ref: aeefa6e194b2e844372ef9892689121c50cf1111
dir: /vp9/common/vp9_loopfilter.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 "vpx_config.h"
#include "vp9/common/vp9_loopfilter.h"
#include "vp9/common/vp9_onyxc_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vp9/common/vp9_seg_common.h"
static void lf_init_lut(loop_filter_info_n *lfi) {
int filt_lvl;
for (filt_lvl = 0; filt_lvl <= MAX_LOOP_FILTER; filt_lvl++) {
if (filt_lvl >= 40) {
lfi->hev_thr_lut[KEY_FRAME][filt_lvl] = 2;
lfi->hev_thr_lut[INTER_FRAME][filt_lvl] = 3;
} else if (filt_lvl >= 20) {
lfi->hev_thr_lut[KEY_FRAME][filt_lvl] = 1;
lfi->hev_thr_lut[INTER_FRAME][filt_lvl] = 2;
} else if (filt_lvl >= 15) {
lfi->hev_thr_lut[KEY_FRAME][filt_lvl] = 1;
lfi->hev_thr_lut[INTER_FRAME][filt_lvl] = 1;
} else {
lfi->hev_thr_lut[KEY_FRAME][filt_lvl] = 0;
lfi->hev_thr_lut[INTER_FRAME][filt_lvl] = 0;
}
}
lfi->mode_lf_lut[DC_PRED] = 1;
lfi->mode_lf_lut[D45_PRED] = 1;
lfi->mode_lf_lut[D135_PRED] = 1;
lfi->mode_lf_lut[D117_PRED] = 1;
lfi->mode_lf_lut[D153_PRED] = 1;
lfi->mode_lf_lut[D27_PRED] = 1;
lfi->mode_lf_lut[D63_PRED] = 1;
lfi->mode_lf_lut[V_PRED] = 1;
lfi->mode_lf_lut[H_PRED] = 1;
lfi->mode_lf_lut[TM_PRED] = 1;
lfi->mode_lf_lut[B_PRED] = 0;
lfi->mode_lf_lut[I8X8_PRED] = 0;
lfi->mode_lf_lut[ZEROMV] = 1;
lfi->mode_lf_lut[NEARESTMV] = 2;
lfi->mode_lf_lut[NEARMV] = 2;
lfi->mode_lf_lut[NEWMV] = 2;
lfi->mode_lf_lut[SPLITMV] = 3;
}
void vp9_loop_filter_update_sharpness(loop_filter_info_n *lfi,
int sharpness_lvl) {
int i;
/* For each possible value for the loop filter fill out limits */
for (i = 0; i <= MAX_LOOP_FILTER; i++) {
int filt_lvl = i;
int block_inside_limit = 0;
/* Set loop filter paramaeters that control sharpness. */
block_inside_limit = filt_lvl >> (sharpness_lvl > 0);
block_inside_limit = block_inside_limit >> (sharpness_lvl > 4);
if (sharpness_lvl > 0) {
if (block_inside_limit > (9 - sharpness_lvl))
block_inside_limit = (9 - sharpness_lvl);
}
if (block_inside_limit < 1)
block_inside_limit = 1;
vpx_memset(lfi->lim[i], block_inside_limit, SIMD_WIDTH);
vpx_memset(lfi->blim[i], (2 * filt_lvl + block_inside_limit),
SIMD_WIDTH);
vpx_memset(lfi->mblim[i], (2 * (filt_lvl + 2) + block_inside_limit),
SIMD_WIDTH);
}
}
void vp9_loop_filter_init(VP9_COMMON *cm) {
loop_filter_info_n *lfi = &cm->lf_info;
int i;
// init limits for given sharpness
vp9_loop_filter_update_sharpness(lfi, cm->sharpness_level);
cm->last_sharpness_level = cm->sharpness_level;
// init LUT for lvl and hev thr picking
lf_init_lut(lfi);
// init hev threshold const vectors
for (i = 0; i < 4; i++)
vpx_memset(lfi->hev_thr[i], i, SIMD_WIDTH);
}
void vp9_loop_filter_frame_init(VP9_COMMON *cm,
MACROBLOCKD *xd,
int default_filt_lvl) {
int seg, /* segment number */
ref, /* index in ref_lf_deltas */
mode; /* index in mode_lf_deltas */
loop_filter_info_n *lfi = &cm->lf_info;
/* update limits if sharpness has changed */
// printf("vp9_loop_filter_frame_init %d\n", default_filt_lvl);
// printf("sharpness level: %d [%d]\n",
// cm->sharpness_level, cm->last_sharpness_level);
if (cm->last_sharpness_level != cm->sharpness_level) {
vp9_loop_filter_update_sharpness(lfi, cm->sharpness_level);
cm->last_sharpness_level = cm->sharpness_level;
}
