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 }  // namespace
 131
 132 MainWindow::MainWindow()
 133         : ui(new Ui::MainWindow)
 134 {
 135         global_mainwindow = this;
 136         ui->setupUi(this);
 137
 138         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 139         disk_free_label = new QLabel(this);
 140         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 141         ui->menuBar->setCornerWidget(disk_free_label);
 142
 143         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 144         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 145
 146         // The menus.
 147         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 148         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 149         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 150         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 151
 152         if (global_flags.x264_video_to_http) {
 153                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 154         } else {
 155                 ui->x264_bitrate_action->setEnabled(false);
 156         }
 157
 158         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 159         // TODO: Make them dynamic.
 160         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 161         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 162         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 163
 164         // Aiee...
 165         transition_btn1 = ui->transition_btn1;
 166         transition_btn2 = ui->transition_btn2;
 167         transition_btn3 = ui->transition_btn3;
 168         qRegisterMetaType<string>("std::string");
 169         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 170         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 171         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 172
 173         // Hook up the prev/next buttons on the audio views.
 174         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 175         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 176         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 177         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 178
 179         last_audio_level_callback = steady_clock::now() - seconds(1);
 180 }
 181
 182 void MainWindow::resizeEvent(QResizeEvent* event)
 183 {
 184         QMainWindow::resizeEvent(event);
 185
 186         // Ask for a relayout, but only after the event loop is done doing relayout
 187         // on everything else.
 188         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 189 }
 190
 191 void MainWindow::mixer_created(Mixer *mixer)
 192 {
 193         // Make the previews.
 194         unsigned num_previews = mixer->get_num_channels();
 195
 196         for (unsigned i = 0; i < num_previews; ++i) {
 197                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 198
 199                 QWidget *preview = new QWidget(this);
 200                 Ui::Display *ui_display = new Ui::Display;
 201                 ui_display->setupUi(preview);
 202                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 203                 ui_display->display->set_output(output);
 204                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 205                 previews.push_back(ui_display);
 206
 207                 // Hook up the click.
 208                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 209
 210                 // Let the theme update the text whenever the resolution or color changed.
 211                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 212                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 213
 214                 // Hook up the keyboard key.
 215                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 216                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 217
 218                 // Hook up the white balance button (irrelevant if invisible).
 219                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 220                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 221         }
 222
 223         setup_audio_miniview();
 224         setup_audio_expanded_view();
 225
 226         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 227         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 228         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 229         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 230         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 231
 232         // TODO: Fetch all of the values these for completeness,
 233         // not just the enable knobs implied by flags.
 234 #if 0
 235         // TODO: Reenable for simple audio.
 236         ui->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled(0));
 237         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 238                 global_mixer->get_audio_mixer()->set_locut_enabled(0, state == Qt::Checked);
 239         });
 240         ui->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db());
 241         ui->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto());
 242         ui->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled());
 243         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged, this, &MainWindow::gain_staging_knob_changed);
 244         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 245                 global_mixer->get_audio_mixer()->set_gain_staging_auto(state == Qt::Checked);
 246         });
 247         ui->compressor_threshold_db_display->setText(
 248                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(), DB_WITH_SIGN)));
 249         ui->compressor_threshold_db_display->setText(buf);
 250         connect(ui->compressor_threshold_knob, &QDial::valueChanged, this, &MainWindow::compressor_threshold_knob_changed);
 251         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 252                 global_mixer->get_audio_mixer()->set_compressor_enabled(state == Qt::Checked);
 253         });
 254 #else
 255         ui->locut_enabled->setVisible(false);
 256         ui->gainstaging_label->setVisible(false);
 257         ui->gainstaging_knob->setVisible(false);
 258         ui->gainstaging_db_display->setVisible(false);
 259         ui->gainstaging_auto_checkbox->setVisible(false);
 260         ui->compressor_threshold_label->setVisible(false);
 261         ui->compressor_threshold_knob->setVisible(false);
 262         ui->compressor_threshold_db_display->setVisible(false);
 263         ui->compressor_enabled->setVisible(false);
 264 #endif
 265         ui->limiter_enabled->setChecked(global_mixer->get_audio_mixer()->get_limiter_enabled());
 266         ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_final_makeup_gain_auto());
 267
 268         QString limiter_threshold_label(
 269                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 270         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 271         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 272
 273         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 274         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 275
 276         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 277         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 278                 global_mixer->get_audio_mixer()->set_final_makeup_gain_auto(state == Qt::Checked);
 279         });
 280
 281         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 282         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 283                 global_mixer->get_audio_mixer()->set_limiter_enabled(state == Qt::Checked);
 284         });
 285         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 286         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8, _9));
 287
 288         struct sigaction act;
 289         memset(&act, 0, sizeof(act));
 290         act.sa_handler = schedule_cut_signal;
 291         act.sa_flags = SA_RESTART;
 292         sigaction(SIGHUP, &act, nullptr);
 293
 294         // Mostly for debugging. Don't override SIGINT, that's so evil if
 295         // shutdown isn't instant.
