/*****************************************************************************
* 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 .
****************************************************************************/
/*
* \file
*/
#include "filter.h"
#include
#include
#include
#include
#include "config.h"
#include "bitstream.h"
#include "videoframe.h"
#include "cabac.h"
#include "transform.h"
//////////////////////////////////////////////////////////////////////////
// INITIALIZATIONS
const uint8_t kvz_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 kvz_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 kvz_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 kvz_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
*/
static INLINE void kvz_filter_deblock_luma(const encoder_control_t * const encoder,
kvz_pixel *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] = (kvz_pixel)m3;
src[-offset * 2] = (kvz_pixel)m2;
src[-offset * 3] = (kvz_pixel)m1;
}
if(part_Q_nofilter) {
src[0] = (kvz_pixel)m4;
src[offset] = (kvz_pixel)m5;
src[offset * 2] = (kvz_pixel)m6;
}
}
/**
* \brief
*/
static INLINE void kvz_filter_deblock_chroma(const encoder_control_t * const encoder,
kvz_pixel *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 Check wheter an edge is a TU boundary.
*
* \param state encoder state
* \param x x-coordinate of the scu in pixels
* \param y y-coordinate of the scu in pixels
* \param dir direction of the edge to check
* \return true, if the edge is a TU boundary, otherwise false
*/
static bool is_tu_boundary(const encoder_state_t *const state,
int32_t x,
int32_t y,
edge_dir dir)
{
const cu_info_t *const scu = kvz_videoframe_get_cu(state->tile->frame,
x >> MIN_SIZE,
y >> MIN_SIZE);
const int tu_width = LCU_WIDTH >> scu->tr_depth;
if (dir == EDGE_HOR) {
return (y & (tu_width - 1)) == 0;
} else {
return (x & (tu_width - 1)) == 0;
}
}
/**
* \brief Check wheter an edge is aligned on a 8x8 grid.
*
* \param x x-coordinate of the edge
* \param y y-coordinate of the edge
* \param dir direction of the edge
* \return true, if the edge is aligned on a 8x8 grid, otherwise false
*/
static bool is_on_8x8_grid(int x, int y, edge_dir dir)
{
if (dir == EDGE_HOR) {
return (y & 7) == 0;
} else {
return (x & 7) == 0;
}
}
/**
* \brief Apply the deblocking filter to luma pixels on a single edge.
*
* The caller should check that the edge is a TU boundary or a PU boundary.
*
\verbatim
.-- filter this edge if dir == EDGE_HOR
v
+--------+
|o <-- pixel at (x, y)
| |
|<-- filter this edge if dir == EDGE_VER
| |
+--------+
\endverbatim
*
* \param state encoder state
* \param x x-coordinate in pixels (see above)
* \param y y-coordinate in pixels (see above)
* \param length length of the edge in pixels
* \param dir direction of the edge to filter
*/
static void filter_deblock_edge_luma(encoder_state_t * const state,
int32_t x,
int32_t y,
int32_t length,
edge_dir dir)
{
videoframe_t * const frame = state->tile->frame;
const encoder_control_t * const encoder = state->encoder_control;
cu_info_t *cu_q = kvz_videoframe_get_cu(frame, x >> MIN_SIZE, y >> MIN_SIZE);
{
int32_t stride = frame->rec->stride;
int32_t beta_offset_div2 = encoder->beta_offset_div2;
int32_t tc_offset_div2 = encoder->tc_offset_div2;
// TODO: support 10+bits
kvz_pixel *orig_src = &frame->rec->y[x + y*stride];
kvz_pixel *src = orig_src;
cu_info_t *cu_p = NULL;
int16_t x_cu = x >> MIN_SIZE;
int16_t y_cu = y >> 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 = kvz_g_beta_table_8x8[b_index] * bitdepth_scale;
int32_t side_threshold = (beta + (beta >>1 )) >> 3;
int32_t tc_index;
int32_t tc;
int32_t thr_cut;
uint32_t num_4px_parts = length / 4;
const int32_t offset = (dir == EDGE_HOR) ? stride : 1;
const int32_t step = (dir == EDGE_HOR) ? 1 : stride;
// TODO: add CU based QP calculation
// For each 4-pixel part in the edge
for (uint32_t block_idx = 0; block_idx < num_4px_parts; ++block_idx) {
int32_t dp0, dq0, dp3, dq3, d0, d3, dp, dq, d;
{
// CU in the side we are filtering, update every 8-pixels
cu_p = kvz_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 == KVZ_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 = kvz_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
for (int i = 0; i < 4; i++) {
kvz_filter_deblock_luma(encoder, src + step * (4*block_idx + i), offset, tc, sw, 0, 0, thr_cut, filter_P, filter_Q);
}
}
}
}
}
/**
* \brief Apply the deblocking filter to chroma pixels on a single edge.
