blender-archive/source/blender/editors/space_sequencer/sequencer_edit.c

/*
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup spseq
 */


#include <stdlib.h>
#include <math.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_ghash.h"
#include "BLI_math.h"
#include "BLI_timecode.h"
#include "BLI_utildefines.h"

#include "BLT_translation.h"

#include "DNA_scene_types.h"
#include "DNA_sound_types.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_main.h"
#include "BKE_report.h"
#include "BKE_sequencer.h"
#include "BKE_sound.h"
#include "BKE_library.h"

#include "WM_api.h"
#include "WM_types.h"

#include "RNA_define.h"
#include "RNA_enum_types.h"

/* for menu/popup icons etc etc*/

#include "ED_anim_api.h"
#include "ED_numinput.h"
#include "ED_screen.h"
#include "ED_transform.h"
#include "ED_sequencer.h"
#include "ED_space_api.h"

#include "UI_view2d.h"
#include "UI_interface.h"

/* own include */
#include "sequencer_intern.h"

/* XXX */
/* RNA Enums, used in multiple files */
EnumPropertyItem sequencer_prop_effect_types[] = {
	{SEQ_TYPE_CROSS, "CROSS", 0, "Crossfade", "Crossfade effect strip type"},
	{SEQ_TYPE_ADD, "ADD", 0, "Add", "Add effect strip type"},
	{SEQ_TYPE_SUB, "SUBTRACT", 0, "Subtract", "Subtract effect strip type"},
	{SEQ_TYPE_ALPHAOVER, "ALPHA_OVER", 0, "Alpha Over", "Alpha Over effect strip type"},
	{SEQ_TYPE_ALPHAUNDER, "ALPHA_UNDER", 0, "Alpha Under", "Alpha Under effect strip type"},
	{SEQ_TYPE_GAMCROSS, "GAMMA_CROSS", 0, "Gamma Cross", "Gamma Cross effect strip type"},
	{SEQ_TYPE_MUL, "MULTIPLY", 0, "Multiply", "Multiply effect strip type"},
	{SEQ_TYPE_OVERDROP, "OVER_DROP", 0, "Alpha Over Drop", "Alpha Over Drop effect strip type"},
	{SEQ_TYPE_WIPE, "WIPE", 0, "Wipe", "Wipe effect strip type"},
	{SEQ_TYPE_GLOW, "GLOW", 0, "Glow", "Glow effect strip type"},
	{SEQ_TYPE_TRANSFORM, "TRANSFORM", 0, "Transform", "Transform effect strip type"},
	{SEQ_TYPE_COLOR, "COLOR", 0, "Color", "Color effect strip type"},
	{SEQ_TYPE_SPEED, "SPEED", 0, "Speed", "Color effect strip type"},
	{SEQ_TYPE_MULTICAM, "MULTICAM", 0, "Multicam Selector", ""},
	{SEQ_TYPE_ADJUSTMENT, "ADJUSTMENT", 0, "Adjustment Layer", ""},
	{SEQ_TYPE_GAUSSIAN_BLUR, "GAUSSIAN_BLUR", 0, "Gaussian Blur", ""},
	{SEQ_TYPE_TEXT, "TEXT", 0, "Text", ""},
	{SEQ_TYPE_COLORMIX, "COLORMIX", 0, "Color Mix", ""},
	{0, NULL, 0, NULL, NULL},
};

/* mute operator */

#define SEQ_SIDE_MOUSE -1

EnumPropertyItem prop_side_types[] = {
	{SEQ_SIDE_MOUSE, "MOUSE", 0, "Mouse position", "" },
	{SEQ_SIDE_LEFT, "LEFT", 0, "Left", "" },
	{SEQ_SIDE_RIGHT, "RIGHT", 0, "Right", ""},
	{SEQ_SIDE_BOTH, "BOTH", 0, "Both", ""},
	{0, NULL, 0, NULL, NULL},
};

static const EnumPropertyItem prop_side_lr_types[] = {
	{SEQ_SIDE_LEFT, "LEFT", 0, "Left", ""},
	{SEQ_SIDE_RIGHT, "RIGHT", 0, "Right", ""},
	{0, NULL, 0, NULL, NULL},
};

typedef struct TransSeq {
	int start, machine;
	int startstill, endstill;
	int startdisp, enddisp;
	int startofs, endofs;
	int anim_startofs, anim_endofs;
	/* int final_left, final_right; */ /* UNUSED */
	int len;
} TransSeq;

/* ********************************************************************** */

/* ***************** proxy job manager ********************** */

typedef struct ProxyBuildJob {
	struct Main *main;
	struct Depsgraph *depsgraph;
	Scene *scene;
	ListBase queue;
	int stop;
} ProxyJob;

static void proxy_freejob(void *pjv)
{
	ProxyJob *pj = pjv;

	BLI_freelistN(&pj->queue);

	MEM_freeN(pj);
}

/* only this runs inside thread */
static void proxy_startjob(void *pjv, short *stop, short *do_update, float *progress)
{
	ProxyJob *pj = pjv;
	LinkData *link;

	for (link = pj->queue.first; link; link = link->next) {
		struct SeqIndexBuildContext *context = link->data;

		BKE_sequencer_proxy_rebuild(context, stop, do_update, progress);

		if (*stop) {
			pj->stop = 1;
			fprintf(stderr,  "Canceling proxy rebuild on users request...\n");
			break;
		}
	}
}

static void proxy_endjob(void *pjv)
{
	ProxyJob *pj = pjv;
	Editing *ed = BKE_sequencer_editing_get(pj->scene, false);
	LinkData *link;

	for (link = pj->queue.first; link; link = link->next) {
		BKE_sequencer_proxy_rebuild_finish(link->data, pj->stop);
	}

	BKE_sequencer_free_imbuf(pj->scene, &ed->seqbase, false);

	WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, pj->scene);
}

static void seq_proxy_build_job(const bContext *C)
{
	wmJob *wm_job;
	ProxyJob *pj;
	struct Depsgraph *depsgraph = CTX_data_depsgraph(C);
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	ScrArea *sa = CTX_wm_area(C);
	Sequence *seq;
	GSet *file_list;

	if (ed == NULL) {
		return;
	}

	wm_job = WM_jobs_get(CTX_wm_manager(C), CTX_wm_window(C), sa, "Building Proxies",
	                     WM_JOB_PROGRESS, WM_JOB_TYPE_SEQ_BUILD_PROXY);

	pj = WM_jobs_customdata_get(wm_job);

	if (!pj) {
		pj = MEM_callocN(sizeof(ProxyJob), "proxy rebuild job");

		pj->depsgraph = depsgraph;
		pj->scene = scene;
		pj->main = CTX_data_main(C);

		WM_jobs_customdata_set(wm_job, pj, proxy_freejob);
		WM_jobs_timer(wm_job, 0.1, NC_SCENE | ND_SEQUENCER, NC_SCENE | ND_SEQUENCER);
		WM_jobs_callbacks(wm_job, proxy_startjob, NULL, NULL, proxy_endjob);
	}

	file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");
	SEQP_BEGIN (ed, seq)
	{
		if ((seq->flag & SELECT)) {
			BKE_sequencer_proxy_rebuild_context(pj->main, pj->depsgraph, pj->scene, seq, file_list, &pj->queue);
		}
	} SEQ_END;

	BLI_gset_free(file_list, MEM_freeN);

	if (!WM_jobs_is_running(wm_job)) {
		G.is_break = false;
		WM_jobs_start(CTX_wm_manager(C), wm_job);
	}

	ED_area_tag_redraw(sa);
}

/* ********************************************************************** */

void seq_rectf(Sequence *seq, rctf *rectf)
{
	if (seq->startstill) {
		rectf->xmin = seq->start;
	}
	else {
		rectf->xmin = seq->startdisp;
	}

	rectf->ymin = seq->machine + SEQ_STRIP_OFSBOTTOM;
	if (seq->endstill) {
		rectf->xmax = seq->start + seq->len;
	}
	else {
		rectf->xmax = seq->enddisp;
	}
	rectf->ymax = seq->machine + SEQ_STRIP_OFSTOP;
}

void boundbox_seq(Scene *scene, rctf *rect)
{
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	float min[2], max[2];


	if (ed == NULL) {
		return;
	}

	min[0] = 0.0;
	max[0] = EFRA + 1;
	min[1] = 0.0;
	max[1] = 8.0;

	seq = ed->seqbasep->first;
	while (seq) {

		if (min[0] > seq->startdisp - 1) {
			min[0] = seq->startdisp - 1;
		}
		if (max[0] < seq->enddisp + 1) {
			max[0] = seq->enddisp + 1;
		}
		if (max[1] < seq->machine + 2) {
			max[1] = seq->machine + 2;
		}

		seq = seq->next;
	}

	rect->xmin = min[0];
	rect->xmax = max[0];
	rect->ymin = min[1];
	rect->ymax = max[1];

}

static int mouse_frame_side(View2D *v2d, short mouse_x, int frame)
{
	int mval[2];
	float mouseloc[2];

	mval[0] = mouse_x;
	mval[1] = 0;

	/* choose the side based on which side of the playhead the mouse is on */
	UI_view2d_region_to_view(v2d, mval[0], mval[1], &mouseloc[0], &mouseloc[1]);

	return mouseloc[0] > frame ? SEQ_SIDE_RIGHT : SEQ_SIDE_LEFT;
}


Sequence *find_neighboring_sequence(Scene *scene, Sequence *test, int lr, int sel)
{
	/* sel - 0==unselected, 1==selected, -1==done care*/
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	if (ed == NULL) {
		return NULL;
	}

	if (sel > 0) {
		sel = SELECT;
	}

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq != test) &&
		    (test->machine == seq->machine) &&
		    ((sel == -1) || (sel && (seq->flag & SELECT)) || (sel == 0 && (seq->flag & SELECT) == 0)))
		{
			switch (lr) {
				case SEQ_SIDE_LEFT:
					if (test->startdisp == (seq->enddisp)) {
						return seq;
					}
					break;
				case SEQ_SIDE_RIGHT:
					if (test->enddisp == (seq->startdisp)) {
						return seq;
					}
					break;
			}
		}
	}
	return NULL;
}

static Sequence *find_next_prev_sequence(Scene *scene, Sequence *test, int lr, int sel)
{
	/* sel - 0==unselected, 1==selected, -1==done care*/
	Sequence *seq, *best_seq = NULL;
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	int dist, best_dist;
	best_dist = MAXFRAME * 2;


	if (ed == NULL) {
		return NULL;
	}

	seq = ed->seqbasep->first;
	while (seq) {
		if ((seq != test) &&
		    (test->machine == seq->machine) &&
		    (test->depth == seq->depth) &&
		    ((sel == -1) || (sel == (seq->flag & SELECT))))
		{
			dist = MAXFRAME * 2;

			switch (lr) {
				case SEQ_SIDE_LEFT:
					if (seq->enddisp <= test->startdisp) {
						dist = test->enddisp - seq->startdisp;
					}
					break;
				case SEQ_SIDE_RIGHT:
					if (seq->startdisp >= test->enddisp) {
						dist = seq->startdisp - test->enddisp;
					}
					break;
			}

			if (dist == 0) {
				best_seq = seq;
				break;
			}
			else if (dist < best_dist) {
				best_dist = dist;
				best_seq = seq;
			}
		}
		seq = seq->next;
	}
	return best_seq; /* can be null */
}


Sequence *find_nearest_seq(Scene *scene, View2D *v2d, int *hand, const int mval[2])
{
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	float x, y;
	float pixelx;
	float handsize;
	float displen;
	*hand = SEQ_SIDE_NONE;


	if (ed == NULL) {
		return NULL;
	}

	pixelx = BLI_rctf_size_x(&v2d->cur) / BLI_rcti_size_x(&v2d->mask);

	UI_view2d_region_to_view(v2d, mval[0], mval[1], &x, &y);

	seq = ed->seqbasep->first;

	while (seq) {
		if (seq->machine == (int)y) {
			/* check for both normal strips, and strips that have been flipped horizontally */
			if (((seq->startdisp < seq->enddisp) && (seq->startdisp <= x && seq->enddisp >= x)) ||
			    ((seq->startdisp > seq->enddisp) && (seq->startdisp >= x && seq->enddisp <= x)) )
			{
				if (BKE_sequence_tx_test(seq)) {

					/* clamp handles to defined size in pixel space */

					handsize = seq->handsize;
					displen = (float)abs(seq->startdisp - seq->enddisp);

					/* don't even try to grab the handles of small strips */
					if (displen / pixelx > 16) {
						/* Set the max value to handle to 1/3 of the total len when its
						 * less than 28. This is important because otherwise selecting
						 * handles happens even when you click in the middle. */

						if ((displen / 3) < 30 * pixelx) {
							handsize = displen / 3;
						}
						else {
							CLAMP(handsize, 7 * pixelx, 30 * pixelx);
						}

						if (handsize + seq->startdisp >= x) {
							*hand = SEQ_SIDE_LEFT;
						}
						else if (-handsize + seq->enddisp <= x) {
							*hand = SEQ_SIDE_RIGHT;
						}
					}
				}
				return seq;
			}
		}
		seq = seq->next;
	}
	return NULL;
}


static bool seq_is_parent(Sequence *par, Sequence *seq)
{
	return ((par->seq1 == seq) || (par->seq2 == seq) || (par->seq3 == seq));
}

static bool seq_is_predecessor(Sequence *pred, Sequence *seq)
{
	if (!pred) { return 0; }
	if (pred == seq) { return 0; }
	else if (seq_is_parent(pred, seq)) { return 1; }
	else if (pred->seq1 && seq_is_predecessor(pred->seq1, seq)) { return 1; }
	else if (pred->seq2 && seq_is_predecessor(pred->seq2, seq)) { return 1; }
	else if (pred->seq3 && seq_is_predecessor(pred->seq3, seq)) { return 1; }

	return 0;
}

void ED_sequencer_deselect_all(Scene *scene)
{
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);


	if (ed == NULL) {
		return;
	}

	SEQP_BEGIN (ed, seq)
	{
		seq->flag &= ~SEQ_ALLSEL;
	} SEQ_END;