 296         memset(&act, 0, sizeof(act));
 297         act.sa_handler = quit_signal;
 298         act.sa_flags = SA_RESTART;
 299         sigaction(SIGUSR1, &act, nullptr);
 300 }
 301
 302 void MainWindow::setup_audio_miniview()
 303 {
 304         // Remove any existing channels.
 305         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 306                 delete item->widget();
 307                 delete item;
 308         }
 309         audio_miniviews.clear();
 310
 311         // Set up brand new ones from the input mapping.
 312         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 313         audio_miniviews.resize(mapping.buses.size());
 314         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 315                 QWidget *channel = new QWidget(this);
 316                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 317                 ui_audio_miniview->setupUi(channel);
 318                 ui_audio_miniview->bus_desc_label->setFullText(
 319                         QString::fromStdString(mapping.buses[bus_index].name));
 320                 audio_miniviews[bus_index] = ui_audio_miniview;
 321                 // TODO: Set the fader position.
 322                 ui->faders->addWidget(channel);
 323
 324                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 325                         bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
 326         }
 327 }
 328
 329 void MainWindow::setup_audio_expanded_view()
 330 {
 331         // Remove any existing channels.
 332         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 333                 delete item->widget();
 334                 delete item;
 335         }
 336         audio_expanded_views.clear();
 337
 338         // Set up brand new ones from the input mapping.
 339         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 340         audio_expanded_views.resize(mapping.buses.size());
 341         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 342                 QWidget *channel = new QWidget(this);
 343                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 344                 ui_audio_expanded_view->setupUi(channel);
 345                 ui_audio_expanded_view->bus_desc_label->setFullText(
 346                         QString::fromStdString(mapping.buses[bus_index].name));
 347                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 348                 // TODO: Set the fader position.
 349                 ui->buses->addWidget(channel);
 350
 351                 ui_audio_expanded_view->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled(bus_index));
 352                 connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 353                         global_mixer->get_audio_mixer()->set_locut_enabled(bus_index, state == Qt::Checked);
 354                 });
 355
 356                 ui_audio_expanded_view->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db(bus_index));
 357                 ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto(bus_index));
 358                 ui_audio_expanded_view->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled(bus_index));
 359
 360                 connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
 361                 connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
 362                         global_mixer->get_audio_mixer()->set_gain_staging_auto(bus_index, state == Qt::Checked);
 363                 });
 364
 365                 connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
 366                 connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
 367                         global_mixer->get_audio_mixer()->set_compressor_enabled(bus_index, state == Qt::Checked);
 368                 });
 369
 370                 slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
 371         }
 372 }
 373
 374 void MainWindow::mixer_shutting_down()
 375 {
 376         ui->me_live->clean_context();
 377         ui->me_preview->clean_context();
 378         for (Ui::Display *display : previews) {
 379                 display->display->clean_context();
 380         }
 381 }
 382
 383 void MainWindow::cut_triggered()
 384 {
 385         global_mixer->schedule_cut();
 386 }
 387
 388 void MainWindow::x264_bitrate_triggered()
 389 {
 390         bool ok;
 391         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);
 392         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 393                 global_flags.x264_bitrate = new_bitrate;
 394                 global_mixer->change_x264_bitrate(new_bitrate);
 395         }
 396 }
 397
 398 void MainWindow::exit_triggered()
 399 {
 400         close();
 401 }
 402
 403 void MainWindow::about_triggered()
 404 {
 405         AboutDialog().exec();
 406 }
 407
 408 void MainWindow::input_mapping_triggered()
 409 {
 410         if (InputMappingDialog().exec() == QDialog::Accepted) {
 411                 setup_audio_miniview();
 412                 setup_audio_expanded_view();
 413         }
 414 }
 415
 416 void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
 417 {
 418         if (bus_index == 0) {
 419                 ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 420         }
 421         if (bus_index < audio_expanded_views.size()) {
 422                 audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 423         }
 424
 425         float gain_db = value * 0.1f;
 426         global_mixer->get_audio_mixer()->set_gain_staging_db(bus_index, gain_db);
 427
 428         // The label will be updated by the audio level callback.
