/*****************************************************************************
* 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 .
****************************************************************************/
#include "search_inter.h"
#include
#include
#include "cabac.h"
#include "encoder.h"
#include "image.h"
#include "imagelist.h"
#include "inter.h"
#include "kvazaar.h"
#include "rdo.h"
#include "strategies/strategies-ipol.h"
#include "strategies/strategies-picture.h"
#include "videoframe.h"
/**
* \return True if referred block is within current tile.
*/
static INLINE bool fracmv_within_tile(const encoder_state_t *state, const vector2d_t* orig, int x, int y, int width, int height, int wpp_limit)
{
if (state->encoder_control->cfg.mv_constraint == KVZ_MV_CONSTRAIN_NONE) {
return (wpp_limit == -1 || y + (height << 2) <= (wpp_limit << 2));
};
int margin = 0;
if (state->encoder_control->cfg.mv_constraint == KVZ_MV_CONSTRAIN_FRAME_AND_TILE_MARGIN) {
// Enforce a distance of 8 from any tile boundary.
margin = 4 * 4;
}
// TODO implement KVZ_MV_CONSTRAIN_FRAM and KVZ_MV_CONSTRAIN_TILE.
const vector2d_t abs_mv = { (orig->x << 2) + x, (orig->y << 2) + y };
// Check that both margin and wpp_limit constraints are satisfied.
if (abs_mv.x >= margin && abs_mv.x + (width << 2) <= (state->tile->frame->width << 2) - margin &&
abs_mv.y >= margin && abs_mv.y + (height << 2) <= (state->tile->frame->height << 2) - margin &&
(wpp_limit == -1 || y + (height << 2) <= (wpp_limit << 2)))
{
return true;
} else {
return false;
}
}
static INLINE int get_wpp_limit(const encoder_state_t *state, const vector2d_t* orig)
{
const encoder_control_t *ctrl = state->encoder_control;
if (ctrl->cfg.owf && ctrl->cfg.wpp) {
// Limit motion vectors to the LCU-row below this row.
// To avoid fractional pixel interpolation depending on things outside
// this range, add a margin of 4 pixels.
// - fme needs 4 pixels
// - odd chroma interpolation needs 4 pixels
int wpp_limit = 2 * LCU_WIDTH - 4 - orig->y % LCU_WIDTH;
if (ctrl->cfg.deblock_enable && !ctrl->cfg.sao_enable) {
// As a special case, when deblocking is enabled but SAO is not, we have
// to avoid the possibility of interpolation filters reaching the
// non-deblocked pixels. The deblocking for the horizontal edge on the
// LCU boundary can reach 4 pixels. If SAO is enabled, this WPP-row
// depends on the SAO job, which depends on the deblocking having
// already been done.
wpp_limit -= 4;
}
return wpp_limit;
} else {
return -1;
}
}
/**
* \return True if referred block is within current tile.
*/
static INLINE bool intmv_within_tile(const encoder_state_t *state, const vector2d_t* orig, int x, int y, int width, int height, int wpp_limit)
{
return fracmv_within_tile(state, orig, x << 2, y << 2, width, height, wpp_limit);
}
static unsigned get_ep_ex_golomb_bitcost(unsigned symbol)
{
// Calculate 2 * log2(symbol + 2)
unsigned bins = 0;
symbol += 2;
if (symbol >= 1 << 8) { bins += 16; symbol >>= 8; }
if (symbol >= 1 << 4) { bins += 8; symbol >>= 4; }
if (symbol >= 1 << 2) { bins += 4; symbol >>= 2; }
if (symbol >= 1 << 1) { bins += 2; }
// TODO: It might be a good idea to put a small slope on this function to
// make sure any search function that follows the gradient heads towards
// a smaller MVD, but that would require fractinal costs and bits being
// used everywhere in inter search.
// return num_bins + 0.001 * symbol;
return bins;
}
/**Checks if mv is one of the merge candidates
* \return true if found else return false
*/
static bool mv_in_merge(const inter_merge_cand_t* merge_cand, int16_t num_cand, const vector2d_t* mv)
{
for (int i = 0; i < num_cand; ++i) {
if (merge_cand[i].dir == 3) continue;
const vector2d_t merge_mv = {
merge_cand[i].mv[merge_cand[i].dir - 1][0] >> 2,
merge_cand[i].mv[merge_cand[i].dir - 1][1] >> 2
};
if (merge_mv.x == mv->x && merge_mv.y == mv->y) {
return true;
}
}
return false;
}
static unsigned select_starting_point(int16_t num_cand, inter_merge_cand_t *merge_cand, vector2d_t *mv_in_out, vector2d_t *mv, encoder_state_t *const state,
const vector2d_t *orig, unsigned width, unsigned height, int wpp_limit, const kvz_picture *pic, const kvz_picture *ref,
int16_t mv_cand[2][2], int32_t ref_idx, unsigned best_cost, unsigned *best_index, uint32_t *best_bitcost,
kvz_mvd_cost_func *calc_mvd){
// Go through candidates
for (unsigned i = 0; i < num_cand; ++i) {
if (merge_cand[i].dir == 3) continue;
mv->x = merge_cand[i].mv[merge_cand[i].dir - 1][0] >> 2;
mv->y = merge_cand[i].mv[merge_cand[i].dir - 1][1] >> 2;
if (mv->x == 0 && mv->y == 0) continue;
if (!intmv_within_tile(state, orig, mv->x, mv->y, width, height, wpp_limit)) {
continue;
}
uint32_t bitcost = 0;
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv->y,
width, height, -1);
cost += calc_mvd(state, mv->x, mv->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
*best_index = i;
*best_bitcost = bitcost;
}
}
if (*best_index < num_cand) {
mv->x = merge_cand[*best_index].mv[merge_cand[*best_index].dir - 1][0] >> 2;
mv->y = merge_cand[*best_index].mv[merge_cand[*best_index].dir - 1][1] >> 2;
} else if (*best_index == num_cand) {
mv->x = mv_in_out->x >> 2;
mv->y = mv_in_out->y >> 2;
} else {
mv->x = 0;
mv->y = 0;
}
return best_cost;
}
static uint32_t get_mvd_coding_cost(encoder_state_t * const state, vector2d_t *mvd, const cabac_data_t* cabac)
{
unsigned bitcost = 0;
const vector2d_t abs_mvd = { abs(mvd->x), abs(mvd->y) };
bitcost += CTX_ENTROPY_BITS(&cabac->ctx.cu_mvd_model[0], abs_mvd.x > 0);
if (abs_mvd.x > 0) {
bitcost += CTX_ENTROPY_BITS(&cabac->ctx.cu_mvd_model[1], abs_mvd.x > 1);
if (abs_mvd.x > 1) {
bitcost += get_ep_ex_golomb_bitcost(abs_mvd.x - 2) << CTX_FRAC_BITS;
}
bitcost += CTX_FRAC_ONE_BIT; // sign
}
bitcost += CTX_ENTROPY_BITS(&cabac->ctx.cu_mvd_model[0], abs_mvd.y > 0);
if (abs_mvd.y > 0) {
bitcost += CTX_ENTROPY_BITS(&cabac->ctx.cu_mvd_model[1], abs_mvd.y > 1);
if (abs_mvd.y > 1) {
bitcost += get_ep_ex_golomb_bitcost(abs_mvd.y - 2) << CTX_FRAC_BITS;
}
bitcost += CTX_FRAC_ONE_BIT; // sign
}
// Round and shift back to integer bits.