}

void recurs_sel_seq(Sequence *seqm)
{
	Sequence *seq;

	seq = seqm->seqbase.first;
	while (seq) {

		if (seqm->flag & (SEQ_LEFTSEL + SEQ_RIGHTSEL)) {
			seq->flag &= ~SEQ_ALLSEL;
		}
		else if (seqm->flag & SELECT) {
			seq->flag |= SELECT;
		}
		else {
			seq->flag &= ~SEQ_ALLSEL;
		}

		if (seq->seqbase.first) {
			recurs_sel_seq(seq);
		}

		seq = seq->next;
	}
}

bool ED_space_sequencer_maskedit_mask_poll(bContext *C)
{
	/* in this case both funcs are the same, for clip editor not */
	return ED_space_sequencer_maskedit_poll(C);
}

bool ED_space_sequencer_check_show_maskedit(SpaceSeq *sseq, Scene *scene)
{
	if (sseq && sseq->mainb == SEQ_DRAW_IMG_IMBUF) {
		return (BKE_sequencer_mask_get(scene) != NULL);
	}

	return false;
}

bool ED_space_sequencer_maskedit_poll(bContext *C)
{
	SpaceSeq *sseq = CTX_wm_space_seq(C);

	if (sseq) {
		Scene *scene = CTX_data_scene(C);
		return ED_space_sequencer_check_show_maskedit(sseq, scene);
	}

	return false;
}

/* are we displaying the seq output (not channels or histogram)*/
bool ED_space_sequencer_check_show_imbuf(SpaceSeq *sseq)
{
	return (ELEM(sseq->view, SEQ_VIEW_PREVIEW, SEQ_VIEW_SEQUENCE_PREVIEW) &&
	        ELEM(sseq->mainb, SEQ_DRAW_SEQUENCE, SEQ_DRAW_IMG_IMBUF));
}

bool ED_space_sequencer_check_show_strip(SpaceSeq *sseq)
{
	return (ELEM(sseq->view, SEQ_VIEW_SEQUENCE, SEQ_VIEW_SEQUENCE_PREVIEW) &&
	        ELEM(sseq->mainb, SEQ_DRAW_SEQUENCE, SEQ_DRAW_IMG_IMBUF));
}


int seq_effect_find_selected(Scene *scene, Sequence *activeseq, int type, Sequence **selseq1, Sequence **selseq2, Sequence **selseq3, const char **error_str)
{
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq1 = NULL, *seq2 = NULL, *seq3 = NULL, *seq;

	*error_str = NULL;

	if (!activeseq) {
		seq2 = BKE_sequencer_active_get(scene);
	}

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT) {
			if (seq->type == SEQ_TYPE_SOUND_RAM && BKE_sequence_effect_get_num_inputs(type) != 0) {
				*error_str = N_("Cannot apply effects to audio sequence strips");
				return 0;
			}
			if ((seq != activeseq) && (seq != seq2)) {
				if (seq2 == NULL) {
					seq2 = seq;
				}
				else if (seq1 == NULL) {
					seq1 = seq;
				}
				else if (seq3 == NULL) {
					seq3 = seq;
				}
				else {
					*error_str = N_("Cannot apply effect to more than 3 sequence strips");
					return 0;
				}
			}
		}
	}

	/* make sequence selection a little bit more intuitive
	 * for 3 strips: the last-strip should be sequence3 */
	if (seq3 != NULL && seq2 != NULL) {
		Sequence *tmp = seq2;
		seq2 = seq3;
		seq3 = tmp;
	}


	switch (BKE_sequence_effect_get_num_inputs(type)) {
		case 0:
			*selseq1 = *selseq2 = *selseq3 = NULL;
			return 1; /* success */
		case 1:
			if (seq2 == NULL) {
				*error_str = N_("At least one selected sequence strip is needed");
				return 0;
			}
			if (seq1 == NULL) {
				seq1 = seq2;
			}
			if (seq3 == NULL) {
				seq3 = seq2;
			}
			ATTR_FALLTHROUGH;
		case 2:
			if (seq1 == NULL || seq2 == NULL) {
				*error_str = N_("2 selected sequence strips are needed");
				return 0;
			}
			if (seq3 == NULL) {
				seq3 = seq2;
			}
			break;
	}

	if (seq1 == NULL && seq2 == NULL && seq3 == NULL) {
		*error_str = N_("TODO: in what cases does this happen?");
		return 0;
	}

	*selseq1 = seq1;
	*selseq2 = seq2;
	*selseq3 = seq3;

	return 1;
}

static Sequence *del_seq_find_replace_recurs(Scene *scene, Sequence *seq)
{
	Sequence *seq1, *seq2, *seq3;

	/* try to find a replacement input sequence, and flag for later deletion if
	 * no replacement can be found */

	if (!seq) {
		return NULL;
	}
	else if (!(seq->type & SEQ_TYPE_EFFECT)) {
		return ((seq->flag & SELECT) ? NULL : seq);
	}
	else if (!(seq->flag & SELECT)) {
		/* try to find replacement for effect inputs */
		seq1 = del_seq_find_replace_recurs(scene, seq->seq1);
		seq2 = del_seq_find_replace_recurs(scene, seq->seq2);
		seq3 = del_seq_find_replace_recurs(scene, seq->seq3);

		if (seq1 == seq->seq1 && seq2 == seq->seq2 && seq3 == seq->seq3) {
			/* pass */
		}
		else if (seq1 || seq2 || seq3) {
			seq->seq1 = (seq1) ? seq1 : (seq2) ? seq2 : seq3;
			seq->seq2 = (seq2) ? seq2 : (seq1) ? seq1 : seq3;
			seq->seq3 = (seq3) ? seq3 : (seq1) ? seq1 : seq2;

			BKE_sequencer_update_changed_seq_and_deps(scene, seq, 1, 1);
		}
		else {
			seq->flag |= SELECT;  /* mark for delete */
		}
	}

	if (seq->flag & SELECT) {
		if ((seq1 = del_seq_find_replace_recurs(scene, seq->seq1))) { return seq1; }
		if ((seq2 = del_seq_find_replace_recurs(scene, seq->seq2))) { return seq2; }
		if ((seq3 = del_seq_find_replace_recurs(scene, seq->seq3))) { return seq3; }
		else {
			return NULL;
		}
	}
	else {
		return seq;
	}
}

static void del_seq_clear_modifiers_recurs(Scene *scene, Sequence *deleting_sequence)
{
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *current_sequence;

	SEQP_BEGIN(ed, current_sequence)
	{
		if (!(current_sequence->flag & SELECT) && current_sequence != deleting_sequence) {
			SequenceModifierData *smd;

			for (smd = current_sequence->modifiers.first; smd; smd = smd->next) {
				if (smd->mask_sequence == deleting_sequence) {
					smd->mask_sequence = NULL;
				}
			}
		}
	} SEQ_END;
}

static void recurs_del_seq_flag(Scene *scene, ListBase *lb, short flag, short deleteall)
{
	Sequence *seq, *seqn;
	Sequence *last_seq = BKE_sequencer_active_get(scene);

	seq = lb->first;
	while (seq) {
		seqn = seq->next;
		if ((seq->flag & flag) || deleteall) {
			BLI_remlink(lb, seq);
			if (seq == last_seq) {
				BKE_sequencer_active_set(scene, NULL);
			}
			if (seq->type == SEQ_TYPE_META) {
				recurs_del_seq_flag(scene, &seq->seqbase, flag, 1);
			}
			BKE_sequence_free(scene, seq);
		}
		seq = seqn;
	}
}


static Sequence *cut_seq_hard(Scene *scene, Sequence *seq, ListBase *new_seq_list, int cutframe)
{
	TransSeq ts;
	Sequence *seqn = NULL;
	bool skip_dup = false;

	/* Unlike soft-cut, it's important to use the same value for both strips. */
	const bool is_end_exact = ((seq->start + seq->len) == cutframe);

	/* backup values */
	ts.start = seq->start;
	ts.machine = seq->machine;
	ts.startstill = seq->startstill;
	ts.endstill = seq->endstill;
	ts.startdisp = seq->startdisp;
	ts.enddisp = seq->enddisp;
	ts.startofs = seq->startofs;
	ts.endofs = seq->endofs;
	ts.anim_startofs = seq->anim_startofs;
	ts.anim_endofs = seq->anim_endofs;
	ts.len = seq->len;

	/* First Strip! */
	/* strips with extended stillfames before */

	/* Precaution, needed because the length saved on-disk may not match the length saved in the blend file,
	 * or our code may have minor differences reading file length between versions.
	 * This causes hard-cut to fail, see: T47862 */
	if (seq->type != SEQ_TYPE_META) {
		BKE_sequence_reload_new_file(scene, seq, true);
		BKE_sequence_calc(scene, seq);
	}

	/* Important to offset the start when 'cutframe == seq->start'
	 * because we need at least one frame of content after start/end still have clipped it. */
	if ((seq->startstill) && (cutframe <= seq->start)) {
		/* don't do funny things with METAs ... */
		if (seq->type == SEQ_TYPE_META) {
			skip_dup = true;
			seq->startstill = seq->start - cutframe;
		}
		else {
			seq->start = cutframe - 1;
			seq->startstill = cutframe - seq->startdisp - 1;
			seq->anim_endofs += seq->len - 1;
			seq->endstill = 0;
		}
	}
	/* normal strip */
	else if ((is_end_exact == false) &&
	         ((cutframe >= seq->start) && (cutframe <= (seq->start + seq->len))))
	{
		seq->endofs = 0;
		seq->endstill = 0;
		seq->anim_endofs += (seq->start + seq->len) - cutframe;
	}
	/* strips with extended stillframes after */
	else if ((is_end_exact == true) ||
	         (((seq->start + seq->len) < cutframe) && (seq->endstill)))
	{
		seq->endstill -= seq->enddisp - cutframe;
		/* don't do funny things with METAs ... */
		if (seq->type == SEQ_TYPE_META) {
			skip_dup = true;
		}
	}

	BKE_sequence_reload_new_file(scene, seq, false);
	BKE_sequence_calc(scene, seq);

	if (!skip_dup) {
		/* Duplicate AFTER the first change */
		seqn = BKE_sequence_dupli_recursive(scene, scene, new_seq_list, seq, SEQ_DUPE_UNIQUE_NAME | SEQ_DUPE_ANIM);
	}

	if (seqn) {
		seqn->flag |= SELECT;

		/* Important not to re-assign this (unlike soft-cut) */
#if 0
		is_end_exact = ((seqn->start + seqn->len) == cutframe);
#endif
		/* Second Strip! */
		/* strips with extended stillframes before */
		if ((seqn->startstill) && (cutframe == seqn->start + 1)) {
			seqn->start = ts.start;
			seqn->startstill = ts.start - cutframe;
			seqn->anim_endofs = ts.anim_endofs;
			seqn->endstill = ts.endstill;
		}

		/* normal strip */
		else if ((is_end_exact == false) &&
		         ((cutframe >= seqn->start) && (cutframe <= (seqn->start + seqn->len))))
		{
			seqn->start = cutframe;
			seqn->startstill = 0;
			seqn->startofs = 0;
			seqn->endofs = ts.endofs;
			seqn->anim_startofs += cutframe - ts.start;
			seqn->anim_endofs = ts.anim_endofs;
			seqn->endstill = ts.endstill;
		}

		/* strips with extended stillframes after */
		else if ((is_end_exact == true) ||
		         (((seqn->start + seqn->len) < cutframe) && (seqn->endstill)))
		{
			seqn->start = cutframe;
			seqn->startofs = 0;
			seqn->anim_startofs += ts.len - 1;
			seqn->endstill = ts.enddisp - cutframe - 1;
			seqn->startstill = 0;
		}

		BKE_sequence_reload_new_file(scene, seqn, false);
		BKE_sequence_calc(scene, seqn);
	}
	return seqn;
}

static Sequence *cut_seq_soft(Scene *scene, Sequence *seq, ListBase *new_seq_list, int cutframe)
{
	TransSeq ts;
	Sequence *seqn = NULL;
	bool skip_dup = false;

	bool is_end_exact = ((seq->start + seq->len) == cutframe);

	/* backup values */
	ts.start = seq->start;
	ts.machine = seq->machine;
	ts.startstill = seq->startstill;
	ts.endstill = seq->endstill;
	ts.startdisp = seq->startdisp;
	ts.enddisp = seq->enddisp;
	ts.startofs = seq->startofs;
	ts.endofs = seq->endofs;
	ts.anim_startofs = seq->anim_startofs;
	ts.anim_endofs = seq->anim_endofs;
	ts.len = seq->len;

	/* First Strip! */
	/* strips with extended stillfames before */

	/* Important to offset the start when 'cutframe == seq->start'
	 * because we need at least one frame of content after start/end still have clipped it. */
	if ((seq->startstill) && (cutframe <= seq->start)) {
		/* don't do funny things with METAs ... */
		if (seq->type == SEQ_TYPE_META) {
			skip_dup = true;
			seq->startstill = seq->start - cutframe;
		}
		else {
			seq->start = cutframe - 1;
			seq->startstill = cutframe - seq->startdisp - 1;
			seq->endofs = seq->len - 1;
			seq->endstill = 0;
		}
	}
	/* normal strip */
	else if ((is_end_exact == false) &&
	         (cutframe >= seq->start) && (cutframe <= (seq->start + seq->len)))
	{
		seq->endofs = (seq->start + seq->len) - cutframe;
	}
	/* strips with extended stillframes after */
	else if ((is_end_exact == true) ||
	         (((seq->start + seq->len) < cutframe) && (seq->endstill)))
	{
		seq->endstill -= seq->enddisp - cutframe;
		/* don't do funny things with METAs ... */
		if (seq->type == SEQ_TYPE_META) {
			skip_dup = true;
		}
	}

	BKE_sequence_calc(scene, seq);

	if (!skip_dup) {
		/* Duplicate AFTER the first change */
		seqn = BKE_sequence_dupli_recursive(scene, scene, new_seq_list, seq, SEQ_DUPE_UNIQUE_NAME | SEQ_DUPE_ANIM);
	}

	if (seqn) {
		seqn->flag |= SELECT;

		is_end_exact = ((seqn->start + seqn->len) == cutframe);

		/* Second Strip! */
		/* strips with extended stillframes before */
		if ((seqn->startstill) && (cutframe == seqn->start + 1)) {
			seqn->start = ts.start;
			seqn->startstill = ts.start - cutframe;
			seqn->endofs = ts.endofs;
			seqn->endstill = ts.endstill;
		}

		/* normal strip */
		else if ((is_end_exact == false) &&
		         (cutframe >= seqn->start) && (cutframe <= (seqn->start + seqn->len)))
		{
			seqn->startstill = 0;
			seqn->startofs = cutframe - ts.start;
			seqn->endofs = ts.endofs;
			seqn->endstill = ts.endstill;
		}