 429 }
 430
 431 void MainWindow::final_makeup_gain_knob_changed(int value)
 432 {
 433         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 434
 435         float gain_db = value * 0.1f;
 436         global_mixer->get_audio_mixer()->set_final_makeup_gain_db(gain_db);
 437
 438         // The label will be updated by the audio level callback.
 439 }
 440
 441 void MainWindow::cutoff_knob_changed(int value)
 442 {
 443         float octaves = value * 0.1f;
 444         float cutoff_hz = 20.0 * pow(2.0, octaves);
 445         global_mixer->get_audio_mixer()->set_locut_cutoff(cutoff_hz);
 446
 447         char buf[256];
 448         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 449         ui->locut_cutoff_display->setText(buf);
 450         ui->locut_cutoff_display_2->setText(buf);
 451 }
 452
 453 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 454 {
 455         char time_str[256];
 456         if (estimated_seconds_left < 60.0) {
 457                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 458         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 459                 int s = lrintf(estimated_seconds_left);
 460                 int m = s / 60;
 461                 s %= 60;
 462                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 463         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 464                 int m = lrintf(estimated_seconds_left / 60.0);
 465                 snprintf(time_str, sizeof(time_str), "%dm", m);
 466         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 467                 int m = lrintf(estimated_seconds_left / 60.0);
 468                 int h = m / 60;
 469                 m %= 60;
 470                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 471         } else {  // More than ten hours: Xh.
 472                 int h = lrintf(estimated_seconds_left / 3600.0);
 473                 snprintf(time_str, sizeof(time_str), "%dh", h);
 474         }
 475         char buf[256];
 476         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 477
 478         std::string label = buf;
 479
 480         post_to_main_thread([this, label]{
 481                 disk_free_label->setText(QString::fromStdString(label));
 482                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 483         });
 484 }
 485
 486 void MainWindow::limiter_threshold_knob_changed(int value)
 487 {
 488         float threshold_dbfs = value * 0.1f;
 489         global_mixer->get_audio_mixer()->set_limiter_threshold_dbfs(threshold_dbfs);
 490         ui->limiter_threshold_db_display->setText(
 491                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 492         ui->limiter_threshold_db_display_2->setText(
 493                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 494 }
 495
 496 void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 497 {
 498         float threshold_dbfs = value * 0.1f;
 499         global_mixer->get_audio_mixer()->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 500
 501         QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 502         if (bus_index == 0) {
 503                 ui->compressor_threshold_db_display->setText(label);
 504         }
 505         if (bus_index < audio_expanded_views.size()) {
 506                 audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
 507         }
 508 }
 509
 510 void MainWindow::mini_fader_changed(int bus, double volume_db)
 511 {
 512         QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
 513         audio_miniviews[bus]->fader_label->setText(label);
 514         audio_expanded_views[bus]->fader_label->setText(label);
 515
 516         global_mixer->get_audio_mixer()->set_fader_volume(bus, volume_db);
 517 }
 518
 519 void MainWindow::reset_meters_button_clicked()
 520 {
 521         global_mixer->get_audio_mixer()->reset_meters();
 522         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 523         ui->peak_display->setStyleSheet("");
 524 }
 525
 526 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<float> bus_level_lufs,
 527                                       float global_level_lufs,
 528                                       float range_low_lufs, float range_high_lufs,
 529                                       vector<float> gain_staging_db, float final_makeup_gain_db,
 530                                       float correlation)
 531 {
 532         steady_clock::time_point now = steady_clock::now();
 533
 534         // The meters are somewhat inefficient to update. Only update them
 535         // every 100 ms or so (we get updates every 5–20 ms).
