/******************************************************************************
*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
/**
******************************************************************************
* @file ihevce_cabac_cu_pu.c
*
* @brief
* This file contains function definitions for cabac entropy coding of CU
* and PU structures in HEVC syntax
*
* @author
* ittiam
*
* @List of Functions
* ihevce_cabac_encode_intra_pu()
* ihevce_cabac_encode_skip_flag()
* ihevce_cabac_encode_part_mode()
* ihevce_cabac_encode_merge_idx()
* ihevce_cabac_encode_inter_pred_idc()
* ihevce_cabac_encode_refidx()
* ihevce_cabac_encode_mvd()
* ihevce_cabac_encode_inter_pu()
* ihevce_cabac_encode_coding_unit()
* ihevce_cabac_encode_sao()
* ihevce_encode_coding_quadtree()
* ihevce_encode_slice_data()
*
******************************************************************************
*/
/*****************************************************************************/
/* File Includes */
/*****************************************************************************/
/* System include files */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <stdarg.h>
#include <math.h>
/* User include files */
#include "ihevc_typedefs.h"
#include "itt_video_api.h"
#include "ihevce_api.h"
#include "rc_cntrl_param.h"
#include "rc_frame_info_collector.h"
#include "rc_look_ahead_params.h"
#include "ihevc_defs.h"
#include "ihevc_structs.h"
#include "ihevc_platform_macros.h"
#include "ihevc_deblk.h"
#include "ihevc_itrans_recon.h"
#include "ihevc_chroma_itrans_recon.h"
#include "ihevc_chroma_intra_pred.h"
#include "ihevc_intra_pred.h"
#include "ihevc_inter_pred.h"
#include "ihevc_mem_fns.h"
#include "ihevc_padding.h"
#include "ihevc_weighted_pred.h"
#include "ihevc_sao.h"
#include "ihevc_resi_trans.h"
#include "ihevc_quant_iquant_ssd.h"
#include "ihevc_cabac_tables.h"
#include "ihevce_defs.h"
#include "ihevce_lap_enc_structs.h"
#include "ihevce_multi_thrd_structs.h"
#include "ihevce_me_common_defs.h"
#include "ihevce_had_satd.h"
#include "ihevce_error_codes.h"
#include "ihevce_bitstream.h"
#include "ihevce_cabac.h"
#include "ihevce_rdoq_macros.h"
#include "ihevce_function_selector.h"
#include "ihevce_enc_structs.h"
#include "ihevce_entropy_structs.h"
#include "ihevce_cmn_utils_instr_set_router.h"
#include "ihevce_enc_loop_structs.h"
#include "ihevce_trace.h"
#define TEST_CABAC_BITESTIMATE 0
// clang-format off
/**
******************************************************************************
* @brief LUT for binarization of inter partmode bins for cu size > mincu size
* as per Table9-34 of spec
*
* @input : amp_enable flag and part_mode
*
* @output : packed bins and count of bins as per following bit packed format
* Bins : (bits3-bit0) first bin starts from bit3
* Bins Count: (bits7-bit4)
* 0xFF in the following table is invalid entry
*
* @remarks See Table 9-34 of HEVC spec for Binarization of part_mode
*******************************************************************************
*/
#define INVALID 0xFF
const UWORD8 gu1_hevce_inter_part_mode_bins[2][8] = {
/* cusize > minCUsize, no amp */
{ 0x18, 0x24, 0x20, INVALID, INVALID, INVALID, INVALID, INVALID, },
/* cusize > minCUsize, amp enable, minCUsize > 8 (irrelevant) */
{ 0x18, 0x36, 0x32, INVALID, 0x44, 0x45, 0x40, 0x41, },
};
/**
******************************************************************************
* @brief LUT for binarization of inter partmode bins for cu size = mincu size
* as per Table9-34 of spec
*
* @input : mincusize==8 flag and part_mode
*
* @output : packed bins and count of bins as per following bit packed format
* Bins : (bits3-bit0) first bin starts from bit3
* Bins Count: (bits7-bit4)
* 0xFF in the following table is invalid entry
*
* @remarks See Table 9-34 of HEVC spec for Binarization of part_mode
*******************************************************************************
*/
const UWORD8 gu1_hevce_inter_part_mode_bins_mincu[2][4] = {
/* cusize == minCUsize, minCUsize > 8 */
{ 0x18, 0x24, 0x32, 0x30, },
/* cusize == minCUsize, minCUsize = 8 */
{ 0x18, 0x24, 0x20, INVALID },
};
// clang-format on
/*****************************************************************************/
/* Function Definitions */
/*****************************************************************************/
/**
******************************************************************************
*
* @brief Entropy encoding of luma and chroma intra pred modes
*
* @par Description
* Encodes prev_intra_ped_mode, mpm_idx and rem_intra_pred_mode for each
* luma partition and chrom intra pred of cu as per section:7.3.9.1
*
* Binzarization, context model as per Table 9-32 for luma
* Binzarization, context model as per Table 9-35, section 9.3.2.8 for chroma
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] part_mode
* indicates whether the mode is 2Nx2N or NxN luma parition
*
* @param[in] ps_enc_cu
* pointer to the intra cu whose luma and chroma pred modes are encoded
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_intra_pu(
