avcodec/utils: document allocation requirement of extradata

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 2a4be2ca4f118ac868dc1ba09f08e20a16fd67c7..86a658a233f59052eff1d4fda119f652575097b9 100644 (file)
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1617,6 +1617,7 @@ typedef struct AVCodecContext {
      * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
      * than extradata_size to avoid problems if it is read with the bitstream reader.
      * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
+     * Must be allocated with the av_malloc() family of functions.
      * - encoding: Set/allocated/freed by libavcodec.
      * - decoding: Set/allocated/freed by user.
      */