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diff --git a/cinelerra-5.1/cinelerra/vwindow.C b/cinelerra-5.1/cinelerra/vwindow.C
new file mode 100644
index 00000000..d65fd597
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/vwindow.C
@@ -0,0 +1,488 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 1997-2012 Adam Williams <broadcast at earthling dot net>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "asset.h"
+#include "assets.h"
+#include "bcsignals.h"
+#include "clip.h"
+#include "clipedit.h"
+#include "bchash.h"
+#include "edl.h"
+#include "edlsession.h"
+#include "filesystem.h"
+#include "filexml.h"
+#include "indexable.h"
+#include "language.h"
+#include "localsession.h"
+#include "mainclock.h"
+#include "mainmenu.h"
+#include "mainsession.h"
+#include "mwindow.h"
+#include "mwindowgui.h"
+#include "playbackengine.h"
+#include "tracks.h"
+#include "transportque.h"
+#include "vplayback.h"
+#include "vtimebar.h"
+#include "vtracking.h"
+#include "vwindow.h"
+#include "vwindowgui.h"
+
+
+VWindow::VWindow(MWindow *mwindow)
+ : BC_DialogThread()
+{
+	this->mwindow = mwindow;
+	gui = 0;
+	playback_engine = 0;
+	playback_cursor = 0;
+	clip_edit = 0;
+	indexable = 0;
+	edl = 0;
+}
+
+
+VWindow::~VWindow()
+{
+	close_window();
+//printf("VWindow::~VWindow 1\n");
+	delete playback_engine;
+//printf("VWindow::~VWindow 1\n");
+	delete playback_cursor;
+	delete_source(1, 0);
+	delete clip_edit;
+//printf("VWindow::~VWindow 2\n");
+}
+
+void VWindow::delete_source(int do_main_edl, int update_gui)
+{
+//printf("VWindow::delete_source %d %d %p %p\n", __LINE__, gui->get_window_lock(), edl, indexable);
+	if(do_main_edl) mwindow->edl->remove_vwindow_edl(get_edl());
+
+	if(edl)
+	{
+		edl->Garbage::remove_user();
+//printf("VWindow::delete_source %d\n", __LINE__);
+		edl = 0;
+	}
+
+// 	if(mwindow->edl->vwindow_edl && !mwindow->edl->vwindow_edl_shared)
+// 	{
+// 		mwindow->edl->vwindow_edl->Garbage::remove_user();
+// 		mwindow->edl->vwindow_edl = 0;
+//		mwindow->edl->vwindow_edl_shared = 0;
+// 	}
+
+//printf("VWindow::delete_source %d\n", __LINE__);
+	if(indexable) indexable->Garbage::remove_user();
+	indexable = 0;
+
+	if(update_gui) gui->change_source(0, _("Viewer"));
+//printf("VWindow::delete_source %d\n", __LINE__);
+}
+
+
+void VWindow::load_defaults()
+{
+}
+
+void VWindow::create_objects()
+{
+}
+
+
+void VWindow::handle_done_event(int result)
+{
+	playback_engine->interrupt_playback(1);
+	delete_source(1, 0);
+	if( mwindow->in_destructor ) return;
+
+	int total = 0;
+	for(int i = 0; i < mwindow->vwindows.size(); i++)
+	{
+
+//printf("VWindow::handle_done_event %d %d\n", __LINE__, mwindow->vwindows.get(i)->is_running());
+		if(mwindow->vwindows.get(i)->is_running()) total++;
+	}
+// subtract ourselves
+	total--;
+
+// Update the menu if no viewers visible
+	if(!total)
+	{
+ 		mwindow->gui->lock_window("VWindowGUI::close_event");
+ 		mwindow->gui->mainmenu->show_vwindow->set_checked(0);
+ 		mwindow->gui->unlock_window();
+
+		mwindow->session->show_vwindow = 0;
+ 		mwindow->save_defaults();
+	}
+}
+
+
+
+BC_Window* VWindow::new_gui()
+{
+//printf("VWindow::create_objects 1\n");
+	gui = new VWindowGUI(mwindow, this);
+//printf("VWindow::create_objects 1\n");
+	gui->create_objects();
+//printf("VWindow::create_objects 1\n");
+
+	playback_engine = new VPlayback(mwindow, this, gui->canvas);
+//printf("VWindow::create_objects 1\n");
+
+// Start command loop
+	playback_engine->create_objects();
+//printf("VWindow::create_objects 1\n");
+	gui->transport->set_engine(playback_engine);
+//printf("VWindow::create_objects 1\n");
