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uvg266/src/encode_coding_tree.c

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/*****************************************************************************
* This file is part of Kvazaar HEVC encoder.
*
* Copyright (C) 2013-2015 Tampere University of Technology and others (see
* COPYING file).
*
* Kvazaar is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#include "encode_coding_tree.h"
#include "cabac.h"
#include "context.h"
#include "cu.h"
#include "encoder.h"
#include "extras/crypto.h"
#include "imagelist.h"
#include "inter.h"
#include "intra.h"
#include "kvazaar.h"
#include "kvz_math.h"
#include "strategyselector.h"
#include "tables.h"
#include "videoframe.h"
/**
* \brief Encode (X,Y) position of the last significant coefficient
*
* \param lastpos_x X component of last coefficient
* \param lastpos_y Y component of last coefficient
* \param width Block width
* \param height Block height
* \param type plane type / luminance or chrominance
* \param scan scan type (diag, hor, ver)
*
* This method encodes the X and Y component within a block of the last
* significant coefficient.
*/
void kvz_encode_last_significant_xy(cabac_data_t * const cabac,
uint8_t lastpos_x, uint8_t lastpos_y,
uint8_t width, uint8_t height,
uint8_t type, uint8_t scan)
{
const int index = kvz_math_floor_log2(width) - 2;
uint8_t ctx_offset = type ? 0 : (index * 3 + (index + 1) / 4);
uint8_t shift = type ? index : (index + 3) / 4;
cabac_ctx_t *base_ctx_x = (type ? cabac->ctx.cu_ctx_last_x_chroma : cabac->ctx.cu_ctx_last_x_luma);
cabac_ctx_t *base_ctx_y = (type ? cabac->ctx.cu_ctx_last_y_chroma : cabac->ctx.cu_ctx_last_y_luma);
if (scan == SCAN_VER) {
SWAP(lastpos_x, lastpos_y, uint8_t);
}
const int group_idx_x = g_group_idx[lastpos_x];
const int group_idx_y = g_group_idx[lastpos_y];
// x prefix
for (int last_x = 0; last_x < group_idx_x; last_x++) {
cabac->cur_ctx = &base_ctx_x[ctx_offset + (last_x >> shift)];
CABAC_BIN(cabac, 1, "last_sig_coeff_x_prefix");
}
if (group_idx_x < g_group_idx[width - 1]) {
cabac->cur_ctx = &base_ctx_x[ctx_offset + (group_idx_x >> shift)];
CABAC_BIN(cabac, 0, "last_sig_coeff_x_prefix");
}
// y prefix
for (int last_y = 0; last_y < group_idx_y; last_y++) {
cabac->cur_ctx = &base_ctx_y[ctx_offset + (last_y >> shift)];
CABAC_BIN(cabac, 1, "last_sig_coeff_y_prefix");
}
if (group_idx_y < g_group_idx[height - 1]) {
cabac->cur_ctx = &base_ctx_y[ctx_offset + (group_idx_y >> shift)];
CABAC_BIN(cabac, 0, "last_sig_coeff_y_prefix");
}
// last_sig_coeff_x_suffix
if (group_idx_x > 3) {
const int suffix = lastpos_x - g_min_in_group[group_idx_x];
const int bits = (group_idx_x - 2) / 2;
CABAC_BINS_EP(cabac, suffix, bits, "last_sig_coeff_x_suffix");
}
// last_sig_coeff_y_suffix
if (group_idx_y > 3) {
const int suffix = lastpos_y - g_min_in_group[group_idx_y];
const int bits = (group_idx_y - 2) / 2;
CABAC_BINS_EP(cabac, suffix, bits, "last_sig_coeff_y_suffix");
}
}
static void encode_transform_unit(encoder_state_t * const state,
int x, int y, int depth)
{
assert(depth >= 1 && depth <= MAX_PU_DEPTH);
const videoframe_t * const frame = state->tile->frame;
const uint8_t width = LCU_WIDTH >> depth;
const uint8_t width_c = (depth == MAX_PU_DEPTH ? width : width / 2);
const cu_info_t *cur_pu = kvz_cu_array_at_const(frame->cu_array, x, y);
int8_t scan_idx = kvz_get_scan_order(cur_pu->type, cur_pu->intra.mode, depth);
int cbf_y = cbf_is_set(cur_pu->cbf, depth, COLOR_Y);
if (cbf_y) {
int x_local = x % LCU_WIDTH;
int y_local = y % LCU_WIDTH;
const coeff_t *coeff_y = &state->coeff->y[xy_to_zorder(LCU_WIDTH, x_local, y_local)];
// CoeffNxN
// Residual Coding
kvz_encode_coeff_nxn(state,
&state->cabac,
coeff_y,
width,
0,
scan_idx,
cur_pu->tr_skip);
}
if (depth == MAX_DEPTH + 1) {
// For size 4x4 luma transform the corresponding chroma transforms are
// also of size 4x4 covering 8x8 luma pixels. The residual is coded in
// the last transform unit.