return (bitcost + CTX_FRAC_HALF_BIT) >> CTX_FRAC_BITS;
}
static int calc_mvd_cost(encoder_state_t * const state, int x, int y, int mv_shift,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand,int32_t ref_idx, uint32_t *bitcost)
{
uint32_t temp_bitcost = 0;
uint32_t merge_idx;
int cand1_cost,cand2_cost;
vector2d_t mvd_temp1, mvd_temp2;
int8_t merged = 0;
int8_t cur_mv_cand = 0;
x <<= mv_shift;
y <<= mv_shift;
// Check every candidate to find a match
for(merge_idx = 0; merge_idx < (uint32_t)num_cand; merge_idx++) {
if (merge_cand[merge_idx].dir == 3) continue;
if (merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][0] == x &&
merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][1] == y &&
merge_cand[merge_idx].ref[merge_cand[merge_idx].dir - 1] == ref_idx) {
temp_bitcost += merge_idx;
merged = 1;
break;
}
}
// Check mvd cost only if mv is not merged
if(!merged) {
mvd_temp1.x = x - mv_cand[0][0];
mvd_temp1.y = y - mv_cand[0][1];
cand1_cost = get_mvd_coding_cost(state, &mvd_temp1, &state->cabac);
mvd_temp2.x = x - mv_cand[1][0];
mvd_temp2.y = y - mv_cand[1][1];
cand2_cost = get_mvd_coding_cost(state, &mvd_temp2, &state->cabac);
// Select candidate 1 if it has lower cost
if (cand2_cost < cand1_cost) {
cur_mv_cand = 1;
}
temp_bitcost += cur_mv_cand ? cand2_cost : cand1_cost;
}
*bitcost = temp_bitcost;
return temp_bitcost*(int32_t)(state->lambda_sqrt + 0.5);
}
static bool early_terminate(int16_t num_cand, inter_merge_cand_t *merge_cand, vector2d_t *mv_in_out, vector2d_t *mv, encoder_state_t *const state,
const vector2d_t *orig, unsigned width, unsigned height, int wpp_limit, const kvz_picture *pic, const kvz_picture *ref,
int16_t mv_cand[2][2], int32_t ref_idx, unsigned *best_cost, uint32_t *bitcost_out, uint32_t *best_bitcost,
kvz_mvd_cost_func *calc_mvd)
{
static const vector2d_t small_hexbs[5] = {
{ 0, 0 },
{ 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 },
};
double multiplier = 1;
// If early termination is set to fast set multiplier to 0.9
if (state->encoder_control->cfg.me_early_termination == KVZ_ME_EARLY_TERMINATION_SENSITIVE){
multiplier = 0.95;
}
const vector2d_t *offset;
for (int k = 0; k < 2; ++k){
unsigned best_index = 0;
for (int i = 1; i < 5; ++i) {
offset = &small_hexbs[i];
if (!intmv_within_tile(state, orig, mv->x + offset->x, mv->y + offset->y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv->x + offset->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv->y + offset->y,
width, height, -1);
unsigned bitcost;
cost += calc_mvd(state, mv->x + offset->x, mv->y + offset->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < multiplier * *best_cost ) {
*best_cost = cost;
best_index = i;
*best_bitcost = bitcost;
}
}
// Adjust the movement vector
mv->x += small_hexbs[best_index].x;
mv->y += small_hexbs[best_index].y;
// if best match is at center we stop the search
if (best_index == 0){
// Return final movement vector in quarter-pixel precision.
mv_in_out->x = mv->x << 2;
mv_in_out->y = mv->y << 2;
*bitcost_out = *best_bitcost;
return true;
}
}
return false;
}
unsigned kvz_tz_pattern_search(encoder_state_t * const state, const kvz_picture *pic, const kvz_picture *ref, unsigned pattern_type,
const vector2d_t *orig, const int iDist, vector2d_t *mv, unsigned best_cost, int *best_dist,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS], int16_t num_cand, int32_t ref_idx, uint32_t *best_bitcost,
int width, int height, int wpp_limit)
{
int n_points;
int best_index = -1;
int i;
vector2d_t mv_best = { 0, 0 };
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
assert(pattern_type < 4);
//implemented search patterns
vector2d_t pattern[4][8] = {
//diamond (8 points)
//[ ][ ][ ][ ][1][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][8][ ][ ][ ][5][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[4][ ][ ][ ][o][ ][ ][ ][2]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][7][ ][ ][ ][6][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][3][ ][ ][ ][ ]
{
{ 0, iDist }, { iDist, 0 }, { 0, -iDist }, { -iDist, 0 },
{ iDist / 2, iDist / 2 }, { iDist / 2, -iDist / 2 }, { -iDist / 2, -iDist / 2 }, { -iDist / 2, iDist / 2 }
},
//square (8 points)
//[8][ ][ ][ ][1][ ][ ][ ][2]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[7][ ][ ][ ][o][ ][ ][ ][3]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[6][ ][ ][ ][5][ ][ ][ ][4]
{
{ 0, iDist }, { iDist, iDist }, { iDist, 0 }, { iDist, -iDist }, { 0, -iDist },
{ -iDist, -iDist }, { -iDist, 0 }, { -iDist, iDist }
},
//octagon (8 points)
//[ ][ ][5][ ][ ][ ][1][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][2]
//[4][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][o][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[8][ ][ ][ ][ ][ ][ ][ ][6]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][7][ ][ ][ ][3][ ][ ]
{
{ iDist / 2, iDist }, { iDist, iDist / 2 }, { iDist / 2, -iDist }, { -iDist, iDist / 2 },
{ -iDist / 2, iDist }, { iDist, -iDist / 2 }, { -iDist / 2, -iDist }, { -iDist, -iDist / 2 }
},
//hexagon (6 points)
//[ ][ ][5][ ][ ][ ][1][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[4][ ][ ][ ][o][ ][ ][ ][2]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][ ][ ][ ][ ][ ][ ][ ]
//[ ][ ][6][ ][ ][ ][3][ ][ ]
{
{ iDist / 2, iDist }, { iDist, 0 }, { iDist / 2, -iDist }, { -iDist, 0 },
{ iDist / 2, iDist }, { -iDist / 2, -iDist }, { 0, 0 }, { 0, 0 }
}
};
//set the number of points to be checked
if (iDist == 1)
{
switch (pattern_type)
{
case 0:
n_points = 4;
break;
case 2:
n_points = 4;
break;
case 3:
n_points = 4;
break;
default:
n_points = 8;
break;
};
}
else
{
switch (pattern_type)
{
case 3:
n_points = 6;
break;
default:
n_points = 8;
break;
};
}
//compute SAD values for all chosen points
for (i = 0; i < n_points; i++)
{
vector2d_t *current = &pattern[pattern_type][i];
if (!intmv_within_tile(state, orig, mv->x + current->x, mv->y + current->y, width, height, wpp_limit)) {
continue;
}
unsigned cost;
uint32_t bitcost;
{
cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv->x + current->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv->y + current->y,
width, height, -1);
cost += calc_mvd(state, mv->x + current->x, mv->y + current->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
}
if (cost < best_cost)
{
best_cost = cost;
*best_bitcost = bitcost;
best_index = i;
}
}
if (best_index >= 0)
{
mv_best = pattern[pattern_type][best_index];
*best_dist = iDist;
}
mv->x += mv_best.x;
mv->y += mv_best.y;
return best_cost;
}
unsigned kvz_tz_raster_search(encoder_state_t * const state, const kvz_picture *pic, const kvz_picture *ref,
