lavf/avformat: Add a warning that ff_const59 is not part of the public api.

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 8ed72af0f73596e6c9b9e61dca3aa7a244a453b7..73615cb122d4cb7479d2e798b14db228c02c1ca1 100644 (file)
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -532,6 +532,10 @@ typedef struct AVOutputFormat {
      * New public fields should be added right above.
      *****************************************************************
      */
+    /**
+     * The ff_const59 define is not part of the public API and will
+     * be removed without further warning.
+     */
 #if FF_API_AVIOFORMAT
 #define ff_const59
 #else