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_display.h"
  31 #include "ui_mainwindow.h"
  32 #include "vumeter.h"
  33
  34 class QResizeEvent;
  35
  36 using namespace std;
  37 using namespace std::chrono;
  38 using namespace std::placeholders;
  39
  40 Q_DECLARE_METATYPE(std::string);
  41 Q_DECLARE_METATYPE(std::vector<std::string>);
  42
  43 MainWindow *global_mainwindow = nullptr;
  44
  45 namespace {
  46
  47 void schedule_cut_signal(int ignored)
  48 {
  49         global_mixer->schedule_cut();
  50 }
  51
  52 void quit_signal(int ignored)
  53 {
  54         global_mainwindow->close();
  55 }
  56
  57 void slave_knob(QDial *master, QDial *slave)
  58 {
  59         QWidget::connect(master, &QDial::valueChanged, [slave](int value){
  60                 slave->blockSignals(true);
  61                 slave->setValue(value);
  62                 slave->blockSignals(false);
  63         });
  64         QWidget::connect(slave, &QDial::valueChanged, [master](int value){
  65                 master->setValue(value);
  66         });
  67 }
  68
  69 void slave_checkbox(QCheckBox *master, QCheckBox *slave)
  70 {
  71         QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
  72                 slave->blockSignals(true);
  73                 slave->setCheckState(Qt::CheckState(state));
  74                 slave->blockSignals(false);
  75         });
  76         QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
  77                 master->setCheckState(Qt::CheckState(state));
  78         });
  79 }
  80
  81 constexpr unsigned DB_NO_FLAGS = 0x0;
  82 constexpr unsigned DB_WITH_SIGN = 0x1;
  83 constexpr unsigned DB_BARE = 0x2;
  84
  85 string format_db(double db, unsigned flags)
  86 {
  87         string text;
  88         if (flags & DB_WITH_SIGN) {
  89                 if (isfinite(db)) {
  90                         char buf[256];
  91                         snprintf(buf, sizeof(buf), "%+.1f", db);
  92                         text = buf;
  93                 } else if (db < 0.0) {
  94                         text = "-∞";
  95                 } else {
  96                         // Should never happen, really.
  97                         text = "+∞";
  98                 }
  99         } else {
 100                 if (isfinite(db)) {
 101                         char buf[256];
 102                         snprintf(buf, sizeof(buf), "%.1f", db);
 103                         text = buf;
 104                 } else if (db < 0.0) {
 105                         text = "-∞";
 106                 } else {
 107                         // Should never happen, really.
 108                         text = "∞";
 109                 }
 110         }
 111         if (!(flags & DB_BARE)) {
 112                 text += " dB";
 113         }
 114         return text;
 115 }
 116
 117 }  // namespace
 118
 119 MainWindow::MainWindow()
 120         : ui(new Ui::MainWindow)
 121 {
 122         global_mainwindow = this;
 123         ui->setupUi(this);
 124
 125         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
 126         disk_free_label = new QLabel(this);
 127         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
 128         ui->menuBar->setCornerWidget(disk_free_label);
 129
 130         ui->me_live->set_output(Mixer::OUTPUT_LIVE);
 131         ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 132
 133         // The menus.
 134         connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
 135         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
 136         connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
 137         connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
 138
 139         if (global_flags.x264_video_to_http) {
 140                 connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
 141         } else {
 142                 ui->x264_bitrate_action->setEnabled(false);
 143         }
 144
 145         // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
 146         // TODO: Make them dynamic.
 147         connect(ui->transition_btn1, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 0));
 148         connect(ui->transition_btn2, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 1));
 149         connect(ui->transition_btn3, &QPushButton::clicked, bind(&MainWindow::transition_clicked, this, 2));
 150
 151         // Aiee...
 152         transition_btn1 = ui->transition_btn1;
 153         transition_btn2 = ui->transition_btn2;
 154         transition_btn3 = ui->transition_btn3;
 155         qRegisterMetaType<string>("std::string");
 156         qRegisterMetaType<vector<string>>("std::vector<std::string>");
 157         connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
 158         qRegisterMetaType<Mixer::Output>("Mixer::Output");
 159
 160         // Hook up the prev/next buttons on the audio views.
 161         connect(ui->compact_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 162         connect(ui->compact_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 1));
 163         connect(ui->full_prev_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 164         connect(ui->full_next_page, &QAbstractButton::clicked, bind(&QStackedWidget::setCurrentIndex, ui->audio_views, 0));
 165
 166         last_audio_level_callback = steady_clock::now() - seconds(1);
 167 }
 168
 169 void MainWindow::resizeEvent(QResizeEvent* event)
 170 {
 171         QMainWindow::resizeEvent(event);
 172
 173         // Ask for a relayout, but only after the event loop is done doing relayout
 174         // on everything else.
