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[lfnst] [dual-tree] LFNST should work with dual tree

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This commit is contained in:
Joose Sainio 2022-06-23 14:58:40 +03:00
parent 6c7dc9004c
commit 37590add20
6 changed files with 48 additions and 44 deletions
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44
src/encode_coding_tree.c
View file

@ -139,9 +139,9 @@ static int get_isp_split_dim(const int width, const int height, const int isp_sp
return partition_size;
}
static bool can_use_lfnst_with_isp(const int width, const int height, const int isp_split_type, const int color)
static bool can_use_lfnst_with_isp(const int width, const int height, const int isp_split_type, const enum uvg_tree_type tree_type)
{
if (color != COLOR_Y) {
if (tree_type == UVG_CHROMA_T) {
return false;
}
if (isp_split_type == NOT_INTRA_SUBPARTITIONS) {
@ -161,11 +161,11 @@ static bool can_use_lfnst_with_isp(const int width, const int height, const int
bool uvg_is_lfnst_allowed(
const encoder_state_t* const state,
const cu_info_t* const pred_cu,
const int color,
const int width,
const int height,
const int x,
const int y)
const int y,
enum uvg_tree_type tree_type)
{
if (state->encoder_control->cfg.lfnst && pred_cu->type == CU_INTRA) {
const int isp_mode = 0; // ISP_TODO: assign proper ISP mode when ISP is implemented
@ -173,21 +173,20 @@ static bool can_use_lfnst_with_isp(const int width, const int height, const int
const int depth = pred_cu->depth;
const int chroma_width = width >> 1;
const int chroma_height = height >> 1;
const int cu_width = color == COLOR_Y || depth == 4 ? width : chroma_width;
const int cu_height = color == COLOR_Y || depth == 4 ? height : chroma_height;
const int cu_width = tree_type != UVG_LUMA_T || depth == 4 ? width : chroma_width;
const int cu_height = tree_type != UVG_LUMA_T || depth == 4 ? height : chroma_height;
bool can_use_lfnst_with_mip = (width >= 16 && height >= 16);
bool is_sep_tree = depth == 4; // TODO: if/when separate tree structure is implemented, add proper boolean here
bool is_sep_tree = depth == 4 || tree_type != UVG_BOTH_T;
bool mip_flag = pred_cu->type == CU_INTRA ? pred_cu->intra.mip_flag : false;
if ((isp_mode && !can_use_lfnst_with_isp(width, height, isp_split_type, color)) ||
if ((isp_mode && !can_use_lfnst_with_isp(width, height, isp_split_type, tree_type)) ||
(pred_cu->type == CU_INTRA && mip_flag && !can_use_lfnst_with_mip) ||
(is_sep_tree && color != COLOR_Y && MIN(cu_width, cu_height) < 4) ||
(is_sep_tree && MIN(cu_width, cu_height) < 4) ||
(cu_width > TR_MAX_WIDTH || cu_height > TR_MAX_WIDTH)) {
return false;
}
bool is_separate_tree = depth == 4; // TODO: if/when separate/dual tree structure is implemented, get proper value for this
bool luma_flag = is_separate_tree ? (color == COLOR_Y ? true : false) : true;
bool chroma_flag = is_separate_tree ? (color != COLOR_Y ? true : false) : true;
bool luma_flag = (depth == 4 && tree_type == UVG_BOTH_T) || tree_type == UVG_LUMA_T;
bool chroma_flag = (depth == 4 && tree_type == UVG_BOTH_T) || tree_type == UVG_CHROMA_T;
