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uvg266/src/filter.c

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/*****************************************************************************
* This file is part of Kvazaar HEVC encoder.
*
* Copyright (C) 2013-2015 Tampere University of Technology and others (see
* COPYING file).
*
* Kvazaar is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
/*
* \file
*/
#include "filter.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "bitstream.h"
#include "videoframe.h"
#include "cabac.h"
#include "transform.h"
//////////////////////////////////////////////////////////////////////////
// INITIALIZATIONS
const uint8_t g_tc_table_8x8[54] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 2, 2, 2,
2, 3, 3, 3, 3, 4, 4, 4, 5, 5,
6, 6, 7, 8, 9, 10, 11, 13, 14, 16,
18, 20, 22, 24
};
const uint8_t g_beta_table_8x8[52] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 20,
22, 24, 26, 28, 30, 32, 34, 36, 38, 40,
42, 44, 46, 48, 50, 52, 54, 56, 58, 60,
62, 64
};
const int8_t g_luma_filter[4][8] =
{
{ 0, 0, 0, 64, 0, 0, 0, 0 },
{ -1, 4, -10, 58, 17, -5, 1, 0 },
{ -1, 4, -11, 40, 40, -11, 4, -1 },
{ 0, 1, -5, 17, 58, -10, 4, -1 }
};
const int8_t g_chroma_filter[8][4] =
{
{ 0, 64, 0, 0 },
{ -2, 58, 10, -2 },
{ -4, 54, 16, -2 },
{ -6, 46, 28, -4 },
{ -4, 36, 36, -4 },
{ -4, 28, 46, -6 },
{ -2, 16, 54, -4 },
{ -2, 10, 58, -2 }
};
//////////////////////////////////////////////////////////////////////////
// FUNCTIONS
/**
* \brief
*/
INLINE void filter_deblock_luma(const encoder_control_t * const encoder, pixel_t *src, int32_t offset,
int32_t tc, int8_t sw,
int8_t part_P_nofilter, int8_t part_Q_nofilter,
int32_t thr_cut,
int8_t filter_second_P, int8_t filter_second_Q)
{
int32_t delta;
int16_t m0 = src[-offset * 4];
int16_t m1 = src[-offset * 3];
int16_t m2 = src[-offset * 2];
int16_t m3 = src[-offset];
int16_t m4 = src[0];
int16_t m5 = src[offset];
int16_t m6 = src[offset * 2];
int16_t m7 = src[offset * 3];
if (sw) {
src[-offset * 3] = CLIP(m1 - 2*tc, m1 + 2*tc, (2*m0 + 3*m1 + m2 + m3 + m4 + 4) >> 3);
src[-offset * 2] = CLIP(m2 - 2*tc, m2 + 2*tc, ( m1 + m2 + m3 + m4 + 2) >> 2);
src[-offset] = CLIP(m3 - 2*tc, m3 + 2*tc, ( m1 + 2*m2 + 2*m3 + 2*m4 + m5 + 4) >> 3);
src[0] = CLIP(m4 - 2*tc, m4 + 2*tc, ( m2 + 2*m3 + 2*m4 + 2*m5 + m6 + 4) >> 3);
src[offset] = CLIP(m5 - 2*tc, m5 + 2*tc, ( m3 + m4 + m5 + m6 + 2) >> 2);
src[offset * 2] = CLIP(m6 - 2*tc, m6 + 2*tc, ( m3 + m4 + m5 + 3*m6 + 2*m7 + 4) >> 3);
} else {
// Weak filter
delta = (9*(m4 - m3) - 3*(m5 - m2) + 8) >> 4;
if (abs(delta) < thr_cut) {
int32_t tc2 = tc >> 1;
delta = CLIP(-tc, tc, delta);
src[-offset] = CLIP(0, (1 << encoder->bitdepth) - 1, (m3 + delta));
src[0] = CLIP(0, (1 << encoder->bitdepth) - 1, (m4 - delta));
if(filter_second_P) {
int32_t delta1 = CLIP(-tc2, tc2, (((m1 + m3 + 1) >> 1) - m2 + delta) >> 1);