 175         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 176 }
 177
 178 void MainWindow::mixer_created(Mixer *mixer)
 179 {
 180         // Make the previews.
 181         unsigned num_previews = mixer->get_num_channels();
 182
 183         for (unsigned i = 0; i < num_previews; ++i) {
 184                 Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 185
 186                 QWidget *preview = new QWidget(this);
 187                 Ui::Display *ui_display = new Ui::Display;
 188                 ui_display->setupUi(preview);
 189                 ui_display->label->setText(mixer->get_channel_name(output).c_str());
 190                 ui_display->display->set_output(output);
 191                 ui->preview_displays->insertWidget(previews.size(), preview, 1);
 192                 previews.push_back(ui_display);
 193
 194                 // Hook up the click.
 195                 connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
 196
 197                 // Let the theme update the text whenever the resolution or color changed.
 198                 connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
 199                 connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
 200
 201                 // Hook up the keyboard key.
 202                 QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
 203                 connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 204
 205                 // Hook up the white balance button (irrelevant if invisible).
 206                 ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
 207                 connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
 208         }
 209
 210         setup_audio_miniview();
 211
 212         slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
 213         slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
 214         slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
 215         slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
 216         slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
 217
 218         // TODO: Fetch all of the values these for completeness,
 219         // not just the enable knobs implied by flags.
 220         ui->locut_enabled->setChecked(global_mixer->get_audio_mixer()->get_locut_enabled());
 221         ui->gainstaging_knob->setValue(global_mixer->get_audio_mixer()->get_gain_staging_db());
 222         ui->gainstaging_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_gain_staging_auto());
 223         ui->compressor_enabled->setChecked(global_mixer->get_audio_mixer()->get_compressor_enabled());
 224         ui->limiter_enabled->setChecked(global_mixer->get_audio_mixer()->get_limiter_enabled());
 225         ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_audio_mixer()->get_final_makeup_gain_auto());
 226
 227         QString limiter_threshold_label(
 228                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
 229         ui->limiter_threshold_db_display->setText(limiter_threshold_label);
 230         ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 231         ui->compressor_threshold_db_display->setText(
 232                 QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(), DB_WITH_SIGN)));
 233
 234         connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
 235         cutoff_knob_changed(ui->locut_cutoff_knob->value());
 236         connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
 237                 global_mixer->get_audio_mixer()->set_locut_enabled(state == Qt::Checked);
 238         });
 239
 240         connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged, this, &MainWindow::gain_staging_knob_changed);
 241         connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 242                 global_mixer->get_audio_mixer()->set_gain_staging_auto(state == Qt::Checked);
 243         });
 244         connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
 245         connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
 246                 global_mixer->get_audio_mixer()->set_final_makeup_gain_auto(state == Qt::Checked);
 247         });
 248
 249         connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
 250         connect(ui->compressor_threshold_knob, &QDial::valueChanged, this, &MainWindow::compressor_threshold_knob_changed);
 251         connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
 252                 global_mixer->get_audio_mixer()->set_limiter_enabled(state == Qt::Checked);
 253         });
 254         connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
 255                 global_mixer->get_audio_mixer()->set_compressor_enabled(state == Qt::Checked);
 256         });
 257         connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
 258         mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8, _9));
 259
 260         struct sigaction act;
 261         memset(&act, 0, sizeof(act));
 262         act.sa_handler = schedule_cut_signal;
 263         act.sa_flags = SA_RESTART;
 264         sigaction(SIGHUP, &act, nullptr);
 265
 266         // Mostly for debugging. Don't override SIGINT, that's so evil if
 267         // shutdown isn't instant.
 268         memset(&act, 0, sizeof(act));
 269         act.sa_handler = quit_signal;
 270         act.sa_flags = SA_RESTART;
 271         sigaction(SIGUSR1, &act, nullptr);
 272 }
 273
 274 void MainWindow::setup_audio_miniview()
 275 {
 276         // Remove any existing channels.
 277         for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
 278                 delete item->widget();
 279                 delete item;
 280         }
 281         audio_miniviews.clear();
 282
 283         // Set up brand new ones from the input mapping.
