Move sequencer sources from blenkernel

This is first step of refactoring task T77580.
Next step will be breaking up files into smaller ones.

Reviewed By: sergey, brecht

Differential Revision: https://developer.blender.org/D8492

1 files changed, 0 insertions, 6193 deletions

diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
deleted file mode 100644
index b8ccdec0902..00000000000
--- a/source/blender/blenkernel/intern/sequencer.c
+++ /dev/null
@@ -1,6193 +0,0 @@
-/*
- * 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.
- *
- * - Blender Foundation, 2003-2009
- * - Peter Schlaile <peter [at] schlaile [dot] de> 2005/2006
- */
-
-/** \file
- * \ingroup bke
- */
-
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#include "MEM_guardedalloc.h"
-
-#include "DNA_anim_types.h"
-#include "DNA_mask_types.h"
-#include "DNA_movieclip_types.h"
-#include "DNA_object_types.h"
-#include "DNA_scene_types.h"
-#include "DNA_sequence_types.h"
-#include "DNA_sound_types.h"
-#include "DNA_space_types.h"
-#include "DNA_windowmanager_types.h"
-
-#include "BLI_fileops.h"
-#include "BLI_linklist.h"
-#include "BLI_listbase.h"
-#include "BLI_math.h"
-#include "BLI_path_util.h"
-#include "BLI_session_uuid.h"
-#include "BLI_string.h"
-#include "BLI_string_utf8.h"
-#include "BLI_threads.h"
-#include "BLI_utildefines.h"
-
-#ifdef WIN32
-#  include "BLI_winstuff.h"
-#else
-#  include <unistd.h>
-#endif
-
-#include "BLT_translation.h"
-
-#include "BKE_anim_data.h"
-#include "BKE_animsys.h"
-#include "BKE_fcurve.h"
-#include "BKE_global.h"
-#include "BKE_idprop.h"
-#include "BKE_image.h"
-#include "BKE_layer.h"
-#include "BKE_lib_id.h"
-#include "BKE_main.h"
-#include "BKE_mask.h"
-#include "BKE_movieclip.h"
-#include "BKE_report.h"
-#include "BKE_scene.h"
-#include "BKE_sequencer.h"
-#include "BKE_sequencer_offscreen.h"
-
-#include "DEG_depsgraph.h"
-#include "DEG_depsgraph_query.h"
-
-#include "RNA_access.h"
-
-#include "RE_pipeline.h"
-
-#include <pthread.h>
-
-#include "IMB_colormanagement.h"
-#include "IMB_imbuf.h"
-#include "IMB_imbuf_types.h"
-#include "IMB_metadata.h"
-
-#include "BKE_context.h"
-#include "BKE_sound.h"
-
-#include "RE_engine.h"
-
-#ifdef WITH_AUDASPACE
-#  include <AUD_Special.h>
-#endif
-
-/* mutable state for sequencer */
-typedef struct SeqRenderState {
-  LinkNode *scene_parents;
-} SeqRenderState;
-
-static ImBuf *seq_render_strip_stack(const SeqRenderData *context,
-                                     SeqRenderState *state,
-                                     ListBase *seqbasep,
-                                     float cfra,
-                                     int chanshown);
-static ImBuf *seq_render_preprocess_ibuf(const SeqRenderData *context,
-                                         Sequence *seq,
-                                         ImBuf *ibuf,
-                                         float cfra,
-                                         clock_t begin,
-                                         bool use_preprocess,
-                                         const bool is_proxy_image);
-static ImBuf *seq_render_strip(const SeqRenderData *context,
-                               SeqRenderState *state,
-                               Sequence *seq,
-                               float cfra);
-static void seq_free_animdata(Scene *scene, Sequence *seq);
-static ImBuf *seq_render_mask(const SeqRenderData *context, Mask *mask, float nr, bool make_float);
-static int seq_num_files(Scene *scene, char views_format, const bool is_multiview);
-static void seq_anim_add_suffix(Scene *scene, struct anim *anim, const int view_id);
-
-static ThreadMutex seq_render_mutex = BLI_MUTEX_INITIALIZER;
-
-/* **** XXX ******** */
-#define SELECT 1
-ListBase seqbase_clipboard;
-int seqbase_clipboard_frame;
-
-SequencerDrawView sequencer_view3d_fn = NULL; /* NULL in background mode */
-
-#if 0 /* unused function */
-static void printf_strip(Sequence *seq)
-{
-  fprintf(stderr,
-          "name: '%s', len:%d, start:%d, (startofs:%d, endofs:%d), "
-          "(startstill:%d, endstill:%d), machine:%d, (startdisp:%d, enddisp:%d)\n",
-          seq->name,
-          seq->len,
-          seq->start,
-          seq->startofs,
-          seq->endofs,
-          seq->startstill,
-          seq->endstill,
-          seq->machine,
-          seq->startdisp,
-          seq->enddisp);
-
-  fprintf(stderr,
-          "\tseq_tx_set_final_left: %d %d\n\n",
-          seq_tx_get_final_left(seq, 0),
-          seq_tx_get_final_right(seq, 0));
-}
-#endif
-
-static void sequencer_state_init(SeqRenderState *state)
-{
-  state->scene_parents = NULL;
-}
-
-int BKE_sequencer_base_recursive_apply(ListBase *seqbase,
-                                       int (*apply_fn)(Sequence *seq, void *),
-                                       void *arg)
-{
-  Sequence *iseq;
-  for (iseq = seqbase->first; iseq; iseq = iseq->next) {
-    if (BKE_sequencer_recursive_apply(iseq, apply_fn, arg) == -1) {
-      return -1; /* bail out */
-    }
-  }
-  return 1;
-}
-
-int BKE_sequencer_recursive_apply(Sequence *seq, int (*apply_fn)(Sequence *, void *), void *arg)
-{
-  int ret = apply_fn(seq, arg);
-
-  if (ret == -1) {
-    return -1; /* bail out */
-  }
-
-  if (ret && seq->seqbase.first) {
-    ret = BKE_sequencer_base_recursive_apply(&seq->seqbase, apply_fn, arg);
-  }
-
-  return ret;
-}
-
-/*********************** alloc / free functions *************************/
-
-/* free */
-
-static void free_proxy_seq(Sequence *seq)
-{
-  if (seq->strip && seq->strip->proxy && seq->strip->proxy->anim) {
-    IMB_free_anim(seq->strip->proxy->anim);
-    seq->strip->proxy->anim = NULL;
-  }
-}
-
-static void seq_free_strip(Strip *strip)
-{
-  strip->us--;
-  if (strip->us > 0) {
-    return;
-  }
-  if (strip->us < 0) {
-    printf("error: negative users in strip\n");
-    return;
-  }
-
-  if (strip->stripdata) {
-    MEM_freeN(strip->stripdata);
-  }
-
-  if (strip->proxy) {
-    if (strip->proxy->anim) {
-      IMB_free_anim(strip->proxy->anim);
-    }
-
-    MEM_freeN(strip->proxy);
-  }
-  if (strip->crop) {
-    MEM_freeN(strip->crop);
-  }
-  if (strip->transform) {
-    MEM_freeN(strip->transform);
-  }
-
-  MEM_freeN(strip);
-}
-
-/* only give option to skip cache locally (static func) */
-static void BKE_sequence_free_ex(Scene *scene,
-                                 Sequence *seq,
-                                 const bool do_cache,
-                                 const bool do_id_user,
-                                 const bool do_clean_animdata)
-{
-  if (seq->strip) {
-    seq_free_strip(seq->strip);
-  }
-
-  BKE_sequence_free_anim(seq);
-
-  if (seq->type & SEQ_TYPE_EFFECT) {
-    struct SeqEffectHandle sh = BKE_sequence_get_effect(seq);
-    sh.free(seq, do_id_user);
-  }
-
-  if (seq->sound && do_id_user) {
-    id_us_min(((ID *)seq->sound));
-  }
-
-  if (seq->stereo3d_format) {
-    MEM_freeN(seq->stereo3d_format);
-  }
-
-  /* clipboard has no scene and will never have a sound handle or be active
-   * same goes to sequences copy for proxy rebuild job
-   */
-  if (scene) {
-    Editing *ed = scene->ed;
-
-    if (ed->act_seq == seq) {
-      ed->act_seq = NULL;
-    }
-
-    if (seq->scene_sound && ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SCENE)) {
-      BKE_sound_remove_scene_sound(scene, seq->scene_sound);
-    }
-
-    /* XXX This must not be done in BKE code. */
-    if (do_clean_animdata) {
-      seq_free_animdata(scene, seq);
-    }
-  }
-
-  if (seq->prop) {
-    IDP_FreePropertyContent_ex(seq->prop, do_id_user);
-    MEM_freeN(seq->prop);
-  }
-
-  /* free modifiers */
-  BKE_sequence_modifier_clear(seq);
-
-  /* free cached data used by this strip,
-   * also invalidate cache for all dependent sequences
-   *
-   * be _very_ careful here, invalidating cache loops over the scene sequences and
-   * assumes the listbase is valid for all strips,
-   * this may not be the case if lists are being freed.
-   * this is optional BKE_sequence_invalidate_cache
-   */
-  if (do_cache) {
-    if (scene) {
-      BKE_sequence_invalidate_cache_raw(scene, seq);
-    }
-  }
-
-  MEM_freeN(seq);
-}
-
-void BKE_sequence_free(Scene *scene, Sequence *seq, const bool do_clean_animdata)
-{
-  BKE_sequence_free_ex(scene, seq, true, true, do_clean_animdata);
-}
-
-/* Function to free imbuf and anim data on changes */
-void BKE_sequence_free_anim(Sequence *seq)
-{
-  while (seq->anims.last) {
-    StripAnim *sanim = seq->anims.last;
-
-    if (sanim->anim) {
-      IMB_free_anim(sanim->anim);
-      sanim->anim = NULL;
-    }
-
-    BLI_freelinkN(&seq->anims, sanim);
-  }
-  BLI_listbase_clear(&seq->anims);
-}
-
-/* cache must be freed before calling this function
- * since it leaves the seqbase in an invalid state */
-static void seq_free_sequence_recurse(Scene *scene, Sequence *seq, const bool do_id_user)
-{
-  Sequence *iseq, *iseq_next;
-
-  for (iseq = seq->seqbase.first; iseq; iseq = iseq_next) {
-    iseq_next = iseq->next;
-    seq_free_sequence_recurse(scene, iseq, do_id_user);
-  }
-
-  BKE_sequence_free_ex(scene, seq, false, do_id_user, true);
-}
-
-Editing *BKE_sequencer_editing_get(Scene *scene, bool alloc)
-{
-  if (alloc) {
-    BKE_sequencer_editing_ensure(scene);
-  }
-  return scene->ed;
-}
-
-void BKE_sequencer_free_clipboard(void)
-{
-  Sequence *seq, *nseq;
-
-  BKE_sequencer_base_clipboard_pointers_free(&seqbase_clipboard);
-
-  for (seq = seqbase_clipboard.first; seq; seq = nseq) {
-    nseq = seq->next;
-    seq_free_sequence_recurse(NULL, seq, false);
-  }
-  BLI_listbase_clear(&seqbase_clipboard);
-}
-
-/* -------------------------------------------------------------------- */
-/* Manage pointers in the clipboard.
- * note that these pointers should _never_ be access in the sequencer,
- * they are only for storage while in the clipboard
- * notice 'newid' is used for temp pointer storage here, validate on access (this is safe usage,
- * since those data-blocks are fully out of Main lists).
- */
-#define ID_PT (*id_pt)
-static void seqclipboard_ptr_free(Main *UNUSED(bmain), ID **id_pt)
-{
-  if (ID_PT) {
-    BLI_assert(ID_PT->newid != NULL);
-    MEM_freeN(ID_PT);
-    ID_PT = NULL;
-  }
-}
-static void seqclipboard_ptr_store(Main *UNUSED(bmain), ID **id_pt)
-{
-  if (ID_PT) {
-    ID *id_prev = ID_PT;
-    ID_PT = MEM_dupallocN(ID_PT);
-    ID_PT->newid = id_prev;
-  }
-}
-static void seqclipboard_ptr_restore(Main *bmain, ID **id_pt)
-{
-  if (ID_PT) {
-    const ListBase *lb = which_libbase(bmain, GS(ID_PT->name));
-    void *id_restore;
-
-    BLI_assert(ID_PT->newid != NULL);
-    if (BLI_findindex(lb, (ID_PT)->newid) != -1) {
-      /* the pointer is still valid */
-      id_restore = (ID_PT)->newid;
-    }
-    else {
-      /* the pointer of the same name still exists  */
-      id_restore = BLI_findstring(lb, (ID_PT)->name + 2, offsetof(ID, name) + 2);
-    }
-
-    if (id_restore == NULL) {
-      /* check for a data with the same filename */
-      switch (GS(ID_PT->name)) {
-        case ID_SO: {
-          id_restore = BLI_findstring(lb, ((bSound *)ID_PT)->filepath, offsetof(bSound, filepath));
-          if (id_restore == NULL) {
-            id_restore = BKE_sound_new_file(bmain, ((bSound *)ID_PT)->filepath);
-            (ID_PT)->newid = id_restore; /* reuse next time */
-          }
-          break;
-        }
-        case ID_MC: {
-          id_restore = BLI_findstring(
-              lb, ((MovieClip *)ID_PT)->filepath, offsetof(MovieClip, filepath));
-          if (id_restore == NULL) {
-            id_restore = BKE_movieclip_file_add(bmain, ((MovieClip *)ID_PT)->filepath);
-            (ID_PT)->newid = id_restore; /* reuse next time */
-          }
-          break;
-        }
-        default:
-          break;
-      }
-    }
-
-    /* Replace with pointer to actual data-block. */
-    seqclipboard_ptr_free(bmain, id_pt);
-    ID_PT = id_restore;
-  }
-}
-#undef ID_PT
-
-static void sequence_clipboard_pointers(Main *bmain,
-                                        Sequence *seq,
-                                        void (*callback)(Main *, ID **))
-{
-  callback(bmain, (ID **)&seq->scene);
-  callback(bmain, (ID **)&seq->scene_camera);
-  callback(bmain, (ID **)&seq->clip);
-  callback(bmain, (ID **)&seq->mask);
-  callback(bmain, (ID **)&seq->sound);
-
-  if (seq->type == SEQ_TYPE_TEXT && seq->effectdata) {
-    TextVars *text_data = seq->effectdata;
-    callback(bmain, (ID **)&text_data->text_font);
-  }
-}
-
-/* recursive versions of functions above */
-void BKE_sequencer_base_clipboard_pointers_free(ListBase *seqbase)
-{
-  Sequence *seq;
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    sequence_clipboard_pointers(NULL, seq, seqclipboard_ptr_free);
-    BKE_sequencer_base_clipboard_pointers_free(&seq->seqbase);
-  }
-}
-void BKE_sequencer_base_clipboard_pointers_store(Main *bmain, ListBase *seqbase)
-{
-  Sequence *seq;
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    sequence_clipboard_pointers(bmain, seq, seqclipboard_ptr_store);
-    BKE_sequencer_base_clipboard_pointers_store(bmain, &seq->seqbase);
-  }
-}
-void BKE_sequencer_base_clipboard_pointers_restore(ListBase *seqbase, Main *bmain)
-{
-  Sequence *seq;
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    sequence_clipboard_pointers(bmain, seq, seqclipboard_ptr_restore);
-    BKE_sequencer_base_clipboard_pointers_restore(&seq->seqbase, bmain);
-  }
-}
-
-/* end clipboard pointer mess */
-
-Editing *BKE_sequencer_editing_ensure(Scene *scene)
-{
-  if (scene->ed == NULL) {
-    Editing *ed;
-
-    ed = scene->ed = MEM_callocN(sizeof(Editing), "addseq");
-    ed->seqbasep = &ed->seqbase;
-    ed->cache = NULL;
-    ed->cache_flag = SEQ_CACHE_STORE_FINAL_OUT;
-    ed->cache_flag |= SEQ_CACHE_VIEW_FINAL_OUT;
-    ed->cache_flag |= SEQ_CACHE_VIEW_ENABLE;
-    ed->recycle_max_cost = 10.0f;
-  }
-
-  return scene->ed;
-}
-
-void BKE_sequencer_editing_free(Scene *scene, const bool do_id_user)
-{
-  Editing *ed = scene->ed;
-  Sequence *seq;
-
-  if (ed == NULL) {
-    return;
-  }
-
-  BKE_sequencer_prefetch_free(scene);
-  BKE_sequencer_cache_destruct(scene);
-
-  SEQ_ALL_BEGIN (ed, seq) {
-    /* handle cache freeing above */
-    BKE_sequence_free_ex(scene, seq, false, do_id_user, false);
-  }
-  SEQ_ALL_END;
-
-  BLI_freelistN(&ed->metastack);
-  MEM_freeN(ed);
-
-  scene->ed = NULL;
-}
-
-/*********************** Sequencer color space functions  *************************/
-
-static void sequencer_imbuf_assign_spaces(Scene *scene, ImBuf *ibuf)
-{
-#if 0
-  /* Bute buffer is supposed to be in sequencer working space already. */
-  if (ibuf->rect != NULL) {
-    IMB_colormanagement_assign_rect_colorspace(ibuf, scene->sequencer_colorspace_settings.name);
-  }
-#endif
-  if (ibuf->rect_float != NULL) {
-    IMB_colormanagement_assign_float_colorspace(ibuf, scene->sequencer_colorspace_settings.name);
-  }
-}
-
-void BKE_sequencer_imbuf_to_sequencer_space(Scene *scene, ImBuf *ibuf, bool make_float)
-{
-  /* Early output check: if both buffers are NULL we have nothing to convert. */
-  if (ibuf->rect_float == NULL && ibuf->rect == NULL) {
-    return;
-  }
-  /* Get common conversion settings. */
-  const char *to_colorspace = scene->sequencer_colorspace_settings.name;
-  /* Perform actual conversion logic. */
-  if (ibuf->rect_float == NULL) {
-    /* We are not requested to give float buffer and byte buffer is already
-     * in thee required colorspace. Can skip doing anything here.
-     */
-    const char *from_colorspace = IMB_colormanagement_get_rect_colorspace(ibuf);
-    if (!make_float && STREQ(from_colorspace, to_colorspace)) {
-      return;
-    }
-    if (false) {
-      /* The idea here is to provide as fast playback as possible and
-       * enforcing float buffer here (a) uses more cache memory (b) might
-       * make some other effects slower to apply.
-       *
-       * However, this might also have negative effect by adding weird
-       * artifacts which will then not happen in final render.
-       */
-      IMB_colormanagement_transform_byte_threaded((unsigned char *)ibuf->rect,
-                                                  ibuf->x,
-                                                  ibuf->y,
-                                                  ibuf->channels,
-                                                  from_colorspace,
-                                                  to_colorspace);
-    }
-    else {
-      /* We perform conversion to a float buffer so we don't worry about
-       * precision loss.
-       */
-      imb_addrectfloatImBuf(ibuf);
-      IMB_colormanagement_transform_from_byte_threaded(ibuf->rect_float,
-                                                       (unsigned char *)ibuf->rect,
-                                                       ibuf->x,
-                                                       ibuf->y,
-                                                       ibuf->channels,
-                                                       from_colorspace,
-                                                       to_colorspace);
-      /* We don't need byte buffer anymore. */
-      imb_freerectImBuf(ibuf);
-    }
-  }
-  else {
-    const char *from_colorspace = IMB_colormanagement_get_float_colorspace(ibuf);
-    /* Unknown input color space, can't perform conversion. */
-    if (from_colorspace == NULL || from_colorspace[0] == '\0') {
-      return;
-    }
-    /* We don't want both byte and float buffers around: they'll either run
-     * out of sync or conversion of byte buffer will loose precision in there.
-     */
-    if (ibuf->rect != NULL) {
-      imb_freerectImBuf(ibuf);
-    }
-    IMB_colormanagement_transform_threaded(
-        ibuf->rect_float, ibuf->x, ibuf->y, ibuf->channels, from_colorspace, to_colorspace, true);
-  }
-  sequencer_imbuf_assign_spaces(scene, ibuf);
-}
-
-void BKE_sequencer_imbuf_from_sequencer_space(Scene *scene, ImBuf *ibuf)
-{
-  const char *from_colorspace = scene->sequencer_colorspace_settings.name;
-  const char *to_colorspace = IMB_colormanagement_role_colorspace_name_get(
-      COLOR_ROLE_SCENE_LINEAR);
-
-  if (!ibuf->rect_float) {
-    return;
-  }
-
-  if (to_colorspace && to_colorspace[0] != '\0') {
-    IMB_colormanagement_transform_threaded(
-        ibuf->rect_float, ibuf->x, ibuf->y, ibuf->channels, from_colorspace, to_colorspace, true);
-    IMB_colormanagement_assign_float_colorspace(ibuf, to_colorspace);
-  }
-}
-
-void BKE_sequencer_pixel_from_sequencer_space_v4(struct Scene *scene, float pixel[4])
-{
-  const char *from_colorspace = scene->sequencer_colorspace_settings.name;
-  const char *to_colorspace = IMB_colormanagement_role_colorspace_name_get(
-      COLOR_ROLE_SCENE_LINEAR);
-
-  if (to_colorspace && to_colorspace[0] != '\0') {
-    IMB_colormanagement_transform_v4(pixel, from_colorspace, to_colorspace);
-  }
-  else {
-    /* if no color management enables fallback to legacy conversion */
-    srgb_to_linearrgb_v4(pixel, pixel);
-  }
-}
-
-/*********************** sequencer pipeline functions *************************/
-
-void BKE_sequencer_new_render_data(Main *bmain,
-                                   struct Depsgraph *depsgraph,
-                                   Scene *scene,
-                                   int rectx,
-                                   int recty,
-                                   int preview_render_size,
-                                   int for_render,
-                                   SeqRenderData *r_context)
-{
-  r_context->bmain = bmain;
-  r_context->depsgraph = depsgraph;
-  r_context->scene = scene;
-  r_context->rectx = rectx;
-  r_context->recty = recty;
-  r_context->preview_render_size = preview_render_size;
-  r_context->for_render = for_render;
-  r_context->motion_blur_samples = 0;
-  r_context->motion_blur_shutter = 0;
-  r_context->skip_cache = false;
-  r_context->is_proxy_render = false;
-  r_context->view_id = 0;
-  r_context->gpu_offscreen = NULL;
-  r_context->task_id = SEQ_TASK_MAIN_RENDER;
-  r_context->is_prefetch_render = false;
-}
-
-/* ************************* iterator ************************** */
-/* *************** (replaces old WHILE_SEQ) ********************* */
-/* **************** use now SEQ_ALL_BEGIN () SEQ_ALL_END ***************** */
-
-/* sequence strip iterator:
- * - builds a full array, recursively into meta strips
- */
-
-static void seq_count(ListBase *seqbase, int *tot)
-{
-  Sequence *seq;
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    (*tot)++;
-
-    if (seq->seqbase.first) {
-      seq_count(&seq->seqbase, tot);
-    }
-  }
-}
-
-static void seq_build_array(ListBase *seqbase, Sequence ***array, int depth)
-{
-  Sequence *seq;
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    seq->depth = depth;
-
-    if (seq->seqbase.first) {
-      seq_build_array(&seq->seqbase, array, depth + 1);
-    }
-
-    **array = seq;
-    (*array)++;
-  }
-}
-
-static void seq_array(Editing *ed,
-                      Sequence ***seqarray,
-                      int *tot,
-                      const bool use_current_sequences)
-{
-  Sequence **array;
-
-  *seqarray = NULL;
-  *tot = 0;
-
-  if (ed == NULL) {
-    return;
-  }
-
-  if (use_current_sequences) {
-    seq_count(ed->seqbasep, tot);
-  }
-  else {
-    seq_count(&ed->seqbase, tot);
-  }
-
-  if (*tot == 0) {
-    return;
-  }
-
-  *seqarray = array = MEM_mallocN(sizeof(Sequence *) * (*tot), "SeqArray");
-  if (use_current_sequences) {
-    seq_build_array(ed->seqbasep, &array, 0);
-  }
-  else {
-    seq_build_array(&ed->seqbase, &array, 0);
-  }
-}
-
-void BKE_sequence_iterator_begin(Editing *ed, SeqIterator *iter, const bool use_current_sequences)
-{
-  memset(iter, 0, sizeof(*iter));
-  seq_array(ed, &iter->array, &iter->tot, use_current_sequences);
-
-  if (iter->tot) {
-    iter->cur = 0;
-    iter->seq = iter->array[iter->cur];
-    iter->valid = 1;
-  }
-}
-
-void BKE_sequence_iterator_next(SeqIterator *iter)
-{
-  if (++iter->cur < iter->tot) {
-    iter->seq = iter->array[iter->cur];
-  }
-  else {
-    iter->valid = 0;
-  }
-}
-
-void BKE_sequence_iterator_end(SeqIterator *iter)
-{
-  if (iter->array) {
-    MEM_freeN(iter->array);
-  }
-
-  iter->valid = 0;
-}
-
-static int metaseq_start(Sequence *metaseq)
-{
-  return metaseq->start + metaseq->startofs;
-}
-
-static int metaseq_end(Sequence *metaseq)
-{
-  return metaseq->start + metaseq->len - metaseq->endofs;
-}
-
-static void seq_update_sound_bounds_recursive_impl(Scene *scene,
-                                                   Sequence *metaseq,
-                                                   int start,
-                                                   int end)
-{
-  Sequence *seq;
-
-  /* for sound we go over full meta tree to update bounds of the sound strips,
-   * since sound is played outside of evaluating the imbufs, */
-  for (seq = metaseq->seqbase.first; seq; seq = seq->next) {
-    if (seq->type == SEQ_TYPE_META) {
-      seq_update_sound_bounds_recursive_impl(
-          scene, seq, max_ii(start, metaseq_start(seq)), min_ii(end, metaseq_end(seq)));
-    }
-    else if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SCENE)) {
-      if (seq->scene_sound) {
-        int startofs = seq->startofs;
-        int endofs = seq->endofs;
-        if (seq->startofs + seq->start < start) {
-          startofs = start - seq->start;
-        }
-
-        if (seq->start + seq->len - seq->endofs > end) {
-          endofs = seq->start + seq->len - end;
-        }
-
-        BKE_sound_move_scene_sound(scene,
-                                   seq->scene_sound,
-                                   seq->start + startofs,
-                                   seq->start + seq->len - endofs,
-                                   startofs + seq->anim_startofs);
-      }
-    }
-  }
-}
-
-static void seq_update_sound_bounds_recursive(Scene *scene, Sequence *metaseq)
-{
-  seq_update_sound_bounds_recursive_impl(
-      scene, metaseq, metaseq_start(metaseq), metaseq_end(metaseq));
-}
-
-void BKE_sequence_calc_disp(Scene *scene, Sequence *seq)
-{
-  if (seq->startofs && seq->startstill) {
-    seq->startstill = 0;
-  }
-  if (seq->endofs && seq->endstill) {
-    seq->endstill = 0;
-  }
-
-  seq->startdisp = seq->start + seq->startofs - seq->startstill;
-  seq->enddisp = seq->start + seq->len - seq->endofs + seq->endstill;
-
-  if (seq->type == SEQ_TYPE_META) {
-    seq_update_sound_bounds_recursive(scene, seq);
-  }
-}
-
-void BKE_sequence_calc(Scene *scene, Sequence *seq)
-{
-  Sequence *seqm;
-  int min, max;
-
-  /* check all metas recursively */
-  seqm = seq->seqbase.first;
-  while (seqm) {
-    if (seqm->seqbase.first) {
-      BKE_sequence_calc(scene, seqm);
-    }
-    seqm = seqm->next;
-  }
-
-  /* effects and meta: automatic start and end */
-  if (seq->type & SEQ_TYPE_EFFECT) {
-    if (seq->seq1) {
-      seq->startofs = seq->endofs = seq->startstill = seq->endstill = 0;
-      if (seq->seq3) {
-        seq->start = seq->startdisp = max_iii(
-            seq->seq1->startdisp, seq->seq2->startdisp, seq->seq3->startdisp);
-        seq->enddisp = min_iii(seq->seq1->enddisp, seq->seq2->enddisp, seq->seq3->enddisp);
-      }
-      else if (seq->seq2) {
-        seq->start = seq->startdisp = max_ii(seq->seq1->startdisp, seq->seq2->startdisp);
-        seq->enddisp = min_ii(seq->seq1->enddisp, seq->seq2->enddisp);
-      }
-      else {
-        seq->start = seq->startdisp = seq->seq1->startdisp;
-        seq->enddisp = seq->seq1->enddisp;
-      }
-      /* we cant help if strips don't overlap, it wont give useful results.
