[FFmpeg-devel] [PATCH v3 07/12] avutil/frame: add helper for extending a set of side data

["Jan Ekström" <jeebjp@gmail.com>]

---
 libavutil/frame.c | 23 +++++++++++++++++++++++
 libavutil/frame.h | 16 ++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/libavutil/frame.c b/libavutil/frame.c
index d8910a2120..04d56853f0 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -880,6 +880,29 @@ AVFrameSideData *av_side_data_set_new_item(AVFrameSideDataSet *set,
     return ret;
 }
 
+int av_side_data_set_extend(AVFrameSideDataSet *dst,
+                            const AVFrameSideDataSet src,
+                            unsigned int allow_duplicates)
+{
+    for (int i = 0; i < src.nb_sd; i++) {
+        const AVFrameSideData *sd_src = src.sd[i];
+        AVFrameSideData *sd_dst =
+            av_side_data_set_new_item(dst, sd_src->type,
+                                      sd_src->size,
+                                      allow_duplicates);
+        if (!sd_dst) {
+            av_side_data_set_uninit(dst);
+            return AVERROR(ENOMEM);
+        }
+
+        memcpy(sd_dst->data, sd_src->data, sd_src->size);
+
+        av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
+    }
+
+    return 0;
+}
+
 AVFrameSideData *av_side_data_set_get_item(const AVFrameSideDataSet set,
                                            enum AVFrameSideDataType type)
 {
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 0cafc9c51f..2413000c9a 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -1083,6 +1083,22 @@ AVFrameSideData *av_side_data_set_new_item(AVFrameSideDataSet *set,
                                            size_t size,
                                            unsigned int allow_duplicates);
 
+/**
+ * Add multiple side data entries to a set in one go.
+ *
+ * @param dst a set to which the side data should be added
+ * @param src a set from which the side data should be copied from
+ * @param allow_duplicates an unsigned integer noting whether duplicates are
+ *                         allowed or not. If duplicates are not allowed, all
+ *                         entries of the same side data type are first removed
+ *                         and freed before the new entry is added.
+ *
+ * @return negative error code on failure, >=0 on success.
+ */
+int av_side_data_set_extend(AVFrameSideDataSet *dst,
+                            const AVFrameSideDataSet src,
+                            unsigned int allow_duplicates);
+
 /**
  * Get a side data entry of a specific type from a set.
  *
-- 
2.41.0

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