*
* The caller should check that the edge is a TU boundary or a PU boundary.
*
\verbatim
.-- filter this edge if dir == EDGE_HOR
v
+--------+
|o <-- pixel at (x, y)
| |
|<-- filter this edge if dir == EDGE_VER
| |
+--------+
\endverbatim
*
* \param state encoder state
* \param x x-coordinate in chroma pixels (see above)
* \param y y-coordinate in chroma pixels (see above)
* \param length length of the edge in chroma pixels
* \param dir direction of the edge to filter
*/
static void filter_deblock_edge_chroma(encoder_state_t * const state,
int32_t x,
int32_t y,
int32_t length,
edge_dir dir)
{
const encoder_control_t * const encoder = state->encoder_control;
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cu_q = kvz_videoframe_get_cu_const(frame, x >> (MIN_SIZE - 1), y >> (MIN_SIZE - 1));
// For each subpart
{
int32_t stride = frame->rec->stride >> 1;
int32_t tc_offset_div2 = encoder->tc_offset_div2;
// TODO: support 10+bits
kvz_pixel *src[] = {
&frame->rec->u[x + y*stride],
&frame->rec->v[x + y*stride],
};
const cu_info_t *cu_p = NULL;
int16_t x_cu = x >> (MIN_SIZE-1);
int16_t y_cu = y >> (MIN_SIZE-1);
int8_t strength = 2;
int32_t QP = kvz_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 = kvz_g_tc_table_8x8[TC_index]*bitdepth_scale;
const uint32_t num_4px_parts = length / 4;
const int32_t offset = (dir == EDGE_HOR) ? stride : 1;
const int32_t step = (dir == EDGE_HOR) ? 1 : stride;
for (uint32_t blk_idx = 0; blk_idx < num_4px_parts; ++blk_idx)
{
cu_p = kvz_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));
// Only filter when strenght == 2 (one of the blocks is intra coded)
if (cu_q->type == CU_INTRA || cu_p->type == CU_INTRA) {
for (int component = 0; component < 2; component++) {
for (int i = 0; i < 4; i++) {
kvz_filter_deblock_chroma(encoder, src[component] + step * (4*blk_idx + i), offset, Tc, 0, 0);
}
}
}
}
}
}
/**
* \brief function to split LCU into smaller CU blocks
*
* \param encoder the encoder info structure
* \param x_px block x-position in pixels
* \param y_px block y-position in pixels
* \param depth block depth
* \param dir direction of the edges to filter
*
* Recursively traverse the CU/TU quadtree. At the lowest level, apply the
* deblocking filter to the left edge (when dir == EDGE_VER) or the top edge
* (when dir == EDGE_HOR) as needed. Both luma and chroma are filtered.
*/
static void filter_deblock_cu(encoder_state_t * const state,
int32_t x,
int32_t y,
int8_t depth,
edge_dir dir)
{
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cur_cu = kvz_videoframe_get_cu_const(frame,
x >> MAX_DEPTH,
y >> MAX_DEPTH);
const int cu_width = LCU_WIDTH >> depth;
const int half_cu_width = cu_width >> 1;
const int scu_width = LCU_WIDTH >> MAX_DEPTH;
const bool split_flag = cur_cu->depth > depth;
const bool tr_split = cur_cu->tr_depth > depth;
const bool border_x = frame->width < x + cu_width;
const bool border_y = frame->height < y + cu_width;
const bool border_split_x = frame->width >= x + scu_width + half_cu_width;
const bool border_split_y = frame->height >= y + scu_width + half_cu_width;
const bool 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.
