ref: d90b1ee16cb13f3b868efc5b084b33a65000689e
dir: /vp8/common/loopfilter_filters.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "vpx_config.h"
#include "loopfilter.h"
#include "onyxc_int.h"
typedef unsigned char uc;
static __inline signed char vp8_signed_char_clamp(int t)
{
t = (t < -128 ? -128 : t);
t = (t > 127 ? 127 : t);
return (signed char) t;
}
/* should we apply any filter at all ( 11111111 yes, 00000000 no) */
static __inline signed char vp8_filter_mask(uc limit, uc blimit,
uc p3, uc p2, uc p1, uc p0,
uc q0, uc q1, uc q2, uc q3)
{
signed char mask = 0;
mask |= (abs(p3 - p2) > limit) * -1;
mask |= (abs(p2 - p1) > limit) * -1;
mask |= (abs(p1 - p0) > limit) * -1;
mask |= (abs(q1 - q0) > limit) * -1;
mask |= (abs(q2 - q1) > limit) * -1;
mask |= (abs(q3 - q2) > limit) * -1;
mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > blimit) * -1;
mask = ~mask;
return mask;
}
/* is there high variance internal edge ( 11111111 yes, 00000000 no) */
static __inline signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1)
{
signed char hev = 0;
hev |= (abs(p1 - p0) > thresh) * -1;
hev |= (abs(q1 - q0) > thresh) * -1;
return hev;
}
static __inline void vp8_filter(signed char mask, uc hev, uc *op1,
uc *op0, uc *oq0, uc *oq1)
{
signed char ps0, qs0;
signed char ps1, qs1;
signed char vp8_filter, Filter1, Filter2;
signed char u;
ps1 = (signed char) * op1 ^ 0x80;
ps0 = (signed char) * op0 ^ 0x80;
qs0 = (signed char) * oq0 ^ 0x80;
qs1 = (signed char) * oq1 ^ 0x80;
/* add outer taps if we have high edge variance */
vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
vp8_filter &= hev;
/* inner taps */
vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
vp8_filter &= mask;
/* save bottom 3 bits so that we round one side +4 and the other +3
* if it equals 4 we'll set to adjust by -1 to account for the fact
* we'd round 3 the other way
*/
Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
Filter1 >>= 3;
Filter2 >>= 3;
u = vp8_signed_char_clamp(qs0 - Filter1);
*oq0 = u ^ 0x80;
u = vp8_signed_char_clamp(ps0 + Filter2);
*op0 = u ^ 0x80;
vp8_filter = Filter1;
/* outer tap adjustments */
vp8_filter += 1;
vp8_filter >>= 1;
vp8_filter &= ~hev;
u = vp8_signed_char_clamp(qs1 - vp8_filter);
*oq1 = u ^ 0x80;
u = vp8_signed_char_clamp(ps1 + vp8_filter);
*op1 = u ^ 0x80;
}
void vp8_loop_filter_horizontal_edge_c
(
unsigned char *s,
int p, /* pitch */
const unsigned char *blimit,
const unsigned char *limit,
const unsigned char *thresh,
int count
)
{
int hev = 0; /* high edge variance */
signed char mask = 0;
int i = 0;
/* loop filter designed to work using chars so that we can make maximum use
* of 8 bit simd instructions.
*/
do
{
mask = vp8_filter_mask(limit[0], blimit[0],
s[-4*p], s[-3*p], s[-2*p], s[-1*p],
s[0*p], s[1*p], s[2*p], s[3*p]);
hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]);
vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
++s;
}
while (++i < count * 8);
}
void vp8_loop_filter_vertical_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit,
const unsigned char *limit,
const unsigned char *thresh,
int count
)
{
int hev = 0; /* high edge variance */
signed char mask = 0;
int i = 0;
/* loop filter designed to work using chars so that we can make maximum use
* of 8 bit simd instructions.
