oak-editor/app/widget/viewer/viewer.cpp

/*
 * Olive Community Edition - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "viewer.h"

#include <QDateTime>
#include <QFontDialog>
#include <QGuiApplication>
#include <QInputDialog>
#include <QLabel>
#include <QMessageBox>
#include <QResizeEvent>
#include <QScreen>
#include <QtMath>
#include <QVBoxLayout>

#include "audio/audiomanager.h"
#include "common/ratiodialog.h"
#include "config/config.h"
#include "core.h"
#include "node/block/gap/gap.h"
#include "node/generator/shape/shapenodebase.h"
#include "node/nodeundo.h"
#include "node/project.h"
#include "panel/multicam/multicampanel.h"
#include "panel/panelmanager.h"
#include "render/rendermanager.h"
#include "viewerpreventsleep.h"
#include "widget/audiomonitor/audiomonitor.h"
#include "widget/menu/menu.h"
#include "widget/multicam/multicamdisplay.h"
#include "widget/timelinewidget/tool/add.h"
#include "widget/timeruler/timeruler.h"

namespace olive
{

#define super TimeBasedWidget

QVector<ViewerWidget *> ViewerWidget::instances_;

// NOTE: Hardcoded interval of size of audio chunk to render and send to the output at a time.
//       We want this to be as long as possible so the code has plenty of time to send the audio
//       while also being as short as possible so users get relatively immediate feedback when
//       changing values. 1/4 second seems to be a good middleground.
const rational ViewerWidget::kAudioPlaybackInterval = rational(1, 4);

const rational kVideoPlaybackInterval = rational(1, 2);

ViewerWidget::ViewerWidget(ViewerDisplayWidget *display, QWidget *parent)
	: super(false, true, parent)
	, playback_speed_(0)
	, color_menu_enabled_(true)
	, time_changed_from_timer_(false)
	, prequeuing_video_(false)
	, prequeuing_audio_(0)
	, record_armed_(false)
	, recording_(false)
	, first_requeue_watcher_(nullptr)
	, enable_audio_scrubbing_(true)
	, waveform_mode_(kWFAutomatic)
	, ignore_scrub_(0)
	, multicam_panel_(nullptr)
{
	// Set up main layout
	QVBoxLayout *layout = new QVBoxLayout(this);
	layout->setContentsMargins(0, 0, 0, 0);

	// Create main OpenGL-based view and sizer
	sizer_ = new ViewerSizer();
	layout->addWidget(sizer_);

	display_widget_ = display;
	display_widget_->SetShowWidgetBackground(true);
	playback_devices_.append(display_widget_);
	connect(display_widget_, &ViewerDisplayWidget::customContextMenuRequested,
			this, &ViewerWidget::ShowContextMenu);
	connect(display_widget_, &ViewerDisplayWidget::CursorColor, this,
			&ViewerWidget::CursorColor);
	connect(display_widget_, &ViewerDisplayWidget::ColorProcessorChanged, this,
			&ViewerWidget::ColorProcessorChanged);
	connect(display_widget_, &ViewerDisplayWidget::ColorManagerChanged, this,
			&ViewerWidget::ColorManagerChanged);
	connect(display_widget_, &ViewerDisplayWidget::DragEntered, this,
			&ViewerWidget::DragEntered);
	connect(display_widget_, &ViewerDisplayWidget::Dropped, this,
			&ViewerWidget::Dropped);
	connect(display_widget_, &ViewerDisplayWidget::TextureChanged, this,
			&ViewerWidget::TextureChanged);
	connect(display_widget_, &ViewerDisplayWidget::QueueStarved, this,
			&ViewerWidget::QueueStarved);
	connect(display_widget_, &ViewerDisplayWidget::QueueNoLongerStarved, this,
			&ViewerWidget::QueueNoLongerStarved);
	connect(display_widget_, &ViewerDisplayWidget::CreateAddableAt, this,
			&ViewerWidget::CreateAddableAt);
	connect(sizer_, &ViewerSizer::RequestScale, display_widget_,
			&ViewerDisplayWidget::SetMatrixZoom);
	connect(sizer_, &ViewerSizer::RequestTranslate, display_widget_,
			&ViewerDisplayWidget::SetMatrixTranslate);
	connect(display_widget_, &ViewerDisplayWidget::HandDragMoved, sizer_,
			&ViewerSizer::HandDragMove);
	sizer_->SetWidget(display_widget_);

	// Make the display widget the first tabbable widget. While the viewer display cannot actually
	// be interacted with by tabbing, it prevents the actual first tabbable widget (the playhead
	// slider in `controls_`) from getting auto-focused any time the panel is maximized (with `)
	display_widget_->setFocusPolicy(Qt::TabFocus);

	// Create waveform view when audio is connected and video isn't
	waveform_view_ = new AudioWaveformView();
	ConnectTimelineView(waveform_view_);
	layout->addWidget(waveform_view_);

	// Create time ruler
	layout->addWidget(ruler());

	// Create scrollbar
	layout->addWidget(scrollbar());

	// Create lower controls
	controls_ = new PlaybackControls();
	controls_->SetTimecodeEnabled(true);
	controls_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
	connect(controls_, &PlaybackControls::PlayClicked, this,
			static_cast<void (ViewerWidget::*)()>(&ViewerWidget::Play));
	connect(controls_, &PlaybackControls::PauseClicked, this,
			&ViewerWidget::Pause);
	connect(controls_, &PlaybackControls::PrevFrameClicked, this,
			&ViewerWidget::PrevFrame);
	connect(controls_, &PlaybackControls::NextFrameClicked, this,
			&ViewerWidget::NextFrame);
	connect(controls_, &PlaybackControls::BeginClicked, this,
			&ViewerWidget::GoToStart);
	connect(controls_, &PlaybackControls::EndClicked, this,
			&ViewerWidget::GoToEnd);
	layout->addWidget(controls_);

	// FIXME: Magic number
	SetScale(48.0);

	// Ensures that seeking on the waveform view updates the time as expected
	connect(waveform_view_, &AudioWaveformView::customContextMenuRequested,
			this, &ViewerWidget::ShowContextMenu);

	connect(&playback_backup_timer_, &QTimer::timeout, this,
			&ViewerWidget::PlaybackTimerUpdate);

	SetAutoMaxScrollBar(true);

	instances_.append(this);

	UpdateWaveformViewFromMode();

	connect(Core::instance(), &Core::ColorPickerEnabled, this,
			&ViewerWidget::SetSignalCursorColorEnabled);
	connect(this, &ViewerWidget::CursorColor, Core::instance(),
			&Core::ColorPickerColorEmitted);
	connect(AudioManager::instance(), &AudioManager::OutputParamsChanged, this,
			&ViewerWidget::UpdateAudioProcessor);
}

ViewerWidget::~ViewerWidget()
{
	instances_.removeOne(this);

	auto windows = windows_;

	foreach (ViewerWindow *window, windows) {
		delete window;
	}

	delete display_widget_;
	display_widget_ = nullptr;
}

void ViewerWidget::TimeChangedEvent(const rational &time)
{
	if (!time_changed_from_timer_) {
		PauseInternal();
	}

	if (record_armed_) {
		DisarmRecording();
	}

	controls_->SetTime(time);

	if (GetConnectedNode() && last_time_ != time) {
		if (!IsPlaying()) {
			UpdateTextureFromNode();

			PushScrubbedAudio();

			// We don't clear the FPS timer on pause in case users want to see it immediately after, but by
			// the time a new texture is drawn, assume that the FPS no longer needs to be shown.
			display_widget_->ResetFPSTimer();
		}

		display_widget_->SetTime(time);
	}

	// Send time to auto-cacher
	RenderManager::instance()->GetCacher()->SetPlayhead(time);

	last_time_ = time;
}

void ViewerWidget::ConnectNodeEvent(ViewerOutput *n)
{
	connect(n, &ViewerOutput::SizeChanged, this,
			&ViewerWidget::SetViewerResolution);
	connect(n, &ViewerOutput::PixelAspectChanged, this,
			&ViewerWidget::SetViewerPixelAspect);
	connect(n, &ViewerOutput::LengthChanged, this,
			&ViewerWidget::LengthChangedSlot);
	connect(n, &ViewerOutput::InterlacingChanged, this,
			&ViewerWidget::InterlacingChangedSlot);
	connect(n, &ViewerOutput::VideoParamsChanged, this,
			&ViewerWidget::UpdateRendererVideoParameters);
	connect(n, &ViewerOutput::VideoParamsChanged, this,
			&ViewerWidget::UpdateTextureFromNode, Qt::QueuedConnection);
	connect(n, &ViewerOutput::AudioParamsChanged, this,
			&ViewerWidget::UpdateRendererAudioParameters);
	connect(n->video_frame_cache(), &FrameHashCache::Invalidated, this,
			&ViewerWidget::ViewerInvalidatedVideoRange);
	connect(n, &ViewerOutput::TextureInputChanged, this,
			&ViewerWidget::UpdateWaveformViewFromMode);

	connect(controls_, &PlaybackControls::TimeChanged, n,
			&ViewerOutput::SetPlayhead);