 536         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 537         if (last_update_age < 0.100) {
 538                 return;
 539         }
 540         last_audio_level_callback = now;
 541
 542         post_to_main_thread([=]() {
 543                 ui->vu_meter->set_level(level_lufs);
 544                 for (unsigned bus_index = 0; bus_index < bus_level_lufs.size(); ++bus_index) {
 545                         if (bus_index < audio_miniviews.size()) {
 546                                 audio_miniviews[bus_index]->vu_meter_meter->set_level(
 547                                         bus_level_lufs[bus_index]);
 548
 549                                 Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
 550                                 view->vu_meter_meter->set_level(bus_level_lufs[bus_index]);
 551                                 view->gainstaging_knob->blockSignals(true);
 552                                 view->gainstaging_knob->setValue(lrintf(gain_staging_db[bus_index] * 10.0f));
 553                                 view->gainstaging_knob->blockSignals(false);
 554                                 view->gainstaging_db_display->setText(
 555                                         QString("Gain: ") +
 556                                         QString::fromStdString(format_db(gain_staging_db[bus_index], DB_WITH_SIGN)));
 557                         }
 558                 }
 559                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 560                 ui->correlation_meter->set_correlation(correlation);
 561
 562                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 563                 if (peak_db > -0.1f) {  // -0.1 dBFS is EBU peak limit.
 564                         ui->peak_display->setStyleSheet("QLabel { background-color: red; color: white; }");
 565                 } else {
 566                         ui->peak_display->setStyleSheet("");
 567                 }
 568
 569                 // NOTE: Will be invisible when using multitrack audio.
 570                 ui->gainstaging_knob->blockSignals(true);
 571                 ui->gainstaging_knob->setValue(lrintf(gain_staging_db[0] * 10.0f));
 572                 ui->gainstaging_knob->blockSignals(false);
 573                 ui->gainstaging_db_display->setText(
 574                         QString::fromStdString(format_db(gain_staging_db[0], DB_WITH_SIGN)));
 575
 576                 ui->makeup_gain_knob->blockSignals(true);
 577                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 578                 ui->makeup_gain_knob->blockSignals(false);
 579                 ui->makeup_gain_db_display->setText(
 580                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 581                 ui->makeup_gain_db_display_2->setText(
 582                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 583         });
 584 }
 585
 586 void MainWindow::relayout()
 587 {
 588         int height = ui->vertical_layout->geometry().height();
 589
 590         double remaining_height = height;
 591
 592         // Allocate the height; the most important part is to keep the main displays
 593         // at 16:9 if at all possible.
 594         double me_width = ui->me_preview->width();
 595         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 596
 597         // TODO: Scale the widths when we need to do this.
 598         if (me_height / double(height) > 0.8) {
 599                 me_height = height * 0.8;
 600         }
 601         remaining_height -= me_height + ui->vertical_layout->spacing();
 602
 603         // Space between the M/E displays and the audio strip.
 604         remaining_height -= ui->vertical_layout->spacing();
 605
 606         // The label above the audio strip.
 607         double compact_label_height = ui->compact_label->geometry().height() +
 608                 ui->compact_audio_layout->spacing();
 609         remaining_height -= compact_label_height;
 610
 611         // The previews will be constrained by the remaining height, and the width.
