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

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