]> git.sesse.net Git - nageru/blobdiff - mainwindow.cpp
Fix an issue where the mixer lagging too much behind CEF would cause us to display...
[nageru] / mainwindow.cpp
index cfc15699261b04ef3b9edb9847fd3b1780279e39..6c1c790b41f30098b428b8e6be9af3aaa72b94a1 100644 (file)
@@ -1,33 +1,75 @@
 #include "mainwindow.h"
 
-#include <math.h>
-#include <stdio.h>
+#include <assert.h>
 #include <signal.h>
-#include <algorithm>
-#include <string>
-#include <vector>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <QAbstractButton>
+#include <QAbstractSlider>
+#include <QAction>
+#include <QActionGroup>
+#include <QApplication>
 #include <QBoxLayout>
+#include <QCheckBox>
+#include <QDesktopServices>
+#include <QDial>
+#include <QDialog>
+#include <QEvent>
+#include <QFlags>
+#include <QFrame>
+#include <QImage>
+#include <QInputDialog>
 #include <QKeySequence>
 #include <QLabel>
-#include <QMetaType>
+#include <QLayoutItem>
+#include <QMenuBar>
+#include <QMessageBox>
+#include <QMouseEvent>
+#include <QObject>
 #include <QPushButton>
-#include <QResizeEvent>
+#include <QRect>
+#include <QRgb>
 #include <QShortcut>
-#include <QSize>
-#include <QString>
+#include <QStackedWidget>
+#include <QToolButton>
+#include <QWidget>
+#include <algorithm>
+#include <chrono>
+#include <cmath>
+#include <functional>
+#include <limits>
+#include <memory>
+#include <ratio>
+#include <string>
+#include <vector>
 
 #include "aboutdialog.h"
+#include "alsa_pool.h"
+#include "analyzer.h"
+#include "clickable_label.h"
+#include "context_menus.h"
+#include "correlation_meter.h"
+#include "disk_space_estimator.h"
+#include "ellipsis_label.h"
+#include "flags.h"
 #include "glwidget.h"
+#include "input_mapping.h"
+#include "input_mapping_dialog.h"
 #include "lrameter.h"
+#include "midi_mapping.pb.h"
+#include "midi_mapping_dialog.h"
 #include "mixer.h"
+#include "nonlinear_fader.h"
 #include "post_to_main_thread.h"
+#include "ui_audio_expanded_view.h"
+#include "ui_audio_miniview.h"
 #include "ui_display.h"
 #include "ui_mainwindow.h"
 #include "vumeter.h"
 
-class QResizeEvent;
-
 using namespace std;
+using namespace std::chrono;
 using namespace std::placeholders;
 
 Q_DECLARE_METATYPE(std::string);
@@ -35,6 +77,10 @@ Q_DECLARE_METATYPE(std::vector<std::string>);
 
 MainWindow *global_mainwindow = nullptr;
 
+// -0.1 dBFS is EBU peak limit. We use it consistently, even for the bus meters
+// (which don't calculate interpolate peak, and in general don't follow EBU recommendations).
+constexpr float peak_limit_dbfs = -0.1f;
+
 namespace {
 
 void schedule_cut_signal(int ignored)
@@ -47,21 +93,135 @@ void quit_signal(int ignored)
        global_mainwindow->close();
 }
 
+void slave_knob(QDial *master, QDial *slave)
+{
+       QWidget::connect(master, &QDial::valueChanged, [slave](int value){
+               slave->blockSignals(true);
+               slave->setValue(value);
+               slave->blockSignals(false);
+       });
+       QWidget::connect(slave, &QDial::valueChanged, [master](int value){
+               master->setValue(value);
+       });
+}
+
+void slave_checkbox(QCheckBox *master, QCheckBox *slave)
+{
+       QWidget::connect(master, &QCheckBox::stateChanged, [slave](int state){
+               slave->blockSignals(true);
+               slave->setCheckState(Qt::CheckState(state));
+               slave->blockSignals(false);
+       });
+       QWidget::connect(slave, &QCheckBox::stateChanged, [master](int state){
+               master->setCheckState(Qt::CheckState(state));
+       });
+}
+
+void slave_fader(NonLinearFader *master, NonLinearFader *slave)
+{
+       QWidget::connect(master, &NonLinearFader::dbValueChanged, [slave](double value) {
+               slave->blockSignals(true);
+               slave->setDbValue(value);
+               slave->blockSignals(false);
+       });
+       QWidget::connect(slave, &NonLinearFader::dbValueChanged, [master](double value){
+               master->setDbValue(value);
+       });
+}
+
+constexpr unsigned DB_NO_FLAGS = 0x0;
+constexpr unsigned DB_WITH_SIGN = 0x1;
+constexpr unsigned DB_BARE = 0x2;
+
+string format_db(double db, unsigned flags)
+{
+       string text;
+       if (flags & DB_WITH_SIGN) {
+               if (isfinite(db)) {
+                       char buf[256];
+                       snprintf(buf, sizeof(buf), "%+.1f", db);
+                       text = buf;
+               } else if (db < 0.0) {
+                       text = "-∞";
+               } else {
+                       // Should never happen, really.
+                       text = "+∞";
+               }
+       } else {
+               if (isfinite(db)) {
+                       char buf[256];
+                       snprintf(buf, sizeof(buf), "%.1f", db);
+                       text = buf;
+               } else if (db < 0.0) {
+                       text = "-∞";
+               } else {
+                       // Should never happen, really.
+                       text = "∞";
+               }
+       }
+       if (!(flags & DB_BARE)) {
+               text += " dB";
+       }
+       return text;
+}
+
+void set_peak_label(QLabel *peak_label, float peak_db)
+{
+       peak_label->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
+
+       if (peak_db > peak_limit_dbfs) {
+               peak_label->setStyleSheet("QLabel { background-color: red; color: white; }");
+       } else {
+               peak_label->setStyleSheet("");
+       }
+}
+
 }  // namespace
 
 MainWindow::MainWindow()
-       : ui(new Ui::MainWindow)
+       : ui(new Ui::MainWindow), midi_mapper(this)
 {
        global_mainwindow = this;
        ui->setupUi(this);
 
+       global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
+       disk_free_label = new QLabel(this);
+       disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
+       ui->menuBar->setCornerWidget(disk_free_label);
+
+       QActionGroup *audio_mapping_group = new QActionGroup(this);
+       ui->simple_audio_mode->setActionGroup(audio_mapping_group);
+       ui->multichannel_audio_mode->setActionGroup(audio_mapping_group);
+
        ui->me_live->set_output(Mixer::OUTPUT_LIVE);
        ui->me_preview->set_output(Mixer::OUTPUT_PREVIEW);
 
