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

   1 #include "mainwindow.h"
   2
   3 #include <assert.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <QAbstractButton>
   9 #include <QAbstractSlider>
  10 #include <QAction>
  11 #include <QActionGroup>
  12 #include <QApplication>
  13 #include <QBoxLayout>
  14 #include <QCheckBox>
  15 #include <QDial>
  16 #include <QDialog>
  17 #include <QEvent>
  18 #include <QFlags>
  19 #include <QFrame>
  20 #include <QImage>
  21 #include <QInputDialog>
  22 #include <QKeySequence>
  23 #include <QLabel>
  24 #include <QLayoutItem>
  25 #include <QMenuBar>
  26 #include <QMessageBox>
  27 #include <QMouseEvent>
  28 #include <QObject>
  29 #include <QPushButton>
  30 #include <QRect>
  31 #include <QRgb>
  32 #include <QShortcut>
  33 #include <QStackedWidget>
  34 #include <QToolButton>
  35 #include <QWidget>
  36 #include <algorithm>
  37 #include <chrono>
  38 #include <cmath>
  39 #include <functional>
  40 #include <limits>
  41 #include <memory>
  42 #include <ratio>
  43 #include <string>
  44 #include <vector>
  45
  46 #include "aboutdialog.h"
  47 #include "alsa_pool.h"
  48 #include "clickable_label.h"
  49 #include "correlation_meter.h"
  50 #include "disk_space_estimator.h"
  51 #include "ellipsis_label.h"
  52 #include "flags.h"
  53 #include "glwidget.h"
  54 #include "input_mapping.h"
  55 #include "input_mapping_dialog.h"
  56 #include "lrameter.h"
  57 #include "midi_mapping.pb.h"
  58 #include "midi_mapping_dialog.h"
  59 #include "mixer.h"
  60 #include "nonlinear_fader.h"
  61 #include "post_to_main_thread.h"
  62 #include "ui_audio_expanded_view.h"
  63 #include "ui_audio_miniview.h"
  64 #include "ui_display.h"
  65 #include "ui_mainwindow.h"
  66 #include "vumeter.h"
  67
  68 using namespace std;
  69 using namespace std::chrono;
  70 using namespace std::placeholders;
  71
  72 Q_DECLARE_METATYPE(std::string);
  73 Q_DECLARE_METATYPE(std::vector<std::string>);
  74
  75 MainWindow *global_mainwindow = nullptr;
  76
  77 // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
  78 // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
  79 constexpr float peak_limit_dbfs = -0.1f;
  80
  81 namespace {
  82
  83 void schedule_cut_signal(int ignored)
  84 {
  85         global_mixer->schedule_cut();
  86 }
  87
  88 void quit_signal(int ignored)
  89 {
  90         global_mainwindow->close();
  91 }
  92
  93 void slave_knob(QDial *master, QDial *slave)
  94 {
  95         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  96                 slave->blockSignals(true);
  97                 slave->setValue(value);
  98                 slave->blockSignals(false);
  99         });
 100         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
 101                 master->setValue(value);
 102         });
 103 }
 104
 105 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
 106 {
 107         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
 108                 slave->blockSignals(true);
 109                 slave->setCheckState(Qt::CheckState(state));
 110                 slave->blockSignals(false);
 111         });
 112         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
 113                 master->setCheckState(Qt::CheckState(state));
 114         });
 115 }
 116
 117 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
 118 {
 119         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
 120                 slave->blockSignals(true);
 121                 slave->setDbValue(value);
 122                 slave->blockSignals(false);
 123         });
 124         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
 125                 master->setDbValue(value);
 126         });
 127 }
 128
 129 constexpr unsigned DB_NO_FLAGS = 0x0;
 130 constexpr unsigned DB_WITH_SIGN = 0x1;
 131 constexpr unsigned DB_BARE = 0x2;
 132
 133 string format_db(double db, unsigned flags)
 134 {
 135         string text;
 136         if (flags & DB_WITH_SIGN) {
 137                 if (isfinite(db)) {
 138                         char buf[256];
 139                         snprintf(buf, sizeof(buf), "%+.1f", db);
 140                         text = buf;
 141                 } else if (db < 0.0) {
 142                         text = "-∞";
 143                 } else {
 144                         // Should never happen, really.
 145                         text = "+∞";
 146                 }
 147         } else {
 148                 if (isfinite(db)) {
 149                         char buf[256];
 150                         snprintf(buf, sizeof(buf), "%.1f", db);
 151                         text = buf;
 152                 } else if (db < 0.0) {
 153                         text = "-∞";
 154                 } else {
 155                         // Should never happen, really.