if (x % 8 == 0 || y % 8 == 0) {
// Not the last luma transform block so there is nothing more to do.
return;
} else {
// Time to to code the chroma transform blocks. Move to the top-left
// corner of the block.
x -= 4;
y -= 4;
cur_pu = kvz_cu_array_at_const(frame->cu_array, x, y);
}
}
bool chroma_cbf_set = cbf_is_set(cur_pu->cbf, depth, COLOR_U) ||
cbf_is_set(cur_pu->cbf, depth, COLOR_V);
if (chroma_cbf_set) {
int x_local = (x >> 1) % LCU_WIDTH_C;
int y_local = (y >> 1) % LCU_WIDTH_C;
scan_idx = kvz_get_scan_order(cur_pu->type, cur_pu->intra.mode_chroma, depth);
const coeff_t *coeff_u = &state->coeff->u[xy_to_zorder(LCU_WIDTH_C, x_local, y_local)];
const coeff_t *coeff_v = &state->coeff->v[xy_to_zorder(LCU_WIDTH_C, x_local, y_local)];
if (cbf_is_set(cur_pu->cbf, depth, COLOR_U)) {
kvz_encode_coeff_nxn(state, &state->cabac, coeff_u, width_c, 2, scan_idx, 0);
}
if (cbf_is_set(cur_pu->cbf, depth, COLOR_V)) {
kvz_encode_coeff_nxn(state, &state->cabac, coeff_v, width_c, 2, scan_idx, 0);
}
}
}
/**
* \param encoder
* \param x_pu Prediction units' x coordinate.
* \param y_pu Prediction units' y coordinate.
* \param depth Depth from LCU.
* \param tr_depth Depth from last CU.
* \param parent_coeff_u What was signaled at previous level for cbf_cb.
* \param parent_coeff_v What was signlaed at previous level for cbf_cr.
*/
static void encode_transform_coeff(encoder_state_t * const state,
int32_t x,
int32_t y,
int8_t depth,
int8_t tr_depth,
uint8_t parent_coeff_u,
uint8_t parent_coeff_v)
{
cabac_data_t * const cabac = &state->cabac;
const encoder_control_t *const ctrl = state->encoder_control;
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cur_pu = kvz_cu_array_at_const(frame->cu_array, x, y);
// Round coordinates down to a multiple of 8 to get the location of the
// containing CU.
const int x_cu = 8 * (x / 8);
const int y_cu = 8 * (y / 8);
const cu_info_t *cur_cu = kvz_cu_array_at_const(frame->cu_array, x_cu, y_cu);
// NxN signifies implicit transform split at the first transform level.
// There is a similar implicit split for inter, but it is only used when
// transform hierarchy is not in use.
int intra_split_flag = (cur_cu->type == CU_INTRA && cur_cu->part_size == SIZE_NxN);
// The implicit split by intra NxN is not counted towards max_tr_depth.
int max_tr_depth;
if (cur_cu->type == CU_INTRA) {
max_tr_depth = ctrl->cfg.tr_depth_intra + intra_split_flag;
} else {
max_tr_depth = ctrl->tr_depth_inter;
}
int8_t split = (cur_cu->tr_depth > depth);
const int cb_flag_y = cbf_is_set(cur_pu->cbf, depth, COLOR_Y);
const int cb_flag_u = cbf_is_set(cur_cu->cbf, depth, COLOR_U);
const int cb_flag_v = cbf_is_set(cur_cu->cbf, depth, COLOR_V);
// The split_transform_flag is not signaled when:
// - transform size is greater than 32 (depth == 0)
// - transform size is 4 (depth == MAX_PU_DEPTH)
// - transform depth is max
// - cu is intra NxN and it's the first split
if (depth > 0 &&
depth < MAX_PU_DEPTH &&
tr_depth < max_tr_depth &&
!(intra_split_flag && tr_depth == 0))
{
cabac->cur_ctx = &(cabac->ctx.trans_subdiv_model[5 - ((kvz_g_convert_to_bit[LCU_WIDTH] + 2) - depth)]);
CABAC_BIN(cabac, split, "split_transform_flag");
}
// Chroma cb flags are not signaled when one of the following:
// - transform size is 4 (2x2 chroma transform doesn't exist)
// - they have already been signaled to 0 previously
// When they are not present they are inferred to be 0, except for size 4
// when the flags from previous level are used.