entropy_context_t *ps_entropy_ctxt, WORD32 part_mode, cu_enc_loop_out_t *ps_enc_cu)
{
WORD32 error = IHEVCE_SUCCESS;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
intra_prev_rem_flags_t *ps_prev_mpm_rem_flags = &ps_enc_cu->as_prev_rem[0];
WORD32 i, num_parts;
/* intra can only be 2Nx2N partition or a NxN partition */
num_parts = (PART_NxN == part_mode) ? 4 : 1;
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
/*PIC_INFO : INTRA CU in frame*/
ps_entropy_ctxt->ps_pic_level_info->i8_total_intra_cu++;
ps_entropy_ctxt->ps_pic_level_info->i8_total_pu += num_parts;
ps_entropy_ctxt->ps_pic_level_info->i8_total_intra_pu += num_parts;
/*PIC_INFO : Total CU in frame based on cu size */
if(PART_2Nx2N == part_mode)
{
// clang-format off
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_intra_pu[3]++;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_intra_pu[cu_size >> 4]++;
// clang-format on
}
else if(PART_NxN == part_mode)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_nxn_intra_pu++;
}
}
/* encode prev intra pred mode flags : context model based */
for(i = 0; i < num_parts; i++)
{
WORD32 prev_intra_pred_flag = ps_prev_mpm_rem_flags[i].b1_prev_intra_luma_pred_flag;
error |=
ihevce_cabac_encode_bin(ps_cabac, prev_intra_pred_flag, IHEVC_CAB_INTRA_LUMA_PRED_FLAG);
AEV_TRACE("prev_intra_pred_luma_flag", prev_intra_pred_flag, ps_cabac->u4_range);
}
/* encode mpm_idx or rem_intra_pred_mode bypass bins */
for(i = 0; i < num_parts; i++)
{
if(ps_prev_mpm_rem_flags[i].b1_prev_intra_luma_pred_flag)
{
WORD32 mpm_idx = ps_prev_mpm_rem_flags[i].b2_mpm_idx;
/* tunary bins for cmax = 2 */
WORD32 num_bins = mpm_idx ? 2 : 1;
UWORD32 bins = mpm_idx ? ((1 << 1) | (mpm_idx - 1)) : 0;
ASSERT(mpm_idx < 3);
error |= ihevce_cabac_encode_bypass_bins(ps_cabac, bins, num_bins);
AEV_TRACE("mpm_idx", mpm_idx, ps_cabac->u4_range);
}
else
{
WORD32 rem_intra_pred_mode = ps_prev_mpm_rem_flags[i].b5_rem_intra_pred_mode;
error |= ihevce_cabac_encode_bypass_bins(ps_cabac, rem_intra_pred_mode, 5);
AEV_TRACE("rem_intra_luma_pred_mode", rem_intra_pred_mode, ps_cabac->u4_range);
}
}
/************************************************************************/
/* encode the chroma intra prediction mode as per Table 9-35 */
/* First bin is context model based prefix : 0 if chroma_mode==4 else 1 */
/* If chroma pred mode is not 4, suffix bins are coded as bypass bins */
/************************************************************************/
{
WORD32 chroma_pred_mode = ps_enc_cu->b3_chroma_intra_pred_mode;
WORD32 prefix_bin = (chroma_pred_mode == 4) ? 0 : 1;
/* encode prefix bin */
error |= ihevce_cabac_encode_bin(ps_cabac, prefix_bin, IHEVC_CAB_CHROMA_PRED_MODE);
/* encode suffix bins */
if(prefix_bin)
{
error |= ihevce_cabac_encode_bypass_bins(ps_cabac, chroma_pred_mode, 2);
}
AEV_TRACE("intra_chroma_pred_mode", chroma_pred_mode, ps_cabac->u4_range);
}
return (error);
}
/**
******************************************************************************
*
* @brief Entropy encoding of skip flag (Coding Unit syntax)
*
* @par Description
* context increment for skip flag is derived based on left and top skip flag
* as per section 9.3.3.1.1, Table 9-38
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] ps_enc_cu
* pointer to inter cu whose skip flag is to be coded
*
* @param[in] top_avail
* top availabilty flag for current cu (boolean)
*
* @param[in] left_avail
* left availabilty flag for current cu (boolean)
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_skip_flag(
entropy_context_t *ps_entropy_ctxt,
cu_enc_loop_out_t *ps_enc_cu,
WORD32 top_avail,
WORD32 left_avail)
{
WORD32 error = IHEVCE_SUCCESS;
WORD32 skip_flag = ps_enc_cu->b1_skip_flag;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
/* CU top left co-ordinates w.r.t ctb */
WORD32 cu_x0 = ps_enc_cu->b3_cu_pos_x << 3;
WORD32 cu_y0 = ps_enc_cu->b3_cu_pos_y << 3;
/* CU size in pels */
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
/* CU x co-ordinate w.r.t frame start */
WORD32 ctb_x0_frm = (ps_entropy_ctxt->i4_ctb_x << ps_entropy_ctxt->i1_log2_ctb_size);
WORD32 cu_x0_frm = cu_x0 + ctb_x0_frm;
/* bit postion from where top skip flag is extracted; 1bit per 8 pel */
WORD32 x_pos = ((cu_x0_frm >> 3) & 0x7);
/* bit postion from where left skip flag is extracted; 1bit per 8 pel */
WORD32 y_pos = ((cu_y0 >> 3) & 0x7);
/* top and left skip flags computed based on nbr availability */
UWORD8 *pu1_top_skip_flags = ps_entropy_ctxt->pu1_skip_cu_top + (cu_x0_frm >> 6);
UWORD32 u4_skip_left_flags = ps_entropy_ctxt->u4_skip_cu_left;
/* context incerements based on top and left neigbours */
UWORD32 ctxt_inc = 0;
if(top_avail)
{
WORD32 val;
EXTRACT_BIT(val, pu1_top_skip_flags[0], x_pos);
ctxt_inc += val;
}
if(left_avail)
{
WORD32 val;
EXTRACT_BIT(val, u4_skip_left_flags, y_pos);
ctxt_inc += val;
}
if(CABAC_MODE_COMPUTE_BITS == ps_cabac->e_cabac_op_mode)
{
//ASSERT(ctxt_inc == ps_entropy_ctxt->i4_num_nbr_skip_cus);
ctxt_inc = ps_entropy_ctxt->i4_num_nbr_skip_cus;