	VideoParams vp = n->GetVideoParams();

	InterlacingChangedSlot(vp.interlacing());

	ruler()->SetPlaybackCache(n->video_frame_cache());

	SetViewerResolution(vp.width(), vp.height());
	SetViewerPixelAspect(vp.pixel_aspect_ratio());
	last_length_ = 0;
	LengthChangedSlot(n->GetLength());

	UpdateAudioProcessor();

	ColorManager *color_manager = n->project()->color_manager();

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->ConnectColorManager(color_manager);
	}

	UpdateWaveformViewFromMode();

	waveform_view_->SetViewer(GetConnectedNode());

	UpdateRendererVideoParameters();
	UpdateRendererAudioParameters();

	// Set texture to new texture (or null if no viewer node is available)
	UpdateTextureFromNode();
}

void ViewerWidget::DisconnectNodeEvent(ViewerOutput *n)
{
	PauseInternal();

	disconnect(n, &ViewerOutput::SizeChanged, this,
			   &ViewerWidget::SetViewerResolution);
	disconnect(n, &ViewerOutput::PixelAspectChanged, this,
			   &ViewerWidget::SetViewerPixelAspect);
	disconnect(n, &ViewerOutput::LengthChanged, this,
			   &ViewerWidget::LengthChangedSlot);
	disconnect(n, &ViewerOutput::InterlacingChanged, this,
			   &ViewerWidget::InterlacingChangedSlot);
	disconnect(n, &ViewerOutput::VideoParamsChanged, this,
			   &ViewerWidget::UpdateRendererVideoParameters);
	disconnect(n, &ViewerOutput::VideoParamsChanged, this,
			   &ViewerWidget::UpdateTextureFromNode);
	disconnect(n, &ViewerOutput::AudioParamsChanged, this,
			   &ViewerWidget::UpdateRendererAudioParameters);
	disconnect(n->video_frame_cache(), &FrameHashCache::Invalidated, this,
			   &ViewerWidget::ViewerInvalidatedVideoRange);
	disconnect(n, &ViewerOutput::TextureInputChanged, this,
			   &ViewerWidget::UpdateWaveformViewFromMode);

	disconnect(controls_, &PlaybackControls::TimeChanged, n,
			   &ViewerOutput::SetPlayhead);

	timeline_selected_blocks_.clear();
	node_view_selected_.clear();
	if (multicam_panel_) {
		multicam_panel_->SetMulticamNode(nullptr, nullptr, nullptr,
										 rational::NaN);
	}

	CloseAudioProcessor();
	audio_scrub_watchers_.clear();

	SetDisplayImage(nullptr);

	ruler()->SetPlaybackCache(nullptr);

	// Effectively disables the viewer and clears the state
	SetViewerResolution(0, 0);

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->DisconnectColorManager();
	}

	waveform_view_->SetViewer(nullptr);

	// Queue an UpdateStack so that when it runs, the viewer node will be fully disconnected
	QMetaObject::invokeMethod(this, &ViewerWidget::UpdateWaveformViewFromMode,
							  Qt::QueuedConnection);

	SetGizmos(nullptr);
}

void ViewerWidget::ConnectedNodeChangeEvent(ViewerOutput *n)
{
	display_widget_->SetSubtitleTracks(dynamic_cast<Sequence *>(n));
}

void ViewerWidget::ConnectedWorkAreaChangeEvent(TimelineWorkArea *workarea)
{
	waveform_view_->SetWorkArea(workarea);
}

void ViewerWidget::ConnectedMarkersChangeEvent(TimelineMarkerList *markers)
{
	waveform_view_->SetMarkers(markers);
}

void ViewerWidget::ScaleChangedEvent(const double &s)
{
	super::ScaleChangedEvent(s);

	waveform_view_->SetScale(s);
}

void ViewerWidget::resizeEvent(QResizeEvent *event)
{
	super::resizeEvent(event);

	UpdateMinimumScale();
}

RenderTicketPtr ViewerWidget::GetSingleFrame(const rational &t, bool dry)
{
	return RenderManager::instance()->GetCacher()->GetSingleFrame(
		this->GetConnectedNode(), t, dry);
}

void ViewerWidget::TogglePlayPause()
{
	if (IsPlaying()) {
		Pause();
	} else {
		Play();
	}
}

bool ViewerWidget::IsPlaying() const
{
	return playback_speed_ != 0;
}

void ViewerWidget::SetColorMenuEnabled(bool enabled)
{
	color_menu_enabled_ = enabled;
}

void ViewerWidget::SetMatrix(const QMatrix4x4 &mat)
{
	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetMatrixCrop(mat);
	}
}

void ViewerWidget::SetFullScreen(QScreen *screen)
{
	if (!screen) {
		// Try to find the screen that contains the mouse cursor currently
		foreach (QScreen *test, QGuiApplication::screens()) {
			if (test->geometry().contains(QCursor::pos())) {
				screen = test;
				break;
			}
		}

		// Fallback, just use the first screen
		if (!screen) {
			screen = QGuiApplication::screens().first();
		}
	}

	if (windows_.contains(screen)) {
		ViewerWindow *vw = windows_.take(screen);
		vw->deleteLater();
		return;
	}

	ViewerWindow *vw = new ViewerWindow(this);

	vw->setGeometry(screen->geometry());
	vw->showFullScreen();
	vw->display_widget()->ConnectColorManager(color_manager());
	connect(vw, &ViewerWindow::destroyed, this,
			&ViewerWidget::WindowAboutToClose);
	connect(vw->display_widget(),
			&ViewerDisplayWidget::customContextMenuRequested, this,
			&ViewerWidget::ShowContextMenu);

	if (GetConnectedNode()) {
		vw->SetVideoParams(GetConnectedNode()->GetVideoParams());
		vw->display_widget()->SetDeinterlacing(
			vw->display_widget()->IsDeinterlacing());
	}

	vw->display_widget()->SetImage(
		QVariant::fromValue(display_widget()->GetCurrentTexture()));

	playback_devices_.append(vw->display_widget());

	(*vw->display_widget()->queue()) = *playback_devices_.first()->queue();
	if (IsPlaying()) {
		vw->display_widget()->Play(GetTimestamp(), playback_speed_, timebase(),
								   true);
	}

	windows_.insert(screen, vw);
}

void ViewerWidget::CacheEntireSequence()
{
	RenderManager::instance()->GetCacher()->ForceCacheRange(
		GetConnectedNode(), TimeRange(0, GetConnectedNode()->GetVideoLength()));
}

void ViewerWidget::CacheSequenceInOut()
{
	if (GetConnectedNode() && GetConnectedNode()->GetWorkArea()->enabled()) {
		RenderManager::instance()->GetCacher()->ForceCacheRange(
			GetConnectedNode(), GetConnectedNode()->GetWorkArea()->range());
	} else {
		QMessageBox::warning(this, tr("Error"),
							 tr("No in or out points are set to cache."),
							 QMessageBox::Ok);
	}
}

void ViewerWidget::SetGizmos(Node *node)
{
	display_widget_->SetTimeTarget(GetConnectedNode());
	display_widget_->SetGizmos(node);
}

void ViewerWidget::StartCapture(TimelineWidget *source, const TimeRange &time,
								const Track::Reference &track)
{
	GetConnectedNode()->SetPlayhead(time.in());
	ArmForRecording();

	recording_callback_ = source;
	recording_range_ = time;
	recording_track_ = track;
}

void ViewerWidget::ConnectMulticamWidget(MulticamWidget *p)
{
	if (multicam_panel_) {
		disconnect(multicam_panel_, &MulticamWidget::Switched, this,
				   &ViewerWidget::DetectMulticamNodeNow);
	}

	multicam_panel_ = p;

	if (multicam_panel_) {
		connect(multicam_panel_, &MulticamWidget::Switched, this,
				&ViewerWidget::DetectMulticamNodeNow);
	}
}

