Load metadata from video files and expose via RNA

The MovieSequence and MovieClip classes now have a metadata() function
that exposes the `IDProperty *` holding the video metadata.

Part of: https://developer.blender.org/D2273

Reviewed by: @campbellbarton

3 files changed, 26 insertions, 0 deletions

diff --git a/source/blender/imbuf/IMB_metadata.h b/source/blender/imbuf/IMB_metadata.h
index 258d6bb1c5a..0a0d2c1faf6 100644
--- a/source/blender/imbuf/IMB_metadata.h
+++ b/source/blender/imbuf/IMB_metadata.h
@@ -73,5 +73,6 @@ bool IMB_metadata_get_field(struct IDProperty *metadata, const char *key, char *
 void IMB_metadata_set_field(struct IDProperty *metadata, const char *key, const char *value);
 
 void IMB_metadata_copy(struct ImBuf *dimb, struct ImBuf *simb);
+struct IDProperty *IMB_anim_load_metadata(struct anim *anim);
 
 #endif /* __IMB_METADATA_H__ */
diff --git a/source/blender/imbuf/intern/IMB_anim.h b/source/blender/imbuf/intern/IMB_anim.h
index c4c4f4405a5..6fa31e122cc 100644
--- a/source/blender/imbuf/intern/IMB_anim.h
+++ b/source/blender/imbuf/intern/IMB_anim.h
@@ -93,6 +93,7 @@
 
 struct _AviMovie;
 struct anim_index;
+struct IDProperty;
 
 struct anim {
 	int ib_flags;
@@ -158,6 +159,8 @@ struct anim {
 
 	char colorspace[64];
 	char suffix[64]; /* MAX_NAME - multiview */
+
+	struct IDProperty *metadata;
 };
 
 #endif
diff --git a/source/blender/imbuf/intern/anim_movie.c b/source/blender/imbuf/intern/anim_movie.c
index cc8a38d5bf4..f842b69418e 100644
--- a/source/blender/imbuf/intern/anim_movie.c
+++ b/source/blender/imbuf/intern/anim_movie.c
@@ -80,6 +80,7 @@
 
 #include "IMB_anim.h"
 #include "IMB_indexer.h"
+#include "IMB_metadata.h"
 
 #ifdef WITH_FFMPEG
 #  include "BKE_global.h"  /* ENDIAN_ORDER */
@@ -220,6 +221,7 @@ void IMB_free_anim(struct anim *anim)
 	free_anim_ffmpeg(anim);
 #endif
 	IMB_free_indices(anim);
+	IMB_metadata_free(anim->metadata);
 
 	MEM_freeN(anim);
 }
@@ -239,6 +241,26 @@ void IMB_close_anim_proxies(struct anim *anim)
 	IMB_free_indices(anim);
 }
 
+struct IDProperty *IMB_anim_load_metadata(struct anim *anim)
+{
+#ifdef WITH_FFMPEG
+	AVDictionaryEntry *entry = NULL;
+
+	BLI_assert(anim->pFormatCtx != NULL);
+	av_log(anim->pFormatCtx, AV_LOG_DEBUG, "METADATA FETCH\n");
+
+	while (true) {
+		entry = av_dict_get(anim->pFormatCtx->metadata, "", entry, AV_DICT_IGNORE_SUFFIX);
+		if (entry == NULL) break;
+
+		/* Delay creation of the property group until there is actual metadata to put in there. */
+		IMB_metadata_ensure(&anim->metadata);
+		IMB_metadata_set_field(anim->metadata, entry->key, entry->value);
+	}
+#endif
+	return anim->metadata;
+}
+
 struct anim *IMB_open_anim(const char *name, int ib_flags, int streamindex, char colorspace[IM_MAX_SPACE])
 {
 	struct anim *anim;