
 233         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 234 }
 235
 236 void MainWindow::mixer_created(Mixer *mixer)
 237 {
 238         // Make the previews.
 239         unsigned num_previews = mixer->get_num_channels();
 240
 241         for (unsigned i = 0; i < num_previews; ++i) {
 242                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 243
 244                 QWidget *preview = new QWidget(this);
 245                 Ui::Display *ui_display = new Ui::Display;
 246                 ui_display->setupUi(preview);
 247                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 248                 ui_display->display->set_output(output);
 249                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 250                 previews.push_back(ui_display);
 251
 252                 // Hook up the click.
 253                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 254
 255                 // Let the theme update the text whenever the resolution or color changed.
 256                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 257                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 258
 259                 // Hook up the keyboard key.
 260                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 261                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 262
 263                 // Hook up the white balance button (irrelevant if invisible).
 264                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 265                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 266         }
 267
 268         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 269
 270         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 271         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 272         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 273         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 274         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 275
 276         reset_audio_mapping_ui();
 277
 278         // TODO: Fetch all of the values these for completeness,
 279         // not just the enable knobs implied by flags.
 280         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 281         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 282
 283         // Controls used only for simple audio fetch their state from the first bus.
 284         constexpr unsigned simple_bus_index = 0;
 285         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 286                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 287                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 288                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 289                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 290                 ui->compressor_threshold_db_display->setText(
 291                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 292         }
 293         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 294                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 295                 midi_mapper.refresh_lights();
 296         });
 297         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 298                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 299         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 300                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 301                 midi_mapper.refresh_lights();
 302         });
 303         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 304                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 305         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 306                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 307                 midi_mapper.refresh_lights();
 308         });
 309
 310         // Global mastering controls.
 311         QString limiter_threshold_label(
 312                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 313         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 314         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 315
 316         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 317         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 318
 319         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 320         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 321                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 322                 midi_mapper.refresh_lights();
 323         });
 324
 325         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 326         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 327                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 328                 midi_mapper.refresh_lights();
 329         });
 330         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 331         // Even though we have a reset button right next to it, the fact that
 332         // the expanded audio view labels are clickable makes it natural to
 333         // click this one as well.
 334         connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
 335         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 336
 337         midi_mapper.refresh_highlights();
 338         midi_mapper.refresh_lights();
 339
 340         struct sigaction act;
 341         memset(&act, 0, sizeof(act));
 342         act.sa_handler = schedule_cut_signal;
 343         act.sa_flags = SA_RESTART;
 344         sigaction(SIGHUP, &act, nullptr);
 345
 346         // Mostly for debugging. Don't override SIGINT, that's so evil if
 347         // shutdown isn't instant.
 348         memset(&act, 0, sizeof(act));
 349         act.sa_handler = quit_signal;
 350         act.sa_flags = SA_RESTART;
 351         sigaction(SIGUSR1, &act, nullptr);
 352 }
 353
 354 void MainWindow::reset_audio_mapping_ui()
 355 {
 356         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 357
 358         ui->simple_audio_mode->setChecked(simple);
 359         ui->multichannel_audio_mode->setChecked(!simple);
 360         ui->input_mapping_action->setEnabled(!simple);
 361         ui->midi_mapping_action->setEnabled(!simple);
 362
 363         ui->locut_enabled->setVisible(simple);
 364         ui->gainstaging_label->setVisible(simple);
 365         ui->gainstaging_knob->setVisible(simple);
 366         ui->gainstaging_db_display->setVisible(simple);
 367         ui->gainstaging_auto_checkbox->setVisible(simple);
 368         ui->compressor_threshold_label->setVisible(simple);
 369         ui->compressor_threshold_knob->setVisible(simple);
 370         ui->compressor_threshold_db_display->setVisible(simple);
 371         ui->compressor_enabled->setVisible(simple);
 372
 373         setup_audio_miniview();
 374         setup_audio_expanded_view();
 375
 376         if (simple) {
 377                 ui->audio_views->setCurrentIndex(0);
 378         }
 379         ui->compact_header->setVisible(!simple);
 380
 381         midi_mapper.refresh_highlights();
 382         midi_mapper.refresh_lights();
 383 }
 384
 385 void MainWindow::setup_audio_miniview()
 386 {
 387         // Remove any existing channels.
