+/**
+ * Check whether the side-data of src contains a palette of
+ * size AVPALETTE_SIZE; if so, copy it to dst and return 1;
+ * else return 0.
+ * Also emit an error message upon encountering a palette
+ * with invalid size.
+ */
+int ff_copy_palette(void *dst, const AVPacket *src, void *logctx);
+
+/**
+ * Perform decoder initialization and validation.
+ * Called when opening the decoder, before the AVCodec.init() call.
+ */
+int ff_decode_preinit(AVCodecContext *avctx);
+