        // The menus.
        connect(ui->cut_action, &QAction::triggered, this, &MainWindow::cut_triggered);
        connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
-       connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered),
+       connect(ui->manual_action, &QAction::triggered, this, &MainWindow::manual_triggered);
+       connect(ui->about_action, &QAction::triggered, this, &MainWindow::about_triggered);
+       connect(ui->open_analyzer_action, &QAction::triggered, this, &MainWindow::open_analyzer_triggered);
+       connect(ui->simple_audio_mode, &QAction::triggered, this, &MainWindow::simple_audio_mode_triggered);
+       connect(ui->multichannel_audio_mode, &QAction::triggered, this, &MainWindow::multichannel_audio_mode_triggered);
+       connect(ui->input_mapping_action, &QAction::triggered, this, &MainWindow::input_mapping_triggered);
+       connect(ui->midi_mapping_action, &QAction::triggered, this, &MainWindow::midi_mapping_triggered);
+       connect(ui->timecode_stream_action, &QAction::triggered, this, &MainWindow::timecode_stream_triggered);
+       connect(ui->timecode_stdout_action, &QAction::triggered, this, &MainWindow::timecode_stdout_triggered);
+
+       ui->timecode_stream_action->setChecked(global_flags.display_timecode_in_stream);
+       ui->timecode_stdout_action->setChecked(global_flags.display_timecode_on_stdout);
+
+       if (global_flags.x264_video_to_http && isinf(global_flags.x264_crf)) {
+               connect(ui->x264_bitrate_action, &QAction::triggered, this, &MainWindow::x264_bitrate_triggered);
+       } else {
+               ui->x264_bitrate_action->setEnabled(false);
+       }
+
+       connect(ui->video_menu, &QMenu::aboutToShow, [this]{
+               fill_hdmi_sdi_output_device_menu(ui->hdmi_sdi_output_device_menu);
+               fill_hdmi_sdi_output_resolution_menu(ui->hdmi_sdi_output_resolution_menu);
+       });
 
        // Hook up the transition buttons. (Keyboard shortcuts are set in set_transition_names().)
        // TODO: Make them dynamic.
@@ -77,6 +237,56 @@ MainWindow::MainWindow()
        qRegisterMetaType<vector<string>>("std::vector<std::string>");
        connect(ui->me_live, &GLWidget::transition_names_updated, this, &MainWindow::set_transition_names);
        qRegisterMetaType<Mixer::Output>("Mixer::Output");
+
+       // Hook up the prev/next buttons on the audio views.
+       auto prev_page = [this]{
+               if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+                       ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 2) % 3);
+               } else {
+                       ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
+               }
+       };
+       auto next_page = [this]{
+               if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+                       ui->audio_views->setCurrentIndex((ui->audio_views->currentIndex() + 1) % 3);
+               } else {
+                       ui->audio_views->setCurrentIndex(2 - ui->audio_views->currentIndex());  // Switch between 0 and 2.
+               }
+       };
+       connect(ui->compact_prev_page, &QAbstractButton::clicked, prev_page);
+       connect(ui->compact_next_page, &QAbstractButton::clicked, next_page);
+       connect(ui->full_prev_page, &QAbstractButton::clicked, prev_page);
+       connect(ui->full_next_page, &QAbstractButton::clicked, next_page);
+       connect(ui->video_grid_prev_page, &QAbstractButton::clicked, prev_page);
+       connect(ui->video_grid_next_page, &QAbstractButton::clicked, next_page);
+
+       // And bind the same to PgUp/PgDown.
+       connect(new QShortcut(QKeySequence::MoveToNextPage, this), &QShortcut::activated, next_page);
+       connect(new QShortcut(QKeySequence::MoveToPreviousPage, this), &QShortcut::activated, prev_page);
+
+       // When the audio view changes, move the previews.
+       connect(ui->audio_views, &QStackedWidget::currentChanged, bind(&MainWindow::audio_view_changed, this, _1));
+
+       if (global_flags.enable_quick_cut_keys) {
+               ui->quick_cut_enable_action->setChecked(true);
+       }
+       connect(ui->quick_cut_enable_action, &QAction::changed, [this](){
+               global_flags.enable_quick_cut_keys = ui->quick_cut_enable_action->isChecked();
+       });
+
+       last_audio_level_callback = steady_clock::now() - seconds(1);
+
+       if (!global_flags.midi_mapping_filename.empty()) {
+               MIDIMappingProto midi_mapping;
+               if (!load_midi_mapping_from_file(global_flags.midi_mapping_filename, &midi_mapping)) {
+                       fprintf(stderr, "Couldn't load MIDI mapping '%s'; exiting.\n",
+                               global_flags.midi_mapping_filename.c_str());
+                       exit(1);
+               }
+               midi_mapper.set_midi_mapping(midi_mapping);
+       }
+       midi_mapper.refresh_highlights();
+       midi_mapper.refresh_lights();
 }
 
 void MainWindow::resizeEvent(QResizeEvent* event)
@@ -93,15 +303,15 @@ void MainWindow::mixer_created(Mixer *mixer)
        // Make the previews.
        unsigned num_previews = mixer->get_num_channels();
 
+       const char qwerty[] = "QWERTYUIOP";
        for (unsigned i = 0; i < num_previews; ++i) {
                Mixer::Output output = Mixer::Output(Mixer::OUTPUT_INPUT0 + i);
 
-               QWidget *preview = new QWidget(this);
+               QWidget *preview = new QWidget(this);  // Will be connected to a layout immediately after the loop.
                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.
@@ -115,43 +325,94 @@ void MainWindow::mixer_created(Mixer *mixer)
                QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_1 + i), this);
                connect(shortcut, &QShortcut::activated, bind(&MainWindow::channel_clicked, this, i));
 
+               // Hook up the quick-cut key.
+               if (i < strlen(qwerty)) {
+                       QShortcut *shortcut = new QShortcut(QKeySequence(qwerty[i]), this);
+                       connect(shortcut, &QShortcut::activated, bind(&MainWindow::quick_cut_activated, 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));
        }
 
