ref: d9ca52452bff9481ec1ed4684985a86fb7fc3c3e
dir: /vp8/common/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 "vpx_rtcd.h"
#include "loopfilter.h"
#include "onyxc_int.h"
#include "vpx_mem/vpx_mem.h"
typedef unsigned char uc;
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[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[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 vp8_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 vp8_loop_filter_init(VP8_COMMON *cm)
{
loop_filter_info_n *lfi = &cm->lf_info;
int i;
/* init limits for given sharpness*/
vp8_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 vp8_loop_filter_frame_init(VP8_COMMON *cm,
MACROBLOCKD *mbd,
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 */
if(cm->last_sharpness_level != cm->sharpness_level)
{
vp8_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;
/* Note the baseline filter values for each segment */
if (mbd->segmentation_enabled)
{
/* Abs value */
if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
{
lvl_seg = mbd->segment_feature_data[MB_LVL_ALT_LF][seg];
}
else /* Delta Value */
{
lvl_seg += mbd->segment_feature_data[MB_LVL_ALT_LF][seg];
lvl_seg = (lvl_seg > 0) ? ((lvl_seg > 63) ? 63: lvl_seg) : 0;
}
}
if (!mbd->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 += mbd->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 = lvl_ref + mbd->mode_lf_deltas[mode];
lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0; /* clamp */
lfi->lvl[seg][ref][mode] = lvl_mode;
mode = 1; /* all the rest of Intra modes */
lvl_mode = (lvl_ref > 0) ? (lvl_ref > 63 ? 63 : lvl_ref) : 0; /* clamp */
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 += mbd->ref_lf_deltas[ref];
/* Apply delta for Inter modes */
for (mode = 1; mode < 4; mode++)
{
lvl_mode = lvl_ref + mbd->mode_lf_deltas[mode];
lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0; /* clamp */
lfi->lvl[seg][ref][mode] = lvl_mode;
}
}
}
}
void vp8_loop_filter_frame
(
VP8_COMMON *cm,
MACROBLOCKD *mbd
)
{
YV12_BUFFER_CONFIG *post = cm->frame_to_show;
loop_filter_info_n *lfi_n = &cm->lf_info;
loop_filter_info lfi;
FRAME_TYPE frame_type = cm->frame_type;
int mb_row;
int mb_col;
int filter_level;
unsigned char *y_ptr, *u_ptr, *v_ptr;
/* Point at base of Mb MODE_INFO list */
const MODE_INFO *mode_info_context = cm->mi;
/* Initialize the loop filter for this frame. */
vp8_loop_filter_frame_init(cm, mbd, cm->filter_level);
/* Set up the buffer pointers */
y_ptr = post->y_buffer;
u_ptr = post->u_buffer;
v_ptr = post->v_buffer;
/* vp8_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++)
{
int skip_lf = (mode_info_context->mbmi.mode != B_PRED &&
mode_info_context->mbmi.mode != SPLITMV &&
mode_info_context->mbmi.mb_skip_coeff);
const int mode_index = lfi_n->mode_lf_lut[mode_info_context->mbmi.mode];
const int seg = mode_info_context->mbmi.segment_id;
const int ref_frame = mode_info_context->mbmi.ref_frame;
filter_level = lfi_n->lvl[seg][ref_frame][mode_index];
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)
vp8_loop_filter_mbv
(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi);
if (!skip_lf)
vp8_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)
vp8_loop_filter_mbh
(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi);
if (!skip_lf)
vp8_loop_filter_bh
(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi);
}
else
{
if (mb_col > 0)
vp8_loop_filter_simple_mbv
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_loop_filter_simple_bv
(y_ptr, post->y_stride, lfi_n->blim[filter_level]);
/* don't apply across umv border */
if (mb_row > 0)
vp8_loop_filter_simple_mbh
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_loop_filter_simple_bh
(y_ptr, post->y_stride, lfi_n->blim[filter_level]);
}
}
y_ptr += 16;
u_ptr += 8;
v_ptr += 8;
mode_info_context++; /* step to next MB */
}
y_ptr += post->y_stride * 16 - post->y_width;
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 vp8_loop_filter_frame_yonly
(
VP8_COMMON *cm,
MACROBLOCKD *mbd,
int default_filt_lvl
