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[mtt] remove lfnst dependency to depth

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This commit is contained in:
Joose Sainio 2022-09-13 14:38:19 +03:00 committed by Marko Viitanen
parent 790b1fad48
commit 0b6f666a1b
6 changed files with 44 additions and 155 deletions
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1
src/cu.h
View file

@ -598,5 +598,6 @@ static INLINE void cbf_copy(uint16_t *cbf, uint16_t src, color_t plane)
}
#define GET_SPLITDATA(CU,curDepth) (((CU)->split_tree >> (curDepth)) & 7)
#define PU_IS_TU(cu) ((cu)->log2_width <= TR_MAX_LOG2_SIZE && (cu)->log2_height <= TR_MAX_LOG2_SIZE)
#endif

92
src/encode_coding_tree.c
View file

@ -109,87 +109,33 @@ static void encode_mts_idx(
bool uvg_is_lfnst_allowed(
const encoder_state_t* const state,
const cu_info_t* const pred_cu,
const int width,
const int height,
const int x,
const int y,
enum uvg_tree_type tree_type,
const color_t color,
const lcu_t* lcu)
const cu_loc_t* const cu_loc)
{
if (state->encoder_control->cfg.lfnst && pred_cu->type == CU_INTRA && pred_cu->depth == pred_cu->tr_depth) {
if (state->encoder_control->cfg.lfnst && pred_cu->type == CU_INTRA && PU_IS_TU(pred_cu)) {
const int isp_mode = pred_cu->intra.isp_mode;
const int depth = pred_cu->depth;
const int chroma_width = width >> 1;
const int chroma_height = height >> 1;
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 || tree_type != UVG_BOTH_T;
const int cu_width = tree_type != UVG_CHROMA_T ? cu_loc->width : cu_loc->chroma_width;
const int cu_height = tree_type != UVG_CHROMA_T ? cu_loc->height : cu_loc->chroma_height;
bool can_use_lfnst_with_mip = (cu_width >= 16 && cu_height >= 16);
bool is_sep_tree = tree_type != UVG_BOTH_T;
bool mip_flag = pred_cu->type == CU_INTRA && color == COLOR_Y ? pred_cu->intra.mip_flag : false;
if ((isp_mode && !uvg_can_use_isp_with_lfnst(width, height, isp_mode, tree_type)) ||
if ((isp_mode && !uvg_can_use_isp_with_lfnst(cu_width, cu_height, isp_mode, tree_type)) ||
(pred_cu->type == CU_INTRA && mip_flag && !can_use_lfnst_with_mip) ||
(is_sep_tree && MIN(cu_width, cu_height) < 4) ||
(cu_width > TR_MAX_WIDTH || cu_height > TR_MAX_WIDTH)) {
return false;
}
bool luma_flag = (depth == 4 && color == COLOR_Y) || (tree_type != UVG_CHROMA_T && depth != 4);
bool chroma_flag = (depth == 4 && color != COLOR_Y) || tree_type != UVG_LUMA_T;
bool luma_flag = tree_type != UVG_CHROMA_T;
bool chroma_flag = tree_type != UVG_LUMA_T;
bool non_zero_coeff_non_ts_corner_8x8 = false;
bool last_scan_pos = false;
bool is_tr_skip = false;
int split_num = color == COLOR_Y && isp_mode ? uvg_get_isp_split_num(width, height, isp_mode, false) : 0;
const videoframe_t* const frame = state->tile->frame;
if (split_num) {
// Constraints for ISP split blocks
for (int i = 0; i < split_num; ++i) {
cu_loc_t split_loc;
uvg_get_isp_split_loc(&split_loc, x, y, width, height, i, isp_mode, false);
int local_split_x = split_loc.x;
int local_split_y = split_loc.y;
uvg_get_isp_cu_arr_coords(&local_split_x, &local_split_y);
const cu_info_t* split_cu = lcu ? LCU_GET_CU_AT_PX(lcu, local_split_x, local_split_y) :
uvg_cu_array_at_const(frame->cu_array, local_split_x, local_split_y);
//if (cbf_is_set(split_cu->cbf, depth, COLOR_Y)) {
// ISP_TODO: remove this if clause altogether if it seems it is not needed
if (true) {
non_zero_coeff_non_ts_corner_8x8 |= (luma_flag && split_cu->violates_lfnst_constrained_luma) || (chroma_flag && split_cu->violates_lfnst_constrained_chroma);
//last_scan_pos |= split_cu->lfnst_last_scan_pos;
last_scan_pos |= true;
}
}
} else {
non_zero_coeff_non_ts_corner_8x8 |= (luma_flag && pred_cu->violates_lfnst_constrained_luma) || (chroma_flag && pred_cu->violates_lfnst_constrained_chroma);