src[-offset * 2] = CLIP(0, (1 << encoder->bitdepth) - 1, m2 + delta1);
}
if(filter_second_Q) {
int32_t delta2 = CLIP(-tc2, tc2, (((m6 + m4 + 1) >> 1) - m5 - delta) >> 1);
src[offset] = CLIP(0, (1 << encoder->bitdepth) - 1, m5 + delta2);
}
}
}
if(part_P_nofilter) {
src[-offset] = (uint8_t)m3;
src[-offset*2] = (uint8_t)m2;
src[-offset*3] = (uint8_t)m1;
}
if(part_Q_nofilter) {
src[0] = (uint8_t)m4;
src[offset] = (uint8_t)m5;
src[offset*2] = (uint8_t)m6;
}
}
/**
* \brief
*/
INLINE void filter_deblock_chroma(const encoder_control_t * const encoder, pixel_t *src, int32_t offset, int32_t tc,
int8_t part_P_nofilter, int8_t part_Q_nofilter)
{
int32_t delta;
int16_t m2 = src[-offset * 2];
int16_t m3 = src[-offset];
int16_t m4 = src[0];
int16_t m5 = src[offset];
delta = CLIP(-tc,tc, (((m4 - m3) << 2) + m2 - m5 + 4 ) >> 3);
if(!part_P_nofilter) {
src[-offset] = CLIP(0, (1 << encoder->bitdepth) - 1, m3 + delta);
}
if(!part_Q_nofilter) {
src[0] = CLIP(0, (1 << encoder->bitdepth) - 1, m4 - delta);
}
}
/**
* \brief
*/
void filter_deblock_edge_luma(encoder_state_t * const state,
int32_t xpos, int32_t ypos,
int8_t depth, int8_t dir)
{
videoframe_t * const frame = state->tile->frame;
const encoder_control_t * const encoder = state->encoder_control;
cu_info_t *cu_q = videoframe_get_cu(frame, xpos >> MIN_SIZE, ypos >> MIN_SIZE);
{
// Return if called with a coordinate which is not at CU or TU boundary.
// TODO: Add handling for asymmetric inter CU boundaries which do not coincide
// with transform boundaries.
const int tu_width = LCU_WIDTH >> cu_q->tr_depth;
if (dir == EDGE_HOR && (ypos & (tu_width - 1))) return;
if (dir == EDGE_VER && (xpos & (tu_width - 1))) return;
}
{
int32_t stride = frame->rec->stride;
int32_t offset = stride;
int32_t beta_offset_div2 = encoder->beta_offset_div2;
int32_t tc_offset_div2 = encoder->tc_offset_div2;
// TODO: support 10+bits
pixel_t *orig_src = &frame->rec->y[xpos + ypos*stride];
pixel_t *src = orig_src;
int32_t step = 1;
cu_info_t *cu_p = NULL;
int16_t x_cu = xpos>>MIN_SIZE,y_cu = ypos>>MIN_SIZE;
int8_t strength = 0;
int32_t qp = state->global->QP;
int32_t bitdepth_scale = 1 << (encoder->bitdepth - 8);
int32_t b_index = CLIP(0, 51, qp + (beta_offset_div2 << 1));
int32_t beta = g_beta_table_8x8[b_index] * bitdepth_scale;
int32_t side_threshold = (beta + (beta >>1 )) >> 3;
uint32_t blocks_in_part = (LCU_WIDTH >> depth) / 4;
uint32_t block_idx;
int32_t tc_index,tc,thr_cut;
if (dir == EDGE_VER) {
offset = 1;
step = stride;
}
// TODO: add CU based QP calculation
// For each 4-pixel part in the edge
for (block_idx = 0; block_idx < blocks_in_part; ++block_idx) {
int32_t dp0, dq0, dp3, dq3, d0, d3, dp, dq, d;
{
vector2d_t px = {
(dir == EDGE_HOR ? xpos + block_idx * 4 : xpos),
(dir == EDGE_VER ? ypos + block_idx * 4 : ypos)
};
// Don't deblock the last 4x4 block of the LCU. This will be deblocked
// when processing the next LCU.
