diff options
author | Sybren A. Stüvel <sybren@blender.org> | 2020-07-13 16:02:25 +0300 |
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committer | Sybren A. Stüvel <sybren@blender.org> | 2020-07-13 16:09:18 +0300 |
commit | b9f565881e15f13f5f30b6aca9fc656b3f92b900 (patch) | |
tree | a070bb7b6df13030a81c80a0cbf0d19784156723 /source/blender/blenkernel/intern | |
parent | 9db0c36af1140082b8e4bcf42564482eb477a682 (diff) |
VSE: Python API, allow creation of VSE Movie strips with missing file
It was already possible to create Sound and Image strips that reference
non-existing files. Now it's also possible to create Movie strips
referencing missing files via the Python API call
`Sequences.new_movie()`. In this case, the duration of the strip will be
set to 1 frame.
Note that this commit does not change anything in the user interface.
The Python API of the `MovieStrip` class is extended with a function
`reload_if_needed()`. This function only performs disk I/O if the movie
strip cannot produce frames, that is either when its filepath points to
a non-existing file, or when the video sequence editor has not been
shown yet (for example because it is in an inactive workspace).
This allows for the following:
```
import bpy
scene = bpy.context.scene
vse = scene.sequence_editor_create()
filepath = bpy.path.abspath('//demo.mkv')
strip = vse.sequences.new_movie("movie", filepath,
channel=2,
frame_start=47,
file_must_exist=False)
strip.frame_final_end = 327
```
This will create a new movie strip, even when `demo.mkv` does not exist.
Once `demo.mkv` has appeared at the expected location, either
`strip.reload_if_needed()` or `strip.filepath = strip.filepath` will
load it.
Differential Revision: https://developer.blender.org/D8257
Reviewed By: Sergey, ISS
Diffstat (limited to 'source/blender/blenkernel/intern')
-rw-r--r-- | source/blender/blenkernel/intern/sequencer.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c index bde94f366b9..7339c887151 100644 --- a/source/blender/blenkernel/intern/sequencer.c +++ b/source/blender/blenkernel/intern/sequencer.c @@ -1090,6 +1090,64 @@ void BKE_sequence_reload_new_file(Main *bmain, Scene *scene, Sequence *seq, cons 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") */ |