 388         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 389                 delete item->widget();
 390                 delete item;
 391         }
 392         audio_miniviews.clear();
 393
 394         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 395                 return;
 396         }
 397
 398         // Set up brand new ones from the input mapping.
 399         InputMapping mapping = global_audio_mixer->get_input_mapping();
 400         audio_miniviews.resize(mapping.buses.size());
 401         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 402                 QWidget *channel = new QWidget(this);
 403                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 404                 ui_audio_miniview->setupUi(channel);
 405                 ui_audio_miniview->bus_desc_label->setFullText(
 406                         QString::fromStdString(mapping.buses[bus_index].name));
 407                 audio_miniviews[bus_index] = ui_audio_miniview;
 408
 409                 // Set up the peak meter.
 410                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 411                 peak_meter->set_min_level(-30.0f);
 412                 peak_meter->set_max_level(0.0f);
 413                 peak_meter->set_ref_level(0.0f);
 414
 415                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 416
 417                 ui->faders->addWidget(channel);
 418
 419                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 420                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 421                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 422                         [bus_index]() {
 423                                 global_audio_mixer->reset_peak(bus_index);
 424                         });
 425         }
 426 }
 427
 428 void MainWindow::setup_audio_expanded_view()
 429 {
 430         // Remove any existing channels.
 431         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 432                 delete item->widget();
 433                 delete item;
 434         }
 435         audio_expanded_views.clear();
 436
 437         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 438                 return;
 439         }
 440
 441         // Set up brand new ones from the input mapping.
 442         InputMapping mapping = global_audio_mixer->get_input_mapping();
 443         audio_expanded_views.resize(mapping.buses.size());
 444         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 445                 QWidget *channel = new QWidget(this);
 446                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 447                 ui_audio_expanded_view->setupUi(channel);
 448                 ui_audio_expanded_view->bus_desc_label->setFullText(
 449                         QString::fromStdString(mapping.buses[bus_index].name));
 450                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 451                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 452                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 453                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 454                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 455                 ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index) ? Qt::Checked : Qt::Unchecked);
 456                 connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
 457                         bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
 458                 ui->buses->addWidget(channel);
 459
 460                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 461                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 462                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 463                         midi_mapper.refresh_lights();
 464                 });
 465
 466                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 467                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 468                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 469                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 470                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 471                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 472
 473                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 474                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 475                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 476
 477                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 478                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 479                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 480                         midi_mapper.refresh_lights();
 481                 });
 482
 483                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 484                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 485                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 486                         midi_mapper.refresh_lights();
 487                 });
 488
 489                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 490
 491                 // Set up the peak meter.
 492                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 493                 peak_meter->set_min_level(-30.0f);
 494                 peak_meter->set_max_level(0.0f);
 495                 peak_meter->set_ref_level(0.0f);
 496
 497                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 498                         [this, bus_index]() {
 499                                 global_audio_mixer->reset_peak(bus_index);
 500                                 midi_mapper.refresh_lights();
 501                         });
 502
 503                 // Set up the compression attenuation meter.