if (block_idx > 0 && dir == EDGE_HOR && (px.x + 4) % 64 == 0 && (px.x + 4 != frame->width)) {
continue;
}
// CU in the side we are filtering, update every 8-pixels
cu_p = videoframe_get_cu(frame, x_cu - (dir == EDGE_VER) + (dir == EDGE_HOR ? block_idx>>1 : 0), y_cu - (dir == EDGE_HOR) + (dir == EDGE_VER ? block_idx>>1 : 0));
// Filter strength
strength = 0;
if(cu_q->type == CU_INTRA || cu_p->type == CU_INTRA) {
strength = 2;
} else if(cbf_is_set(cu_q->cbf.y, cu_q->tr_depth) || cbf_is_set(cu_p->cbf.y, cu_p->tr_depth)) {
// Non-zero residual/coeffs and transform boundary
// Neither CU is intra so tr_depth <= MAX_DEPTH.
strength = 1;
} else if (cu_p->inter.mv_dir != 3 && cu_q->inter.mv_dir != 3 && ((abs(cu_q->inter.mv[cu_q->inter.mv_dir - 1][0] - cu_p->inter.mv[cu_p->inter.mv_dir - 1][0]) >= 4) || (abs(cu_q->inter.mv[cu_q->inter.mv_dir - 1][1] - cu_p->inter.mv[cu_p->inter.mv_dir - 1][1]) >= 4))) {
// Absolute motion vector diff between blocks >= 1 (Integer pixel)
strength = 1;
} else if (cu_p->inter.mv_dir != 3 && cu_q->inter.mv_dir != 3 && cu_q->inter.mv_ref[cu_q->inter.mv_dir - 1] != cu_p->inter.mv_ref[cu_p->inter.mv_dir - 1]) {
strength = 1;
}
// B-slice related checks
if(!strength && state->global->slicetype == SLICE_B) {
// Zero all undefined motion vectors for easier usage
if(!(cu_q->inter.mv_dir & 1)) {
cu_q->inter.mv[0][0] = 0;
cu_q->inter.mv[0][1] = 0;
}
if(!(cu_q->inter.mv_dir & 2)) {
cu_q->inter.mv[1][0] = 0;
cu_q->inter.mv[1][1] = 0;
}
if(!(cu_p->inter.mv_dir & 1)) {
cu_p->inter.mv[0][0] = 0;
cu_p->inter.mv[0][1] = 0;
}
if(!(cu_p->inter.mv_dir & 2)) {
cu_p->inter.mv[1][0] = 0;
cu_p->inter.mv[1][1] = 0;
}
const int refP0 = (cu_p->inter.mv_dir & 1) ? cu_p->inter.mv_ref[0] : -1;
const int refP1 = (cu_p->inter.mv_dir & 2) ? cu_p->inter.mv_ref[1] : -1;
const int refQ0 = (cu_q->inter.mv_dir & 1) ? cu_q->inter.mv_ref[0] : -1;
const int refQ1 = (cu_q->inter.mv_dir & 2) ? cu_q->inter.mv_ref[1] : -1;
const int16_t* mvQ0 = cu_q->inter.mv[0];
const int16_t* mvQ1 = cu_q->inter.mv[1];
const int16_t* mvP0 = cu_p->inter.mv[0];
const int16_t* mvP1 = cu_p->inter.mv[1];
if(( refP0 == refQ0 && refP1 == refQ1 ) || ( refP0 == refQ1 && refP1==refQ0 ))
{
// Different L0 & L1
if ( refP0 != refP1 ) {
if ( refP0 == refQ0 ) {
strength = ((abs(mvQ0[0] - mvP0[0]) >= 4) ||
(abs(mvQ0[1] - mvP0[1]) >= 4) ||
(abs(mvQ1[0] - mvP1[0]) >= 4) ||
(abs(mvQ1[1] - mvP1[1]) >= 4)) ? 1 : 0;
} else {
strength = ((abs(mvQ1[0] - mvP0[0]) >= 4) ||
(abs(mvQ1[1] - mvP0[1]) >= 4) ||
(abs(mvQ0[0] - mvP1[0]) >= 4) ||
(abs(mvQ0[1] - mvP1[1]) >= 4)) ? 1 : 0;
}
// Same L0 & L1