for (seg = 0; seg < MAX_MB_SEGMENTS; seg++) {
int lvl_seg = default_filt_lvl;
int lvl_ref, lvl_mode;
// Set the baseline filter values for each segment
if (vp9_segfeature_active(xd, seg, SEG_LVL_ALT_LF)) {
/* Abs value */
if (xd->mb_segment_abs_delta == SEGMENT_ABSDATA) {
lvl_seg = vp9_get_segdata(xd, seg, SEG_LVL_ALT_LF);
} else { /* Delta Value */
lvl_seg += vp9_get_segdata(xd, seg, SEG_LVL_ALT_LF);
lvl_seg = clamp(lvl_seg, 0, 63);
}
}
if (!xd->mode_ref_lf_delta_enabled) {
/* we could get rid of this if we assume that deltas are set to
* zero when not in use; encoder always uses deltas
*/
vpx_memset(lfi->lvl[seg][0], lvl_seg, 4 * 4);
continue;
}
lvl_ref = lvl_seg;
/* INTRA_FRAME */
ref = INTRA_FRAME;
/* Apply delta for reference frame */
lvl_ref += xd->ref_lf_deltas[ref];
/* Apply delta for Intra modes */
mode = 0; /* B_PRED */
/* Only the split mode BPRED has a further special case */
lvl_mode = clamp(lvl_ref + xd->mode_lf_deltas[mode], 0, 63);
lfi->lvl[seg][ref][mode] = lvl_mode;
mode = 1; /* all the rest of Intra modes */
lvl_mode = clamp(lvl_ref, 0, 63);
lfi->lvl[seg][ref][mode] = lvl_mode;
/* LAST, GOLDEN, ALT */
for (ref = 1; ref < MAX_REF_FRAMES; ref++) {
int lvl_ref = lvl_seg;
/* Apply delta for reference frame */
lvl_ref += xd->ref_lf_deltas[ref];
/* Apply delta for Inter modes */
for (mode = 1; mode < 4; mode++) {
lvl_mode = clamp(lvl_ref + xd->mode_lf_deltas[mode], 0, 63);
lfi->lvl[seg][ref][mode] = lvl_mode;
}
}
}
}
// Determine if we should skip inner-MB loop filtering within a MB
// The current condition is that the loop filtering is skipped only
// the MB uses a prediction size of 16x16 and either 16x16 transform
// is used or there is no residue at all.
static int mb_lf_skip(const MB_MODE_INFO *const mbmi) {
const MB_PREDICTION_MODE mode = mbmi->mode;
const int skip_coef = mbmi->mb_skip_coeff;
const int tx_size = mbmi->txfm_size;
return mode != B_PRED && mode != I8X8_PRED && mode != SPLITMV &&
(tx_size >= TX_16X16 || skip_coef);
}
// Determine if we should skip MB loop filtering on a MB edge within
// a superblock, the current condition is that MB loop filtering is
// skipped only when both MBs do not use inner MB loop filtering, and
// same motion vector with same reference frame
static int sb_mb_lf_skip(const MODE_INFO *const mip0,
const MODE_INFO *const mip1) {
const MB_MODE_INFO *mbmi0 = &mip0->mbmi;
const MB_MODE_INFO *mbmi1 = &mip0->mbmi;
return mb_lf_skip(mbmi0) && mb_lf_skip(mbmi1) &&
(mbmi0->ref_frame == mbmi1->ref_frame) &&
(mbmi0->mv[mbmi0->ref_frame].as_int ==
mbmi1->mv[mbmi1->ref_frame].as_int) &&
mbmi0->ref_frame != INTRA_FRAME;
}
void vp9_loop_filter_frame(VP9_COMMON *cm,
MACROBLOCKD *xd,
int frame_filter_level,
int y_only,
int dering) {
YV12_BUFFER_CONFIG *post = cm->frame_to_show;
loop_filter_info_n *lfi_n = &cm->lf_info;
struct loop_filter_info lfi;
const FRAME_TYPE frame_type = cm->frame_type;
int mb_row, mb_col;
// Set up the buffer pointers
uint8_t *y_ptr = post->y_buffer;
uint8_t *u_ptr = y_only ? 0 : post->u_buffer;
uint8_t *v_ptr = y_only ? 0 : post->v_buffer;
// Point at base of Mb MODE_INFO list
const MODE_INFO *mode_info_context = cm->mi;
const int mis = cm->mode_info_stride;
// Initialize the loop filter for this frame.
