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avcodec/mjpegdec: fix shift_output() with lowres

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Fixes Ticket2940

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-09 01:35:34 +02:00
parent 7caaa72e62
commit ce22820627
1 changed files with 5 additions and 4 deletions
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9
libavcodec/mjpegdec.c
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@ -1047,13 +1047,14 @@ static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
static void shift_output(MJpegDecodeContext *s, uint8_t *ptr, int linesize)
{
int block_x, block_y;
int size = 8 >> s->avctx->lowres;
if (s->bits > 8) {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
for (block_y=0; block_y<size; block_y++)
for (block_x=0; block_x<size; block_x++)
*(uint16_t*)(ptr + 2*block_x + block_y*linesize) <<= 16 - s->bits;
} else {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
for (block_y=0; block_y<size; block_y++)
for (block_x=0; block_x<size; block_x++)
*(ptr + block_x + block_y*linesize) <<= 8 - s->bits;
}
}