rv10 decoding fix

Originally committed as revision 3068 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263.c

@@ -4433,6 +4433,8 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
             }
           } else {
                 level = get_bits(&s->gb, 8);
+                if (level == 255)
+                    level = 128;
           }
         }else{
             level = get_bits(&s->gb, 8);

tests/ffmpeg.regression.ref

@@ -89,8 +89,8 @@ stddev:  8.87 PSNR:29.15 bytes:7602176
 stddev:  0.00 PSNR:99.99 bytes:7602176
 4fcfeba819177ad440bd16b0f095ba45 *./data/a-rv10.rm
  671633 ./data/a-rv10.rm
-9092124e1694baf96c1abc4fed26e072 *./data/out.yuv
-stddev: 14.17 PSNR:25.09 bytes:7602176
+bb31a08b20cfabc5332d11938e2f9352 *./data/out.yuv
+stddev:  8.09 PSNR:29.96 bytes:7602176
 89ad858355f9b0a92d024c5ba6e369dd *./data/a-asv1.avi
 2292416 ./data/a-asv1.avi
 b3e1696d73071c8f7f0ff4e10c1677ca *./data/out.yuv

tests/rotozoom.regression.ref

@@ -89,8 +89,8 @@ dde5895817ad9d219f79a52d0bdfb001 *./data/out.yuv
 stddev:  0.00 PSNR:99.99 bytes:7602176
 53a73b773cf790c9379c875ffa73bce5 *./data/a-rv10.rm
  157035 ./data/a-rv10.rm
-fea195d6d9b57893dc68d1b36229a299 *./data/out.yuv
-stddev: 13.52 PSNR:25.50 bytes:7602176
+dd1d762e16189ebc4e35edba973d409a *./data/out.yuv
+stddev:  5.52 PSNR:33.27 bytes:7602176
 9c4f5a4613a5595c90c6b99bf143b6a9 *./data/a-asv1.avi
 1433376 ./data/a-asv1.avi
 4251d7f496bbf362251b065e840a1b73 *./data/out.yuv