if (depth < MAX_PU_DEPTH && state->encoder_control->chroma_format != KVZ_CSP_400) {
cabac->cur_ctx = &(cabac->ctx.qt_cbf_model_chroma[tr_depth]);
if (tr_depth == 0 || parent_coeff_u) {
CABAC_BIN(cabac, cb_flag_u, "cbf_cb");
}
if (tr_depth == 0 || parent_coeff_v) {
CABAC_BIN(cabac, cb_flag_v, "cbf_cr");
}
}
if (split) {
uint8_t offset = LCU_WIDTH >> (depth + 1);
int x2 = x + offset;
int y2 = y + offset;
encode_transform_coeff(state, x, y, depth + 1, tr_depth + 1, cb_flag_u, cb_flag_v);
encode_transform_coeff(state, x2, y, depth + 1, tr_depth + 1, cb_flag_u, cb_flag_v);
encode_transform_coeff(state, x, y2, depth + 1, tr_depth + 1, cb_flag_u, cb_flag_v);
encode_transform_coeff(state, x2, y2, depth + 1, tr_depth + 1, cb_flag_u, cb_flag_v);
return;
}
// Luma coded block flag is signaled when one of the following:
// - prediction mode is intra
// - transform depth > 0
// - we have chroma coefficients at this level
// When it is not present, it is inferred to be 1.
if (cur_cu->type == CU_INTRA || tr_depth > 0 || cb_flag_u || cb_flag_v) {
cabac->cur_ctx = &(cabac->ctx.qt_cbf_model_luma[!tr_depth]);
CABAC_BIN(cabac, cb_flag_y, "cbf_luma");
}
if (cb_flag_y | cb_flag_u | cb_flag_v) {
if (state->must_code_qp_delta) {
const int qp_pred = kvz_get_cu_ref_qp(state, x_cu, y_cu, state->last_qp);
const int qp_delta = cur_cu->qp - qp_pred;
assert(KVZ_BIT_DEPTH == 8 && "This range applies only to 8-bit encoding.");
assert(qp_delta >= -26 && qp_delta <= 25 && "QP delta not in valid range [-26, 25]."); // This range applies only to 8-bit encoding
const int qp_delta_abs = ABS(qp_delta);
cabac_data_t* cabac = &state->cabac;
// cu_qp_delta_abs prefix
cabac->cur_ctx = &cabac->ctx.cu_qp_delta_abs[0];
kvz_cabac_write_unary_max_symbol(cabac, cabac->ctx.cu_qp_delta_abs, MIN(qp_delta_abs, 5), 1, 5);
if (qp_delta_abs >= 5) {
// cu_qp_delta_abs suffix
kvz_cabac_write_ep_ex_golomb(state, cabac, qp_delta_abs - 5, 0);
}
if (qp_delta != 0) {
CABAC_BIN_EP(cabac, (qp_delta >= 0 ? 0 : 1), "qp_delta_sign_flag");
}
state->must_code_qp_delta = false;
}
encode_transform_unit(state, x, y, depth);
}
}
static void encode_inter_prediction_unit(encoder_state_t * const state,
cabac_data_t * const cabac,
const cu_info_t * const cur_cu,
int x, int y, int width, int height,
int depth)
{
// Mergeflag
int16_t num_cand = 0;
cabac->cur_ctx = &(cabac->ctx.cu_merge_flag_ext_model);
CABAC_BIN(cabac, cur_cu->merged, "MergeFlag");
num_cand = state->encoder_control->cfg.max_merge;
if (cur_cu->merged) { //merge
if (num_cand > 1) {
int32_t ui;
for (ui = 0; ui < num_cand - 1; ui++) {
int32_t symbol = (ui != cur_cu->merge_idx);
if (ui == 0) {
cabac->cur_ctx = &(cabac->ctx.cu_merge_idx_ext_model);
CABAC_BIN(cabac, symbol, "MergeIndex");
} else {
CABAC_BIN_EP(cabac,symbol,"MergeIndex");
}
if (symbol == 0) break;
}
}
} else {
if (state->frame->slicetype == KVZ_SLICE_B) {
// Code Inter Dir
uint8_t inter_dir = cur_cu->inter.mv_dir-1;
if (cur_cu->part_size == SIZE_2Nx2N || (LCU_WIDTH >> depth) != 8) {
cabac->cur_ctx = &(cabac->ctx.inter_dir[depth]);
CABAC_BIN(cabac, (inter_dir == 2), "inter_pred_idc");
}
if (inter_dir < 2) {
cabac->cur_ctx = &(cabac->ctx.inter_dir[4]);
CABAC_BIN(cabac, inter_dir, "inter_pred_idc");
}
}
for (uint32_t ref_list_idx = 0; ref_list_idx < 2; ref_list_idx++) {
if (!(cur_cu->inter.mv_dir & (1 << ref_list_idx))) {
continue;
}
// size of the current reference index list (L0/L1)
uint8_t ref_LX_size = state->frame->ref_LX_size[ref_list_idx];
if (ref_LX_size > 1) {
// parseRefFrmIdx
int32_t ref_frame = cur_cu->inter.mv_ref[ref_list_idx];
cabac->cur_ctx = &(cabac->ctx.cu_ref_pic_model[0]);
CABAC_BIN(cabac, (ref_frame != 0), "ref_idx_lX");
if (ref_frame > 0) {
ref_frame--;