const vector2d_t *orig, vector2d_t *mv, unsigned best_cost,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS], int16_t num_cand, int32_t ref_idx, uint32_t *best_bitcost,
int width, int height, int iSearchRange, int iRaster, int wpp_limit)
{
int i;
int k;
vector2d_t mv_best = { 0, 0 };
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
//compute SAD values for every point in the iRaster downsampled version of the current search area
for (i = iSearchRange; i >= -iSearchRange; i -= iRaster)
{
for (k = -iSearchRange; k <= iSearchRange; k += iRaster)
{
vector2d_t current = { k, i };
if (!intmv_within_tile(state, orig, mv->x + current.x, mv->y + current.y, width, height, wpp_limit)) {
continue;
}
unsigned cost;
uint32_t bitcost;
{
cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv->x + k,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv->y + i,
width, height, -1);
cost += calc_mvd(state, mv->x + k, mv->y + i, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
}
if (cost < best_cost)
{
best_cost = cost;
*best_bitcost = bitcost;
mv_best = current;
}
}
}
mv->x += mv_best.x;
mv->y += mv_best.y;
return best_cost;
}
static unsigned tz_search(encoder_state_t * const state,
unsigned width, unsigned height,
const kvz_picture *pic, const kvz_picture *ref,
const vector2d_t *orig, vector2d_t *mv_in_out,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand, int32_t ref_idx, uint32_t *bitcost_out)
{
//TZ parameters
const int iSearchRange = 96; // search range for each stage
const int iRaster = 5; // search distance limit and downsampling factor for step 3
const unsigned step2_type = 0; // search patterns for steps 2 and 4
const unsigned step4_type = 0;
const bool bRasterRefinementEnable = true; // enable step 4 mode 1
const bool bStarRefinementEnable = false; // enable step 4 mode 2 (only one mode will be executed)
vector2d_t mv = { mv_in_out->x >> 2, mv_in_out->y >> 2 };
unsigned best_cost = UINT32_MAX;
uint32_t best_bitcost = 0;
int iDist;
int best_dist = 0;
unsigned best_index = num_cand + 1;
int wpp_limit = get_wpp_limit(state, orig);
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
// Check the 0-vector, so we can ignore all 0-vectors in the merge cand list.
if (intmv_within_tile(state, orig, 0, 0, width, height, wpp_limit)) {
best_cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y,
width, height, -1);
best_cost += calc_mvd(state, 0, 0, 2, mv_cand, merge_cand, num_cand, ref_idx, &best_bitcost);
best_index = num_cand + 1;
}
// Check mv_in if it's not one of the merge candidates.
if (!mv_in_merge(merge_cand, num_cand, &mv) &&
intmv_within_tile(state, orig, mv.x, mv.y, width, height, wpp_limit))
{
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv.x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv.y,
width, height, -1);
unsigned bitcost;
cost += calc_mvd(state, mv.x, mv.y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_index = num_cand;
best_bitcost = bitcost;
}
}
// Select starting point from among merge candidates. These should include
// both mv_cand vectors and (0, 0).
best_cost = select_starting_point(num_cand, merge_cand, mv_in_out, &mv, state, orig, width, height, wpp_limit,
pic, ref, mv_cand, ref_idx, best_cost, &best_index, &best_bitcost, calc_mvd);
// Check if we should stop search
if (state->encoder_control->cfg.me_early_termination){
if (early_terminate(num_cand, merge_cand, mv_in_out, &mv, state, orig, width, height, wpp_limit,
pic, ref, mv_cand, ref_idx, &best_cost, bitcost_out, &best_bitcost, calc_mvd)) return best_cost;
}
//step 2, grid search
for (iDist = 1; iDist <= iSearchRange; iDist *= 2)
{
best_cost = kvz_tz_pattern_search(state, pic, ref, step2_type, orig, iDist, &mv, best_cost, &best_dist,
mv_cand, merge_cand, num_cand, ref_idx, &best_bitcost, width, height, wpp_limit);
}
//step 3, raster scan
if (best_dist > iRaster)
{
best_dist = iRaster;
best_cost = kvz_tz_raster_search(state, pic, ref, orig, &mv, best_cost, mv_cand, merge_cand,
num_cand, ref_idx, &best_bitcost, width, height, iSearchRange, iRaster, wpp_limit);
}
//step 4
//raster refinement
if (bRasterRefinementEnable && best_dist > 0)
{
iDist = best_dist >> 1;
while (iDist > 0)
{
best_cost = kvz_tz_pattern_search(state, pic, ref, step4_type, orig, iDist, &mv, best_cost, &best_dist,
mv_cand, merge_cand, num_cand, ref_idx, &best_bitcost, width, height, wpp_limit);
iDist = iDist >> 1;
}
}
//star refinement (repeat step 2 for the current starting point)
if (bStarRefinementEnable && best_dist > 0)
{
for (iDist = 1; iDist <= iSearchRange; iDist *= 2)
{
best_cost = kvz_tz_pattern_search(state, pic, ref, step4_type, orig, iDist, &mv, best_cost, &best_dist,
mv_cand, merge_cand, num_cand, ref_idx, &best_bitcost, width, height, wpp_limit);
}
}
mv.x = mv.x << 2;
mv.y = mv.y << 2;
*mv_in_out = mv;
*bitcost_out = best_bitcost;
return best_cost;
}
/**
* \brief Do motion search using the HEXBS algorithm.
*
* \param width width of the block to search
* \param height height of the block to search
* \param pic Picture motion vector is searched for.
* \param ref Picture motion vector is searched from.
* \param orig Top left corner of the searched for block.
* \param mv_in_out Predicted mv in and best out. Quarter pixel precision.
*
* \returns Cost of the motion vector.
*
* Motion vector is searched by first searching iteratively with the large
* hexagon pattern until the best match is at the center of the hexagon.
* As a final step a smaller hexagon is used to check the adjacent pixels.
*
* If a non 0,0 predicted motion vector predictor is given as mv_in_out,
* the 0,0 vector is also tried. This is hoped to help in the case where
* the predicted motion vector is way off. In the future even more additional
* points like 0,0 might be used, such as vectors from top or left.
*/
static unsigned hexagon_search(encoder_state_t * const state,
unsigned width, unsigned height,
const kvz_picture *pic, const kvz_picture *ref,
const vector2d_t *orig, vector2d_t *mv_in_out,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand, int32_t ref_idx, uint32_t *bitcost_out)
{
// The start of the hexagonal pattern has been repeated at the end so that
// the indices between 1-6 can be used as the start of a 3-point list of new
// points to search.
// 6--1,7
// / \ =)
// 5 0 2,8
// \ /
// 4---3
static const vector2d_t large_hexbs[9] = {
{ 0, 0 },
{ 1, -2 }, { 2, 0 }, { 1, 2 }, { -1, 2 }, { -2, 0 }, { -1, -2 },
{ 1, -2 }, { 2, 0 }
};
// This is used as the last step of the hexagon search.