+	playback_cursor = new VTracking(mwindow, this);
+//printf("VWindow::create_objects 1\n");
+	playback_cursor->create_objects();
+//printf("VWindow::create_objects 2\n");
+
+	clip_edit = new ClipEdit(mwindow, 0, this);
+	return gui;
+}
+
+
+EDL* VWindow::get_edl()
+{
+//	return mwindow->edl->vwindow_edl;
+	return edl;
+}
+
+Indexable* VWindow::get_source()
+{
+	return this->indexable;
+}
+
+void VWindow::change_source(int edl_number)
+{
+	if(!is_running()) return;
+
+//printf("VWindow::change_source %d %p\n", __LINE__, mwindow->edl->get_vwindow_edl(edl_number));
+	if( edl_number >= 0 && edl_number < mwindow->edl->total_vwindow_edls() &&
+		 mwindow->edl->get_vwindow_edl(edl_number) )
+	{
+		this->edl = mwindow->edl->get_vwindow_edl(edl_number);
+		this->edl->Garbage::add_user();
+		gui->change_source(get_edl(), get_edl()->local_session->clip_title);
+		update_position(CHANGE_ALL, 1, 1, 1);
+	}
+	else
+	{
+		delete_source(1, 1);
+//		if(indexable) indexable->Garbage::remove_user();
+//		indexable = 0;
+//		mwindow->edl->vwindow_edl_shared = 0;
+	}
+}
+
+void VWindow::change_source(Indexable *indexable)
+{
+	if(!running()) return;
+// 	if(asset && this->asset &&
+// 		asset->id == this->asset->id &&
+// 		asset == this->asset) return;
+
+//printf("VWindow::change_source %d\n", __LINE__);
+
+	char title[BCTEXTLEN];
+	FileSystem fs;
+	fs.extract_name(title, indexable->path);
+//printf("VWindow::change_source 1\n");
+
+	delete_source(1, 0);
+//printf("VWindow::change_source 1\n");
+
+// Generate EDL off of main EDL for cutting
+	Asset *asset = 0;
+	EDL *nested_edl = 0;
+	if(indexable->is_asset)
+	{
+		this->indexable = asset = new Asset;
+		asset->copy_from((Asset*)indexable, 0);
+	}
+	else
+	{
+		this->indexable = nested_edl = new EDL;
+		nested_edl->create_objects();
+		nested_edl->copy_all((EDL*)indexable);
+	}
+
+// Create EDL
+	this->edl = new EDL(mwindow->edl);
+	this->edl->create_objects();
+	mwindow->edl->append_vwindow_edl(this->edl, 1);
+
+//	mwindow->edl->vwindow_edl = new EDL(mwindow->edl);
+//	mwindow->edl->vwindow_edl_shared = 0;
+//	mwindow->edl->vwindow_edl->create_objects();
+
+//printf("VWindow::change_source 1 %d %p %p\n", __LINE__, asset, nested_edl);
+	if(asset)
+		mwindow->asset_to_edl(this->edl, asset);
+	else
+		mwindow->edl_to_nested(this->edl, nested_edl);
+
+// Update GUI
+	gui->change_source(this->edl, title);
+	update_position(CHANGE_ALL, 1, 1, 1);
+
+
+
+//printf("VWindow::change_source 2\n");
+}
+
+void VWindow::change_source(EDL *edl)
+{
+	if(!running()) return;
+//printf("VWindow::change_source %d %p\n", __LINE__, edl);
+// EDLs are identical
+//	if(edl && mwindow->edl->vwindow_edl &&
+//		edl->id == mwindow->edl->vwindow_edl->id) return;
+	if(edl && get_edl() && edl->id == get_edl()->id) return;
+
+	delete_source(1, 0);
+
+	if(edl)
+	{
+		mwindow->edl->append_vwindow_edl(edl, 1);
+		this->edl = edl;
+		this->edl->Garbage::add_user();
+
+//		mwindow->edl->vwindow_edl = edl;
+// in order not to later delete edl if it is shared
+//		edl->Garbage::add_user();
+//		mwindow->edl->vwindow_edl_shared = 1;
+
+// Update GUI
+		gui->change_source(edl, edl->local_session->clip_title);
+		update_position(CHANGE_ALL, 1, 1, 1);
+	}
+	else
+		gui->change_source(edl, _("Viewer"));
+}
+
+void VWindow::change_source(char *folder, int item)
+{
+//printf("VWindow::change_source %d\n", __LINE__);
+	int result = 0;
+	if(!running()) return;
+// Search EDLs
+	if(!strcasecmp(folder, CLIP_FOLDER))
+	{
+		if(item < mwindow->edl->clips.total)
+		{
+			change_source(mwindow->edl->clips.values[item]);
+			result = 1;