int32_t ref_num = ref_LX_size - 2;
for (int32_t i = 0; i < ref_num; ++i) {
const uint32_t symbol = (i == ref_frame) ? 0 : 1;
if (i == 0) {
cabac->cur_ctx = &cabac->ctx.cu_ref_pic_model[1];
CABAC_BIN(cabac, symbol, "ref_idx_lX");
} else {
CABAC_BIN_EP(cabac, symbol, "ref_idx_lX");
}
if (symbol == 0) break;
}
}
}
if (state->frame->ref_list != REF_PIC_LIST_1 || cur_cu->inter.mv_dir != 3) {
int16_t mv_cand[2][2];
kvz_inter_get_mv_cand_cua(
state,
x, y, width, height,
mv_cand, cur_cu, ref_list_idx);
uint8_t cu_mv_cand = CU_GET_MV_CAND(cur_cu, ref_list_idx);
const int32_t mvd_hor = cur_cu->inter.mv[ref_list_idx][0] - mv_cand[cu_mv_cand][0];
const int32_t mvd_ver = cur_cu->inter.mv[ref_list_idx][1] - mv_cand[cu_mv_cand][1];
kvz_encode_mvd(state, cabac, mvd_hor, mvd_ver);
}
// Signal which candidate MV to use
kvz_cabac_write_unary_max_symbol(cabac,
cabac->ctx.mvp_idx_model,
CU_GET_MV_CAND(cur_cu, ref_list_idx),
1,
AMVP_MAX_NUM_CANDS - 1);
} // for ref_list
} // if !merge
}
static INLINE uint8_t intra_mode_encryption(encoder_state_t * const state,
uint8_t intra_pred_mode)
{
const uint8_t sets[3][17] =
{
{ 0, 1, 2, 3, 4, 5, 15, 16, 17, 18, 19, 20, 21, 31, 32, 33, 34}, /* 17 */
{ 22, 23, 24, 25, 27, 28, 29, 30, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 9 */
{ 6, 7, 8, 9, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1, -1} /* 9 */
};
const uint8_t nb_elems[3] = {17, 8, 8};
if (intra_pred_mode == 26 || intra_pred_mode == 10) {
// correct chroma intra prediction mode
return intra_pred_mode;
} else {
uint8_t keybits, scan_dir, elem_idx=0;
keybits = kvz_crypto_get_key(state->crypto_hdl, 5);
scan_dir = SCAN_DIAG;
if (intra_pred_mode > 5 && intra_pred_mode < 15) {
scan_dir = SCAN_VER;
}
if (intra_pred_mode > 21 && intra_pred_mode < 31) {
scan_dir = SCAN_HOR;
}
for (int i = 0; i < nb_elems[scan_dir]; i++) {
if (intra_pred_mode == sets[scan_dir][i]) {
elem_idx = i;
break;
}
}
keybits = keybits % nb_elems[scan_dir];
keybits = (elem_idx + keybits) % nb_elems[scan_dir];
return sets[scan_dir][keybits];
}
}
static void encode_intra_coding_unit(encoder_state_t * const state,
cabac_data_t * const cabac,
const cu_info_t * const cur_cu,
int x, int y, int depth)
{
const videoframe_t * const frame = state->tile->frame;
uint8_t intra_pred_mode_actual[4];
uint8_t *intra_pred_mode = intra_pred_mode_actual;
#if KVZ_SEL_ENCRYPTION
const bool do_crypto =
!state->cabac.only_count &&
state->encoder_control->cfg.crypto_features & KVZ_CRYPTO_INTRA_MODE;
#else
const bool do_crypto = false;
#endif
uint8_t intra_pred_mode_encry[4] = {-1, -1, -1, -1};
if (do_crypto) {
intra_pred_mode = intra_pred_mode_encry;
}
uint8_t intra_pred_mode_chroma = cur_cu->intra.mode_chroma;
int8_t intra_preds[4][3] = {{-1, -1, -1},{-1, -1, -1},{-1, -1, -1},{-1, -1, -1}};
int8_t mpm_preds[4] = {-1, -1, -1, -1};
uint32_t flag[4];
#if ENABLE_PCM == 1
// Code must start after variable initialization
kvz_cabac_encode_bin_trm(cabac, 0); // IPCMFlag == 0
#endif
// PREDINFO CODING
// If intra prediction mode is found from the predictors,
// it can be signaled with two EP's. Otherwise we can send
// 5 EP bins with the full predmode
const int num_pred_units = kvz_part_mode_num_parts[cur_cu->part_size];
const int cu_width = LCU_WIDTH >> depth;
for (int j = 0; j < num_pred_units; ++j) {
const int pu_x = PU_GET_X(cur_cu->part_size, cu_width, x, j);
const int pu_y = PU_GET_Y(cur_cu->part_size, cu_width, y, j);
const cu_info_t *cur_pu = kvz_cu_array_at_const(frame->cu_array, pu_x, pu_y);
const cu_info_t *left_pu = NULL;
const cu_info_t *above_pu = NULL;
if (pu_x > 0) {
assert(pu_x >> 2 > 0);
left_pu = kvz_cu_array_at_const(frame->cu_array, pu_x - 1, pu_y);
}
// Don't take the above PU across the LCU boundary.
