VSE: Automatic proxy building

Build proxies automatically when added to sequencer timeline and when
switching preview size.

This behavior can be disabled in user preferences.

Reviewed By: sergey, fsiddi

Differential Revision: https://developer.blender.org/D10363

10 files changed, 307 insertions, 104 deletions

diff --git a/source/blender/blenloader/intern/versioning_userdef.c b/source/blender/blenloader/intern/versioning_userdef.c
index ae22c5151cc..8cbedb05931 100644
--- a/source/blender/blenloader/intern/versioning_userdef.c
+++ b/source/blender/blenloader/intern/versioning_userdef.c
@@ -845,6 +845,14 @@ void blo_do_versions_userdef(UserDef *userdef)
     userdef->experimental.use_asset_browser = true;
   }
 
+  if (!USER_VERSION_ATLEAST(293, 12)) {
+    if (userdef->gizmo_size_navigate_v3d == 0) {
+      userdef->gizmo_size_navigate_v3d = 80;
+    }
+
+    userdef->sequencer_proxy_setup = USER_SEQ_PROXY_SETUP_AUTOMATIC;
+  }
+
   /**
    * Versioning code until next subversion bump goes here.
    *
@@ -856,9 +864,6 @@ void blo_do_versions_userdef(UserDef *userdef)
    */
   {
     /* Keep this block, even when empty. */
-    if (userdef->gizmo_size_navigate_v3d == 0) {
-      userdef->gizmo_size_navigate_v3d = 80;
-    }
   }
 
   LISTBASE_FOREACH (bTheme *, btheme, &userdef->themes) {
diff --git a/source/blender/editors/space_sequencer/sequencer_add.c b/source/blender/editors/space_sequencer/sequencer_add.c
index 844dbe6a0a5..63946778a19 100644
--- a/source/blender/editors/space_sequencer/sequencer_add.c
+++ b/source/blender/editors/space_sequencer/sequencer_add.c
@@ -29,6 +29,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "BLI_blenlib.h"
+#include "BLI_ghash.h"
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
 
@@ -37,8 +38,10 @@
 #include "DNA_mask_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_sound_types.h"
+#include "DNA_space_types.h"
 
 #include "BKE_context.h"
+#include "BKE_global.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_mask.h"
@@ -55,6 +58,7 @@
 
 #include "SEQ_add.h"
 #include "SEQ_effects.h"
+#include "SEQ_proxy.h"
 #include "SEQ_relations.h"
 #include "SEQ_render.h"
 #include "SEQ_select.h"
@@ -548,6 +552,55 @@ static bool sequencer_add_draw_check_fn(PointerRNA *UNUSED(ptr),
   return !(STR_ELEM(prop_id, "filepath", "directory", "filename"));
 }
 
