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cog: (re-)implement 1/2/4-tap scaling

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This commit is contained in:
David Schleef 2009-09-21 09:35:30 -07:00
parent 213cc0b06d
commit 06c3d2e93c
3 changed files with 161 additions and 29 deletions
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5
ext/cog/Makefile.am
View file

@ -18,6 +18,7 @@ libgstcog_la_SOURCES = \
cog.h \
cogframe.c \
cogframe.h \
cogtables.c \
cogutils.h \
cogvirtframe.c \
cogvirtframe.h \
@ -32,6 +33,10 @@ libgstcog_la_SOURCES = \
gstcolorconvert.c \
gstlogoinsert.c
noinst_PROGRAMS = generate_tables
generate_tables_CFLAGS = $(GST_CFLAGS)
generate_tables_LDADD = $(GST_LIBS)
nodist_libgstcog_la_SOURCES = cogorc.c cogorc.h
CLEANFILES = cogorc.c cogorc.h

18
ext/cog/cog.orc
View file

@ -318,6 +318,24 @@ mergebw t2, s2, s3
mergewl d1, t1, t2
.function cogorc_combine2_u8
.dest 1 d1
.source 1 s1
.source 1 s2
.param 2 p1
.param 2 p2
.temp 2 t1
.temp 2 t2
convubw t1, s1
mullw t1, t1, p1
convubw t2, s2
mullw t2, t2, p2
addw t1, t1, t2
shruw t1, t1, 8
convuuswb d1, t1
.function cogorc_combine4_u8
.dest 1 d1
.source 1 s1