ASSERT(ctxt_inc < 3);
ASSERT((WORD32)ctxt_inc <= (top_avail + left_avail));
}
/* encode the skip flag */
error |= ihevce_cabac_encode_bin(ps_cabac, skip_flag, (IHEVC_CAB_SKIP_FLAG + ctxt_inc));
AEV_TRACE("cu_skip_flag", skip_flag, ps_cabac->u4_range);
if(CABAC_MODE_ENCODE_BITS == ps_cabac->e_cabac_op_mode)
{
/* update top and left skip flags only in encode mode */
if(skip_flag)
{
SET_BITS(pu1_top_skip_flags[0], x_pos, (cu_size >> 3));
SET_BITS(u4_skip_left_flags, y_pos, (cu_size >> 3));
}
else
{
CLEAR_BITS(pu1_top_skip_flags[0], x_pos, (cu_size >> 3));
CLEAR_BITS(u4_skip_left_flags, y_pos, (cu_size >> 3));
}
ps_entropy_ctxt->u4_skip_cu_left = u4_skip_left_flags;
}
return (error);
}
/**
******************************************************************************
*
* @brief Entropy encoding of partition mode (Coding Unit syntax)
*
* @par Description
* Binarization process and context modelling of partition mode is done as per
* section 9.3.2.6 (Table 9-34) and se
*
* @param[inout] ps_cabac
* pointer to cabac encoding context (handle)
*
* @param[in] intra
* boolean indicating if current cu is intra cu
*
* @param[in] is_mincu
* boolean indicating if current cu size is equal to mincu
*
* @param[in] amp_enabled
* flag to indicate if AMP(Assymetric motion partition) is enabled at sps level
*
* @param[in] cu_eq_8
* boolean indicating if current cu size is equal to 8
*
* @param[in] part_mode
* partition mode of current CU
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_part_mode(
cab_ctxt_t *ps_cabac,
WORD32 intra,
WORD32 is_mincu,
WORD32 amp_enabled,
WORD32 cu_eq_8,
WORD32 part_mode)
{
/* Binarization depends on intra/inter, is_mincu, amp flag, cbsize == 8 */
WORD32 bins;
WORD32 bin_count, i;
WORD32 error = IHEVCE_SUCCESS;
(void)is_mincu;
(void)amp_enabled;
(void)cu_eq_8;
if(intra)
{
/* sanity checks for intra part mode */
ASSERT(is_mincu);
ASSERT((part_mode == SIZE_NxN) || (part_mode == SIZE_2Nx2N));
bins = (part_mode == SIZE_2Nx2N) ? 1 : 0;
error |= ihevce_cabac_encode_bin(ps_cabac, bins, IHEVC_CAB_PART_MODE);
}
else
{
/* sanity checks for inter part mode....Too many but good to have */
ASSERT((amp_enabled == 0) || (amp_enabled == 1));
ASSERT((is_mincu == 0) || (is_mincu == 1));
ASSERT((cu_eq_8 == 0) || (cu_eq_8 == 1));
ASSERT((part_mode <= SIZE_nRx2N) && (part_mode >= SIZE_2Nx2N));
if(!amp_enabled)
ASSERT(part_mode <= SIZE_NxN);
if(!is_mincu)
ASSERT(part_mode != SIZE_NxN);
if(is_mincu)
ASSERT(part_mode <= SIZE_NxN);
if(cu_eq_8)
ASSERT(part_mode < SIZE_NxN);
if(cu_eq_8)
ASSERT(is_mincu);
/* look up table for bins and number of bins for inter pred mode */
if(!is_mincu)
{
bins = gu1_hevce_inter_part_mode_bins[amp_enabled][part_mode];
}
else
{
bins = gu1_hevce_inter_part_mode_bins_mincu[cu_eq_8][part_mode];
}
bin_count = (bins >> 4) & 0xF;
/* Encode the context model based bins, max of 3 */
for(i = 0; i < MIN(bin_count, 3); i++)
{
//TODO: HM-8.0-dev uses 0 context increment for bin2 (i===2) when amp is enabled
WORD32 ctxt_inc = IHEVC_CAB_PART_MODE + i;
WORD32 bin = (bins >> (3 - i)) & 0x1;
error |= ihevce_cabac_encode_bin(ps_cabac, bin, ctxt_inc);
}
/* Encode the last bin as bypass bin for amp partitions */
if(bin_count == 4)
{
error |= ihevce_cabac_encode_bypass_bin(ps_cabac, (bins & 0x1));
}
}
AEV_TRACE("part_mode", part_mode, ps_cabac->u4_range);
return (error);
}
/**
******************************************************************************
*
* @brief Entropy encoding of merge_idx of inter prediction unit as per sec
* as per sec 9.3.2 Table9-32. (tunary binarization)
*
* @par Description
* trunacted unary binarization is done based on max merge candidates
* First bin is context modelled bin and the rest are coded as bypass
*
* @param[inout] ps_cabac
* pointer to cabac encoding context (handle)
*
* @param[in] merge_idx
* merge idx of the pu to be encoded;
*
* @param[in] max_merge_cand
* maximum merge candidates signalled in the slice header*
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_merge_idx(cab_ctxt_t *ps_cabac, WORD32 merge_idx, WORD32 max_merge_cand)
{
WORD32 ret = IHEVCE_SUCCESS;
WORD32 ctxt_inc = IHEVC_CAB_MERGE_IDX_EXT;
/* sanity checks */
ASSERT((merge_idx >= 0) && (merge_idx < max_merge_cand));
/* encode the merge idx only if required */
if(max_merge_cand > 1)
{
/* encode the context modelled first bin */
ret |= ihevce_cabac_encode_bin(ps_cabac, (merge_idx > 0), ctxt_inc);
/* encode the remaining bins as bypass tunary */
if((max_merge_cand > 2) && (merge_idx > 0))
{
ret |=
ihevce_cabac_encode_tunary_bypass(ps_cabac, (merge_idx - 1), (max_merge_cand - 2));
}
AEV_TRACE("merge_idx", merge_idx, ps_cabac->u4_range);
}
return (ret);
}
/**
******************************************************************************
*
* @brief Entropy encoding of inter_pred_idc for prediction unit of B slice as
* per sec 9.3.2.9 Table9-36
*
* @par Description
* Max of two context modelled bins coded for pu size > 8x4 or 4x8
* one context modelled bin coded for pu size = 8x4 or 4x8; bipred not allowed
* for 8x4 or 4x8.