+/* Strips are added in context of timeline which has different preview size than actual preview. We
+ * must search for preview area. In most cases there will be only one preview area, but there can
+ * be more with different preview sizes. */
+static IMB_Proxy_Size seq_get_proxy_size_flags(bContext *C)
+{
+  bScreen *screen = CTX_wm_screen(C);
+  IMB_Proxy_Size proxy_sizes = 0;
+  LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
+    LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
+      switch (sl->spacetype) {
+        case SPACE_SEQ: {
+          SpaceSeq *sseq = (SpaceSeq *)sl;
+          if (!ELEM(sseq->view, SEQ_VIEW_PREVIEW, SEQ_VIEW_SEQUENCE_PREVIEW)) {
+            continue;
+          }
+          proxy_sizes |= SEQ_rendersize_to_proxysize(sseq->render_size);
+        }
+      }
+    }
+  }
+  return proxy_sizes;
+}
+
+static void seq_build_proxy(bContext *C, Sequence *seq)
+{
+  if (U.sequencer_proxy_setup == USER_SEQ_PROXY_SETUP_AUTOMATIC) {
+    return;
+  }
+
+  /* Enable and set proxy size. */
+  SEQ_proxy_set(seq, true);
+  seq->strip->proxy->build_size_flags = seq_get_proxy_size_flags(C);
+  seq->strip->proxy->build_flags |= SEQ_PROXY_SKIP_EXISTING;
+
+  /* Build proxy. */
+  GSet *file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");
+  wmJob *wm_job = ED_seq_proxy_wm_job_get(C);
+  ProxyJob *pj = ED_seq_proxy_job_get(C, wm_job);
+  SEQ_proxy_rebuild_context(pj->main, pj->depsgraph, pj->scene, seq, file_list, &pj->queue);
+  BLI_gset_free(file_list, MEM_freeN);
+
+  if (!WM_jobs_is_running(wm_job)) {
+    G.is_break = false;
+    WM_jobs_start(CTX_wm_manager(C), wm_job);
+  }
+
+  ED_area_tag_redraw(CTX_wm_area(C));
+}
+
 static void sequencer_add_movie_multiple_strips(bContext *C,
                                                 wmOperator *op,
                                                 SeqLoadData *load_data)
@@ -578,6 +631,7 @@ static void sequencer_add_movie_multiple_strips(bContext *C,
       load_data->start_frame += seq_movie->enddisp - seq_movie->startdisp;
       seq_load_apply_generic_options(C, op, seq_sound);
       seq_load_apply_generic_options(C, op, seq_movie);
+      seq_build_proxy(C, seq_movie);
     }
   }
   RNA_END;
@@ -604,6 +658,7 @@ static bool sequencer_add_movie_single_strip(bContext *C, wmOperator *op, SeqLoa
   }
   seq_load_apply_generic_options(C, op, seq_sound);
   seq_load_apply_generic_options(C, op, seq_movie);
+  seq_build_proxy(C, seq_movie);
 
   return true;
 }
diff --git a/source/blender/editors/space_sequencer/sequencer_proxy.c b/source/blender/editors/space_sequencer/sequencer_proxy.c
index 24fa4ad7a17..e44afde371a 100644
--- a/source/blender/editors/space_sequencer/sequencer_proxy.c
+++ b/source/blender/editors/space_sequencer/sequencer_proxy.c
@@ -49,98 +49,25 @@
 /* Own include. */
 #include "sequencer_intern.h"
 
-/*--------------------------------------------------------------------*/
-/** \name Proxy Job Manager
+/* -------------------------------------------------------------------- */
+/** \name Rebuild Proxy and Timecode Indices Operator
  * \{ */
 
-typedef struct ProxyBuildJob {
-  struct Main *main;
-  struct Depsgraph *depsgraph;
-  Scene *scene;
-  ListBase queue;
-  int stop;
-} ProxyJob;
-
-static void proxy_freejob(void *pjv)
-{
-  ProxyJob *pj = pjv;
-
-  BLI_freelistN(&pj->queue);
-
-  MEM_freeN(pj);
-}
-
-/* Only this runs inside thread. */
-static void proxy_startjob(void *pjv, short *stop, short *do_update, float *progress)
-{
-  ProxyJob *pj = pjv;
-  LinkData *link;
-
-  for (link = pj->queue.first; link; link = link->next) {
-    struct SeqIndexBuildContext *context = link->data;
-
-    SEQ_proxy_rebuild(context, stop, do_update, progress);
-
-    if (*stop) {
-      pj->stop = 1;
-      fprintf(stderr, "Canceling proxy rebuild on users request...\n");
-      break;
-    }
-  }
-}
-
-static void proxy_endjob(void *pjv)
-{
-  ProxyJob *pj = pjv;
-  Editing *ed = SEQ_editing_get(pj->scene, false);
-  LinkData *link;
-
-  for (link = pj->queue.first; link; link = link->next) {
-    SEQ_proxy_rebuild_finish(link->data, pj->stop);
-  }
-
-  SEQ_relations_free_imbuf(pj->scene, &ed->seqbase, false);
-
-  WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, pj->scene);
-}
-
 static void seq_proxy_build_job(const bContext *C, ReportList *reports)
 {
-  wmJob *wm_job;
-  ProxyJob *pj;
-  struct Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
   Scene *scene = CTX_data_scene(C);
   Editing *ed = SEQ_editing_get(scene, false);
   ScrArea *area = CTX_wm_area(C);
   Sequence *seq;
-  GSet *file_list;
 
