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 <QMetaType>
  15 #include <QPushButton>
  16 #include <QResizeEvent>
  17 #include <QShortcut>
  18 #include <QSize>
  19 #include <QString>
  20
  21 #include "aboutdialog.h"
  22 #include "disk_space_estimator.h"
  23 #include "flags.h"
  24 #include "glwidget.h"
  25 #include "input_mapping_dialog.h"
  26 #include "lrameter.h"
  27 #include "mixer.h"
  28 #include "post_to_main_thread.h"
  29 #include "ui_audio_miniview.h"
  30 #include "ui_audio_expanded_view.h"
  31 #include "ui_display.h"
  32 #include "ui_mainwindow.h"
  33 #include "vumeter.h"
  34
  35 class QResizeEvent;
  36
  37 using namespace std;
  38 using namespace std::chrono;
  39 using namespace std::placeholders;
  40
  41 Q_DECLARE_METATYPE(std::string);
  42 Q_DECLARE_METATYPE(std::vector<std::string>);
  43
  44 MainWindow *global_mainwindow = nullptr;
  45
  46 namespace {
  47
  48 void schedule_cut_signal(int ignored)
  49 {
  50         global_mixer->schedule_cut();
  51 }
  52
  53 void quit_signal(int ignored)
  54 {
  55         global_mainwindow->close();
  56 }
  57
  58 void slave_knob(QDial *master, QDial *slave)
  59 {
  60         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  61                 slave->blockSignals(true);
  62                 slave->setValue(value);
  63                 slave->blockSignals(false);
  64         });
  65         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
  66                 master->setValue(value);
  67         });
  68 }
  69
  70 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
  71 {
  72         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
  73                 slave->blockSignals(true);
  74                 slave->setCheckState(Qt::CheckState(state));
  75                 slave->blockSignals(false);
  76         });
  77         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
  78                 master->setCheckState(Qt::CheckState(state));
  79         });
  80 }
  81
  82 void slave_fader(NonLinearFader *master, NonLinearFader *slave)
  83 {
  84         QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
  85                 slave->blockSignals(true);
  86                 slave->setDbValue(value);
  87                 slave->blockSignals(false);
  88         });
  89         QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
  90                 master->setDbValue(value);
  91         });
  92 }
  93
  94 constexpr unsigned DB_NO_FLAGS = 0x0;
  95 constexpr unsigned DB_WITH_SIGN = 0x1;
  96 constexpr unsigned DB_BARE = 0x2;
  97
  98 string format_db(double db, unsigned flags)
  99 {
 100         string text;
 101         if (flags & DB_WITH_SIGN) {
 102                 if (isfinite(db)) {
 103                         char buf[256];
 104                         snprintf(buf, sizeof(buf), "%+.1f", db);
 105                         text = buf;
 106                 } else if (db < 0.0) {
 107                         text = "-∞";
 108                 } else {
 109                         // Should never happen, really.
 110                         text = "+∞";
 111                 }
 112         } else {
 113                 if (isfinite(db)) {
 114                         char buf[256];
 115                         snprintf(buf, sizeof(buf), "%.1f", db);
 116                         text = buf;
 117                 } else if (db < 0.0) {
 118                         text = "-∞";
 119                 } else {
 120                         // Should never happen, really.
 121                         text = "∞";
 122                 }
 123         }
 124         if (!(flags & DB_BARE)) {
 125                 text += " dB";
 126         }
 127         return text;
 128 }
 129
 130 void set_peak_label(QLabel *peak_label, float peak_db)
 131 {
 132         peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 133
 134         // -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
 135         // (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
 136         if (peak_db > -0.1f) {
 137                 peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
 138         } else {
 139                 peak_label->setStyleSheet("");
 140         }
 141 }
 142
 143 }  // namespace
 144
 145 MainWindow::MainWindow()
 146         : ui(new Ui::MainWindow)
 147 {
 148         global_mainwindow = this;
 149         ui->setupUi(this);
 150
 151         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 152         disk_free_label = new QLabel(this);
 153         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 154         ui->menuBar->setCornerWidget(disk_free_label);
 155
 156         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 157         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 158
 159         // The menus.
 160         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 161         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 162         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 163         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 164
 165         if (global_flags.x264_video_to_http) {
 166                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 167         } else {
 168                 ui->x264_bitrate_action->setEnabled(false);
 169         }
 170
 171         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 172         // TODO: Make them dynamic.
