avutil/dovi_meta: add dolby vision extension blocks

As well as accessors plus a function for allocating this struct with
extension blocks,

Definitions generously taken from quietvoid/dovi_tool, which is
assembled as a collection of various patent fragments, as well as output
by the official Dolby Vision bitstream verifier tool.

1 files changed, 19 insertions, 3 deletions

diff --git a/libavutil/dovi_meta.c b/libavutil/dovi_meta.c
index 9c50da561e..dfa4a438ed 100644
--- a/libavutil/dovi_meta.c
+++ b/libavutil/dovi_meta.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <string.h>
+
 #include "dovi_meta.h"
 #include "mem.h"
 
@@ -39,6 +41,7 @@ typedef struct AVDOVIMetadataInternal {
     AVDOVIRpuDataHeader header;
     AVDOVIDataMapping mapping;
     AVDOVIColorMetadata color;
+    AVDOVIDmData ext_blocks[AV_DOVI_MAX_EXT_BLOCKS];
 } AVDOVIMetadataInternal;
 
 AVDOVIMetadata *av_dovi_metadata_alloc(size_t *size)
@@ -51,10 +54,23 @@ AVDOVIMetadata *av_dovi_metadata_alloc(size_t *size)
         *size = sizeof(*dovi);
 
     dovi->metadata = (struct AVDOVIMetadata) {
-        .header_offset  = offsetof(AVDOVIMetadataInternal, header),
-        .mapping_offset = offsetof(AVDOVIMetadataInternal, mapping),
-        .color_offset   = offsetof(AVDOVIMetadataInternal, color),
+        .header_offset      = offsetof(AVDOVIMetadataInternal, header),
+        .mapping_offset     = offsetof(AVDOVIMetadataInternal, mapping),
+        .color_offset       = offsetof(AVDOVIMetadataInternal, color),
+        .ext_block_offset   = offsetof(AVDOVIMetadataInternal, ext_blocks),
+        .ext_block_size     = sizeof(AVDOVIDmData),
     };
 
     return &dovi->metadata;
 }
+
+AVDOVIDmData *av_dovi_find_level(const AVDOVIMetadata *data, uint8_t level)
+{
+    for (int i = 0; i < data->num_ext_blocks; i++) {
+        AVDOVIDmData *ext = av_dovi_get_ext(data, i);
+        if (ext->level == level)
+            return ext;
+    }
+
+    return NULL;
+}