-       * but at least ensure 'len' is never negative which causes bad bugs elsewhere. */
-      if (seq->enddisp < seq->startdisp) {
-        /* simple start/end swap */
-        seq->start = seq->enddisp;
-        seq->enddisp = seq->startdisp;
-        seq->startdisp = seq->start;
-        seq->flag |= SEQ_INVALID_EFFECT;
-      }
-      else {
-        seq->flag &= ~SEQ_INVALID_EFFECT;
-      }
-
-      seq->len = seq->enddisp - seq->startdisp;
-    }
-    else {
-      BKE_sequence_calc_disp(scene, seq);
-    }
-  }
-  else {
-    if (seq->type == SEQ_TYPE_META) {
-      seqm = seq->seqbase.first;
-      if (seqm) {
-        min = MAXFRAME * 2;
-        max = -MAXFRAME * 2;
-        while (seqm) {
-          if (seqm->startdisp < min) {
-            min = seqm->startdisp;
-          }
-          if (seqm->enddisp > max) {
-            max = seqm->enddisp;
-          }
-          seqm = seqm->next;
-        }
-        seq->start = min + seq->anim_startofs;
-        seq->len = max - min;
-        seq->len -= seq->anim_startofs;
-        seq->len -= seq->anim_endofs;
-      }
-      seq_update_sound_bounds_recursive(scene, seq);
-    }
-    BKE_sequence_calc_disp(scene, seq);
-  }
-}
-
-static void seq_multiview_name(Scene *scene,
-                               const int view_id,
-                               const char *prefix,
-                               const char *ext,
-                               char *r_path,
-                               size_t r_size)
-{
-  const char *suffix = BKE_scene_multiview_view_id_suffix_get(&scene->r, view_id);
-  BLI_assert(ext != NULL && suffix != NULL && prefix != NULL);
-  BLI_snprintf(r_path, r_size, "%s%s%s", prefix, suffix, ext);
-}
-
-/* note: caller should run BKE_sequence_calc(scene, seq) after */
-void BKE_sequence_reload_new_file(Main *bmain, Scene *scene, Sequence *seq, const bool lock_range)
-{
-  char path[FILE_MAX];
-  int prev_startdisp = 0, prev_enddisp = 0;
-  /* note: don't rename the strip, will break animation curves */
-
-  if (ELEM(seq->type,
-           SEQ_TYPE_MOVIE,
-           SEQ_TYPE_IMAGE,
-           SEQ_TYPE_SOUND_RAM,
-           SEQ_TYPE_SCENE,
-           SEQ_TYPE_META,
-           SEQ_TYPE_MOVIECLIP,
-           SEQ_TYPE_MASK) == 0) {
-    return;
-  }
-
-  if (lock_range) {
-    /* keep so we don't have to move the actual start and end points (only the data) */
-    BKE_sequence_calc_disp(scene, seq);
-    prev_startdisp = seq->startdisp;
-    prev_enddisp = seq->enddisp;
-  }
-
-  switch (seq->type) {
-    case SEQ_TYPE_IMAGE: {
-      /* Hack? */
-      size_t olen = MEM_allocN_len(seq->strip->stripdata) / sizeof(StripElem);
-
-      seq->len = olen;
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-      break;
-    }
-    case SEQ_TYPE_MOVIE: {
-      StripAnim *sanim;
-      bool is_multiview_loaded = false;
-      const bool is_multiview = (seq->flag & SEQ_USE_VIEWS) != 0 &&
-                                (scene->r.scemode & R_MULTIVIEW) != 0;
-
-      BLI_join_dirfile(path, sizeof(path), seq->strip->dir, seq->strip->stripdata->name);
-      BLI_path_abs(path, BKE_main_blendfile_path_from_global());
-
-      BKE_sequence_free_anim(seq);
-
-      if (is_multiview && (seq->views_format == R_IMF_VIEWS_INDIVIDUAL)) {
-        char prefix[FILE_MAX];
-        const char *ext = NULL;
-        const int totfiles = seq_num_files(scene, seq->views_format, true);
-        int i = 0;
-
-        BKE_scene_multiview_view_prefix_get(scene, path, prefix, &ext);
-
-        if (prefix[0] != '\0') {
-          for (i = 0; i < totfiles; i++) {
-            struct anim *anim;
-            char str[FILE_MAX];
-
-            seq_multiview_name(scene, i, prefix, ext, str, FILE_MAX);
-            anim = openanim(str,
-                            IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                            seq->streamindex,
-                            seq->strip->colorspace_settings.name);
-
-            if (anim) {
-              seq_anim_add_suffix(scene, anim, i);
-              sanim = MEM_mallocN(sizeof(StripAnim), "Strip Anim");
-              BLI_addtail(&seq->anims, sanim);
-              sanim->anim = anim;
-            }
-          }
-          is_multiview_loaded = true;
-        }
-      }
-
-      if (is_multiview_loaded == false) {
-        struct anim *anim;
-        anim = openanim(path,
-                        IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                        seq->streamindex,
-                        seq->strip->colorspace_settings.name);
-        if (anim) {
-          sanim = MEM_mallocN(sizeof(StripAnim), "Strip Anim");
-          BLI_addtail(&seq->anims, sanim);
-          sanim->anim = anim;
-        }
-      }
-
-      /* use the first video as reference for everything */
-      sanim = seq->anims.first;
-
-      if ((!sanim) || (!sanim->anim)) {
-        return;
-      }
-
-      IMB_anim_load_metadata(sanim->anim);
-
-      seq->len = IMB_anim_get_duration(
-          sanim->anim, seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN);
-
-      seq->anim_preseek = IMB_anim_get_preseek(sanim->anim);
-
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-      break;
-    }
-    case SEQ_TYPE_MOVIECLIP:
-      if (seq->clip == NULL) {
-        return;
-      }
-
-      seq->len = BKE_movieclip_get_duration(seq->clip);
-
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-      break;
-    case SEQ_TYPE_MASK:
-      if (seq->mask == NULL) {
-        return;
-      }
-      seq->len = BKE_mask_get_duration(seq->mask);
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-      break;
-    case SEQ_TYPE_SOUND_RAM:
-#ifdef WITH_AUDASPACE
-      if (!seq->sound) {
-        return;
-      }
-      seq->len = ceil((double)BKE_sound_get_length(bmain, seq->sound) * FPS);
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-#else
-      UNUSED_VARS(bmain);
-      return;
-#endif
-      break;
-    case SEQ_TYPE_SCENE: {
-      seq->len = (seq->scene) ? seq->scene->r.efra - seq->scene->r.sfra + 1 : 0;
-      seq->len -= seq->anim_startofs;
-      seq->len -= seq->anim_endofs;
-      if (seq->len < 0) {
-        seq->len = 0;
-      }
-      break;
-    }
-  }
-
-  free_proxy_seq(seq);
-
-  if (lock_range) {
-    BKE_sequence_tx_set_final_left(seq, prev_startdisp);
-    BKE_sequence_tx_set_final_right(seq, prev_enddisp);
-    BKE_sequence_single_fix(seq);
-  }
-
-  BKE_sequence_calc(scene, seq);
-}
-
-void BKE_sequence_movie_reload_if_needed(struct Main *bmain,
-                                         struct Scene *scene,
-                                         struct Sequence *seq,
-                                         bool *r_was_reloaded,
-                                         bool *r_can_produce_frames)
-{
-  BLI_assert(seq->type == SEQ_TYPE_MOVIE ||
-             !"This function is only implemented for movie strips.");
-
-  bool must_reload = false;
-
-  /* The Sequence struct allows for multiple anim structs to be associated with one strip. This
-   * function will return true only if there is at least one 'anim' AND all anims can produce
-   * frames. */
-
-  if (BLI_listbase_is_empty(&seq->anims)) {
-    /* No anim present, so reloading is always necessary. */
-    must_reload = true;
-  }
-  else {
-    LISTBASE_FOREACH (StripAnim *, sanim, &seq->anims) {
-      if (!IMB_anim_can_produce_frames(sanim->anim)) {
-        /* Anim cannot produce frames, try reloading. */
-        must_reload = true;
-        break;
-      }
-    };
-  }
-
-  if (!must_reload) {
-    /* There are one or more anims, and all can produce frames. */
-    *r_was_reloaded = false;
-    *r_can_produce_frames = true;
-    return;
-  }
-
-  BKE_sequence_reload_new_file(bmain, scene, seq, true);
-  *r_was_reloaded = true;
-
-  if (BLI_listbase_is_empty(&seq->anims)) {
-    /* No anims present after reloading => no frames can be produced. */
-    *r_can_produce_frames = false;
-    return;
-  }
-
-  /* Check if there are still anims that cannot produce frames. */
-  LISTBASE_FOREACH (StripAnim *, sanim, &seq->anims) {
-    if (!IMB_anim_can_produce_frames(sanim->anim)) {
-      /* There still is an anim that cannot produce frames. */
-      *r_can_produce_frames = false;
-      return;
-    }
-  };
-
-  /* There are one or more anims, and all can produce frames. */
-  *r_can_produce_frames = true;
-}
-
-void BKE_sequencer_sort(Scene *scene)
-{
-  /* all strips together per kind, and in order of y location ("machine") */
-  ListBase seqbase, effbase;
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  Sequence *seq, *seqt;
-
-  if (ed == NULL) {
-    return;
-  }
-
-  BLI_listbase_clear(&seqbase);
-  BLI_listbase_clear(&effbase);
-
-  while ((seq = BLI_pophead(ed->seqbasep))) {
-
-    if (seq->type & SEQ_TYPE_EFFECT) {
-      seqt = effbase.first;
-      while (seqt) {
-        if (seqt->machine >= seq->machine) {
-          BLI_insertlinkbefore(&effbase, seqt, seq);
-          break;
-        }
-        seqt = seqt->next;
-      }
-      if (seqt == NULL) {
-        BLI_addtail(&effbase, seq);
-      }
-    }
-    else {
-      seqt = seqbase.first;
-      while (seqt) {
-        if (seqt->machine >= seq->machine) {
-          BLI_insertlinkbefore(&seqbase, seqt, seq);
-          break;
-        }
-        seqt = seqt->next;
-      }
-      if (seqt == NULL) {
-        BLI_addtail(&seqbase, seq);
-      }
-    }
-  }
-
-  BLI_movelisttolist(&seqbase, &effbase);
-  *(ed->seqbasep) = seqbase;
-}
-
-/** Comparison function suitable to be used with BLI_listbase_sort()... */
-int BKE_sequencer_cmp_time_startdisp(const void *a, const void *b)
-{
-  const Sequence *seq_a = a;
-  const Sequence *seq_b = b;
-
-  return (seq_a->startdisp > seq_b->startdisp);
-}
-
-static int clear_scene_in_allseqs_fn(Sequence *seq, void *arg_pt)
-{
-  if (seq->scene == (Scene *)arg_pt) {
-    seq->scene = NULL;
-  }
-  return 1;
-}
-
-void BKE_sequencer_clear_scene_in_allseqs(Main *bmain, Scene *scene)
-{
-  Scene *scene_iter;
-
-  /* when a scene is deleted: test all seqs */
-  for (scene_iter = bmain->scenes.first; scene_iter; scene_iter = scene_iter->id.next) {
-    if (scene_iter != scene && scene_iter->ed) {
-      BKE_sequencer_base_recursive_apply(
-          &scene_iter->ed->seqbase, clear_scene_in_allseqs_fn, scene);
-    }
-  }
-}
-
-typedef struct SeqUniqueInfo {
-  Sequence *seq;
-  char name_src[SEQ_NAME_MAXSTR];
-  char name_dest[SEQ_NAME_MAXSTR];
-  int count;
-  int match;
-} SeqUniqueInfo;
-
-static void seqbase_unique_name(ListBase *seqbasep, SeqUniqueInfo *sui)
-{
-  Sequence *seq;
-  for (seq = seqbasep->first; seq; seq = seq->next) {
-    if ((sui->seq != seq) && STREQ(sui->name_dest, seq->name + 2)) {
-      /* SEQ_NAME_MAXSTR -4 for the number, -1 for \0, - 2 for r_prefix */
-      BLI_snprintf(sui->name_dest,
-                   sizeof(sui->name_dest),
-                   "%.*s.%03d",
-                   SEQ_NAME_MAXSTR - 4 - 1 - 2,
-                   sui->name_src,
-                   sui->count++);
-      sui->match = 1; /* be sure to re-scan */
-    }
-  }
-}
-
-static int seqbase_unique_name_recursive_fn(Sequence *seq, void *arg_pt)
-{
-  if (seq->seqbase.first) {
-    seqbase_unique_name(&seq->seqbase, (SeqUniqueInfo *)arg_pt);
-  }
-  return 1;
-}
-
-void BKE_sequence_base_unique_name_recursive(ListBase *seqbasep, Sequence *seq)
-{
-  SeqUniqueInfo sui;
-  char *dot;
-  sui.seq = seq;
-  BLI_strncpy(sui.name_src, seq->name + 2, sizeof(sui.name_src));
-  BLI_strncpy(sui.name_dest, seq->name + 2, sizeof(sui.name_dest));
-
-  sui.count = 1;
-  sui.match = 1; /* assume the worst to start the loop */
-
-  /* Strip off the suffix */
-  if ((dot = strrchr(sui.name_src, '.'))) {
-    *dot = '\0';
-    dot++;
-
-    if (*dot) {
-      sui.count = atoi(dot) + 1;
-    }
-  }
-
-  while (sui.match) {
-    sui.match = 0;
-    seqbase_unique_name(seqbasep, &sui);
-    BKE_sequencer_base_recursive_apply(seqbasep, seqbase_unique_name_recursive_fn, &sui);
-  }
-
-  BLI_strncpy(seq->name + 2, sui.name_dest, sizeof(seq->name) - 2);
-}
-
-static const char *give_seqname_by_type(int type)
-{
-  switch (type) {
-    case SEQ_TYPE_META:
-      return "Meta";
-    case SEQ_TYPE_IMAGE:
-      return "Image";
-    case SEQ_TYPE_SCENE:
-      return "Scene";
-    case SEQ_TYPE_MOVIE:
-      return "Movie";
-    case SEQ_TYPE_MOVIECLIP:
-      return "Clip";
-    case SEQ_TYPE_MASK:
-      return "Mask";
-    case SEQ_TYPE_SOUND_RAM:
-      return "Audio";
-    case SEQ_TYPE_CROSS:
-      return "Cross";
-    case SEQ_TYPE_GAMCROSS:
-      return "Gamma Cross";
-    case SEQ_TYPE_ADD:
-      return "Add";
-    case SEQ_TYPE_SUB:
-      return "Sub";
-    case SEQ_TYPE_MUL:
-      return "Mul";
-    case SEQ_TYPE_ALPHAOVER:
-      return "Alpha Over";
-    case SEQ_TYPE_ALPHAUNDER:
-      return "Alpha Under";
-    case SEQ_TYPE_OVERDROP:
-      return "Over Drop";
-    case SEQ_TYPE_COLORMIX:
-      return "Color Mix";
-    case SEQ_TYPE_WIPE:
-      return "Wipe";
-    case SEQ_TYPE_GLOW:
-      return "Glow";
-    case SEQ_TYPE_TRANSFORM:
-      return "Transform";
-    case SEQ_TYPE_COLOR:
-      return "Color";
-    case SEQ_TYPE_MULTICAM:
-      return "Multicam";
-    case SEQ_TYPE_ADJUSTMENT:
-      return "Adjustment";
-    case SEQ_TYPE_SPEED:
-      return "Speed";
-    case SEQ_TYPE_GAUSSIAN_BLUR:
-      return "Gaussian Blur";
-    case SEQ_TYPE_TEXT:
-      return "Text";
-    default:
-      return NULL;
-  }
-}
-
-const char *BKE_sequence_give_name(Sequence *seq)
-{
-  const char *name = give_seqname_by_type(seq->type);
-
-  if (!name) {
-    if (!(seq->type & SEQ_TYPE_EFFECT)) {
-      return seq->strip->dir;
-    }
-
-    return "Effect";
-  }
-  return name;
-}
-
-ListBase *BKE_sequence_seqbase_get(Sequence *seq, int *r_offset)
-{
-  ListBase *seqbase = NULL;
-
-  switch (seq->type) {
-    case SEQ_TYPE_META: {
-      seqbase = &seq->seqbase;
-      *r_offset = seq->start;
-      break;
-    }
-    case SEQ_TYPE_SCENE: {
-      if (seq->flag & SEQ_SCENE_STRIPS && seq->scene) {
-        Editing *ed = BKE_sequencer_editing_get(seq->scene, false);
-        if (ed) {
-          seqbase = &ed->seqbase;
-          *r_offset = seq->scene->r.sfra;
-        }
-      }
-      break;
-    }
-  }
-
-  return seqbase;
-}
-
-/*********************** DO THE SEQUENCE *************************/
-
-static void multibuf(ImBuf *ibuf, const float fmul)
-{
-  char *rt;
-  float *rt_float;
-
-  int a;
-
-  rt = (char *)ibuf->rect;
-  rt_float = ibuf->rect_float;
-
-  if (rt) {
-    const int imul = (int)(256.0f * fmul);
-    a = ibuf->x * ibuf->y;
-    while (a--) {
-      rt[0] = min_ii((imul * rt[0]) >> 8, 255);
-      rt[1] = min_ii((imul * rt[1]) >> 8, 255);
-      rt[2] = min_ii((imul * rt[2]) >> 8, 255);
-      rt[3] = min_ii((imul * rt[3]) >> 8, 255);
-
-      rt += 4;
-    }
-  }
-  if (rt_float) {
-    a = ibuf->x * ibuf->y;
-    while (a--) {
-      rt_float[0] *= fmul;
-      rt_float[1] *= fmul;
-      rt_float[2] *= fmul;
-      rt_float[3] *= fmul;
-
-      rt_float += 4;
-    }
-  }
-}
-
-float BKE_sequencer_give_stripelem_index(Sequence *seq, float cfra)
-{
-  float nr;
-  int sta = seq->start;
-  int end = seq->start + seq->len - 1;
-
-  if (seq->type & SEQ_TYPE_EFFECT) {
-    end = seq->enddisp;
-  }
-
-  if (end < sta) {
-    return -1;
-  }
-
-  if (seq->flag & SEQ_REVERSE_FRAMES) {
-    /*reverse frame in this sequence */
-    if (cfra <= sta) {
-      nr = end - sta;
-    }
-    else if (cfra >= end) {
-      nr = 0;
-    }
-    else {
-      nr = end - cfra;
-    }
-  }
-  else {
-    if (cfra <= sta) {
-      nr = 0;
-    }
-    else if (cfra >= end) {
-      nr = end - sta;
-    }
-    else {
-      nr = cfra - sta;
-    }
-  }
-
-  if (seq->strobe < 1.0f) {
-    seq->strobe = 1.0f;
-  }
-
-  if (seq->strobe > 1.0f) {
-    nr -= fmodf((double)nr, (double)seq->strobe);
-  }
-
-  return nr;
-}
-
-StripElem *BKE_sequencer_give_stripelem(Sequence *seq, int cfra)
-{
-  StripElem *se = seq->strip->stripdata;
-
-  if (seq->type == SEQ_TYPE_IMAGE) {
-    /* only IMAGE strips use the whole array, MOVIE strips use only the first element,
-     * all other strips don't use this...
