mirror of https://git.ffmpeg.org/ffmpeg.git
VP8: fix broken sign bias code in MV pred
Apparently the official conformance test vectors don't test this feature, even though libvpx uses it. Originally committed as revision 24456 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -557,7 +557,8 @@ static void find_near_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
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if (mv) {\
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if (cur_sign_bias != sign_bias[edge_ref]) {\
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/* SWAR negate of the values in mv. */\
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mv = ((mv&0x80008000) + 0x00010001) ^ (mv&0x7fff7fff);\
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mv = ~mv;\
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mv = ((mv&0x7fff7fff) + 0x00010001) ^ (mv&0x80008000);\
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}\
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if (!n || mv != AV_RN32A(&near_mv[idx]))\
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AV_WN32A(&near_mv[++idx], mv);\
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