FramePtr ViewerWidget::DecodeCachedImage(const QString &cache_path,
										 const QUuid &cache_id,
										 const int64_t &time)
{
	FramePtr frame = FrameHashCache::LoadCacheFrame(cache_path, cache_id, time);

	if (frame) {
		frame->set_timestamp(time);
	} else {
		qWarning() << "Tried to load cached frame from file but it was null";
	}

	return frame;
}

void ViewerWidget::DecodeCachedImage(RenderTicketPtr ticket,
									 const QString &cache_path,
									 const QUuid &cache_id, const int64_t &time)
{
	ticket->Start();

	FramePtr f = DecodeCachedImage(cache_path, cache_id, time);

	if (f) {
		ticket->Finish(QVariant::fromValue(f));
	} else {
		ticket->Finish();
	}
}

bool ViewerWidget::ShouldForceWaveform() const
{
	return GetConnectedNode() &&
		   !GetConnectedNode()->GetConnectedTextureOutput() &&
		   GetConnectedNode()->GetConnectedSampleOutput();
}

void ViewerWidget::SetEmptyImage()
{
	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetBlank();
	}
}

void ViewerWidget::UpdateAutoCacher()
{
	RenderManager::instance()->GetCacher()->SetPlayhead(
		GetConnectedNode()->GetPlayhead());
}

void ViewerWidget::DecrementPrequeuedAudio()
{
	prequeuing_audio_--;
	if (!prequeuing_audio_) {
		FinishPlayPreprocess();
	}
}

void ViewerWidget::ArmForRecording()
{
	controls_->StartPlayBlink();
	record_armed_ = true;
}

void ViewerWidget::DisarmRecording()
{
	controls_->StopPlayBlink();
	record_armed_ = false;
}

void ViewerWidget::UpdateAudioProcessor()
{
	if (GetConnectedNode()) {
		CloseAudioProcessor();

		AudioParams ap = GetConnectedNode()->GetAudioParams();
		ap.set_format(ViewerOutput::kDefaultSampleFormat);

		uint64_t layout =
			OLIVE_CONFIG("AudioOutputChannelLayout").toULongLong();
		AudioParams packed(
			OLIVE_CONFIG("AudioOutputSampleRate").toInt(),
			OLIVE_CONFIG("AudioOutputChannelLayout").toULongLong(),
			SampleFormat::from_string(OLIVE_CONFIG("AudioOutputSampleFormat")
										  .toString()
										  .toStdString()));

		audio_processor_.Open(
			ap, packed, (playback_speed_ == 0) ? 1 : std::abs(playback_speed_));
	}
}

void ViewerWidget::CreateAddableAt(const QRectF &f)
{
	if (Sequence *s = dynamic_cast<Sequence *>(GetConnectedNode())) {
		Track::Type type = Track::kVideo;
		int track_index = -1;
		TrackList *list = s->track_list(type);
		const rational &in = GetConnectedNode()->GetPlayhead();
		rational length = OLIVE_CONFIG("DefaultStillLength").value<rational>();
		rational out = in + length;

		// Find a free track where we won't overwrite anything
		while (true) {
			track_index++;

			if (track_index >= list->GetTrackCount()) {
				// Just create a new track
				break;
			}

			Track *track = list->GetTrackAt(track_index);
			if (track->IsLocked()) {
				continue;
			}

			Block *b = track->NearestBlockBeforeOrAt(in);
			if (!b || (dynamic_cast<GapBlock *>(b) && b->out() >= out)) {
				break;
			}
		}

		MultiUndoCommand *command = new MultiUndoCommand();
		Node *clip = AddTool::CreateAddableClip(
			command, s, Track::Reference(type, track_index), in, length);

		if (ShapeNodeBase *shape = dynamic_cast<ShapeNodeBase *>(clip)) {
			shape->SetRect(f, s->GetVideoParams(), command);
		}

		Core::instance()->undo_stack()->push(command, tr("Created Shape"));
		SetGizmos(clip);
	}
}

void ViewerWidget::HandleFirstRequeueDestroy()
{
	// Extra protection to ensure we don't reference a destroyed object
	if (first_requeue_watcher_ == sender()) {
		first_requeue_watcher_ = nullptr;
	}
}

void ViewerWidget::ShowSubtitleProperties()
{
	QFont f(OLIVE_CONFIG("DefaultSubtitleFamily").toString(),
			OLIVE_CONFIG("DefaultSubtitleSize").toInt(),
			OLIVE_CONFIG("DefaultSubtitleWeight").toInt());
	QFontDialog fd(f, this);

	if (fd.exec() == QDialog::Accepted) {
		f = fd.selectedFont();
		OLIVE_CONFIG("DefaultSubtitleSize") = f.pointSize();
		OLIVE_CONFIG("DefaultSubtitleFamily") = f.family();
		OLIVE_CONFIG("DefaultSubtitleWeight") = f.weight();
		display_widget_->update();
	}
}

void ViewerWidget::DryRunFinished()
{
	RenderTicketWatcher *w = static_cast<RenderTicketWatcher *>(sender());

	if (dry_run_watchers_.contains(w)) {
		RequestNextDryRun();
	}

	delete w;
}

void ViewerWidget::RequestNextDryRun()
{
	if (IsPlaying()) {
		rational next_time =
			Timecode::timestamp_to_time(dry_run_next_frame_, timebase());
		if (FrameExistsAtTime(next_time)) {
			if (next_time > GetConnectedNode()->GetPlayhead() +
								RenderManager::kDryRunInterval) {
				QTimer::singleShot(timebase().toDouble() / playback_speed_,
								   this, &ViewerWidget::RequestNextDryRun);
			} else {
				RenderTicketWatcher *watcher = new RenderTicketWatcher(this);
				connect(watcher, &RenderTicketWatcher::Finished, this,
						&ViewerWidget::DryRunFinished);
				watcher->SetTicket(GetSingleFrame(next_time, true));
				dry_run_next_frame_ += playback_speed_;
				dry_run_watchers_.append(watcher);
			}
		}
	}
}

void ViewerWidget::SaveFrameAsImage()
{
	Core::instance()->OpenExportDialogForViewer(GetConnectedNode(), true);
}

void ViewerWidget::DetectMulticamNodeNow()
{
	if (GetConnectedNode()) {
		DetectMulticamNode(GetConnectedNode()->GetPlayhead());
	}
}

void ViewerWidget::CloseAudioProcessor()
{
	audio_processor_.Close();
}

void ViewerWidget::SetWaveformMode(WaveformMode wf)
{
	waveform_mode_ = wf;
	UpdateWaveformViewFromMode();
}

void ViewerWidget::DetectMulticamNode(const rational &time)
{
	// Look for multicam node
	MultiCamNode *multicam = nullptr;
	ClipBlock *clip = nullptr;

	// Faster way to do this
	if (multicam_panel_ && multicam_panel_->isVisible()) {
		if (Sequence *s = dynamic_cast<Sequence *>(GetConnectedNode())) {
			// Prefer selected nodes
			for (Node *n : qAsConst(node_view_selected_)) {
				if ((multicam = dynamic_cast<MultiCamNode *>(n))) {
					// Found multicam, now try to find corresponding clip from selected timeline blocks
					for (Block *b : qAsConst(timeline_selected_blocks_)) {
						if (ClipBlock *c = dynamic_cast<ClipBlock *>(b)) {
							if (c->range().Contains(time) &&
								c->ContextContainsNode(multicam)) {
								clip = c;
								break;
							}
						}
					}
					break;
				}
			}

			// Next, prefer multicam from selected block
			if (!multicam) {
				for (Block *b : qAsConst(timeline_selected_blocks_)) {
					if (b->range().Contains(time)) {
						if ((clip = dynamic_cast<ClipBlock *>(b))) {
							if ((multicam = clip->FindMulticam())) {
								break;
							}
						}
					}
				}
			}

			if (!multicam) {
				const QVector<Track *> &tracks = s->GetTracks();
				for (Track *t : tracks) {
					if (t->IsLocked()) {
						continue;
					}