-     */
-
-    int nr = (int)BKE_sequencer_give_stripelem_index(seq, cfra);
-
-    if (nr == -1 || se == NULL) {
-      return NULL;
-    }
-
-    se += nr + seq->anim_startofs;
-  }
-  return se;
-}
-
-static int evaluate_seq_frame_gen(Sequence **seq_arr, ListBase *seqbase, int cfra, int chanshown)
-{
-  /* Use arbitrary sized linked list, the size could be over MAXSEQ. */
-  LinkNodePair effect_inputs = {NULL, NULL};
-  int totseq = 0;
-
-  memset(seq_arr, 0, sizeof(Sequence *) * (MAXSEQ + 1));
-
-  LISTBASE_FOREACH (Sequence *, seq, seqbase) {
-    if ((seq->startdisp <= cfra) && (seq->enddisp > cfra)) {
-      if ((seq->type & SEQ_TYPE_EFFECT) && !(seq->flag & SEQ_MUTE)) {
-
-        if (seq->seq1) {
-          BLI_linklist_append_alloca(&effect_inputs, seq->seq1);
-        }
-
-        if (seq->seq2) {
-          BLI_linklist_append_alloca(&effect_inputs, seq->seq2);
-        }
-
-        if (seq->seq3) {
-          BLI_linklist_append_alloca(&effect_inputs, seq->seq3);
-        }
-      }
-
-      seq_arr[seq->machine] = seq;
-      totseq++;
-    }
-  }
-
-  /* Drop strips which are used for effect inputs, we don't want
-   * them to blend into render stack in any other way than effect
-   * string rendering. */
-  for (LinkNode *seq_item = effect_inputs.list; seq_item; seq_item = seq_item->next) {
-    Sequence *seq = seq_item->link;
-    /* It's possible that effect strip would be placed to the same
-     * 'machine' as it's inputs. We don't want to clear such strips
-     * from the stack. */
-    if (seq_arr[seq->machine] && seq_arr[seq->machine]->type & SEQ_TYPE_EFFECT) {
-      continue;
-    }
-    /* If we're shown a specified channel, then we want to see the strips
-     * which belongs to this machine. */
-    if (chanshown != 0 && chanshown <= seq->machine) {
-      continue;
-    }
-    seq_arr[seq->machine] = NULL;
-  }
-
-  return totseq;
-}
-
-int BKE_sequencer_evaluate_frame(Scene *scene, int cfra)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  Sequence *seq_arr[MAXSEQ + 1];
-
-  if (ed == NULL) {
-    return 0;
-  }
-
-  return evaluate_seq_frame_gen(seq_arr, ed->seqbasep, cfra, 0);
-}
-
-static bool video_seq_is_rendered(Sequence *seq)
-{
-  return (seq && !(seq->flag & SEQ_MUTE) && seq->type != SEQ_TYPE_SOUND_RAM);
-}
-
-int BKE_sequencer_get_shown_sequences(ListBase *seqbasep,
-                                      int cfra,
-                                      int chanshown,
-                                      Sequence **seq_arr_out)
-{
-  Sequence *seq_arr[MAXSEQ + 1];
-  int b = chanshown;
-  int cnt = 0;
-
-  if (b > MAXSEQ) {
-    return 0;
-  }
-
-  if (evaluate_seq_frame_gen(seq_arr, seqbasep, cfra, chanshown)) {
-    if (b == 0) {
-      b = MAXSEQ;
-    }
-    for (; b > 0; b--) {
-      if (video_seq_is_rendered(seq_arr[b])) {
-        break;
-      }
-    }
-  }
-
-  chanshown = b;
-
-  for (; b > 0; b--) {
-    if (video_seq_is_rendered(seq_arr[b])) {
-      if (seq_arr[b]->blend_mode == SEQ_BLEND_REPLACE) {
-        break;
-      }
-    }
-  }
-
-  for (; b <= chanshown && b >= 0; b++) {
-    if (video_seq_is_rendered(seq_arr[b])) {
-      seq_arr_out[cnt++] = seq_arr[b];
-    }
-  }
-
-  return cnt;
-}
-
-/*********************** proxy management *************************/
-
-typedef struct SeqIndexBuildContext {
-  struct IndexBuildContext *index_context;
-
-  int tc_flags;
-  int size_flags;
-  int quality;
-  bool overwrite;
-  int view_id;
-
-  Main *bmain;
-  Depsgraph *depsgraph;
-  Scene *scene;
-  Sequence *seq, *orig_seq;
-} SeqIndexBuildContext;
-
-#define PROXY_MAXFILE (2 * FILE_MAXDIR + FILE_MAXFILE)
-
-static IMB_Proxy_Size seq_rendersize_to_proxysize(int render_size)
-{
-  switch (render_size) {
-    case SEQ_RENDER_SIZE_PROXY_25:
-      return IMB_PROXY_25;
-    case SEQ_RENDER_SIZE_PROXY_50:
-      return IMB_PROXY_50;
-    case SEQ_RENDER_SIZE_PROXY_75:
-      return IMB_PROXY_75;
-    case SEQ_RENDER_SIZE_PROXY_100:
-      return IMB_PROXY_100;
-  }
-  return IMB_PROXY_NONE;
-}
-
-double BKE_sequencer_rendersize_to_scale_factor(int render_size)
-{
-  switch (render_size) {
-    case SEQ_RENDER_SIZE_PROXY_25:
-      return 0.25;
-    case SEQ_RENDER_SIZE_PROXY_50:
-      return 0.50;
-    case SEQ_RENDER_SIZE_PROXY_75:
-      return 0.75;
-  }
-  return 1.0;
-}
-
-/* the number of files will vary according to the stereo format */
-static int seq_num_files(Scene *scene, char views_format, const bool is_multiview)
-{
-  if (!is_multiview) {
-    return 1;
-  }
-  if (views_format == R_IMF_VIEWS_STEREO_3D) {
-    return 1;
-  }
-  /* R_IMF_VIEWS_INDIVIDUAL */
-
-  return BKE_scene_multiview_num_views_get(&scene->r);
-}
-
-static void seq_proxy_index_dir_set(struct anim *anim, const char *base_dir)
-{
-  char dir[FILE_MAX];
-  char fname[FILE_MAXFILE];
-
-  IMB_anim_get_fname(anim, fname, FILE_MAXFILE);
-  BLI_strncpy(dir, base_dir, sizeof(dir));
-  BLI_path_append(dir, sizeof(dir), fname);
-  IMB_anim_set_index_dir(anim, dir);
-}
-
-static void seq_open_anim_file(Scene *scene, Sequence *seq, bool openfile)
-{
-  char dir[FILE_MAX];
-  char name[FILE_MAX];
-  StripProxy *proxy;
-  bool use_proxy;
-  bool is_multiview_loaded = false;
-  Editing *ed = scene->ed;
-  const bool is_multiview = (seq->flag & SEQ_USE_VIEWS) != 0 &&
-                            (scene->r.scemode & R_MULTIVIEW) != 0;
-
-  if ((seq->anims.first != NULL) && (((StripAnim *)seq->anims.first)->anim != NULL)) {
-    return;
-  }
-
-  /* reset all the previously created anims */
-  BKE_sequence_free_anim(seq);
-
-  BLI_join_dirfile(name, sizeof(name), seq->strip->dir, seq->strip->stripdata->name);
-  BLI_path_abs(name, BKE_main_blendfile_path_from_global());
-
-  proxy = seq->strip->proxy;
-
-  use_proxy = proxy && ((proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_DIR) != 0 ||
-                        (ed->proxy_storage == SEQ_EDIT_PROXY_DIR_STORAGE));
-
-  if (use_proxy) {
-    if (ed->proxy_storage == SEQ_EDIT_PROXY_DIR_STORAGE) {
-      if (ed->proxy_dir[0] == 0) {
-        BLI_strncpy(dir, "//BL_proxy", sizeof(dir));
-      }
-      else {
-        BLI_strncpy(dir, ed->proxy_dir, sizeof(dir));
-      }
-    }
-    else {
-      BLI_strncpy(dir, seq->strip->proxy->dir, sizeof(dir));
-    }
-    BLI_path_abs(dir, BKE_main_blendfile_path_from_global());
-  }
-
-  if (is_multiview && seq->views_format == R_IMF_VIEWS_INDIVIDUAL) {
-    int totfiles = seq_num_files(scene, seq->views_format, true);
-    char prefix[FILE_MAX];
-    const char *ext = NULL;
-    int i;
-
-    BKE_scene_multiview_view_prefix_get(scene, name, prefix, &ext);
-
-    if (prefix[0] != '\0') {
-      for (i = 0; i < totfiles; i++) {
-        const char *suffix = BKE_scene_multiview_view_id_suffix_get(&scene->r, i);
-        char str[FILE_MAX];
-        StripAnim *sanim = MEM_mallocN(sizeof(StripAnim), "Strip Anim");
-
-        BLI_addtail(&seq->anims, sanim);
-
-        BLI_snprintf(str, sizeof(str), "%s%s%s", prefix, suffix, ext);
-
-        if (openfile) {
-          sanim->anim = openanim(str,
-                                 IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                                 seq->streamindex,
-                                 seq->strip->colorspace_settings.name);
-        }
-        else {
-          sanim->anim = openanim_noload(str,
-                                        IB_rect |
-                                            ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                                        seq->streamindex,
-                                        seq->strip->colorspace_settings.name);
-        }
-
-        if (sanim->anim) {
-          /* we already have the suffix */
-          IMB_suffix_anim(sanim->anim, suffix);
-        }
-        else {
-          if (openfile) {
-            sanim->anim = openanim(name,
-                                   IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                                   seq->streamindex,
-                                   seq->strip->colorspace_settings.name);
-          }
-          else {
-            sanim->anim = openanim_noload(name,
-                                          IB_rect |
-                                              ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                                          seq->streamindex,
-                                          seq->strip->colorspace_settings.name);
-          }
-
-          /* No individual view files - monoscopic, stereo 3d or EXR multi-view. */
-          totfiles = 1;
-        }
-
-        if (sanim->anim && use_proxy) {
-          seq_proxy_index_dir_set(sanim->anim, dir);
-        }
-      }
-      is_multiview_loaded = true;
-    }
-  }
-
-  if (is_multiview_loaded == false) {
-    StripAnim *sanim;
-
-    sanim = MEM_mallocN(sizeof(StripAnim), "Strip Anim");
-    BLI_addtail(&seq->anims, sanim);
-
-    if (openfile) {
-      sanim->anim = openanim(name,
-                             IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                             seq->streamindex,
-                             seq->strip->colorspace_settings.name);
-    }
-    else {
-      sanim->anim = openanim_noload(name,
-                                    IB_rect | ((seq->flag & SEQ_FILTERY) ? IB_animdeinterlace : 0),
-                                    seq->streamindex,
-                                    seq->strip->colorspace_settings.name);
-    }
-
-    if (sanim->anim && use_proxy) {
-      seq_proxy_index_dir_set(sanim->anim, dir);
-    }
-  }
-}
-
-static bool seq_proxy_get_custom_file_fname(Sequence *seq, char *name, const int view_id)
-{
-  char fname[FILE_MAXFILE];
-  char suffix[24];
-  StripProxy *proxy = seq->strip->proxy;
-
-  if (proxy == NULL) {
-    return false;
-  }
-
-  BLI_join_dirfile(fname, PROXY_MAXFILE, proxy->dir, proxy->file);
-  BLI_path_abs(fname, BKE_main_blendfile_path_from_global());
-
-  if (view_id > 0) {
-    BLI_snprintf(suffix, sizeof(suffix), "_%d", view_id);
-    /* TODO(sergey): This will actually append suffix after extension
-     * which is weird but how was originally coded in multi-view branch.
-     */
-    BLI_snprintf(name, PROXY_MAXFILE, "%s_%s", fname, suffix);
-  }
-  else {
-    BLI_strncpy(name, fname, PROXY_MAXFILE);
-  }
-
-  return true;
-}
-
-static bool seq_proxy_get_fname(Editing *ed,
-                                Sequence *seq,
-                                int cfra,
-                                eSpaceSeq_Proxy_RenderSize render_size,
-                                char *name,
-                                const int view_id)
-{
-  char dir[PROXY_MAXFILE];
-  char suffix[24] = {'\0'};
-  StripProxy *proxy = seq->strip->proxy;
-
-  if (proxy == NULL) {
-    return false;
-  }
-
-  /* Multi-view suffix. */
-  if (view_id > 0) {
-    BLI_snprintf(suffix, sizeof(suffix), "_%d", view_id);
-  }
-
-  /* Per strip with Custom file situation is handled separately. */
-  if (proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_FILE &&
-      ed->proxy_storage != SEQ_EDIT_PROXY_DIR_STORAGE) {
-    if (seq_proxy_get_custom_file_fname(seq, name, view_id)) {
-      return true;
-    }
-  }
-
-  if (ed->proxy_storage == SEQ_EDIT_PROXY_DIR_STORAGE) {
-    /* Per project default. */
-    if (ed->proxy_dir[0] == 0) {
-      BLI_strncpy(dir, "//BL_proxy", sizeof(dir));
-    }
-    else { /* Per project with custom dir. */
-      BLI_strncpy(dir, ed->proxy_dir, sizeof(dir));
-    }
-    BLI_path_abs(name, BKE_main_blendfile_path_from_global());
-  }
-  else {
-    /* Pre strip with custom dir. */
-    if (proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_DIR) {
-      BLI_strncpy(dir, seq->strip->proxy->dir, sizeof(dir));
-    }
-    else { /* Per strip default. */
-      BLI_snprintf(dir, PROXY_MAXFILE, "%s/BL_proxy", seq->strip->dir);
-    }
-  }
-
-  /* Proxy size number to be used in path. */
-  int proxy_size_number = BKE_sequencer_rendersize_to_scale_factor(render_size) * 100;
-
-  BLI_snprintf(name,
-               PROXY_MAXFILE,
-               "%s/images/%d/%s_proxy%s",
-               dir,
-               proxy_size_number,
-               BKE_sequencer_give_stripelem(seq, cfra)->name,
-               suffix);
-  BLI_path_abs(name, BKE_main_blendfile_path_from_global());
-  strcat(name, ".jpg");
-
-  return true;
-}
-
-static bool seq_can_use_proxy(Sequence *seq, IMB_Proxy_Size psize)
-{
-  if (seq->strip->proxy == NULL) {
-    return false;
-  }
-  short size_flags = seq->strip->proxy->build_size_flags;
-  return (seq->flag & SEQ_USE_PROXY) != 0 && psize != IMB_PROXY_NONE && (size_flags & psize) != 0;
-}
-
-static ImBuf *seq_proxy_fetch(const SeqRenderData *context, Sequence *seq, int cfra)
-{
-  char name[PROXY_MAXFILE];
-  StripProxy *proxy = seq->strip->proxy;
-  const eSpaceSeq_Proxy_RenderSize psize = context->preview_render_size;
-  Editing *ed = context->scene->ed;
-  StripAnim *sanim;
-
-  /* only use proxies, if they are enabled (even if present!) */
-  if (!seq_can_use_proxy(seq, seq_rendersize_to_proxysize(psize))) {
-    return NULL;
-  }
-
-  if (proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_FILE) {
-    int frameno = (int)BKE_sequencer_give_stripelem_index(seq, cfra) + seq->anim_startofs;
-    if (proxy->anim == NULL) {
-      if (seq_proxy_get_fname(ed, seq, cfra, psize, name, context->view_id) == 0) {
-        return NULL;
-      }
-
-      proxy->anim = openanim(name, IB_rect, 0, seq->strip->colorspace_settings.name);
-    }
-    if (proxy->anim == NULL) {
-      return NULL;
-    }
-
-    seq_open_anim_file(context->scene, seq, true);
-    sanim = seq->anims.first;
-
-    frameno = IMB_anim_index_get_frame_index(
-        sanim ? sanim->anim : NULL, seq->strip->proxy->tc, frameno);
-
-    return IMB_anim_absolute(proxy->anim, frameno, IMB_TC_NONE, IMB_PROXY_NONE);
-  }
-
-  if (seq_proxy_get_fname(ed, seq, cfra, psize, name, context->view_id) == 0) {
-    return NULL;
-  }
-
-  if (BLI_exists(name)) {
-    ImBuf *ibuf = IMB_loadiffname(name, IB_rect, NULL);
-
-    if (ibuf) {
-      sequencer_imbuf_assign_spaces(context->scene, ibuf);
-    }
-
-    return ibuf;
-  }
-
-  return NULL;
-}
-
-static void seq_proxy_build_frame(const SeqRenderData *context,
-                                  SeqRenderState *state,
-                                  Sequence *seq,
-                                  int cfra,
-                                  int proxy_render_size,
-                                  const bool overwrite)
-{
-  char name[PROXY_MAXFILE];
-  int quality;
-  int rectx, recty;
-  int ok;
-  ImBuf *ibuf_tmp, *ibuf;
-  Editing *ed = context->scene->ed;
-
-  if (!seq_proxy_get_fname(ed, seq, cfra, proxy_render_size, name, context->view_id)) {
-    return;
-  }
-
-  if (!overwrite && BLI_exists(name)) {
-    return;
-  }
-
-  ibuf_tmp = seq_render_strip(context, state, seq, cfra);
-
-  rectx = (proxy_render_size * ibuf_tmp->x) / 100;
-  recty = (proxy_render_size * ibuf_tmp->y) / 100;
-
-  if (ibuf_tmp->x != rectx || ibuf_tmp->y != recty) {
-    ibuf = IMB_dupImBuf(ibuf_tmp);
-    IMB_metadata_copy(ibuf, ibuf_tmp);
-    IMB_freeImBuf(ibuf_tmp);
-    IMB_scalefastImBuf(ibuf, (short)rectx, (short)recty);
-  }
-  else {
-    ibuf = ibuf_tmp;
-  }
-
-  /* depth = 32 is intentionally left in, otherwise ALPHA channels
-   * won't work... */
-  quality = seq->strip->proxy->quality;
-  ibuf->ftype = IMB_FTYPE_JPG;
-  ibuf->foptions.quality = quality;
-
-  /* unsupported feature only confuses other s/w */
-  if (ibuf->planes == 32) {
-    ibuf->planes = 24;
-  }
-
-  BLI_make_existing_file(name);
-
-  ok = IMB_saveiff(ibuf, name, IB_rect | IB_zbuf | IB_zbuffloat);
-  if (ok == 0) {
-    perror(name);
-  }
-
-  IMB_freeImBuf(ibuf);
-}
-
-/**
- * Returns whether the file this context would read from even exist,
- * if not, don't create the context
- */
-static bool seq_proxy_multiview_context_invalid(Sequence *seq, Scene *scene, const int view_id)
-{
-  if ((scene->r.scemode & R_MULTIVIEW) == 0) {
-    return false;
-  }
-
-  if ((seq->type == SEQ_TYPE_IMAGE) && (seq->views_format == R_IMF_VIEWS_INDIVIDUAL)) {
-    static char prefix[FILE_MAX];
-    static const char *ext = NULL;
-    char str[FILE_MAX];
-
-    if (view_id == 0) {
-      char path[FILE_MAX];
-      BLI_join_dirfile(path, sizeof(path), seq->strip->dir, seq->strip->stripdata->name);
-      BLI_path_abs(path, BKE_main_blendfile_path_from_global());
-      BKE_scene_multiview_view_prefix_get(scene, path, prefix, &ext);
-    }
-    else {
-      prefix[0] = '\0';
-    }
-
-    if (prefix[0] == '\0') {
-      return view_id != 0;
-    }
-
-    seq_multiview_name(scene, view_id, prefix, ext, str, FILE_MAX);
-
-    if (BLI_access(str, R_OK) == 0) {
-      return false;
-    }
-
-    return view_id != 0;
-  }
-  return false;
-}
-
-/**
- * This returns the maximum possible number of required contexts
- */
-static int seq_proxy_context_count(Sequence *seq, Scene *scene)
-{
-  int num_views = 1;
-
-  if ((scene->r.scemode & R_MULTIVIEW) == 0) {
-    return 1;
-  }
-
-  switch (seq->type) {
-    case SEQ_TYPE_MOVIE: {
-      num_views = BLI_listbase_count(&seq->anims);
-      break;
-    }
-    case SEQ_TYPE_IMAGE: {
-      switch (seq->views_format) {
-        case R_IMF_VIEWS_INDIVIDUAL:
-          num_views = BKE_scene_multiview_num_views_get(&scene->r);
-          break;
-        case R_IMF_VIEWS_STEREO_3D:
-          num_views = 2;
-          break;
-        case R_IMF_VIEWS_MULTIVIEW:
-          /* not supported at the moment */
-          /* pass through */
-        default:
-          num_views = 1;
-      }
-      break;
-    }
-  }
-
-  return num_views;
-}
-
-bool BKE_sequencer_proxy_rebuild_context(Main *bmain,
-                                         Depsgraph *depsgraph,
-                                         Scene *scene,
-                                         Sequence *seq,
-                                         struct GSet *file_list,
-                                         ListBase *queue)
-{
-  SeqIndexBuildContext *context;
-  Sequence *nseq;
-  LinkData *link;
-  int num_files;
-  int i;
-
-  if (!seq->strip || !seq->strip->proxy) {
-    return true;
-  }
-
-  if (!(seq->flag & SEQ_USE_PROXY)) {
-    return true;
-  }
-
-  num_files = seq_proxy_context_count(seq, scene);
-
-  for (i = 0; i < num_files; i++) {
-    if (seq_proxy_multiview_context_invalid(seq, scene, i)) {
-      continue;
-    }
-
-    context = MEM_callocN(sizeof(SeqIndexBuildContext), "seq proxy rebuild context");
-
-    nseq = BKE_sequence_dupli_recursive(scene, scene, NULL, seq, 0);
-
-    context->tc_flags = nseq->strip->proxy->build_tc_flags;
-    context->size_flags = nseq->strip->proxy->build_size_flags;
-    context->quality = nseq->strip->proxy->quality;
-    context->overwrite = (nseq->strip->proxy->build_flags & SEQ_PROXY_SKIP_EXISTING) == 0;
-
-    context->bmain = bmain;
-    context->depsgraph = depsgraph;
-    context->scene = scene;
-    context->orig_seq = seq;
-    context->seq = nseq;
-
-    context->view_id = i; /* only for images */
-
-    if (nseq->type == SEQ_TYPE_MOVIE) {
-      StripAnim *sanim;
-
-      seq_open_anim_file(scene, nseq, true);
-      sanim = BLI_findlink(&nseq->anims, i);
-
-      if (sanim->anim) {
-        context->index_context = IMB_anim_index_rebuild_context(sanim->anim,
-                                                                context->tc_flags,
-                                                                context->size_flags,
-                                                                context->quality,
-                                                                context->overwrite,
-                                                                file_list);
-      }
-      if (!context->index_context) {
-        MEM_freeN(context);
-        return false;
-      }
-    }
-
-    link = BLI_genericNodeN(context);
-    BLI_addtail(queue, link);
-  }
-  return true;
-}
-
-void BKE_sequencer_proxy_rebuild(SeqIndexBuildContext *context,
-                                 short *stop,
-                                 short *do_update,
-                                 float *progress)
-{
-  const bool overwrite = context->overwrite;
-  SeqRenderData render_context;
-  Sequence *seq = context->seq;
-  Scene *scene = context->scene;
-  Main *bmain = context->bmain;
-  int cfra;
-
-  if (seq->type == SEQ_TYPE_MOVIE) {
-    if (context->index_context) {
-      IMB_anim_index_rebuild(context->index_context, stop, do_update, progress);
-    }
-
-    return;
-  }
-
-  if (!(seq->flag & SEQ_USE_PROXY)) {
-    return;
-  }
-
-  /* that's why it is called custom... */
-  if (seq->strip->proxy && seq->strip->proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_FILE) {
-    return;
-  }
-
-  /* fail safe code */
-
-  BKE_sequencer_new_render_data(bmain,
-                                context->depsgraph,
-                                context->scene,
-                                roundf((scene->r.size * (float)scene->r.xsch) / 100.0f),
-                                roundf((scene->r.size * (float)scene->r.ysch) / 100.0f),
-                                100,
-                                false,
-                                &render_context);
-
-  render_context.skip_cache = true;
-  render_context.is_proxy_render = true;
-  render_context.view_id = context->view_id;
-
-  SeqRenderState state;
-  sequencer_state_init(&state);
-
-  for (cfra = seq->startdisp + seq->startstill; cfra < seq->enddisp - seq->endstill; cfra++) {
-    if (context->size_flags & IMB_PROXY_25) {
-      seq_proxy_build_frame(&render_context, &state, seq, cfra, 25, overwrite);
-    }
-    if (context->size_flags & IMB_PROXY_50) {
-      seq_proxy_build_frame(&render_context, &state, seq, cfra, 50, overwrite);
-    }
-    if (context->size_flags & IMB_PROXY_75) {
-      seq_proxy_build_frame(&render_context, &state, seq, cfra, 75, overwrite);
-    }
-    if (context->size_flags & IMB_PROXY_100) {
-      seq_proxy_build_frame(&render_context, &state, seq, cfra, 100, overwrite);
-    }
-
-    *progress = (float)(cfra - seq->startdisp - seq->startstill) /
-                (seq->enddisp - seq->endstill - seq->startdisp - seq->startstill);
-    *do_update = true;
-
-    if (*stop || G.is_break) {
-      break;
-    }
-  }
-}
-
-void BKE_sequencer_proxy_rebuild_finish(SeqIndexBuildContext *context, bool stop)
-{
-  if (context->index_context) {
-    StripAnim *sanim;
-
-    for (sanim = context->seq->anims.first; sanim; sanim = sanim->next) {
-      IMB_close_anim_proxies(sanim->anim);
-    }
-
-    for (sanim = context->orig_seq->anims.first; sanim; sanim = sanim->next) {
-      IMB_close_anim_proxies(sanim->anim);
-    }
-
-    IMB_anim_index_rebuild_finish(context->index_context, stop);
-  }
-
-  seq_free_sequence_recurse(NULL, context->seq, true);
-
-  MEM_freeN(context);
-}
-
-void BKE_sequencer_proxy_set(struct Sequence *seq, bool value)
-{
-  if (value) {
-    seq->flag |= SEQ_USE_PROXY;
-    if (seq->strip->proxy == NULL) {
-      seq->strip->proxy = MEM_callocN(sizeof(struct StripProxy), "StripProxy");
-      seq->strip->proxy->quality = 90;
-      seq->strip->proxy->build_tc_flags = SEQ_PROXY_TC_ALL;
-      seq->strip->proxy->build_size_flags = SEQ_PROXY_IMAGE_SIZE_25;
-    }
-  }
-  else {
-    seq->flag &= ~SEQ_USE_PROXY;
-  }
-}
-
-/*********************** color balance *************************/
-
-static StripColorBalance calc_cb(StripColorBalance *cb_)
-{
-  StripColorBalance cb = *cb_;
-  int c;
-
-  for (c = 0; c < 3; c++) {
-    cb.lift[c] = 2.0f - cb.lift[c];
-  }
-
-  if (cb.flag & SEQ_COLOR_BALANCE_INVERSE_LIFT) {
-    for (c = 0; c < 3; c++) {
-      /* tweak to give more subtle results
-       * values above 1.0 are scaled */
-      if (cb.lift[c] > 1.0f) {
-        cb.lift[c] = pow(cb.lift[c] - 1.0f, 2.0) + 1.0;
-      }
-
-      cb.lift[c] = 2.0f - cb.lift[c];
-    }
-  }
-
-  if (cb.flag & SEQ_COLOR_BALANCE_INVERSE_GAIN) {
-    for (c = 0; c < 3; c++) {
-      if (cb.gain[c] != 0.0f) {
-        cb.gain[c] = 1.0f / cb.gain[c];
-      }
-      else {
-        cb.gain[c] = 1000000; /* should be enough :) */
-      }
-    }
-  }
-
-  if (!(cb.flag & SEQ_COLOR_BALANCE_INVERSE_GAMMA)) {
-    for (c = 0; c < 3; c++) {
-      if (cb.gamma[c] != 0.0f) {
-        cb.gamma[c] = 1.0f / cb.gamma[c];
-      }
-      else {
-        cb.gamma[c] = 1000000; /* should be enough :) */
-      }
-    }
-  }
-
-  return cb;
-}
-
-/* note: lift is actually 2-lift */
-MINLINE float color_balance_fl(
-    float in, const float lift, const float gain, const float gamma, const float mul)
-{
-  float x = (((in - 1.0f) * lift) + 1.0f) * gain;
-
-  /* prevent NaN */
-  if (x < 0.f) {
-    x = 0.f;
-  }
-
-  x = powf(x, gamma) * mul;
-  CLAMP(x, FLT_MIN, FLT_MAX);
-  return x;
-}
-
-static void make_cb_table_float(float lift, float gain, float gamma, float *table, float mul)
-{
-  int y;
-
-  for (y = 0; y < 256; y++) {
-    float v = color_balance_fl((float)y * (1.0f / 255.0f), lift, gain, gamma, mul);
-
-    table[y] = v;
-  }
-}
-
-static void color_balance_byte_byte(StripColorBalance *cb_,
-                                    unsigned char *rect,
-                                    unsigned char *mask_rect,
-                                    int width,
-                                    int height,
-                                    float mul)
-{
-  // unsigned char cb_tab[3][256];
-  unsigned char *cp = rect;
-  unsigned char *e = cp + width * 4 * height;
-  unsigned char *m = mask_rect;
-
-  StripColorBalance cb = calc_cb(cb_);
-
-  while (cp < e) {
-    float p[4];
-    int c;
-
-    straight_uchar_to_premul_float(p, cp);
-
-    for (c = 0; c < 3; c++) {
-      float t = color_balance_fl(p[c], cb.lift[c], cb.gain[c], cb.gamma[c], mul);
-
-      if (m) {
-        float m_normal = (float)m[c] / 255.0f;
-
-        p[c] = p[c] * (1.0f - m_normal) + t * m_normal;
-      }
-      else {
-        p[c] = t;
-      }
-    }
-
-    premul_float_to_straight_uchar(cp, p);
-
-    cp += 4;
-    if (m) {
-      m += 4;
-    }
-  }
-}
-
-static void color_balance_byte_float(StripColorBalance *cb_,
-                                     unsigned char *rect,
-                                     float *rect_float,
-                                     unsigned char *mask_rect,
-                                     int width,
-                                     int height,
-                                     float mul)
-{
-  float cb_tab[4][256];
-  int c, i;
-  unsigned char *p = rect;
-  unsigned char *e = p + width * 4 * height;
-  unsigned char *m = mask_rect;
-  float *o;
-  StripColorBalance cb;
-
-  o = rect_float;
-
-  cb = calc_cb(cb_);
-
-  for (c = 0; c < 3; c++) {
-    make_cb_table_float(cb.lift[c], cb.gain[c], cb.gamma[c], cb_tab[c], mul);
-  }
-
-  for (i = 0; i < 256; i++) {
-    cb_tab[3][i] = ((float)i) * (1.0f / 255.0f);
-  }
-
-  while (p < e) {
-    if (m) {
-      const float t[3] = {m[0] / 255.0f, m[1] / 255.0f, m[2] / 255.0f};
-
-      p[0] = p[0] * (1.0f - t[0]) + t[0] * cb_tab[0][p[0]];
-      p[1] = p[1] * (1.0f - t[1]) + t[1] * cb_tab[1][p[1]];
-      p[2] = p[2] * (1.0f - t[2]) + t[2] * cb_tab[2][p[2]];
-
-      m += 4;
-    }
-    else {
-      o[0] = cb_tab[0][p[0]];
-      o[1] = cb_tab[1][p[1]];
-      o[2] = cb_tab[2][p[2]];
-    }
-
-    o[3] = cb_tab[3][p[3]];
-
-    p += 4;
-    o += 4;
-  }
-}
-
-static void color_balance_float_float(StripColorBalance *cb_,
-                                      float *rect_float,
-                                      const float *mask_rect_float,
-                                      int width,
-                                      int height,
-                                      float mul)
-{
-  float *p = rect_float;
-  const float *e = rect_float + width * 4 * height;
-  const float *m = mask_rect_float;
-  StripColorBalance cb = calc_cb(cb_);
-
-  while (p < e) {
-    int c;
-    for (c = 0; c < 3; c++) {
-      float t = color_balance_fl(p[c], cb.lift[c], cb.gain[c], cb.gamma[c], mul);
-
-      if (m) {
-        p[c] = p[c] * (1.0f - m[c]) + t * m[c];
-      }
-      else {
-        p[c] = t;
-      }
-    }
-
-    p += 4;
-    if (m) {
-      m += 4;
-    }
-  }
-}
-
-typedef struct ColorBalanceInitData {
-  StripColorBalance *cb;
-  ImBuf *ibuf;
-  float mul;
-  ImBuf *mask;
-  bool make_float;
-} ColorBalanceInitData;
-
-typedef struct ColorBalanceThread {
-  StripColorBalance *cb;
-  float mul;
-
-  int width, height;
-
-  unsigned char *rect, *mask_rect;
-  float *rect_float, *mask_rect_float;
-
-  bool make_float;
-} ColorBalanceThread;
-
-static void color_balance_init_handle(void *handle_v,
-                                      int start_line,
-                                      int tot_line,
-                                      void *init_data_v)
-{
-  ColorBalanceThread *handle = (ColorBalanceThread *)handle_v;
-  ColorBalanceInitData *init_data = (ColorBalanceInitData *)init_data_v;
-  ImBuf *ibuf = init_data->ibuf;
-  ImBuf *mask = init_data->mask;
-
-  int offset = 4 * start_line * ibuf->x;
-
-  memset(handle, 0, sizeof(ColorBalanceThread));
-
-  handle->cb = init_data->cb;
-  handle->mul = init_data->mul;
-  handle->width = ibuf->x;
-  handle->height = tot_line;
-  handle->make_float = init_data->make_float;
-
-  if (ibuf->rect) {
-    handle->rect = (unsigned char *)ibuf->rect + offset;
-  }
-
-  if (ibuf->rect_float) {
-    handle->rect_float = ibuf->rect_float + offset;
-  }
-
-  if (mask) {
-    if (mask->rect) {
-      handle->mask_rect = (unsigned char *)mask->rect + offset;
-    }
-
-    if (mask->rect_float) {
-      handle->mask_rect_float = mask->rect_float + offset;
-    }
-  }
-  else {
-    handle->mask_rect = NULL;
-    handle->mask_rect_float = NULL;
-  }
-}
-
-static void *color_balance_do_thread(void *thread_data_v)
-{
-  ColorBalanceThread *thread_data = (ColorBalanceThread *)thread_data_v;
-  StripColorBalance *cb = thread_data->cb;
-  int width = thread_data->width, height = thread_data->height;
-  unsigned char *rect = thread_data->rect;
-  unsigned char *mask_rect = thread_data->mask_rect;
-  float *rect_float = thread_data->rect_float;
-  float *mask_rect_float = thread_data->mask_rect_float;
-  float mul = thread_data->mul;
-
-  if (rect_float) {
-    color_balance_float_float(cb, rect_float, mask_rect_float, width, height, mul);
-  }
-  else if (thread_data->make_float) {
-    color_balance_byte_float(cb, rect, rect_float, mask_rect, width, height, mul);
-  }
-  else {
-    color_balance_byte_byte(cb, rect, mask_rect, width, height, mul);
-  }
-
-  return NULL;
-}
-
-/**
- * \a cfra is offset by \a fra_offset only in case we are using a real mask.