167
ext/cog/cogvirtframe.c
View file

@ -14,6 +14,7 @@
#include "cogorc.h"
extern gint8 cog_resample_table_4tap[256][4];
CogFrame *
cog_frame_new_virtual (CogMemoryDomain * domain, CogFrameFormat format,
@ -499,17 +500,54 @@ cog_virt_frame_new_vert_downsample (CogFrame * vf, int n_taps)
}
void
get_taps (double *taps, double x)
cog_virt_frame_render_resample_vert_1tap (CogFrame * frame, void *_dest,
int component, int i)
{
taps[3] = x * x * (x - 1);
taps[2] = x * (-x * x + x + 1);
x = 1 - x;
taps[1] = x * (-x * x + x + 1);
taps[0] = x * x * (x - 1);
uint8_t *dest = _dest;
uint8_t *src1;
int n_src;
double *scale = (double *) frame->virt_priv;
double x;
int src_i;
x = (*scale) * i;
src_i = floor (x);
n_src = frame->virt_frame1->components[component].height;
src1 = cog_virt_frame_get_line (frame->virt_frame1, component,
CLAMP (src_i + 0, 0, n_src - 1));
orc_memcpy (dest, src1, frame->components[component].width);
}
void
cog_virt_frame_render_resample_vert (CogFrame * frame, void *_dest,
cog_virt_frame_render_resample_vert_2tap (CogFrame * frame, void *_dest,
int component, int i)
{
uint8_t *dest = _dest;
uint8_t *src1;
uint8_t *src2;
int n_src;
double *scale = (double *) frame->virt_priv;
double x;
int src_i;
x = (*scale) * i;
src_i = floor (x);
x -= floor (x);
n_src = frame->virt_frame1->components[component].height;
src1 = cog_virt_frame_get_line (frame->virt_frame1, component,
CLAMP (src_i + 0, 0, n_src - 1));
src2 = cog_virt_frame_get_line (frame->virt_frame1, component,
CLAMP (src_i + 1, 0, n_src - 1));
cogorc_combine2_u8 (dest, src1, src2,
rint (256 * (1 - x)), rint (256 * x), frame->components[component].width);
}
void
cog_virt_frame_render_resample_vert_4tap (CogFrame * frame, void *_dest,
int component, int i)
{
uint8_t *dest = _dest;
@ -518,14 +556,14 @@ cog_virt_frame_render_resample_vert (CogFrame * frame, void *_dest,
uint8_t *src3;
uint8_t *src4;
int n_src;
double taps[4];
double *scale = (double *) frame->virt_priv;
double x;
int src_i;
int y;
x = (*scale) * i;
src_i = floor (x);
get_taps (taps, x - floor (x));
y = 256 * (x - floor (x));
n_src = frame->virt_frame1->components[component].height;
src1 = cog_virt_frame_get_line (frame->virt_frame1, component,
@ -538,9 +576,10 @@ cog_virt_frame_render_resample_vert (CogFrame * frame, void *_dest,
CLAMP (src_i + 2, 0, n_src - 1));
cogorc_combine4_u8 (dest, src1, src2, src3, src4,
rint (taps[0] * 64.0), rint (taps[1] * 64.0),
rint (taps[2] * 64.0), rint (taps[3] * 64.0),
frame->components[component].width);
cog_resample_table_4tap[y][0],
cog_resample_table_4tap[y][1],
cog_resample_table_4tap[y][2],
cog_resample_table_4tap[y][3], frame->components[component].width);
}
CogFrame *
@ -548,10 +587,17 @@ cog_virt_frame_new_vert_resample (CogFrame * vf, int height)
{
CogFrame *virt_frame;
double *scale;
int taps = 4;
virt_frame = cog_frame_new_virtual (NULL, vf->format, vf->width, height);
virt_frame->virt_frame1 = vf;
virt_frame->render_line = cog_virt_frame_render_resample_vert;
if (taps == 1) {
virt_frame->render_line = cog_virt_frame_render_resample_vert_1tap;
} else if (taps == 2) {
virt_frame->render_line = cog_virt_frame_render_resample_vert_2tap;
} else {
virt_frame->render_line = cog_virt_frame_render_resample_vert_4tap;
}
scale = malloc (sizeof (double));
virt_frame->virt_priv = scale;
@ -562,34 +608,91 @@ cog_virt_frame_new_vert_resample (CogFrame * vf, int height)
}
void
cog_virt_frame_render_resample_horiz (CogFrame * frame, void *_dest,
cog_virt_frame_render_resample_horiz_1tap (CogFrame * frame, void *_dest,
int component, int i)
{
uint8_t *dest = _dest;
uint8_t *src;
int j;
int n_src;
double taps[4];
double *scale = (double *) frame->virt_priv;
int src_i;
int scale = frame->param1;
int acc;
n_src = frame->virt_frame1->components[component].width;
src = cog_virt_frame_get_line (frame->virt_frame1, component, i);
acc = 0;
for (j = 0; j < frame->components[component].width; j++) {
double x;
double y = 0;
dest[j] = src[(acc >> 8)];
acc += scale;
}
}
x = (*scale) * j;
src_i = floor (x);
get_taps (taps, x - floor (x));
void
cog_virt_frame_render_resample_horiz_4tap (CogFrame * frame, void *_dest,
int component, int i)
{
uint8_t *dest = _dest;
uint8_t *src;
int j;
int n_src;
int scale = frame->param1;
int acc;
y = 0;
y += taps[0] * src[CLAMP (src_i - 1, 0, n_src - 1)];
y += taps[1] * src[CLAMP (src_i + 0, 0, n_src - 1)];
y += taps[2] * src[CLAMP (src_i + 1, 0, n_src - 1)];
y += taps[3] * src[CLAMP (src_i + 2, 0, n_src - 1)];
dest[j] = CLAMP (rint (y), 0, 255);
n_src = frame->virt_frame1->components[component].width;
src = cog_virt_frame_get_line (frame->virt_frame1, component, i);
acc = 0;
for (j = 0; j < 1; j++) {
int src_i;
int y;
int z;
src_i = acc >> 8;
y = acc & 255;
z = 32;
z += cog_resample_table_4tap[y][0] * src[CLAMP (src_i - 1, 0, n_src - 1)];
z += cog_resample_table_4tap[y][1] * src[CLAMP (src_i + 0, 0, n_src - 1)];
z += cog_resample_table_4tap[y][2] * src[CLAMP (src_i + 1, 0, n_src - 1)];
z += cog_resample_table_4tap[y][3] * src[CLAMP (src_i + 2, 0, n_src - 1)];
z >>= 6;
dest[j] = CLAMP (z, 0, 255);
acc += scale;
}
for (; j < frame->components[component].width - 2; j++) {
int src_i;
int y;
int z;
src_i = acc >> 8;
y = acc & 255;
z = 32;
z += cog_resample_table_4tap[y][0] * src[src_i - 1];
z += cog_resample_table_4tap[y][1] * src[src_i + 0];
z += cog_resample_table_4tap[y][2] * src[src_i + 1];
z += cog_resample_table_4tap[y][3] * src[src_i + 2];
z >>= 6;
dest[j] = CLAMP (z, 0, 255);
acc += scale;
}
for (; j < frame->components[component].width; j++) {
int src_i;
int y;
int z;
src_i = acc >> 8;
y = acc & 255;
z = 32;
z += cog_resample_table_4tap[y][0] * src[CLAMP (src_i - 1, 0, n_src - 1)];
z += cog_resample_table_4tap[y][1] * src[CLAMP (src_i + 0, 0, n_src - 1)];
z += cog_resample_table_4tap[y][2] * src[CLAMP (src_i + 1, 0, n_src - 1)];
z += cog_resample_table_4tap[y][3] * src[CLAMP (src_i + 2, 0, n_src - 1)];
z >>= 6;
dest[j] = CLAMP (z, 0, 255);
acc += scale;
}
}
@ -598,15 +701,21 @@ cog_virt_frame_new_horiz_resample (CogFrame * vf, int width)
{
CogFrame *virt_frame;
double *scale;
int taps = 4;
virt_frame = cog_frame_new_virtual (NULL, vf->format, width, vf->height);
virt_frame->virt_frame1 = vf;
virt_frame->render_line = cog_virt_frame_render_resample_horiz;
if (taps == 1) {
virt_frame->render_line = cog_virt_frame_render_resample_horiz_1tap;
} else {
virt_frame->render_line = cog_virt_frame_render_resample_horiz_4tap;
}
scale = malloc (sizeof (double));
virt_frame->virt_priv = scale;
*scale = (double) vf->width / width;
virt_frame->param1 = 256.0 * (*scale);
return virt_frame;
}