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 constexpr unsigned DB_NO_FLAGS = 0x0;
  83 constexpr unsigned DB_WITH_SIGN = 0x1;
  84 constexpr unsigned DB_BARE = 0x2;
  85
  86 string format_db(double db, unsigned flags)
  87 {
  88         string text;
  89         if (flags & DB_WITH_SIGN) {
  90                 if (isfinite(db)) {
  91                         char buf[256];
  92                         snprintf(buf, sizeof(buf), "%+.1f", db);
  93                         text = buf;
  94                 } else if (db < 0.0) {
  95                         text = "-∞";
  96                 } else {
  97                         // Should never happen, really.
  98                         text = "+∞";
  99                 }
 100         } else {
 101                 if (isfinite(db)) {
 102                         char buf[256];
 103                         snprintf(buf, sizeof(buf), "%.1f", db);
 104                         text = buf;
 105                 } else if (db < 0.0) {
 106                         text = "-∞";
 107                 } else {
 108                         // Should never happen, really.
 109                         text = "∞";
 110                 }
 111         }
 112         if (!(flags & DB_BARE)) {
 113                 text += " dB";
 114         }
 115         return text;
 116 }
 117
 118 }  // namespace
 119
 120 MainWindow::MainWindow()
 121         : ui(new Ui::MainWindow)
 122 {
 123         global_mainwindow = this;
 124         ui->setupUi(this);
 125
 126         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 127         disk_free_label = new QLabel(this);
 128         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 129         ui->menuBar->setCornerWidget(disk_free_label);
 130
 131         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 132         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 133
 134         // The menus.
 135         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 136         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 137         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 138         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 139
 140         if (global_flags.x264_video_to_http) {
 141                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 142         } else {
 143                 ui->x264_bitrate_action->setEnabled(false);
 144         }
 145
 146         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 147         // TODO: Make them dynamic.
 148         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 149         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 150         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 151
 152         // Aiee...
 153         transition_btn1 = ui->transition_btn1;
 154         transition_btn2 = ui->transition_btn2;
 155         transition_btn3 = ui->transition_btn3;
 156         qRegisterMetaType<string>("std::string");
 157         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 158         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 159         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 160
 161         // Hook up the prev/next buttons on the audio views.
 162         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 163         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 164         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 165         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 166
 167         last_audio_level_callback = steady_clock::now() - seconds(1);
 168 }
 169
 170 void MainWindow::resizeEvent(QResizeEvent* event)
 171 {
 172         QMainWindow::resizeEvent(event);
 173
 174         // Ask for a relayout, but only after the event loop is done doing relayout
 175         // on everything else.
 176         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 177 }
 178
 179 void MainWindow::mixer_created(Mixer *mixer)
 180 {
 181         // Make the previews.
 182         unsigned num_previews = mixer->get_num_channels();
 183
 184         for (unsigned i = 0; i < num_previews; ++i) {
 185                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 186
 187                 QWidget *preview = new QWidget(this);
 188                 Ui::Display *ui_display = new Ui::Display;
 189                 ui_display->setupUi(preview);
 190                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 191                 ui_display->display->set_output(output);
 192                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 193                 previews.push_back(ui_display);
 194
 195                 // Hook up the click.
 196                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 197
 198                 // Let the theme update the text whenever the resolution or color changed.
 199                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 200                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 201
 202                 // Hook up the keyboard key.
 203                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 204                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 205
 206                 // Hook up the white balance button (irrelevant if invisible).
 207                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 208                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 209         }
 210
 211         setup_audio_miniview();
 212         setup_audio_expanded_view();
 213
 214         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 215         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 216         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 217         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 218         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 219
 220         // TODO: Fetch all of the values these for completeness,
 221         // not just the enable knobs implied by flags.
