lavu/frame: Add Dolby Vision metadata side data type

In order to be able to extend this struct later (as the Dolby Vision RPU
evolves), all of the 'container' structs are considered extensible, and
the individual constituent fields must instead be accessed via offsets.
The precedent for this style of access is set in
<libavutil/detection_bbox.h>

Signed-off-by: Niklas Haas <git@haasn.dev>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/libavutil/dovi_meta.c b/libavutil/dovi_meta.c
index 7bd08f6c54..9c50da561e 100644
--- a/libavutil/dovi_meta.c
+++ b/libavutil/dovi_meta.c
@@ -33,3 +33,28 @@ AVDOVIDecoderConfigurationRecord *av_dovi_alloc(size_t *size)
 
     return dovi;
 }
+
+typedef struct AVDOVIMetadataInternal {
+    AVDOVIMetadata metadata;
+    AVDOVIRpuDataHeader header;
+    AVDOVIDataMapping mapping;
+    AVDOVIColorMetadata color;
+} AVDOVIMetadataInternal;
+
+AVDOVIMetadata *av_dovi_metadata_alloc(size_t *size)
+{
+    AVDOVIMetadataInternal *dovi = av_mallocz(sizeof(AVDOVIMetadataInternal));
+    if (!dovi)
+        return NULL;
+
+    if (size)
+        *size = sizeof(*dovi);
+
+    dovi->metadata = (struct AVDOVIMetadata) {
+        .header_offset  = offsetof(AVDOVIMetadataInternal, header),
+        .mapping_offset = offsetof(AVDOVIMetadataInternal, mapping),
+        .color_offset   = offsetof(AVDOVIMetadataInternal, color),
+    };
+
+    return &dovi->metadata;
+}