last_scan_pos |= pred_cu->lfnst_last_scan_pos;
}
//const int num_pred_units = kvz_part_mode_num_parts[pred_cu->part_size];
const int tr_depth = pred_cu->tr_depth;
assert(depth <= tr_depth && "Depth greater than transform depth. This should never trigger.");
const int num_transform_units = 1 << (2 * (tr_depth - depth));
const int tu_row_length = 1 << (tr_depth - depth);
const int tu_width = cu_width >> (tr_depth - depth);
const int tu_height = tu_width; // TODO: height for non-square blocks
// TODO: chroma transform skip
if (color == COLOR_Y) {
for (int i = 0; i < num_transform_units; i++) {
// TODO: this works only for square blocks
const int tu_x = x + ((i % tu_row_length) * tu_width);
const int tu_y = y + ((i / tu_row_length) * tu_height);
const cu_info_t* cur_tu = lcu ? LCU_GET_CU_AT_PX(lcu, tu_x, tu_y) : uvg_cu_array_at_const(frame->cu_array, tu_x, tu_y);
assert(cur_tu != NULL && "NULL transform unit.");
bool cbf_set = cbf_is_set(cur_tu->cbf, tr_depth, COLOR_Y);
if (cur_tu != NULL && cbf_set && cur_tu->tr_idx == MTS_SKIP) {
if (color == COLOR_Y && pred_cu->tr_idx == MTS_SKIP) {
is_tr_skip = true;
}
}
}
if ((!pred_cu->lfnst_last_scan_pos && !isp_mode) || non_zero_coeff_non_ts_corner_8x8 || is_tr_skip) {
return false;
@ -205,19 +151,15 @@ static bool encode_lfnst_idx(
const encoder_state_t* const state,
cabac_data_t * const cabac,
const cu_info_t * const pred_cu,
const int x,
const int y,
const int depth,
const int width,
const int height,
enum uvg_tree_type tree_type,
const color_t color)
const color_t color,
const cu_loc_t* const cu_loc)
{
if (uvg_is_lfnst_allowed(state, pred_cu, width, height, x, y, tree_type, color, NULL)) {
if (uvg_is_lfnst_allowed(state, pred_cu, tree_type, color, cu_loc)) {
// 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 || tree_type != UVG_BOTH_T;
bool is_separate_tree = tree_type != UVG_BOTH_T;
const int lfnst_index = !is_separate_tree || color == COLOR_Y ? pred_cu->lfnst_idx : pred_cu->cr_lfnst_idx;
assert((lfnst_index >= 0 && lfnst_index < 3) && "Invalid LFNST index.");
@ -1692,6 +1634,8 @@ void uvg_encode_coding_tree(
uvg_encode_intra_luma_coding_unit(state, cabac, cur_cu, cu_loc, NULL, NULL);
}
const bool is_local_dual_tree = cu_height * cu_width < 64 && tree_type == UVG_BOTH_T;
// Code chroma prediction mode.
if (state->encoder_control->chroma_format != UVG_CSP_400 && depth != 4 && tree_type == UVG_BOTH_T) {
encode_chroma_intra_cu(cabac, cur_cu, state->encoder_control->cfg.cclm, NULL);
@ -1719,7 +1663,7 @@ void uvg_encode_coding_tree(
}
if (tree_type != UVG_CHROMA_T) {
bool lfnst_written = encode_lfnst_idx(state, cabac, cur_cu, x, y, depth, cu_width, cu_height, tree_type, COLOR_Y);
bool lfnst_written = encode_lfnst_idx(state, cabac, cur_cu, is_local_dual_tree ? UVG_LUMA_T : tree_type, COLOR_Y, cu_loc);
}
encode_mts_idx(state, cabac, cur_cu, cu_loc);
@ -1735,7 +1679,7 @@ void uvg_encode_coding_tree(
tmp->lfnst_last_scan_pos = false;
encode_transform_coeff(state, &cu_loc, depth, 0, 1, coeff, tree_type, true, false, &luma_cbf_ctx, cu_loc);
// Write LFNST only once for single tree structure
encode_lfnst_idx(state, cabac, tmp, x, y, depth, cu_width, cu_height, tree_type, COLOR_UV);
encode_lfnst_idx(state, cabac, tmp, is_local_dual_tree ? UVG_CHROMA_T : tree_type, COLOR_UV, cu_loc);
}
}

6
src/encode_coding_tree.h
View file

@ -45,13 +45,9 @@ 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 width,
const int height,
const int x,
const int y,
enum uvg_tree_type tree_type,
const color_t color,
const lcu_t* lcu);
const cu_loc_t* const cu_loc);
void uvg_encode_coding_tree(
encoder_state_t * const state,