 222         ui->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled());
 223         ui->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db());
 224         ui->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto());
 225         ui->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled());
 226         ui->limiter_enabled->setChecked(global_mixer->get_audio_mixer()->get_limiter_enabled());
 227         ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_final_makeup_gain_auto());
 228
 229         QString limiter_threshold_label(
 230                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 231         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 232         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 233         ui->compressor_threshold_db_display->setText(
 234                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(), DB_WITH_SIGN)));
 235
 236         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 237         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 238         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 239                 global_mixer->get_audio_mixer()->set_locut_enabled(state == Qt::Checked);
 240         });
 241
 242         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged, this, &MainWindow::gain_staging_knob_changed);
 243         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 244                 global_mixer->get_audio_mixer()->set_gain_staging_auto(state == Qt::Checked);
 245         });
 246         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 247         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 248                 global_mixer->get_audio_mixer()->set_final_makeup_gain_auto(state == Qt::Checked);
 249         });
 250
 251         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 252         connect(ui->compressor_threshold_knob, &QDial::valueChanged, this, &MainWindow::compressor_threshold_knob_changed);
 253         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 254                 global_mixer->get_audio_mixer()->set_limiter_enabled(state == Qt::Checked);
 255         });
 256         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 257                 global_mixer->get_audio_mixer()->set_compressor_enabled(state == Qt::Checked);
 258         });
 259         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 260         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8, _9));
 261
 262         struct sigaction act;
 263         memset(&act, 0, sizeof(act));
 264         act.sa_handler = schedule_cut_signal;
 265         act.sa_flags = SA_RESTART;
 266         sigaction(SIGHUP, &act, nullptr);
 267
 268         // Mostly for debugging. Don't override SIGINT, that's so evil if
 269         // shutdown isn't instant.
 270         memset(&act, 0, sizeof(act));
 271         act.sa_handler = quit_signal;
 272         act.sa_flags = SA_RESTART;
 273         sigaction(SIGUSR1, &act, nullptr);
 274 }
 275
 276 void MainWindow::setup_audio_miniview()
 277 {
 278         // Remove any existing channels.
 279         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 280                 delete item->widget();
 281                 delete item;
 282         }
 283         audio_miniviews.clear();
 284
 285         // Set up brand new ones from the input mapping.
 286         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 287         audio_miniviews.resize(mapping.buses.size());
 288         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 289                 QWidget *channel = new QWidget(this);
 290                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 291                 ui_audio_miniview->setupUi(channel);
 292                 ui_audio_miniview->bus_desc_label->setFullText(
 293                         QString::fromStdString(mapping.buses[bus_index].name));
 294                 audio_miniviews[bus_index] = ui_audio_miniview;
 295                 // TODO: Set the fader position.
 296                 ui->faders->addWidget(channel);
 297
 298                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 299                         bind(&MainWindow::mini_fader_changed, this, ui_audio_miniview, bus_index, _1));
 300         }
 301 }
 302
 303 void MainWindow::setup_audio_expanded_view()
 304 {
 305         // Remove any existing channels.
 306         for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
 307                 delete item->widget();
 308                 delete item;
 309         }
 310         audio_expanded_views.clear();
 311
 312         // Set up brand new ones from the input mapping.
 313         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 314         audio_expanded_views.resize(mapping.buses.size());
 315         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 316                 QWidget *channel = new QWidget(this);
 317                 Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
 318                 ui_audio_expanded_view->setupUi(channel);
 319                 ui_audio_expanded_view->bus_desc_label->setFullText(
 320                         QString::fromStdString(mapping.buses[bus_index].name));
 321                 audio_expanded_views[bus_index] = ui_audio_expanded_view;
 322                 // TODO: Set the fader position.