const int32_t x2 = x + half_cu_width;
const int32_t y2 = y + half_cu_width;
filter_deblock_cu(state, x, y, depth + 1, dir);
if (!border_x || border_split_x) {
filter_deblock_cu(state, x2, y, depth + 1, dir);
}
if (!border_y || border_split_y) {
filter_deblock_cu(state, x, y2, depth + 1, dir);
}
if (!border || (border_split_x && border_split_y)) {
filter_deblock_cu(state, x2, y2, depth + 1, dir);
}
return;
}
// no filtering on borders (where filter would use pixels outside the picture)
if ((x == 0 && dir == EDGE_VER) || (y == 0 && dir == EDGE_HOR)) return;
// do the filtering for block edge
if (is_tu_boundary(state, x, y, dir)) {
// Length of luma and chroma edges.
int32_t length;
int32_t length_c;
const int32_t x_right = x + cu_width;
const bool rightmost_4px_of_lcu = x_right % LCU_WIDTH == 0;
const bool rightmost_4px_of_frame = x_right == frame->width;
if (dir == EDGE_HOR &&
rightmost_4px_of_lcu &&
!rightmost_4px_of_frame) {
// The last 4 pixels will be deblocked when processing the next LCU.
length = cu_width - 4;
length_c = half_cu_width - 4;
} else {
length = cu_width;
length_c = half_cu_width;
}
filter_deblock_edge_luma(state, x, y, length, dir);
// Chroma pixel coordinates.
const int32_t x_c = x >> 1;
const int32_t y_c = y >> 1;
if (is_on_8x8_grid(x_c, y_c, dir)) {
filter_deblock_edge_chroma(state, x_c, y_c, length_c, dir);
}
}
}
/**
* \brief Deblock a single LCU without using data from right or down.
*
* Filter the following vertical edges (horizontal filtering):
* 1. The left edge of the LCU.
* 2. All vertical edges within the LCU.
*
* Filter the following horizontal edges (vertical filtering):
* 1. The rightmost 4 pixels of the top edge of the LCU to the left.
* 2. The rightmost 4 pixels of all horizontal edges within the LCU to the
* left.
* 3. The top edge and all horizontal edges within the LCU, excluding the
* rightmost 4 pixels. If the LCU is the rightmost LCU of the frame, the
* last 4 pixels are also filtered.
*
* What is not filtered:
* - The rightmost 4 pixels of the top edge and all horizontal edges within
* the LCU, unless the LCU is the rightmost LCU of the frame.
* - The bottom edge of the LCU.
* - The right edge of the LCU.
*
* \param state encoder state
* \param x_px x-coordinate of the left edge of the LCU in pixels
* \param y_px y-coordinate of the top edge of the LCU in pixels
*/
void kvz_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, x_px, y_px, 0, EDGE_VER);
assert(x_px == lcu.x * LCU_WIDTH);
assert(y_px == lcu.y * LCU_WIDTH);
// Filter rightmost 4 pixels from last LCU now that they have been
// finally deblocked vertically.
if (x_px > 0) {
// Luma
const int x = x_px - 4;
const int end = MIN(y_px + LCU_WIDTH, state->tile->frame->height);
for (int y = y_px; y < end; y += 8) {
// The top edge of the whole frame is not filtered.
if (y > 0 && is_tu_boundary(state, x, y, EDGE_HOR)) {
filter_deblock_edge_luma(state, x, y, 4, EDGE_HOR);
}
}
// Chroma
const int x_px_c = x_px >> 1;
const int y_px_c = y_px >> 1;
const int x_c = x_px_c - 4;
const int end_c = MIN(y_px_c + LCU_WIDTH_C, state->tile->frame->height >> 1);
for (int y_c = y_px_c; y_c < end_c; y_c += 8) {
// The top edge of the whole frame is not filtered.
if (y_c > 0 && is_tu_boundary(state, x_c << 1, y_c << 1, EDGE_HOR)) {
filter_deblock_edge_chroma(state, x_c, y_c, 4, EDGE_HOR);
}
}
}
filter_deblock_cu(state, x_px, y_px, 0, EDGE_HOR);
}