 156                         text = "∞";
 157                 }
 158         }
 159         if (!(flags & DB_BARE)) {
 160                 text += " dB";
 161         }
 162         return text;
 163 }
 164
 165 void set_peak_label(QLabel *peak_label, float peak_db)
 166 {
 167         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 168
 169         if (peak_db > peak_limit_dbfs) {
 170                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 171         } else {
 172                 peak_label->setStyleSheet("");
 173         }
 174 }
 175
 176 }  // namespace
 177
 178 MainWindow::MainWindow()
 179         : ui(new Ui::MainWindow), midi_mapper(this)
 180 {
 181         global_mainwindow = this;
 182         ui->setupUi(this);
 183
 184         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 185         disk_free_label = new QLabel(this);
 186         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 187         ui->menuBar->setCornerWidget(disk_free_label);
 188
 189         QActionGroup *audio_mapping_group = new QActionGroup(this);
 190         ui->simple_audio_mode->setActionGroup(audio_mapping_group);
 191         ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
 192
 193         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 194         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 195
 196         // The menus.
 197         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 198         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 199         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 200         connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
 201         connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
 202         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 203         connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
 204
 205         if (global_flags.x264_video_to_http) {
 206                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 207         } else {
 208                 ui->x264_bitrate_action->setEnabled(false);
 209         }
 210
 211         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 212         // TODO: Make them dynamic.
 213         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 214         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 215         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 216
 217         // Aiee...
 218         transition_btn1 = ui->transition_btn1;
 219         transition_btn2 = ui->transition_btn2;
 220         transition_btn3 = ui->transition_btn3;
 221         qRegisterMetaType<string>("std::string");
 222         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 223         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 224         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 225
 226         // Hook up the prev/next buttons on the audio views.
 227         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 228         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 229         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 230         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 231
 232         // And bind the same to PgUp/PgDown.
 233         auto switch_page = [this]{
 234                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 235                         ui->audio_views->setCurrentIndex(1 - ui->audio_views->currentIndex());
 236                 }
 237         };
 238         connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, switch_page);
 239         connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, switch_page);
 240
 241         last_audio_level_callback = steady_clock::now() - seconds(1);
 242
 243         if (!global_flags.midi_mapping_filename.empty()) {
 244                 MIDIMappingProto midi_mapping;
 245                 if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
 246                         fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
 247                                 global_flags.midi_mapping_filename.c_str());
 248                         exit(1);
 249                 }
 250                 midi_mapper.set_midi_mapping(midi_mapping);
 251         }
 252         midi_mapper.refresh_highlights();
 253         midi_mapper.refresh_lights();
 254         midi_mapper.start_thread();
 255 }
 256
 257 void MainWindow::resizeEvent(QResizeEvent* event)
 258 {
 259         QMainWindow::resizeEvent(event);
 260
 261         // Ask for a relayout, but only after the event loop is done doing relayout
 262         // on everything else.
 263         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 264 }
 265
 266 void MainWindow::mixer_created(Mixer *mixer)
 267 {
 268         // Make the previews.
 269         unsigned num_previews = mixer->get_num_channels();
 270
 271         for (unsigned i = 0; i < num_previews; ++i) {
 272                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 273
 274                 QWidget *preview = new QWidget(this);
 275                 Ui::Display *ui_display = new Ui::Display;
 276                 ui_display->setupUi(preview);
 277                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 278                 ui_display->display->set_output(output);
 279                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 280                 previews.push_back(ui_display);
 281
 282                 // Hook up the click.
 283                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 284
 285                 // Let the theme update the text whenever the resolution or color changed.
 286                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 287                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 288
 289                 // Hook up the keyboard key.
 290                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 291                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 292
 293                 // Hook up the white balance button (irrelevant if invisible).
 294                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 295                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 296         }
 297
 298         global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
 299
 300         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 301         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 302         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 303         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 304         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 305
 306         reset_audio_mapping_ui();
 307
 308         // TODO: Fetch all of the values these for completeness,
 309         // not just the enable knobs implied by flags.
 310         ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
 311         ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
 312
 313         // Controls used only for simple audio fetch their state from the first bus.
 314         constexpr unsigned simple_bus_index = 0;
 315         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 316                 ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
 317                 ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
 318                 ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
 319                 ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
 320                 ui->compressor_threshold_db_display->setText(
 321                         QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
 322         }
 323         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 324                 global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
 325                 midi_mapper.refresh_lights();
 326         });
 327         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
 328                 bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
 329         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 330                 global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
 331                 midi_mapper.refresh_lights();
 332         });
 333         connect(ui->compressor_threshold_knob, &QDial::valueChanged,
 334                 bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
 335         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
 336                 global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
 337                 midi_mapper.refresh_lights();
 338         });
 339
 340         // Global mastering controls.
