ref: d0b525656b7708b0b70c8ecd438e0236f2fa6d37
dir: /vp9/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 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 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 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 filter(signed char mask, uc hev, uc *op1,
uc *op0, uc *oq0, uc *oq1)
{
signed char ps0, qs0;
signed char ps1, qs1;
signed char 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 */
filter = signed_char_clamp(ps1 - qs1);
filter &= hev;
/* inner taps */
filter = signed_char_clamp(filter + 3 * (qs0 - ps0));
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 = signed_char_clamp(filter + 4);
Filter2 = signed_char_clamp(filter + 3);
Filter1 >>= 3;
Filter2 >>= 3;
u = signed_char_clamp(qs0 - Filter1);
*oq0 = u ^ 0x80;
u = signed_char_clamp(ps0 + Filter2);
*op0 = u ^ 0x80;
filter = Filter1;
/* outer tap adjustments */
filter += 1;
filter >>= 1;
filter &= ~hev;
u = signed_char_clamp(qs1 - filter);
*oq1 = u ^ 0x80;
u = signed_char_clamp(ps1 + filter);
*op1 = u ^ 0x80;
}
void vp9_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 = 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 = hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
++s;
} while (++i < count * 8);
}
void vp9_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 = filter_mask(limit[0], blimit[0],
s[-4], s[-3], s[-2], s[-1],
s[0], s[1], s[2], s[3]);
hev = hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
filter(mask, hev, s - 2, s - 1, s, s + 1);
s += p;
} while (++i < count * 8);
}
static __inline signed char 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 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 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 */
filter = signed_char_clamp(ps1 - qs1);
filter &= hev;
/* inner taps */
filter = signed_char_clamp(filter + 3 * (qs0 - ps0));
filter &= mask;
Filter1 = signed_char_clamp(filter + 4);
Filter2 = signed_char_clamp(filter + 3);
Filter1 >>= 3;
Filter2 >>= 3;
u = signed_char_clamp(qs0 - Filter1);
*oq0 = u ^ 0x80;
u = signed_char_clamp(ps0 + Filter2);
*op0 = u ^ 0x80;
filter = Filter1;
/* outer tap adjustments */
filter += 1;
filter >>= 1;
filter &= ~hev;
u = signed_char_clamp(qs1 - filter);
*oq1 = u ^ 0x80;
u = signed_char_clamp(ps1 + filter);
*op1 = u ^ 0x80;
}
}
void vp9_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;
signed char flat = 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 = 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 = hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]);
flat = 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]);
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);
++s;
} while (++i < count * 8);
}
void vp9_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;
signed char flat = 0;
int i = 0;
do {
mask = filter_mask(limit[0], blimit[0],
s[-4], s[-3], s[-2], s[-1],
s[0], s[1], s[2], s[3]);
hev = hevmask(thresh[0], s[-2], s[-1], s[0], s[1]);
flat = flatmask(thresh[0],
s[-5], s[-4], s[-3], s[-2], s[-1],
s[ 0], s[ 1], s[ 2], s[ 3], s[ 4]);
mbfilter(mask, hev, flat,
s - 5, s - 4, s - 3, s - 2, s - 1,
s, s + 1, s + 2, s + 3, s + 4);
s += p;
} while (++i < count * 8);
}
/* should we apply any filter at all ( 11111111 yes, 00000000 no) */
static __inline signed char 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 simple_filter(signed char mask,
uc *op1, uc *op0,
uc *oq0, uc *oq1) {
signed char 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;
filter = signed_char_clamp(p1 - q1);
filter = signed_char_clamp(filter + 3 * (q0 - p0));
filter &= mask;
/* save bottom 3 bits so that we round one side +4 and the other +3 */
Filter1 = signed_char_clamp(filter + 4);
Filter1 >>= 3;
u = signed_char_clamp(q0 - Filter1);
*oq0 = u ^ 0x80;
Filter2 = signed_char_clamp(filter + 3);
Filter2 >>= 3;
u = signed_char_clamp(p0 + Filter2);
*op0 = u ^ 0x80;
}
void vp9_loop_filter_simple_horizontal_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit
) {
signed char mask = 0;
int i = 0;
do {
mask = simple_filter_mask(blimit[0],
s[-2 * p], s[-1 * p],
s[0 * p], s[1 * p]);
simple_filter(mask,
s - 2 * p, s - 1 * p,
s, s + 1 * p);
++s;
} while (++i < 16);
}
void vp9_loop_filter_simple_vertical_edge_c
(
unsigned char *s,
int p,
const unsigned char *blimit
) {
signed char mask = 0;
int i = 0;
do {
mask = simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]);
simple_filter(mask, s - 2, s - 1, s, s + 1);
s += p;
} while (++i < 16);
}
/* Vertical MB Filtering */
void vp9_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_mbloop_filter_vertical_edge_c(y_ptr, y_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 2);
if (u_ptr)
vp9_mbloop_filter_vertical_edge_c(u_ptr, uv_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 1);
if (v_ptr)
vp9_mbloop_filter_vertical_edge_c(v_ptr, uv_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 1);
}
/* Vertical B Filtering */
void vp9_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_loop_filter_vertical_edge_c(y_ptr + 4, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
vp9_loop_filter_vertical_edge_c(y_ptr + 8, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
vp9_loop_filter_vertical_edge_c(y_ptr + 12, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
if (u_ptr)
vp9_loop_filter_vertical_edge_c(u_ptr + 4, uv_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 1);
if (v_ptr)
vp9_loop_filter_vertical_edge_c(v_ptr + 4, uv_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 1);
}
/* Horizontal MB filtering */
void vp9_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_mbloop_filter_horizontal_edge_c(y_ptr, y_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 2);
if (u_ptr)
vp9_mbloop_filter_horizontal_edge_c(u_ptr, uv_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 1);
if (v_ptr)
vp9_mbloop_filter_horizontal_edge_c(v_ptr, uv_stride,
lfi->mblim, lfi->lim, lfi->hev_thr, 1);
}
/* Horizontal B Filtering */
void vp9_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
vp9_loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
vp9_loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 2);
if (u_ptr)
vp9_loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 1);
if (v_ptr)
vp9_loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride,
lfi->blim, lfi->lim, lfi->hev_thr, 1);
}
void vp9_loop_filter_bh8x8_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_mbloop_filter_horizontal_edge_c(
y_ptr + 8 * y_stride, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2);
}
void vp9_loop_filter_bhs_c(unsigned char *y_ptr, int y_stride,
const unsigned char *blimit) {
vp9_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride,
y_stride, blimit);
vp9_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride,
y_stride, blimit);
vp9_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride,
y_stride, blimit);
}
void vp9_loop_filter_bv8x8_c(unsigned char *y_ptr, unsigned char *u_ptr,
unsigned char *v_ptr, int y_stride, int uv_stride,
struct loop_filter_info *lfi) {
vp9_mbloop_filter_vertical_edge_c(
y_ptr + 8, y_stride, lfi->blim, lfi->lim, lfi->hev_thr, 2);
}
void vp9_loop_filter_bvs_c(unsigned char *y_ptr, int y_stride,
const unsigned char *blimit) {
vp9_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, blimit);
vp9_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, blimit);
vp9_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, blimit);
}