- */
-ImBuf *BKE_sequencer_render_mask_input(const SeqRenderData *context,
-                                       int mask_input_type,
-                                       Sequence *mask_sequence,
-                                       Mask *mask_id,
-                                       int cfra,
-                                       int fra_offset,
-                                       bool make_float)
-{
-  ImBuf *mask_input = NULL;
-
-  if (mask_input_type == SEQUENCE_MASK_INPUT_STRIP) {
-    if (mask_sequence) {
-      SeqRenderState state;
-      sequencer_state_init(&state);
-
-      mask_input = seq_render_strip(context, &state, mask_sequence, cfra);
-
-      if (make_float) {
-        if (!mask_input->rect_float) {
-          IMB_float_from_rect(mask_input);
-        }
-      }
-      else {
-        if (!mask_input->rect) {
-          IMB_rect_from_float(mask_input);
-        }
-      }
-    }
-  }
-  else if (mask_input_type == SEQUENCE_MASK_INPUT_ID) {
-    mask_input = seq_render_mask(context, mask_id, cfra - fra_offset, make_float);
-  }
-
-  return mask_input;
-}
-
-void BKE_sequencer_color_balance_apply(
-    StripColorBalance *cb, ImBuf *ibuf, float mul, bool make_float, ImBuf *mask_input)
-{
-  ColorBalanceInitData init_data;
-
-  if (!ibuf->rect_float && make_float) {
-    imb_addrectfloatImBuf(ibuf);
-  }
-
-  init_data.cb = cb;
-  init_data.ibuf = ibuf;
-  init_data.mul = mul;
-  init_data.make_float = make_float;
-  init_data.mask = mask_input;
-
-  IMB_processor_apply_threaded(ibuf->y,
-                               sizeof(ColorBalanceThread),
-                               &init_data,
-                               color_balance_init_handle,
-                               color_balance_do_thread);
-
-  /* color balance either happens on float buffer or byte buffer, but never on both,
-   * free byte buffer if there's float buffer since float buffer would be used for
-   * color balance in favor of byte buffer
-   */
-  if (ibuf->rect_float && ibuf->rect) {
-    imb_freerectImBuf(ibuf);
-  }
-}
-
-/*
- * input preprocessing for SEQ_TYPE_IMAGE, SEQ_TYPE_MOVIE, SEQ_TYPE_MOVIECLIP and SEQ_TYPE_SCENE
- *
- * Do all the things you can't really do afterwards using sequence effects
- * (read: before rescaling to render resolution has been done)
- *
- * Order is important!
- *
- * - Deinterlace
- * - Crop and transform in image source coordinate space
- * - Flip X + Flip Y (could be done afterwards, backward compatibility)
- * - Promote image to float data (affects pipeline operations afterwards)
- * - Color balance (is most efficient in the byte -> float
- *   (future: half -> float should also work fine!)
- *   case, if done on load, since we can use lookup tables)
- * - Premultiply
- */
-
-bool BKE_sequencer_input_have_to_preprocess(const SeqRenderData *context,
-                                            Sequence *seq,
-                                            float UNUSED(cfra))
-{
-  float mul;
-
-  if (context && context->is_proxy_render) {
-    return false;
-  }
-
-  if (seq->flag &
-      (SEQ_FILTERY | SEQ_USE_CROP | SEQ_USE_TRANSFORM | SEQ_FLIPX | SEQ_FLIPY | SEQ_MAKE_FLOAT)) {
-    return true;
-  }
-
-  mul = seq->mul;
-
-  if (seq->blend_mode == SEQ_BLEND_REPLACE) {
-    mul *= seq->blend_opacity / 100.0f;
-  }
-
-  if (mul != 1.0f) {
-    return true;
-  }
-
-  if (seq->sat != 1.0f) {
-    return true;
-  }
-
-  if (seq->modifiers.first) {
-    return true;
-  }
-
-  return false;
-}
-
-static ImBuf *input_preprocess(const SeqRenderData *context,
-                               Sequence *seq,
-                               float cfra,
-                               ImBuf *ibuf,
-                               const bool is_proxy_image)
-{
-  Scene *scene = context->scene;
-  float mul;
-
-  ibuf = IMB_makeSingleUser(ibuf);
-
-  if ((seq->flag & SEQ_FILTERY) && !ELEM(seq->type, SEQ_TYPE_MOVIE, SEQ_TYPE_MOVIECLIP)) {
-    IMB_filtery(ibuf);
-  }
-
-  if (seq->flag & (SEQ_USE_CROP | SEQ_USE_TRANSFORM)) {
-    StripCrop c = {0};
-    StripTransform t = {0};
-
-    if (seq->flag & SEQ_USE_CROP && seq->strip->crop) {
-      c = *seq->strip->crop;
-    }
-    if (seq->flag & SEQ_USE_TRANSFORM && seq->strip->transform) {
-      t = *seq->strip->transform;
-    }
-
-    /* Calculate scale factor for current image if needed. */
-    double scale_factor, image_scale_factor = 1.0;
-    if (context->preview_render_size == SEQ_RENDER_SIZE_SCENE) {
-      scale_factor = image_scale_factor = (double)scene->r.size / 100;
-    }
-    else {
-      scale_factor = BKE_sequencer_rendersize_to_scale_factor(context->preview_render_size);
-      if (!is_proxy_image) {
-        image_scale_factor = scale_factor;
-      }
-    }
-
-    if (image_scale_factor != 1.0) {
-      if (context->for_render) {
-        IMB_scaleImBuf(ibuf, ibuf->x * image_scale_factor, ibuf->y * image_scale_factor);
-      }
-      else {
-        IMB_scalefastImBuf(ibuf, ibuf->x * image_scale_factor, ibuf->y * image_scale_factor);
-      }
-    }
-
-    t.xofs *= scale_factor;
-    t.yofs *= scale_factor;
-    c.left *= scale_factor;
-    c.right *= scale_factor;
-    c.top *= scale_factor;
-    c.bottom *= scale_factor;
-
-    int sx, sy, dx, dy;
-    sx = ibuf->x - c.left - c.right;
-    sy = ibuf->y - c.top - c.bottom;
-
-    if (seq->flag & SEQ_USE_TRANSFORM) {
-      dx = context->rectx;
-      dy = context->recty;
-    }
-    else {
-      dx = sx;
-      dy = sy;
-    }
-
-    if (c.top + c.bottom >= ibuf->y || c.left + c.right >= ibuf->x || t.xofs >= dx ||
-        t.yofs >= dy) {
-      return NULL;
-    }
-
-    ImBuf *i = IMB_allocImBuf(dx, dy, 32, ibuf->rect_float ? IB_rectfloat : IB_rect);
-    IMB_rectcpy(i, ibuf, t.xofs, t.yofs, c.left, c.bottom, sx, sy);
-    sequencer_imbuf_assign_spaces(scene, i);
-    IMB_metadata_copy(i, ibuf);
-    IMB_freeImBuf(ibuf);
-    ibuf = i;
-  }
-
-  if (seq->flag & SEQ_FLIPX) {
-    IMB_flipx(ibuf);
-  }
-
-  if (seq->flag & SEQ_FLIPY) {
-    IMB_flipy(ibuf);
-  }
-
-  if (seq->sat != 1.0f) {
-    IMB_saturation(ibuf, seq->sat);
-  }
-
-  mul = seq->mul;
-
-  if (seq->blend_mode == SEQ_BLEND_REPLACE) {
-    mul *= seq->blend_opacity / 100.0f;
-  }
-
-  if (seq->flag & SEQ_MAKE_FLOAT) {
-    if (!ibuf->rect_float) {
-      BKE_sequencer_imbuf_to_sequencer_space(scene, ibuf, true);
-    }
-
-    if (ibuf->rect) {
-      imb_freerectImBuf(ibuf);
-    }
-  }
-
-  if (mul != 1.0f) {
-    multibuf(ibuf, mul);
-  }
-
-  if (ibuf->x != context->rectx || ibuf->y != context->recty) {
-    if (context->for_render) {
-      IMB_scaleImBuf(ibuf, (short)context->rectx, (short)context->recty);
-    }
-    else {
-      IMB_scalefastImBuf(ibuf, (short)context->rectx, (short)context->recty);
-    }
-  }
-
-  if (seq->modifiers.first) {
-    ImBuf *ibuf_new = BKE_sequence_modifier_apply_stack(context, seq, ibuf, cfra);
-
-    if (ibuf_new != ibuf) {
-      IMB_metadata_copy(ibuf_new, ibuf);
-      IMB_freeImBuf(ibuf);
-      ibuf = ibuf_new;
-    }
-  }
-
-  return ibuf;
-}
-
-/*********************** strip rendering functions  *************************/
-
-typedef struct RenderEffectInitData {
-  struct SeqEffectHandle *sh;
-  const SeqRenderData *context;
-  Sequence *seq;
-  float cfra, facf0, facf1;
-  ImBuf *ibuf1, *ibuf2, *ibuf3;
-
-  ImBuf *out;
-} RenderEffectInitData;
-
-typedef struct RenderEffectThread {
-  struct SeqEffectHandle *sh;
-  const SeqRenderData *context;
-  Sequence *seq;
-  float cfra, facf0, facf1;
-  ImBuf *ibuf1, *ibuf2, *ibuf3;
-
-  ImBuf *out;
-  int start_line, tot_line;
-} RenderEffectThread;
-
-static void render_effect_execute_init_handle(void *handle_v,
-                                              int start_line,
-                                              int tot_line,
-                                              void *init_data_v)
-{
-  RenderEffectThread *handle = (RenderEffectThread *)handle_v;
-  RenderEffectInitData *init_data = (RenderEffectInitData *)init_data_v;
-
-  handle->sh = init_data->sh;
-  handle->context = init_data->context;
-  handle->seq = init_data->seq;
-  handle->cfra = init_data->cfra;
-  handle->facf0 = init_data->facf0;
-  handle->facf1 = init_data->facf1;
-  handle->ibuf1 = init_data->ibuf1;
-  handle->ibuf2 = init_data->ibuf2;
-  handle->ibuf3 = init_data->ibuf3;
-  handle->out = init_data->out;
-
-  handle->start_line = start_line;
-  handle->tot_line = tot_line;
-}
-
-static void *render_effect_execute_do_thread(void *thread_data_v)
-{
-  RenderEffectThread *thread_data = (RenderEffectThread *)thread_data_v;
-
-  thread_data->sh->execute_slice(thread_data->context,
-                                 thread_data->seq,
-                                 thread_data->cfra,
-                                 thread_data->facf0,
-                                 thread_data->facf1,
-                                 thread_data->ibuf1,
-                                 thread_data->ibuf2,
-                                 thread_data->ibuf3,
-                                 thread_data->start_line,
-                                 thread_data->tot_line,
-                                 thread_data->out);
-
-  return NULL;
-}
-
-ImBuf *BKE_sequencer_effect_execute_threaded(struct SeqEffectHandle *sh,
-                                             const SeqRenderData *context,
-                                             Sequence *seq,
-                                             float cfra,
-                                             float facf0,
-                                             float facf1,
-                                             ImBuf *ibuf1,
-                                             ImBuf *ibuf2,
-                                             ImBuf *ibuf3)
-{
-  RenderEffectInitData init_data;
-  ImBuf *out = sh->init_execution(context, ibuf1, ibuf2, ibuf3);
-
-  init_data.sh = sh;
-  init_data.context = context;
-  init_data.seq = seq;
-  init_data.cfra = cfra;
-  init_data.facf0 = facf0;
-  init_data.facf1 = facf1;
-  init_data.ibuf1 = ibuf1;
-  init_data.ibuf2 = ibuf2;
-  init_data.ibuf3 = ibuf3;
-  init_data.out = out;
-
-  IMB_processor_apply_threaded(out->y,
-                               sizeof(RenderEffectThread),
-                               &init_data,
-                               render_effect_execute_init_handle,
-                               render_effect_execute_do_thread);
-
-  return out;
-}
-
-static ImBuf *seq_render_effect_strip_impl(const SeqRenderData *context,
-                                           SeqRenderState *state,
-                                           Sequence *seq,
-                                           float cfra)
-{
-  Scene *scene = context->scene;
-  float fac, facf;
-  int early_out;
-  int i;
-  struct SeqEffectHandle sh = BKE_sequence_get_effect(seq);
-  FCurve *fcu = NULL;
-  ImBuf *ibuf[3];
-  Sequence *input[3];
-  ImBuf *out = NULL;
-
-  ibuf[0] = ibuf[1] = ibuf[2] = NULL;
-
-  input[0] = seq->seq1;
-  input[1] = seq->seq2;
-  input[2] = seq->seq3;
-
-  if (!sh.execute && !(sh.execute_slice && sh.init_execution)) {
-    /* effect not supported in this version... */
-    out = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-    return out;
-  }
-
-  if (seq->flag & SEQ_USE_EFFECT_DEFAULT_FADE) {
-    sh.get_default_fac(seq, cfra, &fac, &facf);
-    facf = fac;
-  }
-  else {
-    fcu = id_data_find_fcurve(&scene->id, seq, &RNA_Sequence, "effect_fader", 0, NULL);
-    if (fcu) {
-      fac = facf = evaluate_fcurve(fcu, cfra);
-    }
-    else {
-      fac = facf = seq->effect_fader;
-    }
-  }
-
-  early_out = sh.early_out(seq, fac, facf);
-
-  switch (early_out) {
-    case EARLY_NO_INPUT:
-      out = sh.execute(context, seq, cfra, fac, facf, NULL, NULL, NULL);
-      break;
-    case EARLY_DO_EFFECT:
-      for (i = 0; i < 3; i++) {
-        /* Speed effect requires time remapping of `cfra` for input(s). */
-        if (input[0] && seq->type == SEQ_TYPE_SPEED) {
-          float target_frame = BKE_sequencer_speed_effect_target_frame_get(context, seq, cfra, i);
-          ibuf[i] = seq_render_strip(context, state, input[0], target_frame);
-        }
-        else { /* Other effects. */
-          if (input[i]) {
-            ibuf[i] = seq_render_strip(context, state, input[i], cfra);
-          }
-        }
-      }
-
-      if (ibuf[0] && (ibuf[1] || BKE_sequence_effect_get_num_inputs(seq->type) == 1)) {
-        if (sh.multithreaded) {
-          out = BKE_sequencer_effect_execute_threaded(
-              &sh, context, seq, cfra, fac, facf, ibuf[0], ibuf[1], ibuf[2]);
-        }
-        else {
-          out = sh.execute(context, seq, cfra, fac, facf, ibuf[0], ibuf[1], ibuf[2]);
-        }
-      }
-      break;
-    case EARLY_USE_INPUT_1:
-      if (input[0]) {
-        out = seq_render_strip(context, state, input[0], cfra);
-      }
-      break;
-    case EARLY_USE_INPUT_2:
-      if (input[1]) {
-        out = seq_render_strip(context, state, input[1], cfra);
-      }
-      break;
-  }
-
-  for (i = 0; i < 3; i++) {
-    IMB_freeImBuf(ibuf[i]);
-  }
-
-  if (out == NULL) {
-    out = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-  }
-
-  return out;
-}
-
-/**
- * Render individual view for multi-view or single (default view) for mono-view.
- */
-static ImBuf *seq_render_image_strip_view(const SeqRenderData *context,
-                                          Sequence *seq,
-                                          char *name,
-                                          char *prefix,
-                                          const char *ext,
-                                          int view_id)
-{
-
-  ImBuf *ibuf = NULL;
-
-  int flag = IB_rect | IB_metadata;
-  if (seq->alpha_mode == SEQ_ALPHA_PREMUL) {
-    flag |= IB_alphamode_premul;
-  }
-
-  if (prefix[0] == '\0') {
-    ibuf = IMB_loadiffname(name, flag, seq->strip->colorspace_settings.name);
-  }
-  else {
-    char str[FILE_MAX];
-    BKE_scene_multiview_view_prefix_get(context->scene, name, prefix, &ext);
-    seq_multiview_name(context->scene, view_id, prefix, ext, str, FILE_MAX);
-    ibuf = IMB_loadiffname(str, flag, seq->strip->colorspace_settings.name);
-  }
-
-  if (ibuf == NULL) {
-    return NULL;
-  }
-
-  /* We don't need both (speed reasons)! */
-  if (ibuf->rect_float != NULL && ibuf->rect != NULL) {
-    imb_freerectImBuf(ibuf);
-  }
-
-  /* All sequencer color is done in SRGB space, linear gives odd cross-fades. */
-  BKE_sequencer_imbuf_to_sequencer_space(context->scene, ibuf, false);
-
-  return ibuf;
-}
-
-static bool seq_image_strip_is_multiview_render(
-    Scene *scene, Sequence *seq, int totfiles, char *name, char *r_prefix, const char *r_ext)
-{
-  if (totfiles > 1) {
-    BKE_scene_multiview_view_prefix_get(scene, name, r_prefix, &r_ext);
-    if (r_prefix[0] == '\0') {
-      return false;
-    }
-  }
-  else {
-    r_prefix[0] = '\0';
-  }
-
-  return (seq->flag & SEQ_USE_VIEWS) != 0 && (scene->r.scemode & R_MULTIVIEW) != 0;
-}
-
-static ImBuf *seq_render_image_strip(const SeqRenderData *context,
-                                     Sequence *seq,
-                                     float UNUSED(nr),
-                                     float cfra,
-                                     bool *r_is_proxy_image)
-{
-  char name[FILE_MAX];
-  const char *ext = NULL;
-  char prefix[FILE_MAX];
-  ImBuf *ibuf = NULL;
-
-  StripElem *s_elem = BKE_sequencer_give_stripelem(seq, cfra);
-  if (s_elem == NULL) {
-    return NULL;
-  }
-
-  BLI_join_dirfile(name, sizeof(name), seq->strip->dir, s_elem->name);
-  BLI_path_abs(name, BKE_main_blendfile_path_from_global());
-
-  /* Try to get a proxy image. */
-  ibuf = seq_proxy_fetch(context, seq, cfra);
-  if (ibuf != NULL) {
-    s_elem->orig_width = ibuf->x;
-    s_elem->orig_height = ibuf->y;
-    *r_is_proxy_image = true;
-    return ibuf;
-  }
-
-  /* Proxy not found, render original. */
-  const int totfiles = seq_num_files(context->scene, seq->views_format, true);
-  bool is_multiview_render = seq_image_strip_is_multiview_render(
-      context->scene, seq, totfiles, name, prefix, ext);
-
-  if (is_multiview_render) {
-    int totviews = BKE_scene_multiview_num_views_get(&context->scene->r);
-    ImBuf **ibufs_arr = MEM_callocN(sizeof(ImBuf *) * totviews, "Sequence Image Views Imbufs");
-
-    for (int view_id = 0; view_id < totfiles; view_id++) {
-      ibufs_arr[view_id] = seq_render_image_strip_view(context, seq, name, prefix, ext, view_id);
-    }
-
-    if (ibufs_arr[0] == NULL) {
-      return NULL;
-    }
-
-    if (seq->views_format == R_IMF_VIEWS_STEREO_3D) {
-      IMB_ImBufFromStereo3d(seq->stereo3d_format, ibufs_arr[0], &ibufs_arr[0], &ibufs_arr[1]);
-    }
-
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      SeqRenderData localcontext = *context;
-      localcontext.view_id = view_id;
-
-      if (view_id != context->view_id) {
-        ibufs_arr[view_id] = seq_render_preprocess_ibuf(
-            &localcontext, seq, ibufs_arr[view_id], cfra, clock(), true, false);
-      }
-    }
-
-    /* Return the original requested ImBuf. */
-    ibuf = ibufs_arr[context->view_id];
-
-    /* Remove the others (decrease their refcount). */
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      if (ibufs_arr[view_id] != ibuf) {
-        IMB_freeImBuf(ibufs_arr[view_id]);
-      }
-    }
-
-    MEM_freeN(ibufs_arr);
-  }
-  else {
-    ibuf = seq_render_image_strip_view(context, seq, name, prefix, ext, context->view_id);
-  }
-
-  if (ibuf == NULL) {
-    return NULL;
-  }
-
-  s_elem->orig_width = ibuf->x;
-  s_elem->orig_height = ibuf->y;
-
-  return ibuf;
-}
-
-static ImBuf *seq_render_movie_strip_custom_file_proxy(const SeqRenderData *context,
-                                                       Sequence *seq,
-                                                       int cfra)
-{
-  char name[PROXY_MAXFILE];
-  StripProxy *proxy = seq->strip->proxy;
-
-  if (proxy->anim == NULL) {
-    if (seq_proxy_get_custom_file_fname(seq, name, context->view_id)) {
-      proxy->anim = openanim(name, IB_rect, 0, seq->strip->colorspace_settings.name);
-    }
-    if (proxy->anim == NULL) {
-      return NULL;
-    }
-  }
-
-  int frameno = (int)BKE_sequencer_give_stripelem_index(seq, cfra) + seq->anim_startofs;
-  return IMB_anim_absolute(proxy->anim, frameno, IMB_TC_NONE, IMB_PROXY_NONE);
-}
-
-/**
- * Render individual view for multi-view or single (default view) for mono-view.
- */
-static ImBuf *seq_render_movie_strip_view(const SeqRenderData *context,
-                                          Sequence *seq,
-                                          float nr,
-                                          float cfra,
-                                          StripAnim *sanim,
-                                          bool *r_is_proxy_image)
-{
-  ImBuf *ibuf = NULL;
-  IMB_Proxy_Size psize = seq_rendersize_to_proxysize(context->preview_render_size);
-
-  IMB_anim_set_preseek(sanim->anim, seq->anim_preseek);
-
-  if (seq_can_use_proxy(seq, psize)) {
-    /* Try to get a proxy image.