 323                 ui->buses->addWidget(channel);
 324
 325                 //connect(ui_audio_expanded_view->fader, &NonLinearFader::dbValueChanged,
 326                 //      bind(&MainWindow::mini_fader_changed, this, ui_audio_expanded_view, bus_index, _1));
 327         }
 328 }
 329
 330 void MainWindow::mixer_shutting_down()
 331 {
 332         ui->me_live->clean_context();
 333         ui->me_preview->clean_context();
 334         for (Ui::Display *display : previews) {
 335                 display->display->clean_context();
 336         }
 337 }
 338
 339 void MainWindow::cut_triggered()
 340 {
 341         global_mixer->schedule_cut();
 342 }
 343
 344 void MainWindow::x264_bitrate_triggered()
 345 {
 346         bool ok;
 347         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);
 348         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 349                 global_flags.x264_bitrate = new_bitrate;
 350                 global_mixer->change_x264_bitrate(new_bitrate);
 351         }
 352 }
 353
 354 void MainWindow::exit_triggered()
 355 {
 356         close();
 357 }
 358
 359 void MainWindow::about_triggered()
 360 {
 361         AboutDialog().exec();
 362 }
 363
 364 void MainWindow::input_mapping_triggered()
 365 {
 366         if (InputMappingDialog().exec() == QDialog::Accepted) {
 367                 setup_audio_miniview();
 368                 setup_audio_expanded_view();
 369         }
 370 }
 371
 372 void MainWindow::gain_staging_knob_changed(int value)
 373 {
 374         ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 375
 376         float gain_db = value * 0.1f;
 377         global_mixer->get_audio_mixer()->set_gain_staging_db(gain_db);
 378
 379         // The label will be updated by the audio level callback.
 380 }
 381
 382 void MainWindow::final_makeup_gain_knob_changed(int value)
 383 {
 384         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 385
 386         float gain_db = value * 0.1f;
 387         global_mixer->get_audio_mixer()->set_final_makeup_gain_db(gain_db);
 388
 389         // The label will be updated by the audio level callback.
 390 }
 391
 392 void MainWindow::cutoff_knob_changed(int value)
 393 {
 394         float octaves = value * 0.1f;
 395         float cutoff_hz = 20.0 * pow(2.0, octaves);
 396         global_mixer->get_audio_mixer()->set_locut_cutoff(cutoff_hz);
 397
 398         char buf[256];
 399         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 400         ui->locut_cutoff_display->setText(buf);
 401         ui->locut_cutoff_display_2->setText(buf);
 402 }
 403
 404 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 405 {
 406         char time_str[256];
 407         if (estimated_seconds_left < 60.0) {
 408                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 409         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 410                 int s = lrintf(estimated_seconds_left);
 411                 int m = s / 60;
 412                 s %= 60;
 413                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 414         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 415                 int m = lrintf(estimated_seconds_left / 60.0);
 416                 snprintf(time_str, sizeof(time_str), "%dm", m);
 417         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 418                 int m = lrintf(estimated_seconds_left / 60.0);
 419                 int h = m / 60;
 420                 m %= 60;
 421                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 422         } else {  // More than ten hours: Xh.