					Block *b = t->NearestBlockBeforeOrAt(time);
					if ((clip = dynamic_cast<ClipBlock *>(b))) {
						if ((multicam = clip->FindMulticam())) {
							break;
						}
					}
				}
			}
		}
	}

	if (multicam) {
		if (multicam_panel_) {
			multicam_panel_->SetMulticamNode(GetConnectedNode(), multicam, clip,
											 time);
		}
		// FIXME: Really dirty
		RenderManager::instance()->GetCacher()->SetMulticamNode(multicam);
	} else {
		RenderManager::instance()->GetCacher()->SetMulticamNode(nullptr);
		if (multicam_panel_) {
			multicam_panel_->SetMulticamNode(nullptr, nullptr, nullptr, time);
		}
	}
}

bool ViewerWidget::IsVideoVisible() const
{
	return GetConnectedNode()->GetVideoParams().video_type() !=
			   VideoParams::kVideoTypeStill &&
		   (display_widget_->isVisible() || !windows_.isEmpty());
}

void ViewerWidget::UpdateWaveformViewFromMode()
{
	bool prefer_waveform = ShouldForceWaveform();

	sizer_->setVisible(waveform_mode_ == kWFViewerAndWaveform ||
					   waveform_mode_ == kWFViewerOnly ||
					   (waveform_mode_ == kWFAutomatic && !prefer_waveform));
	waveform_view_->setVisible(
		waveform_mode_ == kWFViewerAndWaveform ||
		waveform_mode_ == kWFWaveformOnly ||
		(waveform_mode_ == kWFAutomatic && prefer_waveform));

	waveform_view_->setSizePolicy(QSizePolicy::Expanding,
								  waveform_mode_ == kWFViewerAndWaveform ?
									  QSizePolicy::Maximum :
									  QSizePolicy::Expanding);

	if (GetConnectedNode()) {
		GetConnectedNode()->SetWaveformEnabled(waveform_view_->isVisible());
	}
}

void ViewerWidget::QueueNextAudioBuffer()
{
	rational queue_end =
		audio_playback_queue_time_ + (kAudioPlaybackInterval * playback_speed_);

	// Clamp queue end by zero and the audio length
	queue_end = std::clamp(queue_end, rational(0),
						   GetConnectedNode()->GetAudioLength());
	if ((playback_speed_ > 0 && queue_end <= audio_playback_queue_time_) ||
		(playback_speed_ < 0 && queue_end >= audio_playback_queue_time_)) {
		// This will queue nothing, so stop the loop here
		if (prequeuing_audio_) {
			DecrementPrequeuedAudio();
		}
		return;
	}

	RenderTicketWatcher *watcher = new RenderTicketWatcher(this);
	connect(watcher, &RenderTicketWatcher::Finished, this,
			&ViewerWidget::ReceivedAudioBufferForPlayback);
	audio_playback_queue_.push_back(watcher);
	watcher->SetTicket(RenderManager::instance()->GetCacher()->GetRangeOfAudio(
		GetConnectedNode(), TimeRange(audio_playback_queue_time_, queue_end)));

	audio_playback_queue_time_ = queue_end;
}

void ViewerWidget::ReceivedAudioBufferForPlayback()
{
	while (!audio_playback_queue_.empty() &&
		   audio_playback_queue_.front()->HasResult()) {
		RenderTicketWatcher *watcher = audio_playback_queue_.front();
		audio_playback_queue_.pop_front();

		if (watcher->HasResult()) {
			SampleBuffer samples = watcher->Get().value<SampleBuffer>();
			if (samples.is_allocated()) {
				// If the samples must be reversed, reverse them now
				if (playback_speed_ < 0) {
					samples.reverse();
				}

				// Convert to packed data for audio output
				AudioProcessor::Buffer buf;
				int r = audio_processor_.Convert(samples.to_raw_ptrs().data(),
												 samples.sample_count(), &buf);

				// TempoProcessor may have emptied the array
				if (r >= 0) {
					if (!buf.empty()) {
						const QByteArray &pack = buf.at(0);
						if (prequeuing_audio_) {
							// Add to prequeued audio buffer
							prequeued_audio_.append(pack);
						} else {
							// Push directly to audio manager
							AudioManager::instance()->PushToOutput(
								audio_processor_.to(), pack);
						}
					}
				} else {
					qCritical() << "Failed to process audio for playback:" << r;
				}
			}
		}

		if (prequeuing_audio_) {
			DecrementPrequeuedAudio();
		}

		delete watcher;
	}
}

void ViewerWidget::ReceivedAudioBufferForScrubbing()
{
	RenderTicketWatcher *watcher = static_cast<RenderTicketWatcher *>(sender());

	while (!audio_scrub_watchers_.empty() &&
		   audio_scrub_watchers_.front() != watcher) {
		audio_scrub_watchers_.pop_front();
	}

	if (!audio_scrub_watchers_.empty()) {
		if (watcher->HasResult()) {
			SampleBuffer samples = watcher->Get().value<SampleBuffer>();
			if (samples.is_allocated()) {
				if (samples.audio_params().channel_count() > 0) {
					AudioProcessor::Buffer buf;
					int r =
						audio_processor_.Convert(samples.to_raw_ptrs().data(),
												 samples.sample_count(), &buf);

					if (r >= 0) {
						if (!buf.empty()) {
							QString error;
							const QByteArray &packed = buf.at(0);
							AudioManager::instance()->ClearBufferedOutput();
							if (!AudioManager::instance()->PushToOutput(
									audio_processor_.to(), packed, &error)) {
								Core::instance()->ShowStatusBarMessage(
									tr("Audio scrubbing failed: %1").arg(error));
							}
							AudioMonitor::PushSampleBufferOnAll(samples);
						}
					} else {
						qCritical()
							<< "Failed to process audio for scrubbing:" << r;
					}
				}
			}
		}
	}

	delete watcher;
}

void ViewerWidget::QueueStarved()
{
	static const int kMaximumWaitTimeMs = 250;
	static const rational kMaximumWaitTime(kMaximumWaitTimeMs, 1000);
	qint64 now = QDateTime::currentMSecsSinceEpoch();

	if (!queue_starved_start_) {
		queue_starved_start_ = now;
	} else if (now > queue_starved_start_ + kMaximumWaitTimeMs) {
		if (first_requeue_watcher_) {
			if (GetConnectedNode()->GetPlayhead() + kMaximumWaitTime <
				first_requeue_watcher_->property("time").value<rational>()) {
				// We still have time
				return;
			}
		}

		ForceRequeueFromCurrentTime();
		queue_starved_start_ = 0;
	}
}

void ViewerWidget::QueueNoLongerStarved()
{
	queue_starved_start_ = 0;
}

void ViewerWidget::ForceRequeueFromCurrentTime()
{
	// Allow half a second for requeue to complete
	static const rational kRequeueWaitTime(1);

	RenderManager::instance()->GetCacher()->ClearSingleFrameRenders();
	queue_watchers_.clear();
	int queue = DeterminePlaybackQueueSize();
	playback_queue_next_frame_ =
		GetTimestamp() +
		playback_speed_ * Timecode::time_to_timestamp(
							  kRequeueWaitTime, timebase(), Timecode::kFloor);
	;
	first_requeue_watcher_ = nullptr;
	for (int i = 0; i < queue; i++) {
		RenderTicketWatcher *watcher = RequestNextFrameForQueue();
		if (!first_requeue_watcher_) {
			first_requeue_watcher_ = watcher;
			connect(first_requeue_watcher_, &RenderTicketWatcher::destroyed,
					this, &ViewerWidget::HandleFirstRequeueDestroy);
		}
	}
}

void ViewerWidget::UpdateTextureFromNode()
{
	if (!GetConnectedNode()) {
		return;
	}

	if (IsPlaying()) {
		qWarning() << "UpdateTextureFromNode called while playing";
		return;
	}

	rational time = GetConnectedNode()->GetPlayhead();
	bool frame_exists_at_time = FrameExistsAtTime(time);
	bool frame_might_be_still = ViewerMightBeAStill();

	if (frame_exists_at_time || frame_might_be_still) {
		// Frame was not in queue, will require rendering or decoding from cache
		// Not playing, run a task to get the frame either from the cache or the renderer
		RenderTicketWatcher *watcher = new RenderTicketWatcher();
		watcher->setProperty("start", QDateTime::currentMSecsSinceEpoch());
		watcher->setProperty("time", QVariant::fromValue(time));
		connect(watcher, &RenderTicketWatcher::Finished, this,
				&ViewerWidget::RendererGeneratedFrame);
		nonqueue_watchers_.append(watcher);

