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avcodec/mjpegdec: move shift_output() to its own function 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-06 02:31:32 +02:00
parent c407c73457
commit b155fb08b8
1 changed files with 16 additions and 12 deletions
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28
libavcodec/mjpegdec.c
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@ -1044,6 +1044,20 @@ 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;
if (s->bits > 8) {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; 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++)
*(ptr + block_x + block_y*linesize) <<= 8 - s->bits;
}
}
static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
int Al, const uint8_t *mb_bitmask,
const AVFrame *reference)
@ -1123,18 +1137,8 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
return AVERROR_INVALIDDATA;
}
s->dsp.idct_put(ptr, linesize[c], s->block);
if (s->bits & 7) {
int block_x, block_y;
if (s->bits > 8) {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
*(uint16_t*)(ptr + 2*block_x + block_y*linesize[c]) <<= 16 - s->bits;
} else {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
*(ptr + 2*block_x + block_y*linesize[c]) <<= 8 - s->bits;
}
}
if (s->bits & 7)
shift_output(s, ptr, linesize[c]);
}
} else {
int block_idx = s->block_stride[c] * (v * mb_y + y) +