		/* strips with extended stillframes after */
		else if ((is_end_exact == true) ||
		         (((seqn->start + seqn->len) < cutframe) && (seqn->endstill)))
		{
			seqn->start = cutframe - ts.len + 1;
			seqn->startofs = ts.len - 1;
			seqn->endstill = ts.enddisp - cutframe - 1;
			seqn->startstill = 0;
		}

		BKE_sequence_calc(scene, seqn);
	}
	return seqn;
}


/* like duplicate, but only duplicate and cut overlapping strips,
 * strips to the left of the cutframe are ignored and strips to the right
 * are moved to the end of slist
 * we have to work on the same slist (not using a separate list), since
 * otherwise dupli_seq can't check for duplicate names properly and
 * may generate strips with the same name (which will mess up animdata)
 */

static bool cut_seq_list(Scene *scene, ListBase *slist, int cutframe,
                         Sequence * (*cut_seq)(Scene *, Sequence *, ListBase *, int))
{
	Sequence *seq, *seq_next_iter;
	Sequence *seq_first_new = NULL;

	seq = slist->first;

	while (seq && seq != seq_first_new) {
		seq_next_iter = seq->next; /* we need this because we may remove seq */
		seq->tmp = NULL;
		if (seq->flag & SELECT) {
			if (cutframe > seq->startdisp &&
			    cutframe < seq->enddisp)
			{
				Sequence *seqn = cut_seq(scene, seq, slist, cutframe);
				if (seqn) {
					if (seq_first_new == NULL) {
						seq_first_new = seqn;
					}
				}
			}
			else if (seq->enddisp <= cutframe) {
				/* do nothing */
			}
			else if (seq->startdisp >= cutframe) {
				/* move to tail */
				BLI_remlink(slist, seq);
				BLI_addtail(slist, seq);

				if (seq_first_new == NULL) {
					seq_first_new = seq;
				}
			}
		}
		seq = seq_next_iter;
	}

	return (seq_first_new != NULL);
}

static bool sequence_offset_after_frame(Scene *scene, const int delta, const int cfra)
{
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	bool done = false;
	TimeMarker *marker;

	/* all strips >= cfra are shifted */

	if (ed == NULL) {
		return 0;
	}

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->startdisp >= cfra) {
			BKE_sequence_translate(scene, seq, delta);
			BKE_sequence_calc(scene, seq);
			done = true;
		}
	}

	if (!scene->toolsettings->lock_markers) {
		for (marker = scene->markers.first; marker; marker = marker->next) {
			if (marker->frame >= cfra) {
				marker->frame += delta;
			}
		}
	}

	return done;
}

#if 0
static void set_filter_seq(Scene *scene)
{
	Sequence *seq;
	Editing *ed = BKE_sequencer_editing_get(scene, false);


	if (ed == NULL) return;

	if (okee("Set Deinterlace") == 0) return;

	SEQP_BEGIN (ed, seq)
	{
		if (seq->flag & SELECT) {
			if (seq->type == SEQ_TYPE_MOVIE) {
				seq->flag |= SEQ_FILTERY;
				BKE_sequence_reload_new_file(scene, seq, false);
				BKE_sequence_calc(scene, seq);
			}

		}
	} SEQ_END;
}
#endif

static void UNUSED_FUNCTION(seq_remap_paths) (Scene *scene)
{
	Sequence *seq, *last_seq = BKE_sequencer_active_get(scene);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	char from[FILE_MAX], to[FILE_MAX], stripped[FILE_MAX];


	if (last_seq == NULL) {
		return;
	}

	BLI_strncpy(from, last_seq->strip->dir, sizeof(from));
// XXX	if (0 == sbutton(from, 0, sizeof(from) - 1, "From: "))
//		return;

	BLI_strncpy(to, from, sizeof(to));
// XXX	if (0 == sbutton(to, 0, sizeof(to) - 1, "To: "))
//		return;

	if (STREQ(to, from)) {
		return;
	}

	SEQP_BEGIN (ed, seq)
	{
		if (seq->flag & SELECT) {
			if (STREQLEN(seq->strip->dir, from, strlen(from))) {
				printf("found %s\n", seq->strip->dir);

				/* strip off the beginning */
				stripped[0] = 0;
				BLI_strncpy(stripped, seq->strip->dir + strlen(from), FILE_MAX);

				/* new path */
				BLI_snprintf(seq->strip->dir, sizeof(seq->strip->dir), "%s%s", to, stripped);
				printf("new %s\n", seq->strip->dir);
			}
		}
	} SEQ_END;

}


static int sequencer_gap_remove_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	rctf rectf;
	int cfra, efra, sfra;
	bool first = false, done;
	bool do_all = RNA_boolean_get(op->ptr, "all");

	/* get first and last frame */
	boundbox_seq(scene, &rectf);
	sfra = (int)rectf.xmin;
	efra = (int)rectf.xmax;

	/* first check if the current frame has a gap already */
	for (cfra = CFRA; cfra >= sfra; cfra--) {
		if (BKE_sequencer_evaluate_frame(scene, cfra)) {
			first = true;
			break;
		}
	}

	for ( ; cfra < efra; cfra++) {
		/* first == 0 means there's still no strip to remove a gap for */
		if (first == false) {
			if (BKE_sequencer_evaluate_frame(scene, cfra) ) {
				first = true;
			}
		}
		else if (BKE_sequencer_evaluate_frame(scene, cfra) == 0) {
			done = true;
			while (BKE_sequencer_evaluate_frame(scene, cfra) == 0) {
				done = sequence_offset_after_frame(scene, -1, cfra);
				if (done == false) {
					break;
				}
			}
			if (done == false || do_all == false) {
				break;
			}
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;

}


void SEQUENCER_OT_gap_remove(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Remove Gaps";
	ot->idname = "SEQUENCER_OT_gap_remove";
	ot->description = "Remove gap at current frame to first strip at the right, independent of selection or locked state of strips";

	/* api callbacks */
//	ot->invoke = sequencer_snap_invoke;
	ot->exec = sequencer_gap_remove_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "all", 0, "All Gaps", "Do all gaps to right of current frame");
}

static int sequencer_gap_insert_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	int frames = RNA_int_get(op->ptr, "frames");

	sequence_offset_after_frame(scene, frames, CFRA);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;

}

void SEQUENCER_OT_gap_insert(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Insert Gaps";
	ot->idname = "SEQUENCER_OT_gap_insert";
	ot->description = "Insert gap at current frame to first strips at the right, independent of selection or locked state of strips";

	/* api callbacks */
	//	ot->invoke = sequencer_snap_invoke;
	ot->exec = sequencer_gap_insert_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_int(ot->srna, "frames", 10, 0, INT_MAX, "Frames", "Frames to insert after current strip", 0, 1000);
}


#if 0
static int seq_get_snaplimit(View2D *v2d)
{
	/* fake mouse coords to get the snap value
	 * a bit lazy but its only done once pre transform */
	float xmouse, ymouse, x;
	int mval[2] = {24, 0}; /* 24 screen px snap */

	UI_view2d_region_to_view(v2d, mval[0], mval[1], &xmouse, &ymouse);
	x = xmouse;
	mval[0] = 0;
	UI_view2d_region_to_view(v2d, mval[0], mval[1], &xmouse, &ymouse);
	return (int)(x - xmouse);
}
#endif

/* Operator functions */
bool sequencer_edit_poll(bContext *C)
{
	return (BKE_sequencer_editing_get(CTX_data_scene(C), false) != NULL);
}

#if 0 /* UNUSED */
bool sequencer_strip_poll(bContext *C)
{
	Editing *ed;
	return (((ed = BKE_sequencer_editing_get(CTX_data_scene(C), false)) != NULL) && (ed->act_seq != NULL));
}
#endif

bool sequencer_strip_has_path_poll(bContext *C)
{
	Editing *ed;
	Sequence *seq;
	return (((ed = BKE_sequencer_editing_get(CTX_data_scene(C), false)) != NULL) && ((seq = ed->act_seq) != NULL) && (SEQ_HAS_PATH(seq)));
}

bool sequencer_view_preview_poll(bContext *C)
{
	SpaceSeq *sseq = CTX_wm_space_seq(C);
	Editing *ed = BKE_sequencer_editing_get(CTX_data_scene(C), false);
	if (ed && sseq && (sseq->mainb == SEQ_DRAW_IMG_IMBUF)) {
		return 1;
	}

	return 0;
}

bool sequencer_view_strips_poll(bContext *C)
{
	SpaceSeq *sseq = CTX_wm_space_seq(C);
	if (sseq && ED_space_sequencer_check_show_strip(sseq)) {
		return 1;
	}

	return 0;
}

/* snap operator*/
static int sequencer_snap_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);

	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	int snap_frame;

	snap_frame = RNA_int_get(op->ptr, "frame");

	/* also check metas */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT && !(seq->depth == 0 && seq->flag & SEQ_LOCK) &&
		    BKE_sequence_tx_test(seq))
		{
			if ((seq->flag & (SEQ_LEFTSEL + SEQ_RIGHTSEL)) == 0) {
				/* simple but no anim update */
				/* seq->start = snap_frame-seq->startofs+seq->startstill; */

				BKE_sequence_translate(scene, seq, (snap_frame - seq->startofs + seq->startstill) - seq->start);
			}
			else {
				if (seq->flag & SEQ_LEFTSEL) {
					BKE_sequence_tx_set_final_left(seq, snap_frame);
				}
				else { /* SEQ_RIGHTSEL */
					BKE_sequence_tx_set_final_right(seq, snap_frame);
				}
				BKE_sequence_tx_handle_xlimits(seq, seq->flag & SEQ_LEFTSEL, seq->flag & SEQ_RIGHTSEL);
				BKE_sequence_single_fix(seq);
			}
			BKE_sequence_calc(scene, seq);
		}
	}

	/* test for effects and overlap
	 * don't use SEQP_BEGIN since that would be recursive */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT && !(seq->depth == 0 && seq->flag & SEQ_LOCK)) {
			seq->flag &= ~SEQ_OVERLAP;
			if (BKE_sequence_test_overlap(ed->seqbasep, seq) ) {
				BKE_sequence_base_shuffle(ed->seqbasep, seq, scene);
			}
		}
		else if (seq->type & SEQ_TYPE_EFFECT) {
			if (seq->seq1 && (seq->seq1->flag & SELECT)) {
				BKE_sequence_calc(scene, seq);
			}
			else if (seq->seq2 && (seq->seq2->flag & SELECT)) {
				BKE_sequence_calc(scene, seq);
			}
			else if (seq->seq3 && (seq->seq3->flag & SELECT)) {
				BKE_sequence_calc(scene, seq);
			}
		}
	}

	/* as last: */
	BKE_sequencer_sort(scene);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

static int sequencer_snap_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	Scene *scene = CTX_data_scene(C);

	int snap_frame;

	snap_frame = CFRA;

	RNA_int_set(op->ptr, "frame", snap_frame);
	return sequencer_snap_exec(C, op);
}

void SEQUENCER_OT_snap(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Snap Strips to Frame";
	ot->idname = "SEQUENCER_OT_snap";
	ot->description = "Frame where selected strips will be snapped";

	/* api callbacks */
	ot->invoke = sequencer_snap_invoke;
	ot->exec = sequencer_snap_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_int(ot->srna, "frame", 0, INT_MIN, INT_MAX, "Frame", "Frame where selected strips will be snapped", INT_MIN, INT_MAX);
}

typedef struct SlipData {
	int init_mouse[2];
	float init_mouseloc[2];
	TransSeq *ts;
	Sequence **seq_array;
	bool *trim;
	int num_seq;
	bool slow;
	int slow_offset; /* offset at the point where offset was turned on */
	NumInput num_input;
} SlipData;

static void transseq_backup(TransSeq *ts, Sequence *seq)
{
	ts->start = seq->start;
	ts->machine = seq->machine;
	ts->startstill = seq->startstill;
	ts->endstill = seq->endstill;
	ts->startdisp = seq->startdisp;
	ts->enddisp = seq->enddisp;
	ts->startofs = seq->startofs;
	ts->endofs = seq->endofs;
	ts->anim_startofs = seq->anim_startofs;
	ts->anim_endofs = seq->anim_endofs;
	ts->len = seq->len;
}


static void transseq_restore(TransSeq *ts, Sequence *seq)
{
	seq->start = ts->start;
	seq->machine = ts->machine;
	seq->startstill = ts->startstill;
	seq->endstill = ts->endstill;
	seq->startdisp = ts->startdisp;
	seq->enddisp = ts->enddisp;
	seq->startofs = ts->startofs;
	seq->endofs = ts->endofs;
	seq->anim_startofs = ts->anim_startofs;
	seq->anim_endofs = ts->anim_endofs;
	seq->len = ts->len;
}

static int slip_add_sequences_rec(ListBase *seqbasep, Sequence **seq_array, bool *trim, int offset, bool do_trim)
{
	Sequence *seq;
	int num_items = 0;

	for (seq = seqbasep->first; seq; seq = seq->next) {
		if (!do_trim || (!(seq->type & SEQ_TYPE_EFFECT) && (seq->flag & SELECT))) {
			seq_array[offset + num_items] = seq;
			trim[offset + num_items] = do_trim;
			num_items++;

			if (seq->type == SEQ_TYPE_META) {
				/* trim the sub-sequences */
				num_items += slip_add_sequences_rec(&seq->seqbase, seq_array, trim, num_items + offset, false);
			}
			else if (seq->type & SEQ_TYPE_EFFECT) {
				trim[offset + num_items] = false;
			}
		}
	}

	return num_items;
}

static int slip_count_sequences_rec(ListBase *seqbasep, bool first_level)
{
	Sequence *seq;
	int trimmed_sequences = 0;

	for (seq = seqbasep->first; seq; seq = seq->next) {
		if (!first_level || (!(seq->type & SEQ_TYPE_EFFECT) && (seq->flag & SELECT))) {
			trimmed_sequences++;

			if (seq->type == SEQ_TYPE_META) {
				/* trim the sub-sequences */
				trimmed_sequences += slip_count_sequences_rec(&seq->seqbase, false);
			}
		}
	}

	return trimmed_sequences;
}

static int sequencer_slip_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	SlipData *data;
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	float mouseloc[2];
	int num_seq, i;
	View2D *v2d = UI_view2d_fromcontext(C);