 173         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 174         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 175         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 176
 177         // Aiee...
 178         transition_btn1 = ui->transition_btn1;
 179         transition_btn2 = ui->transition_btn2;
 180         transition_btn3 = ui->transition_btn3;
 181         qRegisterMetaType<string>("std::string");
 182         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 183         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 184         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 185
 186         // Hook up the prev/next buttons on the audio views.
 187         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 188         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 189         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 190         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 191
 192         last_audio_level_callback = steady_clock::now() - seconds(1);
 193 }
 194
 195 void MainWindow::resizeEvent(QResizeEvent* event)
 196 {
 197         QMainWindow::resizeEvent(event);
 198
 199         // Ask for a relayout, but only after the event loop is done doing relayout
 200         // on everything else.
 201         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 202 }
 203
 204 void MainWindow::mixer_created(Mixer *mixer)
 205 {
 206         // Make the previews.
 207         unsigned num_previews = mixer->get_num_channels();
 208
 209         for (unsigned i = 0; i < num_previews; ++i) {
 210                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 211
 212                 QWidget *preview = new QWidget(this);
 213                 Ui::Display *ui_display = new Ui::Display;
 214                 ui_display->setupUi(preview);
 215                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 216                 ui_display->display->set_output(output);
 217                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 218                 previews.push_back(ui_display);
 219
 220                 // Hook up the click.
 221                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 222
 223                 // Let the theme update the text whenever the resolution or color changed.
 224                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 225                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 226
 227                 // Hook up the keyboard key.
 228                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 229                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 230
 231                 // Hook up the white balance button (irrelevant if invisible).
 232                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 233                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 234         }
 235
 236         setup_audio_miniview();
 237         setup_audio_expanded_view();
 238
 239         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 240         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 241         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 242         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 243         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 244
 245         // TODO: Fetch all of the values these for completeness,
 246         // not just the enable knobs implied by flags.
 247 #if 0
 248         // TODO: Reenable for simple audio.
 249         ui->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled(0));
 250         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 251                 global_mixer->get_audio_mixer()->set_locut_enabled(0, state == Qt::Checked);
 252         });
 253         ui->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db());
 254         ui->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto());
 255         ui->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled());
 256         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged, this, &MainWindow::gain_staging_knob_changed);
 257         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 258                 global_mixer->get_audio_mixer()->set_gain_staging_auto(state == Qt::Checked);
 259         });
 260         ui->compressor_threshold_db_display->setText(
 261                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(), DB_WITH_SIGN)));
 262         ui->compressor_threshold_db_display->setText(buf);
 263         connect(ui->compressor_threshold_knob, &QDial::valueChanged, this, &MainWindow::compressor_threshold_knob_changed);
 264         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 265                 global_mixer->get_audio_mixer()->set_compressor_enabled(state == Qt::Checked);
 266         });
 267 #else
 268         ui->locut_enabled->setVisible(false);
 269         ui->gainstaging_label->setVisible(false);
 270         ui->gainstaging_knob->setVisible(false);
 271         ui->gainstaging_db_display->setVisible(false);
 272         ui->gainstaging_auto_checkbox->setVisible(false);
 273         ui->compressor_threshold_label->setVisible(false);
 274         ui->compressor_threshold_knob->setVisible(false);
 275         ui->compressor_threshold_db_display->setVisible(false);
 276         ui->compressor_enabled->setVisible(false);
 277 #endif
 278         ui->limiter_enabled->setChecked(global_mixer->get_audio_mixer()->get_limiter_enabled());
 279         ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_final_makeup_gain_auto());
 280
 281         QString limiter_threshold_label(
 282                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 283         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 284         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 285
 286         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 287         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 288
 289         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 290         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 291                 global_mixer->get_audio_mixer()->set_final_makeup_gain_auto(state == Qt::Checked);
 292         });
 293
 294         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 295         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 296                 global_mixer->get_audio_mixer()->set_limiter_enabled(state == Qt::Checked);
 297         });
 298         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 299         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
 300
 301         struct sigaction act;
 302         memset(&act, 0, sizeof(act));
 303         act.sa_handler = schedule_cut_signal;
 304         act.sa_flags = SA_RESTART;
 305         sigaction(SIGHUP, &act, nullptr);
 306
 307         // Mostly for debugging. Don't override SIGINT, that's so evil if
 308         // shutdown isn't instant.