+		}
+	}
+	else
+// Search media
+	if(!strcasecmp(folder, MEDIA_FOLDER))
+	{
+		if(item < mwindow->edl->assets->total())
+		{
+			change_source(mwindow->edl->assets->get_item_number(item));
+			result = 1;
+		}
+	}
+	else
+// Search extra clip folders
+	{
+	}
+
+	if(!result)
+	{
+		delete_source(1, 1);
+	}
+}
+
+
+
+
+void VWindow::goto_start()
+{
+	if(get_edl())
+	{
+		get_edl()->local_session->set_selectionstart(0);
+		get_edl()->local_session->set_selectionend(0);
+		update_position(CHANGE_NONE,
+			0,
+			1,
+			0);
+	}
+}
+
+void VWindow::goto_end()
+{
+	if(get_edl())
+	{
+		double position = get_edl()->tracks->total_length();
+		get_edl()->local_session->set_selectionstart(position);
+		get_edl()->local_session->set_selectionend(position);
+		update_position(CHANGE_NONE,
+			0,
+			1,
+			0);
+	}
+}
+
+void VWindow::update(int do_timebar)
+{
+	if(do_timebar)
+		gui->timebar->update(1);
+}
+
+void VWindow::update_position(int change_type,
+	int use_slider,
+	int update_slider,
+	int lock_window)
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+//printf("VWindow::update_position %d\n", __LINE__);
+//edl->dump();
+		playback_engine->que->send_command(CURRENT_FRAME,
+			change_type,
+			edl,
+			1);
+
+		double position = edl->local_session->get_selectionstart(1);
+		Asset *asset = edl->assets->first;
+		if( asset && asset->tcstart ) {
+			double rate = asset->video_data ? asset->frame_rate :
+				asset->audio_data ? asset->sample_rate : 0;
+			if( rate > 0 )
+				position += asset->tcstart / rate;
+		}
+
+		if(lock_window) gui->lock_window("VWindow::update_position");
+		gui->clock->update(position);
+		if(lock_window) gui->unlock_window();
+	}
+}
+
+
+
+
+
+int VWindow::update_position(double position)
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		gui->unlock_window();
+
+		playback_engine->interrupt_playback(1);
+
+		position = mwindow->edl->align_to_frame(position, 0);
+		position = MAX(0, position);
+
+		edl->local_session->set_selectionstart(position);
+		edl->local_session->set_selectionend(position);
+
+		gui->lock_window("VWindow::update_position 1");
+		update_position(CHANGE_NONE, 0, 1, 0);
+	}
+
+	return 1;
+}
+
+void VWindow::set_inpoint()
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		edl->set_inpoint(edl->local_session->get_selectionstart(1));
+		gui->timebar->update(1);
+	}
+}
+
+void VWindow::set_outpoint()
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		edl->set_outpoint(edl->local_session->get_selectionstart(1));
+		gui->timebar->update(1);
+	}
+}
+
+void VWindow::clear_inpoint()
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		edl->local_session->unset_inpoint();
+		gui->timebar->update(1);
+	}
+}
+
+void VWindow::clear_outpoint()
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		edl->local_session->unset_outpoint();
+		gui->timebar->update(1);
+	}
+}
+
+void VWindow::copy()
+{
+	EDL *edl = get_edl();
+	if(edl)
+	{
+		double start = edl->local_session->get_selectionstart();
+		double end = edl->local_session->get_selectionend();
+		FileXML file;
+		edl->copy(start,
+			end,
+			0,
+			0,
+			0,
+			&file,
+			"",
+			1);
+		const char *file_string = file.string();
+		long file_length = strlen(file_string);
+		mwindow->gui->lock_window();
+		mwindow->gui->get_clipboard()->to_clipboard(file_string, file_length,
+			SECONDARY_SELECTION);
+		mwindow->gui->get_clipboard()->to_clipboard(file_string, file_length,
+			BC_PRIMARY_SELECTION);
+		mwindow->gui->unlock_window();
+	}
+}
+
+void VWindow::splice_selection()
+{
+}
+
+void VWindow::overwrite_selection()
+{
+}
+