	/* first recursively count the trimmed elements */
	num_seq = slip_count_sequences_rec(ed->seqbasep, true);

	if (num_seq == 0) {
		return OPERATOR_CANCELLED;
	}

	data = op->customdata = MEM_mallocN(sizeof(SlipData), "trimdata");
	data->ts = MEM_mallocN(num_seq * sizeof(TransSeq), "trimdata_transform");
	data->seq_array = MEM_mallocN(num_seq * sizeof(Sequence *), "trimdata_sequences");
	data->trim = MEM_mallocN(num_seq * sizeof(bool), "trimdata_trim");
	data->num_seq = num_seq;

	initNumInput(&data->num_input);
	data->num_input.idx_max = 0;
	data->num_input.val_flag[0] |= NUM_NO_FRACTION;
	data->num_input.unit_sys = USER_UNIT_NONE;
	data->num_input.unit_type[0] = 0;


	slip_add_sequences_rec(ed->seqbasep, data->seq_array, data->trim, 0, true);

	for (i = 0; i < num_seq; i++) {
		transseq_backup(data->ts + i, data->seq_array[i]);
	}

	UI_view2d_region_to_view(v2d, event->mval[0], event->mval[1], &mouseloc[0], &mouseloc[1]);

	copy_v2_v2_int(data->init_mouse, event->mval);
	copy_v2_v2(data->init_mouseloc, mouseloc);

	data->slow = false;

	WM_event_add_modal_handler(C, op);

	/* notify so we draw extensions immediately */
	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_RUNNING_MODAL;
}

static bool sequencer_slip_recursively(Scene *scene, SlipData *data, int offset)
{

	/* only data types supported for now */
	if (offset != 0) {
		Editing *ed = BKE_sequencer_editing_get(scene, false);
		int i;

		/* we iterate in reverse so metastrips are iterated after their children */
		for (i = data->num_seq - 1; i >= 0; i--) {
			Sequence *seq = data->seq_array[i];
			int endframe;
			/* we have the offset, do the terrible math */

			/* first, do the offset */
			seq->start = data->ts[i].start + offset;

			if (data->trim[i]) {
				/* find the endframe */
				endframe = seq->start + seq->len;

				/* now compute the terrible offsets */
				if (endframe > seq->enddisp) {
					seq->endstill = 0;
					seq->endofs = endframe - seq->enddisp;
				}
				else if (endframe <= seq->enddisp) {
					seq->endstill = seq->enddisp - endframe;
					seq->endofs = 0;
				}

				if (seq->start > seq->startdisp) {
					seq->startstill = seq->start - seq->startdisp;
					seq->startofs = 0;
				}
				else if (seq->start <= seq->startdisp) {
					seq->startstill = 0;
					seq->startofs = seq->startdisp - seq->start;
				}
			}
			else {
				/* if no real trim, don't change the data, rather transform the strips themselves */
				seq->startdisp = data->ts[i].startdisp + offset;
				seq->enddisp = data->ts[i].enddisp + offset;
			}

			/* effects are only added if we they are in a metastrip. In this case, dependent strips will just be transformed and we can skip calculating for effects
			 * This way we can avoid an extra loop just for effects*/
			if (!(seq->type & SEQ_TYPE_EFFECT)) {
				BKE_sequence_calc(scene, seq);
			}
		}
		BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);

		return true;
	}

	return false;
}

static int sequencer_slip_exec(bContext *C, wmOperator *op)
{
	SlipData *data;
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	int num_seq, i;
	int offset = RNA_int_get(op->ptr, "offset");
	bool success = false;

	/* first recursively count the trimmed elements */
	num_seq = slip_count_sequences_rec(ed->seqbasep, true);

	if (num_seq == 0) {
		return OPERATOR_CANCELLED;
	}

	data = op->customdata = MEM_mallocN(sizeof(SlipData), "trimdata");
	data->ts = MEM_mallocN(num_seq * sizeof(TransSeq), "trimdata_transform");
	data->seq_array = MEM_mallocN(num_seq * sizeof(Sequence *), "trimdata_sequences");
	data->trim = MEM_mallocN(num_seq * sizeof(bool), "trimdata_trim");
	data->num_seq = num_seq;

	slip_add_sequences_rec(ed->seqbasep, data->seq_array, data->trim, 0, true);

	for (i = 0; i < num_seq; i++) {
		transseq_backup(data->ts + i, data->seq_array[i]);
	}

	success = sequencer_slip_recursively(scene, data, offset);

	MEM_freeN(data->seq_array);
	MEM_freeN(data->trim);
	MEM_freeN(data->ts);
	MEM_freeN(data);

	if (success) {
		WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
		return OPERATOR_FINISHED;
	}
	else {
		return OPERATOR_CANCELLED;
	}
}


static void sequencer_slip_update_header(Scene *scene, ScrArea *sa, SlipData *data, int offset)
{
	char msg[UI_MAX_DRAW_STR];

	if (sa) {
		if (hasNumInput(&data->num_input)) {
			char num_str[NUM_STR_REP_LEN];
			outputNumInput(&data->num_input, num_str, &scene->unit);
			BLI_snprintf(msg, sizeof(msg), IFACE_("Trim offset: %s"), num_str);
		}
		else {
			BLI_snprintf(msg, sizeof(msg), IFACE_("Trim offset: %d"), offset);
		}
	}

	ED_area_status_text(sa, msg);
}

static int sequencer_slip_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	Scene *scene = CTX_data_scene(C);
	SlipData *data = (SlipData *)op->customdata;
	ScrArea *sa = CTX_wm_area(C);
	const bool has_numInput = hasNumInput(&data->num_input);
	bool handled = true;

	/* Modal numinput active, try to handle numeric inputs first... */
	if (event->val == KM_PRESS && has_numInput && handleNumInput(C, &data->num_input, event)) {
		float offset;
		applyNumInput(&data->num_input, &offset);

		sequencer_slip_update_header(scene, sa, data, (int)offset);

		RNA_int_set(op->ptr, "offset", offset);

		if (sequencer_slip_recursively(scene, data, offset)) {
			WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
		}

		return OPERATOR_RUNNING_MODAL;
	}

	switch (event->type) {
		case MOUSEMOVE:
		{
			if (!has_numInput) {
				float mouseloc[2];
				int offset;
				int mouse_x;
				View2D *v2d = UI_view2d_fromcontext(C);

				if (data->slow) {
					mouse_x = event->mval[0] - data->slow_offset;
					mouse_x *= 0.1f;
					mouse_x += data->slow_offset;
				}
				else {
					mouse_x = event->mval[0];
				}


				/* choose the side based on which side of the playhead the mouse is on */
				UI_view2d_region_to_view(v2d, mouse_x, 0, &mouseloc[0], &mouseloc[1]);
				offset = mouseloc[0] - data->init_mouseloc[0];

				sequencer_slip_update_header(scene, sa, data, offset);

				RNA_int_set(op->ptr, "offset", offset);

				if (sequencer_slip_recursively(scene, data, offset)) {
					WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
				}
			}
			break;
		}

		case LEFTMOUSE:
		case RETKEY:
		case SPACEKEY:
		{
			MEM_freeN(data->seq_array);
			MEM_freeN(data->trim);
			MEM_freeN(data->ts);
			MEM_freeN(data);
			op->customdata = NULL;
			if (sa) {
				ED_area_status_text(sa, NULL);
			}
			WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
			return OPERATOR_FINISHED;
		}

		case ESCKEY:
		case RIGHTMOUSE:
		{
			int i;
			Editing *ed = BKE_sequencer_editing_get(scene, false);

			for (i = 0; i < data->num_seq; i++) {
				transseq_restore(data->ts + i, data->seq_array[i]);
			}

			for (i = 0; i < data->num_seq; i++) {
				Sequence *seq = data->seq_array[i];
				BKE_sequence_reload_new_file(scene, seq, false);
				BKE_sequence_calc(scene, seq);
			}

			MEM_freeN(data->seq_array);
			MEM_freeN(data->ts);
			MEM_freeN(data->trim);
			MEM_freeN(data);
			op->customdata = NULL;

			WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

			BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);

			if (sa) {
				ED_area_status_text(sa, NULL);
			}

			return OPERATOR_CANCELLED;
		}

		case RIGHTSHIFTKEY:
		case LEFTSHIFTKEY:
			if (!has_numInput) {
				if (event->val == KM_PRESS) {
					data->slow = true;
					data->slow_offset = event->mval[0];
				}
				else if (event->val == KM_RELEASE) {
					data->slow = false;
				}
			}
			break;

		default:
			handled = false;
			break;
	}

	/* Modal numinput inactive, try to handle numeric inputs last... */
	if (!handled && event->val == KM_PRESS && handleNumInput(C, &data->num_input, event)) {
		float offset;
		applyNumInput(&data->num_input, &offset);

		sequencer_slip_update_header(scene, sa, data, (int)offset);

		RNA_int_set(op->ptr, "offset", offset);

		if (sequencer_slip_recursively(scene, data, offset)) {
			WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
		}
	}

	return OPERATOR_RUNNING_MODAL;
}

void SEQUENCER_OT_slip(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Trim Strips";
	ot->idname = "SEQUENCER_OT_slip";
	ot->description = "Trim the contents of the active strip";

	/* api callbacks */
	ot->invoke = sequencer_slip_invoke;
	ot->modal = sequencer_slip_modal;
	ot->exec = sequencer_slip_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_int(ot->srna, "offset", 0, INT32_MIN, INT32_MAX, "Offset", "Offset to the data of the strip",
	            INT32_MIN, INT32_MAX);
}

/* mute operator */
static int sequencer_mute_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	bool selected;

	selected = !RNA_boolean_get(op->ptr, "unselected");

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->flag & SEQ_LOCK) == 0) {
			if (selected) { /* mute unselected */
				if (seq->flag & SELECT) {
					seq->flag |= SEQ_MUTE;
					BKE_sequence_invalidate_dependent(scene, seq);
				}
			}
			else {
				if ((seq->flag & SELECT) == 0) {
					seq->flag |= SEQ_MUTE;
					BKE_sequence_invalidate_dependent(scene, seq);
				}
			}
		}
	}

	BKE_sequencer_update_muting(ed);
	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_mute(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Mute Strips";
	ot->idname = "SEQUENCER_OT_mute";
	ot->description = "Mute (un)selected strips";

	/* api callbacks */
	ot->exec = sequencer_mute_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Mute unselected rather than selected strips");
}


/* unmute operator */
static int sequencer_unmute_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	bool selected;

	selected = !RNA_boolean_get(op->ptr, "unselected");

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->flag & SEQ_LOCK) == 0) {
			if (selected) { /* unmute unselected */
				if (seq->flag & SELECT) {
					seq->flag &= ~SEQ_MUTE;
					BKE_sequence_invalidate_dependent(scene, seq);
				}
			}
			else {
				if ((seq->flag & SELECT) == 0) {
					seq->flag &= ~SEQ_MUTE;
					BKE_sequence_invalidate_dependent(scene, seq);
				}
			}
		}
	}

	BKE_sequencer_update_muting(ed);
	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_unmute(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Unmute Strips";
	ot->idname = "SEQUENCER_OT_unmute";
	ot->description = "Unmute (un)selected strips";

	/* api callbacks */
	ot->exec = sequencer_unmute_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Unmute unselected rather than selected strips");
}


/* lock operator */
static int sequencer_lock_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT) {
			seq->flag |= SEQ_LOCK;
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_lock(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Lock Strips";
	ot->idname = "SEQUENCER_OT_lock";
	ot->description = "Lock strips so they can't be transformed";

	/* api callbacks */
	ot->exec = sequencer_lock_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* unlock operator */
static int sequencer_unlock_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT) {
			seq->flag &= ~SEQ_LOCK;
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_unlock(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Unlock Strips";
	ot->idname = "SEQUENCER_OT_unlock";
	ot->description = "Unlock strips so they can be transformed";

	/* api callbacks */
	ot->exec = sequencer_unlock_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* reload operator */
static int sequencer_reload_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	const bool adjust_length = RNA_boolean_get(op->ptr, "adjust_length");

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT) {
			BKE_sequencer_update_changed_seq_and_deps(scene, seq, 0, 1);
			BKE_sequence_reload_new_file(scene, seq, !adjust_length);

			if (adjust_length) {
				if (BKE_sequence_test_overlap(ed->seqbasep, seq)) {
					BKE_sequence_base_shuffle(ed->seqbasep, seq, scene);
				}
			}
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_reload(struct wmOperatorType *ot)
{
	PropertyRNA *prop;

	/* identifiers */
	ot->name = "Reload Strips";
	ot->idname = "SEQUENCER_OT_reload";
	ot->description = "Reload strips in the sequencer";

	/* api callbacks */
	ot->exec = sequencer_reload_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER; /* no undo, the data changed is stored outside 'main' */

	prop = RNA_def_boolean(ot->srna, "adjust_length", 0, "Adjust Length",
	                       "Adjust length of strips to their data length");
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}

/* reload operator */
static bool sequencer_refresh_all_poll(bContext *C)
{
	if (G.is_rendering) {
		return 0;
	}
	return sequencer_edit_poll(C);
}

static int sequencer_refresh_all_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_refresh_all(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Refresh Sequencer";
	ot->idname = "SEQUENCER_OT_refresh_all";
	ot->description = "Refresh the sequencer editor";

	/* api callbacks */
	ot->exec = sequencer_refresh_all_exec;
	ot->poll = sequencer_refresh_all_poll;
}

static int sequencer_reassign_inputs_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Sequence *seq1, *seq2, *seq3, *last_seq = BKE_sequencer_active_get(scene);
	const char *error_msg;

	if (!seq_effect_find_selected(scene, last_seq, last_seq->type, &seq1, &seq2, &seq3, &error_msg)) {
		BKE_report(op->reports, RPT_ERROR, error_msg);
		return OPERATOR_CANCELLED;
	}
	/* see reassigning would create a cycle */
	if (seq_is_predecessor(seq1, last_seq) ||
	    seq_is_predecessor(seq2, last_seq) ||
	    seq_is_predecessor(seq3, last_seq))
	{
		BKE_report(op->reports, RPT_ERROR, "Cannot reassign inputs: no cycles allowed");
		return OPERATOR_CANCELLED;
	}

	last_seq->seq1 = seq1;
	last_seq->seq2 = seq2;
	last_seq->seq3 = seq3;

	BKE_sequencer_update_changed_seq_and_deps(scene, last_seq, 1, 1);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

static bool sequencer_effect_poll(bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	if (ed) {
		Sequence *last_seq = BKE_sequencer_active_get(scene);
		if (last_seq && (last_seq->type & SEQ_TYPE_EFFECT)) {
			return 1;
		}
	}

	return 0;
}

void SEQUENCER_OT_reassign_inputs(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Reassign Inputs";
	ot->idname = "SEQUENCER_OT_reassign_inputs";
	ot->description = "Reassign the inputs for the effect strip";