vp9_loop_filter_frame_init(cm, xd, frame_filter_level);
// vp9_filter each macro block
for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
const MB_PREDICTION_MODE mode = mode_info_context->mbmi.mode;
const int mode_index = lfi_n->mode_lf_lut[mode];
const int seg = mode_info_context->mbmi.segment_id;
const int ref_frame = mode_info_context->mbmi.ref_frame;
const int filter_level = lfi_n->lvl[seg][ref_frame][mode_index];
if (filter_level) {
const int skip_lf = mb_lf_skip(&mode_info_context->mbmi);
const int tx_size = mode_info_context->mbmi.txfm_size;
if (cm->filter_type == NORMAL_LOOPFILTER) {
const int hev_index = lfi_n->hev_thr_lut[frame_type][filter_level];
lfi.mblim = lfi_n->mblim[filter_level];
lfi.blim = lfi_n->blim[filter_level];
lfi.lim = lfi_n->lim[filter_level];
lfi.hev_thr = lfi_n->hev_thr[hev_index];
if (mb_col > 0 &&
!((mb_col & 1) && mode_info_context->mbmi.sb_type &&
(sb_mb_lf_skip(mode_info_context - 1, mode_info_context) ||
tx_size >= TX_32X32))
) {
if (tx_size >= TX_16X16)
vp9_lpf_mbv_w(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
else
vp9_loop_filter_mbv(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
}
if (!skip_lf) {
if (tx_size >= TX_8X8) {
if (tx_size == TX_8X8 && (mode == I8X8_PRED || mode == SPLITMV))
vp9_loop_filter_bv8x8(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
else
vp9_loop_filter_bv8x8(y_ptr, NULL, NULL, post->y_stride,
post->uv_stride, &lfi);
} else {
vp9_loop_filter_bv(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
}
}
/* don't apply across umv border */
if (mb_row > 0 &&
!((mb_row & 1) && mode_info_context->mbmi.sb_type &&
(sb_mb_lf_skip(mode_info_context - mis, mode_info_context) ||
tx_size >= TX_32X32))
) {
if (tx_size >= TX_16X16)
vp9_lpf_mbh_w(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
else
vp9_loop_filter_mbh(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
}
if (!skip_lf) {
if (tx_size >= TX_8X8) {
if (tx_size == TX_8X8 && (mode == I8X8_PRED || mode == SPLITMV))
vp9_loop_filter_bh8x8(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
else
vp9_loop_filter_bh8x8(y_ptr, NULL, NULL, post->y_stride,
post->uv_stride, &lfi);
} else {
vp9_loop_filter_bh(y_ptr, u_ptr, v_ptr, post->y_stride,
post->uv_stride, &lfi);
}
}
#if CONFIG_LOOP_DERING
if (dering) {
if (mb_row && mb_row < cm->mb_rows - 1 &&
mb_col && mb_col < cm->mb_cols - 1) {
vp9_post_proc_down_and_across(y_ptr, y_ptr,
post->y_stride, post->y_stride,
16, 16, dering);
if (!y_only) {
vp9_post_proc_down_and_across(u_ptr, u_ptr,
post->uv_stride, post->uv_stride,
8, 8, dering);
vp9_post_proc_down_and_across(v_ptr, v_ptr,
post->uv_stride, post->uv_stride,
8, 8, dering);
}
} else {
// Adjust the filter so that no out-of-frame data is used.
uint8_t *dr_y = y_ptr, *dr_u = u_ptr, *dr_v = v_ptr;
int w_adjust = 0;
int h_adjust = 0;
if (mb_col == 0) {
dr_y += 2;
dr_u += 2;
dr_v += 2;
w_adjust += 2;
}
if (mb_col == cm->mb_cols - 1)
w_adjust += 2;
if (mb_row == 0) {
dr_y += 2 * post->y_stride;
dr_u += 2 * post->uv_stride;
dr_v += 2 * post->uv_stride;
h_adjust += 2;
}
if (mb_row == cm->mb_rows - 1)
h_adjust += 2;
vp9_post_proc_down_and_across_c(dr_y, dr_y,
post->y_stride, post->y_stride,
16 - w_adjust, 16 - h_adjust,
dering);
if (!y_only) {
vp9_post_proc_down_and_across_c(dr_u, dr_u,
post->uv_stride,
post->uv_stride,
8 - w_adjust, 8 - h_adjust,
dering);
vp9_post_proc_down_and_across_c(dr_v, dr_v,
post->uv_stride,
post->uv_stride,
8 - w_adjust, 8 - h_adjust,
dering);
}
}
}
#endif
} else {
// FIXME: Not 8x8 aware
if (mb_col > 0 &&
!(skip_lf && mb_lf_skip(&mode_info_context[-1].mbmi)) &&
!((mb_col & 1) && mode_info_context->mbmi.sb_type))