   if (ed == NULL) {
     return;
   }
 
-  wm_job = WM_jobs_get(CTX_wm_manager(C),
-                       CTX_wm_window(C),
-                       scene,
-                       "Building Proxies",
-                       WM_JOB_PROGRESS,
-                       WM_JOB_TYPE_SEQ_BUILD_PROXY);
-
-  pj = WM_jobs_customdata_get(wm_job);
-
-  if (!pj) {
-    pj = MEM_callocN(sizeof(ProxyJob), "proxy rebuild job");
-
-    pj->depsgraph = depsgraph;
-    pj->scene = scene;
-    pj->main = CTX_data_main(C);
+  wmJob *wm_job = ED_seq_proxy_wm_job_get(C);
+  ProxyJob *pj = ED_seq_proxy_job_get(C, wm_job);
 
-    WM_jobs_customdata_set(wm_job, pj, proxy_freejob);
-    WM_jobs_timer(wm_job, 0.1, NC_SCENE | ND_SEQUENCER, NC_SCENE | ND_SEQUENCER);
-    WM_jobs_callbacks(wm_job, proxy_startjob, NULL, NULL, proxy_endjob);
-  }
-
-  file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");
+  GSet *file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");
   bool selected = false; /* Check for no selected strips */
 
   SEQ_CURRENT_BEGIN (ed, seq) {
@@ -182,12 +109,6 @@ static void seq_proxy_build_job(const bContext *C, ReportList *reports)
   ED_area_tag_redraw(area);
 }
 
-/** \} */
-
-/* -------------------------------------------------------------------- */
-/** \name Rebuild Proxy and Timecode Indices Operator
- * \{ */
-
 static int sequencer_rebuild_proxy_invoke(bContext *C,
                                           wmOperator *op,
                                           const wmEvent *UNUSED(event))
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index 233c476cbf2..7c92317b1b2 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -921,7 +921,7 @@ typedef struct UserDef {
   int sequencer_disk_cache_compression; /* eUserpref_DiskCacheCompression */
   int sequencer_disk_cache_size_limit;
   short sequencer_disk_cache_flag;
-  char _pad5[2];
+  short sequencer_proxy_setup; /* eUserpref_SeqProxySetup */
 
   float collection_instance_empty_size;
   char _pad10[3];
@@ -1386,6 +1386,11 @@ typedef enum eUserpref_DiskCacheCompression {
   USER_SEQ_DISK_CACHE_COMPRESSION_HIGH = 2,
 } eUserpref_DiskCacheCompression;
 
+typedef enum eUserpref_SeqProxySetup {
+  USER_SEQ_PROXY_SETUP_MANUAL = 0,
+  USER_SEQ_PROXY_SETUP_AUTOMATIC = 1,
+} eUserpref_SeqProxySetup;
+
 /* Locale Ids. Auto will try to get local from OS. Our default is English though. */
 /** #UserDef.language */
 enum {
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 39e6c632b21..0ddc9a61cad 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -56,7 +56,9 @@
 
 #include "rna_internal.h"
 
+#include "SEQ_proxy.h"
 #include "SEQ_relations.h"
+#include "SEQ_sequencer.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -2236,6 +2238,48 @@ static void rna_SequenceEditor_update_cache(Main *UNUSED(bmain),
   SEQ_cache_cleanup(scene);
 }
 
