diff --git a/libavcodec/dnxhddata.c b/libavcodec/dnxhddata.c
index 9e2e014b43..c433d9d13e 100644
--- a/libavcodec/dnxhddata.c
+++ b/libavcodec/dnxhddata.c
@@ -1027,6 +1027,14 @@ int ff_dnxhd_get_cid_table(int cid)
     return -1;
 }
 
+int avpriv_dnxhd_get_frame_size(int cid)
+{
+    int i = ff_dnxhd_get_cid_table(cid);
+    if (i<0)
+        return i;
+    return ff_dnxhd_cid_table[i].frame_size;
+}
+
 int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth)
 {
     int i, j;
diff --git a/libavcodec/dnxhddata.h b/libavcodec/dnxhddata.h
index 01c3f58fd9..f1a6ec7a8f 100644
--- a/libavcodec/dnxhddata.h
+++ b/libavcodec/dnxhddata.h
@@ -50,4 +50,6 @@ extern av_export const CIDEntry ff_dnxhd_cid_table[];
 int ff_dnxhd_get_cid_table(int cid);
 int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth);
 
+int avpriv_dnxhd_get_frame_size(int cid);
+
 #endif /* AVCODEC_DNXHDDATA_H */