-     * Movie proxies are handled by ImBuf module with exception of `custom file` setting. */
-    if (context->scene->ed->proxy_storage != SEQ_EDIT_PROXY_DIR_STORAGE &&
-        seq->strip->proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_FILE) {
-      ibuf = seq_render_movie_strip_custom_file_proxy(context, seq, cfra);
-    }
-    else {
-      ibuf = IMB_anim_absolute(sanim->anim,
-                               nr + seq->anim_startofs,
-                               seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
-                               psize);
-    }
-
-    if (ibuf != NULL) {
-      *r_is_proxy_image = true;
-    }
-  }
-
-  /* Fetching for requested proxy size failed, try fetching the original instead. */
-  if (ibuf == NULL) {
-    ibuf = IMB_anim_absolute(sanim->anim,
-                             nr + seq->anim_startofs,
-                             seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
-                             IMB_PROXY_NONE);
-  }
-  if (ibuf == NULL) {
-    return NULL;
-  }
-
-  BKE_sequencer_imbuf_to_sequencer_space(context->scene, ibuf, false);
-
-  /* We don't need both (speed reasons)! */
-  if (ibuf->rect_float != NULL && ibuf->rect != NULL) {
-    imb_freerectImBuf(ibuf);
-  }
-
-  return ibuf;
-}
-
-static ImBuf *seq_render_movie_strip(
-    const SeqRenderData *context, Sequence *seq, float nr, float cfra, bool *r_is_proxy_image)
-{
-  /* Load all the videos. */
-  seq_open_anim_file(context->scene, seq, false);
-
-  ImBuf *ibuf = NULL;
-  StripAnim *sanim = seq->anims.first;
-  const int totfiles = seq_num_files(context->scene, seq->views_format, true);
-  bool is_multiview_render = (seq->flag & SEQ_USE_VIEWS) != 0 &&
-                             (context->scene->r.scemode & R_MULTIVIEW) != 0 &&
-                             BLI_listbase_count_at_most(&seq->anims, totfiles + 1) == totfiles;
-
-  if (is_multiview_render) {
-    ImBuf **ibuf_arr;
-    int totviews = BKE_scene_multiview_num_views_get(&context->scene->r);
-    ibuf_arr = MEM_callocN(sizeof(ImBuf *) * totviews, "Sequence Image Views Imbufs");
-    int ibuf_view_id;
-
-    for (ibuf_view_id = 0, sanim = seq->anims.first; sanim; sanim = sanim->next, ibuf_view_id++) {
-      if (sanim->anim) {
-        ibuf_arr[ibuf_view_id] = seq_render_movie_strip_view(
-            context, seq, nr, cfra, sanim, r_is_proxy_image);
-      }
-    }
-
-    if (seq->views_format == R_IMF_VIEWS_STEREO_3D) {
-      if (ibuf_arr[0] == NULL) {
-        /* Probably proxy hasn't been created yet. */
-        MEM_freeN(ibuf_arr);
-        return NULL;
-      }
-
-      IMB_ImBufFromStereo3d(seq->stereo3d_format, ibuf_arr[0], &ibuf_arr[0], &ibuf_arr[1]);
-    }
-
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      SeqRenderData localcontext = *context;
-      localcontext.view_id = view_id;
-
-      if (view_id != context->view_id) {
-        ibuf_arr[view_id] = seq_render_preprocess_ibuf(
-            &localcontext, seq, ibuf_arr[view_id], cfra, clock(), true, false);
-      }
-    }
-
-    /* Return the original requested ImBuf. */
-    ibuf = ibuf_arr[context->view_id];
-
-    /* Remove the others (decrease their refcount). */
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      if (ibuf_arr[view_id] != ibuf) {
-        IMB_freeImBuf(ibuf_arr[view_id]);
-      }
-    }
-
-    MEM_freeN(ibuf_arr);
-  }
-  else {
-    ibuf = seq_render_movie_strip_view(context, seq, nr, cfra, sanim, r_is_proxy_image);
-  }
-
-  if (ibuf == NULL) {
-    return NULL;
-  }
-
-  seq->strip->stripdata->orig_width = ibuf->x;
-  seq->strip->stripdata->orig_height = ibuf->y;
-
-  return ibuf;
-}
-
-static ImBuf *seq_get_movieclip_ibuf(Sequence *seq, MovieClipUser user)
-{
-  ImBuf *ibuf = NULL;
-  float tloc[2], tscale, tangle;
-  if (seq->clip_flag & SEQ_MOVIECLIP_RENDER_STABILIZED) {
-    ibuf = BKE_movieclip_get_stable_ibuf(seq->clip, &user, tloc, &tscale, &tangle, 0);
-  }
-  else {
-    ibuf = BKE_movieclip_get_ibuf_flag(seq->clip, &user, seq->clip->flag, MOVIECLIP_CACHE_SKIP);
-  }
-  return ibuf;
-}
-
-static ImBuf *seq_render_movieclip_strip(const SeqRenderData *context,
-                                         Sequence *seq,
-                                         float nr,
-                                         bool *r_is_proxy_image)
-{
-  ImBuf *ibuf = NULL;
-  MovieClipUser user;
-  IMB_Proxy_Size psize = seq_rendersize_to_proxysize(context->preview_render_size);
-
-  if (!seq->clip) {
-    return NULL;
-  }
-
-  memset(&user, 0, sizeof(MovieClipUser));
-
-  BKE_movieclip_user_set_frame(&user, nr + seq->anim_startofs + seq->clip->start_frame);
-
-  user.render_size = MCLIP_PROXY_RENDER_SIZE_FULL;
-  switch (psize) {
-    case IMB_PROXY_NONE:
-      user.render_size = MCLIP_PROXY_RENDER_SIZE_FULL;
-      break;
-    case IMB_PROXY_100:
-      user.render_size = MCLIP_PROXY_RENDER_SIZE_100;
-      break;
-    case IMB_PROXY_75:
-      user.render_size = MCLIP_PROXY_RENDER_SIZE_75;
-      break;
-    case IMB_PROXY_50:
-      user.render_size = MCLIP_PROXY_RENDER_SIZE_50;
-      break;
-    case IMB_PROXY_25:
-      user.render_size = MCLIP_PROXY_RENDER_SIZE_25;
-      break;
-  }
-
-  if (seq->clip_flag & SEQ_MOVIECLIP_RENDER_UNDISTORTED) {
-    user.render_flag |= MCLIP_PROXY_RENDER_UNDISTORT;
-  }
-
-  /* Try to get a proxy image. */
-  ibuf = seq_get_movieclip_ibuf(seq, user);
-
-  if (ibuf != NULL && psize != IMB_PROXY_NONE) {
-    *r_is_proxy_image = true;
-  }
-
-  /* If proxy is not found, grab full-size frame. */
-  if (ibuf == NULL) {
-    user.render_flag |= MCLIP_PROXY_RENDER_USE_FALLBACK_RENDER;
-    ibuf = seq_get_movieclip_ibuf(seq, user);
-  }
-
-  return ibuf;
-}
-
-static ImBuf *seq_render_mask(const SeqRenderData *context, Mask *mask, float nr, bool make_float)
-{
-  /* TODO - add option to rasterize to alpha imbuf? */
-  ImBuf *ibuf = NULL;
-  float *maskbuf;
-  int i;
-
-  if (!mask) {
-    return NULL;
-  }
-
-  AnimData *adt;
-  Mask *mask_temp;
-  MaskRasterHandle *mr_handle;
-
-  mask_temp = BKE_mask_copy_nolib(mask);
-
-  BKE_mask_evaluate(mask_temp, mask->sfra + nr, true);
-
-  /* anim-data */
-  adt = BKE_animdata_from_id(&mask->id);
-  const AnimationEvalContext anim_eval_context = BKE_animsys_eval_context_construct(
-      context->depsgraph, mask->sfra + nr);
-  BKE_animsys_evaluate_animdata(&mask_temp->id, adt, &anim_eval_context, ADT_RECALC_ANIM, false);
-
-  maskbuf = MEM_mallocN(sizeof(float) * context->rectx * context->recty, __func__);
-
-  mr_handle = BKE_maskrasterize_handle_new();
-
-  BKE_maskrasterize_handle_init(
-      mr_handle, mask_temp, context->rectx, context->recty, true, true, true);
-
-  BKE_mask_free(mask_temp);
-  MEM_freeN(mask_temp);
-
-  BKE_maskrasterize_buffer(mr_handle, context->rectx, context->recty, maskbuf);
-
-  BKE_maskrasterize_handle_free(mr_handle);
-
-  if (make_float) {
-    /* pixels */
-    const float *fp_src;
-    float *fp_dst;
-
-    ibuf = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rectfloat);
-
-    fp_src = maskbuf;
-    fp_dst = ibuf->rect_float;
-    i = context->rectx * context->recty;
-    while (--i) {
-      fp_dst[0] = fp_dst[1] = fp_dst[2] = *fp_src;
-      fp_dst[3] = 1.0f;
-
-      fp_src += 1;
-      fp_dst += 4;
-    }
-  }
-  else {
-    /* pixels */
-    const float *fp_src;
-    unsigned char *ub_dst;
-
-    ibuf = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-
-    fp_src = maskbuf;
-    ub_dst = (unsigned char *)ibuf->rect;
-    i = context->rectx * context->recty;
-    while (--i) {
-      ub_dst[0] = ub_dst[1] = ub_dst[2] = (unsigned char)(*fp_src * 255.0f); /* already clamped */
-      ub_dst[3] = 255;
-
-      fp_src += 1;
-      ub_dst += 4;
-    }
-  }
-
-  MEM_freeN(maskbuf);
-
-  return ibuf;
-}
-
-static ImBuf *seq_render_mask_strip(const SeqRenderData *context, Sequence *seq, float nr)
-{
-  bool make_float = (seq->flag & SEQ_MAKE_FLOAT) != 0;
-
-  return seq_render_mask(context, seq->mask, nr, make_float);
-}
-
-static ImBuf *seq_render_scene_strip(const SeqRenderData *context,
-                                     Sequence *seq,
-                                     float nr,
-                                     float cfra)
-{
-  ImBuf *ibuf = NULL;
-  double frame;
-  Object *camera;
-
-  struct {
-    int scemode;
-    int cfra;
-    float subframe;
-
-#ifdef DURIAN_CAMERA_SWITCH
-    int mode;
-#endif
-  } orig_data;
-
-  /* Old info:
-   * Hack! This function can be called from do_render_seq(), in that case
-   * the seq->scene can already have a Render initialized with same name,
-   * so we have to use a default name. (compositor uses scene name to
-   * find render).
-   * However, when called from within the UI (image preview in sequencer)
-   * we do want to use scene Render, that way the render result is defined
-   * for display in render/imagewindow
-   *
-   * Hmm, don't see, why we can't do that all the time,
-   * and since G.is_rendering is uhm, gone... (Peter)
-   */
-
-  /* New info:
-   * Using the same name for the renders works just fine as the do_render_seq()
-   * render is not used while the scene strips are rendered.
-   *
-   * However rendering from UI (through sequencer_preview_area_draw) can crash in
-   * very many cases since other renders (material preview, an actual render etc.)
-   * can be started while this sequence preview render is running. The only proper
-   * solution is to make the sequencer preview render a proper job, which can be
-   * stopped when needed. This would also give a nice progress bar for the preview
-   * space so that users know there's something happening.
-   *
-   * As a result the active scene now only uses OpenGL rendering for the sequencer
-   * preview. This is far from nice, but is the only way to prevent crashes at this
-   * time.
-   *
-   * -jahka
-   */
-
-  const bool is_rendering = G.is_rendering;
-  const bool is_background = G.background;
-  const bool do_seq_gl = is_rendering ? 0 : (context->scene->r.seq_prev_type) != OB_RENDER;
-  bool have_comp = false;
-  bool use_gpencil = true;
-  /* do we need to re-evaluate the frame after rendering? */
-  bool is_frame_update = false;
-  Scene *scene;
-  int is_thread_main = BLI_thread_is_main();
-
-  /* don't refer to seq->scene above this point!, it can be NULL */
-  if (seq->scene == NULL) {
-    return NULL;
-  }
-
-  /* Prevent rendering scene recursively. */
-  if (seq->scene == context->scene) {
-    return NULL;
-  }
-
-  scene = seq->scene;
-  frame = (double)scene->r.sfra + (double)nr + (double)seq->anim_startofs;
-
-#if 0 /* UNUSED */
-  have_seq = (scene->r.scemode & R_DOSEQ) && scene->ed && scene->ed->seqbase.first);
-#endif
-  have_comp = (scene->r.scemode & R_DOCOMP) && scene->use_nodes && scene->nodetree;
-
-  /* Get view layer for the strip. */
-  ViewLayer *view_layer = BKE_view_layer_default_render(scene);
-  /* Depsgraph will be NULL when doing rendering. */
-  Depsgraph *depsgraph = NULL;
-
-  orig_data.scemode = scene->r.scemode;
-  orig_data.cfra = scene->r.cfra;
-  orig_data.subframe = scene->r.subframe;
-#ifdef DURIAN_CAMERA_SWITCH
-  orig_data.mode = scene->r.mode;
-#endif
-
-  BKE_scene_frame_set(scene, frame);
-
-  if (seq->scene_camera) {
-    camera = seq->scene_camera;
-  }
-  else {
-    BKE_scene_camera_switch_update(scene);
-    camera = scene->camera;
-  }
-
-  if (have_comp == false && camera == NULL) {
-    goto finally;
-  }
-
-  if (seq->flag & SEQ_SCENE_NO_GPENCIL) {
-    use_gpencil = false;
-  }
-
-  /* prevent eternal loop */
-  scene->r.scemode &= ~R_DOSEQ;
-
-#ifdef DURIAN_CAMERA_SWITCH
-  /* stooping to new low's in hackyness :( */
-  scene->r.mode |= R_NO_CAMERA_SWITCH;
-#endif
-
-  is_frame_update = (orig_data.cfra != scene->r.cfra) || (orig_data.subframe != scene->r.subframe);
-
-  if ((sequencer_view3d_fn && do_seq_gl && camera) && is_thread_main) {
-    char err_out[256] = "unknown";
-    const int width = (scene->r.xsch * scene->r.size) / 100;
-    const int height = (scene->r.ysch * scene->r.size) / 100;
-    const char *viewname = BKE_scene_multiview_render_view_name_get(&scene->r, context->view_id);
-
-    unsigned int draw_flags = V3D_OFSDRAW_NONE;
-    draw_flags |= (use_gpencil) ? V3D_OFSDRAW_SHOW_ANNOTATION : 0;
-    draw_flags |= (context->scene->r.seq_flag & R_SEQ_OVERRIDE_SCENE_SETTINGS) ?
-                      V3D_OFSDRAW_OVERRIDE_SCENE_SETTINGS :
-                      0;
-
-    /* for old scene this can be uninitialized,
-     * should probably be added to do_versions at some point if the functionality stays */
-    if (context->scene->r.seq_prev_type == 0) {
-      context->scene->r.seq_prev_type = 3 /* == OB_SOLID */;
-    }
-
-    /* opengl offscreen render */
-    depsgraph = BKE_scene_ensure_depsgraph(context->bmain, scene, view_layer);
-    BKE_scene_graph_update_for_newframe(depsgraph);
-    ibuf = sequencer_view3d_fn(
-        /* set for OpenGL render (NULL when scrubbing) */
-        depsgraph,
-        scene,
-        &context->scene->display.shading,
-        context->scene->r.seq_prev_type,
-        camera,
-        width,
-        height,
-        IB_rect,
-        draw_flags,
-        scene->r.alphamode,
-        viewname,
-        context->gpu_offscreen,
-        err_out);
-    if (ibuf == NULL) {
-      fprintf(stderr, "seq_render_scene_strip failed to get opengl buffer: %s\n", err_out);
-    }
-  }
-  else {
-    Render *re = RE_GetSceneRender(scene);
-    const int totviews = BKE_scene_multiview_num_views_get(&scene->r);
-    ImBuf **ibufs_arr;
-
-    ibufs_arr = MEM_callocN(sizeof(ImBuf *) * totviews, "Sequence Image Views Imbufs");
-
-    /* XXX: this if can be removed when sequence preview rendering uses the job system
-     *
-     * disable rendered preview for sequencer while rendering -- it's very much possible
-     * that preview render will went into conflict with final render
-     *
-     * When rendering from command line renderer is called from main thread, in this
-     * case it's always safe to render scene here
-     */
-    if (!is_thread_main || is_rendering == false || is_background || context->for_render) {
-      if (re == NULL) {
-        re = RE_NewSceneRender(scene);
-      }
-
-      RE_RenderFrame(
-          re, context->bmain, scene, have_comp ? NULL : view_layer, camera, frame, false);
-
-      /* restore previous state after it was toggled on & off by RE_RenderFrame */
-      G.is_rendering = is_rendering;
-    }
-
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      SeqRenderData localcontext = *context;
-      RenderResult rres;
-
-      localcontext.view_id = view_id;
-
-      RE_AcquireResultImage(re, &rres, view_id);
-
-      if (rres.rectf) {
-        ibufs_arr[view_id] = IMB_allocImBuf(rres.rectx, rres.recty, 32, IB_rectfloat);
-        memcpy(ibufs_arr[view_id]->rect_float,
-               rres.rectf,
-               sizeof(float[4]) * rres.rectx * rres.recty);
-
-        if (rres.rectz) {
-          addzbuffloatImBuf(ibufs_arr[view_id]);
-          memcpy(
-              ibufs_arr[view_id]->zbuf_float, rres.rectz, sizeof(float) * rres.rectx * rres.recty);
-        }
-
-        /* float buffers in the sequencer are not linear */
-        BKE_sequencer_imbuf_to_sequencer_space(context->scene, ibufs_arr[view_id], false);
-      }
-      else if (rres.rect32) {
-        ibufs_arr[view_id] = IMB_allocImBuf(rres.rectx, rres.recty, 32, IB_rect);
-        memcpy(ibufs_arr[view_id]->rect, rres.rect32, 4 * rres.rectx * rres.recty);
-      }
-
-      if (view_id != context->view_id) {
-        BKE_sequencer_cache_put(
-            &localcontext, seq, cfra, SEQ_CACHE_STORE_RAW, ibufs_arr[view_id], 0, false);
-      }
-
-      RE_ReleaseResultImage(re);
-    }
-
-    /* return the original requested ImBuf */
-    ibuf = ibufs_arr[context->view_id];
-
-    /* "remove" the others (decrease their refcount) */
-    for (int view_id = 0; view_id < totviews; view_id++) {
-      if (ibufs_arr[view_id] != ibuf) {
-        IMB_freeImBuf(ibufs_arr[view_id]);
-      }
-    }
-    MEM_freeN(ibufs_arr);
-  }
-
-finally:
-  /* restore */
-  scene->r.scemode = orig_data.scemode;
-  scene->r.cfra = orig_data.cfra;
-  scene->r.subframe = orig_data.subframe;
-
-  if (is_frame_update && (depsgraph != NULL)) {
-    BKE_scene_graph_update_for_newframe(depsgraph);
-  }
-
-#ifdef DURIAN_CAMERA_SWITCH
-  /* stooping to new low's in hackyness :( */
-  scene->r.mode &= orig_data.mode | ~R_NO_CAMERA_SWITCH;
-#endif
-
-  return ibuf;
-}
-
-/**
- * Used for meta-strips & scenes with #SEQ_SCENE_STRIPS flag set.
- */
-static ImBuf *do_render_strip_seqbase(const SeqRenderData *context,
-                                      SeqRenderState *state,
-                                      Sequence *seq,
-                                      float nr)
-{
-  ImBuf *ibuf = NULL;
-  ListBase *seqbase = NULL;
-  int offset;
-
-  seqbase = BKE_sequence_seqbase_get(seq, &offset);
-
-  if (seqbase && !BLI_listbase_is_empty(seqbase)) {
-
-    if (seq->flag & SEQ_SCENE_STRIPS && seq->scene) {
-      BKE_animsys_evaluate_all_animation(context->bmain, context->depsgraph, nr + offset);
-    }
-
-    ibuf = seq_render_strip_stack(context,
-                                  state,
-                                  seqbase,
-                                  /* scene strips don't have their start taken into account */
-                                  nr + offset,
-                                  0);
-  }
-
-  return ibuf;
-}
-
-static ImBuf *do_render_strip_uncached(const SeqRenderData *context,
-                                       SeqRenderState *state,
-                                       Sequence *seq,
-                                       float cfra,
-                                       bool *r_is_proxy_image)
-{
-  ImBuf *ibuf = NULL;
-  float nr = BKE_sequencer_give_stripelem_index(seq, cfra);
-  int type = (seq->type & SEQ_TYPE_EFFECT) ? SEQ_TYPE_EFFECT : seq->type;
-  switch (type) {
-    case SEQ_TYPE_META: {
-      ibuf = do_render_strip_seqbase(context, state, seq, nr);
-      break;
-    }
-
-    case SEQ_TYPE_SCENE: {
-      if (seq->flag & SEQ_SCENE_STRIPS) {
-        if (seq->scene && (context->scene != seq->scene)) {
-          /* recursive check */
-          if (BLI_linklist_index(state->scene_parents, seq->scene) != -1) {
-            break;
-          }
-          LinkNode scene_parent = {
-              .next = state->scene_parents,
-              .link = seq->scene,
-          };
-          state->scene_parents = &scene_parent;
-          /* end check */
-
-          /* Use the Scene Seq's scene for the context when rendering the scene's sequences
-           * (necessary for Multicam Selector among others).
-           */
-          SeqRenderData local_context = *context;
-          local_context.scene = seq->scene;
-          local_context.skip_cache = true;
-
-          ibuf = do_render_strip_seqbase(&local_context, state, seq, nr);
-
-          /* step back in the list */
-          state->scene_parents = state->scene_parents->next;
-        }
-      }
-      else {
-        /* scene can be NULL after deletions */
-        ibuf = seq_render_scene_strip(context, seq, nr, cfra);
-      }
-
-      break;
-    }
-
-    case SEQ_TYPE_EFFECT: {
-      ibuf = seq_render_effect_strip_impl(context, state, seq, cfra);
-      break;
-    }
-
-    case SEQ_TYPE_IMAGE: {
-      ibuf = seq_render_image_strip(context, seq, nr, cfra, r_is_proxy_image);
-      break;
-    }
-
-    case SEQ_TYPE_MOVIE: {
-      ibuf = seq_render_movie_strip(context, seq, nr, cfra, r_is_proxy_image);
-      break;
-    }
-
-    case SEQ_TYPE_MOVIECLIP: {
-      ibuf = seq_render_movieclip_strip(context, seq, nr, r_is_proxy_image);
-
-      if (ibuf) {
-        /* duplicate frame so movie cache wouldn't be confused by sequencer's stuff */
-        ImBuf *i = IMB_dupImBuf(ibuf);
-        IMB_freeImBuf(ibuf);
-        ibuf = i;
-
-        if (ibuf->rect_float) {
-          BKE_sequencer_imbuf_to_sequencer_space(context->scene, ibuf, false);
-        }
-      }
-
-      break;
-    }
-
-    case SEQ_TYPE_MASK: {
-      /* ibuf is always new */
-      ibuf = seq_render_mask_strip(context, seq, nr);
-      break;
-    }
-  }
-
-  if (ibuf) {
-    sequencer_imbuf_assign_spaces(context->scene, ibuf);
-  }
-
-  return ibuf;
-}
-
-/* Estimate time spent by the program rendering the strip */
-static clock_t seq_estimate_render_cost_begin(void)
-{
-  return clock();
-}
-
-static float seq_estimate_render_cost_end(Scene *scene, clock_t begin)
-{
-  clock_t end = clock();
-  float time_spent = (float)(end - begin);
-  float time_max = (1.0f / scene->r.frs_sec) * CLOCKS_PER_SEC;
-
-  if (time_max != 0) {
-    return time_spent / time_max;
-  }
-
-  return 1;
-}
-
-static ImBuf *seq_render_preprocess_ibuf(const SeqRenderData *context,
-                                         Sequence *seq,
-                                         ImBuf *ibuf,
-                                         float cfra,
-                                         clock_t begin,
-                                         bool use_preprocess,
-                                         const bool is_proxy_image)
-{
-  if (context->is_proxy_render == false &&
-      (ibuf->x != context->rectx || ibuf->y != context->recty)) {
-    use_preprocess = true;
-  }
-
-  if (use_preprocess) {
-    float cost = seq_estimate_render_cost_end(context->scene, begin);
-
-    /* TODO(Richard): It should be possible to store in cache if image is proxy,
-     * but it adds quite a bit of complexity. Since proxies are fast to read, I would
-     * rather simplify existing code a bit. */
-    if (!is_proxy_image) {
-      BKE_sequencer_cache_put(context, seq, cfra, SEQ_CACHE_STORE_RAW, ibuf, cost, false);
-    }
-
-    /* Reset timer so we can get partial render time. */
-    begin = seq_estimate_render_cost_begin();
-    ibuf = input_preprocess(context, seq, cfra, ibuf, is_proxy_image);
-  }
-
-  float cost = seq_estimate_render_cost_end(context->scene, begin);
-  BKE_sequencer_cache_put(context, seq, cfra, SEQ_CACHE_STORE_PREPROCESSED, ibuf, cost, false);
-  return ibuf;
-}
-
-static ImBuf *seq_render_strip(const SeqRenderData *context,
-                               SeqRenderState *state,
-                               Sequence *seq,
-                               float cfra)
-{
-  ImBuf *ibuf = NULL;
-  bool use_preprocess = false;
-  bool is_proxy_image = false;
-
-  clock_t begin = seq_estimate_render_cost_begin();
-
-  ibuf = BKE_sequencer_cache_get(context, seq, cfra, SEQ_CACHE_STORE_PREPROCESSED, false);
-  if (ibuf != NULL) {
-    return ibuf;
-  }
-
-  ibuf = BKE_sequencer_cache_get(context, seq, cfra, SEQ_CACHE_STORE_RAW, false);
-  if (ibuf == NULL) {
-    ibuf = do_render_strip_uncached(context, state, seq, cfra, &is_proxy_image);
-  }
-
-  if (ibuf) {
-    use_preprocess = BKE_sequencer_input_have_to_preprocess(context, seq, cfra);
-    ibuf = seq_render_preprocess_ibuf(
-        context, seq, ibuf, cfra, begin, use_preprocess, is_proxy_image);
-  }
-
-  if (ibuf == NULL) {
-    ibuf = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-    sequencer_imbuf_assign_spaces(context->scene, ibuf);
-  }
-
-  return ibuf;
-}
-
-/*********************** strip stack rendering functions *************************/
-
-static bool seq_must_swap_input_in_blend_mode(Sequence *seq)
-{
-  bool swap_input = false;
-
-  /* bad hack, to fix crazy input ordering of
-   * those two effects */
-
-  if (ELEM(seq->blend_mode, SEQ_TYPE_ALPHAOVER, SEQ_TYPE_ALPHAUNDER, SEQ_TYPE_OVERDROP)) {
-    swap_input = true;
-  }
-
-  return swap_input;
-}
-
-static int seq_get_early_out_for_blend_mode(Sequence *seq)
-{
-  struct SeqEffectHandle sh = BKE_sequence_get_blend(seq);
-  float facf = seq->blend_opacity / 100.0f;
-  int early_out = sh.early_out(seq, facf, facf);
-
-  if (ELEM(early_out, EARLY_DO_EFFECT, EARLY_NO_INPUT)) {
-    return early_out;
-  }
-
-  if (seq_must_swap_input_in_blend_mode(seq)) {
-    if (early_out == EARLY_USE_INPUT_2) {
-      return EARLY_USE_INPUT_1;
-    }
-    if (early_out == EARLY_USE_INPUT_1) {
-      return EARLY_USE_INPUT_2;
-    }
-  }
-  return early_out;
-}
-
-static ImBuf *seq_render_strip_stack_apply_effect(
-    const SeqRenderData *context, Sequence *seq, float cfra, ImBuf *ibuf1, ImBuf *ibuf2)
-{
-  ImBuf *out;
-  struct SeqEffectHandle sh = BKE_sequence_get_blend(seq);
-  float facf = seq->blend_opacity / 100.0f;
-  int swap_input = seq_must_swap_input_in_blend_mode(seq);
-
-  if (swap_input) {
-    if (sh.multithreaded) {
-      out = BKE_sequencer_effect_execute_threaded(
-          &sh, context, seq, cfra, facf, facf, ibuf2, ibuf1, NULL);
-    }
-    else {
-      out = sh.execute(context, seq, cfra, facf, facf, ibuf2, ibuf1, NULL);
-    }
-  }
-  else {
-    if (sh.multithreaded) {
-      out = BKE_sequencer_effect_execute_threaded(
-          &sh, context, seq, cfra, facf, facf, ibuf1, ibuf2, NULL);
-    }
-    else {
-      out = sh.execute(context, seq, cfra, facf, facf, ibuf1, ibuf2, NULL);
-    }
-  }
-
-  return out;
-}
-
-static ImBuf *seq_render_strip_stack(const SeqRenderData *context,
-                                     SeqRenderState *state,
-                                     ListBase *seqbasep,
-                                     float cfra,
-                                     int chanshown)
-{
-  Sequence *seq_arr[MAXSEQ + 1];
-  int count;
-  int i;
-  ImBuf *out = NULL;
-  clock_t begin;
-
-  count = BKE_sequencer_get_shown_sequences(seqbasep, cfra, chanshown, (Sequence **)&seq_arr);
-
-  if (count == 0) {
-    return NULL;
-  }
-
-  for (i = count - 1; i >= 0; i--) {
-    int early_out;
-    Sequence *seq = seq_arr[i];
-
-    out = BKE_sequencer_cache_get(context, seq, cfra, SEQ_CACHE_STORE_COMPOSITE, false);
-
-    if (out) {
-      break;
-    }
-    if (seq->blend_mode == SEQ_BLEND_REPLACE) {
-      out = seq_render_strip(context, state, seq, cfra);
-      break;
-    }
-
-    early_out = seq_get_early_out_for_blend_mode(seq);
-
-    switch (early_out) {
-      case EARLY_NO_INPUT:
-      case EARLY_USE_INPUT_2:
-        out = seq_render_strip(context, state, seq, cfra);
-        break;
-      case EARLY_USE_INPUT_1:
-        if (i == 0) {
-          out = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-        }
-        break;
-      case EARLY_DO_EFFECT:
-        if (i == 0) {
-          begin = seq_estimate_render_cost_begin();
-
-          ImBuf *ibuf1 = IMB_allocImBuf(context->rectx, context->recty, 32, IB_rect);
-          ImBuf *ibuf2 = seq_render_strip(context, state, seq, cfra);
-
-          out = seq_render_strip_stack_apply_effect(context, seq, cfra, ibuf1, ibuf2);
-
-          float cost = seq_estimate_render_cost_end(context->scene, begin);
-          BKE_sequencer_cache_put(
-              context, seq_arr[i], cfra, SEQ_CACHE_STORE_COMPOSITE, out, cost, false);
-
-          IMB_freeImBuf(ibuf1);
-          IMB_freeImBuf(ibuf2);
-        }
-        break;
-    }
-    if (out) {
-      break;
-    }
-  }
-
-  i++;
-  for (; i < count; i++) {
-    begin = seq_estimate_render_cost_begin();
-    Sequence *seq = seq_arr[i];
-
-    if (seq_get_early_out_for_blend_mode(seq) == EARLY_DO_EFFECT) {
-      ImBuf *ibuf1 = out;
-      ImBuf *ibuf2 = seq_render_strip(context, state, seq, cfra);
-
-      out = seq_render_strip_stack_apply_effect(context, seq, cfra, ibuf1, ibuf2);
-
-      IMB_freeImBuf(ibuf1);
-      IMB_freeImBuf(ibuf2);
-    }
-
-    float cost = seq_estimate_render_cost_end(context->scene, begin);
-    BKE_sequencer_cache_put(
-        context, seq_arr[i], cfra, SEQ_CACHE_STORE_COMPOSITE, out, cost, false);
-  }
-
-  return out;
-}
-
-/*
- * returned ImBuf is refed!
