+ // Ask for a relayout, but only after the event loop is done doing relayout
+ // on everything else.
+ QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
+}
+
+void MainWindow::mixer_created(Mixer *mixer)
+{
+ // Make the previews.
+ unsigned num_previews = mixer->get_num_channels();
+
+ for (unsigned i = 0; i < num_previews; ++i) {
+ Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
+
+ QWidget *preview = new QWidget(this);
+ Ui::Display *ui_display = new Ui::Display;
+ ui_display->setupUi(preview);
+ ui_display->label->setText(mixer->get_channel_name(output).c_str());
+ ui_display->display->set_output(output);
+ ui->preview_displays->insertWidget(previews.size(), preview, 1);
+ previews.push_back(ui_display);
+
+ // Hook up the click.
+ connect(ui_display->display, &GLWidget::clicked, bind(&MainWindow::channel_clicked, this, i));
+
+ // Let the theme update the text whenever the resolution or color changed.
+ connect(ui_display->display, &GLWidget::name_updated, this, &MainWindow::update_channel_name);
+ connect(ui_display->display, &GLWidget::color_updated, this, &MainWindow::update_channel_color);
+
+ // Hook up the keyboard key.
+ QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
+ connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
+
+ // Hook up the white balance button (irrelevant if invisible).
+ ui_display->wb_button->setVisible(mixer->get_supports_set_wb(output));
+ connect(ui_display->wb_button, &QPushButton::clicked, bind(&MainWindow::wb_button_clicked, this, i));
+ }
+
+ // TODO: Fetch all of the values these for completeness,
+ // not just the enable knobs implied by flags.
+ ui->locut_enabled->setChecked(global_mixer->get_locut_enabled());
+ ui->gainstaging_knob->setValue(global_mixer->get_gain_staging_db());
+ ui->gainstaging_auto_checkbox->setChecked(global_mixer->get_gain_staging_auto());
+ ui->compressor_enabled->setChecked(global_mixer->get_compressor_enabled());
+ ui->limiter_enabled->setChecked(global_mixer->get_limiter_enabled());
+ ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_final_makeup_gain_auto());
+
+ ui->limiter_threshold_db_display->setText(
+ QString::fromStdString(format_db(mixer->get_limiter_threshold_dbfs())));
+ ui->compressor_threshold_db_display->setText(
+ QString::fromStdString(format_db(mixer->get_compressor_threshold_dbfs())));
+
+ connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
+ cutoff_knob_changed(ui->locut_cutoff_knob->value());
+ connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
+ global_mixer->set_locut_enabled(state == Qt::Checked);
+ });
+
+ connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged, this, &MainWindow::gain_staging_knob_changed);
+ connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
+ global_mixer->set_gain_staging_auto(state == Qt::Checked);
+ });
+ connect(ui->makeup_gain_knob, &QAbstractSlider::valueChanged, this, &MainWindow::final_makeup_gain_knob_changed);
+ connect(ui->makeup_gain_auto_checkbox, &QCheckBox::stateChanged, [this](int state){
+ global_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
+ });
+
+ connect(ui->limiter_threshold_knob, &QDial::valueChanged, this, &MainWindow::limiter_threshold_knob_changed);
+ connect(ui->compressor_threshold_knob, &QDial::valueChanged, this, &MainWindow::compressor_threshold_knob_changed);
+ connect(ui->limiter_enabled, &QCheckBox::stateChanged, [this](int state){
+ global_mixer->set_limiter_enabled(state == Qt::Checked);
+ });
+ connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this](int state){
+ global_mixer->set_compressor_enabled(state == Qt::Checked);
+ });
+ connect(ui->reset_meters_button, &QPushButton::clicked, this, &MainWindow::reset_meters_button_clicked);
+ mixer->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
+
+ struct sigaction act;
+ memset(&act, 0, sizeof(act));
+ act.sa_handler = schedule_cut_signal;
+ act.sa_flags = SA_RESTART;
+ sigaction(SIGHUP, &act, nullptr);
+
+ // Mostly for debugging. Don't override SIGINT, that's so evil if
+ // shutdown isn't instant.