*
* @param[inout] ps_cabac
* pointer to cabac encoding context (handle)
*
* @param[in] inter_pred_idc
* inter pred mode to be encoded; shall be PRED_L0 or PRED_L1 or PRED_BI
*
* @param[in] cu_depth
* depth of the cu to which current pu belongs (required for context increment)
*
* @param[in] pu_w_plus_pu_h
* required to check if pu_w_plus_pu_h is 12 (8x4PU or 4x8PU)
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_inter_pred_idc(
cab_ctxt_t *ps_cabac, WORD32 inter_pred_idc, WORD32 cu_depth, WORD32 pu_w_plus_pu_h)
{
WORD32 ret = IHEVCE_SUCCESS;
WORD32 ctxt_inc;
ASSERT(inter_pred_idc <= PRED_BI);
/* check if PU is 8x4/4x8 */
if(pu_w_plus_pu_h == 12)
{
/* case of 8x4 or 4x8 where bi_pred is not allowed */
ASSERT((inter_pred_idc == PRED_L0) || (inter_pred_idc == PRED_L1));
ctxt_inc = IHEVC_CAB_INTER_PRED_IDC + 4;
ret |= ihevce_cabac_encode_bin(ps_cabac, inter_pred_idc, ctxt_inc);
}
else
{
/* larger PUs can be encoded as bi_pred/l0/l1 inter_pred_idc */
WORD32 is_bipred = (inter_pred_idc == PRED_BI);
ctxt_inc = IHEVC_CAB_INTER_PRED_IDC + cu_depth;
ret |= ihevce_cabac_encode_bin(ps_cabac, is_bipred, ctxt_inc);
if(!is_bipred)
{
ctxt_inc = IHEVC_CAB_INTER_PRED_IDC + 4;
ret |= ihevce_cabac_encode_bin(ps_cabac, inter_pred_idc, ctxt_inc);
}
}
AEV_TRACE("inter_pred_idc", inter_pred_idc, ps_cabac->u4_range);
return (ret);
}
/**
******************************************************************************
*
* @brief Entropy encoding of refidx for prediction unit; Binarization done as
* tunary code as per sec 9.3.2 Table9-32
*
* @par Description
* First two bins are context modelled while the rest are coded as bypass
*
* @param[inout] ps_cabac
* pointer to cabac encoding context (handle)
*
* @param[in] ref_idx
* ref idx of partition unit
*
* @param[in] active_refs
* max number of active references signalled in slice header
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_refidx(cab_ctxt_t *ps_cabac, WORD32 ref_idx, WORD32 active_refs)
{
/************************************************************/
/* encode ref_idx as tunary binarization Table 9-32 */
/* First 2 bin use context model and rest coded as bypass */
/************************************************************/
WORD32 ret = IHEVCE_SUCCESS;
WORD32 ctxt_inc = IHEVC_CAB_INTER_REF_IDX;
/* sanity checks */
ASSERT((ref_idx >= 0) && (ref_idx < active_refs));
/* encode the ref idx only if required */
if(active_refs > 1)
{
/* encode the context modelled first bin */
ret |= ihevce_cabac_encode_bin(ps_cabac, (ref_idx > 0), ctxt_inc);
if((active_refs > 2) && (ref_idx > 0))
{
/* encode the context modelled second bin */
ctxt_inc++;
ret |= ihevce_cabac_encode_bin(ps_cabac, (ref_idx > 1), ctxt_inc);
}
if((active_refs > 3) && (ref_idx > 1))
{
/* encode remaining bypass bins */
ret |= ihevce_cabac_encode_tunary_bypass(ps_cabac, (ref_idx - 2), (active_refs - 3));
}
AEV_TRACE("ref_idx", ref_idx, ps_cabac->u4_range);
}
return (ret);
}
/**
******************************************************************************
*
* @brief Entropy encoding of mvd for inter pu as per section 7.3.10.2
*
* @par Description
* syntax coded as per section 7.3.10.2 for mvdx and mvdy
* context modeling of abs_mvd_greater0 abs_mvd_greater1 done as per Table 9-32
* binazrization of abs_mvd_minus2 is done as done as EG1 code section 9.3.2.4
*
* @param[inout] ps_cabac
* pointer to cabac encoding context (handle)
*
* @param[in] ps_mvd
* pointer to mvd struct containing mvdx and mvdy
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_mvd(cab_ctxt_t *ps_cabac, mv_t *ps_mvd)
{
WORD32 ret = IHEVCE_SUCCESS;
WORD32 mvd_x = ps_mvd->i2_mvx;
WORD32 mvd_y = ps_mvd->i2_mvy;
WORD32 abs_mvd_x = ABS(mvd_x);
WORD32 abs_mvd_y = ABS(mvd_y);
WORD32 abs_mvd_x_gt0 = abs_mvd_x > 0;
WORD32 abs_mvd_y_gt0 = abs_mvd_y > 0;
WORD32 abs_mvd_x_gt1 = abs_mvd_x > 1;
WORD32 abs_mvd_y_gt1 = abs_mvd_y > 1;
WORD32 ctxt_inc = IHEVC_CAB_MVD_GRT0;
/* encode absmvd_x > 0 */
ret |= ihevce_cabac_encode_bin(ps_cabac, abs_mvd_x_gt0, ctxt_inc);
AEV_TRACE("abs_mvd_greater0_flag[0]", abs_mvd_x_gt0, ps_cabac->u4_range);
/* encode absmvd_y > 0 */
ret |= ihevce_cabac_encode_bin(ps_cabac, abs_mvd_y_gt0, ctxt_inc);
AEV_TRACE("abs_mvd_greater0_flag[1]", abs_mvd_y_gt0, ps_cabac->u4_range);
ctxt_inc = IHEVC_CAB_MVD_GRT1;
/* encode abs_mvd_x > 1 iff (abs_mvd_x > 0) */
if(abs_mvd_x_gt0)
{
ret |= ihevce_cabac_encode_bin(ps_cabac, abs_mvd_x_gt1, ctxt_inc);
AEV_TRACE("abs_mvd_greater1_flag[0]", abs_mvd_x_gt1, ps_cabac->u4_range);
}
/* encode abs_mvd_y > 1 iff (abs_mvd_y > 0) */
if(abs_mvd_y_gt0)
{
ret |= ihevce_cabac_encode_bin(ps_cabac, abs_mvd_y_gt1, ctxt_inc);
AEV_TRACE("abs_mvd_greater1_flag[1]", abs_mvd_y_gt1, ps_cabac->u4_range);
}
/* encode abs_mvd_x - 2 iff (abs_mvd_x > 1) */
if(abs_mvd_x_gt1)
{
