avcodec/v210enc: Pass through Active Format Description (AFD) data

When encoding to V210, make sure the AFD side data makes it through
in the resulting AVPacket.  This is needed so the decklink output
module can put out AFD when in 10-bit mode.
Signed-off-by: Devin Heitmueller <dheitmueller@ltnglobal.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavcodec/v210enc.c

@@ -242,6 +242,14 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         memcpy(buf, side_data->data, side_data->size);
     }
 
+    side_data = av_frame_get_side_data(pic, AV_FRAME_DATA_AFD);
+    if (side_data && side_data->size) {
+        uint8_t *buf = av_packet_new_side_data(pkt, AV_PKT_DATA_AFD, side_data->size);
+        if (!buf)
+            return AVERROR(ENOMEM);
+        memcpy(buf, side_data->data, side_data->size);
+    }
+
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
     return 0;