+static void seq_build_proxy(bContext *C, PointerRNA *ptr)
+{
+  if (U.sequencer_proxy_setup != USER_SEQ_PROXY_SETUP_AUTOMATIC) {
+    return;
+  }
+
+  SpaceSeq *sseq = ptr->data;
+  Scene *scene = CTX_data_scene(C);
+  ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene, false));
+
+  GSet *file_list = BLI_gset_new(BLI_ghashutil_strhash_p, BLI_ghashutil_strcmp, "file list");
+  wmJob *wm_job = ED_seq_proxy_wm_job_get(C);
+  ProxyJob *pj = ED_seq_proxy_job_get(C, wm_job);
+
+  LISTBASE_FOREACH (Sequence *, seq, seqbase) {
+    if (seq->type != SEQ_TYPE_MOVIE) {
+      continue;
+    }
+
+    /* Add new proxy size. */
+    seq->strip->proxy->build_size_flags |= SEQ_rendersize_to_proxysize(sseq->render_size);
+
+    /* Build proxy. */
+    SEQ_proxy_rebuild_context(pj->main, pj->depsgraph, pj->scene, seq, file_list, &pj->queue);
+  }
+
+  BLI_gset_free(file_list, MEM_freeN);
+
+  if (!WM_jobs_is_running(wm_job)) {
+    G.is_break = false;
+    WM_jobs_start(CTX_wm_manager(C), wm_job);
+  }
+
+  ED_area_tag_redraw(CTX_wm_area(C));
+}
+
+static void rna_SequenceEditor_render_size_update(bContext *C, PointerRNA *ptr)
+{
+  seq_build_proxy(C, ptr);
+  rna_SequenceEditor_update_cache(CTX_data_main(C), CTX_data_scene(C), ptr);
+}
+
 static void rna_Sequencer_view_type_update(Main *UNUSED(bmain),
                                            Scene *UNUSED(scene),
                                            PointerRNA *ptr)
@@ -5325,8 +5369,12 @@ static void rna_def_space_sequencer(BlenderRNA *brna)
   prop = RNA_def_property(srna, "proxy_render_size", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_sdna(prop, NULL, "render_size");
   RNA_def_property_enum_items(prop, proxy_render_size_items);
-  RNA_def_property_ui_text(prop, "Preview Size", "");
-  RNA_def_property_update(prop, NC_SPACE | ND_SPACE_SEQUENCER, "rna_SequenceEditor_update_cache");
+  RNA_def_property_ui_text(prop,
+                           "Proxy Render Size",
+                           "Display preview using full resolution or different proxy resolutions");
+  RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
+  RNA_def_property_update(
+      prop, NC_SPACE | ND_SPACE_SEQUENCER, "rna_SequenceEditor_render_size_update");
 
   prop = RNA_def_property(srna, "use_proxies", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", SEQ_USE_PROXIES);
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index e07d46dbe3e..648b429acf6 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -5378,6 +5378,16 @@ static void rna_def_userdef_system(BlenderRNA *brna)
       {0, NULL, 0, NULL, NULL},
   };
 
+  static const EnumPropertyItem seq_proxy_setup_options[] = {
+      {USER_SEQ_PROXY_SETUP_MANUAL, "MANUAL", 0, "Manual", "Set up proxies manually"},
+      {USER_SEQ_PROXY_SETUP_AUTOMATIC,
+       "AUTOMATIC",
+       0,
+       "Automatic",
+       "Build proxies for added movie and image strips in each preview size"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
   srna = RNA_def_struct(brna, "PreferencesSystem", NULL);
   RNA_def_struct_sdna(srna, "UserDef");
   RNA_def_struct_nested(brna, srna, "Preferences");
@@ -5445,6 +5455,13 @@ static void rna_def_userdef_system(BlenderRNA *brna)
       "Disk Cache Compression Level",
       "Smaller compression will result in larger files, but less decoding overhead");
 