 341         QString limiter_threshold_label(
 342                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 343         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 344         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 345
 346         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 347         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 348
 349         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 350         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 351                 global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
 352                 midi_mapper.refresh_lights();
 353         });
 354
 355         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 356         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 357                 global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
 358                 midi_mapper.refresh_lights();
 359         });
 360         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 361         // Even though we have a reset button right next to it, the fact that
 362         // the expanded audio view labels are clickable makes it natural to
 363         // click this one as well.
 364         connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
 365         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 366
 367         midi_mapper.refresh_highlights();
 368         midi_mapper.refresh_lights();
 369
 370         struct sigaction act;
 371         memset(&act, 0, sizeof(act));
 372         act.sa_handler = schedule_cut_signal;
 373         act.sa_flags = SA_RESTART;
 374         sigaction(SIGHUP, &act, nullptr);
 375
 376         // Mostly for debugging. Don't override SIGINT, that's so evil if
 377         // shutdown isn't instant.
 378         memset(&act, 0, sizeof(act));
 379         act.sa_handler = quit_signal;
 380         act.sa_flags = SA_RESTART;
 381         sigaction(SIGUSR1, &act, nullptr);
 382 }
 383
 384 void MainWindow::reset_audio_mapping_ui()
 385 {
 386         bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
 387
 388         ui->simple_audio_mode->setChecked(simple);
 389         ui->multichannel_audio_mode->setChecked(!simple);
 390         ui->input_mapping_action->setEnabled(!simple);
 391         ui->midi_mapping_action->setEnabled(!simple);
 392
 393         ui->locut_enabled->setVisible(simple);
 394         ui->gainstaging_label->setVisible(simple);
 395         ui->gainstaging_knob->setVisible(simple);
 396         ui->gainstaging_db_display->setVisible(simple);
 397         ui->gainstaging_auto_checkbox->setVisible(simple);
 398         ui->compressor_threshold_label->setVisible(simple);
 399         ui->compressor_threshold_knob->setVisible(simple);
 400         ui->compressor_threshold_db_display->setVisible(simple);
 401         ui->compressor_enabled->setVisible(simple);
 402
 403         setup_audio_miniview();
 404         setup_audio_expanded_view();
 405
 406         if (simple) {
 407                 ui->audio_views->setCurrentIndex(0);
 408         }
 409         ui->compact_header->setVisible(!simple);
 410
 411         midi_mapper.refresh_highlights();
 412         midi_mapper.refresh_lights();
 413 }
 414
 415 void MainWindow::setup_audio_miniview()
 416 {
 417         // Remove any existing channels.
 418         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 419                 delete item->widget();
 420                 delete item;
 421         }
 422         audio_miniviews.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_miniviews.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::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 434                 ui_audio_miniview->setupUi(channel);
 435                 ui_audio_miniview->bus_desc_label->setFullText(
 436                         QString::fromStdString(mapping.buses[bus_index].name));
 437                 audio_miniviews[bus_index] = ui_audio_miniview;
 438
 439                 // Set up the peak meter.
 440                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 441                 peak_meter->set_min_level(-30.0f);
 442                 peak_meter->set_max_level(0.0f);
 443                 peak_meter->set_ref_level(0.0f);
 444
 445                 ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 446
 447                 ui->faders->addWidget(channel);
 448
 449                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 450                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 451                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 452                         [bus_index]() {
 453                                 global_audio_mixer->reset_peak(bus_index);
 454                         });
 455         }
 456 }
 457
 458 void MainWindow::setup_audio_expanded_view()
 459 {
 460         // Remove any existing channels.
 461         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 462                 delete item->widget();
 463                 delete item;
 464         }
 465         audio_expanded_views.clear();
 466
 467         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 468                 return;
 469         }
 470
 471         // Set up brand new ones from the input mapping.
 472         InputMapping mapping = global_audio_mixer->get_input_mapping();
 473         audio_expanded_views.resize(mapping.buses.size());
 474         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 475                 QWidget *channel = new QWidget(this);
 476                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 477                 ui_audio_expanded_view->setupUi(channel);
 478                 ui_audio_expanded_view->bus_desc_label->setFullText(
 479                         QString::fromStdString(mapping.buses[bus_index].name));
 480                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 481                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
 482                 update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
 483                 update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
 484                 ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
 485                 ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index) ? Qt::Checked : Qt::Unchecked);
 486                 connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
 487                         bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
 488                 ui->buses->addWidget(channel);
 489
 490                 ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
 491                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 492                         global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
 493                         midi_mapper.refresh_lights();
 494                 });
 495
 496                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 497                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 498                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 499                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 500                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 501                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 502
 503                 ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
 504                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
 505                 ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
 506
 507                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 508                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 509                         global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
 510                         midi_mapper.refresh_lights();
 511                 });
 512
 513                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 514                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 515                         global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
 516                         midi_mapper.refresh_lights();
 517                 });
 518
 519                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 520
 521                 // Set up the peak meter.
