From 888852055c1b203f5a89c7e229f87f412a6624da Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Fri, 3 May 2019 17:47:44 +0200
Subject: Sound: Fix for being unable to jump to a frame during playback with
 A/V sync

---
 source/blender/blenkernel/BKE_sound.h       |  5 +++++
 source/blender/blenkernel/intern/sound.c    | 13 +++++++++++++
 source/blender/editors/animation/anim_ops.c |  2 +-
 source/blender/editors/screen/screen_ops.c  | 11 +++++------
 4 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/source/blender/blenkernel/BKE_sound.h b/source/blender/blenkernel/BKE_sound.h
index 9eebc6ab6be..f526dd579ce 100644
--- a/source/blender/blenkernel/BKE_sound.h
+++ b/source/blender/blenkernel/BKE_sound.h
@@ -32,6 +32,7 @@
 struct Main;
 struct Sequence;
 struct bSound;
+struct Depsgraph;
 
 typedef struct SoundWaveform {
   int length;
@@ -143,6 +144,10 @@ void BKE_sound_stop_scene(struct Scene *scene);
 
 void BKE_sound_seek_scene(struct Main *bmain, struct Scene *scene);
 
+/* Use this after original scene's frame has been changed. It will take care of doing all the
+ * updates required for BKE_sound_seek_scene(). */
+void BKE_sound_update_and_seek(struct Main *bmain, struct Depsgraph *depsgraph);
+
 float BKE_sound_sync_scene(struct Scene *scene);
 
 int BKE_sound_scene_playing(struct Scene *scene);
diff --git a/source/blender/blenkernel/intern/sound.c b/source/blender/blenkernel/intern/sound.c
index 9e5fb3dac63..04e34331826 100644
--- a/source/blender/blenkernel/intern/sound.c
+++ b/source/blender/blenkernel/intern/sound.c
@@ -1213,6 +1213,19 @@ char **BKE_sound_get_device_names(void)
 
 #endif /* WITH_AUDASPACE */
 
+void BKE_sound_update_and_seek(Main *bmain, Depsgraph *depsgraph)
+{
+  Scene *scene_orig = DEG_get_input_scene(depsgraph);
+  Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
+  /* NOTE: We don't do copy-on-write or anything like that here because we need to know scene's
+   * flags like "scrubbing" in the BKE_sound_seek_scene(). So we simply update frame to which
+   * seek needs to happen.
+   *
+   * TODO(sergey): Might change API so the frame is passes explicitly. */
+  scene_eval->r.cfra = scene_orig->r.cfra;
+  BKE_sound_seek_scene(bmain, scene_eval);
+}
+
 void BKE_sound_reset_scene_runtime(Scene *scene)
 {
   scene->sound_scene = NULL;
diff --git a/source/blender/editors/animation/anim_ops.c b/source/blender/editors/animation/anim_ops.c
index f95429fd47c..97ba7132c3d 100644
--- a/source/blender/editors/animation/anim_ops.c
+++ b/source/blender/editors/animation/anim_ops.c
@@ -116,7 +116,7 @@ static void change_frame_apply(bContext *C, wmOperator *op)
   FRAMENUMBER_MIN_CLAMP(CFRA);
 
   /* do updates */
-  BKE_sound_seek_scene(CTX_data_main(C), DEG_get_evaluated_scene(CTX_data_depsgraph(C)));
+  BKE_sound_update_and_seek(CTX_data_main(C), CTX_data_depsgraph(C));
   WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
 }
 
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index 8219a629b49..61fa05f243f 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -2771,7 +2771,7 @@ static int frame_offset_exec(bContext *C, wmOperator *op)
 
   areas_do_frame_follow(C, false);
 
-  BKE_sound_seek_scene(bmain, scene);
+  BKE_sound_update_and_seek(bmain, CTX_data_depsgraph(C));
 
   WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
 
@@ -2833,8 +2833,7 @@ static int frame_jump_exec(bContext *C, wmOperator *op)
 
     areas_do_frame_follow(C, true);
 
-    /* TODO(sergey): Make more reusable. */
-    BKE_sound_seek_scene(bmain, DEG_get_evaluated_scene(CTX_data_depsgraph(C)));
+    BKE_sound_update_and_seek(bmain, CTX_data_depsgraph(C));
 
     WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
   }
@@ -2950,7 +2949,7 @@ static int keyframe_jump_exec(bContext *C, wmOperator *op)
   else {
     areas_do_frame_follow(C, true);
 
-    BKE_sound_seek_scene(bmain, scene);
+    BKE_sound_update_and_seek(bmain, CTX_data_depsgraph(C));
 
     WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
 
@@ -3017,7 +3016,7 @@ static int marker_jump_exec(bContext *C, wmOperator *op)
 
     areas_do_frame_follow(C, true);
 
-    BKE_sound_seek_scene(bmain, scene);
+    BKE_sound_update_and_seek(bmain, CTX_data_depsgraph(C));
 
     WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
 
@@ -4404,7 +4403,7 @@ static int screen_animation_step(bContext *C, wmOperator *UNUSED(op), const wmEv
     }
 
     if (sad->flag & ANIMPLAY_FLAG_JUMPED) {
-      BKE_sound_seek_scene(bmain, scene_eval);
+      BKE_sound_update_and_seek(bmain, depsgraph);
 #ifdef PROFILE_AUDIO_SYNCH
       old_frame = CFRA;
 #endif
-- 
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