if (pu_y % LCU_WIDTH > 0 && pu_y > 0) {
assert(pu_y >> 2 > 0);
above_pu = kvz_cu_array_at_const(frame->cu_array, pu_x, pu_y - 1);
}
if (do_crypto) {
#if KVZ_SEL_ENCRYPTION
// Need to wrap in preprocessor directives because this function is
// only defined when KVZ_SEL_ENCRYPTION is defined.
kvz_intra_get_dir_luma_predictor_encry(pu_x, pu_y,
intra_preds[j],
cur_pu,
left_pu, above_pu);
#endif
} else {
kvz_intra_get_dir_luma_predictor(pu_x, pu_y,
intra_preds[j],
cur_pu,
left_pu, above_pu);
}
intra_pred_mode_actual[j] = cur_pu->intra.mode;
if (do_crypto) {
intra_pred_mode_encry[j] = intra_mode_encryption(state, cur_pu->intra.mode);
}
for (int i = 0; i < 3; i++) {
if (intra_preds[j][i] == intra_pred_mode[j]) {
mpm_preds[j] = (int8_t)i;
break;
}
}
flag[j] = (mpm_preds[j] == -1) ? 0 : 1;
#if KVZ_SEL_ENCRYPTION
// Need to wrap in preprocessor directives because
// cu_info_t.intra.mode_encry is only defined when KVZ_SEL_ENCRYPTION
// is defined.
if (do_crypto) {
// Set the modified intra_pred_mode of the current pu here to make it
// available from its neighbours for mpm decision.
// FIXME: there might be a more efficient way to propagate mode_encry
// for future use from left and above PUs
const int pu_width = PU_GET_W(cur_cu->part_size, cu_width, j);
for (int y = pu_y; y < pu_y + pu_width; y += 4 ) {
for (int x = pu_x; x < pu_x + pu_width; x += 4) {
cu_info_t *cu = kvz_cu_array_at(frame->cu_array, x, y);
cu->intra.mode_encry = intra_pred_mode_encry[j];
}
}
}
#endif
}
cabac->cur_ctx = &(cabac->ctx.intra_mode_model);
for (int j = 0; j < num_pred_units; ++j) {
CABAC_BIN(cabac, flag[j], "prev_intra_luma_pred_flag");
}
for (int j = 0; j < num_pred_units; ++j) {
// Signal index of the prediction mode in the prediction list.
if (flag[j]) {
CABAC_BIN_EP(cabac, (mpm_preds[j] == 0 ? 0 : 1), "mpm_idx");
if (mpm_preds[j] != 0) {
CABAC_BIN_EP(cabac, (mpm_preds[j] == 1 ? 0 : 1), "mpm_idx");
}
} else {
// Signal the actual prediction mode.
int32_t tmp_pred = intra_pred_mode[j];
// Sort prediction list from lowest to highest.
if (intra_preds[j][0] > intra_preds[j][1]) SWAP(intra_preds[j][0], intra_preds[j][1], int8_t);
if (intra_preds[j][0] > intra_preds[j][2]) SWAP(intra_preds[j][0], intra_preds[j][2], int8_t);
if (intra_preds[j][1] > intra_preds[j][2]) SWAP(intra_preds[j][1], intra_preds[j][2], int8_t);
// Reduce the index of the signaled prediction mode according to the
// prediction list, as it has been already signaled that it's not one
// of the prediction modes.
for (int i = 2; i >= 0; i--) {
tmp_pred = (tmp_pred > intra_preds[j][i] ? tmp_pred - 1 : tmp_pred);
}
CABAC_BINS_EP(cabac, tmp_pred, 5, "rem_intra_luma_pred_mode");
}
}
// Code chroma prediction mode.
if (state->encoder_control->chroma_format != KVZ_CSP_400) {
unsigned pred_mode = 5;
unsigned chroma_pred_modes[4] = {0, 26, 10, 1};
if (intra_pred_mode_chroma == intra_pred_mode_actual[0]) {
pred_mode = 4;
} else if (intra_pred_mode_chroma == 34) {
// Angular 34 mode is possible only if intra pred mode is one of the
// possible chroma pred modes, in which case it is signaled with that
// duplicate mode.
for (int i = 0; i < 4; ++i) {
if (intra_pred_mode_actual[0] == chroma_pred_modes[i]) pred_mode = i;
}
} else {
for (int i = 0; i < 4; ++i) {
if (intra_pred_mode_chroma == chroma_pred_modes[i]) pred_mode = i;
}
}
// pred_mode == 5 mean intra_pred_mode_chroma is something that can't
// be coded.