+ memset(&act, 0, sizeof(act));
+ act.sa_handler = quit_signal;
+ act.sa_flags = SA_RESTART;
+ sigaction(SIGUSR1, &act, nullptr);
+}
+
+void MainWindow::mixer_shutting_down()
+{
+ ui->me_live->clean_context();
+ ui->me_preview->clean_context();
+ for (Ui::Display *display : previews) {
+ display->display->clean_context();
+ }
+}
+
+void MainWindow::cut_triggered()
+{
+ global_mixer->schedule_cut();
+}
+
+void MainWindow::x264_bitrate_triggered()
+{
+ bool ok;
+ 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);
+ if (ok && new_bitrate >= 100 && new_bitrate <= 100000) {
+ global_flags.x264_bitrate = new_bitrate;
+ global_mixer->change_x264_bitrate(new_bitrate);
+ }
+}
+
+void MainWindow::exit_triggered()
+{
+ close();
+}
+
+void MainWindow::about_triggered()
+{
+ AboutDialog().exec();
+}
+
+void MainWindow::gain_staging_knob_changed(int value)
+{
+ ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
+
+ float gain_db = value * 0.1f;
+ global_mixer->set_gain_staging_db(gain_db);
+
+ // The label will be updated by the audio level callback.
+}
+
+void MainWindow::final_makeup_gain_knob_changed(int value)
+{
+ ui->makeup_gain_auto_checkbox->setCheckState(Qt::Unchecked);
+
+ float gain_db = value * 0.1f;
+ global_mixer->set_final_makeup_gain_db(gain_db);
+
+ // The label will be updated by the audio level callback.
+}
+
+void MainWindow::cutoff_knob_changed(int value)
+{
+ float octaves = value * 0.1f;
+ float cutoff_hz = 20.0 * pow(2.0, octaves);
+ global_mixer->set_locut_cutoff(cutoff_hz);
+
+ char buf[256];
+ snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
+ ui->locut_cutoff_display->setText(buf);
+}
+
+void MainWindow::limiter_threshold_knob_changed(int value)
+{
+ float threshold_dbfs = value * 0.1f;
+ global_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
+ ui->limiter_threshold_db_display->setText(
+ QString::fromStdString(format_db(threshold_dbfs)));
+}
+
+void MainWindow::compressor_threshold_knob_changed(int value)
+{
+ float threshold_dbfs = value * 0.1f;
+ global_mixer->set_compressor_threshold_dbfs(threshold_dbfs);
+ ui->compressor_threshold_db_display->setText(
+ QString::fromStdString(format_db(threshold_dbfs)));
+}
+
+void MainWindow::reset_meters_button_clicked()
+{
+ global_mixer->reset_meters();
+ ui->peak_display->setText("-inf");
+ ui->peak_display->setStyleSheet("");
+}
+
+void MainWindow::audio_level_callback(float level_lufs, float peak_db, float global_level_lufs,
+ float range_low_lufs, float range_high_lufs,
+ float gain_staging_db, float final_makeup_gain_db,
+ float correlation)
+{
+ timespec now;
+ clock_gettime(CLOCK_MONOTONIC, &now);
+
+ // The meters are somewhat inefficient to update. Only update them
+ // every 100 ms or so (we get updates every 5–20 ms).
+ double last_update_age = now.tv_sec - last_audio_level_callback.tv_sec +
+ 1e-9 * (now.tv_nsec - last_audio_level_callback.tv_nsec);
+ if (last_update_age < 0.100) {
+ return;
+ }
+ last_audio_level_callback = now;
+
+ post_to_main_thread([=]() {
+ ui->vu_meter->set_level(level_lufs);
+ ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
+ ui->correlation_meter->set_correlation(correlation);
+
+ ui->peak_display->setText(QString::fromStdString(format_db(peak_db)));
+ if (peak_db > -0.1f) { // -0.1 dBFS is EBU peak limit.
+ ui->peak_display->setStyleSheet("QLabel { background-color: red; color: white; }");
+ } else {
+ ui->peak_display->setStyleSheet("");
+ }
+
+ ui->gainstaging_knob->blockSignals(true);
+ ui->gainstaging_knob->setValue(lrintf(gain_staging_db * 10.0f));
+ ui->gainstaging_knob->blockSignals(false);
+ ui->gainstaging_db_display->setText(
+ QString::fromStdString(format_db_with_sign(gain_staging_db)));
+
+ ui->makeup_gain_knob->blockSignals(true);
+ ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
+ ui->makeup_gain_knob->blockSignals(false);
+ ui->makeup_gain_db_display->setText(
+ QString::fromStdString(format_db_with_sign(final_makeup_gain_db)));
+ });
+}
+
+void MainWindow::relayout()
+{
+ int height = ui->vertical_layout->geometry().height();
+
+ double remaining_height = height;
+