 309         memset(&act, 0, sizeof(act));
 310         act.sa_handler = quit_signal;
 311         act.sa_flags = SA_RESTART;
 312         sigaction(SIGUSR1, &act, nullptr);
 313 }
 314
 315 void MainWindow::setup_audio_miniview()
 316 {
 317         // Remove any existing channels.
 318         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 319                 delete item->widget();
 320                 delete item;
 321         }
 322         audio_miniviews.clear();
 323
 324         // Set up brand new ones from the input mapping.
 325         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 326         audio_miniviews.resize(mapping.buses.size());
 327         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 328                 QWidget *channel = new QWidget(this);
 329                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 330                 ui_audio_miniview->setupUi(channel);
 331                 ui_audio_miniview->bus_desc_label->setFullText(
 332                         QString::fromStdString(mapping.buses[bus_index].name));
 333                 audio_miniviews[bus_index] = ui_audio_miniview;
 334
 335                 // Set up the peak meter.
 336                 VUMeter *peak_meter = ui_audio_miniview->peak_meter;
 337                 peak_meter->set_min_level(-30.0f);
 338                 peak_meter->set_max_level(0.0f);
 339                 peak_meter->set_ref_level(0.0f);
 340
 341                 // TODO: Set the fader position.
 342                 ui->faders->addWidget(channel);
 343
 344                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 345                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 346                 connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
 347                         [bus_index]() {
 348                                 global_mixer->get_audio_mixer()->reset_peak(bus_index);
 349                         });
 350         }
 351 }
 352
 353 void MainWindow::setup_audio_expanded_view()
 354 {
 355         // Remove any existing channels.
 356         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 357                 delete item->widget();
 358                 delete item;
 359         }
 360         audio_expanded_views.clear();
 361
 362         // Set up brand new ones from the input mapping.
 363         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 364         audio_expanded_views.resize(mapping.buses.size());
 365         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 366                 QWidget *channel = new QWidget(this);
 367                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 368                 ui_audio_expanded_view->setupUi(channel);
 369                 ui_audio_expanded_view->bus_desc_label->setFullText(
 370                         QString::fromStdString(mapping.buses[bus_index].name));
 371                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 372                 update_eq_label(bus_index, EQ_BAND_TREBLE, global_mixer->get_audio_mixer()->get_eq(bus_index, EQ_BAND_TREBLE));
 373                 update_eq_label(bus_index, EQ_BAND_MID, global_mixer->get_audio_mixer()->get_eq(bus_index, EQ_BAND_MID));
 374                 update_eq_label(bus_index, EQ_BAND_BASS, global_mixer->get_audio_mixer()->get_eq(bus_index, EQ_BAND_BASS));
 375                 // TODO: Set the fader position.
 376                 ui->buses->addWidget(channel);
 377
 378                 ui_audio_expanded_view->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled(bus_index));
 379                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 380                         global_mixer->get_audio_mixer()->set_locut_enabled(bus_index, state == Qt::Checked);
 381                 });
 382
 383                 connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
 384                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
 385                 connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
 386                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
 387                 connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
 388                         bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
 389
 390                 ui_audio_expanded_view->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db(bus_index));
 391                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto(bus_index));
 392                 ui_audio_expanded_view->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled(bus_index));
 393
 394                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 395                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 396                         global_mixer->get_audio_mixer()->set_gain_staging_auto(bus_index, state == Qt::Checked);
 397                 });
 398
 399                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 400                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 401                         global_mixer->get_audio_mixer()->set_compressor_enabled(bus_index, state == Qt::Checked);
 402                 });
 403
 404                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 405
 406                 // Set up the peak meter.
 407                 VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
 408                 peak_meter->set_min_level(-30.0f);
 409                 peak_meter->set_max_level(0.0f);
 410                 peak_meter->set_ref_level(0.0f);
 411
 412                 connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
 413                         [bus_index]() {
 414                                 global_mixer->get_audio_mixer()->reset_peak(bus_index);
 415                         });
 416
 417                 // Set up the compression attenuation meter.