// 1
// 2 0 3
// 4
static const vector2d_t small_hexbs[5] = {
{ 0, 0 },
{ 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }
};
vector2d_t mv = { mv_in_out->x >> 2, mv_in_out->y >> 2 };
unsigned best_cost = UINT32_MAX;
uint32_t best_bitcost = 0, bitcost;
unsigned i;
// Current best index, either to merge_cands, large_hebx or small_hexbs.
unsigned best_index = num_cand + 1;
int wpp_limit = get_wpp_limit(state, orig);
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
// Check the 0-vector, so we can ignore all 0-vectors in the merge cand list.
if (intmv_within_tile(state, orig, 0, 0, width, height, wpp_limit)) {
best_cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y,
width, height, -1);
best_cost += calc_mvd(state, 0, 0, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
best_bitcost = bitcost;
best_index = num_cand + 1;
}
// Check mv_in if it's not one of the merge candidates.
if (!mv_in_merge(merge_cand, num_cand, &mv) &&
intmv_within_tile(state, orig, mv.x, mv.y, width, height, wpp_limit))
{
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv.x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv.y,
width, height, -1);
cost += calc_mvd(state, mv.x, mv.y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_index = num_cand;
best_bitcost = bitcost;
}
}
// Select starting point from among merge candidates. These should include
// both mv_cand vectors and (0, 0).
best_cost = select_starting_point(num_cand, merge_cand, mv_in_out, &mv, state, orig, width, height, wpp_limit,
pic, ref, mv_cand, ref_idx, best_cost, &best_index, &best_bitcost, calc_mvd);
// Check if we should stop search
if (state->encoder_control->cfg.me_early_termination){
if (early_terminate(num_cand, merge_cand, mv_in_out, &mv, state, orig, width, height, wpp_limit,
pic, ref, mv_cand, ref_idx, &best_cost, bitcost_out, &best_bitcost, calc_mvd)) return best_cost;
}
// Search the initial 7 points of the hexagon.
best_index = 0;
for (i = 0; i < 7; ++i) {
const vector2d_t *pattern = &large_hexbs[i];
if (!intmv_within_tile(state, orig, mv.x + pattern->x, mv.y + pattern->y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv.x + pattern->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv.y + pattern->y,
width, height, -1);
cost += calc_mvd(state, mv.x + pattern->x, mv.y + pattern->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_index = i;
best_bitcost = bitcost;
}
}
// Iteratively search the 3 new points around the best match, until the best
// match is in the center.
while (best_index != 0) {
unsigned start; // Starting point of the 3 offsets to be searched.
if (best_index == 1) {
start = 6;
} else if (best_index == 8) {
start = 1;
} else {
start = best_index - 1;
}
// Move the center to the best match.
mv.x += large_hexbs[best_index].x;
mv.y += large_hexbs[best_index].y;
best_index = 0;
// Iterate through the next 3 points.
for (i = 0; i < 3; ++i) {
const vector2d_t *offset = &large_hexbs[start + i];
if (!intmv_within_tile(state, orig, mv.x + offset->x, mv.y + offset->y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv.x + offset->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv.y + offset->y,
width, height, -1);
cost += calc_mvd(state, mv.x + offset->x, mv.y + offset->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_index = start + i;
best_bitcost = bitcost;
}
}
}
// Move the center to the best match.
mv.x += large_hexbs[best_index].x;
mv.y += large_hexbs[best_index].y;
best_index = 0;
// Do the final step of the search with a small pattern.
for (i = 1; i < 5; ++i) {
const vector2d_t *offset = &small_hexbs[i];
if (!intmv_within_tile(state, orig, mv.x + offset->x, mv.y + offset->y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
(state->tile->lcu_offset_x * LCU_WIDTH) + orig->x + mv.x + offset->x,
(state->tile->lcu_offset_y * LCU_WIDTH) + orig->y + mv.y + offset->y,
width, height, -1);
cost += calc_mvd(state, mv.x + offset->x, mv.y + offset->y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost > 0 && cost < best_cost) {
best_cost = cost;
best_index = i;
best_bitcost = bitcost;
}
}
// Adjust the movement vector according to the final best match.
mv.x += small_hexbs[best_index].x;
mv.y += small_hexbs[best_index].y;
// Return final movement vector in quarter-pixel precision.
mv_in_out->x = mv.x << 2;
mv_in_out->y = mv.y << 2;
*bitcost_out = best_bitcost;
return best_cost;
}
static unsigned search_mv_full(encoder_state_t * const state,
unsigned width, unsigned height,
const kvz_picture *pic, const kvz_picture *ref,
const vector2d_t *orig, vector2d_t *mv_in_out,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand, int32_t ref_idx, const int32_t search_range, uint32_t *bitcost_out)
{
vector2d_t mv = { mv_in_out->x >> 2, mv_in_out->y >> 2 };
vector2d_t best_mv = { 0, 0 };
unsigned best_cost = UINT32_MAX;
uint32_t best_bitcost = 0, bitcost;
int wpp_limit = get_wpp_limit(state, orig);
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
// Check the 0-vector, so we can ignore all 0-vectors in the merge cand list.
if (intmv_within_tile(state, orig, 0, 0, width, height, wpp_limit)) {
vector2d_t min_mv = { 0 - search_range, 0 - search_range };
vector2d_t max_mv = { 0 + search_range, 0 + search_range };
for (int y = min_mv.y; y <= max_mv.y; ++y) {
for (int x = min_mv.x; x <= max_mv.x; ++x) {
if (!intmv_within_tile(state, orig, x, y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
orig->x + x,
orig->y + y,
width, height, -1);
cost += calc_mvd(state, x, y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_bitcost = bitcost;
best_mv.x = x;
best_mv.y = y;
}
}
}
}
// Check mv_in if it's not one of the merge candidates.
if (!mv_in_merge(merge_cand, num_cand, &mv) &&
intmv_within_tile(state, orig, mv.x, mv.y, width, height, wpp_limit))
{
vector2d_t min_mv = { mv.x - search_range, mv.y - search_range };
vector2d_t max_mv = { mv.x + search_range, mv.y + search_range };
for (int y = min_mv.y; y <= max_mv.y; ++y) {
for (int x = min_mv.x; x <= max_mv.x; ++x) {
if (!intmv_within_tile(state, orig, x, y, width, height, wpp_limit)) {
continue;
}
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
orig->x + x,
orig->y + y,
width, height, -1);
cost += calc_mvd(state, x, y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_bitcost = bitcost;
best_mv.x = x;
best_mv.y = y;
}
}
}
}
// Select starting point from among merge candidates. These should include
// both mv_cand vectors and (0, 0).
for (int i = 0; i < num_cand; ++i) {
if (merge_cand[i].dir == 3) continue;
mv.x = merge_cand[i].mv[merge_cand[i].dir - 1][0] >> 2;
mv.y = merge_cand[i].mv[merge_cand[i].dir - 1][1] >> 2;
// Ignore 0-vector because it has already been checked.
if (mv.x == 0 && mv.y == 0) continue;
vector2d_t min_mv = { mv.x - search_range, mv.y - search_range };
vector2d_t max_mv = { mv.x + search_range, mv.y + search_range };
for (int y = min_mv.y; y <= max_mv.y; ++y) {
for (int x = min_mv.x; x <= max_mv.x; ++x) {
if (!intmv_within_tile(state, orig, x, y, width, height, wpp_limit)) {
continue;
}
// Avoid calculating the same points over and over again.
bool already_tested = false;
for (int j = -1; j < i; ++j) {
int xx = 0;
int yy = 0;
if (j >= 0) {
if (merge_cand[j].dir == 3) continue;
xx = merge_cand[j].mv[merge_cand[j].dir - 1][0] >> 2;
yy = merge_cand[j].mv[merge_cand[j].dir - 1][1] >> 2;
}
if (x >= xx - search_range && x <= xx + search_range &&
y >= yy - search_range && y <= yy + search_range)
{
already_tested = true;
x = xx + search_range;
break;
}
}
if (already_tested) continue;
unsigned cost = kvz_image_calc_sad(pic, ref, orig->x, orig->y,
orig->x + x,
orig->y + y,
width, height, -1);
cost += calc_mvd(state, x, y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcost);
if (cost < best_cost) {
best_cost = cost;
best_bitcost = bitcost;
best_mv.x = x;
best_mv.y = y;
}
}
}
}
mv_in_out->x = best_mv.x << 2;
mv_in_out->y = best_mv.y << 2;
*bitcost_out = best_bitcost;
return best_cost;
}
/**
* \brief Do fractional motion estimation
*
* \param width width of the block
* \param height height of the block
* \param pic Picture motion vector is searched for.