*/
do
{
mask = vp8_filter_mask(limit[0], blimit[0],
s[-4], s[-3], s[-2], s[-1],
s[0], s[1], s[2], s[3]);
hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
s += p;
}
while (++i < count * 8);
}
#if CONFIG_NEWLPF
static __inline signed char vp8_flatmask(uc thresh,
uc p4, uc p3, uc p2, uc p1, uc p0,
uc q0, uc q1, uc q2, uc q3, uc q4)
{
signed char flat = 0;
flat |= (abs(p1 - p0) > 1) * -1;
flat |= (abs(q1 - q0) > 1) * -1;
flat |= (abs(p0 - p2) > 1) * -1;
flat |= (abs(q0 - q2) > 1) * -1;
flat |= (abs(p3 - p0) > 1) * -1;
flat |= (abs(q3 - q0) > 1) * -1;
flat |= (abs(p4 - p0) > 1) * -1;
flat |= (abs(q4 - q0) > 1) * -1;
flat = ~flat;
return flat;
}
static __inline void vp8_mbfilter(signed char mask, uc hev, uc flat,
uc *op4, uc *op3, uc *op2, uc *op1, uc *op0,
uc *oq0, uc *oq1, uc *oq2, uc *oq3, uc *oq4)
{
/* use a 7 tap filter [1, 1, 1, 2, 1, 1, 1] for flat line */
if(flat && mask)
{
unsigned char p0, q0;
unsigned char p1, q1;
unsigned char p2, q2;
unsigned char p3, q3;
unsigned char p4, q4;
p4 = *op4;
p3 = *op3;
p2 = *op2;
p1 = *op1;
p0 = *op0;
q0 = *oq0;
q1 = *oq1;
q2 = *oq2;
q3 = *oq3;
q4 = *oq4;
*op2 = ( p4 + p4 + p3 + p2 + p2 + p1 + p0 + q0 + 4)>>3;
*op1 = ( p4 + p3 + p2 + p1 + p1 + p0 + q0 + q1 + 4)>>3;
*op0 = ( p3 + p2 + p1 + p0 + p0 + q0 + q1 + q2 + 4)>>3;
*oq0 = ( p2 + p1 + p0 + q0 + q0 + q1 + q2 + q3 + 4)>>3;
*oq1 = ( p1 + p0 + q0 + q1 + q1 + q2 + q3 + q4 + 4)>>3;
*oq2 = ( p0 + q0 + q1 + q2 + q2 + q3 + q4 + q4 + 4)>>3;
}
else
{
signed char ps0, qs0;
signed char ps1, qs1;
signed char vp8_filter, Filter1, Filter2;
signed char u;
ps1 = (signed char) * op1 ^ 0x80;
ps0 = (signed char) * op0 ^ 0x80;
qs0 = (signed char) * oq0 ^ 0x80;
qs1 = (signed char) * oq1 ^ 0x80;
/* add outer taps if we have high edge variance */
vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
vp8_filter &= hev;
/* inner taps */
vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
vp8_filter &= mask;
Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
Filter1 >>= 3;
Filter2 >>= 3;
u = vp8_signed_char_clamp(qs0 - Filter1);
*oq0 = u ^ 0x80;
u = vp8_signed_char_clamp(ps0 + Filter2);
*op0 = u ^ 0x80;
vp8_filter = Filter1;
/* outer tap adjustments */
vp8_filter += 1;
vp8_filter >>= 1;
vp8_filter &= ~hev;
u = vp8_signed_char_clamp(qs1 - vp8_filter);
*oq1 = u ^ 0x80;
u = vp8_signed_char_clamp(ps1 + vp8_filter);
*op1 = u ^ 0x80;
}
}
#else
static __inline void vp8_mbfilter(signed char mask, uc hev,
uc *op2, uc *op1, uc *op0,
uc *oq0, uc *oq1, uc *oq2)
{
signed char s, u;
signed char vp8_filter, Filter1, Filter2;
signed char ps2 = (signed char) * op2 ^ 0x80;
signed char ps1 = (signed char) * op1 ^ 0x80;
signed char ps0 = (signed char) * op0 ^ 0x80;
signed char qs0 = (signed char) * oq0 ^ 0x80;
signed char qs1 = (signed char) * oq1 ^ 0x80;
signed char qs2 = (signed char) * oq2 ^ 0x80;
/* add outer taps if we have high edge variance */
vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
vp8_filter &= mask;
Filter2 = vp8_filter;
Filter2 &= hev;
/* save bottom 3 bits so that we round one side +4 and the other +3 */
Filter1 = vp8_signed_char_clamp(Filter2 + 4);
Filter2 = vp8_signed_char_clamp(Filter2 + 3);
Filter1 >>= 3;
Filter2 >>= 3;
qs0 = vp8_signed_char_clamp(qs0 - Filter1);
ps0 = vp8_signed_char_clamp(ps0 + Filter2);
/* only apply wider filter if not high edge variance */
vp8_filter &= ~hev;
Filter2 = vp8_filter;
/* roughly 3/7th difference across boundary */
u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
s = vp8_signed_char_clamp(qs0 - u);
*oq0 = s ^ 0x80;
s = vp8_signed_char_clamp(ps0 + u);
*op0 = s ^ 0x80;
/* roughly 2/7th difference across boundary */
u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
s = vp8_signed_char_clamp(qs1 - u);
*oq1 = s ^ 0x80;
s = vp8_signed_char_clamp(ps1 + u);
*op1 = s ^ 0x80;
/* roughly 1/7th difference across boundary */
u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
s = vp8_signed_char_clamp(qs2 - u);
*oq2 = s ^ 0x80;
s = vp8_signed_char_clamp(ps2 + u);
*op2 = s ^ 0x80;
}
#endif
void vp8_mbloop_filter_horizontal_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit,
const unsigned char *limit,
const unsigned char *thresh,
int count
)
{
signed char hev = 0; /* high edge variance */
signed char mask = 0;
#if CONFIG_NEWLPF
signed char flat = 0;
#endif
int i = 0;
/* loop filter designed to work using chars so that we can make maximum use
* of 8 bit simd instructions.