assert(pred_mode != 5);
/**
* Table 9-35 - Binarization for intra_chroma_pred_mode
* intra_chroma_pred_mode bin_string
* 4 0
* 0 100
* 1 101
* 2 110
* 3 111
* Table 9-37 - Assignment of ctxInc to syntax elements with context coded bins
* intra_chroma_pred_mode[][] = 0, bypass, bypass
*/
cabac->cur_ctx = &(cabac->ctx.chroma_pred_model[0]);
if (pred_mode == 4) {
CABAC_BIN(cabac, 0, "intra_chroma_pred_mode");
} else {
CABAC_BIN(cabac, 1, "intra_chroma_pred_mode");
CABAC_BINS_EP(cabac, pred_mode, 2, "intra_chroma_pred_mode");
}
}
encode_transform_coeff(state, x, y, depth, 0, 0, 0);
}
static void encode_part_mode(encoder_state_t * const state,
cabac_data_t * const cabac,
const cu_info_t * const cur_cu,
int depth)
{
// Binarization from Table 9-34 of the HEVC spec:
//
// | log2CbSize > | log2CbSize ==
// | MinCbLog2SizeY | MinCbLog2SizeY
// -------+-------+----------+---------+-----------+----------
// pred | part | AMP | AMP | |
// mode | mode | disabled | enabled | size == 8 | size > 8
// -------+-------+----------+---------+-----------+----------
// intra | 2Nx2N | - - | 1 1
// | NxN | - - | 0 0
// -------+-------+--------------------+----------------------
// inter | 2Nx2N | 1 1 | 1 1
// | 2NxN | 01 011 | 01 01
// | Nx2N | 00 001 | 00 001
// | NxN | - - | - 000
// | 2NxnU | - 0100 | - -
// | 2NxnD | - 0101 | - -
// | nLx2N | - 0000 | - -
// | nRx2N | - 0001 | - -
// -------+-------+--------------------+----------------------
//
//
// Context indices from Table 9-37 of the HEVC spec:
//
// binIdx
// | 0 1 2 3
// ------------------------------+------------------
// log2CbSize == MinCbLog2SizeY | 0 1 2 bypass
// log2CbSize > MinCbLog2SizeY | 0 1 3 bypass
// ------------------------------+------------------
if (cur_cu->type == CU_INTRA) {
if (depth == MAX_DEPTH) {
cabac->cur_ctx = &(cabac->ctx.part_size_model[0]);
if (cur_cu->part_size == SIZE_2Nx2N) {
CABAC_BIN(cabac, 1, "part_mode 2Nx2N");
} else {
CABAC_BIN(cabac, 0, "part_mode NxN");
}
}
} else {
cabac->cur_ctx = &(cabac->ctx.part_size_model[0]);
if (cur_cu->part_size == SIZE_2Nx2N) {
CABAC_BIN(cabac, 1, "part_mode 2Nx2N");
return;
}
CABAC_BIN(cabac, 0, "part_mode split");
cabac->cur_ctx = &(cabac->ctx.part_size_model[1]);
if (cur_cu->part_size == SIZE_2NxN ||
cur_cu->part_size == SIZE_2NxnU ||
cur_cu->part_size == SIZE_2NxnD) {
CABAC_BIN(cabac, 1, "part_mode vertical");
} else {
CABAC_BIN(cabac, 0, "part_mode horizontal");
}
if (state->encoder_control->cfg.amp_enable && depth < MAX_DEPTH) {
cabac->cur_ctx = &(cabac->ctx.part_size_model[3]);
if (cur_cu->part_size == SIZE_2NxN ||
cur_cu->part_size == SIZE_Nx2N) {
CABAC_BIN(cabac, 1, "part_mode SMP");
return;
}
CABAC_BIN(cabac, 0, "part_mode AMP");
if (cur_cu->part_size == SIZE_2NxnU ||
cur_cu->part_size == SIZE_nLx2N) {
CABAC_BINS_EP(cabac, 0, 1, "part_mode AMP");
} else {
CABAC_BINS_EP(cabac, 1, 1, "part_mode AMP");
}
}
}
}
void kvz_encode_coding_tree(encoder_state_t * const state,
uint16_t x,
uint16_t y,
uint8_t depth)
{
cabac_data_t * const cabac = &state->cabac;
const encoder_control_t * const ctrl = state->encoder_control;
const videoframe_t * const frame = state->tile->frame;
const cu_info_t *cur_cu = kvz_cu_array_at_const(frame->cu_array, x, y);
const int cu_width = LCU_WIDTH >> depth;
const int half_cu = cu_width >> 1;
const cu_info_t *left_cu = NULL;
if (x > 0) {