		// Clear queue because we want this frame more than any others
		RenderManager::instance()
			->GetCacher()
			->ClearSingleFrameRendersThatArentRunning();

		DetectMulticamNode(time);

		watcher->SetTicket(GetFrame(time));
	} else {
		// There is definitely no frame here, we can immediately flip to showing nothing
		nonqueue_watchers_.clear();
		SetEmptyImage();
		return;
	}
}

void ViewerWidget::PlayInternal(int speed, bool in_to_out_only)
{
	Q_ASSERT(speed != 0);

	if (!GetConnectedNode()) {
		// Do nothing if no viewer node is attached
		return;
	}

	if (timebase().isNull()) {
		qCritical() << "ViewerWidget can't play with an invalid timebase";
		return;
	}

	// Kindly tell all viewers to stop playing and caching so all resources can be used for playback
	foreach (ViewerWidget *viewer, instances_) {
		if (viewer != this) {
			viewer->PauseInternal();
		}
	}
	RenderManager::instance()->GetCacher()->SetThumbnailsPaused(true);

	RenderManager::instance()->SetAggressiveGarbageCollection(true);

	// Disarm recording if armed
	if (record_armed_) {
		DisarmRecording();
	}

	// If the playhead is beyond the end, restart at 0
	if (!recording_) {
		rational last_frame = GetConnectedNode()->GetLength() - timebase();
		if (!in_to_out_only &&
			GetConnectedNode()->GetPlayhead() >= last_frame) {
			if (speed > 0) {
				GetConnectedNode()->SetPlayhead(0);
			} else {
				GetConnectedNode()->SetPlayhead(last_frame);
			}
		}
	}

	playback_speed_ = speed;
	play_in_to_out_only_ = in_to_out_only;

	playback_queue_next_frame_ = GetTimestamp() + playback_speed_;

	controls_->ShowPauseButton();

	queue_starved_start_ = 0;

	// Attempt to fill playback queue
	if (IsVideoVisible()) {
		prequeue_length_ = DeterminePlaybackQueueSize();

		if (prequeue_length_ > 0) {
			prequeuing_video_ = true;
			prequeue_count_ = 0;

			for (int i = 0; i < prequeue_length_; i++) {
				RequestNextFrameForQueue();
			}

			dry_run_next_frame_ = playback_queue_next_frame_;
			RequestNextDryRun();
		}
	}

	AudioParams ap = GetConnectedNode()->GetAudioParams();
	if (ap.is_valid() && ap.channel_count() != 0) {
		UpdateAudioProcessor();

		AudioManager::instance()->SetOutputNotifyInterval(
			audio_processor_.to().time_to_bytes(kAudioPlaybackInterval));
		connect(AudioManager::instance(), &AudioManager::OutputNotify, this,
				&ViewerWidget::QueueNextAudioBuffer);

		static const int prequeue_count = 2;
		prequeuing_audio_ = prequeue_count; // Queue two buffers ahead of time
		audio_playback_queue_time_ = GetConnectedNode()->GetPlayhead();
		for (int i = 0; i < prequeue_count; i++) {
			QueueNextAudioBuffer();
		}
	}

	// Force screen to stay awake
	PreventSleep(true);
}

void ViewerWidget::PauseInternal()
{
	if (recording_) {
		AudioManager::instance()->StopRecording();
		recording_ = false;
		controls_->SetPauseButtonRecordingState(false);

		recording_callback_->DisableRecordingOverlay();
		recording_callback_->RecordingCallback(
			recording_filename_, recording_range_, recording_track_);
	}

	if (IsPlaying()) {
		playback_speed_ = 0;
		controls_->ShowPlayButton();

		foreach (ViewerDisplayWidget *dw, playback_devices_) {
			dw->Pause();
		}

		qDeleteAll(queue_watchers_);
		queue_watchers_.clear();
		RenderManager::instance()->GetCacher()->ClearSingleFrameRenders();

		playback_backup_timer_.stop();

		// Handle audio
		AudioManager::instance()->StopOutput();
		AudioMonitor::StopOnAll();
		prequeued_audio_.clear();
		disconnect(AudioManager::instance(), &AudioManager::OutputNotify, this,
				   &ViewerWidget::QueueNextAudioBuffer);
		qDeleteAll(audio_playback_queue_);
		audio_playback_queue_.clear();
		UpdateAudioProcessor();

		RenderManager::instance()->GetCacher()->SetThumbnailsPaused(false);

		UpdateTextureFromNode();

		RenderManager::instance()->SetAggressiveGarbageCollection(false);
	}

	prequeuing_video_ = false;
	prequeuing_audio_ = 0;
	dry_run_watchers_.clear();

	// Reset screen timeout timer
	PreventSleep(false);
}

void ViewerWidget::PushScrubbedAudio()
{
	if (!IsPlaying() && GetConnectedNode() &&
		OLIVE_CONFIG("AudioScrubbing").toBool() && enable_audio_scrubbing_) {
		if (ignore_scrub_ > 0) {
			ignore_scrub_--;
		}

		if (ignore_scrub_ == 0) {
			// Get audio src device from renderer
			const AudioParams &params = GetConnectedNode()->GetAudioParams();

			if (params.is_valid()) {
				// NOTE: Hardcoded scrubbing interval (20ms)
				rational interval = rational(20, 1000);

				RenderTicketWatcher *watcher = new RenderTicketWatcher();
				connect(watcher, &RenderTicketWatcher::Finished, this,
						&ViewerWidget::ReceivedAudioBufferForScrubbing);
				audio_scrub_watchers_.push_back(watcher);
				watcher->SetTicket(
					RenderManager::instance()->GetCacher()->GetRangeOfAudio(
						GetConnectedNode(),
						TimeRange(GetConnectedNode()->GetPlayhead(),
								  GetConnectedNode()->GetPlayhead() +
									  interval)));
			}
		}
	}
}

void ViewerWidget::UpdateMinimumScale()
{
	if (!GetConnectedNode()) {
		return;
	}

	if (GetConnectedNode()->GetLength().isNull()) {
		// Avoids divide by zero
		SetMinimumScale(0);
	} else {
		SetMinimumScale(static_cast<double>(ruler()->width()) /
						GetConnectedNode()->GetLength().toDouble());
	}
}

void ViewerWidget::SetColorTransform(const ColorTransform &transform,
									 ViewerDisplayWidget *sender)
{
	sender->SetColorTransform(transform);
}

QString ViewerWidget::GetCachedFilenameFromTime(const rational &time)
{
	if (FrameExistsAtTime(time)) {
		return GetConnectedNode()->video_frame_cache()->GetValidCacheFilename(
			time);
	}

	return QString();
}

bool ViewerWidget::FrameExistsAtTime(const rational &time)
{
	return GetConnectedNode() && time >= 0 &&
		   time < GetConnectedNode()->GetVideoLength();
}

bool ViewerWidget::ViewerMightBeAStill()
{
	return GetConnectedNode() &&
		   GetConnectedNode()->GetConnectedTextureOutput() &&
		   GetConnectedNode()->GetVideoLength().isNull();
}

void ViewerWidget::SetDisplayImage(RenderTicketPtr ticket)
{
	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		QVariant push;
		if (ticket) {
			if (dynamic_cast<MulticamDisplay *>(dw)) {
				push = ticket->property("multicam_output");
			} else {
				push = ticket->Get();
			}
		}
		dw->SetImage(push);
	}
}

RenderTicketWatcher *ViewerWidget::RequestNextFrameForQueue(bool increment)
{
	RenderTicketWatcher *watcher = nullptr;

	rational next_time =
		Timecode::timestamp_to_time(playback_queue_next_frame_, timebase());

	if (FrameExistsAtTime(next_time) || ViewerMightBeAStill()) {
		if (increment) {
			playback_queue_next_frame_ += playback_speed_;
		}

		watcher = new RenderTicketWatcher();
		watcher->setProperty("time", QVariant::fromValue(next_time));
		DetectMulticamNode(next_time);
		connect(watcher, &RenderTicketWatcher::Finished, this,
				&ViewerWidget::RendererGeneratedFrameForQueue);
		queue_watchers_.append(watcher);
		watcher->SetTicket(GetFrame(next_time));
	}

	return watcher;
}

RenderTicketPtr ViewerWidget::GetFrame(const rational &t)
{
	QString cache_fn =
		GetConnectedNode()->video_frame_cache()->GetValidCacheFilename(t);

	if (!QFileInfo::exists(cache_fn)) {
		// Frame hasn't been cached, start render job
		return GetSingleFrame(t);
	} else {
		// Frame has been cached, grab the frame
		RenderTicketPtr ticket = std::make_shared<RenderTicket>();
		ticket->setProperty("time", QVariant::fromValue(t));
		QtConcurrent::run(
			static_cast<void (*)(RenderTicketPtr, const QString &,
								 const QUuid &, const int64_t &)>(
				ViewerWidget::DecodeCachedImage),
			ticket,
			GetConnectedNode()->video_frame_cache()->GetCacheDirectory(),
			GetConnectedNode()->video_frame_cache()->GetUuid(),
			Timecode::time_to_timestamp(t, timebase(), Timecode::kFloor));
		return ticket;
	}
}

void ViewerWidget::FinishPlayPreprocess()
{
	// Check if we're still waiting for video or audio respectively
	if (prequeuing_video_ || prequeuing_audio_) {
		return;
	}

	int64_t playback_start_time = GetTimestamp();