 284         InputMapping mapping = global_mixer->get_audio_mixer()->get_input_mapping();
 285         audio_miniviews.resize(mapping.buses.size());
 286         for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
 287                 QWidget *channel = new QWidget(this);
 288                 Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
 289                 ui_audio_miniview->setupUi(channel);
 290                 ui_audio_miniview->bus_desc_label->setFullText(
 291                         QString::fromStdString(mapping.buses[bus_index].name));
 292                 audio_miniviews[bus_index] = ui_audio_miniview;
 293                 // TODO: Set the fader position.
 294                 ui->faders->addWidget(channel);
 295
 296                 connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
 297                         bind(&MainWindow::mini_fader_changed, this, ui_audio_miniview, bus_index, _1));
 298         }
 299 }
 300
 301 void MainWindow::mixer_shutting_down()
 302 {
 303         ui->me_live->clean_context();
 304         ui->me_preview->clean_context();
 305         for (Ui::Display *display : previews) {
 306                 display->display->clean_context();
 307         }
 308 }
 309
 310 void MainWindow::cut_triggered()
 311 {
 312         global_mixer->schedule_cut();
 313 }
 314
 315 void MainWindow::x264_bitrate_triggered()
 316 {
 317         bool ok;
 318         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);
 319         if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
 320                 global_flags.x264_bitrate = new_bitrate;
 321                 global_mixer->change_x264_bitrate(new_bitrate);
 322         }
 323 }
 324
 325 void MainWindow::exit_triggered()
 326 {
 327         close();
 328 }
 329
 330 void MainWindow::about_triggered()
 331 {
 332         AboutDialog().exec();
 333 }
 334
 335 void MainWindow::input_mapping_triggered()
 336 {
 337         if (InputMappingDialog().exec() == QDialog::Accepted) {
 338                 setup_audio_miniview();
 339         }
 340 }
 341
 342 void MainWindow::gain_staging_knob_changed(int value)
 343 {
 344         ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
 345
 346         float gain_db = value * 0.1f;
 347         global_mixer->get_audio_mixer()->set_gain_staging_db(gain_db);
 348
 349         // The label will be updated by the audio level callback.
 350 }
 351
 352 void MainWindow::final_makeup_gain_knob_changed(int value)
 353 {
 354         ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
 355
 356         float gain_db = value * 0.1f;
 357         global_mixer->get_audio_mixer()->set_final_makeup_gain_db(gain_db);
 358
 359         // The label will be updated by the audio level callback.
 360 }
 361
 362 void MainWindow::cutoff_knob_changed(int value)
 363 {
 364         float octaves = value * 0.1f;
 365         float cutoff_hz = 20.0 * pow(2.0, octaves);
 366         global_mixer->get_audio_mixer()->set_locut_cutoff(cutoff_hz);
 367
 368         char buf[256];
 369         snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
 370         ui->locut_cutoff_display->setText(buf);
 371         ui->locut_cutoff_display_2->setText(buf);
 372 }
 373
 374 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 375 {
 376         char time_str[256];
 377         if (estimated_seconds_left < 60.0) {
 378                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 379         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 380                 int s = lrintf(estimated_seconds_left);
 381                 int m = s / 60;
 382                 s %= 60;
 383                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 384         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 385                 int m = lrintf(estimated_seconds_left / 60.0);
 386                 snprintf(time_str, sizeof(time_str), "%dm", m);
 387         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 388                 int m = lrintf(estimated_seconds_left / 60.0);
 389                 int h = m / 60;
 390                 m %= 60;
 391                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 392         } else {  // More than ten hours: Xh.