 418                 VUMeter *reduction_meter = ui_audio_expanded_view->reduction_meter;
 419                 reduction_meter->set_min_level(0.0f);
 420                 reduction_meter->set_max_level(10.0f);
 421                 reduction_meter->set_ref_level(0.0f);
 422                 reduction_meter->set_flip(true);
 423         }
 424 }
 425
 426 void MainWindow::mixer_shutting_down()
 427 {
 428         ui->me_live->clean_context();
 429         ui->me_preview->clean_context();
 430         for (Ui::Display *display : previews) {
 431                 display->display->clean_context();
 432         }
 433 }
 434
 435 void MainWindow::cut_triggered()
 436 {
 437         global_mixer->schedule_cut();
 438 }
 439
 440 void MainWindow::x264_bitrate_triggered()
 441 {
 442         bool ok;
 443         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);
 444         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 445                 global_flags.x264_bitrate = new_bitrate;
 446                 global_mixer->change_x264_bitrate(new_bitrate);
 447         }
 448 }
 449
 450 void MainWindow::exit_triggered()
 451 {
 452         close();
 453 }
 454
 455 void MainWindow::about_triggered()
 456 {
 457         AboutDialog().exec();
 458 }
 459
 460 void MainWindow::input_mapping_triggered()
 461 {
 462         if (InputMappingDialog().exec() == QDialog::Accepted) {
 463                 setup_audio_miniview();
 464                 setup_audio_expanded_view();
 465         }
 466 }
 467
 468 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 469 {
 470         if (bus_index == 0) {
 471                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 472         }
 473         if (bus_index < audio_expanded_views.size()) {
 474                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 475         }
 476
 477         float gain_db = value * 0.1f;
 478         global_mixer->get_audio_mixer()->set_gain_staging_db(bus_index, gain_db);
 479
 480         // The label will be updated by the audio level callback.
 481 }
 482
 483 void MainWindow::final_makeup_gain_knob_changed(int value)
 484 {
 485         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 486
 487         float gain_db = value * 0.1f;
 488         global_mixer->get_audio_mixer()->set_final_makeup_gain_db(gain_db);
 489
 490         // The label will be updated by the audio level callback.
 491 }
 492
 493 void MainWindow::cutoff_knob_changed(int value)
 494 {
 495         float octaves = value * 0.1f;
 496         float cutoff_hz = 20.0 * pow(2.0, octaves);
 497         global_mixer->get_audio_mixer()->set_locut_cutoff(cutoff_hz);
 498
 499         char buf[256];
 500         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 501         ui->locut_cutoff_display->setText(buf);
 502         ui->locut_cutoff_display_2->setText(buf);
 503
 504         for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
 505                 audio_expanded_views[bus_index]->locut_enabled->setText(
 506                         QString("Lo-cut: ") + buf);
 507         }
 508 }
 509
 510 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 511 {
 512         char time_str[256];
 513         if (estimated_seconds_left < 60.0) {
 514                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 515         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 516                 int s = lrintf(estimated_seconds_left);
 517                 int m = s / 60;
 518                 s %= 60;
 519                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 520         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 521                 int m = lrintf(estimated_seconds_left / 60.0);
 522                 snprintf(time_str, sizeof(time_str), "%dm", m);
 523         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 524                 int m = lrintf(estimated_seconds_left / 60.0);
 525                 int h = m / 60;
 526                 m %= 60;
 527                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 528         } else {  // More than ten hours: Xh.