 504                 VUMeter *reduction_meter = ui_audio_expanded_view->reduction_meter;
 505                 reduction_meter->set_min_level(0.0f);
 506                 reduction_meter->set_max_level(10.0f);
 507                 reduction_meter->set_ref_level(0.0f);
 508                 reduction_meter->set_flip(true);
 509         }
 510
 511         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 512 }
 513
 514 void MainWindow::mixer_shutting_down()
 515 {
 516         ui->me_live->clean_context();
 517         ui->me_preview->clean_context();
 518         for (Ui::Display *display : previews) {
 519                 display->display->clean_context();
 520         }
 521 }
 522
 523 void MainWindow::cut_triggered()
 524 {
 525         global_mixer->schedule_cut();
 526 }
 527
 528 void MainWindow::x264_bitrate_triggered()
 529 {
 530         bool ok;
 531         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);
 532         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 533                 global_flags.x264_bitrate = new_bitrate;
 534                 global_mixer->change_x264_bitrate(new_bitrate);
 535         }
 536 }
 537
 538 void MainWindow::exit_triggered()
 539 {
 540         close();
 541 }
 542
 543 void MainWindow::about_triggered()
 544 {
 545         AboutDialog().exec();
 546 }
 547
 548 void MainWindow::simple_audio_mode_triggered()
 549 {
 550         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 551                 return;
 552         }
 553         unsigned card_index = global_audio_mixer->get_simple_input();
 554         if (card_index == numeric_limits<unsigned>::max()) {
 555                 QMessageBox::StandardButton reply =
 556                         QMessageBox::question(this,
 557                                 "Mapping too complex",
 558                                 "The current audio mapping is too complicated to be representable in simple mode, "
 559                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 560                                 QMessageBox::Yes | QMessageBox::No);
 561                 if (reply == QMessageBox::No) {
 562                         ui->simple_audio_mode->setChecked(false);
 563                         ui->multichannel_audio_mode->setChecked(true);
 564                         return;
 565                 }
 566                 card_index = 0;
 567         }
 568         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 569         reset_audio_mapping_ui();
 570 }
 571
 572 void MainWindow::multichannel_audio_mode_triggered()
 573 {
 574         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 575                 return;
 576         }
 577
 578         // Take the generated input mapping from the simple input,
 579         // and set it as a normal multichannel mapping, which causes
 580         // the mode to go to multichannel.
 581         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 582         reset_audio_mapping_ui();
 583 }
 584
 585 void MainWindow::input_mapping_triggered()
 586 {
 587         if (InputMappingDialog().exec() == QDialog::Accepted) {
 588                 setup_audio_miniview();
 589                 setup_audio_expanded_view();
 590         }
 591         midi_mapper.refresh_highlights();
 592         midi_mapper.refresh_lights();
 593 }
 594
 595 void MainWindow::midi_mapping_triggered()
 596 {
 597         MIDIMappingDialog(&midi_mapper).exec();
 598 }
 599
 600 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 601 {
 602         if (bus_index == 0) {
 603                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 604         }
 605         if (bus_index < audio_expanded_views.size()) {
 606                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 607         }
 608
 609         float gain_db = value * 0.1f;
 610         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 611
 612         // The label will be updated by the audio level callback.
 613 }
 614
 615 void MainWindow::final_makeup_gain_knob_changed(int value)
 616 {
 617         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 618
 619         float gain_db = value * 0.1f;
 620         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 621
 622         // The label will be updated by the audio level callback.
 623 }
 624
 625 void MainWindow::cutoff_knob_changed(int value)
 626 {
 627         float octaves = value * 0.1f;
 628         float cutoff_hz = 20.0 * pow(2.0, octaves);
 629         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 630         update_cutoff_labels(cutoff_hz);
 631 }
 632
 633 void MainWindow::update_cutoff_labels(float cutoff_hz)
 634 {
 635         char buf[256];
 636         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 637         ui->locut_cutoff_display->setText(buf);
 638         ui->locut_cutoff_display_2->setText(buf);
 639
 640         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 641                 audio_expanded_views[bus_index]->locut_enabled->setText(
 642                         QString("Lo-cut: ") + buf);
 643         }
 644 }
 645
 646 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 647 {
 648         char time_str[256];
 649         if (estimated_seconds_left < 60.0) {
 650                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 651         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 652                 int s = lrintf(estimated_seconds_left);
 653                 int m = s / 60;
 654                 s %= 60;
 655                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 656         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 657                 int m = lrintf(estimated_seconds_left / 60.0);
 658                 snprintf(time_str, sizeof(time_str), "%dm", m);
 659         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 660                 int m = lrintf(estimated_seconds_left / 60.0);
 661                 int h = m / 60;
 662                 m %= 60;
 663                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 664         } else {  // More than ten hours: Xh.
