[FFmpeg-devel] [PATCH 1/6 v3] avutil/frame: add a flag to allow overwritting existing entries

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavutil/frame.c | 59 +++++++++++++++++++++++++++++++++++++++++++----
 libavutil/frame.h | 27 +++++++++++++++-------
 2 files changed, 74 insertions(+), 12 deletions(-)

diff --git a/libavutil/frame.c b/libavutil/frame.c
index ef1613c344..2e40018b83 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -799,12 +799,34 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
                                         enum AVFrameSideDataType type,
                                         size_t size, unsigned int flags)
 {
-    AVBufferRef     *buf = av_buffer_alloc(size);
+    const AVSideDataDescriptor *desc = av_frame_side_data_desc(type);
+    AVBufferRef     *buf;
     AVFrameSideData *ret = NULL;
 
     if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
         remove_side_data(sd, nb_sd, type);
+    if (!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) {
+        for (int i = 0; i < *nb_sd; i++) {
+            AVFrameSideData *entry = ((*sd)[i]);
+            if (entry->type != type)
+                continue;
+            if (!(flags & AV_FRAME_SIDE_DATA_FLAG_REPLACE))
+                return NULL;
+
+            buf = av_buffer_alloc(size);
+            if (!buf)
+                return NULL;
+
+            av_buffer_unref(&entry->buf);
+            av_dict_free(&entry->metadata);
+            entry->buf  = buf;
+            entry->data = buf->data;
+            entry->size = buf->size;
+            return 0;
+        }
+    }
 
+    buf = av_buffer_alloc(size);
     ret = add_side_data_from_buf(sd, nb_sd, type, buf);
     if (!ret)
         av_buffer_unref(&buf);
@@ -815,6 +837,7 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
 int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
                              const AVFrameSideData *src, unsigned int flags)
 {
+    const AVSideDataDescriptor *desc;
     AVBufferRef     *buf    = NULL;
     AVFrameSideData *sd_dst = NULL;
     int              ret    = AVERROR_BUG;
@@ -822,13 +845,41 @@ int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
     if (!sd || !src || !nb_sd || (*nb_sd && !*sd))
         return AVERROR(EINVAL);
 
+    desc = av_frame_side_data_desc(src->type);
+    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
+        remove_side_data(sd, nb_sd, src->type);
+    if (!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) {
+        for (int i = 0; i < *nb_sd; i++) {
+            AVFrameSideData *entry = ((*sd)[i]);
+            AVDictionary *dict = NULL;
+
+            if (entry->type != src->type)
+                continue;
+            if (!(flags & AV_FRAME_SIDE_DATA_FLAG_REPLACE))
+                return AVERROR(EEXIST);
+
+            ret = av_dict_copy(&dict, src->metadata, 0);
+            if (ret < 0)
+                return ret;
+
+            ret = av_buffer_replace(&entry->buf, src->buf);
+            if (ret < 0) {
+                av_dict_free(&dict);
+                return ret;
+            }
+
+            av_dict_free(&entry->metadata);
+            entry->metadata = dict;
+            entry->data     = src->data;
+            entry->size     = src->size;
+            return 0;
+        }
+    }
+
     buf = av_buffer_ref(src->buf);
     if (!buf)
         return AVERROR(ENOMEM);
 
-    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
-        remove_side_data(sd, nb_sd, src->type);
-
     sd_dst = add_side_data_from_buf(sd, nb_sd, src->type, buf);
     if (!sd_dst) {
         av_buffer_unref(&buf);
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 3b6d746a16..2ea129888e 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -1040,7 +1040,14 @@ const AVSideDataDescriptor *av_frame_side_data_desc(enum AVFrameSideDataType typ
  */
 void av_frame_side_data_free(AVFrameSideData ***sd, int *nb_sd);
 
+/**
+ * Remove existing entries before adding new ones.
+ */
 #define AV_FRAME_SIDE_DATA_FLAG_UNIQUE (1 << 0)
+/**
+ * Don't add a new entry if another of the same type exists.
+ */
+#define AV_FRAME_SIDE_DATA_FLAG_REPLACE (1 << 1)
 
 /**
  * Add new side data entry to an array.
@@ -1053,10 +1060,12 @@ void av_frame_side_data_free(AVFrameSideData ***sd, int *nb_sd);
  * @param size  size of the side data
  * @param flags Some combination of AV_FRAME_SIDE_DATA_FLAG_* flags, or 0.
  *
- * @return newly added side data on success, NULL on error. In case of
- *         AV_FRAME_SIDE_DATA_FLAG_UNIQUE being set, entries of matching
- *         AVFrameSideDataType will be removed before the addition is
- *         attempted.
+ * @return newly added side data on success, NULL on error.
+ * @note In case of AV_FRAME_SIDE_DATA_FLAG_UNIQUE being set, entries of
+ *       matching AVFrameSideDataType will be removed before the addition
+ *       is attempted.
+ * @note In case of AV_FRAME_SIDE_DATA_FLAG_REPLACE being set, if an
+ *       entry of the same type already exists, it will be replaced instead.
  */
 AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
                                         enum AVFrameSideDataType type,
@@ -1074,10 +1083,12 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
  *              for the buffer.
  * @param flags Some combination of AV_FRAME_SIDE_DATA_FLAG_* flags, or 0.
  *
- * @return negative error code on failure, >=0 on success. In case of
- *         AV_FRAME_SIDE_DATA_FLAG_UNIQUE being set, entries of matching
- *         AVFrameSideDataType will be removed before the addition is
- *         attempted.
+ * @return negative error code on failure, >=0 on success.
+ * @note In case of AV_FRAME_SIDE_DATA_FLAG_UNIQUE being set, entries of
+ *       matching AVFrameSideDataType will be removed before the addition
+ *       is attempted.
+ * @note In case of AV_FRAME_SIDE_DATA_FLAG_REPLACE being set, if an
+ *       entry of the same type already exists, it will be replaced instead.
  */
 int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
                              const AVFrameSideData *src, unsigned int flags);
-- 
2.44.0

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