 529                 int h = lrintf(estimated_seconds_left / 3600.0);
 530                 snprintf(time_str, sizeof(time_str), "%dh", h);
 531         }
 532         char buf[256];
 533         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 534
 535         std::string label = buf;
 536
 537         post_to_main_thread([this, label]{
 538                 disk_free_label->setText(QString::fromStdString(label));
 539                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 540         });
 541 }
 542
 543 void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
 544 {
 545         float gain_db = value * 0.1f;
 546         global_mixer->get_audio_mixer()->set_eq(bus_index, band, gain_db);
 547
 548         update_eq_label(bus_index, band, gain_db);
 549 }
 550
 551 void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
 552 {
 553         Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 554         string db_string = format_db(gain_db, DB_WITH_SIGN);
 555         switch (band) {
 556         case EQ_BAND_TREBLE:
 557                 view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
 558                 break;
 559         case EQ_BAND_MID:
 560                 view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
 561                 break;
 562         case EQ_BAND_BASS:
 563                 view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
 564                 break;
 565         default:
 566                 assert(false);
 567         }
 568 }
 569
 570 void MainWindow::limiter_threshold_knob_changed(int value)
 571 {
 572         float threshold_dbfs = value * 0.1f;
 573         global_mixer->get_audio_mixer()->set_limiter_threshold_dbfs(threshold_dbfs);
 574         ui->limiter_threshold_db_display->setText(
 575                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 576         ui->limiter_threshold_db_display_2->setText(
 577                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 578 }
 579
 580 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 581 {
 582         float threshold_dbfs = value * 0.1f;
 583         global_mixer->get_audio_mixer()->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 584
 585         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 586         if (bus_index == 0) {
 587                 ui->compressor_threshold_db_display->setText(label);
 588         }
 589         if (bus_index < audio_expanded_views.size()) {
 590                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 591         }
 592 }
 593
 594 void MainWindow::mini_fader_changed(int bus, double volume_db)
 595 {
 596         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 597         audio_miniviews[bus]->fader_label->setText(label);
 598         audio_expanded_views[bus]->fader_label->setText(label);
 599
 600         global_mixer->get_audio_mixer()->set_fader_volume(bus, volume_db);
 601 }
 602
 603 void MainWindow::reset_meters_button_clicked()
 604 {
 605         global_mixer->get_audio_mixer()->reset_meters();
 606         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 607         ui->peak_display->setStyleSheet("");
 608 }
 609
 610 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
 611                                       float global_level_lufs,
 612                                       float range_low_lufs, float range_high_lufs,
 613                                       float final_makeup_gain_db,
 614                                       float correlation)
 615 {
 616         steady_clock::time_point now = steady_clock::now();
 617
 618         // The meters are somewhat inefficient to update. Only update them
 619         // every 100 ms or so (we get updates every 5–20 ms). Note that this
 620         // means that the digital peak meters are ever so slightly too low
 621         // (each update won't be a faithful representation of the highest peak
 622         // since the previous update, since there are frames we won't draw),
 623         // but the _peak_ of the peak meters will be correct (it's tracked in
 624         // AudioMixer, not here), and that's much more important.
 625         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 626         if (last_update_age < 0.100) {
 627                 return;
 628         }
 629         last_audio_level_callback = now;
 630
 631         post_to_main_thread([=]() {
 632                 ui->vu_meter->set_level(level_lufs);
 633                 for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
 634                         if (bus_index < audio_miniviews.size()) {
 635                                 const AudioMixer::BusLevel &level = bus_levels[bus_index];
 636                                 Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
 637                                 miniview->peak_meter->set_level(
 638                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 639                                 miniview->peak_meter->set_peak(
 640                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 641                                 set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
 642
 643                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 644                                 view->peak_meter->set_level(
 645                                         level.current_level_dbfs[0], level.current_level_dbfs[1]);
 646                                 view->peak_meter->set_peak(
 647                                         level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
 648                                 view->reduction_meter->set_level(level.compressor_attenuation_db);
 649                                 view->gainstaging_knob->blockSignals(true);
 650                                 view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
 651                                 view->gainstaging_knob->blockSignals(false);
 652                                 view->gainstaging_db_display->setText(
 653                                         QString("Gain: ") +
 654                                         QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
 655                                 set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
 656                         }
 657                 }
 658                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 659                 ui->correlation_meter->set_correlation(correlation);
 660
 661                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 662                 set_peak_label(ui->peak_display, peak_db);
 663
 664                 // NOTE: Will be invisible when using multitrack audio.
 665                 ui->gainstaging_knob->blockSignals(true);
 666                 ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
 667                 ui->gainstaging_knob->blockSignals(false);
 668                 ui->gainstaging_db_display->setText(
 669                         QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 670
 671                 ui->makeup_gain_knob->blockSignals(true);
 672                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 673                 ui->makeup_gain_knob->blockSignals(false);
 674                 ui->makeup_gain_db_display->setText(
 675                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 676                 ui->makeup_gain_db_display_2->setText(
 677                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 678         });
 679 }
 680
 681 void MainWindow::relayout()
 682 {
 683         int height = ui->vertical_layout->geometry().height();
 684
 685         double remaining_height = height;
 686
 687         // Allocate the height; the most important part is to keep the main displays
 688         // at 16:9 if at all possible.
 689         double me_width = ui->me_preview->width();
 690         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 691
 692         // TODO: Scale the widths when we need to do this.
 693         if (me_height / double(height) > 0.8) {
 694                 me_height = height * 0.8;
 695         }
 696         remaining_height -= me_height + ui->vertical_layout->spacing();
 697
 698         // Space between the M/E displays and the audio strip.