ret |= ihevce_cabac_encode_egk(ps_cabac, (abs_mvd_x - 2), 1);
AEV_TRACE("abs_mvd_minus2[0]", (abs_mvd_x - 2), ps_cabac->u4_range);
}
/* encode mvd_x sign iff (abs_mvd_x > 0) */
if(abs_mvd_x_gt0)
{
ret |= ihevce_cabac_encode_bypass_bin(ps_cabac, (mvd_x < 0));
AEV_TRACE("mvd_sign_flag[0]", (mvd_x < 0), ps_cabac->u4_range);
}
/* encode abs_mvd_y - 2 iff (abs_mvd_y > 1) */
if(abs_mvd_y_gt1)
{
ret |= ihevce_cabac_encode_egk(ps_cabac, (abs_mvd_y - 2), 1);
AEV_TRACE("abs_mvd_minus2[1]", (abs_mvd_y - 2), ps_cabac->u4_range);
}
/* encode mvd_y sign iff (abs_mvd_y > 0) */
if(abs_mvd_y_gt0)
{
ret |= ihevce_cabac_encode_bypass_bin(ps_cabac, (mvd_y < 0));
AEV_TRACE("mvd_sign_flag[1]", (mvd_y < 0), ps_cabac->u4_range);
}
return ret;
}
/**
******************************************************************************
*
* @brief Entropy encoding of all syntax elements of inter PUs in a CU
*
* @par Description
* syntax coded as per section 7.3.10.1 for inter prediction unit
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] ps_enc_cu
* pointer to current cu whose inter prediction units are to be encoded
*
* @param[in] cu_depth
* depth of the the current cu in coding tree
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_inter_pu(
entropy_context_t *ps_entropy_ctxt, cu_enc_loop_out_t *ps_enc_cu, WORD32 cu_depth)
{
WORD32 ret = IHEVCE_SUCCESS;
slice_header_t *ps_slice_hdr = ps_entropy_ctxt->ps_slice_hdr;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
pu_t *ps_pu = ps_enc_cu->ps_pu;
WORD32 merge_idx = ps_pu->b3_merge_idx;
WORD32 max_merge_cand = ps_slice_hdr->i1_max_num_merge_cand;
WORD32 ctxt_inc;
if(ps_enc_cu->b1_skip_flag)
{
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
/*PIC_INFO : SKIP CU in frame*/
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_skip_cu++;
ps_entropy_ctxt->ps_pic_level_info->i8_total_pu++;
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_inter_pu[3]++;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_inter_pu[cu_size >> 4]++;
}
/* encode the merge idx for skip cu and return */
ret |= ihevce_cabac_encode_merge_idx(ps_cabac, merge_idx, max_merge_cand);
}
else
{
/* MODE_INTER */
WORD32 part_mode = ps_enc_cu->b3_part_mode;
WORD32 num_parts, i;
num_parts = (part_mode == SIZE_2Nx2N) ? 1 : ((part_mode == SIZE_NxN) ? 4 : 2);
/*PIC_INFO : INTER CU in frame*/
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
ps_entropy_ctxt->ps_pic_level_info->i8_total_inter_cu++;
ps_entropy_ctxt->ps_pic_level_info->i8_total_pu += num_parts;
// clang-format off
if(PART_2Nx2N == part_mode)
{
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_inter_pu[3]++;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_2nx2n_inter_pu[cu_size >> 4]++;
}
else if((PART_2NxN == part_mode) || (PART_Nx2N == part_mode))
{
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_smp_inter_pu[3]++;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_smp_inter_pu[cu_size >> 4]++;
}
else if((PART_2NxnU == part_mode) || (PART_2NxnD == part_mode) ||
(PART_nLx2N == part_mode) || (PART_nRx2N == part_mode))
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_amp_inter_pu[cu_size >> 5]++;
}
else
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_nxn_inter_pu[cu_size >> 5]++;
}
// clang-format on
}
/* encode each pu partition */
for(i = 0; i < num_parts; i++)
{
/* encode the merge flag context modelled bin */
WORD32 merge_flag;
UWORD32 u4_bits_estimated_merge_flag = 0;
ps_pu = ps_enc_cu->ps_pu + i;
/* encode the merge flag context modelled bin */
merge_flag = ps_pu->b1_merge_flag;
u4_bits_estimated_merge_flag = ps_cabac->u4_bits_estimated_q12;
ctxt_inc = IHEVC_CAB_MERGE_FLAG_EXT;
ret |= ihevce_cabac_encode_bin(ps_cabac, merge_flag, ctxt_inc);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
// clang-format off
/*PIC INFO : Populate merge flag */
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_merge_flag =
(ps_cabac->u4_bits_estimated_q12 -
u4_bits_estimated_merge_flag);
// clang-format on
}
AEV_TRACE("merge_flag", merge_flag, ps_cabac->u4_range);
if(merge_flag)
{
merge_idx = ps_pu->b3_merge_idx;
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
ps_entropy_ctxt->ps_pic_level_info->i8_total_merge_pu++;
/* encode the merge idx for the pu */
ret |= ihevce_cabac_encode_merge_idx(ps_cabac, merge_idx, max_merge_cand);
}
else
{
/* encode the inter_pred_idc, ref_idx and mvd */
WORD32 inter_pred_idc = ps_pu->b2_pred_mode;
WORD32 ref_l0_active = ps_slice_hdr->i1_num_ref_idx_l0_active;
WORD32 ref_l1_active = ps_slice_hdr->i1_num_ref_idx_l1_active;
/*PIC_INFO : L0 L1 BI ro r1.. in frame*/
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_non_skipped_inter_pu++;
// clang-format off
if(inter_pred_idc == PRED_L0)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_L0_mode++;