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", mixer->get_limiter_threshold_dbfs());
-       ui->limiter_threshold_db_display->setText(buf);
-       snprintf(buf, sizeof(buf), "%.1f dB", mixer->get_compressor_threshold_dbfs());
-       ui->compressor_threshold_db_display->setText(buf);
+       // Connect the previews to the correct layout.
+       audio_view_changed(ui->audio_views->currentIndex());
+
+       global_audio_mixer->set_state_changed_callback(bind(&MainWindow::audio_state_changed, this));
+
+       slave_knob(ui->locut_cutoff_knob, ui->locut_cutoff_knob_2);
+       slave_knob(ui->limiter_threshold_knob, ui->limiter_threshold_knob_2);
+       slave_knob(ui->makeup_gain_knob, ui->makeup_gain_knob_2);
+       slave_checkbox(ui->makeup_gain_auto_checkbox, ui->makeup_gain_auto_checkbox_2);
+       slave_checkbox(ui->limiter_enabled, ui->limiter_enabled_2);
+
+       reset_audio_mapping_ui();
+
+       // TODO: Fetch all of the values these for completeness,
+       // not just the enable knobs implied by flags.
+       ui->limiter_enabled->setChecked(global_audio_mixer->get_limiter_enabled());
+       ui->makeup_gain_auto_checkbox->setChecked(global_audio_mixer->get_final_makeup_gain_auto());
+
+       // Controls used only for simple audio fetch their state from the first bus.
+       constexpr unsigned simple_bus_index = 0;
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
+               ui->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(simple_bus_index));
+               ui->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(simple_bus_index));
+               ui->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(simple_bus_index));
+               ui->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(simple_bus_index));
+               ui->compressor_threshold_db_display->setText(
+                       QString::fromStdString(format_db(mixer->get_audio_mixer()->get_compressor_threshold_dbfs(simple_bus_index), DB_WITH_SIGN)));
+       }
+       connect(ui->locut_enabled, &QCheckBox::stateChanged, [this](int state){
+               global_audio_mixer->set_locut_enabled(simple_bus_index, state == Qt::Checked);
+               midi_mapper.refresh_lights();
+       });
+       connect(ui->gainstaging_knob, &QAbstractSlider::valueChanged,
+               bind(&MainWindow::gain_staging_knob_changed, this, simple_bus_index, _1));
+       connect(ui->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
+               global_audio_mixer->set_gain_staging_auto(simple_bus_index, state == Qt::Checked);
+               midi_mapper.refresh_lights();
+       });
+       connect(ui->compressor_threshold_knob, &QDial::valueChanged,
+               bind(&MainWindow::compressor_threshold_knob_changed, this, simple_bus_index, _1));
+       connect(ui->compressor_enabled, &QCheckBox::stateChanged, [this, simple_bus_index](int state){
+               global_audio_mixer->set_compressor_enabled(simple_bus_index, state == Qt::Checked);
+               midi_mapper.refresh_lights();
+       });
+
+       // Global mastering controls.
+       QString limiter_threshold_label(
+               QString::fromStdString(format_db(mixer->get_audio_mixer()->get_limiter_threshold_dbfs(), DB_WITH_SIGN)));
+       ui->limiter_threshold_db_display->setText(limiter_threshold_label);
+       ui->limiter_threshold_db_display_2->setText(limiter_threshold_label);
 
        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);
-       });
 
-       // Not QDial::valueChanged, as we call setValue() all the time.
-       connect(ui->gainstaging_knob, &QAbstractSlider::sliderMoved, 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::sliderMoved, this, &MainWindow::final_makeup_gain_knob_changed);
+       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);
+               global_audio_mixer->set_final_makeup_gain_auto(state == Qt::Checked);
+               midi_mapper.refresh_lights();
        });
 
        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);
+               global_audio_mixer->set_limiter_enabled(state == Qt::Checked);
+               midi_mapper.refresh_lights();
        });
        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));
+       // Even though we have a reset button right next to it, the fact that
+       // the expanded audio view labels are clickable makes it natural to
+       // click this one as well.
+       connect(ui->peak_display, &ClickableLabel::clicked, this, &MainWindow::reset_meters_button_clicked);
+       mixer->get_audio_mixer()->set_audio_level_callback(bind(&MainWindow::audio_level_callback, this, _1, _2, _3, _4, _5, _6, _7, _8));
+
+       midi_mapper.refresh_highlights();
+       midi_mapper.refresh_lights();
+       midi_mapper.start_thread();
+
+       analyzer.reset(new Analyzer);
 
        struct sigaction act;
        memset(&act, 0, sizeof(act));
@@ -167,13 +428,177 @@ void MainWindow::mixer_created(Mixer *mixer)
        sigaction(SIGUSR1, &act, nullptr);
 }
 