	// Start audio waveform playback
	if (!prequeued_audio_.isEmpty()) {
		QString error;
		if (!AudioManager::instance()->PushToOutput(audio_processor_.to(),
													prequeued_audio_, &error)) {
			QMessageBox::critical(
				this, tr("Audio Error"),
				tr("Failed to start audio: %1\n\n"
				   "Please check your audio preferences and try again.")
					.arg(error));
		}
		prequeued_audio_.clear();

		AudioMonitor::StartWaveformOnAll(
			GetConnectedNode()->GetConnectedWaveform(),
			GetConnectedNode()->GetPlayhead(), playback_speed_);
	}

	display_widget_->ResetFPSTimer();

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->Play(playback_start_time, playback_speed_, timebase(),
				 IsVideoVisible());
	}

	// This is our timer for loading the queue and setting the time
	playback_backup_timer_.setInterval(qFloor(timebase_dbl()));
	playback_backup_timer_.start();

	PlaybackTimerUpdate();
}

int ViewerWidget::DeterminePlaybackQueueSize()
{
	if (playback_speed_ == 0) {
		return 0;
	}

	int64_t end_ts;

	if (playback_speed_ > 0) {
		end_ts = Timecode::time_to_timestamp(
			GetConnectedNode()->GetVideoLength(), timebase());
	} else {
		end_ts = 0;
	}

	int remaining_frames = (end_ts - GetTimestamp() - 1) / playback_speed_;

	// Generate maximum queue
	int max_frames =
		qCeil(kVideoPlaybackInterval.toDouble() / timebase().toDouble());

	return qMin(max_frames, remaining_frames);
}

void ViewerWidget::ContextMenuSetFullScreen(QAction *action)
{
	SetFullScreen(QGuiApplication::screens().at(action->data().toInt()));
}

void ViewerWidget::ContextMenuSetPlaybackRes(QAction *action)
{
	int div = action->data().toInt();

	auto vp = GetConnectedNode()->GetVideoParams();
	vp.set_divider(div);

	auto c = new NodeParamSetStandardValueCommand(
		NodeKeyframeTrackReference(
			NodeInput(GetConnectedNode(), ViewerOutput::kVideoParamsInput, 0)),
		QVariant::fromValue(vp));
	Core::instance()->undo_stack()->push(c, tr("Changed Playback Resolution"));
}

void ViewerWidget::ContextMenuDisableSafeMargins()
{
	context_menu_widget_->SetSafeMargins(ViewerSafeMarginInfo(false));
}

void ViewerWidget::ContextMenuSetSafeMargins()
{
	context_menu_widget_->SetSafeMargins(ViewerSafeMarginInfo(true));
}

void ViewerWidget::ContextMenuSetCustomSafeMargins()
{
	bool ok;

	double new_ratio = GetFloatRatioFromUser(this, tr("Safe Margins"), &ok);

	if (ok) {
		context_menu_widget_->SetSafeMargins(
			ViewerSafeMarginInfo(true, new_ratio));
	}
}

void ViewerWidget::WindowAboutToClose()
{
	ViewerWindow *vw = static_cast<ViewerWindow *>(sender());
	windows_.remove(windows_.key(vw));
	playback_devices_.removeOne(vw->display_widget());
}

void ViewerWidget::RendererGeneratedFrame()
{
	RenderTicketWatcher *ticket = static_cast<RenderTicketWatcher *>(sender());

	if (ticket->HasResult()) {
		if (nonqueue_watchers_.contains(ticket)) {
			while (!nonqueue_watchers_.isEmpty()) {
				// Pop frames that are "old"
				if (nonqueue_watchers_.takeFirst() == ticket) {
					break;
				}
			}

			SetDisplayImage(ticket->GetTicket());
		}
	}

	delete ticket;
}

void ViewerWidget::RendererGeneratedFrameForQueue()
{
	RenderTicketWatcher *watcher = static_cast<RenderTicketWatcher *>(sender());

	if (queue_watchers_.contains(watcher)) {
		queue_watchers_.removeOne(watcher);

		if (watcher->HasResult()) {
			QVariant frame = watcher->Get();

			// Ignore this signal if we've paused now
			if (IsPlaying() || prequeuing_video_) {
				rational ts = watcher->property("time").value<rational>();

				foreach (ViewerDisplayWidget *dw, playback_devices_) {
					QVariant push;
					if (dynamic_cast<MulticamDisplay *>(dw)) {
						push =
							watcher->GetTicket()->property("multicam_output");
					} else {
						push = frame;
					}

					dw->queue()->AppendTimewise({ ts, push }, playback_speed_);
				}

				if (prequeuing_video_) {
					prequeue_count_++;

					if (prequeue_count_ == prequeue_length_) {
						prequeuing_video_ = false;
						FinishPlayPreprocess();
					} else {
						// This call was mostly necessary to keep the threads busy between prequeue and playback.
						// If we only have a single render thread, it's no longer necessary.
						//RequestNextFrameForQueue();
					}
				}
			}
		}
	}

	if (first_requeue_watcher_ == watcher) {
		first_requeue_watcher_ = nullptr;
	}

	delete watcher;
}

void ViewerWidget::ShowContextMenu(const QPoint &pos)
{
	if (!GetConnectedNode()) {
		return;
	}

	Menu menu(static_cast<QWidget *>(sender()));

	context_menu_widget_ = dynamic_cast<ViewerDisplayWidget *>(sender());

	// ViewerDisplayWidget options
	if (context_menu_widget_) {
		// Color options
		if (context_menu_widget_->color_manager() && color_menu_enabled_) {
			{
				Menu *ocio_colorspace_menu =
					context_menu_widget_->GetColorSpaceMenu(&menu);
				menu.addMenu(ocio_colorspace_menu);
			}

			{
				Menu *ocio_display_menu =
					context_menu_widget_->GetDisplayMenu(&menu);
				menu.addMenu(ocio_display_menu);
			}

			{
				Menu *ocio_view_menu = context_menu_widget_->GetViewMenu(&menu);
				menu.addMenu(ocio_view_menu);
			}

			{
				Menu *ocio_look_menu = context_menu_widget_->GetLookMenu(&menu);
				menu.addMenu(ocio_look_menu);
			}

			menu.addSeparator();
		}

		{
			// Viewer Zoom Level
			Menu *zoom_menu = new Menu(tr("Zoom"), &menu);
			menu.addMenu(zoom_menu);

			zoom_menu->addAction(tr("Fit"))->setData(-1);
			for (int i = 0; i < ViewerSizer::kZoomLevelCount; i++) {
				double z = ViewerSizer::kZoomLevels[i];
				zoom_menu->addAction(tr("%1%").arg(z * 100.0))->setData(z);
			}

			connect(zoom_menu, &QMenu::triggered, this,
					&ViewerWidget::SetZoomFromMenu);
		}

		{
			// Full Screen Menu
			Menu *full_screen_menu = new Menu(tr("Full Screen"), &menu);
			menu.addMenu(full_screen_menu);

			for (int i = 0; i < QGuiApplication::screens().size(); i++) {
				QScreen *s = QGuiApplication::screens().at(i);

				QAction *a = full_screen_menu->addAction(
					tr("Screen %1: %2x%3")
						.arg(QString::number(i),
							 QString::number(s->size().width()),
							 QString::number(s->size().height())));

				a->setData(i);
				a->setCheckable(true);
				a->setChecked(
					windows_.contains(QGuiApplication::screens().at(i)));
			}

			connect(full_screen_menu, &QMenu::triggered, this,
					&ViewerWidget::ContextMenuSetFullScreen);
		}

