[FFmpeg-devel] [PATCH 3/7 v4] avutil/frame: use the same data pointer as the source entry when cloning side data

[James Almer <jamrial@gmail.com>]

src->data does not need to match src->buf->data

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavutil/frame.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/libavutil/frame.c b/libavutil/frame.c
index a165e56a64..d27998d1f4 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -744,13 +744,11 @@ AVBufferRef *av_frame_get_plane_buffer(const AVFrame *frame, int plane)
 static AVFrameSideData *add_side_data_from_buf(AVFrameSideData ***sd,
                                                int *nb_sd,
                                                enum AVFrameSideDataType type,
-                                               AVBufferRef *buf)
+                                               AVBufferRef *buf, uint8_t *data,
+                                               size_t size)
 {
     AVFrameSideData *ret, **tmp;
 
-    if (!buf)
-        return NULL;
-
     // *nb_sd + 1 needs to fit into an int and a size_t.
     if ((unsigned)*nb_sd >= FFMIN(INT_MAX, SIZE_MAX))
         return NULL;
@@ -765,8 +763,8 @@ static AVFrameSideData *add_side_data_from_buf(AVFrameSideData ***sd,
         return NULL;
 
     ret->buf = buf;
-    ret->data = ret->buf->data;
-    ret->size = buf->size;
+    ret->data = data;
+    ret->size = size;
     ret->type = type;
 
     (*sd)[(*nb_sd)++] = ret;
@@ -778,9 +776,13 @@ AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame *frame,
                                                  enum AVFrameSideDataType type,
                                                  AVBufferRef *buf)
 {
+    if (!buf)
+        return NULL;
+
     return
         add_side_data_from_buf(
-            &frame->side_data, &frame->nb_side_data, type, buf);
+            &frame->side_data, &frame->nb_side_data, type, buf,
+            buf->data, buf->size);
 }
 
 AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
@@ -827,7 +829,9 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
     }
 
     buf = av_buffer_alloc(size);
-    ret = add_side_data_from_buf(sd, nb_sd, type, buf);
+    if (!buf)
+        return NULL;
+    ret = add_side_data_from_buf(sd, nb_sd, type, buf, buf->data, size);
     if (!ret)
         av_buffer_unref(&buf);
 
@@ -873,8 +877,10 @@ AVFrameSideData *av_frame_side_data_add(AVFrameSideData ***sd, int *nb_sd,
 
     buf = (flags & AV_FRAME_SIDE_DATA_FLAG_NEW_REF) ?
            av_buffer_ref(*pbuf) : *pbuf;
+    if (!buf)
+        return NULL;
 
-    sd_dst = add_side_data_from_buf(sd, nb_sd, type, buf);
+    sd_dst = add_side_data_from_buf(sd, nb_sd, type, buf, buf->data, buf->size);
     if (!sd_dst) {
         if (flags & AV_FRAME_SIDE_DATA_FLAG_NEW_REF)
             av_buffer_unref(&buf);
@@ -933,7 +939,7 @@ int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
     if (!buf)
         return AVERROR(ENOMEM);
 
-    sd_dst = add_side_data_from_buf(sd, nb_sd, src->type, buf);
+    sd_dst = add_side_data_from_buf(sd, nb_sd, src->type, buf, src->data, src->size);
     if (!sd_dst) {
         av_buffer_unref(&buf);
         return AVERROR(ENOMEM);
-- 
2.44.0

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