amv decoder uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19093 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/sp5xdec.c

@@ -216,5 +216,6 @@ AVCodec amv_decoder = {
     NULL,
     ff_mjpeg_decode_end,
     sp5x_decode_frame,
+    CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
 };