left_cu = kvz_cu_array_at_const(frame->cu_array, x - 1, y);
}
const cu_info_t *above_cu = NULL;
if (y > 0) {
above_cu = kvz_cu_array_at_const(frame->cu_array, x, y - 1);
}
uint8_t split_flag = GET_SPLITDATA(cur_cu, depth);
uint8_t split_model = 0;
// Absolute coordinates
uint16_t abs_x = x + state->tile->offset_x;
uint16_t abs_y = y + state->tile->offset_y;
// Check for slice border
bool border_x = ctrl->in.width < abs_x + cu_width;
bool border_y = ctrl->in.height < abs_y + cu_width;
bool border_split_x = ctrl->in.width >= abs_x + (LCU_WIDTH >> MAX_DEPTH) + half_cu;
bool border_split_y = ctrl->in.height >= abs_y + (LCU_WIDTH >> MAX_DEPTH) + half_cu;
bool border = border_x || border_y; /*!< are we in any border CU */
if (depth <= ctrl->max_qp_delta_depth) {
state->must_code_qp_delta = true;
}
// When not in MAX_DEPTH, insert split flag and split the blocks if needed
if (depth != MAX_DEPTH) {
// Implisit split flag when on border
if (!border) {
// Get left and top block split_flags and if they are present and true, increase model number
if (left_cu && GET_SPLITDATA(left_cu, depth) == 1) {
split_model++;
}
if (above_cu && GET_SPLITDATA(above_cu, depth) == 1) {
split_model++;
}
cabac->cur_ctx = &(cabac->ctx.split_flag_model[split_model]);
CABAC_BIN(cabac, split_flag, "SplitFlag");
}
if (split_flag || border) {
// Split blocks and remember to change x and y block positions
kvz_encode_coding_tree(state, x, y, depth + 1);
if (!border_x || border_split_x) {
kvz_encode_coding_tree(state, x + half_cu, y, depth + 1);
}
if (!border_y || border_split_y) {
kvz_encode_coding_tree(state, x, y + half_cu, depth + 1);
}
if (!border || (border_split_x && border_split_y)) {
kvz_encode_coding_tree(state, x + half_cu, y + half_cu, depth + 1);
}
return;
}
}
if (ctrl->cfg.lossless) {
cabac->cur_ctx = &cabac->ctx.cu_transquant_bypass;
CABAC_BIN(cabac, 1, "cu_transquant_bypass_flag");
}
// Encode skip flag
if (state->frame->slicetype != KVZ_SLICE_I) {
// uiCtxSkip = aboveskipped + leftskipped;
int8_t ctx_skip = 0;
if (left_cu && left_cu->skipped) {
ctx_skip++;
}
if (above_cu && above_cu->skipped) {
ctx_skip++;
}
cabac->cur_ctx = &(cabac->ctx.cu_skip_flag_model[ctx_skip]);
CABAC_BIN(cabac, cur_cu->skipped, "SkipFlag");
if (cur_cu->skipped) {
int16_t num_cand = state->encoder_control->cfg.max_merge;
if (num_cand > 1) {
for (int ui = 0; ui < num_cand - 1; ui++) {
int32_t symbol = (ui != cur_cu->merge_idx);
if (ui == 0) {
cabac->cur_ctx = &(cabac->ctx.cu_merge_idx_ext_model);
CABAC_BIN(cabac, symbol, "MergeIndex");
} else {
CABAC_BIN_EP(cabac,symbol,"MergeIndex");
}
if (symbol == 0) {
break;
}
}
}
goto end;
}
}
// Prediction mode
if (state->frame->slicetype != KVZ_SLICE_I) {
cabac->cur_ctx = &(cabac->ctx.cu_pred_mode_model);
CABAC_BIN(cabac, (cur_cu->type == CU_INTRA), "PredMode");
}
// part_mode
encode_part_mode(state, cabac, cur_cu, depth);
if (cur_cu->type == CU_INTER) {
const int num_pu = kvz_part_mode_num_parts[cur_cu->part_size];
for (int i = 0; i < num_pu; ++i) {
const int pu_x = PU_GET_X(cur_cu->part_size, cu_width, x, i);
const int pu_y = PU_GET_Y(cur_cu->part_size, cu_width, y, i);
const int pu_w = PU_GET_W(cur_cu->part_size, cu_width, i);
const int pu_h = PU_GET_H(cur_cu->part_size, cu_width, i);
const cu_info_t *cur_pu = kvz_cu_array_at_const(frame->cu_array, pu_x, pu_y);
encode_inter_prediction_unit(state, cabac, cur_pu, pu_x, pu_y, pu_w, pu_h, depth);