 423                 int h = lrintf(estimated_seconds_left / 3600.0);
 424                 snprintf(time_str, sizeof(time_str), "%dh", h);
 425         }
 426         char buf[256];
 427         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 428
 429         std::string label = buf;
 430
 431         post_to_main_thread([this, label]{
 432                 disk_free_label->setText(QString::fromStdString(label));
 433                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 434         });
 435 }
 436
 437 void MainWindow::limiter_threshold_knob_changed(int value)
 438 {
 439         float threshold_dbfs = value * 0.1f;
 440         global_mixer->get_audio_mixer()->set_limiter_threshold_dbfs(threshold_dbfs);
 441         ui->limiter_threshold_db_display->setText(
 442                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 443         ui->limiter_threshold_db_display_2->setText(
 444                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 445 }
 446
 447 void MainWindow::compressor_threshold_knob_changed(int value)
 448 {
 449         float threshold_dbfs = value * 0.1f;
 450         global_mixer->get_audio_mixer()->set_compressor_threshold_dbfs(threshold_dbfs);
 451         ui->compressor_threshold_db_display->setText(
 452                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 453 }
 454
 455 void MainWindow::mini_fader_changed(Ui::AudioMiniView *ui, int channel, double volume_db)
 456 {
 457         char buf[256];
 458         if (isfinite(volume_db)) {
 459                 snprintf(buf, sizeof(buf), "%+.1f dB", volume_db);
 460                 ui->fader_label->setText(buf);
 461         } else {
 462                 ui->fader_label->setText("-∞ dB");
 463         }
 464
 465         global_mixer->get_audio_mixer()->set_fader_volume(channel, volume_db);
 466 }
 467
 468 void MainWindow::reset_meters_button_clicked()
 469 {
 470         global_mixer->get_audio_mixer()->reset_meters();
 471         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 472         ui->peak_display->setStyleSheet("");
 473 }
 474
 475 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<float> bus_level_lufs,
 476                                       float global_level_lufs,
 477                                       float range_low_lufs, float range_high_lufs,
 478                                       float gain_staging_db, float final_makeup_gain_db,
 479                                       float correlation)
 480 {
 481         steady_clock::time_point now = steady_clock::now();
 482
 483         // The meters are somewhat inefficient to update. Only update them
 484         // every 100 ms or so (we get updates every 5–20 ms).
 485         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 486         if (last_update_age < 0.100) {
 487                 return;
 488         }
 489         last_audio_level_callback = now;
 490
 491         post_to_main_thread([=]() {
 492                 ui->vu_meter->set_level(level_lufs);
 493                 for (unsigned bus_index = 0; bus_index < bus_level_lufs.size(); ++bus_index) {
 494                         if (bus_index < audio_miniviews.size()) {
 495                                 audio_miniviews[bus_index]->vu_meter_meter->set_level(
 496                                         bus_level_lufs[bus_index]);
 497                         }
 498                 }
 499                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 500                 ui->correlation_meter->set_correlation(correlation);
 501
 502                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 503                 if (peak_db > -0.1f) {  // -0.1 dBFS is EBU peak limit.
 504                         ui->peak_display->setStyleSheet("QLabel { background-color: red; color: white; }");
 505                 } else {
 506                         ui->peak_display->setStyleSheet("");
 507                 }
 508
 509                 ui->gainstaging_knob->blockSignals(true);
 510                 ui->gainstaging_knob->setValue(lrintf(gain_staging_db * 10.0f));
 511                 ui->gainstaging_knob->blockSignals(false);
 512                 ui->gainstaging_db_display->setText(
 513                         QString::fromStdString(format_db(gain_staging_db, DB_WITH_SIGN)));
 514
 515                 ui->makeup_gain_knob->blockSignals(true);
 516                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 517                 ui->makeup_gain_knob->blockSignals(false);
 518                 ui->makeup_gain_db_display->setText(
 519                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 520                 ui->makeup_gain_db_display_2->setText(
 521                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 522         });
 523 }
 524
 525 void MainWindow::relayout()
 526 {
 527         int height = ui->vertical_layout->geometry().height();
 528
 529         double remaining_height = height;
 530
 531         // Allocate the height; the most important part is to keep the main displays
 532         // at 16:9 if at all possible.
 533         double me_width = ui->me_preview->width();
 534         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 535
 536         // TODO: Scale the widths when we need to do this.
 537         if (me_height / double(height) > 0.8) {
 538                 me_height = height * 0.8;
 539         }
 540         remaining_height -= me_height + ui->vertical_layout->spacing();
 541
 542         // Space between the M/E displays and the audio strip.
 543         remaining_height -= ui->vertical_layout->spacing();
 544
 545         // The label above the audio strip.
 546         double compact_label_height = ui->compact_label->geometry().height() +
 547                 ui->compact_audio_layout->spacing();
 548         remaining_height -= compact_label_height;
 549
 550         // The previews will be constrained by the remaining height, and the width.