- * you have to free after usage!
- */
-
-ImBuf *BKE_sequencer_give_ibuf(const SeqRenderData *context, float cfra, int chanshown)
-{
-  Scene *scene = context->scene;
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  ListBase *seqbasep;
-
-  if (ed == NULL) {
-    return NULL;
-  }
-
-  if ((chanshown < 0) && !BLI_listbase_is_empty(&ed->metastack)) {
-    int count = BLI_listbase_count(&ed->metastack);
-    count = max_ii(count + chanshown, 0);
-    seqbasep = ((MetaStack *)BLI_findlink(&ed->metastack, count))->oldbasep;
-  }
-  else {
-    seqbasep = ed->seqbasep;
-  }
-
-  SeqRenderState state;
-  sequencer_state_init(&state);
-  ImBuf *out = NULL;
-  Sequence *seq_arr[MAXSEQ + 1];
-  int count;
-
-  count = BKE_sequencer_get_shown_sequences(seqbasep, cfra, chanshown, seq_arr);
-
-  if (count) {
-    out = BKE_sequencer_cache_get(
-        context, seq_arr[count - 1], cfra, SEQ_CACHE_STORE_FINAL_OUT, false);
-  }
-
-  BKE_sequencer_cache_free_temp_cache(context->scene, context->task_id, cfra);
-
-  clock_t begin = seq_estimate_render_cost_begin();
-  float cost = 0;
-
-  if (count && !out) {
-    BLI_mutex_lock(&seq_render_mutex);
-    out = seq_render_strip_stack(context, &state, seqbasep, cfra, chanshown);
-    cost = seq_estimate_render_cost_end(context->scene, begin);
-
-    if (context->is_prefetch_render) {
-      BKE_sequencer_cache_put(
-          context, seq_arr[count - 1], cfra, SEQ_CACHE_STORE_FINAL_OUT, out, cost, false);
-    }
-    else {
-      BKE_sequencer_cache_put_if_possible(
-          context, seq_arr[count - 1], cfra, SEQ_CACHE_STORE_FINAL_OUT, out, cost, false);
-    }
-    BLI_mutex_unlock(&seq_render_mutex);
-  }
-
-  BKE_sequencer_prefetch_start(context, cfra, cost);
-
-  return out;
-}
-
-ImBuf *BKE_sequencer_give_ibuf_seqbase(const SeqRenderData *context,
-                                       float cfra,
-                                       int chan_shown,
-                                       ListBase *seqbasep)
-{
-  SeqRenderState state;
-  sequencer_state_init(&state);
-
-  return seq_render_strip_stack(context, &state, seqbasep, cfra, chan_shown);
-}
-
-ImBuf *BKE_sequencer_give_ibuf_direct(const SeqRenderData *context, float cfra, Sequence *seq)
-{
-  SeqRenderState state;
-  sequencer_state_init(&state);
-
-  ImBuf *ibuf = seq_render_strip(context, &state, seq, cfra);
-
-  return ibuf;
-}
-
-/* check whether sequence cur depends on seq */
-bool BKE_sequence_check_depend(Sequence *seq, Sequence *cur)
-{
-  if (cur->seq1 == seq || cur->seq2 == seq || cur->seq3 == seq) {
-    return true;
-  }
-
-  /* sequences are not intersecting in time, assume no dependency exists between them */
-  if (cur->enddisp < seq->startdisp || cur->startdisp > seq->enddisp) {
-    return false;
-  }
-
-  /* checking sequence is below reference one, not dependent on it */
-  if (cur->machine < seq->machine) {
-    return false;
-  }
-
-  /* sequence is not blending with lower machines, no dependency here occurs
-   * check for non-effects only since effect could use lower machines as input
-   */
-  if ((cur->type & SEQ_TYPE_EFFECT) == 0 &&
-      ((cur->blend_mode == SEQ_BLEND_REPLACE) ||
-       (cur->blend_mode == SEQ_TYPE_CROSS && cur->blend_opacity == 100.0f))) {
-    return false;
-  }
-
-  return true;
-}
-
-static void sequence_do_invalidate_dependent(Scene *scene, Sequence *seq, ListBase *seqbase)
-{
-  Sequence *cur;
-
-  for (cur = seqbase->first; cur; cur = cur->next) {
-    if (cur == seq) {
-      continue;
-    }
-
-    if (BKE_sequence_check_depend(seq, cur)) {
-      /* Effect must be invalidated completely if they depend on invalidated seq. */
-      if ((cur->type & SEQ_TYPE_EFFECT) != 0) {
-        BKE_sequencer_cache_cleanup_sequence(scene, cur, seq, SEQ_CACHE_ALL_TYPES, false);
-      }
-      else {
-        /* In case of alpha over for example only invalidate composite image */
-        BKE_sequencer_cache_cleanup_sequence(
-            scene, cur, seq, SEQ_CACHE_STORE_COMPOSITE | SEQ_CACHE_STORE_FINAL_OUT, false);
-      }
-    }
-
-    if (cur->seqbase.first) {
-      sequence_do_invalidate_dependent(scene, seq, &cur->seqbase);
-    }
-  }
-}
-
-static void sequence_invalidate_cache(Scene *scene,
-                                      Sequence *seq,
-                                      bool invalidate_self,
-                                      int invalidate_types)
-{
-  Editing *ed = scene->ed;
-
-  if (invalidate_self) {
-    BKE_sequence_free_anim(seq);
-    BKE_sequencer_cache_cleanup_sequence(scene, seq, seq, invalidate_types, false);
-  }
-
-  if (seq->effectdata && seq->type == SEQ_TYPE_SPEED) {
-    BKE_sequence_effect_speed_rebuild_map(scene, seq, true);
-  }
-
-  sequence_do_invalidate_dependent(scene, seq, &ed->seqbase);
-  DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
-  BKE_sequencer_prefetch_stop(scene);
-}
-
-void BKE_sequence_invalidate_cache_in_range(Scene *scene,
-                                            Sequence *seq,
-                                            Sequence *range_mask,
-                                            int invalidate_types)
-{
-  BKE_sequencer_cache_cleanup_sequence(scene, seq, range_mask, invalidate_types, true);
-}
-
-void BKE_sequence_invalidate_cache_raw(Scene *scene, Sequence *seq)
-{
-  sequence_invalidate_cache(scene, seq, true, SEQ_CACHE_ALL_TYPES);
-}
-
-void BKE_sequence_invalidate_cache_preprocessed(Scene *scene, Sequence *seq)
-{
-  sequence_invalidate_cache(scene,
-                            seq,
-                            true,
-                            SEQ_CACHE_STORE_PREPROCESSED | SEQ_CACHE_STORE_COMPOSITE |
-                                SEQ_CACHE_STORE_FINAL_OUT);
-}
-
-void BKE_sequence_invalidate_cache_composite(Scene *scene, Sequence *seq)
-{
-  if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD)) {
-    return;
-  }
-
-  sequence_invalidate_cache(
-      scene, seq, true, SEQ_CACHE_STORE_COMPOSITE | SEQ_CACHE_STORE_FINAL_OUT);
-}
-
-void BKE_sequence_invalidate_dependent(Scene *scene, Sequence *seq)
-{
-  if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD)) {
-    return;
-  }
-
-  sequence_invalidate_cache(
-      scene, seq, false, SEQ_CACHE_STORE_COMPOSITE | SEQ_CACHE_STORE_FINAL_OUT);
-}
-
-static void invalidate_scene_strips(Scene *scene, Scene *scene_target, ListBase *seqbase)
-{
-  for (Sequence *seq = seqbase->first; seq != NULL; seq = seq->next) {
-    if (seq->scene == scene_target) {
-      BKE_sequence_invalidate_cache_raw(scene, seq);
-    }
-
-    if (seq->seqbase.first != NULL) {
-      invalidate_scene_strips(scene, scene_target, &seq->seqbase);
-    }
-  }
-}
-
-void BKE_sequence_invalidate_scene_strips(Main *bmain, Scene *scene_target)
-{
-  for (Scene *scene = bmain->scenes.first; scene != NULL; scene = scene->id.next) {
-    if (scene->ed != NULL) {
-      invalidate_scene_strips(scene, scene_target, &scene->ed->seqbase);
-    }
-  }
-}
-
-static void invalidate_movieclip_strips(Scene *scene, MovieClip *clip_target, ListBase *seqbase)
-{
-  for (Sequence *seq = seqbase->first; seq != NULL; seq = seq->next) {
-    if (seq->clip == clip_target) {
-      BKE_sequence_invalidate_cache_raw(scene, seq);
-    }
-
-    if (seq->seqbase.first != NULL) {
-      invalidate_movieclip_strips(scene, clip_target, &seq->seqbase);
-    }
-  }
-}
-
-void BKE_sequence_invalidate_movieclip_strips(Main *bmain, MovieClip *clip_target)
-{
-  for (Scene *scene = bmain->scenes.first; scene != NULL; scene = scene->id.next) {
-    if (scene->ed != NULL) {
-      invalidate_movieclip_strips(scene, clip_target, &scene->ed->seqbase);
-    }
-  }
-}
-
-void BKE_sequencer_free_imbuf(Scene *scene, ListBase *seqbase, bool for_render)
-{
-  if (scene->ed == NULL) {
-    return;
-  }
-
-  Sequence *seq;
-
-  BKE_sequencer_cache_cleanup(scene);
-  BKE_sequencer_prefetch_stop(scene);
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    if (for_render && CFRA >= seq->startdisp && CFRA <= seq->enddisp) {
-      continue;
-    }
-
-    if (seq->strip) {
-      if (seq->type == SEQ_TYPE_MOVIE) {
-        BKE_sequence_free_anim(seq);
-      }
-      if (seq->type == SEQ_TYPE_SPEED) {
-        BKE_sequence_effect_speed_rebuild_map(scene, seq, true);
-      }
-    }
-    if (seq->type == SEQ_TYPE_META) {
-      BKE_sequencer_free_imbuf(scene, &seq->seqbase, for_render);
-    }
-    if (seq->type == SEQ_TYPE_SCENE) {
-      /* FIXME: recurs downwards,
-       * but do recurs protection somehow! */
-    }
-  }
-}
-
-static bool update_changed_seq_recurs(
-    Scene *scene, Sequence *seq, Sequence *changed_seq, int len_change, int ibuf_change)
-{
-  Sequence *subseq;
-  bool free_imbuf = false;
-
-  /* recurs downwards to see if this seq depends on the changed seq */
-
-  if (seq == NULL) {
-    return false;
-  }
-
-  if (seq == changed_seq) {
-    free_imbuf = true;
-  }
-
-  for (subseq = seq->seqbase.first; subseq; subseq = subseq->next) {
-    if (update_changed_seq_recurs(scene, subseq, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-
-  if (seq->seq1) {
-    if (update_changed_seq_recurs(scene, seq->seq1, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-  if (seq->seq2 && (seq->seq2 != seq->seq1)) {
-    if (update_changed_seq_recurs(scene, seq->seq2, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-  if (seq->seq3 && (seq->seq3 != seq->seq1) && (seq->seq3 != seq->seq2)) {
-    if (update_changed_seq_recurs(scene, seq->seq3, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-
-  if (free_imbuf) {
-    if (ibuf_change) {
-      if (seq->type == SEQ_TYPE_MOVIE) {
-        BKE_sequence_free_anim(seq);
-      }
-      else if (seq->type == SEQ_TYPE_SPEED) {
-        BKE_sequence_effect_speed_rebuild_map(scene, seq, true);
-      }
-    }
-
-    if (len_change) {
-      BKE_sequence_calc(scene, seq);
-    }
-  }
-
-  return free_imbuf;
-}
-
-void BKE_sequencer_update_changed_seq_and_deps(Scene *scene,
-                                               Sequence *changed_seq,
-                                               int len_change,
-                                               int ibuf_change)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  Sequence *seq;
-
-  if (ed == NULL) {
-    return;
-  }
-
-  for (seq = ed->seqbase.first; seq; seq = seq->next) {
-    update_changed_seq_recurs(scene, seq, changed_seq, len_change, ibuf_change);
-  }
-}
-
-/* seq funcs's for transforming internally
- * notice the difference between start/end and left/right.
- *
- * left and right are the bounds at which the sequence is rendered,
- * start and end are from the start and fixed length of the sequence.
- */
-static int seq_tx_get_start(Sequence *seq)
-{
-  return seq->start;
-}
-static int seq_tx_get_end(Sequence *seq)
-{
-  return seq->start + seq->len;
-}
-
-int BKE_sequence_tx_get_final_left(Sequence *seq, bool metaclip)
-{
-  if (metaclip && seq->tmp) {
-    /* return the range clipped by the parents range */
-    return max_ii(BKE_sequence_tx_get_final_left(seq, false),
-                  BKE_sequence_tx_get_final_left((Sequence *)seq->tmp, true));
-  }
-
-  return (seq->start - seq->startstill) + seq->startofs;
-}
-int BKE_sequence_tx_get_final_right(Sequence *seq, bool metaclip)
-{
-  if (metaclip && seq->tmp) {
-    /* return the range clipped by the parents range */
-    return min_ii(BKE_sequence_tx_get_final_right(seq, false),
-                  BKE_sequence_tx_get_final_right((Sequence *)seq->tmp, true));
-  }
-
-  return ((seq->start + seq->len) + seq->endstill) - seq->endofs;
-}
-
-void BKE_sequence_tx_set_final_left(Sequence *seq, int val)
-{
-  if (val < (seq)->start) {
-    seq->startstill = abs(val - (seq)->start);
-    seq->startofs = 0;
-  }
-  else {
-    seq->startofs = abs(val - (seq)->start);
-    seq->startstill = 0;
-  }
-}
-
-void BKE_sequence_tx_set_final_right(Sequence *seq, int val)
-{
-  if (val > (seq)->start + (seq)->len) {
-    seq->endstill = abs(val - (seq->start + (seq)->len));
-    seq->endofs = 0;
-  }
-  else {
-    seq->endofs = abs(val - ((seq)->start + (seq)->len));
-    seq->endstill = 0;
-  }
-}
-
-/* used so we can do a quick check for single image seq
- * since they work a bit differently to normal image seq's (during transform) */
-bool BKE_sequence_single_check(Sequence *seq)
-{
-  return ((seq->len == 1) &&
-          (seq->type == SEQ_TYPE_IMAGE ||
-           ((seq->type & SEQ_TYPE_EFFECT) && BKE_sequence_effect_get_num_inputs(seq->type) == 0)));
-}
-
-/* check if the selected seq's reference unselected seq's */
-bool BKE_sequence_base_isolated_sel_check(ListBase *seqbase)
-{
-  Sequence *seq;
-  /* is there more than 1 select */
-  bool ok = false;
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    if (seq->flag & SELECT) {
-      ok = true;
-      break;
-    }
-  }
-
-  if (ok == false) {
-    return false;
-  }
-
-  /* test relationships */
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    if ((seq->type & SEQ_TYPE_EFFECT) == 0) {
-      continue;
-    }
-
-    if (seq->flag & SELECT) {
-      if ((seq->seq1 && (seq->seq1->flag & SELECT) == 0) ||
-          (seq->seq2 && (seq->seq2->flag & SELECT) == 0) ||
-          (seq->seq3 && (seq->seq3->flag & SELECT) == 0)) {
-        return false;
-      }
-    }
-    else {
-      if ((seq->seq1 && (seq->seq1->flag & SELECT)) || (seq->seq2 && (seq->seq2->flag & SELECT)) ||
-          (seq->seq3 && (seq->seq3->flag & SELECT))) {
-        return false;
-      }
-    }
-  }
-
-  return true;
-}
-
-/* use to impose limits when dragging/extending - so impossible situations don't happen
- * Cant use the SEQ_LEFTSEL and SEQ_LEFTSEL directly because the strip may be in a metastrip */
-void BKE_sequence_tx_handle_xlimits(Sequence *seq, int leftflag, int rightflag)
-{
-  if (leftflag) {
-    if (BKE_sequence_tx_get_final_left(seq, false) >=
-        BKE_sequence_tx_get_final_right(seq, false)) {
-      BKE_sequence_tx_set_final_left(seq, BKE_sequence_tx_get_final_right(seq, false) - 1);
-    }
-
-    if (BKE_sequence_single_check(seq) == 0) {
-      if (BKE_sequence_tx_get_final_left(seq, false) >= seq_tx_get_end(seq)) {
-        BKE_sequence_tx_set_final_left(seq, seq_tx_get_end(seq) - 1);
-      }
-
-      /* doesn't work now - TODO */
-#if 0
-      if (seq_tx_get_start(seq) >= seq_tx_get_final_right(seq, 0)) {
-        int ofs;
-        ofs = seq_tx_get_start(seq) - seq_tx_get_final_right(seq, 0);
-        seq->start -= ofs;
-        seq_tx_set_final_left(seq, seq_tx_get_final_left(seq, 0) + ofs);
-      }
-#endif
-    }
-  }
-
-  if (rightflag) {
-    if (BKE_sequence_tx_get_final_right(seq, false) <=
-        BKE_sequence_tx_get_final_left(seq, false)) {
-      BKE_sequence_tx_set_final_right(seq, BKE_sequence_tx_get_final_left(seq, false) + 1);
-    }
-
-    if (BKE_sequence_single_check(seq) == 0) {
-      if (BKE_sequence_tx_get_final_right(seq, false) <= seq_tx_get_start(seq)) {
-        BKE_sequence_tx_set_final_right(seq, seq_tx_get_start(seq) + 1);
-      }
-    }
-  }
-
-  /* sounds cannot be extended past their endpoints */
-  if (seq->type == SEQ_TYPE_SOUND_RAM) {
-    seq->startstill = 0;
-    seq->endstill = 0;
-  }
-}
-
-void BKE_sequence_single_fix(Sequence *seq)
-{
-  int left, start, offset;
-  if (!BKE_sequence_single_check(seq)) {
-    return;
-  }
-
-  /* make sure the image is always at the start since there is only one,
-   * adjusting its start should be ok */
-  left = BKE_sequence_tx_get_final_left(seq, false);
-  start = seq->start;
-  if (start != left) {
-    offset = left - start;
-    BKE_sequence_tx_set_final_left(seq, BKE_sequence_tx_get_final_left(seq, false) - offset);
-    BKE_sequence_tx_set_final_right(seq, BKE_sequence_tx_get_final_right(seq, false) - offset);
-    seq->start += offset;
-  }
-}
-
-bool BKE_sequence_tx_test(Sequence *seq)
-{
-  return !(seq->type & SEQ_TYPE_EFFECT) || (BKE_sequence_effect_get_num_inputs(seq->type) == 0);
-}
-
-/**
- * Return \a true if given \a seq needs a complete cleanup of its cache when it is transformed.
- *
- * Some (effect) strip types need a complete recache of themselves when they are transformed,
- * because they do not 'contain' anything and do not have any explicit relations to other strips.
- */
-bool BKE_sequence_tx_fullupdate_test(Sequence *seq)
-{
-  return BKE_sequence_tx_test(seq) && ELEM(seq->type, SEQ_TYPE_ADJUSTMENT, SEQ_TYPE_MULTICAM);
-}
-
-static bool seq_overlap(Sequence *seq1, Sequence *seq2)
-{
-  return (seq1 != seq2 && seq1->machine == seq2->machine &&
-          ((seq1->enddisp <= seq2->startdisp) || (seq1->startdisp >= seq2->enddisp)) == 0);
-}
-
-bool BKE_sequence_test_overlap(ListBase *seqbasep, Sequence *test)
-{
-  Sequence *seq;
-
-  seq = seqbasep->first;
-  while (seq) {
-    if (seq_overlap(test, seq)) {
-      return true;
-    }
-
-    seq = seq->next;
-  }
-  return false;
-}
-
-void BKE_sequence_translate(Scene *evil_scene, Sequence *seq, int delta)
-{
-  if (delta == 0) {
-    return;
-  }
-
-  BKE_sequencer_offset_animdata(evil_scene, seq, delta);
-  seq->start += delta;
-
-  if (seq->type == SEQ_TYPE_META) {
-    Sequence *seq_child;
-    for (seq_child = seq->seqbase.first; seq_child; seq_child = seq_child->next) {
-      BKE_sequence_translate(evil_scene, seq_child, delta);
-    }
-  }
-
-  BKE_sequence_calc_disp(evil_scene, seq);
-}
-
-void BKE_sequence_sound_init(Scene *scene, Sequence *seq)
-{
-  if (seq->type == SEQ_TYPE_META) {
-    Sequence *seq_child;
-    for (seq_child = seq->seqbase.first; seq_child; seq_child = seq_child->next) {
-      BKE_sequence_sound_init(scene, seq_child);
-    }
-  }
-  else {
-    if (seq->sound) {
-      seq->scene_sound = BKE_sound_add_scene_sound_defaults(scene, seq);
-    }
-    if (seq->scene) {
-      seq->scene_sound = BKE_sound_scene_add_scene_sound_defaults(scene, seq);
-    }
-  }
-}
-
-const Sequence *BKE_sequencer_foreground_frame_get(const Scene *scene, int frame)
-{
-  const Editing *ed = scene->ed;
-  const Sequence *seq, *best_seq = NULL;
-  int best_machine = -1;
-
-  if (!ed) {
-    return NULL;
-  }
-
-  for (seq = ed->seqbasep->first; seq; seq = seq->next) {
-    if (seq->flag & SEQ_MUTE || seq->startdisp > frame || seq->enddisp <= frame) {
-      continue;
-    }
-    /* Only use strips that generate an image, not ones that combine
-     * other strips or apply some effect. */
-    if (ELEM(seq->type,
-             SEQ_TYPE_IMAGE,
-             SEQ_TYPE_META,
-             SEQ_TYPE_SCENE,
-             SEQ_TYPE_MOVIE,
-             SEQ_TYPE_COLOR,
-             SEQ_TYPE_TEXT)) {
-      if (seq->machine > best_machine) {
-        best_seq = seq;
-        best_machine = seq->machine;
-      }
-    }
-  }
-  return best_seq;
-}
-
-/* return 0 if there weren't enough space */
-bool BKE_sequence_base_shuffle_ex(ListBase *seqbasep,
-                                  Sequence *test,
-                                  Scene *evil_scene,
-                                  int channel_delta)
-{
-  const int orig_machine = test->machine;
-  BLI_assert(ELEM(channel_delta, -1, 1));
-
-  test->machine += channel_delta;
-  BKE_sequence_calc(evil_scene, test);
-  while (BKE_sequence_test_overlap(seqbasep, test)) {
-    if ((channel_delta > 0) ? (test->machine >= MAXSEQ) : (test->machine < 1)) {
-      break;
-    }
-
-    test->machine += channel_delta;
-    BKE_sequence_calc(
-        evil_scene,
-        test);  // XXX - I don't think this is needed since were only moving vertically, Campbell.
