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j2kdec: Try to fix 8bps output case 

Ive no test samples for which this makes a difference but it
matches the 16bit implementation.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-28 17:11:12 +02:00
parent ced0307ea9
commit f0a2c8285a
1 changed files with 4 additions and 6 deletions
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10
libavcodec/j2kdec.c
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@ -933,12 +933,10 @@ static int decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
dst = line + x * s->ncomponents + compno;
for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
*src[compno] += 1 << (s->cbps[compno]-1);
if (*src[compno] < 0)
*src[compno] = 0;
else if (*src[compno] >= (1 << s->cbps[compno]))
*src[compno] = (1 << s->cbps[compno]) - 1;
*dst = *src[compno]++;
int val = *src[compno]++ << (8 - s->cbps[compno]);
val += 1 << 7;
val = av_clip(val, 0, (1 << 8) - 1);
*dst = val;
dst += s->ncomponents;
}
line += s->picture->linesize[0];