 522                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 523                 peak_meter->set_min_level(-30.0f);
 524                 peak_meter->set_max_level(0.0f);
 525                 peak_meter->set_ref_level(0.0f);
 526
 527                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 528                         [this, bus_index]() {
 529                                 global_audio_mixer->reset_peak(bus_index);
 530                                 midi_mapper.refresh_lights();
 531                         });
 532         }
 533
 534         update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
 535 }
 536
 537 void MainWindow::mixer_shutting_down()
 538 {
 539         ui->me_live->clean_context();
 540         ui->me_preview->clean_context();
 541         for (Ui::Display *display : previews) {
 542                 display->display->clean_context();
 543         }
 544 }
 545
 546 void MainWindow::cut_triggered()
 547 {
 548         global_mixer->schedule_cut();
 549 }
 550
 551 void MainWindow::x264_bitrate_triggered()
 552 {
 553         bool ok;
 554         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);
 555         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 556                 global_flags.x264_bitrate = new_bitrate;
 557                 global_mixer->change_x264_bitrate(new_bitrate);
 558         }
 559 }
 560
 561 void MainWindow::exit_triggered()
 562 {
 563         close();
 564 }
 565
 566 void MainWindow::about_triggered()
 567 {
 568         AboutDialog().exec();
 569 }
 570
 571 void MainWindow::simple_audio_mode_triggered()
 572 {
 573         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
 574                 return;
 575         }
 576         unsigned card_index = global_audio_mixer->get_simple_input();
 577         if (card_index == numeric_limits<unsigned>::max()) {
 578                 QMessageBox::StandardButton reply =
 579                         QMessageBox::question(this,
 580                                 "Mapping too complex",
 581                                 "The current audio mapping is too complicated to be representable in simple mode, "
 582                                         "and will be discarded if you proceed. Really go to simple audio mode?",
 583                                 QMessageBox::Yes | QMessageBox::No);
 584                 if (reply == QMessageBox::No) {
 585                         ui->simple_audio_mode->setChecked(false);
 586                         ui->multichannel_audio_mode->setChecked(true);
 587                         return;
 588                 }
 589                 card_index = 0;
 590         }
 591         global_audio_mixer->set_simple_input(/*card_index=*/card_index);
 592         reset_audio_mapping_ui();
 593 }
 594
 595 void MainWindow::multichannel_audio_mode_triggered()
 596 {
 597         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 598                 return;
 599         }
 600
 601         // Take the generated input mapping from the simple input,
 602         // and set it as a normal multichannel mapping, which causes
 603         // the mode to go to multichannel.
 604         global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
 605         reset_audio_mapping_ui();
 606 }
 607
 608 void MainWindow::input_mapping_triggered()
 609 {
 610         if (InputMappingDialog().exec() == QDialog::Accepted) {
 611                 setup_audio_miniview();
 612                 setup_audio_expanded_view();
 613         }
 614         midi_mapper.refresh_highlights();
 615         midi_mapper.refresh_lights();
 616 }
 617
 618 void MainWindow::midi_mapping_triggered()
 619 {
 620         MIDIMappingDialog(&midi_mapper).exec();
 621 }
 622
 623 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 624 {
 625         if (bus_index == 0) {
 626                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 627         }
 628         if (bus_index < audio_expanded_views.size()) {
 629                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 630         }
 631
 632         float gain_db = value * 0.1f;
 633         global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 634
 635         // The label will be updated by the audio level callback.
 636 }
 637
 638 void MainWindow::final_makeup_gain_knob_changed(int value)
 639 {
 640         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 641
 642         float gain_db = value * 0.1f;
 643         global_audio_mixer->set_final_makeup_gain_db(gain_db);
 644
 645         // The label will be updated by the audio level callback.