-  }
-
-  if ((test->machine < 1) || (test->machine > MAXSEQ)) {
-    /* Blender 2.4x would remove the strip.
-     * nicer to move it to the end */
-
-    Sequence *seq;
-    int new_frame = test->enddisp;
-
-    for (seq = seqbasep->first; seq; seq = seq->next) {
-      if (seq->machine == orig_machine) {
-        new_frame = max_ii(new_frame, seq->enddisp);
-      }
-    }
-
-    test->machine = orig_machine;
-    new_frame = new_frame + (test->start - test->startdisp); /* adjust by the startdisp */
-    BKE_sequence_translate(evil_scene, test, new_frame - test->start);
-
-    BKE_sequence_calc(evil_scene, test);
-    return false;
-  }
-
-  return true;
-}
-
-bool BKE_sequence_base_shuffle(ListBase *seqbasep, Sequence *test, Scene *evil_scene)
-{
-  return BKE_sequence_base_shuffle_ex(seqbasep, test, evil_scene, 1);
-}
-
-static int shuffle_seq_time_offset_test(ListBase *seqbasep, char dir)
-{
-  int offset = 0;
-  Sequence *seq, *seq_other;
-
-  for (seq = seqbasep->first; seq; seq = seq->next) {
-    if (seq->tmp) {
-      for (seq_other = seqbasep->first; seq_other; seq_other = seq_other->next) {
-        if (!seq_other->tmp && seq_overlap(seq, seq_other)) {
-          if (dir == 'L') {
-            offset = min_ii(offset, seq_other->startdisp - seq->enddisp);
-          }
-          else {
-            offset = max_ii(offset, seq_other->enddisp - seq->startdisp);
-          }
-        }
-      }
-    }
-  }
-  return offset;
-}
-
-static int shuffle_seq_time_offset(Scene *scene, ListBase *seqbasep, char dir)
-{
-  int ofs = 0;
-  int tot_ofs = 0;
-  Sequence *seq;
-  while ((ofs = shuffle_seq_time_offset_test(seqbasep, dir))) {
-    for (seq = seqbasep->first; seq; seq = seq->next) {
-      if (seq->tmp) {
-        /* seq_test_overlap only tests display values */
-        seq->startdisp += ofs;
-        seq->enddisp += ofs;
-      }
-    }
-
-    tot_ofs += ofs;
-  }
-
-  for (seq = seqbasep->first; seq; seq = seq->next) {
-    if (seq->tmp) {
-      BKE_sequence_calc_disp(scene, seq); /* corrects dummy startdisp/enddisp values */
-    }
-  }
-
-  return tot_ofs;
-}
-
-bool BKE_sequence_base_shuffle_time(ListBase *seqbasep,
-                                    Scene *evil_scene,
-                                    ListBase *markers,
-                                    const bool use_sync_markers)
-{
-  /* note: seq->tmp is used to tag strips to move */
-
-  Sequence *seq;
-
-  int offset_l = shuffle_seq_time_offset(evil_scene, seqbasep, 'L');
-  int offset_r = shuffle_seq_time_offset(evil_scene, seqbasep, 'R');
-  int offset = (-offset_l < offset_r) ? offset_l : offset_r;
-
-  if (offset) {
-    for (seq = seqbasep->first; seq; seq = seq->next) {
-      if (seq->tmp) {
-        BKE_sequence_translate(evil_scene, seq, offset);
-        seq->flag &= ~SEQ_OVERLAP;
-      }
-    }
-
-    if (use_sync_markers && !(evil_scene->toolsettings->lock_markers) && (markers != NULL)) {
-      TimeMarker *marker;
-      /* affect selected markers - it's unlikely that we will want to affect all in this way? */
-      for (marker = markers->first; marker; marker = marker->next) {
-        if (marker->flag & SELECT) {
-          marker->frame += offset;
-        }
-      }
-    }
-  }
-
-  return offset ? false : true;
-}
-
-/* Unlike _update_sound_ funcs, these ones take info from audaspace to update sequence length! */
-#ifdef WITH_AUDASPACE
-static bool sequencer_refresh_sound_length_recursive(Main *bmain, Scene *scene, ListBase *seqbase)
-{
-  Sequence *seq;
-  bool changed = false;
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    if (seq->type == SEQ_TYPE_META) {
-      if (sequencer_refresh_sound_length_recursive(bmain, scene, &seq->seqbase)) {
-        BKE_sequence_calc(scene, seq);
-        changed = true;
-      }
-    }
-    else if (seq->type == SEQ_TYPE_SOUND_RAM && seq->sound) {
-      const float length = BKE_sound_get_length(bmain, seq->sound);
-      int old = seq->len;
-      float fac;
-
-      seq->len = (int)ceil((double)length * FPS);
-      fac = (float)seq->len / (float)old;
-      old = seq->startofs;
-      seq->startofs *= fac;
-      seq->endofs *= fac;
-      seq->start += (old - seq->startofs); /* So that visual/"real" start frame does not change! */
-
-      BKE_sequence_calc(scene, seq);
-      changed = true;
-    }
-  }
-  return changed;
-}
-#endif
-
-void BKE_sequencer_refresh_sound_length(Main *bmain, Scene *scene)
-{
-#ifdef WITH_AUDASPACE
-  if (scene->ed) {
-    sequencer_refresh_sound_length_recursive(bmain, scene, &scene->ed->seqbase);
-  }
-#else
-  UNUSED_VARS(bmain, scene);
-#endif
-}
-
-void BKE_sequencer_update_sound_bounds_all(Scene *scene)
-{
-  Editing *ed = scene->ed;
-
-  if (ed) {
-    Sequence *seq;
-
-    for (seq = ed->seqbase.first; seq; seq = seq->next) {
-      if (seq->type == SEQ_TYPE_META) {
-        seq_update_sound_bounds_recursive(scene, seq);
-      }
-      else if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SCENE)) {
-        BKE_sequencer_update_sound_bounds(scene, seq);
-      }
-    }
-  }
-}
-
-void BKE_sequencer_update_sound_bounds(Scene *scene, Sequence *seq)
-{
-  if (seq->type == SEQ_TYPE_SCENE) {
-    if (seq->scene && seq->scene_sound) {
-      /* We have to take into account start frame of the sequence's scene! */
-      int startofs = seq->startofs + seq->anim_startofs + seq->scene->r.sfra;
-
-      BKE_sound_move_scene_sound(scene, seq->scene_sound, seq->startdisp, seq->enddisp, startofs);
-    }
-  }
-  else {
-    BKE_sound_move_scene_sound_defaults(scene, seq);
-  }
-  /* mute is set in seq_update_muting_recursive */
-}
-
-static void seq_update_muting_recursive(ListBase *seqbasep, Sequence *metaseq, int mute)
-{
-  Sequence *seq;
-  int seqmute;
-
-  /* for sound we go over full meta tree to update muted state,
-   * since sound is played outside of evaluating the imbufs, */
-  for (seq = seqbasep->first; seq; seq = seq->next) {
-    seqmute = (mute || (seq->flag & SEQ_MUTE));
-
-    if (seq->type == SEQ_TYPE_META) {
-      /* if this is the current meta sequence, unmute because
-       * all sequences above this were set to mute */
-      if (seq == metaseq) {
-        seqmute = 0;
-      }
-
-      seq_update_muting_recursive(&seq->seqbase, metaseq, seqmute);
-    }
-    else if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SCENE)) {
-      if (seq->scene_sound) {
-        BKE_sound_mute_scene_sound(seq->scene_sound, seqmute);
-      }
-    }
-  }
-}
-
-void BKE_sequencer_update_muting(Editing *ed)
-{
-  if (ed) {
-    /* mute all sounds up to current metastack list */
-    MetaStack *ms = ed->metastack.last;
-
-    if (ms) {
-      seq_update_muting_recursive(&ed->seqbase, ms->parseq, 1);
-    }
-    else {
-      seq_update_muting_recursive(&ed->seqbase, NULL, 0);
-    }
-  }
-}
-
-static void seq_update_sound_recursive(Scene *scene, ListBase *seqbasep, bSound *sound)
-{
-  Sequence *seq;
-
-  for (seq = seqbasep->first; seq; seq = seq->next) {
-    if (seq->type == SEQ_TYPE_META) {
-      seq_update_sound_recursive(scene, &seq->seqbase, sound);
-    }
-    else if (seq->type == SEQ_TYPE_SOUND_RAM) {
-      if (seq->scene_sound && sound == seq->sound) {
-        BKE_sound_update_scene_sound(seq->scene_sound, sound);
-      }
-    }
-  }
-}
-
-void BKE_sequencer_update_sound(Scene *scene, bSound *sound)
-{
-  if (scene->ed) {
-    seq_update_sound_recursive(scene, &scene->ed->seqbase, sound);
-  }
-}
-
-/* in cases where we done know the sequence's listbase */
-ListBase *BKE_sequence_seqbase(ListBase *seqbase, Sequence *seq)
-{
-  Sequence *iseq;
-  ListBase *lb = NULL;
-
-  for (iseq = seqbase->first; iseq; iseq = iseq->next) {
-    if (seq == iseq) {
-      return seqbase;
-    }
-    if (iseq->seqbase.first && (lb = BKE_sequence_seqbase(&iseq->seqbase, seq))) {
-      return lb;
-    }
-  }
-
-  return NULL;
-}
-
-Sequence *BKE_sequence_metastrip(ListBase *seqbase, Sequence *meta, Sequence *seq)
-{
-  Sequence *iseq;
-
-  for (iseq = seqbase->first; iseq; iseq = iseq->next) {
-    Sequence *rval;
-
-    if (seq == iseq) {
-      return meta;
-    }
-    if (iseq->seqbase.first && (rval = BKE_sequence_metastrip(&iseq->seqbase, iseq, seq))) {
-      return rval;
-    }
-  }
-
-  return NULL;
-}
-
-int BKE_sequence_swap(Sequence *seq_a, Sequence *seq_b, const char **error_str)
-{
-  char name[sizeof(seq_a->name)];
-
-  if (seq_a->len != seq_b->len) {
-    *error_str = N_("Strips must be the same length");
-    return 0;
-  }
-
-  /* type checking, could be more advanced but disallow sound vs non-sound copy */
-  if (seq_a->type != seq_b->type) {
-    if (seq_a->type == SEQ_TYPE_SOUND_RAM || seq_b->type == SEQ_TYPE_SOUND_RAM) {
-      *error_str = N_("Strips were not compatible");
-      return 0;
-    }
-
-    /* disallow effects to swap with non-effects strips */
-    if ((seq_a->type & SEQ_TYPE_EFFECT) != (seq_b->type & SEQ_TYPE_EFFECT)) {
-      *error_str = N_("Strips were not compatible");
-      return 0;
-    }
-
-    if ((seq_a->type & SEQ_TYPE_EFFECT) && (seq_b->type & SEQ_TYPE_EFFECT)) {
-      if (BKE_sequence_effect_get_num_inputs(seq_a->type) !=
-          BKE_sequence_effect_get_num_inputs(seq_b->type)) {
-        *error_str = N_("Strips must have the same number of inputs");
-        return 0;
-      }
-    }
-  }
-
-  SWAP(Sequence, *seq_a, *seq_b);
-
-  /* swap back names so animation fcurves don't get swapped */
-  BLI_strncpy(name, seq_a->name + 2, sizeof(name));
-  BLI_strncpy(seq_a->name + 2, seq_b->name + 2, sizeof(seq_b->name) - 2);
-  BLI_strncpy(seq_b->name + 2, name, sizeof(seq_b->name) - 2);
-
-  /* swap back opacity, and overlay mode */
-  SWAP(int, seq_a->blend_mode, seq_b->blend_mode);
-  SWAP(float, seq_a->blend_opacity, seq_b->blend_opacity);
-
-  SWAP(Sequence *, seq_a->prev, seq_b->prev);
-  SWAP(Sequence *, seq_a->next, seq_b->next);
-  SWAP(int, seq_a->start, seq_b->start);
-  SWAP(int, seq_a->startofs, seq_b->startofs);
-  SWAP(int, seq_a->endofs, seq_b->endofs);
-  SWAP(int, seq_a->startstill, seq_b->startstill);
-  SWAP(int, seq_a->endstill, seq_b->endstill);
-  SWAP(int, seq_a->machine, seq_b->machine);
-  SWAP(int, seq_a->startdisp, seq_b->startdisp);
-  SWAP(int, seq_a->enddisp, seq_b->enddisp);
-
-  return 1;
-}
-
-/* r_prefix + [" + escaped_name + "] + \0 */
-#define SEQ_RNAPATH_MAXSTR ((30 + 2 + (SEQ_NAME_MAXSTR * 2) + 2) + 1)
-
-static size_t sequencer_rna_path_prefix(char str[SEQ_RNAPATH_MAXSTR], const char *name)
-{
-  char name_esc[SEQ_NAME_MAXSTR * 2];
-
-  BLI_strescape(name_esc, name, sizeof(name_esc));
-  return BLI_snprintf_rlen(
-      str, SEQ_RNAPATH_MAXSTR, "sequence_editor.sequences_all[\"%s\"]", name_esc);
-}
-
-/* XXX - hackish function needed for transforming strips! TODO - have some better solution */
-void BKE_sequencer_offset_animdata(Scene *scene, Sequence *seq, int ofs)
-{
-  char str[SEQ_RNAPATH_MAXSTR];
-  size_t str_len;
-  FCurve *fcu;
-
-  if (scene->adt == NULL || ofs == 0 || scene->adt->action == NULL) {
-    return;
-  }
-
-  str_len = sequencer_rna_path_prefix(str, seq->name + 2);
-
-  for (fcu = scene->adt->action->curves.first; fcu; fcu = fcu->next) {
-    if (STREQLEN(fcu->rna_path, str, str_len)) {
-      unsigned int i;
-      if (fcu->bezt) {
-        for (i = 0; i < fcu->totvert; i++) {
-          BezTriple *bezt = &fcu->bezt[i];
-          bezt->vec[0][0] += ofs;
-          bezt->vec[1][0] += ofs;
-          bezt->vec[2][0] += ofs;
-        }
-      }
-      if (fcu->fpt) {
-        for (i = 0; i < fcu->totvert; i++) {
-          FPoint *fpt = &fcu->fpt[i];
-          fpt->vec[0] += ofs;
-        }
-      }
-    }
-  }
-
-  DEG_id_tag_update(&scene->adt->action->id, ID_RECALC_ANIMATION);
-}
-
-void BKE_sequencer_dupe_animdata(Scene *scene, const char *name_src, const char *name_dst)
-{
-  char str_from[SEQ_RNAPATH_MAXSTR];
-  size_t str_from_len;
-  FCurve *fcu;
-  FCurve *fcu_last;
-  FCurve *fcu_cpy;
-  ListBase lb = {NULL, NULL};
-
-  if (scene->adt == NULL || scene->adt->action == NULL) {
-    return;
-  }
-
-  str_from_len = sequencer_rna_path_prefix(str_from, name_src);
-
-  fcu_last = scene->adt->action->curves.last;
-
-  for (fcu = scene->adt->action->curves.first; fcu && fcu->prev != fcu_last; fcu = fcu->next) {
-    if (STREQLEN(fcu->rna_path, str_from, str_from_len)) {
-      fcu_cpy = BKE_fcurve_copy(fcu);
-      BLI_addtail(&lb, fcu_cpy);
-    }
-  }
-
-  /* notice validate is 0, keep this because the seq may not be added to the scene yet */
-  BKE_animdata_fix_paths_rename(
-      &scene->id, scene->adt, NULL, "sequence_editor.sequences_all", name_src, name_dst, 0, 0, 0);
-
-  /* add the original fcurves back */
-  BLI_movelisttolist(&scene->adt->action->curves, &lb);
-}
-
-/* XXX - hackish function needed to remove all fcurves belonging to a sequencer strip */
-static void seq_free_animdata(Scene *scene, Sequence *seq)
-{
-  char str[SEQ_RNAPATH_MAXSTR];
-  size_t str_len;
-  FCurve *fcu;
-
-  if (scene->adt == NULL || scene->adt->action == NULL) {
-    return;
-  }
-
-  str_len = sequencer_rna_path_prefix(str, seq->name + 2);
-
-  fcu = scene->adt->action->curves.first;
-
-  while (fcu) {
-    if (STREQLEN(fcu->rna_path, str, str_len)) {
-      FCurve *next_fcu = fcu->next;
-
-      BLI_remlink(&scene->adt->action->curves, fcu);
-      BKE_fcurve_free(fcu);
-
-      fcu = next_fcu;
-    }
-    else {
-      fcu = fcu->next;
-    }
-  }
-}
-
-#undef SEQ_RNAPATH_MAXSTR
-
-Sequence *BKE_sequence_get_by_name(ListBase *seqbase, const char *name, bool recursive)
-{
-  Sequence *iseq = NULL;
-  Sequence *rseq = NULL;
-
-  for (iseq = seqbase->first; iseq; iseq = iseq->next) {
-    if (STREQ(name, iseq->name + 2)) {
-      return iseq;
-    }
-    if (recursive && (iseq->seqbase.first) &&
-        (rseq = BKE_sequence_get_by_name(&iseq->seqbase, name, 1))) {
-      return rseq;
-    }
-  }
-
-  return NULL;
-}
-
-/**
- * Only use as last resort when the StripElem is available but no the Sequence.
- * (needed for RNA)
- */
-Sequence *BKE_sequencer_from_elem(ListBase *seqbase, StripElem *se)
-{
-  Sequence *iseq;
-
-  for (iseq = seqbase->first; iseq; iseq = iseq->next) {
-    Sequence *seq_found;
-    if ((iseq->strip && iseq->strip->stripdata) &&
-        (ARRAY_HAS_ITEM(se, iseq->strip->stripdata, iseq->len))) {
-      break;
-    }
-    if ((seq_found = BKE_sequencer_from_elem(&iseq->seqbase, se))) {
-      iseq = seq_found;
-      break;
-    }
-  }
-
-  return iseq;
-}
-
-Sequence *BKE_sequencer_active_get(Scene *scene)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-
-  if (ed == NULL) {
-    return NULL;
-  }
-
-  return ed->act_seq;
-}
-
-void BKE_sequencer_active_set(Scene *scene, Sequence *seq)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-
-  if (ed == NULL) {
-    return;
-  }
-
-  ed->act_seq = seq;
-}
-
-int BKE_sequencer_active_get_pair(Scene *scene, Sequence **seq_act, Sequence **seq_other)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-
-  *seq_act = BKE_sequencer_active_get(scene);
-
-  if (*seq_act == NULL) {
-    return 0;
-  }
-
-  Sequence *seq;
-
-  *seq_other = NULL;
-
-  for (seq = ed->seqbasep->first; seq; seq = seq->next) {
-    if (seq->flag & SELECT && (seq != (*seq_act))) {
-      if (*seq_other) {
-        return 0;
-      }
-
-      *seq_other = seq;
-    }
-  }
-
-  return (*seq_other != NULL);
-}
-
-Mask *BKE_sequencer_mask_get(Scene *scene)
-{
-  Sequence *seq_act = BKE_sequencer_active_get(scene);
-
-  if (seq_act && seq_act->type == SEQ_TYPE_MASK) {
-    return seq_act->mask;
-  }
-
-  return NULL;
-}
-
-/* api like funcs for adding */
-
-static void seq_load_apply(Main *bmain, Scene *scene, Sequence *seq, SeqLoadInfo *seq_load)
-{
-  if (seq) {
-    BLI_strncpy_utf8(seq->name + 2, seq_load->name, sizeof(seq->name) - 2);
-    BLI_utf8_invalid_strip(seq->name + 2, strlen(seq->name + 2));
-    BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seq);
-
-    if (seq_load->flag & SEQ_LOAD_FRAME_ADVANCE) {
-      seq_load->start_frame += (seq->enddisp - seq->startdisp);
-    }
-
-    if (seq_load->flag & SEQ_LOAD_REPLACE_SEL) {
-      seq_load->flag |= SELECT;
-      BKE_sequencer_active_set(scene, seq);
-    }
-
-    if (seq_load->flag & SEQ_LOAD_SOUND_MONO) {
-      seq->sound->flags |= SOUND_FLAGS_MONO;
-      BKE_sound_load(bmain, seq->sound);
-    }
-
-    if (seq_load->flag & SEQ_LOAD_SOUND_CACHE) {
-      if (seq->sound) {
-        seq->sound->flags |= SOUND_FLAGS_CACHING;
-      }
-    }
-
-    seq_load->tot_success++;
-  }
-  else {
-    seq_load->tot_error++;
-  }
-}
-
-static Strip *seq_strip_alloc(int type)
-{
-  Strip *strip = MEM_callocN(sizeof(Strip), "strip");
-
-  if (ELEM(type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD) == 0) {
-    strip->transform = MEM_callocN(sizeof(struct StripTransform), "StripTransform");
-    strip->crop = MEM_callocN(sizeof(struct StripCrop), "StripCrop");
-  }
-
-  strip->us = 1;
-  return strip;
-}
-
-Sequence *BKE_sequence_alloc(ListBase *lb, int cfra, int machine, int type)
-{
-  Sequence *seq;
-
-  seq = MEM_callocN(sizeof(Sequence), "addseq");
-  BLI_addtail(lb, seq);
-
-  *((short *)seq->name) = ID_SEQ;
-  seq->name[2] = 0;
-
-  seq->flag = SELECT;
-  seq->start = cfra;
-  seq->machine = machine;
-  seq->sat = 1.0;
-  seq->mul = 1.0;
-  seq->blend_opacity = 100.0;
-  seq->volume = 1.0f;
-  seq->pitch = 1.0f;
-  seq->scene_sound = NULL;
-  seq->type = type;
-
-  seq->strip = seq_strip_alloc(type);
-  seq->stereo3d_format = MEM_callocN(sizeof(Stereo3dFormat), "Sequence Stereo Format");
-  seq->cache_flag = SEQ_CACHE_STORE_RAW | SEQ_CACHE_STORE_PREPROCESSED | SEQ_CACHE_STORE_COMPOSITE;
-
-  BKE_sequence_session_uuid_generate(seq);
-
-  return seq;
-}
-
-void BKE_sequence_session_uuid_generate(struct Sequence *sequence)
-{
-  sequence->runtime.session_uuid = BLI_session_uuid_generate();
-}
-
-void BKE_sequence_alpha_mode_from_extension(Sequence *seq)
-{
-  if (seq->strip && seq->strip->stripdata) {
-    const char *filename = seq->strip->stripdata->name;
-    seq->alpha_mode = BKE_image_alpha_mode_from_extension_ex(filename);
-  }
-}
-
-void BKE_sequence_init_colorspace(Sequence *seq)
-{
-  if (seq->strip && seq->strip->stripdata) {
-    char name[FILE_MAX];
-    ImBuf *ibuf;
-
-    BLI_join_dirfile(name, sizeof(name), seq->strip->dir, seq->strip->stripdata->name);
-    BLI_path_abs(name, BKE_main_blendfile_path_from_global());
-
-    /* initialize input color space */
-    if (seq->type == SEQ_TYPE_IMAGE) {
-      ibuf = IMB_loadiffname(
-          name, IB_test | IB_alphamode_detect, seq->strip->colorspace_settings.name);
-
-      /* byte images are default to straight alpha, however sequencer
-       * works in premul space, so mark strip to be premultiplied first
-       */
-      seq->alpha_mode = SEQ_ALPHA_STRAIGHT;
-      if (ibuf) {
-        if (ibuf->flags & IB_alphamode_premul) {
-          seq->alpha_mode = IMA_ALPHA_PREMUL;
-        }
-
-        IMB_freeImBuf(ibuf);
-      }
-    }
-  }
-}
-
-float BKE_sequence_get_fps(Scene *scene, Sequence *seq)
-{
-  switch (seq->type) {
-    case SEQ_TYPE_MOVIE: {
-      seq_open_anim_file(scene, seq, true);
-      if (BLI_listbase_is_empty(&seq->anims)) {
-        return 0.0f;
-      }
-      StripAnim *strip_anim = seq->anims.first;
-      if (strip_anim->anim == NULL) {
-        return 0.0f;
-      }
-      short frs_sec;
-      float frs_sec_base;
-      if (IMB_anim_get_fps(strip_anim->anim, &frs_sec, &frs_sec_base, true)) {
-        return (float)frs_sec / frs_sec_base;
-      }
-      break;
-    }
-    case SEQ_TYPE_MOVIECLIP:
-      if (seq->clip != NULL) {
-        return BKE_movieclip_get_fps(seq->clip);
-      }
-      break;
-    case SEQ_TYPE_SCENE:
-      if (seq->scene != NULL) {
-        return (float)seq->scene->r.frs_sec / seq->scene->r.frs_sec_base;
-      }
-      break;
-  }
-  return 0.0f;
-}
-
-/* NOTE: this function doesn't fill in image names */
-Sequence *BKE_sequencer_add_image_strip(bContext *C, ListBase *seqbasep, SeqLoadInfo *seq_load)
-{
-  Scene *scene = CTX_data_scene(C); /* only for active seq */
-  Sequence *seq;
-  Strip *strip;
-
-  seq = BKE_sequence_alloc(seqbasep, seq_load->start_frame, seq_load->channel, SEQ_TYPE_IMAGE);
-  seq->blend_mode = SEQ_TYPE_CROSS; /* so alpha adjustment fade to the strip below */
-
-  /* basic defaults */
-  seq->len = seq_load->len ? seq_load->len : 1;
-
-  strip = seq->strip;
-  strip->stripdata = MEM_callocN(seq->len * sizeof(StripElem), "stripelem");
-  BLI_strncpy(strip->dir, seq_load->path, sizeof(strip->dir));
-
-  if (seq_load->stereo3d_format) {
-    *seq->stereo3d_format = *seq_load->stereo3d_format;
-  }
-
-  seq->views_format = seq_load->views_format;
-  seq->flag |= seq_load->flag & SEQ_USE_VIEWS;
-
-  seq_load_apply(CTX_data_main(C), scene, seq, seq_load);
-  BKE_sequence_invalidate_cache_composite(scene, seq);
-
-  return seq;
-}
-
-#ifdef WITH_AUDASPACE
-Sequence *BKE_sequencer_add_sound_strip(bContext *C, ListBase *seqbasep, SeqLoadInfo *seq_load)
-{
-  Main *bmain = CTX_data_main(C);
-  Scene *scene = CTX_data_scene(C); /* only for sound */