16
src/search.c
View file

@ -674,8 +674,11 @@ static double cu_rd_cost_tr_split_accurate(
}
}
if(cu_loc->width == 4 || tree_type == UVG_LUMA_T) {
if (uvg_is_lfnst_allowed(state, tr_cu, width, height, cu_loc->local_x, cu_loc->local_y, tree_type, COLOR_Y, lcu)) {
const bool is_local_sep_tree = pred_cu->log2_width + pred_cu->log2_height < 6 && tree_type == UVG_BOTH_T;
if(is_local_sep_tree || tree_type == UVG_LUMA_T) {
if (uvg_is_lfnst_allowed(state, tr_cu, is_local_sep_tree ? UVG_LUMA_T : tree_type, COLOR_Y, cu_loc)) {
const int lfnst_idx = tr_cu->lfnst_idx;
CABAC_FBITS_UPDATE(
cabac,
@ -747,11 +750,12 @@ static double cu_rd_cost_tr_split_accurate(
}
}
if (uvg_is_lfnst_allowed(state, tr_cu, width, height, cu_loc->local_x, cu_loc->local_y, tree_type, cu_loc->width == 4 || tree_type == UVG_CHROMA_T ? COLOR_UV : COLOR_Y, lcu)) {
const int lfnst_idx = (cu_loc->width != 4 && tree_type != UVG_CHROMA_T) ? tr_cu->lfnst_idx : tr_cu->cr_lfnst_idx;
const bool is_chroma_tree = is_local_sep_tree || tree_type == UVG_CHROMA_T;
if (uvg_is_lfnst_allowed(state, tr_cu, is_local_sep_tree ? UVG_CHROMA_T : tree_type, is_chroma_tree ? COLOR_UV : COLOR_Y, cu_loc)) {
const int lfnst_idx = is_chroma_tree ? tr_cu->cr_lfnst_idx : tr_cu->lfnst_idx;
CABAC_FBITS_UPDATE(
cabac,
&cabac->ctx.lfnst_idx_model[tr_cu->depth == 4 || tree_type != UVG_BOTH_T],
&cabac->ctx.lfnst_idx_model[is_chroma_tree],
lfnst_idx != 0,
tr_tree_bits,
"lfnst_idx");
@ -975,6 +979,8 @@ static double search_cu(
cur_cu->lfnst_idx = 0;
cur_cu->joint_cb_cr = 0;
cur_cu->split_tree = split_tree.split_tree;
cur_cu->log2_width = uvg_g_convert_to_log2[cu_width];
cur_cu->log2_height = uvg_g_convert_to_log2[cu_height];
// If the CU is completely inside the frame at this depth, search for
// prediction modes at this depth.