bool non_zero_coeff_non_ts_corner_8x8 = (luma_flag && pred_cu->violates_lfnst_constrained_luma) || (chroma_flag && pred_cu->violates_lfnst_constrained_chroma);
bool is_tr_skip = false;
@ -201,7 +200,7 @@ static bool can_use_lfnst_with_isp(const int width, const int height, const int
const int tu_height = tu_width; // TODO: height for non-square blocks
// TODO: chroma transform skip
if (color == COLOR_Y) {
if (tree_type != UVG_BOTH_T) {
for (int i = 0; i < num_transform_units; i++) {
// TODO: this works only for square blocks
const int pu_x = x + ((i % tu_row_length) * tu_width);
@ -233,17 +232,17 @@ static bool encode_lfnst_idx(
const int x,
const int y,
const int depth,
const int color,
const int width,
const int height)
const int height,
enum uvg_tree_type tree_type)
{
if (uvg_is_lfnst_allowed(state, pred_cu, color, width, height, x, y)) {
if (uvg_is_lfnst_allowed(state, pred_cu, width, height, x, y, tree_type)) {
// Getting separate tree bool from block size is a temporary fix until a proper dual tree check is possible (there is no dual tree structure at time of writing this).
// VTM seems to force explicit dual tree structure for small 4x4 blocks
bool is_separate_tree = depth == 4; // TODO: if/when separate/dual tree structure is implemented, get proper value for this
bool is_separate_tree = depth == 4 || tree_type != UVG_BOTH_T;
const int lfnst_index = color == COLOR_Y ? pred_cu->lfnst_idx : pred_cu->cr_lfnst_idx;
const int lfnst_index = tree_type != UVG_CHROMA_T ? pred_cu->lfnst_idx : pred_cu->cr_lfnst_idx;
assert((lfnst_index >= 0 && lfnst_index < 3) && "Invalid LFNST index.");
uint16_t ctx_idx = 0;
@ -1718,8 +1717,7 @@ void uvg_encode_coding_tree(
encode_transform_coeff(state, x, y, depth, 0, 0, 0, 0, coeff, tree_type);
}
bool lfnst_written = encode_lfnst_idx(state, cabac, cur_cu, x, y, depth, COLOR_Y, cu_width, cu_height);
bool is_separate_tree = depth == 4; // TODO: proper value for dual tree when dual tree structure is implemented
bool lfnst_written = encode_lfnst_idx(state, cabac, cur_cu, x, y, depth, cu_width, cu_height, tree_type);
encode_mts_idx(state, cabac, cur_cu);
@ -1729,14 +1727,14 @@ void uvg_encode_coding_tree(
tree_type != UVG_LUMA_T) {
encode_chroma_intra_cu(cabac, cur_cu, state->encoder_control->cfg.cclm, NULL);
// LFNST constraints must be reset here. Otherwise the left over values will interfere when calculating new constraints
cu_info_t* tmp = uvg_cu_array_at(frame->cu_array, x, y);
cu_info_t* tmp = uvg_cu_array_at((cu_array_t*)used_array, x, y);
tmp->violates_lfnst_constrained_luma = false;
tmp->violates_lfnst_constrained_chroma = false;
tmp->lfnst_last_scan_pos = false;
encode_transform_coeff(state, x, y, depth, 0, 0, 0, 1, coeff, tree_type);
// Write LFNST only once for single tree structure
if (!lfnst_written || is_separate_tree) {
encode_lfnst_idx(state, cabac, tmp, x, y, depth, COLOR_UV, cu_width, cu_height);
if (!lfnst_written || tree_type == UVG_CHROMA_T) {
encode_lfnst_idx(state, cabac, tmp, x, y, depth, cu_width, cu_height, tree_type);
}
}
}