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  bSound *sound;
-
-  Sequence *seq; /* generic strip vars */
-  Strip *strip;
-  StripElem *se;
-
-  sound = BKE_sound_new_file(bmain, seq_load->path); /* handles relative paths */
-
-  SoundInfo info;
-  if (!BKE_sound_info_get(bmain, sound, &info)) {
-    BKE_id_free(bmain, sound);
-    return NULL;
-  }
-
-  if (info.specs.channels == SOUND_CHANNELS_INVALID) {
-    BKE_id_free(bmain, sound);
-    return NULL;
-  }
-
-  seq = BKE_sequence_alloc(seqbasep, seq_load->start_frame, seq_load->channel, SEQ_TYPE_SOUND_RAM);
-  seq->sound = sound;
-  BLI_strncpy(seq->name + 2, "Sound", SEQ_NAME_MAXSTR - 2);
-  BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seq);
-
-  /* basic defaults */
-  /* We add a very small negative offset here, because
-   * ceil(132.0) == 133.0, not nice with videos, see T47135. */
-  seq->len = (int)ceil((double)info.length * FPS - 1e-4);
-  strip = seq->strip;
-
-  /* we only need 1 element to store the filename */
-  strip->stripdata = se = MEM_callocN(sizeof(StripElem), "stripelem");
-
-  BLI_split_dirfile(seq_load->path, strip->dir, se->name, sizeof(strip->dir), sizeof(se->name));
-
-  seq->scene_sound = NULL;
-
-  BKE_sequence_calc_disp(scene, seq);
-
-  /* last active name */
-  BLI_strncpy(ed->act_sounddir, strip->dir, FILE_MAXDIR);
-
-  seq_load_apply(bmain, scene, seq, seq_load);
-
-  /* TODO(sergey): Shall we tag here or in the operator? */
-  DEG_relations_tag_update(bmain);
-
-  return seq;
-}
-#else   // WITH_AUDASPACE
-Sequence *BKE_sequencer_add_sound_strip(bContext *C, ListBase *seqbasep, SeqLoadInfo *seq_load)
-{
-  (void)C;
-  (void)seqbasep;
-  (void)seq_load;
-  return NULL;
-}
-#endif  // WITH_AUDASPACE
-
-static void seq_anim_add_suffix(Scene *scene, struct anim *anim, const int view_id)
-{
-  const char *suffix = BKE_scene_multiview_view_id_suffix_get(&scene->r, view_id);
-  IMB_suffix_anim(anim, suffix);
-}
-
-Sequence *BKE_sequencer_add_movie_strip(bContext *C, ListBase *seqbasep, SeqLoadInfo *seq_load)
-{
-  Main *bmain = CTX_data_main(C);
-  Scene *scene = CTX_data_scene(C); /* only for sound */
-  char path[sizeof(seq_load->path)];
-
-  Sequence *seq; /* generic strip vars */
-  Strip *strip;
-  StripElem *se;
-  char colorspace[64] = "\0"; /* MAX_COLORSPACE_NAME */
-  bool is_multiview_loaded = false;
-  const bool is_multiview = (seq_load->flag & SEQ_USE_VIEWS) != 0;
-  const int totfiles = seq_num_files(scene, seq_load->views_format, is_multiview);
-  struct anim **anim_arr;
-  int i;
-
-  BLI_strncpy(path, seq_load->path, sizeof(path));
-  BLI_path_abs(path, BKE_main_blendfile_path(bmain));
-
-  anim_arr = MEM_callocN(sizeof(struct anim *) * totfiles, "Video files");
-
-  if (is_multiview && (seq_load->views_format == R_IMF_VIEWS_INDIVIDUAL)) {
-    char prefix[FILE_MAX];
-    const char *ext = NULL;
-    size_t j = 0;
-
-    BKE_scene_multiview_view_prefix_get(scene, path, prefix, &ext);
-
-    if (prefix[0] != '\0') {
-      for (i = 0; i < totfiles; i++) {
-        char str[FILE_MAX];
-
-        seq_multiview_name(scene, i, prefix, ext, str, FILE_MAX);
-        anim_arr[j] = openanim(str, IB_rect, 0, colorspace);
-
-        if (anim_arr[j]) {
-          seq_anim_add_suffix(scene, anim_arr[j], i);
-          j++;
-        }
-      }
-
-      if (j == 0) {
-        MEM_freeN(anim_arr);
-        return NULL;
-      }
-      is_multiview_loaded = true;
-    }
-  }
-
-  if (is_multiview_loaded == false) {
-    anim_arr[0] = openanim(path, IB_rect, 0, colorspace);
-
-    if (anim_arr[0] == NULL) {
-      MEM_freeN(anim_arr);
-      return NULL;
-    }
-  }
-
-  if (seq_load->flag & SEQ_LOAD_MOVIE_SOUND) {
-    seq_load->channel++;
-  }
-  seq = BKE_sequence_alloc(seqbasep, seq_load->start_frame, seq_load->channel, SEQ_TYPE_MOVIE);
-
-  /* multiview settings */
-  if (seq_load->stereo3d_format) {
-    *seq->stereo3d_format = *seq_load->stereo3d_format;
-    seq->views_format = seq_load->views_format;
-  }
-  seq->flag |= seq_load->flag & SEQ_USE_VIEWS;
-
-  seq->type = SEQ_TYPE_MOVIE;
-  seq->blend_mode = SEQ_TYPE_CROSS; /* so alpha adjustment fade to the strip below */
-
-  for (i = 0; i < totfiles; i++) {
-    if (anim_arr[i]) {
-      StripAnim *sanim = MEM_mallocN(sizeof(StripAnim), "Strip Anim");
-      BLI_addtail(&seq->anims, sanim);
-      sanim->anim = anim_arr[i];
-    }
-    else {
-      break;
-    }
-  }
-
-  IMB_anim_load_metadata(anim_arr[0]);
-
-  seq->anim_preseek = IMB_anim_get_preseek(anim_arr[0]);
-  BLI_strncpy(seq->name + 2, "Movie", SEQ_NAME_MAXSTR - 2);
-  BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seq);
-
-  /* adjust scene's frame rate settings to match */
-  if (seq_load->flag & SEQ_LOAD_SYNC_FPS) {
-    IMB_anim_get_fps(anim_arr[0], &scene->r.frs_sec, &scene->r.frs_sec_base, true);
-  }
-
-  /* basic defaults */
-  seq->len = IMB_anim_get_duration(anim_arr[0], IMB_TC_RECORD_RUN);
-  strip = seq->strip;
-
-  BLI_strncpy(seq->strip->colorspace_settings.name,
-              colorspace,
-              sizeof(seq->strip->colorspace_settings.name));
-
-  /* we only need 1 element for MOVIE strips */
-  strip->stripdata = se = MEM_callocN(sizeof(StripElem), "stripelem");
-
-  BLI_split_dirfile(seq_load->path, strip->dir, se->name, sizeof(strip->dir), sizeof(se->name));
-
-  BKE_sequence_calc_disp(scene, seq);
-
-  if (seq_load->name[0] == '\0') {
-    BLI_strncpy(seq_load->name, se->name, sizeof(seq_load->name));
-  }
-
-  if (seq_load->flag & SEQ_LOAD_MOVIE_SOUND) {
-    int start_frame_back = seq_load->start_frame;
-    seq_load->channel--;
-    seq_load->seq_sound = BKE_sequencer_add_sound_strip(C, seqbasep, seq_load);
-    seq_load->start_frame = start_frame_back;
-  }
-
-  /* can be NULL */
-  seq_load_apply(CTX_data_main(C), scene, seq, seq_load);
-  BKE_sequence_invalidate_cache_composite(scene, seq);
-
-  MEM_freeN(anim_arr);
-  return seq;
-}
-
-static Sequence *seq_dupli(const Scene *scene_src,
-                           Scene *scene_dst,
-                           ListBase *new_seq_list,
-                           Sequence *seq,
-                           int dupe_flag,
-                           const int flag)
-{
-  Sequence *seqn = MEM_dupallocN(seq);
-
-  if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
-    BKE_sequence_session_uuid_generate(seq);
-  }
-
-  seq->tmp = seqn;
-  seqn->strip = MEM_dupallocN(seq->strip);
-
-  seqn->stereo3d_format = MEM_dupallocN(seq->stereo3d_format);
-
-  /* XXX: add F-Curve duplication stuff? */
-
-  if (seq->strip->crop) {
-    seqn->strip->crop = MEM_dupallocN(seq->strip->crop);
-  }
-
-  if (seq->strip->transform) {
-    seqn->strip->transform = MEM_dupallocN(seq->strip->transform);
-  }
-
-  if (seq->strip->proxy) {
-    seqn->strip->proxy = MEM_dupallocN(seq->strip->proxy);
-    seqn->strip->proxy->anim = NULL;
-  }
-
-  if (seq->prop) {
-    seqn->prop = IDP_CopyProperty_ex(seq->prop, flag);
-  }
-
-  if (seqn->modifiers.first) {
-    BLI_listbase_clear(&seqn->modifiers);
-
-    BKE_sequence_modifier_list_copy(seqn, seq);
-  }
-
-  if (seq->type == SEQ_TYPE_META) {
-    seqn->strip->stripdata = NULL;
-
-    BLI_listbase_clear(&seqn->seqbase);
-    /* WATCH OUT!!! - This metastrip is not recursively duplicated here - do this after!!! */
-    /* - seq_dupli_recursive(&seq->seqbase, &seqn->seqbase);*/
-  }
-  else if (seq->type == SEQ_TYPE_SCENE) {
-    seqn->strip->stripdata = NULL;
-    if (seq->scene_sound) {
-      seqn->scene_sound = BKE_sound_scene_add_scene_sound_defaults(scene_dst, seqn);
-    }
-  }
-  else if (seq->type == SEQ_TYPE_MOVIECLIP) {
-    /* avoid assert */
-  }
-  else if (seq->type == SEQ_TYPE_MASK) {
-    /* avoid assert */
-  }
-  else if (seq->type == SEQ_TYPE_MOVIE) {
-    seqn->strip->stripdata = MEM_dupallocN(seq->strip->stripdata);
-    BLI_listbase_clear(&seqn->anims);
-  }
-  else if (seq->type == SEQ_TYPE_SOUND_RAM) {
-    seqn->strip->stripdata = MEM_dupallocN(seq->strip->stripdata);
-    seqn->scene_sound = NULL;
-    if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
-      id_us_plus((ID *)seqn->sound);
-    }
-  }
-  else if (seq->type == SEQ_TYPE_IMAGE) {
-    seqn->strip->stripdata = MEM_dupallocN(seq->strip->stripdata);
-  }
-  else if (seq->type & SEQ_TYPE_EFFECT) {
-    struct SeqEffectHandle sh;
-    sh = BKE_sequence_get_effect(seq);
-    if (sh.copy) {
-      sh.copy(seqn, seq, flag);
-    }
-
-    seqn->strip->stripdata = NULL;
-  }
-  else {
-    /* sequence type not handled in duplicate! Expect a crash now... */
-    BLI_assert(0);
-  }
-
-  /* When using SEQ_DUPE_UNIQUE_NAME, it is mandatory to add new sequences in relevant container
-   * (scene or meta's one), *before* checking for unique names. Otherwise the meta's list is empty
-   * and hence we miss all seqs in that meta that have already been duplicated (see T55668).
-   * Note that unique name check itself could be done at a later step in calling code, once all
-   * seqs have bee duplicated (that was first, simpler solution), but then handling of animation
-   * data will be broken (see T60194). */
-  if (new_seq_list != NULL) {
-    BLI_addtail(new_seq_list, seqn);
-  }
-
-  if (scene_src == scene_dst) {
-    if (dupe_flag & SEQ_DUPE_UNIQUE_NAME) {
-      BKE_sequence_base_unique_name_recursive(&scene_dst->ed->seqbase, seqn);
-    }
-
-    if (dupe_flag & SEQ_DUPE_ANIM) {
-      BKE_sequencer_dupe_animdata(scene_dst, seq->name + 2, seqn->name + 2);
-    }
-  }
-
-  return seqn;
-}
-
-static void seq_new_fix_links_recursive(Sequence *seq)
-{
-  SequenceModifierData *smd;
-
-  if (seq->type & SEQ_TYPE_EFFECT) {
-    if (seq->seq1 && seq->seq1->tmp) {
-      seq->seq1 = seq->seq1->tmp;
-    }
-    if (seq->seq2 && seq->seq2->tmp) {
-      seq->seq2 = seq->seq2->tmp;
-    }
-    if (seq->seq3 && seq->seq3->tmp) {
-      seq->seq3 = seq->seq3->tmp;
-    }
-  }
-  else if (seq->type == SEQ_TYPE_META) {
-    Sequence *seqn;
-    for (seqn = seq->seqbase.first; seqn; seqn = seqn->next) {
-      seq_new_fix_links_recursive(seqn);
-    }
-  }
-
-  for (smd = seq->modifiers.first; smd; smd = smd->next) {
-    if (smd->mask_sequence && smd->mask_sequence->tmp) {
-      smd->mask_sequence = smd->mask_sequence->tmp;
-    }
-  }
-}
-
-static Sequence *sequence_dupli_recursive_do(const Scene *scene_src,
-                                             Scene *scene_dst,
-                                             ListBase *new_seq_list,
-                                             Sequence *seq,
-                                             const int dupe_flag)
-{
-  Sequence *seqn;
-
-  seq->tmp = NULL;
-  seqn = seq_dupli(scene_src, scene_dst, new_seq_list, seq, dupe_flag, 0);
-  if (seq->type == SEQ_TYPE_META) {
-    Sequence *s;
-    for (s = seq->seqbase.first; s; s = s->next) {
-      sequence_dupli_recursive_do(scene_src, scene_dst, &seqn->seqbase, s, dupe_flag);
-    }
-  }
-
-  return seqn;
-}
-
-Sequence *BKE_sequence_dupli_recursive(
-    const Scene *scene_src, Scene *scene_dst, ListBase *new_seq_list, Sequence *seq, int dupe_flag)
-{
-  Sequence *seqn = sequence_dupli_recursive_do(scene_src, scene_dst, new_seq_list, seq, dupe_flag);
-
-  /* This does not need to be in recursive call itself, since it is already recursive... */
-  seq_new_fix_links_recursive(seqn);
-
-  return seqn;
-}
-
-void BKE_sequence_base_dupli_recursive(const Scene *scene_src,
-                                       Scene *scene_dst,
-                                       ListBase *nseqbase,
-                                       const ListBase *seqbase,
-                                       int dupe_flag,
-                                       const int flag)
-{
-  Sequence *seq;
-  Sequence *seqn = NULL;
-  Sequence *last_seq = BKE_sequencer_active_get((Scene *)scene_src);
-  /* always include meta's strips */
-  int dupe_flag_recursive = dupe_flag | SEQ_DUPE_ALL | SEQ_DUPE_IS_RECURSIVE_CALL;
-
-  for (seq = seqbase->first; seq; seq = seq->next) {
-    seq->tmp = NULL;
-    if ((seq->flag & SELECT) || (dupe_flag & SEQ_DUPE_ALL)) {
-      seqn = seq_dupli(scene_src, scene_dst, nseqbase, seq, dupe_flag, flag);
-      if (seqn) { /*should never fail */
-        if (dupe_flag & SEQ_DUPE_CONTEXT) {
-          seq->flag &= ~SEQ_ALLSEL;
-          seqn->flag &= ~(SEQ_LEFTSEL + SEQ_RIGHTSEL + SEQ_LOCK);
-        }
-
-        if (seq->type == SEQ_TYPE_META) {
-          BKE_sequence_base_dupli_recursive(
-              scene_src, scene_dst, &seqn->seqbase, &seq->seqbase, dupe_flag_recursive, flag);
-        }
-
-        if (dupe_flag & SEQ_DUPE_CONTEXT) {
-          if (seq == last_seq) {
-            BKE_sequencer_active_set(scene_dst, seqn);
-          }
-        }
-      }
-    }
-  }
-
-  /* Fix modifier links recursively from the top level only, when all sequences have been
-   * copied. */
-  if (dupe_flag & SEQ_DUPE_IS_RECURSIVE_CALL) {
-    return;
-  }
-
-  /* fix modifier linking */
-  for (seq = nseqbase->first; seq; seq = seq->next) {
-    seq_new_fix_links_recursive(seq);
-  }
-}
-
-/* called on draw, needs to be fast,
- * we could cache and use a flag if we want to make checks for file paths resolving for eg. */
-bool BKE_sequence_is_valid_check(Sequence *seq)
-{
-  switch (seq->type) {
-    case SEQ_TYPE_MASK:
-      return (seq->mask != NULL);
-    case SEQ_TYPE_MOVIECLIP:
-      return (seq->clip != NULL);
-    case SEQ_TYPE_SCENE:
-      return (seq->scene != NULL);
-    case SEQ_TYPE_SOUND_RAM:
-      return (seq->sound != NULL);
-  }
-
-  return true;
-}
-
-int BKE_sequencer_find_next_prev_edit(Scene *scene,
-                                      int cfra,
-                                      const short side,
-                                      const bool do_skip_mute,
-                                      const bool do_center,
-                                      const bool do_unselected)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  Sequence *seq;
-
-  int dist, best_dist, best_frame = cfra;
-  int seq_frames[2], seq_frames_tot;
-
-  /* In case where both is passed,
-   * frame just finds the nearest end while frame_left the nearest start. */
-
-  best_dist = MAXFRAME * 2;
-
-  if (ed == NULL) {
-    return cfra;
-  }
-
-  for (seq = ed->seqbasep->first; seq; seq = seq->next) {
-    int i;
-
-    if (do_skip_mute && (seq->flag & SEQ_MUTE)) {
-      continue;
-    }
-
-    if (do_unselected && (seq->flag & SELECT)) {
-      continue;
-    }
-
-    if (do_center) {
-      seq_frames[0] = (seq->startdisp + seq->enddisp) / 2;
-      seq_frames_tot = 1;
-    }
-    else {
-      seq_frames[0] = seq->startdisp;
-      seq_frames[1] = seq->enddisp;
-
-      seq_frames_tot = 2;
-    }
-
-    for (i = 0; i < seq_frames_tot; i++) {
-      const int seq_frame = seq_frames[i];
-
-      dist = MAXFRAME * 2;
-
-      switch (side) {
-        case SEQ_SIDE_LEFT:
-          if (seq_frame < cfra) {
-            dist = cfra - seq_frame;
-          }
-          break;
-        case SEQ_SIDE_RIGHT:
-          if (seq_frame > cfra) {
-            dist = seq_frame - cfra;
-          }
-          break;
-        case SEQ_SIDE_BOTH:
-          dist = abs(seq_frame - cfra);
-          break;
-      }
-
-      if (dist < best_dist) {
-        best_frame = seq_frame;
-        best_dist = dist;
-      }
-    }
-  }
-
-  return best_frame;
-}
-
-static void sequencer_all_free_anim_ibufs(ListBase *seqbase, int cfra)
-{
-  for (Sequence *seq = seqbase->first; seq != NULL; seq = seq->next) {
-    if (seq->enddisp < cfra || seq->startdisp > cfra) {
-      BKE_sequence_free_anim(seq);
-    }
-    if (seq->type == SEQ_TYPE_META) {
-      sequencer_all_free_anim_ibufs(&seq->seqbase, cfra);
-    }
-  }
-}
-
-void BKE_sequencer_all_free_anim_ibufs(Scene *scene, int cfra)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  if (ed == NULL) {
-    return;
-  }
-  sequencer_all_free_anim_ibufs(&ed->seqbase, cfra);
-  BKE_sequencer_cache_cleanup(scene);
-}
-
-static bool sequencer_seq_generates_image(Sequence *seq)
-{
-  switch (seq->type) {
-    case SEQ_TYPE_IMAGE:
-    case SEQ_TYPE_SCENE:
-    case SEQ_TYPE_MOVIE:
-    case SEQ_TYPE_MOVIECLIP:
-    case SEQ_TYPE_MASK:
-    case SEQ_TYPE_COLOR:
-    case SEQ_TYPE_TEXT:
-      return true;
-  }
-  return false;
-}
-
-static Sequence *sequencer_check_scene_recursion(Scene *scene, ListBase *seqbase)
-{
-  LISTBASE_FOREACH (Sequence *, seq, seqbase) {
-    if (seq->type == SEQ_TYPE_SCENE && seq->scene == scene) {
-      return seq;
-    }
-
-    if (seq->type == SEQ_TYPE_META && sequencer_check_scene_recursion(scene, &seq->seqbase)) {
-      return seq;
-    }
-  }
-
-  return NULL;
-}
-
-bool BKE_sequencer_check_scene_recursion(Scene *scene, ReportList *reports)
-{
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
-  if (ed == NULL) {
-    return false;
-  }
-
-  Sequence *recursive_seq = sequencer_check_scene_recursion(scene, &ed->seqbase);
-
-  if (recursive_seq != NULL) {
-    BKE_reportf(reports,
-                RPT_WARNING,
-                "Recursion detected in video sequencer. Strip %s at frame %d will not be rendered",
-                recursive_seq->name + 2,
-                recursive_seq->startdisp);
-
-    LISTBASE_FOREACH (Sequence *, seq, &ed->seqbase) {
-      if (seq->type != SEQ_TYPE_SCENE && sequencer_seq_generates_image(seq)) {
-        /* There are other strips to render, so render them. */
-        return false;
-      }
-    }
-    /* No other strips to render - cancel operator. */
-    return true;
-  }
-
-  return false;
-}
-
-/* Check if "seq_main" (indirectly) uses strip "seq". */
-bool BKE_sequencer_render_loop_check(Sequence *seq_main, Sequence *seq)
-{
-  if (seq_main == seq) {
-    return true;
-  }
-
-  if ((seq_main->seq1 && BKE_sequencer_render_loop_check(seq_main->seq1, seq)) ||
-      (seq_main->seq2 && BKE_sequencer_render_loop_check(seq_main->seq2, seq)) ||
-      (seq_main->seq3 && BKE_sequencer_render_loop_check(seq_main->seq3, seq))) {
-    return true;
-  }
-
-  SequenceModifierData *smd;
-  for (smd = seq_main->modifiers.first; smd; smd = smd->next) {
-    if (smd->mask_sequence && BKE_sequencer_render_loop_check(smd->mask_sequence, seq)) {
-      return true;
-    }
-  }
-
-  return false;
-}
-
-static void sequencer_flag_users_for_removal(Scene *scene, ListBase *seqbase, Sequence *seq)
-{
-  LISTBASE_FOREACH (Sequence *, user_seq, seqbase) {
-    /* Look in metas for usage of seq. */
-    if (user_seq->type == SEQ_TYPE_META) {
-      sequencer_flag_users_for_removal(scene, &user_seq->seqbase, seq);
-    }
-
-    /* Clear seq from modifiers. */
-    SequenceModifierData *smd;
-    for (smd = user_seq->modifiers.first; smd; smd = smd->next) {
-      if (smd->mask_sequence == seq) {
-        smd->mask_sequence = NULL;
-      }
-    }
-
-    /* Remove effects, that use seq. */
-    if ((user_seq->seq1 && user_seq->seq1 == seq) || (user_seq->seq2 && user_seq->seq2 == seq) ||
-        (user_seq->seq3 && user_seq->seq3 == seq)) {
-      user_seq->flag |= SEQ_FLAG_DELETE;
-      /* Strips can be used as mask even if not in same seqbase. */
-      sequencer_flag_users_for_removal(scene, &scene->ed->seqbase, user_seq);
-    }
-  }
-}
-
-/* Flag seq and its users (effects) for removal. */
-void BKE_sequencer_flag_for_removal(Scene *scene, ListBase *seqbase, Sequence *seq)
-{
-  if (seq == NULL || (seq->flag & SEQ_FLAG_DELETE) != 0) {
-    return;
-  }
-
-  /* Flag and remove meta children. */
-  if (seq->type == SEQ_TYPE_META) {
-    LISTBASE_FOREACH (Sequence *, meta_child, &seq->seqbase) {
-      BKE_sequencer_flag_for_removal(scene, &seq->seqbase, meta_child);
-    }
-  }
-
-  seq->flag |= SEQ_FLAG_DELETE;
-  sequencer_flag_users_for_removal(scene, seqbase, seq);
-}
-
-/* Remove all flagged sequences, return true if sequence is removed. */
-void BKE_sequencer_remove_flagged_sequences(Scene *scene, ListBase *seqbase)
-{
-  LISTBASE_FOREACH_MUTABLE (Sequence *, seq, seqbase) {
-    if (seq->flag & SEQ_FLAG_DELETE) {
-      if (seq->type == SEQ_TYPE_META) {
-        BKE_sequencer_remove_flagged_sequences(scene, &seq->seqbase);
-      }
-      BLI_remlink(seqbase, seq);
-      BKE_sequence_free(scene, seq, true);
-    }
-  }
-}
-
-void BKE_sequencer_check_uuids_unique_and_report(const Scene *scene)
-{
-  if (scene->ed == NULL) {
-    return;
-  }
-
-  struct GSet *used_uuids = BLI_gset_new(
-      BLI_session_uuid_ghash_hash, BLI_session_uuid_ghash_compare, "sequencer used uuids");
-
-  const Sequence *sequence;
-  SEQ_ALL_BEGIN (scene->ed, sequence) {
-    const SessionUUID *session_uuid = &sequence->runtime.session_uuid;
-    if (!BLI_session_uuid_is_generated(session_uuid)) {
-      printf("Sequence %s does not have UUID generated.\n", sequence->name);
-      continue;
-    }
-
-    if (BLI_gset_lookup(used_uuids, session_uuid) != NULL) {
-      printf("Sequence %s has duplicate UUID generated.\n", sequence->name);
-      continue;
-    }
-
-    BLI_gset_insert(used_uuids, (void *)session_uuid);
-  }
-  SEQ_ALL_END;
-
-  BLI_gset_free(used_uuids, NULL);
-}