libopenjpeg wrapper uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19100 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libopenjpeg.c

@@ -188,6 +188,6 @@ AVCodec libopenjpeg_decoder = {
     NULL,
     libopenjpeg_decode_close,
     libopenjpeg_decode_frame,
-    NULL,
+    CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
 } ;