	/* api callbacks */
	ot->exec = sequencer_reassign_inputs_exec;
	ot->poll = sequencer_effect_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


static int sequencer_swap_inputs_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Sequence *seq, *last_seq = BKE_sequencer_active_get(scene);

	if (last_seq->seq1 == NULL || last_seq->seq2 == NULL) {
		BKE_report(op->reports, RPT_ERROR, "No valid inputs to swap");
		return OPERATOR_CANCELLED;
	}

	seq = last_seq->seq1;
	last_seq->seq1 = last_seq->seq2;
	last_seq->seq2 = seq;

	BKE_sequencer_update_changed_seq_and_deps(scene, last_seq, 1, 1);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}
void SEQUENCER_OT_swap_inputs(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Swap Inputs";
	ot->idname = "SEQUENCER_OT_swap_inputs";
	ot->description = "Swap the first two inputs for the effect strip";

	/* api callbacks */
	ot->exec = sequencer_swap_inputs_exec;
	ot->poll = sequencer_effect_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


/* cut operator */
static const EnumPropertyItem prop_cut_types[] = {
	{SEQ_CUT_SOFT, "SOFT", 0, "Soft", ""},
	{SEQ_CUT_HARD, "HARD", 0, "Hard", ""},
	{0, NULL, 0, NULL, NULL},
};

static int sequencer_cut_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	int cut_side, cut_hard, cut_frame;

	bool changed;

	cut_frame = RNA_int_get(op->ptr, "frame");
	cut_hard = RNA_enum_get(op->ptr, "type");
	cut_side = RNA_enum_get(op->ptr, "side");

	if (cut_hard == SEQ_CUT_HARD) {
		changed = cut_seq_list(scene, ed->seqbasep, cut_frame, cut_seq_hard);
	}
	else {
		changed = cut_seq_list(scene, ed->seqbasep, cut_frame, cut_seq_soft);
	}

	if (changed) { /* got new strips ? */
		Sequence *seq;

		if (cut_side != SEQ_SIDE_BOTH) {
			SEQP_BEGIN (ed, seq)
			{
				if (cut_side == SEQ_SIDE_LEFT) {
					if (seq->startdisp >= cut_frame) {
						seq->flag &= ~SEQ_ALLSEL;
					}
				}
				else {
					if (seq->enddisp <= cut_frame) {
						seq->flag &= ~SEQ_ALLSEL;
					}
				}
			}
			SEQ_END;
		}

		SEQP_BEGIN (ed, seq)
		{
			if (seq->seq1 || seq->seq2 || seq->seq3) {
				BKE_sequence_calc(scene, seq);
			}
		}
		SEQ_END;

		/* as last: */
		BKE_sequencer_sort(scene);
	}

	if (changed) {
		WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
		return OPERATOR_FINISHED;
	}
	else {
		return OPERATOR_CANCELLED;
	}
}


static int sequencer_cut_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	Scene *scene = CTX_data_scene(C);
	View2D *v2d = UI_view2d_fromcontext(C);

	int cut_side = RNA_enum_get(op->ptr, "side");
	int cut_frame = CFRA;

	if (cut_side == SEQ_SIDE_MOUSE) {
		if (ED_operator_sequencer_active(C) && v2d) {
			cut_side = mouse_frame_side(v2d, event->mval[0], cut_frame);
		}
		else {
			cut_side = SEQ_SIDE_BOTH;
		}
	}
	RNA_int_set(op->ptr, "frame", cut_frame);
	RNA_enum_set(op->ptr, "side", cut_side);
	/*RNA_enum_set(op->ptr, "type", cut_hard); */ /*This type is set from the key shortcut */
	return sequencer_cut_exec(C, op);
}


void SEQUENCER_OT_cut(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Cut Strips";
	ot->idname = "SEQUENCER_OT_cut";
	ot->description = "Cut the selected strips";

	/* api callbacks */
	ot->invoke = sequencer_cut_invoke;
	ot->exec = sequencer_cut_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	PropertyRNA *prop;
	RNA_def_int(ot->srna, "frame", 0, INT_MIN, INT_MAX, "Frame", "Frame where selected strips will be cut", INT_MIN, INT_MAX);
	RNA_def_enum(ot->srna, "type", prop_cut_types, SEQ_CUT_SOFT, "Type", "The type of cut operation to perform on strips");
	prop = RNA_def_enum(ot->srna, "side", prop_side_types, SEQ_SIDE_MOUSE, "Side", "The side that remains selected after cutting");
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}

#undef SEQ_SIDE_MOUSE

/* duplicate operator */
static int apply_unique_name_cb(Sequence *seq, void *arg_pt)
{
	Scene *scene = (Scene *)arg_pt;
	char name[sizeof(seq->name) - 2];

	BLI_strncpy_utf8(name, seq->name + 2, sizeof(name));
	BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seq);
	BKE_sequencer_dupe_animdata(scene, name, seq->name + 2);
	return 1;

}

static int sequencer_add_duplicate_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	ListBase nseqbase = {NULL, NULL};

	if (ed == NULL) {
		return OPERATOR_CANCELLED;
	}

	BKE_sequence_base_dupli_recursive(scene, scene, &nseqbase, ed->seqbasep, SEQ_DUPE_CONTEXT, 0);

	if (nseqbase.first) {
		Sequence *seq = nseqbase.first;
		/* rely on the nseqbase list being added at the end */
		BLI_movelisttolist(ed->seqbasep, &nseqbase);

		for (; seq; seq = seq->next) {
			BKE_sequencer_recursive_apply(seq, apply_unique_name_cb, scene);
		}

		WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
		return OPERATOR_FINISHED;
	}

	return OPERATOR_CANCELLED;
}

void SEQUENCER_OT_duplicate(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Duplicate Strips";
	ot->idname = "SEQUENCER_OT_duplicate";
	ot->description = "Duplicate the selected strips";

	/* api callbacks */
	ot->exec = sequencer_add_duplicate_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* to give to transform */
	RNA_def_enum(ot->srna, "mode", rna_enum_transform_mode_types, TFM_TRANSLATION, "Mode", "");
}

/* delete operator */
static int sequencer_delete_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	MetaStack *ms;
	bool nothing_selected = true;

	seq = BKE_sequencer_active_get(scene);
	if (seq && seq->flag & SELECT) { /* avoid a loop since this is likely to be selected */
		nothing_selected = false;
	}
	else {
		for (seq = ed->seqbasep->first; seq; seq = seq->next) {
			if (seq->flag & SELECT) {
				nothing_selected = false;
				break;
			}
		}
	}

	if (nothing_selected) {
		return OPERATOR_FINISHED;
	}

	/* for effects and modifiers, try to find a replacement input */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (!(seq->flag & SELECT)) {
			if ((seq->type & SEQ_TYPE_EFFECT)) {
				del_seq_find_replace_recurs(scene, seq);
			}
		}
		else {
			del_seq_clear_modifiers_recurs(scene, seq);
		}
	}

	/* delete all selected strips */
	recurs_del_seq_flag(scene, ed->seqbasep, SELECT, 0);

	/* updates lengths etc */
	seq = ed->seqbasep->first;
	while (seq) {
		BKE_sequence_calc(scene, seq);
		seq = seq->next;
	}

	/* free parent metas */
	ms = ed->metastack.last;
	while (ms) {
		BKE_sequence_calc(scene, ms->parseq);
		ms = ms->prev;
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

static int sequencer_delete_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	ARegion *ar = CTX_wm_region(C);

	if (ar->regiontype == RGN_TYPE_WINDOW) {
		/* bounding box of 30 pixels is used for markers shortcuts,
		 * prevent conflict with markers shortcuts here
		 */
		if (event->mval[1] <= 30) {
			return OPERATOR_PASS_THROUGH;
		}
	}

	return WM_operator_confirm(C, op, event);
}

void SEQUENCER_OT_delete(wmOperatorType *ot)
{

	/* identifiers */
	ot->name = "Erase Strips";
	ot->idname = "SEQUENCER_OT_delete";
	ot->description = "Erase selected strips from the sequencer";

	/* api callbacks */
	ot->invoke = sequencer_delete_invoke;
	ot->exec = sequencer_delete_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


/* offset clear operator */
static int sequencer_offset_clear_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;

	/* for effects, try to find a replacement input */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->type & SEQ_TYPE_EFFECT) == 0 && (seq->flag & SELECT)) {
			seq->startofs = seq->endofs = seq->startstill = seq->endstill = 0;
		}
	}

	/* updates lengths etc */
	seq = ed->seqbasep->first;
	while (seq) {
		BKE_sequence_calc(scene, seq);
		seq = seq->next;
	}

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->type & SEQ_TYPE_EFFECT) == 0 && (seq->flag & SELECT)) {
			if (BKE_sequence_test_overlap(ed->seqbasep, seq)) {
				BKE_sequence_base_shuffle(ed->seqbasep, seq, scene);
			}
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}


void SEQUENCER_OT_offset_clear(wmOperatorType *ot)
{

	/* identifiers */
	ot->name = "Clear Strip Offset";
	ot->idname = "SEQUENCER_OT_offset_clear";
	ot->description = "Clear strip offsets from the start and end frames";

	/* api callbacks */
	ot->exec = sequencer_offset_clear_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


/* separate_images operator */
static int sequencer_separate_images_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	Sequence *seq, *seq_new;
	Strip *strip_new;
	StripElem *se, *se_new;
	int start_ofs, cfra, frame_end;
	int step = RNA_int_get(op->ptr, "length");

	seq = ed->seqbasep->first; /* poll checks this is valid */

	while (seq) {
		if ((seq->flag & SELECT) && (seq->type == SEQ_TYPE_IMAGE) && (seq->len > 1)) {
			Sequence *seq_next;

			/* remove seq so overlap tests don't conflict,
			 * see seq_free_sequence below for the real free'ing */
			BLI_remlink(ed->seqbasep, seq);
			/* if (seq->ipo) id_us_min(&seq->ipo->id); */
			/* XXX, remove fcurve and assign to split image strips */

			start_ofs = cfra = BKE_sequence_tx_get_final_left(seq, false);
			frame_end = BKE_sequence_tx_get_final_right(seq, false);

			while (cfra < frame_end) {
				/* new seq */
				se = BKE_sequencer_give_stripelem(seq, cfra);

				seq_new = BKE_sequence_dupli_recursive(scene, scene, ed->seqbasep, seq, SEQ_DUPE_UNIQUE_NAME);

				seq_new->start = start_ofs;
				seq_new->type = SEQ_TYPE_IMAGE;
				seq_new->len = 1;
				seq_new->endstill = step - 1;

				/* new strip */
				strip_new = seq_new->strip;
				strip_new->us = 1;

				/* new stripdata (only one element now!) */
				/* Note this assume all elements (images) have the same dimension,
				 * since we only copy the name here. */
				se_new = MEM_reallocN(strip_new->stripdata, sizeof(*se_new));
				BLI_strncpy(se_new->name, se->name, sizeof(se_new->name));
				strip_new->stripdata = se_new;

				BKE_sequence_calc(scene, seq_new);

				if (step > 1) {
					seq_new->flag &= ~SEQ_OVERLAP;
					if (BKE_sequence_test_overlap(ed->seqbasep, seq_new)) {
						BKE_sequence_base_shuffle(ed->seqbasep, seq_new, scene);
					}
				}

				/* XXX, COPY FCURVES */

				cfra++;
				start_ofs += step;
			}

			seq_next = seq->next;
			BKE_sequence_free(scene, seq);
			seq = seq_next;
		}
		else {
			seq = seq->next;
		}
	}

	/* as last: */
	BKE_sequencer_sort(scene);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}


void SEQUENCER_OT_images_separate(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Separate Images";
	ot->idname = "SEQUENCER_OT_images_separate";
	ot->description = "On image sequence strips, it returns a strip for each image";

	/* api callbacks */
	ot->exec = sequencer_separate_images_exec;
	ot->invoke = WM_operator_props_popup_confirm;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_int(ot->srna, "length", 1, 1, INT_MAX, "Length", "Length of each frame", 1, 1000);
}


/* META Operators */

/* separate_meta_toggle operator */
static int sequencer_meta_toggle_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *last_seq = BKE_sequencer_active_get(scene);
	MetaStack *ms;

	if (last_seq && last_seq->type == SEQ_TYPE_META && last_seq->flag & SELECT) {
		/* Enter Metastrip */
		ms = MEM_mallocN(sizeof(MetaStack), "metastack");
		BLI_addtail(&ed->metastack, ms);
		ms->parseq = last_seq;
		ms->oldbasep = ed->seqbasep;
		copy_v2_v2_int(ms->disp_range, &ms->parseq->startdisp);

		ed->seqbasep = &last_seq->seqbase;

		BKE_sequencer_active_set(scene, NULL);

	}
	else {
		/* Exit Metastrip (if possible) */

		Sequence *seq;

		if (BLI_listbase_is_empty(&ed->metastack)) {
			return OPERATOR_CANCELLED;
		}

		ms = ed->metastack.last;
		BLI_remlink(&ed->metastack, ms);

		ed->seqbasep = ms->oldbasep;

		/* for old files, update from meta */
		if (ms->disp_range[0] ==  ms->disp_range[1]) {
			copy_v2_v2_int(ms->disp_range, &ms->parseq->startdisp);
		}

		/* recalc all: the meta can have effects connected to it */
		for (seq = ed->seqbasep->first; seq; seq = seq->next) {
			BKE_sequence_calc(scene, seq);
		}

		/* 2.73+, keeping endpoings is important!
		 * moving them around means you can't usefully use metas in a complex edit */
#if 1
		BKE_sequence_tx_set_final_left(ms->parseq, ms->disp_range[0]);
		BKE_sequence_tx_set_final_right(ms->parseq, ms->disp_range[1]);
		BKE_sequence_single_fix(ms->parseq);
		BKE_sequence_calc(scene, ms->parseq);
#else
		if (BKE_sequence_test_overlap(ed->seqbasep, ms->parseq)) {
			BKE_sequence_base_shuffle(ed->seqbasep, ms->parseq, scene);
		}
#endif

		BKE_sequencer_active_set(scene, ms->parseq);

		ms->parseq->flag |= SELECT;
		recurs_sel_seq(ms->parseq);

		MEM_freeN(ms);