 393                 int h = lrintf(estimated_seconds_left / 3600.0);
 394                 snprintf(time_str, sizeof(time_str), "%dh", h);
 395         }
 396         char buf[256];
 397         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 398
 399         std::string label = buf;
 400
 401         post_to_main_thread([this, label]{
 402                 disk_free_label->setText(QString::fromStdString(label));
 403                 ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 404         });
 405 }
 406
 407 void MainWindow::limiter_threshold_knob_changed(int value)
 408 {
 409         float threshold_dbfs = value * 0.1f;
 410         global_mixer->get_audio_mixer()->set_limiter_threshold_dbfs(threshold_dbfs);
 411         ui->limiter_threshold_db_display->setText(
 412                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 413         ui->limiter_threshold_db_display_2->setText(
 414                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 415 }
 416
 417 void MainWindow::compressor_threshold_knob_changed(int value)
 418 {
 419         float threshold_dbfs = value * 0.1f;
 420         global_mixer->get_audio_mixer()->set_compressor_threshold_dbfs(threshold_dbfs);
 421         ui->compressor_threshold_db_display->setText(
 422                 QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 423 }
 424
 425 void MainWindow::mini_fader_changed(Ui::AudioMiniView *ui, int channel, double volume_db)
 426 {
 427         char buf[256];
 428         if (isfinite(volume_db)) {
 429                 snprintf(buf, sizeof(buf), "%+.1f dB", volume_db);
 430                 ui->fader_label->setText(buf);
 431         } else {
 432                 ui->fader_label->setText("-∞ dB");
 433         }
 434
 435         global_mixer->get_audio_mixer()->set_fader_volume(channel, volume_db);
 436 }
 437
 438 void MainWindow::reset_meters_button_clicked()
 439 {
 440         global_mixer->get_audio_mixer()->reset_meters();
 441         ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
 442         ui->peak_display->setStyleSheet("");
 443 }
 444
 445 void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<float> bus_level_lufs,
 446                                       float global_level_lufs,
 447                                       float range_low_lufs, float range_high_lufs,
 448                                       float gain_staging_db, float final_makeup_gain_db,
 449                                       float correlation)
 450 {
 451         steady_clock::time_point now = steady_clock::now();
 452
 453         // The meters are somewhat inefficient to update. Only update them
 454         // every 100 ms or so (we get updates every 5–20 ms).
 455         double last_update_age = duration<double>(now - last_audio_level_callback).count();
 456         if (last_update_age < 0.100) {
 457                 return;
 458         }
 459         last_audio_level_callback = now;
 460
 461         post_to_main_thread([=]() {
 462                 ui->vu_meter->set_level(level_lufs);
 463                 for (unsigned bus_index = 0; bus_index < bus_level_lufs.size(); ++bus_index) {
 464                         if (bus_index < audio_miniviews.size()) {
 465                                 audio_miniviews[bus_index]->vu_meter_meter->set_level(
 466                                         bus_level_lufs[bus_index]);
 467                         }
 468                 }
 469                 ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
 470                 ui->correlation_meter->set_correlation(correlation);
 471
 472                 ui->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
 473                 if (peak_db > -0.1f) {  // -0.1 dBFS is EBU peak limit.
 474                         ui->peak_display->setStyleSheet("QLabel { background-color: red; color: white; }");
 475                 } else {
 476                         ui->peak_display->setStyleSheet("");
 477                 }
 478
 479                 ui->gainstaging_knob->blockSignals(true);
 480                 ui->gainstaging_knob->setValue(lrintf(gain_staging_db * 10.0f));
 481                 ui->gainstaging_knob->blockSignals(false);
 482                 ui->gainstaging_db_display->setText(
 483                         QString::fromStdString(format_db(gain_staging_db, DB_WITH_SIGN)));
 484
 485                 ui->makeup_gain_knob->blockSignals(true);
 486                 ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
 487                 ui->makeup_gain_knob->blockSignals(false);
 488                 ui->makeup_gain_db_display->setText(
 489                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 490                 ui->makeup_gain_db_display_2->setText(
 491                         QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
 492         });
 493 }
 494
 495 void MainWindow::relayout()
 496 {
 497         int height = ui->vertical_layout->geometry().height();
 498
 499         double remaining_height = height;
 500
 501         // Allocate the height; the most important part is to keep the main displays
 502         // at 16:9 if at all possible.
 503         double me_width = ui->me_preview->width();
 504         double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 505
 506         // TODO: Scale the widths when we need to do this.
 507         if (me_height / double(height) > 0.8) {
 508                 me_height = height * 0.8;
 509         }
 510         remaining_height -= me_height + ui->vertical_layout->spacing();
 511
 512         // Space between the M/E displays and the audio strip.
 513         remaining_height -= ui->vertical_layout->spacing();
 514
 515         // The label above the audio strip.
 516         double compact_label_height = ui->compact_label->geometry().height() +
 517                 ui->compact_audio_layout->spacing();
 518         remaining_height -= compact_label_height;
 519
 520         // The previews will be constrained by the remaining height, and the width.
 521         double preview_label_height = previews[0]->title_bar->geometry().height() +
 522                 previews[0]->main_vertical_layout->spacing();
 523         int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
 524         double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
 525         remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 526
 527         ui->vertical_layout->setStretch(0, lrintf(me_height));
 528         ui->vertical_layout->setStretch(1,
 529                 lrintf(compact_label_height) +
 530                 lrintf(remaining_height) +
 531                 lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
 532
 533         ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
 534         ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
 535         ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
 536
 537         // Set the widths for the previews.