 665                 int h = lrintf(estimated_seconds_left / 3600.0);
 666                 snprintf(time_str, sizeof(time_str), "%dh", h);
 667         }
 668         char buf[256];
 669         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 670
 671         std::string label = buf;
 672
 673         post_to_main_thread([this, label]{
 674                 disk_free_label->setText(QString::fromStdString(label));
 675                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 676         });
 677 }
 678
 679 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 680 {
 681         float gain_db = value * 0.1f;
 682         global_audio_mixer->set_eq(bus_index, band, gain_db);
 683
 684         update_eq_label(bus_index, band, gain_db);
 685 }
 686
 687 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 688 {
 689         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 690         string db_string = format_db(gain_db, DB_WITH_SIGN);
 691         switch (band) {
 692         case EQ_BAND_TREBLE:
 693                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 694                 break;
 695         case EQ_BAND_MID:
 696                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 697                 break;
 698         case EQ_BAND_BASS:
 699                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 700                 break;
 701         default:
 702                 assert(false);
 703         }
 704 }
 705
 706 void MainWindow::limiter_threshold_knob_changed(int value)
 707 {
 708         float threshold_dbfs = value * 0.1f;
 709         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 710         ui->limiter_threshold_db_display->setText(
 711                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 712         ui->limiter_threshold_db_display_2->setText(
 713                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 714 }
 715
 716 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 717 {
 718         float threshold_dbfs = value * 0.1f;
 719         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 720
 721         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 722         if (bus_index == 0) {
 723                 ui->compressor_threshold_db_display->setText(label);
 724         }
 725         if (bus_index < audio_expanded_views.size()) {
 726                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 727         }
 728 }
 729
 730 void MainWindow::mini_fader_changed(int bus, double volume_db)
 731 {
 732         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 733         audio_miniviews[bus]->fader_label->setText(label);
 734         audio_expanded_views[bus]->fader_label->setText(label);
 735
 736         global_audio_mixer->set_fader_volume(bus, volume_db);
 737 }
 738
 739 void MainWindow::mute_button_toggled(int bus, bool checked)
 740 {
 741         global_audio_mixer->set_mute(bus, checked);
 742         midi_mapper.refresh_lights();
 743 }
 744
 745 void MainWindow::reset_meters_button_clicked()
 746 {
 747         global_audio_mixer->reset_meters();
 748         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 749         ui->peak_display->setStyleSheet("");
 750 }
 751
 752 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 753                                       float global_level_lufs,
 754                                       float range_low_lufs, float range_high_lufs,
 755                                       float final_makeup_gain_db,
 756                                       float correlation)
 757 {
 758         steady_clock::time_point now = steady_clock::now();
 759
 760         // The meters are somewhat inefficient to update. Only update them
 761         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 762         // means that the digital peak meters are ever so slightly too low
 763         // (each update won't be a faithful representation of the highest peak
 764         // since the previous update, since there are frames we won't draw),
 765         // but the _peak_ of the peak meters will be correct (it's tracked in
 766         // AudioMixer, not here), and that's much more important.
 767         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 768         if (last_update_age < 0.100) {
 769                 return;
 770         }
 771         last_audio_level_callback = now;
 772
 773         post_to_main_thread([=]() {
 774                 ui->vu_meter->set_level(level_lufs);
 775                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 776                         if (bus_index < audio_miniviews.size()) {
 777                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 778                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 779                                 miniview->peak_meter->set_level(
 780                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 781                                 miniview->peak_meter->set_peak(
 782                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 783                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 784
 785                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 786                                 view->peak_meter->set_level(
 787                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 788                                 view->peak_meter->set_peak(
 789                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 790                                 view->reduction_meter->set_level(level.compressor_attenuation_db);
 791                                 view->gainstaging_knob->blockSignals(true);
 792                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 793                                 view->gainstaging_knob->blockSignals(false);
 794                                 view->gainstaging_db_display->setText(
 795                                         QString("Gain: ") +
 796                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 797                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 798
 799                                 midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
 800                         }
 801                 }
 802                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 803                 ui->correlation_meter->set_correlation(correlation);
 804
 805                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 806                 set_peak_label(ui->peak_display, peak_db);
 807
 808                 // NOTE: Will be invisible when using multitrack audio.
 809                 ui->gainstaging_knob->blockSignals(true);
 810                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 811                 ui->gainstaging_knob->blockSignals(false);
 812                 ui->gainstaging_db_display->setText(
 813                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 814
 815                 ui->makeup_gain_knob->blockSignals(true);
 816                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 817                 ui->makeup_gain_knob->blockSignals(false);
 818                 ui->makeup_gain_db_display->setText(
 819                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 820                 ui->makeup_gain_db_display_2->setText(
 821                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 822
 823                 // Peak labels could have changed.