vp9_loop_filter_simple_mbv(y_ptr, post->y_stride,
lfi_n->mblim[filter_level]);
if (!skip_lf)
vp9_loop_filter_simple_bv(y_ptr, post->y_stride,
lfi_n->blim[filter_level]);
/* don't apply across umv border */
if (mb_row > 0 &&
!(skip_lf && mb_lf_skip(&mode_info_context[-mis].mbmi)) &&
!((mb_row & 1) && mode_info_context->mbmi.sb_type))
vp9_loop_filter_simple_mbh(y_ptr, post->y_stride,
lfi_n->mblim[filter_level]);
if (!skip_lf)
vp9_loop_filter_simple_bh(y_ptr, post->y_stride,
lfi_n->blim[filter_level]);
}
}
y_ptr += 16;
if (!y_only) {
u_ptr += 8;
v_ptr += 8;
}
mode_info_context++; // step to next MB
}
y_ptr += post->y_stride * 16 - post->y_width;
if (!y_only) {
u_ptr += post->uv_stride * 8 - post->uv_width;
v_ptr += post->uv_stride * 8 - post->uv_width;
}
mode_info_context++; // Skip border mb
}
}
void vp9_loop_filter_partial_frame(VP9_COMMON *cm, MACROBLOCKD *xd,
int default_filt_lvl) {
YV12_BUFFER_CONFIG *post = cm->frame_to_show;
uint8_t *y_ptr;
int mb_row;
int mb_col;
int mb_cols = post->y_width >> 4;
int linestocopy, i;
loop_filter_info_n *lfi_n = &cm->lf_info;
struct loop_filter_info lfi;
int filter_level;
int alt_flt_enabled = xd->segmentation_enabled;
FRAME_TYPE frame_type = cm->frame_type;
const MODE_INFO *mode_info_context;
int lvl_seg[MAX_MB_SEGMENTS];
mode_info_context = cm->mi + (post->y_height >> 5) * (mb_cols + 1);
/* 3 is a magic number. 4 is probably magic too */
linestocopy = (post->y_height >> (4 + 3));
if (linestocopy < 1)
linestocopy = 1;
linestocopy <<= 4;
/* Note the baseline filter values for each segment */
/* See vp9_loop_filter_frame_init. Rather than call that for each change
* to default_filt_lvl, copy the relevant calculation here.
*/
if (alt_flt_enabled) {
for (i = 0; i < MAX_MB_SEGMENTS; i++) {
if (xd->mb_segment_abs_delta == SEGMENT_ABSDATA) {
// Abs value
lvl_seg[i] = vp9_get_segdata(xd, i, SEG_LVL_ALT_LF);
} else {
// Delta Value
lvl_seg[i] = default_filt_lvl + vp9_get_segdata(xd, i, SEG_LVL_ALT_LF);
lvl_seg[i] = clamp(lvl_seg[i], 0, 63);
}
}
}
/* Set up the buffer pointers */
y_ptr = post->y_buffer + (post->y_height >> 5) * 16 * post->y_stride;
/* vp9_filter each macro block */
for (mb_row = 0; mb_row < (linestocopy >> 4); mb_row++) {
for (mb_col = 0; mb_col < mb_cols; mb_col++) {
int skip_lf = (mode_info_context->mbmi.mode != B_PRED &&
mode_info_context->mbmi.mode != I8X8_PRED &&
mode_info_context->mbmi.mode != SPLITMV &&
mode_info_context->mbmi.mb_skip_coeff);
if (alt_flt_enabled)
filter_level = lvl_seg[mode_info_context->mbmi.segment_id];
else
filter_level = default_filt_lvl;
if (filter_level) {
if (cm->filter_type == NORMAL_LOOPFILTER) {
const int hev_index = lfi_n->hev_thr_lut[frame_type][filter_level];
lfi.mblim = lfi_n->mblim[filter_level];
lfi.blim = lfi_n->blim[filter_level];
lfi.lim = lfi_n->lim[filter_level];
lfi.hev_thr = lfi_n->hev_thr[hev_index];
if (mb_col > 0)
vp9_loop_filter_mbv(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp9_loop_filter_bv(y_ptr, 0, 0, post->y_stride, 0, &lfi);
vp9_loop_filter_mbh(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp9_loop_filter_bh(y_ptr, 0, 0, post->y_stride, 0, &lfi);
} else {
if (mb_col > 0)
vp9_loop_filter_simple_mbv (y_ptr, post->y_stride,
lfi_n->mblim[filter_level]);
if (!skip_lf)
vp9_loop_filter_simple_bv(y_ptr, post->y_stride,
lfi_n->blim[filter_level]);
vp9_loop_filter_simple_mbh(y_ptr, post->y_stride,
lfi_n->mblim[filter_level]);
if (!skip_lf)
vp9_loop_filter_simple_bh(y_ptr, post->y_stride,
lfi_n->blim[filter_level]);
}
}
y_ptr += 16;
mode_info_context += 1; /* step to next MB */
}
y_ptr += post->y_stride * 16 - post->y_width;
mode_info_context += 1; /* Skip border mb */
}
}