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Code Issues Releases Activity

avcodec/mjpegdec: fix yuv ljpeg prediction 5/6/7 with point transforms

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Fixes Ticket2826

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-05 01:25:59 +02:00
parent 4ced30908f
commit 38f8640df8
1 changed files with 4 additions and 4 deletions
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8
libavcodec/mjpegdec.c
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@ -944,7 +944,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
if (s->interlaced && s->bottom_field)
ptr += linesize >> 1;
pred &= (-1)<<(8-s->bits);
pred &= (-1)<<(8 - s->bits + point_transform);
*ptr= pred + (dc << point_transform);
}else{
ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
@ -964,7 +964,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
if (s->interlaced && s->bottom_field)
ptr16 += linesize >> 1;
pred &= (-1)<<(16-s->bits);
pred &= (-1)<<(16 - s->bits + point_transform);
*ptr16= pred + (dc << point_transform);
}
if (++x == h) {
@ -1000,13 +1000,13 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
(h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
pred &= (-1)<<(8-s->bits);
pred &= (-1)<<(8 - s->bits + point_transform);
*ptr = pred + (dc << point_transform);
}else{
ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
pred &= (-1)<<(16-s->bits);
pred &= (-1)<<(16 - s->bits + point_transform);
*ptr16= pred + (dc << point_transform);
}