 824                 midi_mapper.refresh_lights();
 825         });
 826 }
 827
 828 void MainWindow::relayout()
 829 {
 830         int height = ui->vertical_layout->geometry().height();
 831
 832         double remaining_height = height;
 833
 834         // Allocate the height; the most important part is to keep the main displays
 835         // at 16:9 if at all possible.
 836         double me_width = ui->me_preview->width();
 837         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 838
 839         // TODO: Scale the widths when we need to do this.
 840         if (me_height / double(height) > 0.8) {
 841                 me_height = height * 0.8;
 842         }
 843         remaining_height -= me_height + ui->vertical_layout->spacing();
 844
 845         // Space between the M/E displays and the audio strip.
 846         remaining_height -= ui->vertical_layout->spacing();
 847
 848         // The label above the audio strip.
 849         double compact_label_height = ui->compact_label->minimumHeight() +
 850                 ui->compact_audio_layout->spacing();
 851         remaining_height -= compact_label_height;
 852
 853         // The previews will be constrained by the remaining height, and the width.
 854         double preview_label_height = previews[0]->title_bar->geometry().height() +
 855                 previews[0]->main_vertical_layout->spacing();
 856         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 857         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 858         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 859
 860         ui->vertical_layout->setStretch(0, lrintf(me_height));
 861         ui->vertical_layout->setStretch(1,
 862                 lrintf(compact_label_height) +
 863                 lrintf(remaining_height) +
 864                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 865
 866         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 867         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 868         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 869
 870         // Set the widths for the previews.
 871         double preview_width = preview_height * 16.0 / 9.0;
 872         for (unsigned i = 0; i < previews.size(); ++i) {
 873                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 874         }
 875
 876         // The preview horizontal spacer.
 877         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 878         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 879 }
 880
 881 void MainWindow::set_locut(float value)
 882 {
 883         set_relative_value(ui->locut_cutoff_knob, value);
 884 }
 885
 886 void MainWindow::set_limiter_threshold(float value)
 887 {
 888         set_relative_value(ui->limiter_threshold_knob, value);
 889 }
 890
 891 void MainWindow::set_makeup_gain(float value)
 892 {
 893         set_relative_value(ui->makeup_gain_knob, value);
 894 }
 895
 896 void MainWindow::set_treble(unsigned bus_idx, float value)
 897 {
 898         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
 899 }
 900
 901 void MainWindow::set_mid(unsigned bus_idx, float value)
 902 {
 903         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
 904 }
 905
 906 void MainWindow::set_bass(unsigned bus_idx, float value)
 907 {
 908         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
 909 }
 910
 911 void MainWindow::set_gain(unsigned bus_idx, float value)
 912 {
 913         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
 914 }
 915
 916 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
 917 {
 918         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
 919 }
 920
 921 void MainWindow::set_fader(unsigned bus_idx, float value)
 922 {
 923         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
 924 }
 925
 926 void MainWindow::toggle_mute(unsigned bus_idx)
 927 {
 928         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
 929 }
 930
 931 void MainWindow::toggle_locut(unsigned bus_idx)
 932 {
 933         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
 934 }
 935
 936 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
 937 {
 938         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
 939 }
 940
 941 void MainWindow::toggle_compressor(unsigned bus_idx)
 942 {
 943         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
 944 }
 945
 946 void MainWindow::clear_peak(unsigned bus_idx)
 947 {
 948         post_to_main_thread([=]{
 949                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 950                         global_audio_mixer->reset_peak(bus_idx);
 951                         midi_mapper.set_has_peaked(bus_idx, false);
 952                         midi_mapper.refresh_lights();
 953                 }
 954         });
 955 }
 956
 957 void MainWindow::clear_all_highlights()
 958 {
 959         post_to_main_thread([this]{
 960                 highlight_locut(false);
 961                 highlight_limiter_threshold(false);
 962                 highlight_makeup_gain(false);
 963                 highlight_toggle_limiter(false);
 964                 highlight_toggle_auto_makeup_gain(false);
 965                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
 966                         highlight_treble(bus_idx, false);
 967                         highlight_mid(bus_idx, false);
 968                         highlight_bass(bus_idx, false);
 969                         highlight_gain(bus_idx, false);
 970                         highlight_compressor_threshold(bus_idx, false);
 971                         highlight_fader(bus_idx, false);
 972                         highlight_mute(bus_idx, false);
 973                         highlight_toggle_locut(bus_idx, false);
 974                         highlight_toggle_auto_gain_staging(bus_idx, false);