	}

	BKE_sequencer_update_muting(ed);
	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_meta_toggle(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Toggle Meta Strip";
	ot->idname = "SEQUENCER_OT_meta_toggle";
	ot->description = "Toggle a metastrip (to edit enclosed strips)";

	/* api callbacks */
	ot->exec = sequencer_meta_toggle_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


/* separate_meta_make operator */
static int sequencer_meta_make_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	Sequence *seq, *seqm, *next, *last_seq = BKE_sequencer_active_get(scene);
	int channel_max = 1;

	if (BKE_sequence_base_isolated_sel_check(ed->seqbasep) == false) {
		BKE_report(op->reports, RPT_ERROR, "Please select all related strips");
		return OPERATOR_CANCELLED;
	}

	/* remove all selected from main list, and put in meta */

	seqm = BKE_sequence_alloc(ed->seqbasep, 1, 1); /* channel number set later */
	strcpy(seqm->name + 2, "MetaStrip");
	seqm->type = SEQ_TYPE_META;
	seqm->flag = SELECT;

	seq = ed->seqbasep->first;
	while (seq) {
		next = seq->next;
		if (seq != seqm && (seq->flag & SELECT)) {
			BKE_sequence_invalidate_cache(scene, seq);
			channel_max = max_ii(seq->machine, channel_max);
			BLI_remlink(ed->seqbasep, seq);
			BLI_addtail(&seqm->seqbase, seq);
		}
		seq = next;
	}
	seqm->machine = last_seq ? last_seq->machine : channel_max;
	BKE_sequence_calc(scene, seqm);

	seqm->strip = MEM_callocN(sizeof(Strip), "metastrip");
	seqm->strip->us = 1;

	BKE_sequencer_active_set(scene, seqm);

	if (BKE_sequence_test_overlap(ed->seqbasep, seqm)) {
		BKE_sequence_base_shuffle(ed->seqbasep, seqm, scene);
	}

	BKE_sequencer_update_muting(ed);

	BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seqm);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_meta_make(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Make Meta Strip";
	ot->idname = "SEQUENCER_OT_meta_make";
	ot->description = "Group selected strips into a metastrip";

	/* api callbacks */
	ot->exec = sequencer_meta_make_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


static int seq_depends_on_meta(Sequence *seq, Sequence *seqm)
{
	if (seq == seqm) {
		return 1;
	}
	else if (seq->seq1 && seq_depends_on_meta(seq->seq1, seqm)) {
		return 1;
	}
	else if (seq->seq2 && seq_depends_on_meta(seq->seq2, seqm)) {
		return 1;
	}
	else if (seq->seq3 && seq_depends_on_meta(seq->seq3, seqm)) {
		return 1;
	}
	else {
		return 0;
	}
}

/* separate_meta_make operator */
static int sequencer_meta_separate_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	Sequence *seq, *last_seq = BKE_sequencer_active_get(scene); /* last_seq checks (ed == NULL) */

	if (last_seq == NULL || last_seq->type != SEQ_TYPE_META) {
		return OPERATOR_CANCELLED;
	}

	for (seq = last_seq->seqbase.first; seq != NULL; seq = seq->next) {
		BKE_sequence_invalidate_cache(scene, seq);
	}

	BLI_movelisttolist(ed->seqbasep, &last_seq->seqbase);

	BLI_listbase_clear(&last_seq->seqbase);

	BLI_remlink(ed->seqbasep, last_seq);
	BKE_sequence_free(scene, last_seq);

	/* empty meta strip, delete all effects depending on it */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->type & SEQ_TYPE_EFFECT) && seq_depends_on_meta(seq, last_seq)) {
			seq->flag |= SEQ_FLAG_DELETE;
		}
	}

	recurs_del_seq_flag(scene, ed->seqbasep, SEQ_FLAG_DELETE, 0);

	/* test for effects and overlap
	 * don't use SEQP_BEGIN since that would be recursive */
	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if (seq->flag & SELECT) {
			seq->flag &= ~SEQ_OVERLAP;
			if (BKE_sequence_test_overlap(ed->seqbasep, seq)) {
				BKE_sequence_base_shuffle(ed->seqbasep, seq, scene);
			}
		}
	}

	BKE_sequencer_sort(scene);
	BKE_sequencer_update_muting(ed);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_meta_separate(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "UnMeta Strip";
	ot->idname = "SEQUENCER_OT_meta_separate";
	ot->description = "Put the contents of a metastrip back in the sequencer";

	/* api callbacks */
	ot->exec = sequencer_meta_separate_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* view_all operator */
static int sequencer_view_all_exec(bContext *C, wmOperator *op)
{
	ARegion *ar = CTX_wm_region(C);
	View2D *v2d = UI_view2d_fromcontext(C);
	const int smooth_viewtx = WM_operator_smooth_viewtx_get(op);

	UI_view2d_smooth_view(C, ar, &v2d->tot, smooth_viewtx);
	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_view_all(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "View All";
	ot->idname = "SEQUENCER_OT_view_all";
	ot->description = "View all the strips in the sequencer";

	/* api callbacks */
	ot->exec = sequencer_view_all_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER;
}

static int sequencer_view_frame_exec(bContext *C, wmOperator *op)
{
	const int smooth_viewtx = WM_operator_smooth_viewtx_get(op);
	ANIM_center_frame(C, smooth_viewtx);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_view_frame(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "View Frame";
	ot->idname = "SEQUENCER_OT_view_frame";
	ot->description = "Reset viewable area to show range around current frame";

	/* api callbacks */
	ot->exec = sequencer_view_frame_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* view_all operator */
static int sequencer_view_all_preview_exec(bContext *C, wmOperator *UNUSED(op))
{
	bScreen *sc = CTX_wm_screen(C);
	ScrArea *area = CTX_wm_area(C);
#if 0
	ARegion *ar = CTX_wm_region(C);
	SpaceSeq *sseq = area->spacedata.first;
	Scene *scene = CTX_data_scene(C);
#endif
	View2D *v2d = UI_view2d_fromcontext(C);

	v2d->cur = v2d->tot;
	UI_view2d_curRect_validate(v2d);
	UI_view2d_sync(sc, area, v2d, V2D_LOCK_COPY);

#if 0
	/* Like zooming on an image view */
	float zoomX, zoomY;
	int width, height, imgwidth, imgheight;

	width = ar->winx;
	height = ar->winy;

	seq_reset_imageofs(sseq);

	imgwidth = (scene->r.size * scene->r.xsch) / 100;
	imgheight = (scene->r.size * scene->r.ysch) / 100;

	/* Apply aspect, dosnt need to be that accurate */
	imgwidth = (int)(imgwidth * (scene->r.xasp / scene->r.yasp));

	if (((imgwidth >= width) || (imgheight >= height)) &&
	    ((width > 0) && (height > 0)))
	{
		/* Find the zoom value that will fit the image in the image space */
		zoomX = ((float)width) / ((float)imgwidth);
		zoomY = ((float)height) / ((float)imgheight);
		sseq->zoom = (zoomX < zoomY) ? zoomX : zoomY;

		sseq->zoom = 1.0f / power_of_2(1 / min_ff(zoomX, zoomY));
	}
	else {
		sseq->zoom = 1.0f;
	}
#endif

	ED_area_tag_redraw(CTX_wm_area(C));
	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_view_all_preview(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "View All";
	ot->idname = "SEQUENCER_OT_view_all_preview";
	ot->description = "Zoom preview to fit in the area";

	/* api callbacks */
	ot->exec = sequencer_view_all_preview_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER;
}


static int sequencer_view_zoom_ratio_exec(bContext *C, wmOperator *op)
{
	RenderData *rd = &CTX_data_scene(C)->r;
	View2D *v2d = UI_view2d_fromcontext(C);

	float ratio = RNA_float_get(op->ptr, "ratio");

	float winx = (int)(rd->size * rd->xsch) / 100;
	float winy = (int)(rd->size * rd->ysch) / 100;

	float facx = BLI_rcti_size_x(&v2d->mask) / winx;
	float facy = BLI_rcti_size_y(&v2d->mask) / winy;

	BLI_rctf_resize(&v2d->cur, ceilf(winx * facx / ratio + 0.5f), ceilf(winy * facy / ratio + 0.5f));

	ED_region_tag_redraw(CTX_wm_region(C));

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_view_zoom_ratio(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Sequencer View Zoom Ratio";
	ot->idname = "SEQUENCER_OT_view_zoom_ratio";
	ot->description = "Change zoom ratio of sequencer preview";

	/* api callbacks */
	ot->exec = sequencer_view_zoom_ratio_exec;
	ot->poll = ED_operator_sequencer_active;

	/* properties */
	RNA_def_float(ot->srna, "ratio", 1.0f, -FLT_MAX, FLT_MAX,
	              "Ratio", "Zoom ratio, 1.0 is 1:1, higher is zoomed in, lower is zoomed out", -FLT_MAX, FLT_MAX);
}


#if 0
static const EnumPropertyItem view_type_items[] = {
	{SEQ_VIEW_SEQUENCE, "SEQUENCER", ICON_SEQ_SEQUENCER, "Sequencer", ""},
	{SEQ_VIEW_PREVIEW,  "PREVIEW", ICON_SEQ_PREVIEW, "Image Preview", ""},
	{SEQ_VIEW_SEQUENCE_PREVIEW,  "SEQUENCER_PREVIEW", ICON_SEQ_SEQUENCER, "Sequencer and Image Preview", ""},
	{0, NULL, 0, NULL, NULL},
};
#endif

/* view_all operator */
static int sequencer_view_toggle_exec(bContext *C, wmOperator *UNUSED(op))
{
	SpaceSeq *sseq = (SpaceSeq *)CTX_wm_space_data(C);

	sseq->view++;
	if (sseq->view > SEQ_VIEW_SEQUENCE_PREVIEW) {
		sseq->view = SEQ_VIEW_SEQUENCE;
	}

	ED_area_tag_refresh(CTX_wm_area(C));

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_view_toggle(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "View Toggle";
	ot->idname = "SEQUENCER_OT_view_toggle";
	ot->description = "Toggle between sequencer views (sequence, preview, both)";

	/* api callbacks */
	ot->exec = sequencer_view_toggle_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER;
}


/* view_selected operator */
static int sequencer_view_selected_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	View2D *v2d = UI_view2d_fromcontext(C);
	ARegion *ar = CTX_wm_region(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *last_seq = BKE_sequencer_active_get(scene);
	Sequence *seq;
	rctf cur_new = v2d->cur;

	int xmin =  MAXFRAME * 2;
	int xmax = -MAXFRAME * 2;
	int ymin =  MAXSEQ + 1;
	int ymax = 0;
	int orig_height;
	int ymid;
	int ymargin = 1;
	int xmargin = FPS;

	if (ed == NULL) {
		return OPERATOR_CANCELLED;
	}

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq->flag & SELECT) || (seq == last_seq)) {
			xmin = min_ii(xmin, seq->startdisp);
			xmax = max_ii(xmax, seq->enddisp);

			ymin = min_ii(ymin, seq->machine);
			ymax = max_ii(ymax, seq->machine);
		}
	}

	if (ymax != 0) {
		const int smooth_viewtx = WM_operator_smooth_viewtx_get(op);

		xmax += xmargin;
		xmin -= xmargin;
		ymax += ymargin;
		ymin -= ymargin;

		orig_height = BLI_rctf_size_y(&cur_new);

		cur_new.xmin = xmin;
		cur_new.xmax = xmax;

		cur_new.ymin = ymin;
		cur_new.ymax = ymax;

		/* only zoom out vertically */
		if (orig_height > BLI_rctf_size_y(&cur_new)) {
			ymid = BLI_rctf_cent_y(&cur_new);

			cur_new.ymin = ymid - (orig_height / 2);
			cur_new.ymax = ymid + (orig_height / 2);
		}

		UI_view2d_smooth_view(C, ar, &cur_new, smooth_viewtx);

		return OPERATOR_FINISHED;
	}
	else {
		return OPERATOR_CANCELLED;
	}

}

void SEQUENCER_OT_view_selected(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "View Selected";
	ot->idname = "SEQUENCER_OT_view_selected";
	ot->description = "Zoom the sequencer on the selected strips";

	/* api callbacks */
	ot->exec = sequencer_view_selected_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER;
}

static bool strip_jump_internal(Scene *scene,
                                const short side,
                                const bool do_skip_mute, const bool do_center)
{
	bool changed = false;
	int cfra = CFRA;
	int nfra = BKE_sequencer_find_next_prev_edit(scene, cfra, side, do_skip_mute, do_center, false);

	if (nfra != cfra) {
		CFRA = nfra;
		changed = true;
	}

	return changed;
}

static bool sequencer_strip_jump_poll(bContext *C)
{
	/* prevent changes during render */
	if (G.is_rendering) {
		return 0;
	}

	return sequencer_edit_poll(C);
}

/* jump frame to edit point operator */
static int sequencer_strip_jump_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	const bool next = RNA_boolean_get(op->ptr, "next");
	const bool center = RNA_boolean_get(op->ptr, "center");

	/* currently do_skip_mute is always true */
	if (!strip_jump_internal(scene, next ? SEQ_SIDE_RIGHT : SEQ_SIDE_LEFT, true, center)) {
		return OPERATOR_CANCELLED;
	}

	WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_strip_jump(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Jump to Strip";
	ot->idname = "SEQUENCER_OT_strip_jump";
	ot->description = "Move frame to previous edit point";

	/* api callbacks */
	ot->exec = sequencer_strip_jump_exec;
	ot->poll = sequencer_strip_jump_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "next", true, "Next Strip", "");
	RNA_def_boolean(ot->srna, "center", true, "Use strip center", "");
}

static void swap_sequence(Scene *scene, Sequence *seqa, Sequence *seqb)
{
	int gap = seqb->startdisp - seqa->enddisp;
	int seq_a_start;
	int seq_b_start;

	seq_b_start = (seqb->start - seqb->startdisp) + seqa->startdisp;
	BKE_sequence_translate(scene, seqb, seq_b_start - seqb->start);
	BKE_sequence_calc(scene, seqb);

	seq_a_start = (seqa->start - seqa->startdisp) + seqb->enddisp + gap;
	BKE_sequence_translate(scene, seqa, seq_a_start - seqa->start);
	BKE_sequence_calc(scene, seqa);
}