ps_entropy_ctxt->ps_pic_level_info->i8_total_L0_ref_idx[ps_pu->mv.i1_l0_ref_idx]++;
}
else if(inter_pred_idc == PRED_L1)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_L1_mode++;
ps_entropy_ctxt->ps_pic_level_info->i8_total_L1_ref_idx[ps_pu->mv.i1_l1_ref_idx]++;
}
else if(inter_pred_idc == PRED_BI)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_BI_mode++;
if(inter_pred_idc != PRED_L1)
ps_entropy_ctxt->ps_pic_level_info->i8_total_L0_ref_idx[ps_pu->mv.i1_l0_ref_idx]++;
if(inter_pred_idc != PRED_L0)
ps_entropy_ctxt->ps_pic_level_info->i8_total_L1_ref_idx[ps_pu->mv.i1_l1_ref_idx]++;
}
// clang-format on
}
if(ps_slice_hdr->i1_slice_type == BSLICE)
{
/* Encode inter_pred_idc as per sec 9.3.2.9 Table9-36 */
WORD32 pu_w_plus_pu_h;
WORD32 inter_pred_idc = ps_pu->b2_pred_mode;
/* required to check if w+h==12 case */
pu_w_plus_pu_h = ((ps_pu->b4_wd + 1) << 2) + ((ps_pu->b4_ht + 1) << 2);
ret |= ihevce_cabac_encode_inter_pred_idc(
ps_cabac, inter_pred_idc, cu_depth, pu_w_plus_pu_h);
}
else
{
ASSERT(inter_pred_idc == 0);
}
/* Decode ref idx and mvd for L0 (PRED_L0 or PRED_BI) */
if(inter_pred_idc != PRED_L1)
{
UWORD32 u4_bits_estimated_prev_mvd_ref_id;
/* encode L0 ref_idx */
WORD32 ref_idx_l0 = ps_pu->mv.i1_l0_ref_idx;
/*PIC INFO : Populate Ref Indx L0 Bits*/
u4_bits_estimated_prev_mvd_ref_id = ps_cabac->u4_bits_estimated_q12;
ret |= ihevce_cabac_encode_refidx(ps_cabac, ref_idx_l0, ref_l0_active);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
// clang-format off
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_ref_id +=
(ps_cabac->u4_bits_estimated_q12 -
u4_bits_estimated_prev_mvd_ref_id);
// clang-format on
}
/* Encode the mvd for L0 */
/*PIC INFO : Populate MVD Bits*/
u4_bits_estimated_prev_mvd_ref_id = ps_cabac->u4_bits_estimated_q12;
ret |= ihevce_cabac_encode_mvd(ps_cabac, &ps_pu->mv.s_l0_mv);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{ // clang-format off
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_mvd +=
(ps_cabac->u4_bits_estimated_q12 -
u4_bits_estimated_prev_mvd_ref_id);
// clang-format on
}
/* Encode the mvp_l0_flag */
ctxt_inc = IHEVC_CAB_MVP_L0L1;
ret |= ihevce_cabac_encode_bin(ps_cabac, ps_pu->b1_l0_mvp_idx, ctxt_inc);
AEV_TRACE("mvp_l0/l1_flag", ps_pu->b1_l0_mvp_idx, ps_cabac->u4_range);
}
/* Encode ref idx and MVD for L1 (PRED_L1 or PRED_BI) */
if(inter_pred_idc != PRED_L0)
{
/* encode L1 ref_idx */
WORD32 ref_idx_l1 = ps_pu->mv.i1_l1_ref_idx;
UWORD32 u4_bits_estimated_prev_mvd_ref_id;
/*PIC INFO : Populate Ref Indx L1 Bits*/
u4_bits_estimated_prev_mvd_ref_id = ps_cabac->u4_bits_estimated_q12;
ret |= ihevce_cabac_encode_refidx(ps_cabac, ref_idx_l1, ref_l1_active);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{ // clang-format off
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_ref_id +=
(ps_cabac->u4_bits_estimated_q12 -
u4_bits_estimated_prev_mvd_ref_id);
} // clang-format on
/* Check for zero mvd in case of bi_pred */
if(ps_slice_hdr->i1_mvd_l1_zero_flag && inter_pred_idc == PRED_BI)
{
ASSERT(ps_pu->mv.s_l1_mv.i2_mvx == 0);
ASSERT(ps_pu->mv.s_l1_mv.i2_mvy == 0);
}
else
{
/* Encode the mvd for L1 */
/*PIC INFO : Populate MVD Bits*/
u4_bits_estimated_prev_mvd_ref_id = ps_cabac->u4_bits_estimated_q12;
/* Encode the mvd for L1 */
ret |= ihevce_cabac_encode_mvd(ps_cabac, &ps_pu->mv.s_l1_mv);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_mvd +=
(ps_cabac->u4_bits_estimated_q12 -
u4_bits_estimated_prev_mvd_ref_id);
}
}
/* Encode the mvp_l1_flag */
ctxt_inc = IHEVC_CAB_MVP_L0L1;
ret |= ihevce_cabac_encode_bin(ps_cabac, ps_pu->b1_l1_mvp_idx, ctxt_inc);
AEV_TRACE("mvp_l0/l1_flag", ps_pu->b1_l1_mvp_idx, ps_cabac->u4_range);
}
}
}
}
return ret;
}
/**
******************************************************************************
*
* @brief Entropy encoding of coding unit (Coding Unit syntax)
*
* @par Description
* Entropy encode of coding unit (Coding Unit syntax) as per section:7.3.9.1
* General Coding unit syntax
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] ps_enc_cu
* pointer to current cu whose entropy encode is done
*
* @param[in] cu_depth
* depth of the the current cu in coding tree
*
* @param[in] top_avail
* top availabilty flag for current cu (boolean)
*
* @param[in] left_avail
* left availabilty flag for current cu (boolean)
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_coding_unit(
entropy_context_t *ps_entropy_ctxt,
cu_enc_loop_out_t *ps_enc_cu,
WORD32 cu_depth,
WORD32 top_avail,
WORD32 left_avail)
{
WORD32 ret = IHEVCE_SUCCESS;
sps_t *ps_sps = ps_entropy_ctxt->ps_sps;
pps_t *ps_pps = ps_entropy_ctxt->ps_pps;
slice_header_t *ps_slice_hdr = ps_entropy_ctxt->ps_slice_hdr;
WORD32 skip_flag = 0;
WORD32 no_res_flag = 0;
/* CU top left co-ordinates w.r.t ctb */
WORD32 cu_x0 = ps_enc_cu->b3_cu_pos_x << 3;