 646 }
 647
 648 void MainWindow::cutoff_knob_changed(int value)
 649 {
 650         float octaves = value * 0.1f;
 651         float cutoff_hz = 20.0 * pow(2.0, octaves);
 652         global_audio_mixer->set_locut_cutoff(cutoff_hz);
 653         update_cutoff_labels(cutoff_hz);
 654 }
 655
 656 void MainWindow::update_cutoff_labels(float cutoff_hz)
 657 {
 658         char buf[256];
 659         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 660         ui->locut_cutoff_display->setText(buf);
 661         ui->locut_cutoff_display_2->setText(buf);
 662
 663         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 664                 audio_expanded_views[bus_index]->locut_enabled->setText(
 665                         QString("Lo-cut: ") + buf);
 666         }
 667 }
 668
 669 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 670 {
 671         char time_str[256];
 672         if (estimated_seconds_left < 60.0) {
 673                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 674         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 675                 int s = lrintf(estimated_seconds_left);
 676                 int m = s / 60;
 677                 s %= 60;
 678                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 679         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 680                 int m = lrintf(estimated_seconds_left / 60.0);
 681                 snprintf(time_str, sizeof(time_str), "%dm", m);
 682         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 683                 int m = lrintf(estimated_seconds_left / 60.0);
 684                 int h = m / 60;
 685                 m %= 60;
 686                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 687         } else {  // More than ten hours: Xh.
 688                 int h = lrintf(estimated_seconds_left / 3600.0);
 689                 snprintf(time_str, sizeof(time_str), "%dh", h);
 690         }
 691         char buf[256];
 692         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 693
 694         std::string label = buf;
 695
 696         post_to_main_thread([this, label]{
 697                 disk_free_label->setText(QString::fromStdString(label));
 698                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 699         });
 700 }
 701
 702 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 703 {
 704         float gain_db = value * 0.1f;
 705         global_audio_mixer->set_eq(bus_index, band, gain_db);
 706
 707         update_eq_label(bus_index, band, gain_db);
 708 }
 709
 710 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 711 {
 712         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 713         string db_string = format_db(gain_db, DB_WITH_SIGN);
 714         switch (band) {
 715         case EQ_BAND_TREBLE:
 716                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 717                 break;
 718         case EQ_BAND_MID:
 719                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 720                 break;
 721         case EQ_BAND_BASS:
 722                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 723                 break;
 724         default:
 725                 assert(false);
 726         }
 727 }
 728
 729 void MainWindow::limiter_threshold_knob_changed(int value)
 730 {
 731         float threshold_dbfs = value * 0.1f;
 732         global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
 733         ui->limiter_threshold_db_display->setText(
 734                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 735         ui->limiter_threshold_db_display_2->setText(
 736                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 737 }
 738
 739 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 740 {
 741         float threshold_dbfs = value * 0.1f;
 742         global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 743
 744         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 745         if (bus_index == 0) {
 746                 ui->compressor_threshold_db_display->setText(label);
 747         }
 748         if (bus_index < audio_expanded_views.size()) {
 749                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 750         }
 751 }
 752
 753 void MainWindow::mini_fader_changed(int bus, double volume_db)
 754 {
 755         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 756         audio_miniviews[bus]->fader_label->setText(label);
 757         audio_expanded_views[bus]->fader_label->setText(label);
 758
 759         global_audio_mixer->set_fader_volume(bus, volume_db);
 760 }
 761
 762 void MainWindow::mute_button_toggled(int bus, bool checked)
 763 {
 764         global_audio_mixer->set_mute(bus, checked);
 765         midi_mapper.refresh_lights();
 766 }
 767
 768 void MainWindow::reset_meters_button_clicked()
 769 {
 770         global_audio_mixer->reset_meters();
 771         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 772         ui->peak_display->setStyleSheet("");
 773 }
 774
 775 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 776                                       float global_level_lufs,
 777                                       float range_low_lufs, float range_high_lufs,
 778                                       float final_makeup_gain_db,
 779                                       float correlation)
 780 {
 781         steady_clock::time_point now = steady_clock::now();
 782
 783         // The meters are somewhat inefficient to update. Only update them
 784         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 785         // means that the digital peak meters are ever so slightly too low
 786         // (each update won't be a faithful representation of the highest peak
 787         // since the previous update, since there are frames we won't draw),
 788         // but the _peak_ of the peak meters will be correct (it's tracked in
 789         // AudioMixer, not here), and that's much more important.
 790         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 791         if (last_update_age < 0.100) {
 792                 return;
 793         }
 794         last_audio_level_callback = now;
 795
 796         post_to_main_thread([=]() {
 797                 ui->vu_meter->set_level(level_lufs);
 798                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 799                         if (bus_index < audio_miniviews.size()) {
 800                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 801                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 802                                 miniview->peak_meter->set_level(
 803                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 804                                 miniview->peak_meter->set_peak(
 805                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 806                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 807
 808                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 809                                 view->peak_meter->set_level(
 810                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 811                                 view->peak_meter->set_peak(
 812                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 813                                 view->reduction_meter->set_reduction_db(level.compressor_attenuation_db);
 814                                 view->gainstaging_knob->blockSignals(true);
 815                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 816                                 view->gainstaging_knob->blockSignals(false);
 817                                 view->gainstaging_db_display->setText(
 818                                         QString("Gain: ") +
 819                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 820                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 821
 822                                 midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
 823                         }
 824                 }
 825                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 826                 ui->correlation_meter->set_correlation(correlation);
 827
 828                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 829                 set_peak_label(ui->peak_display, peak_db);
 830
 831                 // NOTE: Will be invisible when using multitrack audio.