+  /* Sequencer proxy setup */
+
+  prop = RNA_def_property(srna, "sequencer_proxy_setup", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, seq_proxy_setup_options);
+  RNA_def_property_enum_sdna(prop, NULL, "sequencer_proxy_setup");
+  RNA_def_property_ui_text(prop, "Proxy setup", "When and how proxies are created");
+
   prop = RNA_def_property(srna, "scrollback", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, NULL, "scrollback");
   RNA_def_property_range(prop, 32, 32768);
diff --git a/source/blender/sequencer/CMakeLists.txt b/source/blender/sequencer/CMakeLists.txt
index 82e303806b3..9d9553ed858 100644
--- a/source/blender/sequencer/CMakeLists.txt
+++ b/source/blender/sequencer/CMakeLists.txt
@@ -72,6 +72,7 @@ set(SRC
   intern/multiview.h
   intern/prefetch.c
   intern/prefetch.h
+  intern/proxy_job.c
   intern/proxy.c
   intern/proxy.h
   intern/render.c
diff --git a/source/blender/sequencer/SEQ_proxy.h b/source/blender/sequencer/SEQ_proxy.h
index 859eac90609..b06adef2802 100644
--- a/source/blender/sequencer/SEQ_proxy.h
+++ b/source/blender/sequencer/SEQ_proxy.h
@@ -53,6 +53,17 @@ bool SEQ_can_use_proxy(const struct SeqRenderData *context, struct Sequence *seq
 int SEQ_rendersize_to_proxysize(int render_size);
 double SEQ_rendersize_to_scale_factor(int size);
 
+typedef struct ProxyBuildJob {
+  struct Main *main;
+  struct Depsgraph *depsgraph;
+  struct Scene *scene;
+  struct ListBase queue;
+  int stop;
+} ProxyJob;
+
+struct wmJob *ED_seq_proxy_wm_job_get(const struct bContext *C);
+ProxyJob *ED_seq_proxy_job_get(const struct bContext *C, struct wmJob *wm_job);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/blender/sequencer/intern/proxy.c b/source/blender/sequencer/intern/proxy.c
index 562cd07ddee..a0e6bc7f4f1 100644
--- a/source/blender/sequencer/intern/proxy.c
+++ b/source/blender/sequencer/intern/proxy.c
@@ -55,6 +55,7 @@
 #include "IMB_metadata.h"
 
 #include "SEQ_proxy.h"
+#include "SEQ_relations.h"
 #include "SEQ_render.h"
 #include "SEQ_sequencer.h"
 
@@ -395,6 +396,17 @@ static int seq_proxy_context_count(Sequence *seq, Scene *scene)
   return num_views;
 }
 
+static bool seq_proxy_need_rebuild(Sequence *seq, struct anim *anim)
+{
+  if ((seq->strip->proxy->build_flags & SEQ_PROXY_SKIP_EXISTING) == 0) {
+    return true;
+  }
+
+  IMB_Proxy_Size required_proxies = seq->strip->proxy->build_size_flags;
+  IMB_Proxy_Size built_proxies = IMB_anim_proxy_get_existing(anim);
+  return (required_proxies & built_proxies) != required_proxies;
+}
+
 bool SEQ_proxy_rebuild_context(Main *bmain,
                                Depsgraph *depsgraph,
                                Scene *scene,
@@ -423,6 +435,16 @@ bool SEQ_proxy_rebuild_context(Main *bmain,
       continue;
     }
 