WORD32 cu_y0 = ps_enc_cu->b3_cu_pos_y << 3;
/* CU size in pels */
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
WORD32 log2_cb_size;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
UWORD32 u4_header_bits_temp = ps_cabac->u4_bits_estimated_q12;
(void)cu_depth;
(void)top_avail;
(void)left_avail;
/* Sanity checks */
ASSERT((cu_x0 + cu_size) <= (1 << ps_entropy_ctxt->i1_log2_ctb_size));
ASSERT((cu_y0 + cu_size) <= (1 << ps_entropy_ctxt->i1_log2_ctb_size));
/* code tq bypass flag */
ASSERT(ps_pps->i1_transquant_bypass_enable_flag == 0);
/* log2_cb_size based on cu size */
GETRANGE(log2_cb_size, cu_size);
log2_cb_size -= 1;
if(ps_pps->i1_transquant_bypass_enable_flag)
{
ihevce_cabac_encode_bin(
ps_cabac, ps_enc_cu->b1_tq_bypass_flag, IHEVC_CAB_CU_TQ_BYPASS_FLAG);
AEV_TRACE("cu_transquant_bypass_flag", ps_enc_cu->b1_tq_bypass_flag, ps_cabac->u4_range);
}
/* code the skip flag for inter slices */
if(ps_slice_hdr->i1_slice_type != ISLICE)
{
skip_flag = ps_enc_cu->b1_skip_flag;
ret |= ihevce_cabac_encode_skip_flag(ps_entropy_ctxt, ps_enc_cu, top_avail, left_avail);
}
/*PIC_INFO : Total CU in frame based on cu size */
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
// clang-format off
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_cu_based_on_size[3]++;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_cu_based_on_size[cu_size >> 4]++;
// clang-format on
}
if(skip_flag)
{
/* encode merge idx for the skip cu */
ret |= ihevce_cabac_encode_inter_pu(ps_entropy_ctxt, ps_enc_cu, cu_depth);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
/*PIC INFO: Populated non-coded TUs in CU*/
ps_entropy_ctxt->ps_pic_level_info->i8_total_non_coded_tu +=
ps_enc_cu->u2_num_tus_in_cu;
// clang-format off
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[3] +=
ps_enc_cu->u2_num_tus_in_cu;
else if(cu_size == 32)
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[3] +=
ps_enc_cu->u2_num_tus_in_cu;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[cu_size >> 3] +=
ps_enc_cu->u2_num_tus_in_cu;
// clang-format on
/*PIC INFO: Populate cu header bits*/
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_cu_hdr_bits +=
(ps_cabac->u4_bits_estimated_q12 - u4_header_bits_temp);
}
}
else
{
WORD32 pred_mode = PRED_MODE_INTRA;
WORD32 part_mode = ps_enc_cu->b3_part_mode;
WORD32 pcm_flag = ps_enc_cu->b1_pcm_flag;
WORD32 is_mincu;
WORD32 is_intra;
is_mincu = (cu_size == (1 << ps_sps->i1_log2_min_coding_block_size));
/* encode pred mode flag for inter slice */
if(ps_slice_hdr->i1_slice_type != ISLICE)
{
pred_mode = ps_enc_cu->b1_pred_mode_flag;
ret |= ihevce_cabac_encode_bin(ps_cabac, pred_mode, IHEVC_CAB_PRED_MODE);
AEV_TRACE("pred_mode_flag", pred_mode, ps_cabac->u4_range);
}
is_intra = (PRED_MODE_INTRA == pred_mode);
/* encode partition mode for inter pred or smallest intra pred cu */
if((!is_intra) || is_mincu)
{
WORD32 amp_enabled = ps_sps->i1_amp_enabled_flag;
WORD32 cusize_8 = (cu_size == 8);
ret |= ihevce_cabac_encode_part_mode(
ps_cabac, is_intra, is_mincu, amp_enabled, cusize_8, part_mode);
}
else
{
ASSERT(part_mode == SIZE_2Nx2N);
}
/* encode intra / inter pu modes of the current CU */
if(is_intra)
{
/* NOTE: I_PCM not supported in encoder */
ASSERT(0 == pcm_flag);
ASSERT(0 == ps_sps->i1_pcm_enabled_flag);
ret |= ihevce_cabac_encode_intra_pu(ps_entropy_ctxt, part_mode, ps_enc_cu);
}
else
{
ret |= ihevce_cabac_encode_inter_pu(ps_entropy_ctxt, ps_enc_cu, cu_depth);
}
/* encode no residue syntax flag and transform tree conditionally */
if(!pcm_flag)
{
pu_t *ps_pu = &ps_enc_cu->ps_pu[0];
WORD32 merge_cu;
/* Encode residue syntax flag for inter cus not merged as 2Nx2N */
if(!is_intra)
merge_cu = (part_mode == PART_2Nx2N) && ps_pu->b1_merge_flag;
if(!is_intra && !merge_cu)
{
no_res_flag = ps_enc_cu->b1_no_residual_syntax_flag;
#if 1 /* HACK FOR COMPLIANCE WITH HM REFERENCE DECODER */
/*********************************************************/
/* currently the HM decoder expects qtroot cbf instead of */
/* no_residue_flag which has opposite meaning */
/* This will be fixed once the software / spec is fixed */
/*********************************************************/
ret |= ihevce_cabac_encode_bin(ps_cabac, !no_res_flag, IHEVC_CAB_NORES_IDX);
AEV_TRACE("no_residual_syntax_flag (HACKY)", !no_res_flag, ps_cabac->u4_range);
#else
ret |= ihevce_cabac_encode_bin(ps_cabac, no_res_flag, IHEVC_CAB_NORES_IDX);
AEV_TRACE("no_residual_syntax_flag", no_res_flag, ps_cabac->u4_range);
#endif
}
/*initialize header bits*/
ps_cabac->u4_header_bits_estimated_q12 = ps_cabac->u4_bits_estimated_q12;
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{ // clang-format off
/*PIC INFO: Populate cu header bits*/
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_cu_hdr_bits +=