* \param ref Picture motion vector is searched from.
* \param orig Top left corner of the searched for block.
* \param mv_in_out Predicted mv in and best out. Quarter pixel precision.
*
* \returns Cost of the motion vector.
*
* Algoritm first searches 1/2-pel positions around integer mv and after best match is found,
* refines the search by searching best 1/4-pel postion around best 1/2-pel position.
*/
static unsigned search_frac(encoder_state_t * const state,
unsigned width, unsigned height,
const kvz_picture *pic, const kvz_picture *ref,
const vector2d_t *orig, vector2d_t *mv_in_out,
int16_t mv_cand[2][2], inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand, int32_t ref_idx, uint32_t *bitcost_out)
{
// Map indexes to relative coordinates in the following way:
// 5 3 6
// 1 0 2
// 7 4 8
static const vector2d_t square[9] = {
{ 0, 0 }, { -1, 0 }, { 1, 0 },
{ 0, -1 }, { 0, 1 }, { -1, -1 },
{ 1, -1 }, { -1, 1 }, { 1, 1 }
};
int wpp_limit = get_wpp_limit(state, orig);
//Set mv to halfpel precision
vector2d_t mv = { mv_in_out->x >> 2, mv_in_out->y >> 2 };
unsigned best_cost = UINT32_MAX;
uint32_t best_bitcost = 0;
uint32_t bitcosts[4] = { 0 };
unsigned i;
unsigned best_index = 0;
unsigned costs[4] = { 0 };
kvz_extended_block src = { 0, 0, 0, 0 };
// Buffers for interpolated fractional pixels one
// for each position excluding the integer position.
// Has one extra column on left and row on top because
// samples are used also from those integer pixels when
// searching positions to the left and up.
frac_search_block fracpel_blocks[15];
kvz_pixel *hpel_pos[8];
// Horizontal hpel positions
hpel_pos[0] = fracpel_blocks[HPEL_POS_HOR] + (LCU_WIDTH + 1);
hpel_pos[1] = fracpel_blocks[HPEL_POS_HOR] + (LCU_WIDTH + 1) + 1;
// Vertical hpel positions
hpel_pos[2] = fracpel_blocks[HPEL_POS_VER] + 1;
hpel_pos[3] = fracpel_blocks[HPEL_POS_VER] + (LCU_WIDTH + 1) + 1;
// Diagonal hpel positions
hpel_pos[4] = fracpel_blocks[HPEL_POS_DIA];
hpel_pos[5] = fracpel_blocks[HPEL_POS_DIA] + 1;
hpel_pos[6] = fracpel_blocks[HPEL_POS_DIA] + (LCU_WIDTH + 1);
hpel_pos[7] = fracpel_blocks[HPEL_POS_DIA] + (LCU_WIDTH + 1) + 1;
int fme_level = state->encoder_control->cfg.fme_level;
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
kvz_get_extended_block(orig->x, orig->y, mv.x-1, mv.y-1,
state->tile->lcu_offset_x * LCU_WIDTH,
state->tile->lcu_offset_y * LCU_WIDTH,
ref->y, ref->width, ref->height, FILTER_SIZE, width+1, height+1, &src);
kvz_filter_frac_blocks_luma(state->encoder_control, src.orig_topleft, src.stride, width,
height, fracpel_blocks, fme_level);
kvz_pixel tmp_pic[LCU_WIDTH*LCU_WIDTH];
kvz_pixels_blit(pic->y + orig->y * pic->stride + orig->x, tmp_pic, width, height, pic->stride, width);
// Search integer position
costs[0] = kvz_satd_any_size(width, height,
tmp_pic, width,
src.orig_topleft + src.stride + 1, src.stride);
costs[0] += calc_mvd(state, mv.x, mv.y, 2, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[0]);
best_cost = costs[0];
best_bitcost = bitcosts[0];
int last_hpel_index = (fme_level == 1) ? 4 : 8;
//Set mv to half-pixel precision
mv.x <<= 1;
mv.y <<= 1;
// Search halfpel positions around best integer mv
for (i = 1; i <= last_hpel_index; i+=4) {
const vector2d_t *pattern[4] = { &square[i], &square[i + 1], &square[i + 2], &square[i + 3] };
int8_t within_tile[4] = {
fracmv_within_tile(state, orig, (mv.x + pattern[0]->x) << 1, (mv.y + pattern[0]->y) << 1, width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[1]->x) << 1, (mv.y + pattern[1]->y) << 1, width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[2]->x) << 1, (mv.y + pattern[2]->y) << 1, width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[3]->x) << 1, (mv.y + pattern[3]->y) << 1, width, height, wpp_limit),
};
int hpel_strides[4] = {
(LCU_WIDTH + 1),
(LCU_WIDTH + 1),
(LCU_WIDTH + 1),
(LCU_WIDTH + 1)
};
kvz_satd_any_size_quad(width, height, (const kvz_pixel**)(hpel_pos + i - 1), hpel_strides, tmp_pic, width, 4, costs, within_tile);
costs[0] += calc_mvd(state, mv.x + pattern[0]->x, mv.y + pattern[0]->y, 1, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[0]);
costs[1] += calc_mvd(state, mv.x + pattern[1]->x, mv.y + pattern[1]->y, 1, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[1]);
costs[2] += calc_mvd(state, mv.x + pattern[2]->x, mv.y + pattern[2]->y, 1, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[2]);
costs[3] += calc_mvd(state, mv.x + pattern[3]->x, mv.y + pattern[3]->y, 1, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[3]);
for (int j = 0; j < 4; ++j) {
if (within_tile[j] && costs[j] < best_cost) {
best_cost = costs[j];
best_index = i + j;
best_bitcost = bitcosts[j];
}
}
}
unsigned int best_hpel_index = best_index;
// Move search to best_index
mv.x += square[best_index].x;
mv.y += square[best_index].y;
//Set mv to quarterpel precision
mv.x <<= 1;
mv.y <<= 1;
if (fme_level >= 3) {
best_index = 0;
int last_qpel_index = (fme_level == 3) ? 4 : 8;
//Search quarterpel points around best halfpel mv
for (i = 1; i <= last_qpel_index; i += 4) {
const vector2d_t *pattern[4] = { &square[i], &square[i + 1], &square[i + 2], &square[i + 3] };
int8_t within_tile[4] = {
fracmv_within_tile(state, orig, (mv.x + pattern[0]->x), (mv.y + pattern[0]->y), width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[1]->x), (mv.y + pattern[1]->y), width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[2]->x), (mv.y + pattern[2]->y), width, height, wpp_limit),
fracmv_within_tile(state, orig, (mv.x + pattern[3]->x), (mv.y + pattern[3]->y), width, height, wpp_limit),
};
int qpel_indices[4] = { 0 };
int int_offset_x[4] = { 0 };
int int_offset_y[4] = { 0 };
for (int j = 0; j < 4; ++j) {
int hpel_offset_x = square[best_hpel_index].x;
int hpel_offset_y = square[best_hpel_index].y;
int qpel_offset_x = 2 * hpel_offset_x + pattern[j]->x;
int qpel_offset_y = 2 * hpel_offset_y + pattern[j]->y;
unsigned qpel_filter_x = (qpel_offset_x + 4) % 4;
unsigned qpel_filter_y = (qpel_offset_y + 4) % 4;
// The first value (-1) is for the integer position and
// it will not be used
int filters_to_block_idx[4][4] = {
{ -1, 3, 0, 4 },
{ 7, 11, 8, 12 },
{ 1, 5, 2, 6 },
{ 9, 13, 10, 14 }
};
