avformat: add av_format_inject_global_side_data(), and disable it by default

After this commit applications needs to call av_format_inject_global_side_data()
or handle AVStream side data by some other means if they want it not to be lost.

This fixes a API incompatibility with libav.
libav API does not allow the data to be passed through AVPackets

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavformat/internal.h b/libavformat/internal.h
index f19cebf22e..e9e9293f87 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -52,6 +52,8 @@ struct AVFormatInternal {
      * Muxing only.
      */
     int nb_interleaved_streams;
+
+    int inject_global_side_data;
 };
 
 #ifdef __GNUC__