 832                 ui->gainstaging_knob->blockSignals(true);
 833                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 834                 ui->gainstaging_knob->blockSignals(false);
 835                 ui->gainstaging_db_display->setText(
 836                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 837
 838                 ui->makeup_gain_knob->blockSignals(true);
 839                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 840                 ui->makeup_gain_knob->blockSignals(false);
 841                 ui->makeup_gain_db_display->setText(
 842                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 843                 ui->makeup_gain_db_display_2->setText(
 844                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 845
 846                 // Peak labels could have changed.
 847                 midi_mapper.refresh_lights();
 848         });
 849 }
 850
 851 void MainWindow::relayout()
 852 {
 853         int height = ui->vertical_layout->geometry().height();
 854
 855         double remaining_height = height;
 856
 857         // Allocate the height; the most important part is to keep the main displays
 858         // at 16:9 if at all possible.
 859         double me_width = ui->me_preview->width();
 860         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 861
 862         // TODO: Scale the widths when we need to do this.
 863         if (me_height / double(height) > 0.8) {
 864                 me_height = height * 0.8;
 865         }
 866         remaining_height -= me_height + ui->vertical_layout->spacing();
 867
 868         // Space between the M/E displays and the audio strip.
 869         remaining_height -= ui->vertical_layout->spacing();
 870
 871         // The label above the audio strip.
 872         double compact_label_height = ui->compact_label->minimumHeight() +
 873                 ui->compact_audio_layout->spacing();
 874         remaining_height -= compact_label_height;
 875
 876         // The previews will be constrained by the remaining height, and the width.
 877         double preview_label_height = previews[0]->title_bar->geometry().height() +
 878                 previews[0]->main_vertical_layout->spacing();
 879         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 880         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 881         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 882
 883         ui->vertical_layout->setStretch(0, lrintf(me_height));
 884         ui->vertical_layout->setStretch(1,
 885                 lrintf(compact_label_height) +
 886                 lrintf(remaining_height) +
 887                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 888
 889         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 890         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 891         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 892
 893         // Set the widths for the previews.
 894         double preview_width = preview_height * 16.0 / 9.0;
 895         for (unsigned i = 0; i < previews.size(); ++i) {
 896                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 897         }
 898
 899         // The preview horizontal spacer.
 900         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 901         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 902 }
 903
 904 void MainWindow::set_locut(float value)
 905 {
 906         set_relative_value(ui->locut_cutoff_knob, value);
 907 }
 908
 909 void MainWindow::set_limiter_threshold(float value)
 910 {
 911         set_relative_value(ui->limiter_threshold_knob, value);
 912 }
 913
 914 void MainWindow::set_makeup_gain(float value)
 915 {
 916         set_relative_value(ui->makeup_gain_knob, value);
 917 }
 918
 919 void MainWindow::set_treble(unsigned bus_idx, float value)
 920 {
 921         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
 922 }
 923
 924 void MainWindow::set_mid(unsigned bus_idx, float value)
 925 {
 926         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
 927 }
 928
 929 void MainWindow::set_bass(unsigned bus_idx, float value)
 930 {
 931         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
 932 }
 933
 934 void MainWindow::set_gain(unsigned bus_idx, float value)
 935 {
 936         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
 937 }
 938
 939 void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
 940 {
 941         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
 942 }
 943
 944 void MainWindow::set_fader(unsigned bus_idx, float value)
 945 {
 946         set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
 947 }
 948
 949 void MainWindow::toggle_mute(unsigned bus_idx)
 950 {
 951         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
 952 }
 953
 954 void MainWindow::toggle_locut(unsigned bus_idx)
 955 {
 956         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
 957 }
 958
 959 void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
 960 {
 961         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
 962 }
 963
 964 void MainWindow::toggle_compressor(unsigned bus_idx)
 965 {
 966         click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
 967 }
 968
 969 void MainWindow::clear_peak(unsigned bus_idx)
 970 {
 971         post_to_main_thread([=]{
 972                 if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
 973                         global_audio_mixer->reset_peak(bus_idx);
 974                         midi_mapper.set_has_peaked(bus_idx, false);
 975                         midi_mapper.refresh_lights();
 976                 }
 977         });
 978 }
 979
 980 void MainWindow::clear_all_highlights()
 981 {
 982         post_to_main_thread([this]{
 983                 highlight_locut(false);
 984                 highlight_limiter_threshold(false);
 985                 highlight_makeup_gain(false);
 986                 highlight_toggle_limiter(false);
 987                 highlight_toggle_auto_makeup_gain(false);
 988                 for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
 989                         highlight_treble(bus_idx, false);
 990                         highlight_mid(bus_idx, false);
