ref: 397aad3ec28020a9b766e362e061701783c9633e
dir: /vp8/common/loopfilter_filters.c/
/*
* Copyright (c) 2010 The VP8 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 "loopfilter.h"
#include "onyxc_int.h"
#define NEW_LOOPFILTER_MASK
typedef unsigned char uc;
__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)
__inline signed char vp8_filter_mask(signed char limit, signed char flimit,
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;
#ifndef NEW_LOOPFILTER_MASK
mask |= (abs(p0 - q0) > flimit) * -1;
#else
mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > flimit * 2 + limit) * -1;
#endif
mask = ~mask;
return mask;
}
// is there high variance internal edge ( 11111111 yes, 00000000 no)
__inline signed char vp8_hevmask(signed char 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;
}
__inline void vp8_filter(signed char mask, signed char 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 signed char *flimit,
const signed char *limit,
const signed 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[i], flimit[i],
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[i], 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 signed char *flimit,
const signed char *limit,
const signed 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[i], flimit[i],
s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
hev = vp8_hevmask(thresh[i], 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);
}
__inline void vp8_mbfilter(signed char mask, signed char 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;
}
void vp8_mbloop_filter_horizontal_edge_c
(
unsigned char *s,
int p,
const signed char *flimit,
const signed char *limit,
const signed char *thresh,
int count
)
{
signed char 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[i], flimit[i],
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[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, s + 2 * p);
++s;
}
while (++i < count * 8);
}
void vp8_mbloop_filter_vertical_edge_c
(
unsigned char *s,
int p,
const signed char *flimit,
const signed char *limit,
const signed char *thresh,
int count
)
{
signed char hev = 0; // high edge variance
signed char mask = 0;
int i = 0;
do
{
mask = vp8_filter_mask(limit[i], flimit[i],
s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
hev = vp8_hevmask(thresh[i], s[-2], s[-1], s[0], s[1]);
vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
s += p;
}
while (++i < count * 8);
}
// should we apply any filter at all ( 11111111 yes, 00000000 no)
__inline signed char vp8_simple_filter_mask(signed char limit, signed char flimit, uc p1, uc p0, uc q0, uc q1)
{
// Why does this cause problems for win32?
// error C2143: syntax error : missing ';' before 'type'
// (void) limit;
#ifndef NEW_LOOPFILTER_MASK
signed char mask = (abs(p0 - q0) <= flimit) * -1;
#else
signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= flimit * 2 + limit) * -1;
#endif
return mask;
}
__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 signed char *flimit,
const signed char *limit,
const signed char *thresh,
int count
)
{
signed char mask = 0;
int i = 0;
(void) thresh;
do
{
//mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1*p],s[0*p]);
mask = vp8_simple_filter_mask(limit[i], flimit[i], 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 < count * 8);
}
void vp8_loop_filter_simple_vertical_edge_c
(
unsigned char *s,
int p,
const signed char *flimit,
const signed char *limit,
const signed char *thresh,
int count
)
{
signed char mask = 0;
int i = 0;
(void) thresh;
do
{
//mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1],s[0]);
mask = vp8_simple_filter_mask(limit[i], flimit[i], s[-2], s[-1], s[0], s[1]);
vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
s += p;
}
while (++i < count * 8);
}