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jpeg2000dec; optimize output sample convert a bit

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67935 -> 29984 kcycles

Reviewed-by: Nicolas BERTRAND <nicoinattendu@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-01 18:31:19 +02:00
parent 3da7111193
commit 6507d86f07
1 changed files with 43 additions and 25 deletions
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68
libavcodec/jpeg2000dec.c
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@ -1082,6 +1082,8 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
Jpeg2000Component *comp = tile->comp + compno;
float *datap = comp->f_data;
int32_t *i_datap = comp->i_data;
int cbps = s->cbps[compno];
int w = tile->comp[compno].coord[0][1] - s->image_offset_x;
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
line = picture->data[0] + y * picture->linesize[0];
@ -1091,18 +1093,24 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
x = tile->comp[compno].coord[0][0] - s->image_offset_x;
dst = line + x * s->ncomponents + compno;
for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
int val;
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
if (tile->codsty->transform == FF_DWT97)
val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
else
val = *i_datap + (1 << (s->cbps[compno] - 1));
val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
*dst = val << (8 - s->cbps[compno]);
datap++;
i_datap++;
dst += s->ncomponents;
if (tile->codsty->transform == FF_DWT97) {
for (; x < w; x += s->cdx[compno]) {
int val = lrintf(*datap) + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
*dst = val << (8 - cbps);
datap++;
dst += s->ncomponents;
}
} else {
for (; x < w; x += s->cdx[compno]) {
int val = *i_datap + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
*dst = val << (8 - cbps);
i_datap++;
dst += s->ncomponents;
}
}
line += picture->linesize[0];
}
@ -1113,6 +1121,8 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
float *datap = comp->f_data;
int32_t *i_datap = comp->i_data;
uint16_t *linel;
int cbps = s->cbps[compno];
int w = tile->comp[compno].coord[0][1] - s->image_offset_x;
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
linel = (uint16_t *)picture->data[0] + y * (picture->linesize[0] >> 1);
@ -1121,24 +1131,32 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
x = tile->comp[compno].coord[0][0] - s->image_offset_x;
dst = linel + (x * s->ncomponents + compno);
for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) {
int val;
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
if (tile->codsty->transform == FF_DWT97)
val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
else
val = *i_datap + (1 << (s->cbps[compno] - 1));
val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
/* align 12 bit values in little-endian mode */
*dst = val << (16 - s->cbps[compno]);
datap++;
i_datap++;
dst += s->ncomponents;
if (tile->codsty->transform == FF_DWT97) {
for (; x < w; x += s-> cdx[compno]) {
int val = lrintf(*datap) + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
/* align 12 bit values in little-endian mode */
*dst = val << (16 - cbps);
datap++;
dst += s->ncomponents;
}
} else {
for (; x < w; x += s-> cdx[compno]) {
int val = *i_datap + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
/* align 12 bit values in little-endian mode */
*dst = val << (16 - cbps);
i_datap++;
dst += s->ncomponents;
}
}
linel += picture->linesize[0] >> 1;
}
}
}
return 0;
}