+void MainWindow::reset_audio_mapping_ui()
+{
+       bool simple = (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE);
+
+       ui->simple_audio_mode->setChecked(simple);
+       ui->multichannel_audio_mode->setChecked(!simple);
+       ui->input_mapping_action->setEnabled(!simple);
+       ui->midi_mapping_action->setEnabled(!simple);
+
+       ui->locut_enabled->setVisible(simple);
+       ui->gainstaging_label->setVisible(simple);
+       ui->gainstaging_knob->setVisible(simple);
+       ui->gainstaging_db_display->setVisible(simple);
+       ui->gainstaging_auto_checkbox->setVisible(simple);
+       ui->compressor_threshold_label->setVisible(simple);
+       ui->compressor_threshold_knob->setVisible(simple);
+       ui->compressor_threshold_db_display->setVisible(simple);
+       ui->compressor_enabled->setVisible(simple);
+
+       setup_audio_miniview();
+       setup_audio_expanded_view();
+
+       if (simple) {
+               ui->compact_label->setText("Compact audio view (1/2)  ");
+               ui->video_grid_label->setText("Video grid display (2/2)  ");
+               if (ui->audio_views->currentIndex() == 1) {
+                       // Full audio view is not available in simple mode.
+                       ui->audio_views->setCurrentIndex(0);
+               }
+       } else {
+               ui->compact_label->setText("Compact audio view (1/3)  ");
+               ui->full_label->setText("Full audio view (2/3)  ");
+               ui->video_grid_label->setText("Video grid display (3/3)  ");
+       }
+
+       midi_mapper.refresh_highlights();
+       midi_mapper.refresh_lights();
+}
+
+void MainWindow::setup_audio_miniview()
+{
+       // Remove any existing channels.
+       for (QLayoutItem *item; (item = ui->faders->takeAt(0)) != nullptr; ) {
+               delete item->widget();
+               delete item;
+       }
+       audio_miniviews.clear();
+
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
+               return;
+       }
+
+       // Set up brand new ones from the input mapping.
+       InputMapping mapping = global_audio_mixer->get_input_mapping();
+       audio_miniviews.resize(mapping.buses.size());
+       for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
+               QWidget *channel = new QWidget(this);
+               Ui::AudioMiniView *ui_audio_miniview = new Ui::AudioMiniView;
+               ui_audio_miniview->setupUi(channel);
+               ui_audio_miniview->bus_desc_label->setFullText(
+                       QString::fromStdString(mapping.buses[bus_index].name));
+               audio_miniviews[bus_index] = ui_audio_miniview;
+
+               // Set up the peak meter.
+               VUMeter *peak_meter = ui_audio_miniview->peak_meter;
+               peak_meter->set_min_level(-30.0f);
+               peak_meter->set_max_level(0.0f);
+               peak_meter->set_ref_level(0.0f);
+
+               ui_audio_miniview->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
+
+               ui->faders->addWidget(channel);
+
+               connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
+                       bind(&MainWindow::mini_fader_changed, this, bus_index, _1));
+               connect(ui_audio_miniview->peak_display_label, &ClickableLabel::clicked,
+                       [bus_index]() {
+                               global_audio_mixer->reset_peak(bus_index);
+                       });
+       }
+}
+
+void MainWindow::setup_audio_expanded_view()
+{
+       // Remove any existing channels.
+       for (QLayoutItem *item; (item = ui->buses->takeAt(0)) != nullptr; ) {
+               delete item->widget();
+               delete item;
+       }
+       audio_expanded_views.clear();
+
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
+               return;
+       }
+
+       // Set up brand new ones from the input mapping.
+       InputMapping mapping = global_audio_mixer->get_input_mapping();
+       audio_expanded_views.resize(mapping.buses.size());
+       for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
+               QWidget *channel = new QWidget(this);
+               Ui::AudioExpandedView *ui_audio_expanded_view = new Ui::AudioExpandedView;
+               ui_audio_expanded_view->setupUi(channel);
+               ui_audio_expanded_view->bus_desc_label->setFullText(
+                       QString::fromStdString(mapping.buses[bus_index].name));
+               audio_expanded_views[bus_index] = ui_audio_expanded_view;
+               update_eq_label(bus_index, EQ_BAND_TREBLE, global_audio_mixer->get_eq(bus_index, EQ_BAND_TREBLE));
+               update_eq_label(bus_index, EQ_BAND_MID, global_audio_mixer->get_eq(bus_index, EQ_BAND_MID));
+               update_eq_label(bus_index, EQ_BAND_BASS, global_audio_mixer->get_eq(bus_index, EQ_BAND_BASS));
+               ui_audio_expanded_view->fader->setDbValue(global_audio_mixer->get_fader_volume(bus_index));
+               ui_audio_expanded_view->mute_button->setChecked(global_audio_mixer->get_mute(bus_index));
+               connect(ui_audio_expanded_view->mute_button, &QPushButton::toggled,
+                       bind(&MainWindow::mute_button_toggled, this, bus_index, _1));
+               ui->buses->addWidget(channel);
+
+               ui_audio_expanded_view->locut_enabled->setChecked(global_audio_mixer->get_locut_enabled(bus_index));
+               connect(ui_audio_expanded_view->locut_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
+                       global_audio_mixer->set_locut_enabled(bus_index, state == Qt::Checked);
+                       midi_mapper.refresh_lights();
+               });
+
+               connect(ui_audio_expanded_view->treble_knob, &QDial::valueChanged,
+                       bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_TREBLE, _1));
+               connect(ui_audio_expanded_view->mid_knob, &QDial::valueChanged,
+                       bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_MID, _1));
+               connect(ui_audio_expanded_view->bass_knob, &QDial::valueChanged,
+                       bind(&MainWindow::eq_knob_changed, this, bus_index, EQ_BAND_BASS, _1));
+
+               ui_audio_expanded_view->gainstaging_knob->setValue(global_audio_mixer->get_gain_staging_db(bus_index));
+               ui_audio_expanded_view->gainstaging_auto_checkbox->setChecked(global_audio_mixer->get_gain_staging_auto(bus_index));
+               ui_audio_expanded_view->compressor_enabled->setChecked(global_audio_mixer->get_compressor_enabled(bus_index));
+
+               connect(ui_audio_expanded_view->gainstaging_knob, &QAbstractSlider::valueChanged, bind(&MainWindow::gain_staging_knob_changed, this, bus_index, _1));
+               connect(ui_audio_expanded_view->gainstaging_auto_checkbox, &QCheckBox::stateChanged, [this, bus_index](int state){
+                       global_audio_mixer->set_gain_staging_auto(bus_index, state == Qt::Checked);
+                       midi_mapper.refresh_lights();
+               });
+
+               connect(ui_audio_expanded_view->compressor_threshold_knob, &QDial::valueChanged, bind(&MainWindow::compressor_threshold_knob_changed, this, bus_index, _1));
+               connect(ui_audio_expanded_view->compressor_enabled, &QCheckBox::stateChanged, [this, bus_index](int state){
+                       global_audio_mixer->set_compressor_enabled(bus_index, state == Qt::Checked);
+                       midi_mapper.refresh_lights();
+               });
+
+               slave_fader(audio_miniviews[bus_index]->fader, ui_audio_expanded_view->fader);
+
+               // Set up the peak meter.
+               VUMeter *peak_meter = ui_audio_expanded_view->peak_meter;
+               peak_meter->set_min_level(-30.0f);
+               peak_meter->set_max_level(0.0f);
+               peak_meter->set_ref_level(0.0f);
+
+               connect(ui_audio_expanded_view->peak_display_label, &ClickableLabel::clicked,
+                       [this, bus_index]() {
+                               global_audio_mixer->reset_peak(bus_index);
+                               midi_mapper.refresh_lights();
+                       });
+       }
+
+       update_cutoff_labels(global_audio_mixer->get_locut_cutoff());
+}
+
 void MainWindow::mixer_shutting_down()
 {
-       ui->me_live->clean_context();
-       ui->me_preview->clean_context();
+       ui->me_live->shutdown();
+       ui->me_preview->shutdown();
+
        for (Ui::Display *display : previews) {
-               display->display->clean_context();
+               display->display->shutdown();
        }
+
+       analyzer->mixer_shutting_down();
 }
 
 void MainWindow::cut_triggered()
@@ -181,22 +606,113 @@ 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::manual_triggered()
+{
+       if (!QDesktopServices::openUrl(QUrl("https://nageru.sesse.net/doc/"))) {
+               QMessageBox msgbox;
+               msgbox.setText("Could not launch manual in web browser.\nPlease see https://nageru.sesse.net/doc/ manually.");
+               msgbox.exec();
+       }
+}
+
 void MainWindow::about_triggered()
 {
        AboutDialog().exec();
 }
 
-void MainWindow::gain_staging_knob_changed(int value)
+void MainWindow::open_analyzer_triggered()
 {
-       ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
+       analyzer->show();
+}
+
+void MainWindow::simple_audio_mode_triggered()
+{
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
+               return;
+       }
+       unsigned card_index = global_audio_mixer->get_simple_input();
+       if (card_index == numeric_limits<unsigned>::max()) {
+               QMessageBox::StandardButton reply =
+                       QMessageBox::question(this,
+                               "Mapping too complex",
+                               "The current audio mapping is too complicated to be representable in simple mode, "
+                                       "and will be discarded if you proceed. Really go to simple audio mode?",
+                               QMessageBox::Yes | QMessageBox::No);
+               if (reply == QMessageBox::No) {
+                       ui->simple_audio_mode->setChecked(false);
+                       ui->multichannel_audio_mode->setChecked(true);
+                       return;
+               }
+               card_index = 0;
+       }
+       global_audio_mixer->set_simple_input(/*card_index=*/card_index);
+       reset_audio_mapping_ui();
+}
+
+void MainWindow::multichannel_audio_mode_triggered()
+{
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+               return;
+       }
+
+       // Take the generated input mapping from the simple input,
+       // and set it as a normal multichannel mapping, which causes
+       // the mode to go to multichannel.
+       global_audio_mixer->set_input_mapping(global_audio_mixer->get_input_mapping());
+       reset_audio_mapping_ui();
+}
+
+void MainWindow::input_mapping_triggered()
+{
+       if (InputMappingDialog().exec() == QDialog::Accepted) {
+               setup_audio_miniview();
+               setup_audio_expanded_view();
+       }
+       midi_mapper.refresh_highlights();
+       midi_mapper.refresh_lights();
+}
+
+void MainWindow::midi_mapping_triggered()
+{
+       MIDIMappingDialog(&midi_mapper).exec();
+}
+
+void MainWindow::timecode_stream_triggered()
+{
+       global_mixer->set_display_timecode_in_stream(ui->timecode_stream_action->isChecked());
+}
+
+void MainWindow::timecode_stdout_triggered()
+{
+       global_mixer->set_display_timecode_on_stdout(ui->timecode_stdout_action->isChecked());
+}
+
+void MainWindow::gain_staging_knob_changed(unsigned bus_index, int value)
+{
+       if (bus_index == 0) {
+               ui->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
+       }
+       if (bus_index < audio_expanded_views.size()) {
+               audio_expanded_views[bus_index]->gainstaging_auto_checkbox->setCheckState(Qt::Unchecked);
+       }
 
        float gain_db = value * 0.1f;
-       global_mixer->set_gain_staging_db(gain_db);
+       global_audio_mixer->set_gain_staging_db(bus_index, gain_db);
 