 699         remaining_height -= ui->vertical_layout->spacing();
 700
 701         // The label above the audio strip.
 702         double compact_label_height = ui->compact_label->geometry().height() +
 703                 ui->compact_audio_layout->spacing();
 704         remaining_height -= compact_label_height;
 705
 706         // The previews will be constrained by the remaining height, and the width.
 707         double preview_label_height = previews[0]->title_bar->geometry().height() +
 708                 previews[0]->main_vertical_layout->spacing();
 709         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 710         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 711         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 712
 713         ui->vertical_layout->setStretch(0, lrintf(me_height));
 714         ui->vertical_layout->setStretch(1,
 715                 lrintf(compact_label_height) +
 716                 lrintf(remaining_height) +
 717                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 718
 719         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 720         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 721         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 722
 723         // Set the widths for the previews.
 724         double preview_width = preview_height * 16.0 / 9.0;
 725         for (unsigned i = 0; i < previews.size(); ++i) {
 726                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 727         }
 728
 729         // The preview horizontal spacer.
 730         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 731         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 732 }
 733
 734 void MainWindow::set_transition_names(vector<string> transition_names)
 735 {
 736         if (transition_names.size() < 1 || transition_names[0].empty()) {
 737                 transition_btn1->setText(QString(""));
 738         } else {
 739                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
 740                 ui->transition_btn1->setShortcut(QKeySequence("J"));
 741         }
 742         if (transition_names.size() < 2 || transition_names[1].empty()) {
 743                 transition_btn2->setText(QString(""));
 744         } else {
 745                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
 746                 ui->transition_btn2->setShortcut(QKeySequence("K"));
 747         }
 748         if (transition_names.size() < 3 || transition_names[2].empty()) {
 749                 transition_btn3->setText(QString(""));
 750         } else {
 751                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
 752                 ui->transition_btn3->setShortcut(QKeySequence("L"));
 753         }
 754 }
 755
 756 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
 757 {
 758         if (output >= Mixer::OUTPUT_INPUT0) {
 759                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 760                 previews[channel]->label->setText(name.c_str());
 761         }
 762 }
 763
 764 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
 765 {
 766         if (output >= Mixer::OUTPUT_INPUT0) {
 767                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 768                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
 769         }
 770 }
 771
 772 void MainWindow::transition_clicked(int transition_number)
 773 {
 774         global_mixer->transition_clicked(transition_number);
 775 }
 776
 777 void MainWindow::channel_clicked(int channel_number)
 778 {
 779         if (current_wb_pick_display == channel_number) {
 780                 // The picking was already done from eventFilter(), since we don't get
 781                 // the mouse pointer here.
 782         } else {
 783                 global_mixer->channel_clicked(channel_number);
 784         }
 785 }
 786
 787 void MainWindow::wb_button_clicked(int channel_number)
 788 {
 789         current_wb_pick_display = channel_number;
 790         QApplication::setOverrideCursor(Qt::CrossCursor);
 791 }
 792
 793 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 794 {
 795         if (current_wb_pick_display != -1 &&
 796             event->type() == QEvent::MouseButtonRelease &&
 797             watched->isWidgetType()) {
 798                 QApplication::restoreOverrideCursor();
 799                 if (watched == previews[current_wb_pick_display]->display) {
 800                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
 801                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
 802                 } else {
 803                         // The user clicked on something else, give up.
 804                         // (The click goes through, which might not be ideal, but, yes.)
 805                         current_wb_pick_display = -1;
 806                 }
 807         }
 808         return false;
 809 }
 810
 811 namespace {
 812
 813 double srgb_to_linear(double x)
 814 {
 815         if (x < 0.04045) {
 816                 return x / 12.92;
 817         } else {
 818                 return pow((x + 0.055) / 1.055, 2.4);
 819         }
 820 }
 821
 822 }  // namespace
 823
 824 void MainWindow::set_white_balance(int channel_number, int x, int y)
 825 {
 826         // Set the white balance to neutral for the grab. It's probably going to
 827         // flicker a bit, but hopefully this display is not live anyway.
 828         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
 829         previews[channel_number]->display->updateGL();
 830         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
 831
 832         double r = srgb_to_linear(qRed(reference_color) / 255.0);
 833         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
 834         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
 835         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
 836         previews[channel_number]->display->updateGL();
 837 }