qpel_indices[j] = filters_to_block_idx[qpel_filter_y][qpel_filter_x];
// Select values filtered from correct integer samples
int_offset_x[j] = qpel_offset_x >= 0;
int_offset_y[j] = qpel_offset_y >= 0;
}
kvz_pixel *qpel_pos[4] = {
fracpel_blocks[qpel_indices[0]] + int_offset_y[0] * (LCU_WIDTH + 1) + int_offset_x[0],
fracpel_blocks[qpel_indices[1]] + int_offset_y[1] * (LCU_WIDTH + 1) + int_offset_x[1],
fracpel_blocks[qpel_indices[2]] + int_offset_y[2] * (LCU_WIDTH + 1) + int_offset_x[2],
fracpel_blocks[qpel_indices[3]] + int_offset_y[3] * (LCU_WIDTH + 1) + int_offset_x[3]
};
int qpel_strides[4] = {
(LCU_WIDTH + 1),
(LCU_WIDTH + 1),
(LCU_WIDTH + 1),
(LCU_WIDTH + 1)
};
kvz_satd_any_size_quad(width, height, (const kvz_pixel**)qpel_pos, qpel_strides, tmp_pic, width, 4, costs, within_tile);
costs[0] += calc_mvd(state, mv.x + pattern[0]->x, mv.y + pattern[0]->y, 0, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[0]);
costs[1] += calc_mvd(state, mv.x + pattern[1]->x, mv.y + pattern[1]->y, 0, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[1]);
costs[2] += calc_mvd(state, mv.x + pattern[2]->x, mv.y + pattern[2]->y, 0, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[2]);
costs[3] += calc_mvd(state, mv.x + pattern[3]->x, mv.y + pattern[3]->y, 0, mv_cand, merge_cand, num_cand, ref_idx, &bitcosts[3]);
for (int j = 0; j < 4; ++j) {
if (within_tile[j] && costs[j] < best_cost) {
best_cost = costs[j];
best_index = i + j;
best_bitcost = bitcosts[j];
}
}
}
//Set mv to best final best match
mv.x += square[best_index].x;
mv.y += square[best_index].y;
}
mv_in_out->x = mv.x;
mv_in_out->y = mv.y;
*bitcost_out = best_bitcost;
if (src.malloc_used) free(src.buffer);
return best_cost;
}
/**
* \brief Perform inter search for a single reference frame.
*/
static void search_pu_inter_ref(encoder_state_t * const state,
int x, int y,
int width, int height,
int depth,
lcu_t *lcu, cu_info_t *cur_cu,
int16_t mv_cand[2][2],
inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand,
unsigned ref_idx,
uint32_t(*get_mvd_cost)(encoder_state_t * const, vector2d_t *, const cabac_data_t*),
double *inter_cost,
uint32_t *inter_bitcost)
{
const videoframe_t * const frame = state->tile->frame;
kvz_picture *ref_image = state->frame->ref->images[ref_idx];
const vector2d_t orig = { x, y };
uint32_t temp_bitcost = 0;
uint32_t temp_cost = 0;
int32_t merged = 0;
uint8_t cu_mv_cand = 0;
int8_t merge_idx = 0;
int8_t ref_list = state->frame->refmap[ref_idx].list-1;
int8_t temp_ref_idx = cur_cu->inter.mv_ref[ref_list];
// Get MV candidates
cur_cu->inter.mv_ref[ref_list] = ref_idx;
kvz_inter_get_mv_cand(state, x, y, width, height, mv_cand, cur_cu, lcu, ref_list);
cur_cu->inter.mv_ref[ref_list] = temp_ref_idx;
vector2d_t mv = { 0, 0 };
{
// Take starting point for MV search from previous frame.
// When temporal motion vector candidates are added, there is probably
// no point to this anymore, but for now it helps.
const vector2d_t tile_top_left_corner = {
(state->tile->lcu_offset_x << LOG2_LCU_WIDTH),
(state->tile->lcu_offset_y << LOG2_LCU_WIDTH)
};
const int mid_x = tile_top_left_corner.x + x + (width >> 1);
const int mid_y = tile_top_left_corner.y + y + (height >> 1);
const cu_array_t* ref_array = state->frame->ref->cu_arrays[ref_idx];
const cu_info_t* ref_cu = kvz_cu_array_at_const(ref_array, mid_x, mid_y);
if (ref_cu->type == CU_INTER) {
if (ref_cu->inter.mv_dir & 1) {
mv.x = ref_cu->inter.mv[0][0];
mv.y = ref_cu->inter.mv[0][1];
} else {
mv.x = ref_cu->inter.mv[1][0];
mv.y = ref_cu->inter.mv[1][1];
}
}
}
int search_range = 32;
switch (state->encoder_control->cfg.ime_algorithm) {
case KVZ_IME_FULL64: search_range = 64; break;
case KVZ_IME_FULL32: search_range = 32; break;
case KVZ_IME_FULL16: search_range = 16; break;
case KVZ_IME_FULL8: search_range = 8; break;
default: break;
}
switch (state->encoder_control->cfg.ime_algorithm) {
case KVZ_IME_TZ:
temp_cost += tz_search(state,
width, height,
frame->source,
ref_image,
&orig,
&mv,
mv_cand,
merge_cand,
num_cand,
ref_idx,
&temp_bitcost);
break;
case KVZ_IME_FULL64:
case KVZ_IME_FULL32:
case KVZ_IME_FULL16:
case KVZ_IME_FULL8:
case KVZ_IME_FULL:
temp_cost += search_mv_full(state,
width, height,
frame->source,
ref_image,
&orig,
&mv,
mv_cand,
merge_cand,
num_cand,
ref_idx,
search_range,
&temp_bitcost);
break;
default:
temp_cost += hexagon_search(state,
width, height,
frame->source,
ref_image,
&orig,
&mv,
mv_cand,
merge_cand,
num_cand,
ref_idx,
&temp_bitcost);
break;
}
if (state->encoder_control->cfg.fme_level > 0 && temp_cost < *inter_cost) {
temp_cost = search_frac(state,
width, height,
frame->source,
ref_image,
&orig,
&mv,
mv_cand,
merge_cand,
num_cand,
ref_idx,
&temp_bitcost);
}
merged = 0;
// Check every candidate to find a match
for(merge_idx = 0; merge_idx < num_cand; merge_idx++) {
if (merge_cand[merge_idx].dir != 3 &&
merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][0] == mv.x &&
merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][1] == mv.y &&
(uint32_t)merge_cand[merge_idx].ref[merge_cand[merge_idx].dir - 1] == ref_idx) {
merged = 1;
break;
}
}
// Only check when candidates are different
if (!merged && (mv_cand[0][0] != mv_cand[1][0] || mv_cand[0][1] != mv_cand[1][1])) {
vector2d_t mvd_temp1, mvd_temp2;
int cand1_cost,cand2_cost;
mvd_temp1.x = mv.x - mv_cand[0][0];
mvd_temp1.y = mv.y - mv_cand[0][1];
cand1_cost = get_mvd_cost(state, &mvd_temp1, &state->cabac);
mvd_temp2.x = mv.x - mv_cand[1][0];
mvd_temp2.y = mv.y - mv_cand[1][1];
cand2_cost = get_mvd_cost(state, &mvd_temp2, &state->cabac);
// Select candidate 1 if it has lower cost
if (cand2_cost < cand1_cost) {
cu_mv_cand = 1;
}
}
if (temp_cost < *inter_cost) {
// Map reference index to L0/L1 pictures
cur_cu->inter.mv_dir = ref_list+1;
uint8_t mv_ref_coded = state->frame->refmap[ref_idx].idx;
cur_cu->merged = merged;
cur_cu->merge_idx = merge_idx;
cur_cu->inter.mv_ref[ref_list] = ref_idx;
cur_cu->inter.mv[ref_list][0] = (int16_t)mv.x;
cur_cu->inter.mv[ref_list][1] = (int16_t)mv.y;
CU_SET_MV_CAND(cur_cu, ref_list, cu_mv_cand);
*inter_cost = temp_cost;
*inter_bitcost = temp_bitcost + cur_cu->inter.mv_dir - 1 + mv_ref_coded;
}
}
/**
* \brief Update PU to have best modes at this depth.