        // The label will be updated by the audio level callback.
 }
@@ -206,7 +722,7 @@ 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);
+       global_audio_mixer->set_final_makeup_gain_db(gain_db);
 
        // The label will be updated by the audio level callback.
 }
@@ -215,52 +731,145 @@ 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);
+       global_audio_mixer->set_locut_cutoff(cutoff_hz);
+       update_cutoff_labels(cutoff_hz);
+}
 
+void MainWindow::update_cutoff_labels(float cutoff_hz)
+{
        char buf[256];
        snprintf(buf, sizeof(buf), "%ld Hz", lrintf(cutoff_hz));
        ui->locut_cutoff_display->setText(buf);
+       ui->locut_cutoff_display_2->setText(buf);
+
+       for (unsigned bus_index = 0; bus_index < audio_expanded_views.size(); ++bus_index) {
+               audio_expanded_views[bus_index]->locut_enabled->setText(
+                       QString("Lo-cut: ") + buf);
+       }
+}
+
+void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
+{
+       char time_str[256];
+       if (estimated_seconds_left < 60.0) {
+               strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
+       } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
+               int s = lrintf(estimated_seconds_left);
+               int m = s / 60;
+               s %= 60;
+               snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
+       } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
+               int m = lrintf(estimated_seconds_left / 60.0);
+               snprintf(time_str, sizeof(time_str), "%dm", m);
+       } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
+               int m = lrintf(estimated_seconds_left / 60.0);
+               int h = m / 60;
+               m %= 60;
+               snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
+       } else {  // More than ten hours: Xh.
+               int h = lrintf(estimated_seconds_left / 3600.0);
+               snprintf(time_str, sizeof(time_str), "%dh", h);
+       }
+       char buf[256];
+       snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
+
+       std::string label = buf;
+
+       post_to_main_thread([this, label]{
+               disk_free_label->setText(QString::fromStdString(label));
+               ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
+       });
+}
+
+void MainWindow::eq_knob_changed(unsigned bus_index, EQBand band, int value)
+{
+       float gain_db = value * 0.1f;
+       global_audio_mixer->set_eq(bus_index, band, gain_db);
+
+       update_eq_label(bus_index, band, gain_db);
+}
+
+void MainWindow::update_eq_label(unsigned bus_index, EQBand band, float gain_db)
+{
+       Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
+       string db_string = format_db(gain_db, DB_WITH_SIGN);
+       switch (band) {
+       case EQ_BAND_TREBLE:
+               view->treble_label->setText(QString::fromStdString("Treble: " + db_string));
+               break;
+       case EQ_BAND_MID:
+               view->mid_label->setText(QString::fromStdString("Mid: " + db_string));
+               break;
+       case EQ_BAND_BASS:
+               view->bass_label->setText(QString::fromStdString("Bass: " + db_string));
+               break;
+       default:
+               assert(false);
+       }
 }
 
 void MainWindow::limiter_threshold_knob_changed(int value)
 {
        float threshold_dbfs = value * 0.1f;
-       global_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
-
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", threshold_dbfs);
-       ui->limiter_threshold_db_display->setText(buf);
+       global_audio_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
+       ui->limiter_threshold_db_display->setText(
+               QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
+       ui->limiter_threshold_db_display_2->setText(
+               QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 }
 
-void MainWindow::compressor_threshold_knob_changed(int value)
+void MainWindow::compressor_threshold_knob_changed(unsigned bus_index, int value)
 {
        float threshold_dbfs = value * 0.1f;
-       global_mixer->set_compressor_threshold_dbfs(threshold_dbfs);
+       global_audio_mixer->set_compressor_threshold_dbfs(bus_index, threshold_dbfs);
 
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", threshold_dbfs);
-       ui->compressor_threshold_db_display->setText(buf);
+       QString label(QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
+       if (bus_index == 0) {
+               ui->compressor_threshold_db_display->setText(label);
+       }
+       if (bus_index < audio_expanded_views.size()) {
+               audio_expanded_views[bus_index]->compressor_threshold_db_display->setText(label);
+       }
+}
+
+void MainWindow::mini_fader_changed(int bus, double volume_db)
+{
+       QString label(QString::fromStdString(format_db(volume_db, DB_WITH_SIGN)));
+       audio_miniviews[bus]->fader_label->setText(label);
+       audio_expanded_views[bus]->fader_label->setText(label);
+
+       global_audio_mixer->set_fader_volume(bus, volume_db);
+}
+
+void MainWindow::mute_button_toggled(int bus, bool checked)
+{
+       global_audio_mixer->set_mute(bus, checked);
+       midi_mapper.refresh_lights();
 }
 
 void MainWindow::reset_meters_button_clicked()
 {
-       global_mixer->reset_meters();
-       ui->peak_display->setText("-inf");
+       global_audio_mixer->reset_meters();
+       ui->peak_display->setText(QString::fromStdString(format_db(-HUGE_VAL, DB_WITH_SIGN | DB_BARE)));
        ui->peak_display->setStyleSheet("");
 }
 
-void MainWindow::audio_level_callback(float level_lufs, float peak_db, float global_level_lufs,
+void MainWindow::audio_level_callback(float level_lufs, float peak_db, vector<AudioMixer::BusLevel> bus_levels,
+                                      float global_level_lufs,
                                       float range_low_lufs, float range_high_lufs,
-                                      float gain_staging_db, float final_makeup_gain_db,
+                                      float final_makeup_gain_db,
                                       float correlation)
 {
-       timeval now;
-       gettimeofday(&now, nullptr);
+       steady_clock::time_point now = steady_clock::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-6 * (now.tv_usec - last_audio_level_callback.tv_usec);
+       // every 100 ms or so (we get updates every 5–20 ms). Note that this
+       // means that the digital peak meters are ever so slightly too low
+       // (each update won't be a faithful representation of the highest peak
+       // since the previous update, since there are frames we won't draw),
+       // but the _peak_ of the peak meters will be correct (it's tracked in
+       // AudioMixer, not here), and that's much more important.
+       double last_update_age = duration<double>(now - last_audio_level_callback).count();
        if (last_update_age < 0.100) {
                return;
        }
@@ -268,38 +877,73 @@ void MainWindow::audio_level_callback(float level_lufs, float peak_db, float glo
 