} else {
strength = ((abs(mvQ0[0] - mvP0[0]) >= 4) ||
(abs(mvQ0[1] - mvP0[1]) >= 4) ||
(abs(mvQ1[0] - mvP1[0]) >= 4) ||
(abs(mvQ1[1] - mvP1[1]) >= 4)) &&
((abs(mvQ1[0] - mvP0[0]) >= 4) ||
(abs(mvQ1[1] - mvP0[1]) >= 4) ||
(abs(mvQ0[0] - mvP1[0]) >= 4) ||
(abs(mvQ0[1] - mvP1[1]) >= 4)) ? 1 : 0;
}
} else {
strength = 1;
}
}
tc_index = CLIP(0, 51 + 2, (int32_t)(qp + 2*(strength - 1) + (tc_offset_div2 << 1)));
tc = g_tc_table_8x8[tc_index] * bitdepth_scale;
thr_cut = tc * 10;
}
if(!strength) continue;
// Check conditions for filtering
// TODO: Get rid of these inline defines.
#define calc_DP(s,o) abs( (int16_t)s[-o*3] - (int16_t)2*s[-o*2] + (int16_t)s[-o] )
#define calc_DQ(s,o) abs( (int16_t)s[0] - (int16_t)2*s[o] + (int16_t)s[o*2] )
dp0 = calc_DP((src+step*(block_idx*4+0)), offset);
dq0 = calc_DQ((src+step*(block_idx*4+0)), offset);
dp3 = calc_DP((src+step*(block_idx*4+3)), offset);
dq3 = calc_DQ((src+step*(block_idx*4+3)), offset);
d0 = dp0 + dq0;
d3 = dp3 + dq3;
dp = dp0 + dp3;
dq = dq0 + dq3;
d = d0 + d3;
#if ENABLE_PCM
// TODO: add PCM deblocking
#endif
if (d < beta) {
int8_t filter_P = (dp < side_threshold) ? 1 : 0;
int8_t filter_Q = (dq < side_threshold) ? 1 : 0;
// Strong filtering flag checking
#define useStrongFiltering(o,d,s) ( ((abs(s[-o*4]-s[-o]) + abs(s[o*3]-s[0])) < (beta>>3)) && (d<(beta>>2)) && ( abs(s[-o]-s[0]) < ((tc*5+1)>>1)) )
int8_t sw = useStrongFiltering(offset, 2*d0, (src+step*(block_idx*4+0))) &&
useStrongFiltering(offset, 2*d3, (src+step*(block_idx*4+3)));
// Filter four rows/columns
filter_deblock_luma(encoder, src + step * (4*block_idx + 0), offset, tc, sw, 0, 0, thr_cut, filter_P, filter_Q);
filter_deblock_luma(encoder, src + step * (4*block_idx + 1), offset, tc, sw, 0, 0, thr_cut, filter_P, filter_Q);
filter_deblock_luma(encoder, src + step * (4*block_idx + 2), offset, tc, sw, 0, 0, thr_cut, filter_P, filter_Q);
filter_deblock_luma(encoder, src + step * (4*block_idx + 3), offset, tc, sw, 0, 0, thr_cut, filter_P, filter_Q);
}
}
}
}
/**
* \brief
*/
void filter_deblock_edge_chroma(encoder_state_t * const state,
int32_t x, int32_t y,
int8_t depth, int8_t dir)
{
const encoder_control_t * const encoder = state->encoder_control;
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cu_q = videoframe_get_cu_const(frame, x >> (MIN_SIZE - 1), y >> (MIN_SIZE - 1));
// Chroma edges that do not lay on a 8x8 grid are not deblocked.
if (depth >= MAX_DEPTH) {
if (dir == EDGE_HOR && (y & (8 - 1))) return;
if (dir == EDGE_VER && (x & (8 - 1))) return;
}
{
// Return if called with a coordinate which is not at CU or TU boundary.