4
src/encode_coding_tree.h
View file

@ -44,11 +44,11 @@ bool uvg_is_mts_allowed(const encoder_state_t* const state, cu_info_t* const pre
bool uvg_is_lfnst_allowed(
const encoder_state_t* const state,
const cu_info_t* const pred_cu,
const int color,
const int width,
const int height,
const int x,
const int y);
const int y,
enum uvg_tree_type tree_type);
void uvg_encode_coding_tree(
encoder_state_t * const state,

15
src/search.c
View file

@ -566,12 +566,12 @@ static double cu_rd_cost_tr_split_accurate(
coeff_bits += uvg_get_coeff_cost(state, coeffs, tr_cu, width, 0, luma_scan_mode, tr_cu->tr_skip & 1);
}
if(depth == 4) {
if (uvg_is_lfnst_allowed(state, tr_cu, COLOR_Y, width, width, x_px, y_px)) {
if(depth == 4 || tree_type == UVG_LUMA_T) {
if (uvg_is_lfnst_allowed(state, tr_cu, width, width, x_px, y_px, tree_type)) {
const int lfnst_idx = tr_cu->lfnst_idx;
CABAC_FBITS_UPDATE(
cabac,
&cabac->ctx.lfnst_idx_model[tr_cu->depth == 4],
&cabac->ctx.lfnst_idx_model[1],
lfnst_idx != 0,
tr_tree_bits,
"lfnst_idx");
@ -634,11 +634,11 @@ static double cu_rd_cost_tr_split_accurate(
}
}
if (uvg_is_lfnst_allowed(state, tr_cu, depth == 4 ? COLOR_UV : COLOR_Y, width, width, x_px, y_px)) {
const int lfnst_idx = depth != 4 ? tr_cu->lfnst_idx : tr_cu->cr_lfnst_idx;
if (uvg_is_lfnst_allowed(state, tr_cu, width, width, x_px, y_px, tree_type)) {
const int lfnst_idx = depth != 4 || tree_type != UVG_CHROMA_T ? tr_cu->lfnst_idx : tr_cu->cr_lfnst_idx;
CABAC_FBITS_UPDATE(
cabac,
&cabac->ctx.lfnst_idx_model[tr_cu->depth == 4],
&cabac->ctx.lfnst_idx_model[tr_cu->depth == 4 || tree_type != UVG_BOTH_T],
lfnst_idx != 0,
tr_tree_bits,
"lfnst_idx");
@ -913,7 +913,8 @@ static double search_cu(
if(tree_type != UVG_CHROMA_T) {
intra_search.pred_cu.joint_cb_cr = 4;
uvg_search_cu_intra(state, x, y, depth, &intra_search,
lcu);
lcu,
tree_type);
}
#ifdef COMPLETE_PRED_MODE_BITS
// Technically counting these bits would be correct, however counting