*
* \param state encoder state
* \param x_cu x-coordinate of the containing CU
* \param y_cu y-coordinate of the containing CU
* \param depth depth of the CU in the quadtree
* \param part_mode partition mode of the CU
* \param i_pu index of the PU in the CU
* \param lcu containing LCU
*
* \param inter_cost Return inter cost of the best mode
* \param inter_bitcost Return inter bitcost of the best mode
*/
static void search_pu_inter(encoder_state_t * const state,
int x_cu, int y_cu,
int depth,
part_mode_t part_mode,
int i_pu,
lcu_t *lcu,
double *inter_cost,
uint32_t *inter_bitcost)
{
*inter_cost = MAX_INT;
*inter_bitcost = MAX_INT;
const videoframe_t * const frame = state->tile->frame;
const int width_cu = LCU_WIDTH >> depth;
const int x = PU_GET_X(part_mode, width_cu, x_cu, i_pu);
const int y = PU_GET_Y(part_mode, width_cu, y_cu, i_pu);
const int width = PU_GET_W(part_mode, width_cu, i_pu);
const int height = PU_GET_H(part_mode, width_cu, i_pu);
// Merge candidate A1 may not be used for the second PU of Nx2N, nLx2N and
// nRx2N partitions.
const bool merge_a1 = i_pu == 0 || width >= height;
// Merge candidate B1 may not be used for the second PU of 2NxN, 2NxnU and
// 2NxnD partitions.
const bool merge_b1 = i_pu == 0 || width <= height;
const int x_local = SUB_SCU(x);
const int y_local = SUB_SCU(y);
cu_info_t *cur_cu = LCU_GET_CU_AT_PX(lcu, x_local, y_local);
int16_t mv_cand[2][2];
// Search for merge mode candidate
inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS];
// Get list of candidates
int16_t num_cand;
if (!state->encoder_control->cfg->tmvp_enable) {
num_cand = kvz_inter_get_merge_cand(state,
x, y,
width, height,
merge_a1, merge_b1,
merge_cand,
lcu,
0);
}
uint32_t(*get_mvd_cost)(encoder_state_t * const state, vector2d_t *, const cabac_data_t*) = get_mvd_coding_cost;
if (state->encoder_control->cfg.mv_rdo) {
get_mvd_cost = kvz_get_mvd_coding_cost_cabac;
}
// Default to candidate 0
CU_SET_MV_CAND(cur_cu, 0, 0);
CU_SET_MV_CAND(cur_cu, 1, 0);
uint32_t ref_idx;
for (ref_idx = 0; ref_idx < state->frame->ref->used_size; ref_idx++) {
if (state->encoder_control->cfg->tmvp_enable) {
// Get list of candidates, TMVP required MV scaling for each reference
num_cand = kvz_inter_get_merge_cand(state,
x, y,
width, height,
merge_a1, merge_b1,
merge_cand,
lcu,
ref_idx);
}
search_pu_inter_ref(state,
x, y,
width, height,
depth,
lcu, cur_cu,
mv_cand, merge_cand, num_cand,
ref_idx,
get_mvd_cost,
inter_cost,
inter_bitcost);
}
// Search bi-pred positions
bool can_use_bipred = state->frame->slicetype == KVZ_SLICE_B
&& state->encoder_control->cfg.bipred
&& width + height >= 16; // 4x8 and 8x4 PBs are restricted to unipred
if (can_use_bipred) {
lcu_t *templcu = MALLOC(lcu_t, 1);
unsigned cu_width = LCU_WIDTH >> depth;
static const uint8_t priorityList0[] = { 0, 1, 0, 2, 1, 2, 0, 3, 1, 3, 2, 3 };
static const uint8_t priorityList1[] = { 1, 0, 2, 0, 2, 1, 3, 0, 3, 1, 3, 2 };
const unsigned num_cand_pairs = MIN(num_cand * (num_cand - 1), 12);
kvz_mvd_cost_func *calc_mvd = calc_mvd_cost;
if (state->encoder_control->cfg.mv_rdo) {
calc_mvd = kvz_calc_mvd_cost_cabac;
}
for (int32_t idx = 0; idx < num_cand_pairs; idx++) {
uint8_t i = priorityList0[idx];
uint8_t j = priorityList1[idx];
if (i >= num_cand || j >= num_cand) break;
// Find one L0 and L1 candidate according to the priority list
if ((merge_cand[i].dir & 0x1) && (merge_cand[j].dir & 0x2)) {
if (merge_cand[i].ref[0] != merge_cand[j].ref[1] ||
merge_cand[i].mv[0][0] != merge_cand[j].mv[1][0] ||
merge_cand[i].mv[0][1] != merge_cand[j].mv[1][1]) {
uint32_t bitcost[2];
uint32_t cost = 0;
int8_t cu_mv_cand = 0;
int16_t mv[2][2];
kvz_pixel tmp_block[64 * 64];
kvz_pixel tmp_pic[64 * 64];
// Force L0 and L1 references
if (state->frame->refmap[merge_cand[i].ref[0]].list == 2 || state->frame->refmap[merge_cand[j].ref[1]].list == 1) continue;
mv[0][0] = merge_cand[i].mv[0][0];
mv[0][1] = merge_cand[i].mv[0][1];
mv[1][0] = merge_cand[j].mv[1][0];
mv[1][1] = merge_cand[j].mv[1][1];
{
// Don't try merge candidates that don't satisfy mv constraints.
