+void ff_copy_picture(Picture *dst, Picture *src);
+
+/**
+ * allocates a Picture
+ * The pixels are allocated/set by calling get_buffer() if shared=0
+ */
+int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
+
+extern const enum PixelFormat ff_pixfmt_list_420[];
+extern const enum PixelFormat ff_hwaccel_pixfmt_list_420[];