#if 0
static Sequence *sequence_find_parent(Scene *scene, Sequence *child)
{
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *parent = NULL;
	Sequence *seq;

	if (ed == NULL) return NULL;

	for (seq = ed->seqbasep->first; seq; seq = seq->next) {
		if ((seq != child) && seq_is_parent(seq, child)) {
			parent = seq;
			break;
		}
	}

	return parent;
}
#endif

static int sequencer_swap_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *active_seq = BKE_sequencer_active_get(scene);
	Sequence *seq, *iseq;
	int side = RNA_enum_get(op->ptr, "side");

	if (active_seq == NULL) {
		return OPERATOR_CANCELLED;
	}

	seq = find_next_prev_sequence(scene, active_seq, side, -1);

	if (seq) {

		/* disallow effect strips */
		if (BKE_sequence_effect_get_num_inputs(seq->type) >= 1 && (seq->effectdata || seq->seq1 || seq->seq2 || seq->seq3)) {
			return OPERATOR_CANCELLED;
		}
		if ((BKE_sequence_effect_get_num_inputs(active_seq->type) >= 1) && (active_seq->effectdata || active_seq->seq1 || active_seq->seq2 || active_seq->seq3)) {
			return OPERATOR_CANCELLED;
		}

		switch (side) {
			case SEQ_SIDE_LEFT:
				swap_sequence(scene, seq, active_seq);
				break;
			case SEQ_SIDE_RIGHT:
				swap_sequence(scene, active_seq, seq);
				break;
		}

		// XXX - should be a generic function
		for (iseq = scene->ed->seqbasep->first; iseq; iseq = iseq->next) {
			if ((iseq->type & SEQ_TYPE_EFFECT) && (seq_is_parent(iseq, active_seq) || seq_is_parent(iseq, seq))) {
				BKE_sequence_calc(scene, iseq);
			}
		}

		/* do this in a new loop since both effects need to be calculated first */
		for (iseq = scene->ed->seqbasep->first; iseq; iseq = iseq->next) {
			if ((iseq->type & SEQ_TYPE_EFFECT) && (seq_is_parent(iseq, active_seq) || seq_is_parent(iseq, seq))) {
				/* this may now overlap */
				if (BKE_sequence_test_overlap(ed->seqbasep, iseq) ) {
					BKE_sequence_base_shuffle(ed->seqbasep, iseq, scene);
				}
			}
		}



		BKE_sequencer_sort(scene);

		WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

		return OPERATOR_FINISHED;
	}

	return OPERATOR_CANCELLED;
}

void SEQUENCER_OT_swap(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Swap Strip";
	ot->idname = "SEQUENCER_OT_swap";
	ot->description = "Swap active strip with strip to the right or left";

	/* api callbacks */
	ot->exec = sequencer_swap_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
	RNA_def_enum(ot->srna, "side", prop_side_lr_types, SEQ_SIDE_RIGHT, "Side", "Side of the strip to swap");
}

static int sequencer_rendersize_exec(bContext *C, wmOperator *UNUSED(op))
{
	int retval = OPERATOR_CANCELLED;
	Scene *scene = CTX_data_scene(C);
	Sequence *active_seq = BKE_sequencer_active_get(scene);
	StripElem *se = NULL;

	if (active_seq == NULL) {
		return OPERATOR_CANCELLED;
	}


	if (active_seq->strip) {
		switch (active_seq->type) {
			case SEQ_TYPE_IMAGE:
				se = BKE_sequencer_give_stripelem(active_seq, scene->r.cfra);
				break;
			case SEQ_TYPE_MOVIE:
				se = active_seq->strip->stripdata;
				break;
			case SEQ_TYPE_SCENE:
			case SEQ_TYPE_META:
			case SEQ_TYPE_SOUND_RAM:
			case SEQ_TYPE_SOUND_HD:
			default:
				break;
		}
	}

	if (se) {
		// prevent setting the render size if sequence values aren't initialized
		if ((se->orig_width > 0) && (se->orig_height > 0)) {
			scene->r.xsch = se->orig_width;
			scene->r.ysch = se->orig_height;
			WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
			retval = OPERATOR_FINISHED;
		}
	}

	return retval;
}

void SEQUENCER_OT_rendersize(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Set Render Size";
	ot->idname = "SEQUENCER_OT_rendersize";
	ot->description = "Set render size and aspect from active sequence";

	/* api callbacks */
	ot->exec = sequencer_rendersize_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
}

static void seq_copy_del_sound(Scene *scene, Sequence *seq)
{
	if (seq->type == SEQ_TYPE_META) {
		Sequence *iseq;
		for (iseq = seq->seqbase.first; iseq; iseq = iseq->next) {
			seq_copy_del_sound(scene, iseq);
		}
	}
	else if (seq->scene_sound) {
		BKE_sound_remove_scene_sound(scene, seq->scene_sound);
		seq->scene_sound = NULL;
	}
}

static int sequencer_copy_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);

	ListBase nseqbase = {NULL, NULL};

	BKE_sequencer_free_clipboard();

	if (BKE_sequence_base_isolated_sel_check(ed->seqbasep) == false) {
		BKE_report(op->reports, RPT_ERROR, "Please select all related strips");
		return OPERATOR_CANCELLED;
	}

	BKE_sequence_base_dupli_recursive(scene, scene, &nseqbase, ed->seqbasep, SEQ_DUPE_UNIQUE_NAME, LIB_ID_CREATE_NO_USER_REFCOUNT);

	/* To make sure the copied strips have unique names between each other add
	 * them temporarily to the end of the original seqbase. (bug 25932)
	 */
	if (nseqbase.first) {
		Sequence *seq, *first_seq = nseqbase.first;
		BLI_movelisttolist(ed->seqbasep, &nseqbase);

		for (seq = first_seq; seq; seq = seq->next) {
			BKE_sequencer_recursive_apply(seq, apply_unique_name_cb, scene);
		}

		seqbase_clipboard.first = first_seq;
		seqbase_clipboard.last = ed->seqbasep->last;

		if (first_seq->prev) {
			first_seq->prev->next = NULL;
			ed->seqbasep->last = first_seq->prev;
			first_seq->prev = NULL;
		}
	}

	seqbase_clipboard_frame = scene->r.cfra;

	/* Need to remove anything that references the current scene */
	for (Sequence *seq = seqbase_clipboard.first; seq; seq = seq->next) {
		seq_copy_del_sound(scene, seq);
	}

	/* Replace datablock pointers with copies, to keep things working in case
	 * datablocks get deleted or another .blend file is openeded. */
	BKE_sequencer_base_clipboard_pointers_store(bmain, &seqbase_clipboard);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_copy(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Copy";
	ot->idname = "SEQUENCER_OT_copy";

	/* api callbacks */
	ot->exec = sequencer_copy_exec;
	ot->poll = sequencer_edit_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER;

	/* properties */
}

static int sequencer_paste_exec(bContext *C, wmOperator *UNUSED(op))
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, true); /* create if needed */
	ListBase nseqbase = {NULL, NULL};
	int ofs;
	Sequence *iseq, *iseq_first;

	ED_sequencer_deselect_all(scene);
	ofs = scene->r.cfra - seqbase_clipboard_frame;

	/* Copy strips, temporarily restoring pointers to actual datablocks. This
	 * must happen on the clipboard itself, so that copying does user counting
	 * on the actual datablocks. */
	BKE_sequencer_base_clipboard_pointers_restore(&seqbase_clipboard, bmain);
	BKE_sequence_base_dupli_recursive(scene, scene, &nseqbase, &seqbase_clipboard, SEQ_DUPE_UNIQUE_NAME, 0);
	BKE_sequencer_base_clipboard_pointers_store(bmain, &seqbase_clipboard);

	/* transform pasted strips before adding */
	if (ofs) {
		for (iseq = nseqbase.first; iseq; iseq = iseq->next) {
			BKE_sequence_translate(scene, iseq, ofs);
		}
	}

	for (iseq = nseqbase.first; iseq; iseq = iseq->next) {
		BKE_sequence_sound_init(scene, iseq);
	}

	iseq_first = nseqbase.first;

	BLI_movelisttolist(ed->seqbasep, &nseqbase);

	/* make sure the pasted strips have unique names between them */
	for (iseq = iseq_first; iseq; iseq = iseq->next) {
		BKE_sequencer_recursive_apply(iseq, apply_unique_name_cb, scene);
	}

	/* ensure pasted strips don't overlap */
	for (iseq = iseq_first; iseq; iseq = iseq->next) {
		if (BKE_sequence_test_overlap(ed->seqbasep, iseq)) {
			BKE_sequence_base_shuffle(ed->seqbasep, iseq, scene);
		}
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_paste(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Paste";
	ot->idname = "SEQUENCER_OT_paste";

	/* api callbacks */
	ot->exec = sequencer_paste_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
}

static int sequencer_swap_data_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Sequence *seq_act;
	Sequence *seq_other;
	const char *error_msg;

	if (BKE_sequencer_active_get_pair(scene, &seq_act, &seq_other) == 0) {
		BKE_report(op->reports, RPT_ERROR, "Please select two strips");
		return OPERATOR_CANCELLED;
	}

	if (BKE_sequence_swap(seq_act, seq_other, &error_msg) == 0) {
		BKE_report(op->reports, RPT_ERROR, error_msg);
		return OPERATOR_CANCELLED;
	}

	if (seq_act->scene_sound) {
		BKE_sound_remove_scene_sound(scene, seq_act->scene_sound);
	}

	if (seq_other->scene_sound) {
		BKE_sound_remove_scene_sound(scene, seq_other->scene_sound);
	}

	seq_act->scene_sound = NULL;
	seq_other->scene_sound = NULL;

	BKE_sequence_calc(scene, seq_act);
	BKE_sequence_calc(scene, seq_other);

	if (seq_act->sound) {
		BKE_sound_add_scene_sound_defaults(scene, seq_act);
	}
	if (seq_other->sound) {
		BKE_sound_add_scene_sound_defaults(scene, seq_other);
	}

	BKE_sequence_invalidate_cache(scene, seq_act);
	BKE_sequence_invalidate_cache(scene, seq_other);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_swap_data(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Sequencer Swap Data";
	ot->idname = "SEQUENCER_OT_swap_data";
	ot->description = "Swap 2 sequencer strips";

	/* api callbacks */
	ot->exec = sequencer_swap_data_exec;
	ot->poll = ED_operator_sequencer_active;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
}

/* box select operator */
static int view_ghost_border_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	View2D *v2d = UI_view2d_fromcontext(C);

	rctf rect;

	/* convert coordinates of rect to 'tot' rect coordinates */
	WM_operator_properties_border_to_rctf(op, &rect);
	UI_view2d_region_to_view_rctf(v2d, &rect, &rect);

	rect.xmin /=  fabsf(BLI_rctf_size_x(&v2d->tot));
	rect.ymin /=  fabsf(BLI_rctf_size_y(&v2d->tot));

	rect.xmax /=  fabsf(BLI_rctf_size_x(&v2d->tot));
	rect.ymax /=  fabsf(BLI_rctf_size_y(&v2d->tot));

	rect.xmin += 0.5f;
	rect.xmax += 0.5f;
	rect.ymin += 0.5f;
	rect.ymax += 0.5f;

	CLAMP(rect.xmin, 0.0f, 1.0f);
	CLAMP(rect.ymin, 0.0f, 1.0f);
	CLAMP(rect.xmax, 0.0f, 1.0f);
	CLAMP(rect.ymax, 0.0f, 1.0f);

	scene->ed->over_border = rect;

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

/* ****** Box Select ****** */
void SEQUENCER_OT_view_ghost_border(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Border Offset View";
	ot->idname = "SEQUENCER_OT_view_ghost_border";
	ot->description = "Set the boundaries of the border used for offset-view";

	/* api callbacks */
	ot->invoke = WM_gesture_box_invoke;
	ot->exec = view_ghost_border_exec;
	ot->modal = WM_gesture_box_modal;
	ot->poll = sequencer_view_preview_poll;
	ot->cancel = WM_gesture_box_cancel;

	/* flags */
	ot->flag = 0;

	/* rna */
	WM_operator_properties_gesture_box(ot);
}

/* rebuild_proxy operator */

static int sequencer_rebuild_proxy_invoke(bContext *C, wmOperator *UNUSED(op),
                                          const wmEvent *UNUSED(event))
{
	seq_proxy_build_job(C);

	return OPERATOR_FINISHED;
}

static int sequencer_rebuild_proxy_exec(bContext *C, wmOperator *UNUSED(op))
{
	Main *bmain = CTX_data_main(C);
	struct Depsgraph *depsgraph = CTX_data_depsgraph(C);
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	GSet *file_list;

	if (ed == NULL) {
		return OPERATOR_CANCELLED;
	}

	file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");

	SEQP_BEGIN(ed, seq)
	{
		if ((seq->flag & SELECT)) {
			ListBase queue = {NULL, NULL};
			LinkData *link;
			short stop = 0, do_update;
			float progress;

			BKE_sequencer_proxy_rebuild_context(bmain, depsgraph, scene, seq, file_list, &queue);

			for (link = queue.first; link; link = link->next) {
				struct SeqIndexBuildContext *context = link->data;
				BKE_sequencer_proxy_rebuild(context, &stop, &do_update, &progress);
				BKE_sequencer_proxy_rebuild_finish(context, 0);
			}
			BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);
		}
	} SEQ_END;

	BLI_gset_free(file_list, MEM_freeN);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_rebuild_proxy(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Rebuild Proxy and Timecode Indices";
	ot->idname = "SEQUENCER_OT_rebuild_proxy";
	ot->description = "Rebuild all selected proxies and timecode indices using the job system";

	/* api callbacks */
	ot->invoke = sequencer_rebuild_proxy_invoke;
	ot->exec = sequencer_rebuild_proxy_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER;
}

static int sequencer_enable_proxies_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	return WM_operator_props_dialog_popup(C, op, 200, 100);
}

static int sequencer_enable_proxies_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq;
	bool proxy_25 = RNA_boolean_get(op->ptr, "proxy_25");
	bool proxy_50 = RNA_boolean_get(op->ptr, "proxy_50");
	bool proxy_75 = RNA_boolean_get(op->ptr, "proxy_75");
	bool proxy_100 = RNA_boolean_get(op->ptr, "proxy_100");
	bool overwrite = RNA_boolean_get(op->ptr, "overwrite");
	bool turnon = true;

	if (ed == NULL || !(proxy_25 || proxy_50 || proxy_75 || proxy_100)) {
		turnon = false;
	}

