From b894bedeb3d47c258705af3e54718043f1bb0b9b Mon Sep 17 00:00:00 2001
From: Edward Hervey <edward@centricular.com>
Date: Thu, 22 Feb 2018 15:57:24 +0100
Subject: [PATCH] avvidec: Expose Closed Caption as GstVideoCaptionMeta

---
 ext/libav/gstavviddec.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/ext/libav/gstavviddec.c b/ext/libav/gstavviddec.c
index f9c6096406..63d74c851a 100644
--- a/ext/libav/gstavviddec.c
+++ b/ext/libav/gstavviddec.c
@@ -32,6 +32,7 @@
 #include <gst/video/gstvideodecoder.h>
 #include <gst/video/gstvideometa.h>
 #include <gst/video/gstvideopool.h>
+#include <gst/video/video-anc.h>
 
 #include "gstav.h"
 #include "gstavcodecmap.h"
@@ -1635,6 +1636,19 @@ gst_ffmpegviddec_video_frame (GstFFMpegVidDec * ffmpegdec,
           GST_VIDEO_BUFFER_FLAG_INTERLACED);
   }
 
+  {
+    AVFrameSideData *side_data =
+        av_frame_get_side_data (ffmpegdec->picture, AV_FRAME_DATA_A53_CC);
+    if (side_data) {
+      GST_LOG_OBJECT (ffmpegdec, "Found CC of size %d", side_data->size);
+      GST_MEMDUMP ("A53 CC", side_data->data, side_data->size);
+      out_frame->output_buffer =
+          gst_buffer_make_writable (out_frame->output_buffer);
+      gst_buffer_add_video_caption_meta (out_frame->output_buffer,
+          GST_VIDEO_CAPTION_TYPE_CEA708_RAW, side_data->data, side_data->size);
+    }
+  }
+
   /* cleaning time */
   /* so we decoded this frame, frames preceding it in decoding order
    * that still do not have a buffer allocated seem rather useless,