)
{
YV12_BUFFER_CONFIG *post = cm->frame_to_show;
unsigned char *y_ptr;
int mb_row;
int mb_col;
loop_filter_info_n *lfi_n = &cm->lf_info;
loop_filter_info lfi;
int filter_level;
FRAME_TYPE frame_type = cm->frame_type;
/* Point at base of Mb MODE_INFO list */
const MODE_INFO *mode_info_context = cm->mi;
#if 0
if(default_filt_lvl == 0) /* no filter applied */
return;
#endif
/* Initialize the loop filter for this frame. */
vp8_loop_filter_frame_init( cm, mbd, default_filt_lvl);
/* Set up the buffer pointers */
y_ptr = post->y_buffer;
/* vp8_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++)
{
int skip_lf = (mode_info_context->mbmi.mode != B_PRED &&
mode_info_context->mbmi.mode != SPLITMV &&
mode_info_context->mbmi.mb_skip_coeff);
const int mode_index = lfi_n->mode_lf_lut[mode_info_context->mbmi.mode];
const int seg = mode_info_context->mbmi.segment_id;
const int ref_frame = mode_info_context->mbmi.ref_frame;
filter_level = lfi_n->lvl[seg][ref_frame][mode_index];
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)
vp8_loop_filter_mbv
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp8_loop_filter_bv
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
/* don't apply across umv border */
if (mb_row > 0)
vp8_loop_filter_mbh
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp8_loop_filter_bh
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
}
else
{
if (mb_col > 0)
vp8_loop_filter_simple_mbv
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_loop_filter_simple_bv
(y_ptr, post->y_stride, lfi_n->blim[filter_level]);
/* don't apply across umv border */
if (mb_row > 0)
vp8_loop_filter_simple_mbh
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_loop_filter_simple_bh
(y_ptr, post->y_stride, lfi_n->blim[filter_level]);
}
}
y_ptr += 16;
mode_info_context ++; /* step to next MB */
}
y_ptr += post->y_stride * 16 - post->y_width;
mode_info_context ++; /* Skip border mb */
}
}
void vp8_loop_filter_partial_frame
(
VP8_COMMON *cm,
MACROBLOCKD *mbd,
int default_filt_lvl
)
{
YV12_BUFFER_CONFIG *post = cm->frame_to_show;
unsigned char *y_ptr;
int mb_row;
int mb_col;
int mb_cols = post->y_width >> 4;
int mb_rows = post->y_height >> 4;
int linestocopy, i;
loop_filter_info_n *lfi_n = &cm->lf_info;
loop_filter_info lfi;
int filter_level;
int alt_flt_enabled = mbd->segmentation_enabled;
FRAME_TYPE frame_type = cm->frame_type;
const MODE_INFO *mode_info_context;
int lvl_seg[MAX_MB_SEGMENTS];
/* number of MB rows to use in partial filtering */
linestocopy = mb_rows / PARTIAL_FRAME_FRACTION;
linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */
/* Note the baseline filter values for each segment */
/* See vp8_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++)
{ /* Abs value */
if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
{
lvl_seg[i] = mbd->segment_feature_data[MB_LVL_ALT_LF][i];
}
/* Delta Value */
else
{
lvl_seg[i] = default_filt_lvl
+ mbd->segment_feature_data[MB_LVL_ALT_LF][i];
lvl_seg[i] = (lvl_seg[i] > 0) ?
((lvl_seg[i] > 63) ? 63: lvl_seg[i]) : 0;
}
}
}
/* Set up the buffer pointers; partial image starts at ~middle of frame */
y_ptr = post->y_buffer + ((post->y_height >> 5) * 16) * post->y_stride;
mode_info_context = cm->mi + (post->y_height >> 5) * (mb_cols + 1);
/* vp8_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 != 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)
vp8_loop_filter_mbv
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp8_loop_filter_bv
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
vp8_loop_filter_mbh
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
if (!skip_lf)
vp8_loop_filter_bh
(y_ptr, 0, 0, post->y_stride, 0, &lfi);
}
else
{
if (mb_col > 0)
vp8_loop_filter_simple_mbv
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_loop_filter_simple_bv
(y_ptr, post->y_stride, lfi_n->blim[filter_level]);
vp8_loop_filter_simple_mbh
(y_ptr, post->y_stride, lfi_n->mblim[filter_level]);
if (!skip_lf)
vp8_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 */
}
}