	SEQP_BEGIN(ed, seq)
	{
		if ((seq->flag & SELECT)) {
			if (ELEM(seq->type, SEQ_TYPE_MOVIE, SEQ_TYPE_IMAGE, SEQ_TYPE_META, SEQ_TYPE_SCENE, SEQ_TYPE_MULTICAM)) {
				BKE_sequencer_proxy_set(seq, turnon);
				if (seq->strip->proxy == NULL) {
					continue;
				}

				if (proxy_25) {
					seq->strip->proxy->build_size_flags |= SEQ_PROXY_IMAGE_SIZE_25;
				}
				else {
					seq->strip->proxy->build_size_flags &= ~SEQ_PROXY_IMAGE_SIZE_25;
				}

				if (proxy_50) {
					seq->strip->proxy->build_size_flags |= SEQ_PROXY_IMAGE_SIZE_50;
				}
				else {
					seq->strip->proxy->build_size_flags &= ~SEQ_PROXY_IMAGE_SIZE_50;
				}

				if (proxy_75) {
					seq->strip->proxy->build_size_flags |= SEQ_PROXY_IMAGE_SIZE_75;
				}
				else {
					seq->strip->proxy->build_size_flags &= ~SEQ_PROXY_IMAGE_SIZE_75;
				}

				if (proxy_100) {
					seq->strip->proxy->build_size_flags |= SEQ_PROXY_IMAGE_SIZE_100;
				}
				else {
					seq->strip->proxy->build_size_flags &= ~SEQ_PROXY_IMAGE_SIZE_100;
				}

				if (!overwrite) {
					seq->strip->proxy->build_flags |= SEQ_PROXY_SKIP_EXISTING;
				}
				else {
					seq->strip->proxy->build_flags &= ~SEQ_PROXY_SKIP_EXISTING;
				}
			}
		}
	} SEQ_END;

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_enable_proxies(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Set Selected Strip Proxies";
	ot->idname = "SEQUENCER_OT_enable_proxies";
	ot->description = "Enable selected proxies on all selected Movie, Image and Meta strips";

	/* api callbacks */
	ot->invoke = sequencer_enable_proxies_invoke;
	ot->exec = sequencer_enable_proxies_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER;

	RNA_def_boolean(ot->srna, "proxy_25", false, "25%", "");
	RNA_def_boolean(ot->srna, "proxy_50", false, "50%", "");
	RNA_def_boolean(ot->srna, "proxy_75", false, "75%", "");
	RNA_def_boolean(ot->srna, "proxy_100", false, "100%", "");
	RNA_def_boolean(ot->srna, "overwrite", false, "Overwrite", "");
}

/* change ops */

static const EnumPropertyItem prop_change_effect_input_types[] = {
	{0, "A_B", 0, "A -> B", ""},
	{1, "B_C", 0, "B -> C", ""},
	{2, "A_C", 0, "A -> C", ""},
	{0, NULL, 0, NULL, NULL},
};

static int sequencer_change_effect_input_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq = BKE_sequencer_active_get(scene);

	Sequence **seq_1, **seq_2;

	switch (RNA_enum_get(op->ptr, "swap")) {
		case 0:
			seq_1 = &seq->seq1;
			seq_2 = &seq->seq2;
			break;
		case 1:
			seq_1 = &seq->seq2;
			seq_2 = &seq->seq3;
			break;
		default: /* 2 */
			seq_1 = &seq->seq1;
			seq_2 = &seq->seq3;
			break;
	}

	if (*seq_1 == NULL || *seq_2 == NULL) {
		BKE_report(op->reports, RPT_ERROR, "One of the effect inputs is unset, cannot swap");
		return OPERATOR_CANCELLED;
	}
	else {
		SWAP(Sequence *, *seq_1, *seq_2);
	}

	BKE_sequencer_update_changed_seq_and_deps(scene, seq, 0, 1);

	/* important else we don't get the imbuf cache flushed */
	BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_change_effect_input(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Change Effect Input";
	ot->idname = "SEQUENCER_OT_change_effect_input";

	/* api callbacks */
	ot->exec = sequencer_change_effect_input_exec;
	ot->poll = sequencer_effect_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	ot->prop = RNA_def_enum(ot->srna, "swap", prop_change_effect_input_types, 0, "Swap", "The effect inputs to swap");
}

static int sequencer_change_effect_type_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq = BKE_sequencer_active_get(scene);
	const int new_type = RNA_enum_get(op->ptr, "type");

	/* free previous effect and init new effect */
	struct SeqEffectHandle sh;

	if ((seq->type & SEQ_TYPE_EFFECT) == 0) {
		return OPERATOR_CANCELLED;
	}

	/* can someone explain the logic behind only allowing to increase this,
	 * copied from 2.4x - campbell */
	if (BKE_sequence_effect_get_num_inputs(seq->type) <
	    BKE_sequence_effect_get_num_inputs(new_type))
	{
		BKE_report(op->reports, RPT_ERROR, "New effect needs more input strips");
		return OPERATOR_CANCELLED;
	}
	else {
		sh = BKE_sequence_get_effect(seq);
		sh.free(seq, true);

		seq->type = new_type;

		sh = BKE_sequence_get_effect(seq);
		sh.init(seq);
	}

	/* update */
	BKE_sequencer_update_changed_seq_and_deps(scene, seq, 0, 1);

	/* important else we don't get the imbuf cache flushed */
	BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

void SEQUENCER_OT_change_effect_type(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Change Effect Type";
	ot->idname = "SEQUENCER_OT_change_effect_type";

	/* api callbacks */
	ot->exec = sequencer_change_effect_type_exec;
	ot->poll = sequencer_effect_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	ot->prop = RNA_def_enum(ot->srna, "type", sequencer_prop_effect_types, SEQ_TYPE_CROSS, "Type", "Sequencer effect type");
}

static int sequencer_change_path_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	Sequence *seq = BKE_sequencer_active_get(scene);
	const bool is_relative_path = RNA_boolean_get(op->ptr, "relative_path");
	const bool use_placeholders = RNA_boolean_get(op->ptr, "use_placeholders");
	int minframe, numdigits;

	if (seq->type == SEQ_TYPE_IMAGE) {
		char directory[FILE_MAX];
		int len;
		StripElem *se;

		/* need to find min/max frame for placeholders */
		if (use_placeholders) {
			len = sequencer_image_seq_get_minmax_frame(op, seq->sfra, &minframe, &numdigits);
		}
		else {
			len = RNA_property_collection_length(op->ptr, RNA_struct_find_property(op->ptr, "files"));
		}
		if (len == 0) {
			return OPERATOR_CANCELLED;
		}

		RNA_string_get(op->ptr, "directory", directory);
		if (is_relative_path) {
			/* TODO, shouldn't this already be relative from the filesel?
			 * (as the 'filepath' is) for now just make relative here,
			 * but look into changing after 2.60 - campbell */
			BLI_path_rel(directory, BKE_main_blendfile_path(bmain));
		}
		BLI_strncpy(seq->strip->dir, directory, sizeof(seq->strip->dir));

		if (seq->strip->stripdata) {
			MEM_freeN(seq->strip->stripdata);
		}
		seq->strip->stripdata = se = MEM_callocN(len * sizeof(StripElem), "stripelem");

		if (use_placeholders) {
			sequencer_image_seq_reserve_frames(op, se, len, minframe, numdigits);
		}
		else {
			RNA_BEGIN (op->ptr, itemptr, "files")
			{
				char *filename = RNA_string_get_alloc(&itemptr, "name", NULL, 0);
				BLI_strncpy(se->name, filename, sizeof(se->name));
				MEM_freeN(filename);
				se++;
			}
			RNA_END;
		}

		/* reset these else we wont see all the images */
		seq->anim_startofs = seq->anim_endofs = 0;

		/* correct start/end frames so we don't move
		 * important not to set seq->len = len; allow the function to handle it */
		BKE_sequence_reload_new_file(scene, seq, true);

		BKE_sequence_calc(scene, seq);

		/* important else we don't get the imbuf cache flushed */
		BKE_sequencer_free_imbuf(scene, &ed->seqbase, false);
	}
	else if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD)) {
		bSound *sound = seq->sound;
		if (sound == NULL) {
			return OPERATOR_CANCELLED;
		}
		char filepath[FILE_MAX];
		RNA_string_get(op->ptr, "filepath", filepath);
		BLI_strncpy(sound->name, filepath, sizeof(sound->name));
		BKE_sound_load(bmain, sound);
	}
	else {
		/* lame, set rna filepath */
		PointerRNA seq_ptr;
		PropertyRNA *prop;
		char filepath[FILE_MAX];

		RNA_pointer_create(&scene->id, &RNA_Sequence, seq, &seq_ptr);

		RNA_string_get(op->ptr, "filepath", filepath);
		prop = RNA_struct_find_property(&seq_ptr, "filepath");
		RNA_property_string_set(&seq_ptr, prop, filepath);
		RNA_property_update(C, &seq_ptr, prop);
	}

	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);

	return OPERATOR_FINISHED;
}

static int sequencer_change_path_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	Scene *scene = CTX_data_scene(C);
	Sequence *seq = BKE_sequencer_active_get(scene);
	char filepath[FILE_MAX];

	BLI_join_dirfile(filepath, sizeof(filepath), seq->strip->dir, seq->strip->stripdata->name);

	RNA_string_set(op->ptr, "directory", seq->strip->dir);
	RNA_string_set(op->ptr, "filepath",  filepath);

	/* set default display depending on seq type */
	if (seq->type == SEQ_TYPE_IMAGE) {
		RNA_boolean_set(op->ptr, "filter_movie", false);
	}
	else {
		RNA_boolean_set(op->ptr, "filter_image", false);
	}

	WM_event_add_fileselect(C, op);

	return OPERATOR_RUNNING_MODAL;
}

void SEQUENCER_OT_change_path(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Change Data/Files";
	ot->idname = "SEQUENCER_OT_change_path";

	/* api callbacks */
	ot->exec = sequencer_change_path_exec;
	ot->invoke = sequencer_change_path_invoke;
	ot->poll = sequencer_strip_has_path_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	WM_operator_properties_filesel(
	        ot, FILE_TYPE_FOLDER, FILE_SPECIAL, FILE_OPENFILE,
	        WM_FILESEL_DIRECTORY | WM_FILESEL_RELPATH | WM_FILESEL_FILEPATH | WM_FILESEL_FILES,
	        FILE_DEFAULTDISPLAY, FILE_SORT_ALPHA);
	RNA_def_boolean(ot->srna, "use_placeholders", false, "Use Placeholders", "Use placeholders for missing frames of the strip");
}

static int sequencer_export_subtitles_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	Main *bmain = CTX_data_main(C);
	if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
		char filepath[FILE_MAX];

		if (BKE_main_blendfile_path(bmain)[0] == '\0') {
			BLI_strncpy(filepath, "untitled", sizeof(filepath));
		}
		else {
			BLI_strncpy(filepath, BKE_main_blendfile_path(bmain), sizeof(filepath));
		}

		BLI_path_extension_replace(filepath, sizeof(filepath), ".srt");
		RNA_string_set(op->ptr, "filepath", filepath);
	}

	WM_event_add_fileselect(C, op);

	return OPERATOR_RUNNING_MODAL;
}

static int sequencer_export_subtitles_exec(bContext *C, wmOperator *op)
{
	Scene *scene = CTX_data_scene(C);
	Sequence *seq, *seq_next;
	Editing *ed = BKE_sequencer_editing_get(scene, false);
	ListBase text_seq = {0};
	int iter = 0;
	FILE *file;
	char filepath[FILE_MAX];

	if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
		BKE_report(op->reports, RPT_ERROR, "No filename given");
		return OPERATOR_CANCELLED;
	}

	RNA_string_get(op->ptr, "filepath", filepath);
	BLI_path_extension_ensure(filepath, sizeof(filepath), ".srt");

	/* Avoid File write exceptions */
	if (!BLI_exists(filepath)) {
		BLI_make_existing_file(filepath);
		if (!BLI_file_touch(filepath)) {
			BKE_report(op->reports, RPT_ERROR, "Can't create subtitle file");
			return OPERATOR_CANCELLED;
		}
	}
	else if (!BLI_file_is_writable(filepath)) {
		BKE_report(op->reports, RPT_ERROR, "Can't overwrite export file");
		return OPERATOR_CANCELLED;
	}

	SEQ_BEGIN(ed, seq)
	{
		if (seq->type == SEQ_TYPE_TEXT) {
			BLI_addtail(&text_seq, MEM_dupallocN(seq));
		}
	} SEQ_END;

	if (BLI_listbase_is_empty(&text_seq)) {
		BKE_report(op->reports, RPT_ERROR, "No subtitles (text strips) to export");
		return OPERATOR_CANCELLED;
	}

	BLI_listbase_sort(&text_seq, BKE_sequencer_cmp_time_startdisp);

	/* time to open and write! */
	file = BLI_fopen(filepath, "w");

	for (seq = text_seq.first; seq; seq = seq_next) {
		TextVars *data = seq->effectdata;
		char timecode_str_start[32];
		char timecode_str_end[32];

		BLI_timecode_string_from_time(timecode_str_start, sizeof(timecode_str_start),
		                              -2, FRA2TIME(seq->startdisp), FPS, USER_TIMECODE_SUBRIP);
		BLI_timecode_string_from_time(timecode_str_end, sizeof(timecode_str_end),
		                              -2, FRA2TIME(seq->enddisp), FPS, USER_TIMECODE_SUBRIP);

		fprintf(file, "%d\n%s --> %s\n%s\n\n", iter++, timecode_str_start, timecode_str_end, data->text);

		seq_next = seq->next;
		MEM_freeN(seq);
	}

	fclose(file);

	return OPERATOR_FINISHED;
}

static bool sequencer_strip_is_text_poll(bContext *C)
{
	Editing *ed;
	Sequence *seq;
	return (((ed = BKE_sequencer_editing_get(CTX_data_scene(C), false)) != NULL) && ((seq = ed->act_seq) != NULL) && (seq->type == SEQ_TYPE_TEXT));
}

void SEQUENCER_OT_export_subtitles(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Export Subtitles";
	ot->idname = "SEQUENCER_OT_export_subtitles";
	ot->description = "Export .srt file containing text strips";

	/* api callbacks */
	ot->exec = sequencer_export_subtitles_exec;
	ot->invoke = sequencer_export_subtitles_invoke;
	ot->poll = sequencer_strip_is_text_poll;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	WM_operator_properties_filesel(
	        ot,  FILE_TYPE_FOLDER, FILE_BLENDER, FILE_SAVE,
	        WM_FILESEL_FILEPATH, FILE_DEFAULTDISPLAY, FILE_SORT_ALPHA);
}