// TODO: Add handling for asymmetric inter CU boundaries which do not coincide
// with transform boundaries.
const int tu_width = (LCU_WIDTH / 2) >> cu_q->tr_depth;
if (dir == EDGE_HOR && (y & (tu_width - 1))) return;
if (dir == EDGE_VER && (x & (tu_width - 1))) return;
}
// For each subpart
{
int32_t stride = frame->rec->stride >> 1;
int32_t tc_offset_div2 = encoder->tc_offset_div2;
// TODO: support 10+bits
pixel_t *src_u = &frame->rec->u[x + y*stride];
pixel_t *src_v = &frame->rec->v[x + y*stride];
// Init offset and step to EDGE_HOR
int32_t offset = stride;
int32_t step = 1;
const cu_info_t *cu_p = NULL;
int16_t x_cu = x>>(MIN_SIZE-1),y_cu = y>>(MIN_SIZE-1);
int8_t strength = 2;
int32_t QP = g_chroma_scale[state->global->QP];
int32_t bitdepth_scale = 1 << (encoder->bitdepth-8);
int32_t TC_index = CLIP(0, 51+2, (int32_t)(QP + 2*(strength-1) + (tc_offset_div2 << 1)));
int32_t Tc = g_tc_table_8x8[TC_index]*bitdepth_scale;
// Special handling for depth 4. It's meaning is that we want to bypass
// last block in LCU check in order to deblock just that block.
uint32_t blocks_in_part= (LCU_WIDTH>>(depth == 4 ? depth : depth + 1)) / 4;
uint32_t blk_idx;
if(dir == EDGE_VER) {
offset = 1;
step = stride;
}
for (blk_idx = 0; blk_idx < blocks_in_part; ++blk_idx)
{
vector2d_t px = {
(dir == EDGE_HOR ? x + blk_idx * 4 : x),
(dir == EDGE_VER ? y + blk_idx * 4 : y)
};
cu_p = videoframe_get_cu_const(frame, x_cu - (dir == EDGE_VER) + (dir == EDGE_HOR ? blk_idx : 0), y_cu - (dir == EDGE_HOR) + (dir == EDGE_VER ? blk_idx : 0));
// Don't deblock the last 4x4 block of the LCU. This will be deblocked
// when processing the next LCU.
if (depth != 4 && dir == EDGE_HOR && (px.x + 4) % 32 == 0 && (px.x + 4 != frame->width / 2)) {
continue;
}
// Only filter when strenght == 2 (one of the blocks is intra coded)
if (cu_q->type == CU_INTRA || cu_p->type == CU_INTRA) {
// Chroma U
filter_deblock_chroma(encoder, src_u + step * (4*blk_idx + 0), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_u + step * (4*blk_idx + 1), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_u + step * (4*blk_idx + 2), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_u + step * (4*blk_idx + 3), offset, Tc, 0, 0);
// Chroma V
filter_deblock_chroma(encoder, src_v + step * (4*blk_idx + 0), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_v + step * (4*blk_idx + 1), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_v + step * (4*blk_idx + 2), offset, Tc, 0, 0);
filter_deblock_chroma(encoder, src_v + step * (4*blk_idx + 3), offset, Tc, 0, 0);
}
}
}
}
/**
* \brief function to split LCU into smaller CU blocks
* \param encoder the encoder info structure
* \param xCtb block x-position (as SCU)
* \param yCtb block y-position (as SCU)
* \param depth block depth
* \param edge which edge we are filtering
*
* This function takes (SCU) block position as input and splits the block
* until the coded block size has been achived. Calls luma and chroma filtering
* functions for each coded CU size.