        post_to_main_thread([=]() {
                ui->vu_meter->set_level(level_lufs);
+               for (unsigned bus_index = 0; bus_index < bus_levels.size(); ++bus_index) {
+                       if (bus_index < audio_miniviews.size()) {
+                               const AudioMixer::BusLevel &level = bus_levels[bus_index];
+                               Ui::AudioMiniView *miniview = audio_miniviews[bus_index];
+                               miniview->peak_meter->set_level(
+                                       level.current_level_dbfs[0], level.current_level_dbfs[1]);
+                               miniview->peak_meter->set_peak(
+                                       level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
+                               set_peak_label(miniview->peak_display_label, level.historic_peak_dbfs);
+
+                               Ui::AudioExpandedView *view = audio_expanded_views[bus_index];
+                               view->peak_meter->set_level(
+                                       level.current_level_dbfs[0], level.current_level_dbfs[1]);
+                               view->peak_meter->set_peak(
+                                       level.peak_level_dbfs[0], level.peak_level_dbfs[1]);
+                               view->reduction_meter->set_reduction_db(level.compressor_attenuation_db);
+                               view->gainstaging_knob->blockSignals(true);
+                               view->gainstaging_knob->setValue(lrintf(level.gain_staging_db * 10.0f));
+                               view->gainstaging_knob->blockSignals(false);
+                               view->gainstaging_db_display->setText(
+                                       QString("Gain: ") +
+                                       QString::fromStdString(format_db(level.gain_staging_db, DB_WITH_SIGN)));
+                               set_peak_label(view->peak_display_label, level.historic_peak_dbfs);
+
+                               midi_mapper.set_has_peaked(bus_index, level.historic_peak_dbfs >= -0.1f);
+                       }
+               }
                ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
                ui->correlation_meter->set_correlation(correlation);
 
-               char buf[256];
-               snprintf(buf, sizeof(buf), "%.1f", peak_db);
-               ui->peak_display->setText(buf);
-               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->peak_display->setText(QString::fromStdString(format_db(peak_db, DB_BARE)));
+               set_peak_label(ui->peak_display, peak_db);
 
-               ui->gainstaging_knob->setValue(lrintf(gain_staging_db * 10.0f));
-               snprintf(buf, sizeof(buf), "%+.1f dB", gain_staging_db);
-               ui->gainstaging_db_display->setText(buf);
+               // NOTE: Will be invisible when using multitrack audio.
+               ui->gainstaging_knob->blockSignals(true);
+               ui->gainstaging_knob->setValue(lrintf(bus_levels[0].gain_staging_db * 10.0f));
+               ui->gainstaging_knob->blockSignals(false);
+               ui->gainstaging_db_display->setText(
+                       QString::fromStdString(format_db(bus_levels[0].gain_staging_db, DB_WITH_SIGN)));
 
+               ui->makeup_gain_knob->blockSignals(true);
                ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
-               snprintf(buf, sizeof(buf), "%+.1f dB", final_makeup_gain_db);
-               ui->makeup_gain_db_display->setText(buf);
+               ui->makeup_gain_knob->blockSignals(false);
+               ui->makeup_gain_db_display->setText(
+                       QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
+               ui->makeup_gain_db_display_2->setText(
+                       QString::fromStdString(format_db(final_makeup_gain_db, DB_WITH_SIGN)));
+
+               // Peak labels could have changed.
+               midi_mapper.refresh_lights();
        });
 }
 
 void MainWindow::relayout()
 {
        int height = ui->vertical_layout->geometry().height();
+       if (height <= 0) {
+               // Seemingly this can happen and must be ignored.
+               return;
+       }
 
        double remaining_height = height;
 
        // Allocate the height; the most important part is to keep the main displays
-       // at 16:9 if at all possible.
+       // at the right aspect if at all possible.
        double me_width = ui->me_preview->width();
-       double me_height = me_width * 9.0 / 16.0 + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
+       double me_height = me_width * double(global_flags.height) / double(global_flags.width) + ui->label_preview->height() + ui->preview_vertical_layout->spacing();
 
        // TODO: Scale the widths when we need to do this.
        if (me_height / double(height) > 0.8) {
@@ -307,30 +951,370 @@ void MainWindow::relayout()
        }
        remaining_height -= me_height + ui->vertical_layout->spacing();
 
-       double audiostrip_height = ui->audiostrip->geometry().height();
-       remaining_height -= audiostrip_height + ui->vertical_layout->spacing();
+       // Space between the M/E displays and the audio strip.
+       remaining_height -= ui->vertical_layout->spacing();
+
+       // The label above the audio strip.
+       double compact_label_height = ui->compact_label->minimumHeight() +
+               ui->compact_audio_layout->spacing();
+       remaining_height -= compact_label_height;
 
        // The previews will be constrained by the remaining height, and the width.
-       double preview_label_height = previews[0]->title_bar->geometry().height() +
+       double preview_label_height = previews[0]->label->minimumSize().height() +
                previews[0]->main_vertical_layout->spacing();
        int preview_total_width = ui->preview_displays->geometry().width() - (previews.size() - 1) * ui->preview_displays->spacing();
-       double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * 9.0 / 16.0);
+       double preview_height = min(remaining_height - preview_label_height, (preview_total_width / double(previews.size())) * double(global_flags.height) / double(global_flags.width));
        remaining_height -= preview_height + preview_label_height + ui->vertical_layout->spacing();
 
