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

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