[FFmpeg-devel] [PATCH v4 08/13] avutil/frame: add helper for extending a set of side data

["Jan Ekström" <jeebjp@gmail.com>]

Additionally, extend the side data set FATE test to check for the
invalid use case of extending a set by itself.
---
 libavutil/frame.c               | 32 ++++++++++++++++++++++++++++++++
 libavutil/frame.h               | 15 +++++++++++++++
 libavutil/tests/side_data_set.c | 16 ++++++++++++++++
 tests/ref/fate/side_data_set    |  7 +++++++
 4 files changed, 70 insertions(+)

diff --git a/libavutil/frame.c b/libavutil/frame.c
index 5f74e0172b..898c749631 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -879,6 +879,38 @@ AVFrameSideData *av_frame_side_data_set_new_item(AVFrameSideDataSet *set,
     return ret;
 }
 
+int av_frame_side_data_set_extend(AVFrameSideDataSet *dst,
+                                  const AVFrameSideDataSet src,
+                                  unsigned int flags)
+{
+    if (src.nb_sd > 0 && src.nb_sd == dst->nb_sd &&
+        src.sd == dst->sd)
+        return AVERROR(EINVAL);
+
+    for (int i = 0; i < src.nb_sd; i++) {
+        const AVFrameSideData *sd_src = src.sd[i];
+        AVBufferRef           *buf    = av_buffer_ref(sd_src->buf);
+        AVFrameSideData       *sd_dst =
+            add_side_data_to_set_from_buf(dst, sd_src->type, buf);
+        if (!sd_dst) {
+            av_buffer_unref(&buf);
+            av_frame_side_data_set_uninit(dst);
+            return AVERROR(ENOMEM);
+        }
+
+        {
+            int ret = av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
+            if (ret < 0) {
+                av_frame_side_data_set_uninit(dst);
+                return ret;
+            }
+        }
+
+    }
+
+    return 0;
+}
+
 AVFrameSideData *av_frame_side_data_set_get_item(const AVFrameSideDataSet set,
                                                  enum AVFrameSideDataType type)
 {
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 8ecdf82f33..e16941c5a5 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -1085,6 +1085,21 @@ AVFrameSideData *av_frame_side_data_set_new_item(AVFrameSideDataSet *set,
                                                  size_t size,
                                                  unsigned int flags);
 
+/**
+ * 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 flags Some combination of AV_FRAME_SIDE_DATA_SET_FLAG_* flags, or 0.
+ *
+ * @return negative error code on failure, >=0 on success.
+ *
+ * @see av_frame_side_data_set_new_item regarding the flags.
+ */
+int av_frame_side_data_set_extend(AVFrameSideDataSet *dst,
+                                  const AVFrameSideDataSet src,
+                                  unsigned int flags);
+
 /**
  * Get a side data entry of a specific type from a set.
  *
diff --git a/libavutil/tests/side_data_set.c b/libavutil/tests/side_data_set.c
index 056d79f655..0c9ceed962 100644
--- a/libavutil/tests/side_data_set.c
+++ b/libavutil/tests/side_data_set.c
@@ -91,6 +91,22 @@ int main(void)
     puts("\nFinal state after a single 'no-duplicates' addition:");
     print_clls(set);
 
+    {
+        AVFrameSideDataSet dst_set = { 0 };
+        av_assert0(av_frame_side_data_set_extend(&dst_set, set, 0) >= 0);
+
+        puts("\nState of the copied set:");
+        print_clls(dst_set);
+
+        av_frame_side_data_set_uninit(&dst_set);
+    }
+
+    {
+        int ret = av_frame_side_data_set_extend(&set, set, 0);
+        printf("\nResult of trying to extend a set by itself: %s\n",
+               av_err2str(ret));
+    }
+
     av_frame_side_data_set_uninit(&set);
 
     return 0;
diff --git a/tests/ref/fate/side_data_set b/tests/ref/fate/side_data_set
index 7d8c684d8f..3050b31014 100644
--- a/tests/ref/fate/side_data_set
+++ b/tests/ref/fate/side_data_set
@@ -12,3 +12,10 @@ Final state after a single 'no-duplicates' addition:
 sd 0, Ambient viewing environment
 sd 1, Spherical Mapping
 sd 2, Content light level metadata: MaxCLL: 1337
+
+State of the copied set:
+sd 0, Ambient viewing environment
+sd 1, Spherical Mapping
+sd 2, Content light level metadata: MaxCLL: 1337
+
+Result of trying to extend a set by itself: Invalid argument
-- 
2.41.0

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