vc1 and wmv3 decoders use MPV_frame_start which uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19111 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vc1.c

@@ -4272,7 +4272,7 @@ AVCodec vc1_decoder = {
     NULL,
     vc1_decode_end,
     vc1_decode_frame,
-    CODEC_CAP_DELAY,
+    CODEC_CAP_DR1 | CODEC_CAP_DELAY,
     NULL,
     .long_name = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),
     .pix_fmts = ff_hwaccel_pixfmt_list_420
@@ -4287,7 +4287,7 @@ AVCodec wmv3_decoder = {
     NULL,
     vc1_decode_end,
     vc1_decode_frame,
-    CODEC_CAP_DELAY,
+    CODEC_CAP_DR1 | CODEC_CAP_DELAY,
     NULL,
     .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),
     .pix_fmts = ff_hwaccel_pixfmt_list_420