 612         double preview_label_height = previews[0]->title_bar->geometry().height() +
 613                 previews[0]->main_vertical_layout->spacing();
 614         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 615         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 616         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 617
 618         ui->vertical_layout->setStretch(0, lrintf(me_height));
 619         ui->vertical_layout->setStretch(1,
 620                 lrintf(compact_label_height) +
 621                 lrintf(remaining_height) +
 622                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 623
 624         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 625         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 626         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 627
 628         // Set the widths for the previews.
 629         double preview_width = preview_height * 16.0 / 9.0;
 630         for (unsigned i = 0; i < previews.size(); ++i) {
 631                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 632         }
 633
 634         // The preview horizontal spacer.
 635         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 636         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 637 }
 638
 639 void MainWindow::set_transition_names(vector<string> transition_names)
 640 {
 641         if (transition_names.size() < 1 || transition_names[0].empty()) {
 642                 transition_btn1->setText(QString(""));
 643         } else {
 644                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
 645                 ui->transition_btn1->setShortcut(QKeySequence("J"));
 646         }
 647         if (transition_names.size() < 2 || transition_names[1].empty()) {
 648                 transition_btn2->setText(QString(""));
 649         } else {
 650                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
 651                 ui->transition_btn2->setShortcut(QKeySequence("K"));
 652         }
 653         if (transition_names.size() < 3 || transition_names[2].empty()) {
 654                 transition_btn3->setText(QString(""));
 655         } else {
 656                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
 657                 ui->transition_btn3->setShortcut(QKeySequence("L"));
 658         }
 659 }
 660
 661 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
 662 {
 663         if (output >= Mixer::OUTPUT_INPUT0) {
 664                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 665                 previews[channel]->label->setText(name.c_str());
 666         }
 667 }
 668
 669 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
 670 {
 671         if (output >= Mixer::OUTPUT_INPUT0) {
 672                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 673                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
 674         }
 675 }
 676
 677 void MainWindow::transition_clicked(int transition_number)
 678 {
 679         global_mixer->transition_clicked(transition_number);
 680 }
 681
 682 void MainWindow::channel_clicked(int channel_number)
 683 {
 684         if (current_wb_pick_display == channel_number) {
 685                 // The picking was already done from eventFilter(), since we don't get
 686                 // the mouse pointer here.
 687         } else {
 688                 global_mixer->channel_clicked(channel_number);
 689         }
 690 }
 691
 692 void MainWindow::wb_button_clicked(int channel_number)
 693 {
 694         current_wb_pick_display = channel_number;
 695         QApplication::setOverrideCursor(Qt::CrossCursor);
 696 }
 697
 698 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 699 {
 700         if (current_wb_pick_display != -1 &&
 701             event->type() == QEvent::MouseButtonRelease &&
 702             watched->isWidgetType()) {
 703                 QApplication::restoreOverrideCursor();
 704                 if (watched == previews[current_wb_pick_display]->display) {
 705                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
 706                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
 707                 } else {
 708                         // The user clicked on something else, give up.
 709                         // (The click goes through, which might not be ideal, but, yes.)
 710                         current_wb_pick_display = -1;
 711                 }
 712         }
 713         return false;
 714 }
 715
 716 namespace {
 717
 718 double srgb_to_linear(double x)
 719 {
 720         if (x < 0.04045) {
 721                 return x / 12.92;
 722         } else {
 723                 return pow((x + 0.055) / 1.055, 2.4);
 724         }
 725 }
 726
 727 }  // namespace
 728
 729 void MainWindow::set_white_balance(int channel_number, int x, int y)
 730 {
 731         // Set the white balance to neutral for the grab. It's probably going to
 732         // flicker a bit, but hopefully this display is not live anyway.
 733         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
 734         previews[channel_number]->display->updateGL();
 735         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
 736
 737         double r = srgb_to_linear(qRed(reference_color) / 255.0);
 738         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
 739         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
 740         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
 741         previews[channel_number]->display->updateGL();
 742 }