+    /* Check if proxies are already built here, because actually opening anims takes a lot of
+     * time. */
+    seq_open_anim_file(scene, seq, false);
+    StripAnim *sanim = BLI_findlink(&seq->anims, i);
+    if (sanim->anim && !seq_proxy_need_rebuild(seq, sanim->anim)) {
+      continue;
+    }
+
+    SEQ_relations_sequence_free_anim(seq);
+
     context = MEM_callocN(sizeof(SeqIndexBuildContext), "seq proxy rebuild context");
 
     nseq = SEQ_sequence_dupli_recursive(scene, scene, NULL, seq, 0);
@@ -441,28 +463,25 @@ bool SEQ_proxy_rebuild_context(Main *bmain,
     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;
-      }
+      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) {
+      SEQ_proxy_rebuild_finish(context, false);
+      return false;
     }
 
     link = BLI_genericNodeN(context);
     BLI_addtail(queue, link);
   }
+
   return true;
 }
 
diff --git a/source/blender/sequencer/intern/proxy_job.c b/source/blender/sequencer/intern/proxy_job.c
new file mode 100644
index 00000000000..aea66da4cc4
--- /dev/null
+++ b/source/blender/sequencer/intern/proxy_job.c
@@ -0,0 +1,121 @@
+/*
+ * 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 "MEM_guardedalloc.h"
+
+#include "BLI_blenlib.h"
+#include "BLI_ghash.h"
+#include "BLI_timecode.h"
+
+#include "DNA_scene_types.h"
+#include "DNA_sequence_types.h"
+
+#include "BKE_context.h"
+#include "BKE_global.h"
+#include "BKE_main.h"
+#include "BKE_report.h"
+
+#include "SEQ_iterator.h"
+#include "SEQ_proxy.h"
+#include "SEQ_relations.h"
+#include "SEQ_sequencer.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "RNA_define.h"
+
+static void proxy_freejob(void *pjv)
+{
+  ProxyJob *pj = pjv;
+
+  BLI_freelistN(&pj->queue);
+
+  MEM_freeN(pj);
+}
+
+/* Only this runs inside thread. */
+static void proxy_startjob(void *pjv, short *stop, short *do_update, float *progress)
+{
+  ProxyJob *pj = pjv;
+  LinkData *link;
+
+  for (link = pj->queue.first; link; link = link->next) {
+    struct SeqIndexBuildContext *context = link->data;
+
+    SEQ_proxy_rebuild(context, stop, do_update, progress);
+
+    if (*stop) {
+      pj->stop = 1;
+      fprintf(stderr, "Canceling proxy rebuild on users request...\n");
+      break;
+    }
+  }
+}
+
+static void proxy_endjob(void *pjv)
+{
+  ProxyJob *pj = pjv;
+  Editing *ed = SEQ_editing_get(pj->scene, false);
+  LinkData *link;
+
+  for (link = pj->queue.first; link; link = link->next) {
+    SEQ_proxy_rebuild_finish(link->data, pj->stop);
+  }
+
+  SEQ_relations_free_imbuf(pj->scene, &ed->seqbase, false);
+
+  WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, pj->scene);
+}
+
+ProxyJob *ED_seq_proxy_job_get(const bContext *C, wmJob *wm_job)
+{
+  Scene *scene = CTX_data_scene(C);
+  struct Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
+  ProxyJob *pj = WM_jobs_customdata_get(wm_job);
+  if (!pj) {
+    pj = MEM_callocN(sizeof(ProxyJob), "proxy rebuild job");
+    pj->depsgraph = depsgraph;
+    pj->scene = scene;
+    pj->main = CTX_data_main(C);
+    WM_jobs_customdata_set(wm_job, pj, proxy_freejob);
+    WM_jobs_timer(wm_job, 0.1, NC_SCENE | ND_SEQUENCER, NC_SCENE | ND_SEQUENCER);
+    WM_jobs_callbacks(wm_job, proxy_startjob, NULL, NULL, proxy_endjob);
+  }
+  return pj;
+}
+
+struct wmJob *ED_seq_proxy_wm_job_get(const bContext *C)
+{
+  Scene *scene = CTX_data_scene(C);
+  wmJob *wm_job = WM_jobs_get(CTX_wm_manager(C),
+                              CTX_wm_window(C),
+                              scene,
+                              "Building Proxies",
+                              WM_JOB_PROGRESS,
+                              WM_JOB_TYPE_SEQ_BUILD_PROXY);
+  return wm_job;
+}