*/
void filter_deblock_cu(encoder_state_t * const state, int32_t x, int32_t y, int8_t depth, int32_t edge)
{
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cur_cu = videoframe_get_cu_const(frame, x, y);
uint8_t split_flag = (cur_cu->depth > depth) ? 1 : 0;
uint8_t tr_split = (cur_cu->tr_depth > depth) ? 1 : 0;
uint8_t border_x = (frame->width < x*(LCU_WIDTH >> MAX_DEPTH) + (LCU_WIDTH >> depth)) ? 1 : 0;
uint8_t border_y = (frame->height < y*(LCU_WIDTH >> MAX_DEPTH) + (LCU_WIDTH >> depth)) ? 1 : 0;
uint8_t border_split_x = (frame->width < ((x + 1) * (LCU_WIDTH >> MAX_DEPTH)) + (LCU_WIDTH >> (depth + 1))) ? 0 : 1;
uint8_t border_split_y = (frame->height < ((y + 1) * (LCU_WIDTH >> MAX_DEPTH)) + (LCU_WIDTH >> (depth + 1))) ? 0 : 1;
uint8_t border = border_x | border_y; // are we in any border CU?
// split 64x64, on split flag and on border
if (depth < MAX_DEPTH && (depth == 0 || split_flag || border || tr_split)) {
// Split the four sub-blocks of this block recursively.
uint8_t change;
assert(depth >= 0); // for clang-analyzer
change = 1 << (MAX_DEPTH - 1 - depth);
filter_deblock_cu(state, x, y, depth + 1, edge);
if(!border_x || border_split_x) {
filter_deblock_cu(state, x + change, y, depth + 1, edge);
}
if(!border_y || border_split_y) {
filter_deblock_cu(state, x , y + change, depth + 1, edge);
}
if((!border_x && !border_y) || (border_split_x && border_split_y)) {
filter_deblock_cu(state, x + change, y + change, depth + 1, edge);
}
return;
}
// no filtering on borders (where filter would use pixels outside the picture)
if ((x == 0 && edge == EDGE_VER) || (y == 0 && edge == EDGE_HOR)) return;
// do the filtering for block edge
filter_deblock_edge_luma(state, x*(LCU_WIDTH >> MAX_DEPTH), y*(LCU_WIDTH >> MAX_DEPTH), depth, edge);
filter_deblock_edge_chroma(state, x*(LCU_WIDTH >> (MAX_DEPTH + 1)), y*(LCU_WIDTH >> (MAX_DEPTH + 1)), depth, edge);
}
/**
* \brief Deblock a single LCU without using data from right or down.
*
* Filter all the following edges:
* - All edges within the LCU, except for the last 4 pixels on the right when
* using horizontal filtering.
* - Left edge and top edge.
* - After vertical filtering the left edge, filter the last 4 pixels of
* horizontal edges in the LCU to the left.
*/
void filter_deblock_lcu(encoder_state_t * const state, int x_px, int y_px)
{
const vector2d_t lcu = { x_px / LCU_WIDTH, y_px / LCU_WIDTH };
filter_deblock_cu(state, lcu.x << MAX_DEPTH, lcu.y << MAX_DEPTH, 0, EDGE_VER);
// Filter rightmost 4 pixels from last LCU now that they have been
// finally deblocked vertically.
if (lcu.x > 0) {
int y;
for (y = 0; y < 64; y += 8) {
if (lcu.y + y == 0) continue;
filter_deblock_edge_luma(state, lcu.x * 64 - 4, lcu.y * 64 + y, 4, EDGE_HOR);
}
for (y = 0; y < 32; y += 8) {
if (lcu.y + y == 0) continue;
filter_deblock_edge_chroma(state, lcu.x * 32 - 4, lcu.y * 32 + y, 4, EDGE_HOR);
}
}
filter_deblock_cu(state, lcu.x << MAX_DEPTH, lcu.y << MAX_DEPTH, 0, EDGE_HOR);
}
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