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avcodec/scpr: fix decoding of prev+top-topleft prediction in keyframes

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2018-04-02 16:03:03 +02:00
parent f9d3841ae6
commit 324954cf96
1 changed files with 3 additions and 3 deletions
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6
libavcodec/scpr.c
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@ -446,13 +446,13 @@ static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
}
r = odst[(ly * linesize + lx) * 4] +
odst[((y * linesize + x) + off - z) * 4 + 4] -
odst[((y * linesize + x) + off) * 4 + 4] -
odst[((y * linesize + x) + off - z) * 4];
g = odst[(ly * linesize + lx) * 4 + 1] +
odst[((y * linesize + x) + off - z) * 4 + 5] -
odst[((y * linesize + x) + off) * 4 + 5] -
odst[((y * linesize + x) + off - z) * 4 + 1];
b = odst[(ly * linesize + lx) * 4 + 2] +
odst[((y * linesize + x) + off - z) * 4 + 6] -
odst[((y * linesize + x) + off) * 4 + 6] -
odst[((y * linesize + x) + off - z) * 4 + 2];
clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
dst[y * linesize + x] = clr;