vector2d_t orig = { x, y };
if (!fracmv_within_tile(state, &orig, mv[0][0], mv[0][1], width, height, -1) ||
!fracmv_within_tile(state, &orig, mv[1][0], mv[1][1], width, height, -1))
{
continue;
}
}
kvz_inter_recon_lcu_bipred(state,
state->frame->ref->images[merge_cand[i].ref[0]],
state->frame->ref->images[merge_cand[j].ref[1]],
x, y,
width,
height,
mv,
templcu);
for (int ypos = 0; ypos < height; ++ypos) {
int dst_y = ypos * width;
for (int xpos = 0; xpos < width; ++xpos) {
tmp_block[dst_y + xpos] = templcu->rec.y[
SUB_SCU(y + ypos) * LCU_WIDTH + SUB_SCU(x + xpos)];
tmp_pic[dst_y + xpos] = frame->source->y[x + xpos + (y + ypos)*frame->source->width];
}
}
cost = kvz_satd_any_size(cu_width, cu_width, tmp_pic, cu_width, tmp_block, cu_width);
cost += calc_mvd(state, merge_cand[i].mv[0][0], merge_cand[i].mv[0][1], 0, mv_cand, merge_cand, 0, ref_idx, &bitcost[0]);
cost += calc_mvd(state, merge_cand[i].mv[1][0], merge_cand[i].mv[1][1], 0, mv_cand, merge_cand, 0, ref_idx, &bitcost[1]);
if (cost < *inter_cost) {
cur_cu->inter.mv_dir = 3;
uint8_t mv_ref_coded[2] = {
state->frame->refmap[merge_cand[i].ref[0]].idx,
state->frame->refmap[merge_cand[j].ref[1]].idx
};
cur_cu->inter.mv_ref[0] = merge_cand[i].ref[0];
cur_cu->inter.mv_ref[1] = merge_cand[j].ref[1];
cur_cu->inter.mv[0][0] = merge_cand[i].mv[0][0];
cur_cu->inter.mv[0][1] = merge_cand[i].mv[0][1];
cur_cu->inter.mv[1][0] = merge_cand[j].mv[1][0];
cur_cu->inter.mv[1][1] = merge_cand[j].mv[1][1];
cur_cu->merged = 0;
// Check every candidate to find a match
for(int merge_idx = 0; merge_idx < num_cand; merge_idx++) {
if (
merge_cand[merge_idx].mv[0][0] == cur_cu->inter.mv[0][0] &&
merge_cand[merge_idx].mv[0][1] == cur_cu->inter.mv[0][1] &&
merge_cand[merge_idx].mv[1][0] == cur_cu->inter.mv[1][0] &&
merge_cand[merge_idx].mv[1][1] == cur_cu->inter.mv[1][1] &&
merge_cand[merge_idx].ref[0] == cur_cu->inter.mv_ref[0] &&
merge_cand[merge_idx].ref[1] == cur_cu->inter.mv_ref[1]) {
cur_cu->merged = 1;
cur_cu->merge_idx = merge_idx;
break;
}
}
// Each motion vector has its own candidate
for (int reflist = 0; reflist < 2; reflist++) {
cu_mv_cand = 0;
kvz_inter_get_mv_cand(state, x, y, width, height, mv_cand, cur_cu, lcu, reflist);
if ((mv_cand[0][0] != mv_cand[1][0] || mv_cand[0][1] != mv_cand[1][1])) {
vector2d_t mvd_temp1, mvd_temp2;
int cand1_cost, cand2_cost;
mvd_temp1.x = cur_cu->inter.mv[reflist][0] - mv_cand[0][0];
mvd_temp1.y = cur_cu->inter.mv[reflist][1] - mv_cand[0][1];
cand1_cost = get_mvd_cost(state, &mvd_temp1, (cabac_data_t*)&state->cabac);
mvd_temp2.x = cur_cu->inter.mv[reflist][0] - mv_cand[1][0];
mvd_temp2.y = cur_cu->inter.mv[reflist][1] - mv_cand[1][1];
cand2_cost = get_mvd_cost(state, &mvd_temp2, (cabac_data_t*)&state->cabac);
// Select candidate 1 if it has lower cost
if (cand2_cost < cand1_cost) {
cu_mv_cand = 1;
}
}
CU_SET_MV_CAND(cur_cu, reflist, cu_mv_cand);
}
*inter_cost = cost;
*inter_bitcost = bitcost[0] + bitcost[1] + cur_cu->inter.mv_dir - 1 + mv_ref_coded[0] + mv_ref_coded[1];
}
}
}
}
FREE_POINTER(templcu);
}
if (*inter_cost < INT_MAX) {
const vector2d_t orig = { x, y };
if (cur_cu->inter.mv_dir == 1) {
assert(fracmv_within_tile(state, &orig, cur_cu->inter.mv[0][0], cur_cu->inter.mv[0][1], width, height, -1));
}
}
}
/**
* \brief Update CU to have best modes at this depth.
*
* Only searches the 2Nx2N partition mode.
*
* \param state encoder state
* \param x x-coordinate of the CU
* \param y y-coordinate of the CU
* \param depth depth of the CU in the quadtree
* \param lcu containing LCU
*
* \param inter_cost Return inter cost
* \param inter_bitcost Return inter bitcost
*/
void kvz_search_cu_inter(encoder_state_t * const state,
int x, int y, int depth,
lcu_t *lcu,
double *inter_cost,
uint32_t *inter_bitcost)
{
search_pu_inter(state,
x, y, depth,
SIZE_2Nx2N, 0,
lcu,
inter_cost,
inter_bitcost);
}
/**
* \brief Update CU to have best modes at this depth.
*
* Only searches the given partition mode.
*
* \param state encoder state
* \param x x-coordinate of the CU
* \param y y-coordinate of the CU
* \param depth depth of the CU in the quadtree
* \param part_mode partition mode to search
* \param lcu containing LCU
*
* \param inter_cost Return inter cost
* \param inter_bitcost Return inter bitcost
*/
void kvz_search_cu_smp(encoder_state_t * const state,
int x, int y,
int depth,
part_mode_t part_mode,
lcu_t *lcu,
double *inter_cost,
uint32_t *inter_bitcost)
{
const int num_pu = kvz_part_mode_num_parts[part_mode];
const int width = LCU_WIDTH >> depth;
const int y_local = SUB_SCU(y);
const int x_local = SUB_SCU(x);
*inter_cost = 0;
*inter_bitcost = 0;
for (int i = 0; i < num_pu; ++i) {
const int x_pu = PU_GET_X(part_mode, width, x_local, i);
const int y_pu = PU_GET_Y(part_mode, width, y_local, i);
const int width_pu = PU_GET_W(part_mode, width, i);
const int height_pu = PU_GET_H(part_mode, width, i);
cu_info_t *cur_pu = LCU_GET_CU_AT_PX(lcu, x_pu, y_pu);
cur_pu->type = CU_INTER;
cur_pu->part_size = part_mode;
cur_pu->depth = depth;
double cost = MAX_INT;
uint32_t bitcost = MAX_INT;
search_pu_inter(state, x, y, depth, part_mode, i, lcu, &cost, &bitcost);
*inter_cost += cost;
*inter_bitcost += bitcost;
for (int y = y_pu; y < y_pu + height_pu; y += SCU_WIDTH) {
for (int x = x_pu; x < x_pu + width_pu; x += SCU_WIDTH) {
cu_info_t *scu = LCU_GET_CU_AT_PX(lcu, x, y);
scu->type = CU_INTER;
scu->inter = cur_pu->inter;
}
}
}
}