 975                         highlight_toggle_compressor(bus_idx, false);
 976                 }
 977         });
 978 }
 979
 980 void MainWindow::toggle_limiter()
 981 {
 982         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 983                 ui->limiter_enabled->click();
 984         }
 985 }
 986
 987 void MainWindow::toggle_auto_makeup_gain()
 988 {
 989         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 990                 ui->makeup_gain_auto_checkbox->click();
 991         }
 992 }
 993
 994 void MainWindow::highlight_locut(bool highlight)
 995 {
 996         post_to_main_thread([this, highlight]{
 997                 highlight_control(ui->locut_cutoff_knob, highlight);
 998                 highlight_control(ui->locut_cutoff_knob_2, highlight);
 999         });
1000 }
1001
1002 void MainWindow::highlight_limiter_threshold(bool highlight)
1003 {
1004         post_to_main_thread([this, highlight]{
1005                 highlight_control(ui->limiter_threshold_knob, highlight);
1006                 highlight_control(ui->limiter_threshold_knob_2, highlight);
1007         });
1008 }
1009
1010 void MainWindow::highlight_makeup_gain(bool highlight)
1011 {
1012         post_to_main_thread([this, highlight]{
1013                 highlight_control(ui->makeup_gain_knob, highlight);
1014                 highlight_control(ui->makeup_gain_knob_2, highlight);
1015         });
1016 }
1017
1018 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
1019 {
1020         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
1021 }
1022
1023 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
1024 {
1025         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
1026 }
1027
1028 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
1029 {
1030         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
1031 }
1032
1033 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
1034 {
1035         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
1036 }
1037
1038 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
1039 {
1040         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
1041 }
1042
1043 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1044 {
1045         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1046 }
1047
1048 void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
1049 {
1050         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
1051 }
1052
1053 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1054 {
1055         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1056 }
1057
1058 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1059 {
1060         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1061 }
1062
1063 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1064 {
1065         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1066 }
1067
1068 void MainWindow::highlight_toggle_limiter(bool highlight)
1069 {
1070         post_to_main_thread([this, highlight]{
1071                 highlight_control(ui->limiter_enabled, highlight);
1072                 highlight_control(ui->limiter_enabled_2, highlight);
1073         });
1074 }
1075
1076 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1077 {
1078         post_to_main_thread([this, highlight]{
1079                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1080                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1081         });
1082 }
1083
1084 template<class T>
1085 void MainWindow::set_relative_value(T *control, float value)
1086 {
1087         post_to_main_thread([control, value]{
1088                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1089         });
1090 }
1091
1092 template<class T>
1093 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1094 {
1095         if (global_audio_mixer != nullptr &&
1096             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1097             bus_idx < audio_expanded_views.size()) {
1098                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1099         }
1100 }
1101
1102 template<class T>
1103 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1104 {
1105         post_to_main_thread([this, bus_idx, control]{
1106                 if (global_audio_mixer != nullptr &&
1107                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1108                     bus_idx < audio_expanded_views.size()) {
1109                         (audio_expanded_views[bus_idx]->*control)->click();
1110                 }
1111         });
1112 }
1113
1114 template<class T>
1115 void MainWindow::highlight_control(T *control, bool highlight)
1116 {
1117         if (control == nullptr) {
1118                 return;
1119         }
1120         if (global_audio_mixer == nullptr ||
1121             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1122                 highlight = false;
1123         }
1124         if (highlight) {
1125                 control->setStyleSheet("background: rgb(0,255,0,80)");
1126         } else {
1127                 control->setStyleSheet("");
1128         }
1129 }
1130
1131 template<class T>
1132 void MainWindow::highlight_mute_control(T *control, bool highlight)
1133 {
1134         if (control == nullptr) {
1135                 return;
1136         }
1137         if (global_audio_mixer == nullptr ||
1138             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1139                 highlight = false;
1140         }
1141         if (highlight) {
1142                 control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
1143         } else {
1144                 control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
1145         }
1146 }
1147
1148 template<class T>
1149 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
1150 {
1151         post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
1152                 if (bus_idx < audio_expanded_views.size()) {