 551         double preview_label_height = previews[0]->title_bar->geometry().height() +
 552                 previews[0]->main_vertical_layout->spacing();
 553         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 554         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 555         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 556
 557         ui->vertical_layout->setStretch(0, lrintf(me_height));
 558         ui->vertical_layout->setStretch(1,
 559                 lrintf(compact_label_height) +
 560                 lrintf(remaining_height) +
 561                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 562
 563         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 564         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 565         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 566
 567         // Set the widths for the previews.
 568         double preview_width = preview_height * 16.0 / 9.0;
 569         for (unsigned i = 0; i < previews.size(); ++i) {
 570                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 571         }
 572
 573         // The preview horizontal spacer.
 574         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 575         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 576 }
 577
 578 void MainWindow::set_transition_names(vector<string> transition_names)
 579 {
 580         if (transition_names.size() < 1 || transition_names[0].empty()) {
 581                 transition_btn1->setText(QString(""));
 582         } else {
 583                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
 584                 ui->transition_btn1->setShortcut(QKeySequence("J"));
 585         }
 586         if (transition_names.size() < 2 || transition_names[1].empty()) {
 587                 transition_btn2->setText(QString(""));
 588         } else {
 589                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
 590                 ui->transition_btn2->setShortcut(QKeySequence("K"));
 591         }
 592         if (transition_names.size() < 3 || transition_names[2].empty()) {
 593                 transition_btn3->setText(QString(""));
 594         } else {
 595                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
 596                 ui->transition_btn3->setShortcut(QKeySequence("L"));
 597         }
 598 }
 599
 600 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
 601 {
 602         if (output >= Mixer::OUTPUT_INPUT0) {
 603                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 604                 previews[channel]->label->setText(name.c_str());
 605         }
 606 }
 607
 608 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
 609 {
 610         if (output >= Mixer::OUTPUT_INPUT0) {
 611                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 612                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
 613         }
 614 }
 615
 616 void MainWindow::transition_clicked(int transition_number)
 617 {
 618         global_mixer->transition_clicked(transition_number);
 619 }
 620
 621 void MainWindow::channel_clicked(int channel_number)
 622 {
 623         if (current_wb_pick_display == channel_number) {
 624                 // The picking was already done from eventFilter(), since we don't get
 625                 // the mouse pointer here.
 626         } else {
 627                 global_mixer->channel_clicked(channel_number);
 628         }
 629 }
 630
 631 void MainWindow::wb_button_clicked(int channel_number)
 632 {
 633         current_wb_pick_display = channel_number;
 634         QApplication::setOverrideCursor(Qt::CrossCursor);
 635 }
 636
 637 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 638 {
 639         if (current_wb_pick_display != -1 &&
 640             event->type() == QEvent::MouseButtonRelease &&
 641             watched->isWidgetType()) {
 642                 QApplication::restoreOverrideCursor();
 643                 if (watched == previews[current_wb_pick_display]->display) {
 644                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
 645                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
 646                 } else {
 647                         // The user clicked on something else, give up.
 648                         // (The click goes through, which might not be ideal, but, yes.)
 649                         current_wb_pick_display = -1;
 650                 }
 651         }
 652         return false;
 653 }
 654
 655 namespace {
 656
 657 double srgb_to_linear(double x)
 658 {
 659         if (x < 0.04045) {
 660                 return x / 12.92;
 661         } else {
 662                 return pow((x + 0.055) / 1.055, 2.4);
 663         }
 664 }
 665
 666 }  // namespace
 667
 668 void MainWindow::set_white_balance(int channel_number, int x, int y)
 669 {
 670         // Set the white balance to neutral for the grab. It's probably going to
 671         // flicker a bit, but hopefully this display is not live anyway.
 672         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
 673         previews[channel_number]->display->updateGL();
 674         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
 675
 676         double r = srgb_to_linear(qRed(reference_color) / 255.0);
 677         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
 678         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
 679         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
 680         previews[channel_number]->display->updateGL();
 681 }