24
src/search_intra.c
View file

@ -268,7 +268,8 @@ static double search_intra_trdepth(
int max_depth,
double cost_treshold,
intra_search_data_t *const search_data,
lcu_t *const lcu)
lcu_t *const lcu,
enum uvg_tree_type tree_type)
{
assert(depth >= 0 && depth <= MAX_PU_DEPTH);
@ -422,7 +423,7 @@ static double search_intra_trdepth(
double transform_bits = 0;
if(state->encoder_control->cfg.lfnst && depth == pred_cu->tr_depth) {
if(!constraints[0] && constraints[1]) {
transform_bits += CTX_ENTROPY_FBITS(&state->search_cabac.ctx.lfnst_idx_model[tr_cu->depth == 4], lfnst_idx != 0);
transform_bits += CTX_ENTROPY_FBITS(&state->search_cabac.ctx.lfnst_idx_model[tr_cu->depth == 4 || tree_type == UVG_LUMA_T], lfnst_idx != 0);
if(lfnst_idx > 0) {
transform_bits += CTX_ENTROPY_FBITS(&state->search_cabac.ctx.lfnst_idx_model[2], lfnst_idx == 2);
}
@ -581,15 +582,15 @@ static double search_intra_trdepth(
if (depth < max_depth && depth < MAX_PU_DEPTH) {
split_cost = 0;
split_cost += search_intra_trdepth(state, x_px, y_px, depth + 1, max_depth, nosplit_cost, search_data, lcu);
split_cost += search_intra_trdepth(state, x_px, y_px, depth + 1, max_depth, nosplit_cost, search_data, lcu, tree_type);
if (split_cost < nosplit_cost) {
split_cost += search_intra_trdepth(state, x_px + offset, y_px, depth + 1, max_depth, nosplit_cost, search_data, lcu);
split_cost += search_intra_trdepth(state, x_px + offset, y_px, depth + 1, max_depth, nosplit_cost, search_data, lcu, tree_type);
}
if (split_cost < nosplit_cost) {
split_cost += search_intra_trdepth(state, x_px, y_px + offset, depth + 1, max_depth, nosplit_cost, search_data, lcu);
split_cost += search_intra_trdepth(state, x_px, y_px + offset, depth + 1, max_depth, nosplit_cost, search_data, lcu, tree_type);
}
if (split_cost < nosplit_cost) {
split_cost += search_intra_trdepth(state, x_px + offset, y_px + offset, depth + 1, max_depth, nosplit_cost, search_data, lcu);
split_cost += search_intra_trdepth(state, x_px + offset, y_px + offset, depth + 1, max_depth, nosplit_cost, search_data, lcu, tree_type);
}
double cbf_bits = 0.0;
@ -1329,7 +1330,8 @@ static int8_t search_intra_rdo(
int depth,
int modes_to_check,
intra_search_data_t *search_data,
lcu_t *lcu)
lcu_t *lcu,
enum uvg_tree_type tree_type)
{
const int tr_depth = CLIP(1, MAX_PU_DEPTH, depth + state->encoder_control->cfg.tr_depth_intra);
@ -1339,7 +1341,7 @@ static int8_t search_intra_rdo(
search_data[mode].bits = rdo_bitcost;
search_data[mode].cost = rdo_bitcost * state->lambda;
double mode_cost = search_intra_trdepth(state, x_px, y_px, depth, tr_depth, MAX_INT, &search_data[mode], lcu);
double mode_cost = search_intra_trdepth(state, x_px, y_px, depth, tr_depth, MAX_INT, &search_data[mode], lcu, tree_type);
search_data[mode].cost += mode_cost;
if (state->encoder_control->cfg.intra_rdo_et && !cbf_is_set_any(search_data[mode].pred_cu.cbf, depth)) {
modes_to_check = mode + 1;
@ -1761,7 +1763,8 @@ void uvg_search_cu_intra(
const int y_px,
const int depth,
intra_search_data_t* mode_out,
lcu_t *lcu)
lcu_t *lcu,
enum uvg_tree_type tree_type)
{
const vector2d_t lcu_px = { SUB_SCU(x_px), SUB_SCU(y_px) };
const int8_t cu_width = LCU_WIDTH >> depth;
@ -1973,7 +1976,8 @@ void uvg_search_cu_intra(
depth,
number_of_modes_to_search,
search_data,
lcu);
lcu,
tree_type);
search_data[0].pred_cu.mts_last_scan_pos = false;
search_data[0].pred_cu.violates_mts_coeff_constraint = false;
}

3
src/search_intra.h
View file

@ -63,6 +63,7 @@ void uvg_search_cu_intra(
const int y_px,
const int depth,
intra_search_data_t* search_data,
lcu_t *lcu);
lcu_t *lcu,
enum uvg_tree_type tree_type);
#endif // SEARCH_INTRA_H_

2
src/transform.c
View file

@ -700,7 +700,7 @@ void uvg_chroma_transform_search(
transforms[i] == CHROMA_TS);
}
if(depth == 4 && state->encoder_control->cfg.lfnst && 0) {
if(uvg_is_lfnst_allowed(state, pred_cu, COLOR_UV, width, height, 0 ,0)) {
if(uvg_is_lfnst_allowed(state, pred_cu, width, height, 0, 0 , UVG_CHROMA_T)) {
const int lfnst_idx = pred_cu->cr_lfnst_idx;
CABAC_FBITS_UPDATE(
&state->search_cabac,