78
src/search_intra.c
View file

@ -300,7 +300,7 @@ static double search_intra_trdepth(
pred_cu->tr_depth = depth;
const bool mts_enabled = (state->encoder_control->cfg.mts == UVG_MTS_INTRA || state->encoder_control->cfg.mts == UVG_MTS_BOTH)
&& tr_cu->depth == tr_cu->tr_depth;
&& PU_IS_TU(pred_cu);
nosplit_cost = 0.0;
@ -330,10 +330,10 @@ static double search_intra_trdepth(
num_transforms = pred_cu->intra.isp_mode == ISP_MODE_NO_ISP ? num_transforms : 1;
}
const int mts_start = trafo;
//TODO: height
if (state->encoder_control->cfg.trskip_enable &&
width <= (1 << state->encoder_control->cfg.trskip_max_size) /*&& height == 4*/ &&
pred_cu->intra.isp_mode == ISP_MODE_NO_ISP) { // tr_skip cannot be used wit ISP
if (state->encoder_control->cfg.trskip_enable
&& width <= (1 << state->encoder_control->cfg.trskip_max_size)
&& height <= (1 << state->encoder_control->cfg.trskip_max_size)
&& pred_cu->intra.isp_mode == ISP_MODE_NO_ISP) {
num_transforms = MAX(num_transforms, 2);
}
pred_cu->intra.mode_chroma = -1;
@ -346,9 +346,10 @@ static double search_intra_trdepth(
max_lfnst_idx = 0;
}
const bool is_local_dual_tree = pred_cu->log2_width + pred_cu->log2_height < 6 && tree_type == UVG_BOTH_T;
int start_idx = 0;
int end_idx = state->encoder_control->cfg.lfnst &&
depth == pred_cu->tr_depth &&
int end_idx = state->encoder_control->cfg.lfnst && PU_IS_TU(pred_cu) &&
uvg_can_use_isp_with_lfnst(width, height, pred_cu->intra.isp_mode, tree_type) ? max_lfnst_idx : 0;
for (int i = start_idx; i < end_idx + 1; ++i) {
search_data->lfnst_costs[i] = MAX_DOUBLE;
@ -436,11 +437,11 @@ static double search_intra_trdepth(
lcu,
search_data->best_isp_cbfs);
double transform_bits = 0;
if (state->encoder_control->cfg.lfnst && depth == pred_cu->tr_depth &&
if (state->encoder_control->cfg.lfnst && PU_IS_TU(pred_cu) &&
trafo != MTS_SKIP) {
if (!constraints[0] && constraints[1]) {
transform_bits += CTX_ENTROPY_FBITS(
&state->search_cabac.ctx.lfnst_idx_model[tr_cu->depth == 4 ||
&state->search_cabac.ctx.lfnst_idx_model[is_local_dual_tree ||
tree_type == UVG_LUMA_T],
lfnst_idx != 0);
if (lfnst_idx > 0) {
@ -566,30 +567,6 @@ static double search_intra_trdepth(
}
nosplit_cbf = pred_cu->cbf;
uvg_pixels_blit(
lcu->rec.y,
nosplit_pixels.y,
width,
width,
LCU_WIDTH,
width);
if (reconstruct_chroma) {
uvg_pixels_blit(
lcu->rec.u,
nosplit_pixels.u,
width_c,
width_c,
LCU_WIDTH_C,
width_c);
uvg_pixels_blit(
lcu->rec.v,
nosplit_pixels.v,
width_c,
width_c,
LCU_WIDTH_C,
width_c);
}
}
@ -620,30 +597,6 @@ static double search_intra_trdepth(
split_cost += search_intra_trdepth(state, &split_cu_loc, max_depth, nosplit_cost, search_data, lcu, tree_type);
}
double cbf_bits = 0.0;
// Add cost of cbf chroma bits on transform tree.
// All cbf bits are accumulated to pred_cu.cbf and cbf_is_set returns true
// if cbf is set at any level >= depth, so cbf chroma is assumed to be 0
// if this and any previous transform block has no chroma coefficients.
// When searching the first block we don't actually know the real values,
// so this will code cbf as 0 and not code the cbf at all for descendants.
if (state->encoder_control->chroma_format != UVG_CSP_400) {
const uint8_t tr_depth = depth - pred_cu->depth;
cabac_data_t* cabac = (cabac_data_t *)&state->search_cabac;
cabac_ctx_t* ctx = &(cabac->ctx.qt_cbf_model_cb[0]);
if (tr_depth == 0 || cbf_is_set(pred_cu->cbf, depth - 1, COLOR_U)) {
CABAC_FBITS_UPDATE(cabac, ctx, cbf_is_set(pred_cu->cbf, depth, COLOR_U), cbf_bits, "cbf_cb");
}
ctx = &(state->cabac.ctx.qt_cbf_model_cr[cbf_is_set(pred_cu->cbf, depth, COLOR_U)]);
if (tr_depth == 0 || cbf_is_set(pred_cu->cbf, depth - 1, COLOR_V)) {
CABAC_FBITS_UPDATE(cabac, ctx, cbf_is_set(pred_cu->cbf, depth, COLOR_V), cbf_bits, "cbf_cr");
}
}
double bits = cbf_bits;
split_cost += bits * state->lambda;
} else {
assert(width <= TR_MAX_WIDTH);
}
@ -652,17 +605,6 @@ static double search_intra_trdepth(
return split_cost;
} else {
uvg_lcu_fill_trdepth(lcu, cu_loc, depth, tree_type);
pred_cu->cbf = nosplit_cbf;
// We only restore the pixel data and not coefficients or cbf data.
// The only thing we really need are the border pixels.uvg_intra_get_dir_luma_predictor
uvg_pixels_blit(nosplit_pixels.y, lcu->rec.y, width, width, width, LCU_WIDTH);
if (reconstruct_chroma) {
uvg_pixels_blit(nosplit_pixels.u, lcu->rec.u, width_c, width_c, width_c, LCU_WIDTH_C);
uvg_pixels_blit(nosplit_pixels.v, lcu->rec.v, width_c, width_c, width_c, LCU_WIDTH_C);
}
return nosplit_cost;
}
}

2
src/transform.c
View file

@ -723,7 +723,7 @@ void uvg_chroma_transform_search(
COEFF_ORDER_LINEAR);
}
if((depth == 4 || tree_type == UVG_CHROMA_T) && state->encoder_control->cfg.lfnst && 0) {
if(uvg_is_lfnst_allowed(state, pred_cu, width, height, 0, 0 , UVG_CHROMA_T, COLOR_UV, lcu)) {
if(uvg_is_lfnst_allowed(state, pred_cu, UVG_CHROMA_T, COLOR_UV, cu_loc)) {
const int lfnst_idx = pred_cu->cr_lfnst_idx;
CABAC_FBITS_UPDATE(
&state->search_cabac,