		{
			// Playback Resolution Menu
			Menu *playback_res_menu =
				new Menu(tr("Playback Resolution"), &menu);
			menu.addMenu(playback_res_menu);

			for (int d : VideoParams::kSupportedDividers) {
				playback_res_menu->AddActionWithData(
					VideoParams::GetNameForDivider(d), d,
					GetConnectedNode()->GetVideoParams().divider());
			}

			connect(playback_res_menu, &QMenu::triggered, this,
					&ViewerWidget::ContextMenuSetPlaybackRes);
		}

		{
			// Deinterlace Option
			if (GetConnectedNode()->GetVideoParams().interlacing() !=
				VideoParams::kInterlaceNone) {
				QAction *deinterlace_action = menu.addAction(tr("Deinterlace"));
				deinterlace_action->setCheckable(true);
				deinterlace_action->setChecked(
					display_widget_->IsDeinterlacing());
				connect(deinterlace_action, &QAction::triggered,
						display_widget_,
						&ViewerDisplayWidget::SetDeinterlacing);
			}
		}

		menu.addSeparator();

		/* TEMP: Hide sequence cache options. Want to see if clip caching supersedes it.
    {
      Menu* cache_menu = new Menu(tr("Cache"), &menu);
      menu.addMenu(cache_menu);

      // Cache Entire Sequence
      QAction* cache_entire_sequence = cache_menu->addAction(tr("Cache Entire Sequence"));
      connect(cache_entire_sequence, &QAction::triggered, this, &ViewerWidget::CacheEntireSequence);

      // Cache In/Out Sequence
      QAction* cache_inout_sequence = cache_menu->addAction(tr("Cache Sequence In/Out"));
      connect(cache_inout_sequence, &QAction::triggered, this, &ViewerWidget::CacheSequenceInOut);
    }*/

		menu.addSeparator();

		{
			// Safe Margins
			Menu *safe_margin_menu = new Menu(tr("Safe Margins"), &menu);
			menu.addMenu(safe_margin_menu);

			QAction *safe_margin_off = safe_margin_menu->addAction(tr("Off"));
			safe_margin_off->setCheckable(true);
			safe_margin_off->setChecked(
				!context_menu_widget_->GetSafeMargin().is_enabled());
			connect(safe_margin_off, &QAction::triggered, this,
					&ViewerWidget::ContextMenuDisableSafeMargins);

			QAction *safe_margin_on = safe_margin_menu->addAction(tr("On"));
			safe_margin_on->setCheckable(true);
			safe_margin_on->setChecked(
				context_menu_widget_->GetSafeMargin().is_enabled() &&
				!context_menu_widget_->GetSafeMargin().custom_ratio());
			connect(safe_margin_on, &QAction::triggered, this,
					&ViewerWidget::ContextMenuSetSafeMargins);

			QAction *safe_margin_custom =
				safe_margin_menu->addAction(tr("Custom Aspect"));
			safe_margin_custom->setCheckable(true);
			safe_margin_custom->setChecked(
				context_menu_widget_->GetSafeMargin().is_enabled() &&
				context_menu_widget_->GetSafeMargin().custom_ratio());
			connect(safe_margin_custom, &QAction::triggered, this,
					&ViewerWidget::ContextMenuSetCustomSafeMargins);
		}

		menu.addSeparator();
	}

	{
		QAction *stop_playback_on_last_frame =
			menu.addAction(tr("Stop Playback On Last Frame"));
		stop_playback_on_last_frame->setCheckable(true);
		stop_playback_on_last_frame->setChecked(
			OLIVE_CONFIG("StopPlaybackOnLastFrame").toBool());
		connect(stop_playback_on_last_frame, &QAction::triggered, this,
				[](bool e) { OLIVE_CONFIG("StopPlaybackOnLastFrame") = e; });

		menu.addSeparator();
	}

	{
		auto waveform_menu = new Menu(tr("Audio Waveform"), &menu);
		menu.addMenu(waveform_menu);

		waveform_menu->AddActionWithData(tr("Automatically Show/Hide"),
										 kWFAutomatic, waveform_mode_);
		waveform_menu->AddActionWithData(tr("Show Waveform Only"),
										 kWFWaveformOnly, waveform_mode_);
		waveform_menu->AddActionWithData(tr("Show Both Viewer And Waveform"),
										 kWFViewerAndWaveform, waveform_mode_);

		connect(waveform_menu, &Menu::triggered, this,
				&ViewerWidget::UpdateWaveformModeFromMenu);
	}

	{
		QAction *show_fps_action = menu.addAction(tr("Show FPS"));
		show_fps_action->setCheckable(true);
		show_fps_action->setChecked(display_widget_->GetShowFPS());
		connect(show_fps_action, &QAction::triggered, display_widget_,
				&ViewerDisplayWidget::SetShowFPS);
	}

	if (context_menu_widget_ == display_widget_) {
		auto subtitle_menu = new Menu(tr("Subtitles"), &menu);
		menu.addMenu(subtitle_menu);

		QAction *show_subtitles_action =
			subtitle_menu->addAction(tr("Show Subtitles"));
		show_subtitles_action->setCheckable(true);
		show_subtitles_action->setChecked(display_widget_->GetShowSubtitles());
		connect(show_subtitles_action, &QAction::triggered, display_widget_,
				&ViewerDisplayWidget::SetShowSubtitles);

		subtitle_menu->addSeparator();

		auto subtitle_font_properties =
			subtitle_menu->addAction(tr("Subtitle Properties"));
		connect(subtitle_font_properties, &QAction::triggered, this,
				&ViewerWidget::ShowSubtitleProperties);

		auto subtitle_antialias =
			subtitle_menu->addAction(tr("Use Anti-aliasing"));
		subtitle_antialias->setCheckable(true);
		subtitle_antialias->setChecked(
			OLIVE_CONFIG("AntialiasSubtitles").toBool());
		connect(subtitle_antialias, &QAction::triggered, this, [this](bool e) {
			OLIVE_CONFIG("AntialiasSubtitles") = e;
			display_widget_->update();
		});
	}

	menu.addSeparator();

	auto save_frame_as_image = menu.addAction(tr("Save Frame As Image"));
	connect(save_frame_as_image, &QAction::triggered, this,
			&ViewerWidget::SaveFrameAsImage);

	menu.exec(static_cast<QWidget *>(sender())->mapToGlobal(pos));
}

void ViewerWidget::Play(bool in_to_out_only)
{
	if (in_to_out_only) {
		if (GetConnectedNode() &&
			GetConnectedNode()->GetWorkArea()->enabled()) {
			// Jump to in point
			GetConnectedNode()->SetPlayhead(
				GetConnectedNode()->GetWorkArea()->in());
		} else {
			in_to_out_only = false;
		}
	} else if (record_armed_) {
		DisarmRecording();

		if (GetConnectedNode()->project()->filename().isEmpty()) {
			QMessageBox::critical(
				this, tr("Audio Recording"),
				tr("Project must be saved before you can record audio."));
			return;
		}

		QDir audio_path(QFileInfo(GetConnectedNode()->project()->filename())
							.dir()
							.filePath(tr("audio")));
		if (!audio_path.exists()) {
			audio_path.mkpath(QStringLiteral("."));
		}

		recording_filename_ = audio_path.filePath(QStringLiteral("%1.%2").arg(
			QDateTime::currentDateTime().toString("yyyy-MM-dd hh-mm-ss"),
			ExportFormat::GetExtension(static_cast<ExportFormat::Format>(
				OLIVE_CONFIG("AudioRecordingFormat").toInt()))));

		AudioParams ap(
			OLIVE_CONFIG("AudioRecordingSampleRate").toInt(),
			OLIVE_CONFIG("AudioRecordingChannelLayout").toULongLong(),
			SampleFormat::from_string(OLIVE_CONFIG("AudioRecordingSampleFormat")
										  .toString()
										  .toStdString()));

		EncodingParams encode_param;
		encode_param.EnableAudio(
			ap, static_cast<ExportCodec::Codec>(
					OLIVE_CONFIG("AudioRecordingCodec").toInt()));
		encode_param.SetFilename(recording_filename_);
		encode_param.set_audio_bit_rate(
			OLIVE_CONFIG("AudioRecordingBitRate").toInt() * 1000);

