vc1parse: call vc1_init_common().

The parser uses VLC tables initialized in vc1_common_init(), therefore
we should call this function on parser init also.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

libavcodec/vc1.h

@@ -447,5 +447,6 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
 
 int ff_vc1_parse_frame_header    (VC1Context *v, GetBitContext *gb);
 int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
+int ff_vc1_init_common(VC1Context *v);
 
 #endif /* AVCODEC_VC1_H */

libavcodec/vc1_parser.c

@@ -188,7 +188,7 @@ static int vc1_parse_init(AVCodecParserContext *s)
 {
     VC1ParseContext *vpc = s->priv_data;
     vpc->v.s.slice_context_count = 1;
-    return 0;
+    return ff_vc1_init_common(&vpc->v);
 }
 
 AVCodecParser ff_vc1_parser = {

libavcodec/vc1dec.c

@@ -67,7 +67,7 @@ static const int offset_table2[9] = {  0,  1,  3,  7, 15, 31, 63, 127, 255 };
  * @param v The VC1Context to initialize
  * @return Status
  */
-static int vc1_init_common(VC1Context *v)
+int ff_vc1_init_common(VC1Context *v)
 {
     static int done = 0;
     int i = 0;
@@ -5274,7 +5274,7 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
         avctx->idct_algo = FF_IDCT_WMV2;
     }
 
-    if (vc1_init_common(v) < 0)
+    if (ff_vc1_init_common(v) < 0)
         return -1;
     ff_vc1dsp_init(&v->vc1dsp);