 538         double preview_width = preview_height * 16.0 / 9.0;
 539         for (unsigned i = 0; i < previews.size(); ++i) {
 540                 ui->preview_displays->setStretch(i, lrintf(preview_width));
 541         }
 542
 543         // The preview horizontal spacer.
 544         double remaining_preview_width = preview_total_width - previews.size() * preview_width;
 545         ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
 546 }
 547
 548 void MainWindow::set_transition_names(vector<string> transition_names)
 549 {
 550         if (transition_names.size() < 1 || transition_names[0].empty()) {
 551                 transition_btn1->setText(QString(""));
 552         } else {
 553                 transition_btn1->setText(QString::fromStdString(transition_names[0] + " (J)"));
 554                 ui->transition_btn1->setShortcut(QKeySequence("J"));
 555         }
 556         if (transition_names.size() < 2 || transition_names[1].empty()) {
 557                 transition_btn2->setText(QString(""));
 558         } else {
 559                 transition_btn2->setText(QString::fromStdString(transition_names[1] + " (K)"));
 560                 ui->transition_btn2->setShortcut(QKeySequence("K"));
 561         }
 562         if (transition_names.size() < 3 || transition_names[2].empty()) {
 563                 transition_btn3->setText(QString(""));
 564         } else {
 565                 transition_btn3->setText(QString::fromStdString(transition_names[2] + " (L)"));
 566                 ui->transition_btn3->setShortcut(QKeySequence("L"));
 567         }
 568 }
 569
 570 void MainWindow::update_channel_name(Mixer::Output output, const string &name)
 571 {
 572         if (output >= Mixer::OUTPUT_INPUT0) {
 573                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 574                 previews[channel]->label->setText(name.c_str());
 575         }
 576 }
 577
 578 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
 579 {
 580         if (output >= Mixer::OUTPUT_INPUT0) {
 581                 unsigned channel = output - Mixer::OUTPUT_INPUT0;
 582                 previews[channel]->frame->setStyleSheet(QString::fromStdString("background-color:" + color));
 583         }
 584 }
 585
 586 void MainWindow::transition_clicked(int transition_number)
 587 {
 588         global_mixer->transition_clicked(transition_number);
 589 }
 590
 591 void MainWindow::channel_clicked(int channel_number)
 592 {
 593         if (current_wb_pick_display == channel_number) {
 594                 // The picking was already done from eventFilter(), since we don't get
 595                 // the mouse pointer here.
 596         } else {
 597                 global_mixer->channel_clicked(channel_number);
 598         }
 599 }
 600
 601 void MainWindow::wb_button_clicked(int channel_number)
 602 {
 603         current_wb_pick_display = channel_number;
 604         QApplication::setOverrideCursor(Qt::CrossCursor);
 605 }
 606
 607 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 608 {
 609         if (current_wb_pick_display != -1 &&
 610             event->type() == QEvent::MouseButtonRelease &&
 611             watched->isWidgetType()) {
 612                 QApplication::restoreOverrideCursor();
 613                 if (watched == previews[current_wb_pick_display]->display) {
 614                         const QMouseEvent *mouse_event = (QMouseEvent *)event;
 615                         set_white_balance(current_wb_pick_display, mouse_event->x(), mouse_event->y());
 616                 } else {
 617                         // The user clicked on something else, give up.
 618                         // (The click goes through, which might not be ideal, but, yes.)
 619                         current_wb_pick_display = -1;
 620                 }
 621         }
 622         return false;
 623 }
 624
 625 namespace {
 626
 627 double srgb_to_linear(double x)
 628 {
 629         if (x < 0.04045) {
 630                 return x / 12.92;
 631         } else {
 632                 return pow((x + 0.055) / 1.055, 2.4);
 633         }
 634 }
 635
 636 }  // namespace
 637
 638 void MainWindow::set_white_balance(int channel_number, int x, int y)
 639 {
 640         // Set the white balance to neutral for the grab. It's probably going to
 641         // flicker a bit, but hopefully this display is not live anyway.
 642         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, 0.5, 0.5, 0.5);
 643         previews[channel_number]->display->updateGL();
 644         QRgb reference_color = previews[channel_number]->display->grabFrameBuffer().pixel(x, y);
 645
 646         double r = srgb_to_linear(qRed(reference_color) / 255.0);
 647         double g = srgb_to_linear(qGreen(reference_color) / 255.0);
 648         double b = srgb_to_linear(qBlue(reference_color) / 255.0);
 649         global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
 650         previews[channel_number]->display->updateGL();
 651 }