		QString error;
		if (AudioManager::instance()->StartRecording(encode_param, &error)) {
			recording_ = true;
			controls_->SetPauseButtonRecordingState(true);
			recording_callback_->EnableRecordingOverlay(
				TimelineCoordinate(recording_range_.in(), recording_track_));
		} else {
			QMessageBox::critical(
				this, tr("Audio Recording"),
				tr("Failed to start audio recording: %1").arg(error));
			return;
		}
	}

	PlayInternal(1, in_to_out_only);
}

void ViewerWidget::Play()
{
	Play(false);
}

void ViewerWidget::Pause()
{
	PauseInternal();
}

void ViewerWidget::ShuttleLeft()
{
	int current_speed = playback_speed_;

	if (current_speed != 0) {
		PauseInternal();
	}

	current_speed--;

	if (current_speed == 0) {
		current_speed--;
	}

	PlayInternal(current_speed, false);
}

void ViewerWidget::ShuttleStop()
{
	Pause();
}

void ViewerWidget::ShuttleRight()
{
	int current_speed = playback_speed_;

	if (current_speed != 0) {
		PauseInternal();
	}

	current_speed++;

	if (current_speed == 0) {
		current_speed++;
	}

	PlayInternal(current_speed, false);
}

void ViewerWidget::SetColorTransform(const ColorTransform &transform)
{
	SetColorTransform(transform, display_widget_);
}

void ViewerWidget::SetSignalCursorColorEnabled(bool e)
{
	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetSignalCursorColorEnabled(e);
	}
}

void ViewerWidget::TimebaseChangedEvent(const rational &timebase)
{
	super::TimebaseChangedEvent(timebase);

	controls_->SetTimebase(timebase);

	controls_->SetTime(GetConnectedNode() ? GetConnectedNode()->GetPlayhead() :
											0);
	LengthChangedSlot(GetConnectedNode() ? GetConnectedNode()->GetLength() : 0);
}

void ViewerWidget::PlaybackTimerUpdate()
{
	Q_ASSERT(playback_speed_ != 0);

	rational current_time = Timecode::timestamp_to_time(
		display_widget_->timer()->GetTimestampNow(), timebase());

	rational min_time, max_time;

	if (recording_ && recording_range_.out() != recording_range_.in()) {
		// Limit recording range if applicable
		min_time = recording_range_.in();
		max_time = recording_range_.out();

	} else if (play_in_to_out_only_ &&
			   GetConnectedNode()->GetWorkArea()->enabled()) {
		// If "play in to out" is enabled or we're looping AND we have a workarea, only play the workarea
		min_time = GetConnectedNode()->GetWorkArea()->in();
		max_time = GetConnectedNode()->GetWorkArea()->out();

	} else {
		// Otherwise set the bounds to the range of the sequence
		min_time = 0;
		max_time = GetConnectedNode()->GetLength();
	}

	// If we're stopping playback on the last frame rather than after it, subtract our max time
	// by one timebase unit
	if (OLIVE_CONFIG("StopPlaybackOnLastFrame").toBool()) {
		max_time = qMax(min_time, max_time - timebase());
	}

	rational time_to_set;
	bool end_of_line = false;
	bool play_after_pause = false;

	if ((!recording_ || recording_range_.out() != recording_range_.in()) &&
		((playback_speed_ < 0 && current_time <= min_time) ||
		 (playback_speed_ > 0 && current_time >= max_time))) {
		// Determine which timestamp we tripped
		rational tripped_time;

		if (current_time <= min_time) {
			tripped_time = min_time;
		} else {
			tripped_time = max_time;
		}

		// Signal that we've reached the end of whatever range we're playing and should either pause
		// or restart playback
		end_of_line = true;

		if (OLIVE_CONFIG("Loop").toBool() && !recording_) {
			// If we're looping, jump to the other side of the workarea and continue
			time_to_set = (tripped_time == min_time) ? max_time : min_time;

			// Signal to restart playback after the pause signalled by `end_of_line`
			play_after_pause = true;

		} else {
			// Pause at the boundary we tripped
			time_to_set = tripped_time;
		}

	} else {
		// Sets time normally to whatever we calculated as the "current time"
		time_to_set = current_time;
	}

	// Set the time. By wrapping in this bool, we prevent TimeChangedEvent's default behavior of
	// pausing. Even if we pause it later with `end_of_line`, we prefer pausing after setting the time
	// so that an audio scrub event, etc. isn't sent.
	time_changed_from_timer_ = true;
	GetConnectedNode()->SetPlayhead(time_to_set);
	time_changed_from_timer_ = false;
	if (end_of_line) {
		// Cache the current speed
		int current_speed = playback_speed_;

		PauseInternal();
		if (play_after_pause) {
			PlayInternal(current_speed, play_in_to_out_only_);
		}
	}

	if (IsPlaying() && IsVideoVisible()) {
		while ((int(display_widget_->queue()->size()) +
				queue_watchers_.size()) < DeterminePlaybackQueueSize()) {
			if (!RequestNextFrameForQueue()) {
				// Prevent infinite loop
				break;
			}
		}
	}

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->queue()->PurgeBefore(current_time, playback_speed_);
	}
}

void ViewerWidget::SetViewerResolution(int width, int height)
{
	sizer_->SetChildSize(width, height);

	foreach (ViewerWindow *vw, windows_) {
		vw->SetResolution(width, height);
	}
}

void ViewerWidget::SetViewerPixelAspect(const rational &ratio)
{
	sizer_->SetPixelAspectRatio(ratio);

	foreach (ViewerWindow *vw, windows_) {
		vw->SetPixelAspectRatio(ratio);
	}
}

void ViewerWidget::LengthChangedSlot(const rational &length)
{
	if (last_length_ != length) {
		controls_->SetEndTime(length);
		UpdateMinimumScale();

		if (GetConnectedNode() && length < last_length_ &&
			GetConnectedNode()->GetPlayhead() >= length) {
			UpdateTextureFromNode();
		}

		last_length_ = length;
	}
}

void ViewerWidget::InterlacingChangedSlot(VideoParams::Interlacing interlacing)
{
	// Automatically set a "sane" deinterlacing option
	bool deint = interlacing != VideoParams::kInterlaceNone;

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetDeinterlacing(deint);
	}
}

void ViewerWidget::UpdateRendererVideoParameters()
{
	VideoParams vp = GetConnectedNode()->GetVideoParams();

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetVideoParams(vp);
	}
}

void ViewerWidget::UpdateRendererAudioParameters()
{
	AudioParams ap = GetConnectedNode()->GetAudioParams();

	UpdateAudioProcessor();

	foreach (ViewerDisplayWidget *dw, playback_devices_) {
		dw->SetAudioParams(ap);
	}
}

void ViewerWidget::SetZoomFromMenu(QAction *action)
{
	auto s = sizer_->GetContainerSize();
	sizer_->SetZoomAnchored(action->data().toDouble(), s.width() / 2,
							s.height() / 2);
}

void ViewerWidget::ViewerInvalidatedVideoRange(const TimeRange &range)
{
	// If our current frame is within this range, we need to update
	if (!IsPlaying() && GetConnectedNode()->GetPlayhead() >= range.in() &&
		(GetConnectedNode()->GetPlayhead() < range.out() ||
		 range.in() == range.out())) {
		QMetaObject::invokeMethod(this, &ViewerWidget::UpdateTextureFromNode,
								  Qt::QueuedConnection);
	}
}

void ViewerWidget::UpdateWaveformModeFromMenu(QAction *a)
{
	SetWaveformMode(static_cast<WaveformMode>(a->data().toInt()));
}

void ViewerWidget::DragEntered(QDragEnterEvent *event)
{
	if (event->mimeData()->formats().contains(Project::kItemMimeType)) {
		event->accept();
	}
}

void ViewerWidget::Dropped(QDropEvent *event)
{
	QByteArray mimedata = event->mimeData()->data(Project::kItemMimeType);
	QDataStream stream(&mimedata, QIODevice::ReadOnly);

	// Variables to deserialize into
	quintptr item_ptr = 0;
	QVector<Track::Reference> enabled_streams;

	while (!stream.atEnd()) {
		stream >> enabled_streams >> item_ptr;

		// We only need the one item
		break;
	}

	if (item_ptr) {
		Node *item = reinterpret_cast<Node *>(item_ptr);
		ViewerOutput *viewer = dynamic_cast<ViewerOutput *>(item);

		if (viewer) {
			ConnectViewerNode(viewer);
		}
	}
}

}