        ui->vertical_layout->setStretch(0, lrintf(me_height));
-       ui->vertical_layout->setStretch(1, 0);  // Don't stretch the audiostrip.
-       ui->vertical_layout->setStretch(2, max<int>(1, remaining_height));  // Spacer.
-       ui->vertical_layout->setStretch(3, lrintf(preview_height + preview_label_height));
+       ui->vertical_layout->setStretch(1,
+               lrintf(compact_label_height) +
+               lrintf(remaining_height) +
+               lrintf(preview_height + preview_label_height));  // Audio strip and previews together.
+
+       ui->compact_audio_layout->setStretch(0, lrintf(compact_label_height));
+       ui->compact_audio_layout->setStretch(1, lrintf(remaining_height));  // Audio strip.
+       ui->compact_audio_layout->setStretch(2, lrintf(preview_height + preview_label_height));
+
+       if (current_audio_view == 0) {  // Compact audio view.
+               // Set the widths for the previews.
+               double preview_width = preview_height * double(global_flags.width) / double(global_flags.height);
+               for (unsigned i = 0; i < previews.size(); ++i) {
+                       ui->preview_displays->setStretch(i, lrintf(preview_width));
+               }
+
+               // The preview horizontal spacer.
+               double remaining_preview_width = preview_total_width - previews.size() * preview_width;
+               ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
+       } else if (current_audio_view == 2) {  // Video grid view.
+               // QGridLayout doesn't do it for us, since we need to be able to remove rows
+               // or columns as the grid changes, and it won't do that. Thus, position everything
+               // by hand.
+               constexpr int spacing = 6;
+               int grid_width = ui->preview_displays_grid->geometry().width();
+               int grid_height = ui->preview_displays_grid->geometry().height();
+               int best_preview_width = 0;
+               unsigned best_num_rows = 1, best_num_cols = 1;
+               for (unsigned num_rows = 1; num_rows <= previews.size(); ++num_rows) {
+                       int num_cols = (previews.size() + num_rows - 1) / num_rows;
+
+                       int max_preview_height = (grid_height - spacing * (num_rows - 1)) / num_rows - preview_label_height;
+                       int max_preview_width = (grid_width - spacing * (num_cols - 1)) / num_cols;
+                       int preview_width = std::min<int>(max_preview_width, max_preview_height * double(global_flags.width) / double(global_flags.height));
+
+                       if (preview_width > best_preview_width) {
+                               best_preview_width = preview_width;
+                               best_num_rows = num_rows;
+                               best_num_cols = num_cols;
+                       }
+               }
+
+               double cell_height = lrintf(best_preview_width * double(global_flags.height) / double(global_flags.width)) + preview_label_height;
+               remaining_height = grid_height - best_num_rows * cell_height - (best_num_rows - 1) * spacing;
+               int cell_width = best_preview_width;
+               int remaining_width = grid_width - best_num_cols * cell_width - (best_num_cols - 1) * spacing;
+
+               for (unsigned i = 0; i < previews.size(); ++i) {
+                       int col_idx = i % best_num_cols;
+                       int row_idx = i / best_num_cols;
+
+                       double top = remaining_height * 0.5f + row_idx * (cell_height + spacing);
+                       double bottom = top + cell_height;
+                       double left = remaining_width * 0.5f + col_idx * (cell_width + spacing);
+                       double right = left + cell_width;
+
+                       QRect rect;
+                       rect.setTop(lrintf(top));
+                       rect.setBottom(lrintf(bottom));
+                       rect.setLeft(lrintf(left));
+                       rect.setRight(lrintf(right));
+
+                       QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
+                       display->setGeometry(rect);
+                       display->show();
+               }
+       }
+}
+
+void MainWindow::set_locut(float value)
+{
+       set_relative_value(ui->locut_cutoff_knob, value);
+}
+
+void MainWindow::set_limiter_threshold(float value)
+{
+       set_relative_value(ui->limiter_threshold_knob, value);
+}
+
+void MainWindow::set_makeup_gain(float value)
+{
+       set_relative_value(ui->makeup_gain_knob, value);
+}
+
+void MainWindow::set_treble(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, value);
+}
+
+void MainWindow::set_mid(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, value);
+}
+
+void MainWindow::set_bass(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, value);
+}
+
+void MainWindow::set_gain(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, value);
+}
+
+void MainWindow::set_compressor_threshold(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, value);
+}
+
+void MainWindow::set_fader(unsigned bus_idx, float value)
+{
+       set_relative_value_if_exists(bus_idx, &Ui::AudioExpandedView::fader, value);
+}
+
+void MainWindow::toggle_mute(unsigned bus_idx)
+{
+       click_button_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button);
+}
+
+void MainWindow::toggle_locut(unsigned bus_idx)
+{
+       click_button_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled);
+}
+
+void MainWindow::toggle_auto_gain_staging(unsigned bus_idx)
+{
+       click_button_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox);
+}
+
+void MainWindow::toggle_compressor(unsigned bus_idx)
+{
+       click_button_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled);
+}
+
+void MainWindow::clear_peak(unsigned bus_idx)
+{
+       post_to_main_thread([=]{
+               if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+                       global_audio_mixer->reset_peak(bus_idx);
+                       midi_mapper.set_has_peaked(bus_idx, false);
+                       midi_mapper.refresh_lights();
+               }
+       });
+}
+
+void MainWindow::clear_all_highlights()
+{
+       post_to_main_thread([this]{
+               highlight_locut(false);
+               highlight_limiter_threshold(false);
+               highlight_makeup_gain(false);
+               highlight_toggle_limiter(false);
+               highlight_toggle_auto_makeup_gain(false);
+               for (unsigned bus_idx = 0; bus_idx < audio_expanded_views.size(); ++bus_idx) {
+                       highlight_treble(bus_idx, false);
+                       highlight_mid(bus_idx, false);
+                       highlight_bass(bus_idx, false);
+                       highlight_gain(bus_idx, false);
+                       highlight_compressor_threshold(bus_idx, false);
+                       highlight_fader(bus_idx, false);
+                       highlight_mute(bus_idx, false);
+                       highlight_toggle_locut(bus_idx, false);
+                       highlight_toggle_auto_gain_staging(bus_idx, false);
+                       highlight_toggle_compressor(bus_idx, false);
+               }
+       });
+}
+
+void MainWindow::toggle_limiter()
+{
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+               ui->limiter_enabled->click();
+       }
+}
+
+void MainWindow::toggle_auto_makeup_gain()
+{
+       if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL) {
+               ui->makeup_gain_auto_checkbox->click();
+       }
+}
+
+void MainWindow::highlight_locut(bool highlight)
+{
+       post_to_main_thread([this, highlight]{
+               highlight_control(ui->locut_cutoff_knob, highlight);
+               highlight_control(ui->locut_cutoff_knob_2, highlight);
+       });
+}
+
+void MainWindow::highlight_limiter_threshold(bool highlight)
+{
+       post_to_main_thread([this, highlight]{
+               highlight_control(ui->limiter_threshold_knob, highlight);
+               highlight_control(ui->limiter_threshold_knob_2, highlight);
+       });
+}
+
+void MainWindow::highlight_makeup_gain(bool highlight)
+{
+       post_to_main_thread([this, highlight]{
+               highlight_control(ui->makeup_gain_knob, highlight);
+               highlight_control(ui->makeup_gain_knob_2, highlight);
+       });
+}
+
+void MainWindow::highlight_treble(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::treble_knob, highlight);
+}
+
+void MainWindow::highlight_mid(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mid_knob, highlight);
+}
+
+void MainWindow::highlight_bass(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::bass_knob, highlight);
+}
+
+void MainWindow::highlight_gain(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_knob, highlight);
+}
+
+void MainWindow::highlight_compressor_threshold(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_threshold_knob, highlight);
+}
+
+void MainWindow::highlight_fader(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::fader, highlight);
+}
+
+void MainWindow::highlight_mute(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::mute_button, highlight, /*is_mute_btton=*/true);
+}
+
+void MainWindow::highlight_toggle_locut(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::locut_enabled, highlight);
+}
+
+void MainWindow::highlight_toggle_auto_gain_staging(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::gainstaging_auto_checkbox, highlight);
+}
+
+void MainWindow::highlight_toggle_compressor(unsigned bus_idx, bool highlight)
+{
+       highlight_control_if_exists(bus_idx, &Ui::AudioExpandedView::compressor_enabled, highlight);
+}
+
+void MainWindow::highlight_toggle_limiter(bool highlight)
+{
+       post_to_main_thread([this, highlight]{
+               highlight_control(ui->limiter_enabled, highlight);
+               highlight_control(ui->limiter_enabled_2, highlight);
+       });
+}
 