*/
do
{
mask = vp8_filter_mask(limit[0], blimit[0],
s[-4*p], s[-3*p], s[-2*p], s[-1*p],
s[ 0*p], s[ 1*p], s[ 2*p], s[ 3*p]);
hev = vp8_hevmask(thresh[0], s[-2*p], s[-1*p], s[0*p], s[1*p]);
#if CONFIG_NEWLPF
flat = vp8_flatmask(thresh[0],
s[-5*p], s[-4*p], s[-3*p], s[-2*p], s[-1*p],
s[ 0*p], s[ 1*p], s[ 2*p], s[ 3*p], s[ 4*p]);
vp8_mbfilter(mask, hev, flat,
s - 5*p, s - 4*p, s- 3*p, s - 2*p, s - 1*p,
s, s + 1*p, s+ 2*p, s + 3*p, s + 4*p );
#else
vp8_mbfilter(mask, hev,
s - 3*p, s - 2*p, s - 1*p,
s, s + 1*p, s + 2*p);
#endif
++s;
}
while (++i < count * 8);
}
void vp8_mbloop_filter_vertical_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit,
const unsigned char *limit,
const unsigned char *thresh,
int count
)
{
signed char hev = 0; /* high edge variance */
signed char mask = 0;
#if CONFIG_NEWLPF
signed char flat = 0;
#endif
int i = 0;
do
{
mask = vp8_filter_mask(limit[0], blimit[0],
s[-4], s[-3], s[-2], s[-1],
s[0], s[1], s[2], s[3]);
hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
#if CONFIG_NEWLPF
flat = vp8_flatmask(thresh[0],
s[-5],s[-4],s[-3],s[-2],s[-1],
s[ 0],s[ 1],s[ 2],s[ 3],s[ 4]);
vp8_mbfilter(mask, hev, flat,
s - 5, s - 4, s - 3, s - 2, s - 1,
s, s + 1, s + 2, s + 3, s + 4);
#else
vp8_mbfilter(mask, hev,
s - 3, s - 2, s - 1,
s, s + 1, s + 2);
#endif
s += p;
}
while (++i < count * 8);
}
/* should we apply any filter at all ( 11111111 yes, 00000000 no) */
static __inline signed char vp8_simple_filter_mask(uc blimit,
uc p1, uc p0,
uc q0, uc q1)
{
/* Why does this cause problems for win32?
* error C2143: syntax error : missing ';' before 'type'
* (void) limit;
*/
signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= blimit) * -1;
return mask;
}
static __inline void vp8_simple_filter(signed char mask,
uc *op1, uc *op0,
uc *oq0, uc *oq1)
{
signed char vp8_filter, Filter1, Filter2;
signed char p1 = (signed char) * op1 ^ 0x80;
signed char p0 = (signed char) * op0 ^ 0x80;
signed char q0 = (signed char) * oq0 ^ 0x80;
signed char q1 = (signed char) * oq1 ^ 0x80;
signed char u;
vp8_filter = vp8_signed_char_clamp(p1 - q1);
vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (q0 - p0));
vp8_filter &= mask;
/* save bottom 3 bits so that we round one side +4 and the other +3 */
Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
Filter1 >>= 3;
u = vp8_signed_char_clamp(q0 - Filter1);
*oq0 = u ^ 0x80;
Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
Filter2 >>= 3;
u = vp8_signed_char_clamp(p0 + Filter2);
*op0 = u ^ 0x80;
}
void vp8_loop_filter_simple_horizontal_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit
)
{
signed char mask = 0;
int i = 0;
do
{
mask = vp8_simple_filter_mask(blimit[0],
s[-2*p], s[-1*p],
s[0*p], s[1*p]);
vp8_simple_filter(mask,
s - 2 * p, s - 1 * p,
s, s + 1 * p);
++s;
}
while (++i < 16);
}
void vp8_loop_filter_simple_vertical_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit
)
{
signed char mask = 0;
int i = 0;
do
{
mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]);
vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
s += p;
}
while (++i < 16);
}