 991                         highlight_bass(bus_idx, false);
 992                         highlight_gain(bus_idx, false);
 993                         highlight_compressor_threshold(bus_idx, false);
 994                         highlight_fader(bus_idx, false);
 995                         highlight_mute(bus_idx, false);
 996                         highlight_toggle_locut(bus_idx, false);
 997                         highlight_toggle_auto_gain_staging(bus_idx, false);
 998                         highlight_toggle_compressor(bus_idx, false);
 999                 }
1000         });
1001 }
1002
1003 void MainWindow::toggle_limiter()
1004 {
1005         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1006                 ui->limiter_enabled->click();
1007         }
1008 }
1009
1010 void MainWindow::toggle_auto_makeup_gain()
1011 {
1012         if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
1013                 ui->makeup_gain_auto_checkbox->click();
1014         }
1015 }
1016
1017 void MainWindow::highlight_locut(bool highlight)
1018 {
1019         post_to_main_thread([this, highlight]{
1020                 highlight_control(ui->locut_cutoff_knob, highlight);
1021                 highlight_control(ui->locut_cutoff_knob_2, highlight);
1022         });
1023 }
1024
1025 void MainWindow::highlight_limiter_threshold(bool highlight)
1026 {
1027         post_to_main_thread([this, highlight]{
1028                 highlight_control(ui->limiter_threshold_knob, highlight);
1029                 highlight_control(ui->limiter_threshold_knob_2, highlight);
1030         });
1031 }
1032
1033 void MainWindow::highlight_makeup_gain(bool highlight)
1034 {
1035         post_to_main_thread([this, highlight]{
1036                 highlight_control(ui->makeup_gain_knob, highlight);
1037                 highlight_control(ui->makeup_gain_knob_2, highlight);
1038         });
1039 }
1040
1041 void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
1042 {
1043         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
1044 }
1045
1046 void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
1047 {
1048         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
1049 }
1050
1051 void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
1052 {
1053         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
1054 }
1055
1056 void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
1057 {
1058         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
1059 }
1060
1061 void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
1062 {
1063         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
1064 }
1065
1066 void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
1067 {
1068         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
1069 }
1070
1071 void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
1072 {
1073         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
1074 }
1075
1076 void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
1077 {
1078         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
1079 }
1080
1081 void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
1082 {
1083         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
1084 }
1085
1086 void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
1087 {
1088         highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
1089 }
1090
1091 void MainWindow::highlight_toggle_limiter(bool highlight)
1092 {
1093         post_to_main_thread([this, highlight]{
1094                 highlight_control(ui->limiter_enabled, highlight);
1095                 highlight_control(ui->limiter_enabled_2, highlight);
1096         });
1097 }
1098
1099 void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
1100 {
1101         post_to_main_thread([this, highlight]{
1102                 highlight_control(ui->makeup_gain_auto_checkbox, highlight);
1103                 highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
1104         });
1105 }
1106
1107 template<class T>
1108 void MainWindow::set_relative_value(T *control, float value)
1109 {
1110         post_to_main_thread([control, value]{
1111                 control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
1112         });
1113 }
1114
1115 template<class T>
1116 void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
1117 {
1118         if (global_audio_mixer != nullptr &&
1119             global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1120             bus_idx < audio_expanded_views.size()) {
1121                 set_relative_value(audio_expanded_views[bus_idx]->*control, value);
1122         }
1123 }
1124
1125 template<class T>
1126 void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
1127 {
1128         post_to_main_thread([this, bus_idx, control]{
1129                 if (global_audio_mixer != nullptr &&
1130                     global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
1131                     bus_idx < audio_expanded_views.size()) {
1132                         (audio_expanded_views[bus_idx]->*control)->click();
1133                 }
1134         });
1135 }
1136
1137 template<class T>
1138 void MainWindow::highlight_control(T *control, bool highlight)
1139 {
1140         if (control == nullptr) {
1141                 return;
1142         }
1143         if (global_audio_mixer == nullptr ||
1144             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1145                 highlight = false;
1146         }
1147         if (highlight) {
1148                 control->setStyleSheet("background: rgb(0,255,0,80)");
1149         } else {
1150                 control->setStyleSheet("");
1151         }
1152 }
1153
1154 template<class T>
1155 void MainWindow::highlight_mute_control(T *control, bool highlight)
1156 {
1157         if (control == nullptr) {
1158                 return;
1159         }
1160         if (global_audio_mixer == nullptr ||
1161             global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
1162                 highlight = false;
1163         }
1164         if (highlight) {
1165                 control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
1166         } else {
1167                 control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