1153                         if (is_mute_button) {
1154                                 highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
1155                         } else {
1156                                 highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1157                         }
1158                 }
1159         });
1160 }
1161
1162 void MainWindow::set_transition_names(vector<string> transition_names)
1163 {
1164         if (transition_names.size() < 1 || transition_names[0].empty()) {
1165                 transition_btn1->setText(QString(""));
1166         } else {
1167                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1168                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1169         }
1170         if (transition_names.size() < 2 || transition_names[1].empty()) {
1171                 transition_btn2->setText(QString(""));
1172         } else {
1173                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1174                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1175         }
1176         if (transition_names.size() < 3 || transition_names[2].empty()) {
1177                 transition_btn3->setText(QString(""));
1178         } else {
1179                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1180                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1181         }
1182 }
1183
1184 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1185 {
1186         if (output >= Mixer::OUTPUT_INPUT0) {
1187                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1188                 previews[channel]->label->setText(name.c_str());
1189         }
1190 }
1191
1192 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1193 {
1194         if (output >= Mixer::OUTPUT_INPUT0) {
1195                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1196                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1197         }
1198 }
1199
1200 void MainWindow::transition_clicked(int transition_number)
1201 {
1202         global_mixer->transition_clicked(transition_number);
1203 }
1204
1205 void MainWindow::channel_clicked(int channel_number)
1206 {
1207         if (current_wb_pick_display == channel_number) {
1208                 // The picking was already done from eventFilter(), since we don't get
1209                 // the mouse pointer here.
1210         } else {
1211                 global_mixer->channel_clicked(channel_number);
1212         }
1213 }
1214
1215 void MainWindow::wb_button_clicked(int channel_number)
1216 {
1217         current_wb_pick_display = channel_number;
1218         QApplication::setOverrideCursor(Qt::CrossCursor);
1219 }
1220
1221 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1222 {
1223         if (current_wb_pick_display != -1 &&
1224             event->type() == QEvent::MouseButtonRelease &&
1225             watched->isWidgetType()) {
1226                 QApplication::restoreOverrideCursor();
1227                 if (watched == previews[current_wb_pick_display]->display) {
1228                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1229                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1230                 } else {
1231                         // The user clicked on something else, give up.
1232                         // (The click goes through, which might not be ideal, but, yes.)
1233                         current_wb_pick_display = -1;
1234                 }
1235         }
1236         return false;
1237 }
1238
1239 namespace {
1240
1241 double srgb_to_linear(double x)
1242 {
1243         if (x < 0.04045) {
1244                 return x / 12.92;
1245         } else {
1246                 return pow((x + 0.055) / 1.055, 2.4);
1247         }
1248 }
1249
1250 }  // namespace
1251
1252 void MainWindow::set_white_balance(int channel_number, int x, int y)
1253 {
1254         // Set the white balance to neutral for the grab. It's probably going to
1255         // flicker a bit, but hopefully this display is not live anyway.
1256         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1257         previews[channel_number]->display->updateGL();
1258         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1259
1260         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1261         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1262         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1263         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1264         previews[channel_number]->display->updateGL();
1265 }
1266
1267 void MainWindow::audio_state_changed()
1268 {
1269         post_to_main_thread([this]{
1270                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1271                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1272                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1273                         string suffix;
1274                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1275                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1276                                 if (state == ALSAPool::Device::State::STARTING) {
1277                                         suffix = " (busy)";
1278                                 } else if (state == ALSAPool::Device::State::DEAD) {
1279                                         suffix = " (dead)";
1280                                 }
1281                         }
1282
1283                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1284                                 QString::fromStdString(bus.name + suffix));
1285                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1286                                 QString::fromStdString(bus.name + suffix));
1287                 }
1288         });
1289 }