}
{
int cbf = cbf_is_set_any(cur_cu->cbf, depth);
// Only need to signal coded block flag if not skipped or merged
// skip = no coded residual, merge = coded residual
if (cur_cu->part_size != SIZE_2Nx2N || !cur_cu->merged) {
cabac->cur_ctx = &(cabac->ctx.cu_qt_root_cbf_model);
CABAC_BIN(cabac, cbf, "rqt_root_cbf");
}
// Code (possible) coeffs to bitstream
if (cbf) {
encode_transform_coeff(state, x, y, depth, 0, 0, 0);
}
}
} else if (cur_cu->type == CU_INTRA) {
encode_intra_coding_unit(state, cabac, cur_cu, x, y, depth);
}
#if ENABLE_PCM
// Code IPCM block
else if (cur_cu->type == CU_PCM) {
kvz_cabac_encode_bin_trm(cabac, 1); // IPCMFlag == 1
kvz_cabac_finish(cabac);
kvz_bitstream_add_rbsp_trailing_bits(cabac.stream);
// PCM sample
pixel *base_y = &cur_pic->y_data[x + y * encoder->in.width];
pixel *base_u = &cur_pic->u_data[x / 2 + y / 2 * encoder->in.width / 2];
pixel *base_v = &cur_pic->v_data[x / 2 + y / 2 * encoder->in.width / 2];
// Luma
for (unsigned y_px = 0; y_px < LCU_WIDTH >> depth; y_px++) {
for (unsigned x_px = 0; x_px < LCU_WIDTH >> depth; x_px++) {
kvz_bitstream_put(cabac.stream, base_y[x_px + y_px * encoder->in.width], 8);
}
}
// Chroma
if (encoder->in.video_format != FORMAT_400) {
for (unsigned y_px = 0; y_px < LCU_WIDTH >> (depth + 1); y_px++) {
for (unsigned x_px = 0; x_px < LCU_WIDTH >> (depth + 1); x_px++) {
kvz_bitstream_put(cabac.stream, base_u[x_px + y_px * (encoder->in.width >> 1)], 8);
}
}
for (unsigned y_px = 0; y_px < LCU_WIDTH >> (depth + 1); y_px++) {
for (unsigned x_px = 0; x_px < LCU_WIDTH >> (depth + 1); x_px++) {
kvz_bitstream_put(cabac.stream, base_v[x_px + y_px * (encoder->in.width >> 1)], 8);
}
}
}
kvz_cabac_start(cabac);
}
#endif
else {
// CU type not set. Should not happen.
assert(0);
exit(1);
}
end:
if (is_last_cu_in_qg(state, x, y, depth)) {
state->last_qp = cur_cu->qp;
}
}
void kvz_encode_mvd(encoder_state_t * const state,
cabac_data_t *cabac,
int32_t mvd_hor,
int32_t mvd_ver)
{
const int8_t hor_abs_gr0 = mvd_hor != 0;
const int8_t ver_abs_gr0 = mvd_ver != 0;
const uint32_t mvd_hor_abs = abs(mvd_hor);
const uint32_t mvd_ver_abs = abs(mvd_ver);
cabac->cur_ctx = &cabac->ctx.cu_mvd_model[0];
CABAC_BIN(cabac, (mvd_hor != 0), "abs_mvd_greater0_flag_hor");
CABAC_BIN(cabac, (mvd_ver != 0), "abs_mvd_greater0_flag_ver");
cabac->cur_ctx = &cabac->ctx.cu_mvd_model[1];
if (hor_abs_gr0) {
CABAC_BIN(cabac, (mvd_hor_abs>1), "abs_mvd_greater1_flag_hor");
}
if (ver_abs_gr0) {
CABAC_BIN(cabac, (mvd_ver_abs>1), "abs_mvd_greater1_flag_ver");
}
if (hor_abs_gr0) {
if (mvd_hor_abs > 1) {
kvz_cabac_write_ep_ex_golomb(state, cabac, mvd_hor_abs - 2, 1);
}
uint32_t mvd_hor_sign = (mvd_hor > 0) ? 0 : 1;
if (!state->cabac.only_count &&
state->encoder_control->cfg.crypto_features & KVZ_CRYPTO_MV_SIGNS)
{
mvd_hor_sign = mvd_hor_sign ^ kvz_crypto_get_key(state->crypto_hdl, 1);
}
CABAC_BIN_EP(cabac, mvd_hor_sign, "mvd_sign_flag_hor");
}
if (ver_abs_gr0) {
if (mvd_ver_abs > 1) {
kvz_cabac_write_ep_ex_golomb(state, cabac, mvd_ver_abs - 2, 1);
}
uint32_t mvd_ver_sign = mvd_ver > 0 ? 0 : 1;
if (!state->cabac.only_count &&
state->encoder_control->cfg.crypto_features & KVZ_CRYPTO_MV_SIGNS)
{
mvd_ver_sign = mvd_ver_sign^kvz_crypto_get_key(state->crypto_hdl, 1);
}
CABAC_BIN_EP(cabac, mvd_ver_sign, "mvd_sign_flag_ver");
}
}
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