From 22e18ea39e371030cc78973d1b46aae45a7ea215 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Mon, 1 Jul 2013 10:01:37 +0200
Subject: [PATCH] jpeg2000: Optimize output sample conversion
67935 -> 29984 kcycles
Reviewed-by: Nicolas BERTRAND <nicoinattendu@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
libavcodec/jpeg2000dec.c | 69 +++++++++++++++++++++++++---------------
1 file changed, 44 insertions(+), 25 deletions(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index db7a0c89ba4..89cae5f2cb0 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1162,6 +1162,9 @@ 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];
for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
@@ -1170,18 +1173,24 @@ 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];
}
@@ -1192,6 +1201,8 @@ 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);
@@ -1199,24 +1210,32 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
uint16_t *dst;
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;
}
--
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