1168         }
1169 }
1170
1171 template<class T>
1172 void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
1173 {
1174         post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
1175                 if (bus_idx < audio_expanded_views.size()) {
1176                         if (is_mute_button) {
1177                                 highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
1178                         } else {
1179                                 highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
1180                         }
1181                 }
1182         });
1183 }
1184
1185 void MainWindow::set_transition_names(vector<string> transition_names)
1186 {
1187         if (transition_names.size() < 1 || transition_names[0].empty()) {
1188                 transition_btn1->setText(QString(""));
1189         } else {
1190                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
1191                 ui->transition_btn1->setShortcut(QKeySequence("J"));
1192         }
1193         if (transition_names.size() < 2 || transition_names[1].empty()) {
1194                 transition_btn2->setText(QString(""));
1195         } else {
1196                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
1197                 ui->transition_btn2->setShortcut(QKeySequence("K"));
1198         }
1199         if (transition_names.size() < 3 || transition_names[2].empty()) {
1200                 transition_btn3->setText(QString(""));
1201         } else {
1202                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
1203                 ui->transition_btn3->setShortcut(QKeySequence("L"));
1204         }
1205 }
1206
1207 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
1208 {
1209         if (output >= Mixer::OUTPUT_INPUT0) {
1210                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1211                 previews[channel]->label->setText(name.c_str());
1212         }
1213 }
1214
1215 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
1216 {
1217         if (output >= Mixer::OUTPUT_INPUT0) {
1218                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
1219                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
1220         }
1221 }
1222
1223 void MainWindow::transition_clicked(int transition_number)
1224 {
1225         global_mixer->transition_clicked(transition_number);
1226 }
1227
1228 void MainWindow::channel_clicked(int channel_number)
1229 {
1230         if (current_wb_pick_display == channel_number) {
1231                 // The picking was already done from eventFilter(), since we don't get
1232                 // the mouse pointer here.
1233         } else {
1234                 global_mixer->channel_clicked(channel_number);
1235         }
1236 }
1237
1238 void MainWindow::wb_button_clicked(int channel_number)
1239 {
1240         current_wb_pick_display = channel_number;
1241         QApplication::setOverrideCursor(Qt::CrossCursor);
1242 }
1243
1244 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
1245 {
1246         if (current_wb_pick_display != -1 &&
1247             event->type() == QEvent::MouseButtonRelease &&
1248             watched->isWidgetType()) {
1249                 QApplication::restoreOverrideCursor();
1250                 if (watched == previews[current_wb_pick_display]->display) {
1251                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
1252                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
1253                 } else {
1254                         // The user clicked on something else, give up.
1255                         // (The click goes through, which might not be ideal, but, yes.)
1256                         current_wb_pick_display = -1;
1257                 }
1258         }
1259         return false;
1260 }
1261
1262 namespace {
1263
1264 double srgb_to_linear(double x)
1265 {
1266         if (x < 0.04045) {
1267                 return x / 12.92;
1268         } else {
1269                 return pow((x + 0.055) / 1.055, 2.4);
1270         }
1271 }
1272
1273 }  // namespace
1274
1275 void MainWindow::set_white_balance(int channel_number, int x, int y)
1276 {
1277         // Set the white balance to neutral for the grab. It's probably going to
1278         // flicker a bit, but hopefully this display is not live anyway.
1279         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
1280         previews[channel_number]->display->updateGL();
1281         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
1282
1283         double r = srgb_to_linear(qRed(reference_color) / 255.0);
1284         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
1285         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
1286         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
1287         previews[channel_number]->display->updateGL();
1288 }
1289
1290 void MainWindow::audio_state_changed()
1291 {
1292         post_to_main_thread([this]{
1293                 InputMapping mapping = global_audio_mixer->get_input_mapping();
1294                 for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
1295                         const InputMapping::Bus &bus = mapping.buses[bus_index];
1296                         string suffix;
1297                         if (bus.device.type == InputSourceType::ALSA_INPUT) {
1298                                 ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
1299                                 if (state == ALSAPool::Device::State::STARTING) {
1300                                         suffix = " (busy)";
1301                                 } else if (state == ALSAPool::Device::State::DEAD) {
1302                                         suffix = " (dead)";
1303                                 }
1304                         }
1305
1306                         audio_miniviews[bus_index]->bus_desc_label->setFullText(
1307                                 QString::fromStdString(bus.name + suffix));
1308                         audio_expanded_views[bus_index]->bus_desc_label->setFullText(
1309                                 QString::fromStdString(bus.name + suffix));
1310                 }
1311         });
1312 }