-       // Set the widths for the previews.
-       double preview_width = preview_height * 16.0 / 9.0;
-       for (unsigned i = 0; i < previews.size(); ++i) {
-               ui->preview_displays->setStretch(i, lrintf(preview_width));
+void MainWindow::highlight_toggle_auto_makeup_gain(bool highlight)
+{
+       post_to_main_thread([this, highlight]{
+               highlight_control(ui->makeup_gain_auto_checkbox, highlight);
+               highlight_control(ui->makeup_gain_auto_checkbox_2, highlight);
+       });
+}
+
+template<class T>
+void MainWindow::set_relative_value(T *control, float value)
+{
+       post_to_main_thread([control, value]{
+               control->setValue(lrintf(control->minimum() + value * (control->maximum() - control->minimum())));
+       });
+}
+
+template<class T>
+void MainWindow::set_relative_value_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), float value)
+{
+       if (global_audio_mixer != nullptr &&
+           global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
+           bus_idx < audio_expanded_views.size()) {
+               set_relative_value(audio_expanded_views[bus_idx]->*control, value);
        }
+}
+
+template<class T>
+void MainWindow::click_button_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control))
+{
+       post_to_main_thread([this, bus_idx, control]{
+               if (global_audio_mixer != nullptr &&
+                   global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::MULTICHANNEL &&
+                   bus_idx < audio_expanded_views.size()) {
+                       (audio_expanded_views[bus_idx]->*control)->click();
+               }
+       });
+}
 
-       // The preview horizontal spacer.
-       double remaining_preview_width = preview_total_width - previews.size() * preview_width;
-       ui->preview_displays->setStretch(previews.size(), lrintf(remaining_preview_width));
+template<class T>
+void MainWindow::highlight_control(T *control, bool highlight)
+{
+       if (control == nullptr) {
+               return;
+       }
+       if (global_audio_mixer == nullptr ||
+           global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
+               highlight = false;
+       }
+       if (highlight) {
+               control->setStyleSheet("background: rgb(0,255,0,80)");
+       } else {
+               control->setStyleSheet("");
+       }
+}
+
+template<class T>
+void MainWindow::highlight_mute_control(T *control, bool highlight)
+{
+       if (control == nullptr) {
+               return;
+       }
+       if (global_audio_mixer == nullptr ||
+           global_audio_mixer->get_mapping_mode() != AudioMixer::MappingMode::MULTICHANNEL) {
+               highlight = false;
+       }
+       if (highlight) {
+               control->setStyleSheet("QPushButton { background: rgb(0,255,0,80); } QPushButton:checked { background: rgba(255,80,0,140); }");
+       } else {
+               control->setStyleSheet("QPushButton:checked { background: rgba(255,0,0,80); }");
+       }
+}
+
+template<class T>
+void MainWindow::highlight_control_if_exists(unsigned bus_idx, T *(Ui_AudioExpandedView::*control), bool highlight, bool is_mute_button)
+{
+       post_to_main_thread([this, bus_idx, control, highlight, is_mute_button]{
+               if (bus_idx < audio_expanded_views.size()) {
+                       if (is_mute_button) {
+                               highlight_mute_control(audio_expanded_views[bus_idx]->*control, highlight);
+                       } else {
+                               highlight_control(audio_expanded_views[bus_idx]->*control, highlight);
+                       }
+               }
+       });
 }
 
 void MainWindow::set_transition_names(vector<string> transition_names)
@@ -361,6 +1345,8 @@ void MainWindow::update_channel_name(Mixer::Output output, const string &name)
                unsigned channel = output - Mixer::OUTPUT_INPUT0;
                previews[channel]->label->setText(name.c_str());
        }
+
+       analyzer->update_channel_name(output, name);
 }
 
 void MainWindow::update_channel_color(Mixer::Output output, const string &color)
@@ -386,12 +1372,49 @@ void MainWindow::channel_clicked(int channel_number)
        }
 }
 
+void MainWindow::quick_cut_activated(int channel_number)
+{
+       if (!global_flags.enable_quick_cut_keys) {
+               return;
+       }
+       global_mixer->channel_clicked(channel_number);
+       global_mixer->transition_clicked(0);
+}
+
 void MainWindow::wb_button_clicked(int channel_number)
 {
        current_wb_pick_display = channel_number;
        QApplication::setOverrideCursor(Qt::CrossCursor);
 }
 
+void MainWindow::audio_view_changed(int audio_view)
+{
+       if (audio_view == current_audio_view) {
+               return;
+       }
+
+       if (audio_view == 0) {
+               // Compact audio view. (1, full audio view, has no video previews.)
+               for (unsigned i = 0; i < previews.size(); ++i) {
+                       QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
+                       ui->preview_displays->insertWidget(i, display, 1);
+               }
+       } else if (audio_view == 2) {
+               // Video grid display.
+               for (unsigned i = 0; i < previews.size(); ++i) {
+                       QWidget *display = static_cast<QWidget *>(previews[i]->frame->parent());
+                       display->setParent(ui->preview_displays_grid);
+                       display->show();
+               }
+       }
+
+       current_audio_view = audio_view;
+
+       // Ask for a relayout, but only after the event loop is done doing relayout
+       // on everything else.
+       QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
+}
+
 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 {
        if (current_wb_pick_display != -1 &&
@@ -410,6 +1433,22 @@ bool MainWindow::eventFilter(QObject *watched, QEvent *event)
        return false;
 }
 
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+       if (global_mixer->get_num_connected_clients() > 0) {
+               QMessageBox::StandardButton reply =
+                       QMessageBox::question(this, "Nageru", "There are clients connected. Do you really want to quit?",
+                               QMessageBox::Yes | QMessageBox::No);
+               if (reply != QMessageBox::Yes) {
+                       event->ignore();
+                       return;
+               }
+       }
+
+       analyzer->hide();
+       event->accept();
+}
+
 namespace {
 
 double srgb_to_linear(double x)
@@ -437,3 +1476,30 @@ void MainWindow::set_white_balance(int channel_number, int x, int y)
        global_mixer->set_wb(Mixer::OUTPUT_INPUT0 + channel_number, r, g, b);
        previews[channel_number]->display->updateGL();
 }
+
+void MainWindow::audio_state_changed()
+{
+       post_to_main_thread([this]{
+               if (global_audio_mixer->get_mapping_mode() == AudioMixer::MappingMode::SIMPLE) {
+                       return;
+               }
+               InputMapping mapping = global_audio_mixer->get_input_mapping();
+               for (unsigned bus_index = 0; bus_index < mapping.buses.size(); ++bus_index) {
+                       const InputMapping::Bus &bus = mapping.buses[bus_index];
+                       string suffix;
+                       if (bus.device.type == InputSourceType::ALSA_INPUT) {
+                               ALSAPool::Device::State state = global_audio_mixer->get_alsa_card_state(bus.device.index);
+                               if (state == ALSAPool::Device::State::STARTING) {
+                                       suffix = " (busy)";
+                               } else if (state == ALSAPool::Device::State::DEAD) {
+                                       suffix = " (dead)";
+                               }
+                       }
+
+                       audio_miniviews[bus_index]->bus_desc_label->setFullText(
+                               QString::fromStdString(bus.name + suffix));
+                       audio_expanded_views[bus_index]->bus_desc_label->setFullText(
+                               QString::fromStdString(bus.name + suffix));
+               }
+       });
+}