(ps_cabac->u4_bits_estimated_q12 - u4_header_bits_temp);
} // clang-format on
ps_cabac->u4_true_tu_split_flag_q12 = 0;
/* encode transform tree if no_residue_flag is 0 */
if(!no_res_flag)
{
ps_entropy_ctxt->i4_tu_idx = 0;
ret |= ihevce_encode_transform_tree(
ps_entropy_ctxt, cu_x0, cu_y0, log2_cb_size, 0, 0, ps_enc_cu);
}
else
{
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
/*PIC INFO: Populated non-coded TUs in CU*/
ps_entropy_ctxt->ps_pic_level_info->i8_total_non_coded_tu +=
ps_enc_cu->u2_num_tus_in_cu;
// clang-format off
if(cu_size == 64)
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[3] +=
ps_enc_cu->u2_num_tus_in_cu;
else if(cu_size == 32)
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[3] +=
ps_enc_cu->u2_num_tus_in_cu;
else
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu_based_on_size[cu_size >> 3] +=
ps_enc_cu->u2_num_tus_in_cu;
// clang-format on
}
}
ps_cabac->u4_cbf_bits_q12 = ps_cabac->u4_bits_estimated_q12 -
ps_cabac->u4_header_bits_estimated_q12 -
ps_cabac->u4_true_tu_split_flag_q12;
}
}
/*duplicate the qp values for 8x8 CU array to maintain neighbour qp*/
if(CABAC_MODE_ENCODE_BITS == ps_entropy_ctxt->s_cabac_ctxt.e_cabac_op_mode)
{
WORD32 i, j;
WORD32 cur_cu_offset, cur_qp, qp_left, qp_top;
WORD32 is_last_blk_in_qg;
/* CU x co-ordinate w.r.t frame start */
WORD32 ctb_x0_frm = (ps_entropy_ctxt->i4_ctb_x << ps_entropy_ctxt->i1_log2_ctb_size);
WORD32 cu_x0_frm = cu_x0 + ctb_x0_frm;
/* CU y co-ordinate w.r.t frame start */
WORD32 ctb_y0_frm = (ps_entropy_ctxt->i4_ctb_y << ps_entropy_ctxt->i1_log2_ctb_size);
WORD32 cu_y0_frm = cu_y0 + ctb_y0_frm;
WORD32 pic_width = ps_sps->i2_pic_width_in_luma_samples;
WORD32 pic_height = ps_sps->i2_pic_height_in_luma_samples;
/* Added code for handling the QP neighbour population depending
on the diff_cu_qp_delta_depth: Lokesh */
/* is_last_blk_in_qg variables is to find if the coding block is the last CU in the Quantization group
3 - i1_diff_cu_qp_delta_depth is done as the cu_pos_x and cu_pos_y are in terms of 8x8 positions in the CTB: Lokesh*/
WORD32 log2_min_cu_qp_delta_size =
ps_entropy_ctxt->i1_log2_ctb_size - ps_entropy_ctxt->ps_pps->i1_diff_cu_qp_delta_depth;
UWORD32 min_cu_qp_delta_size = 1 << log2_min_cu_qp_delta_size;
WORD32 block_addr_align = 15 << (log2_min_cu_qp_delta_size - 3);
ps_entropy_ctxt->i4_qg_pos_x = ps_enc_cu->b3_cu_pos_x & block_addr_align;
ps_entropy_ctxt->i4_qg_pos_y = ps_enc_cu->b3_cu_pos_y & block_addr_align;
/* Condition for detecting last cu in a qp group. */
/* Case 1: Current cu position + size exceed or meets the next qp group start location */
/* Case 2: Current cu position + size hits the incomplete ctb boundary in atleast one */
/* direction and the qp grp limit in other direction */
/* case 1 */
is_last_blk_in_qg =
((cu_x0 + cu_size) >=
((ps_entropy_ctxt->i4_qg_pos_x << 3) + (WORD32)min_cu_qp_delta_size) &&
(cu_y0 + cu_size) >=
((ps_entropy_ctxt->i4_qg_pos_y << 3) + (WORD32)min_cu_qp_delta_size));
/* case 2 : x direction incomplete ctb */
if((cu_x0_frm + cu_size) >= pic_width)
{
is_last_blk_in_qg |=
((cu_y0 + cu_size) >=
((ps_entropy_ctxt->i4_qg_pos_y << 3) + (WORD32)min_cu_qp_delta_size));
}
/* case 2 : y direction incomplete ctb */
if((cu_y0_frm + cu_size) >= pic_height)
{
is_last_blk_in_qg |=
((cu_x0 + cu_size) >=
((ps_entropy_ctxt->i4_qg_pos_x << 3) + (WORD32)min_cu_qp_delta_size));
}
cur_cu_offset = ps_enc_cu->b3_cu_pos_x + (ps_enc_cu->b3_cu_pos_y * 8);
if((ps_entropy_ctxt->i4_is_cu_cbf_zero || no_res_flag || skip_flag) &&
((ps_entropy_ctxt->i1_encode_qp_delta)))
{
{ // clang-format off
/*it should remember average of qp_top and qp_left*/
if(ps_entropy_ctxt->i4_qg_pos_x > 0)
{
qp_left =
ps_entropy_ctxt->ai4_8x8_cu_qp[(ps_entropy_ctxt->i4_qg_pos_x - 1) +
(ps_entropy_ctxt->i4_qg_pos_y * 8)];
}
if(ps_entropy_ctxt->i4_qg_pos_y > 0)
{
qp_top =
ps_entropy_ctxt->ai4_8x8_cu_qp[ps_entropy_ctxt->i4_qg_pos_x +
(ps_entropy_ctxt->i4_qg_pos_y - 1) *
8];
} // clang-format on
if(ps_entropy_ctxt->i4_qg_pos_x == 0)
{
/*previous coded Qp*/
qp_left = ps_entropy_ctxt->i1_cur_qp;
}
if(ps_entropy_ctxt->i4_qg_pos_y == 0)
{
/*previous coded Qp*/
qp_top = ps_entropy_ctxt->i1_cur_qp;
}
cur_qp = (qp_top + qp_left + 1) >> 1;
/*In case of skip or zero cbf CU the previous qp used has to be updated*/
if(is_last_blk_in_qg)
ps_entropy_ctxt->i1_cur_qp = cur_qp;
}
}
else
{
cur_qp = (WORD32)ps_enc_cu->ps_enc_tu->s_tu.b7_qp;
}
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
WORD32 temp = 0;
/*PIC_INFO: Accumalate average qp, min qp and max qp*/
ps_entropy_ctxt->ps_pic_level_info->i8_total_qp += cur_qp;
if(cu_size == 64)
temp = 6;
else if(cu_size == 32)
temp = 4;
else if(cu_size == 16)
temp = 2;
else if(cu_size == 8)
temp = 0;
ps_entropy_ctxt->ps_pic_level_info->i8_total_qp_min_cu += (cur_qp * (1 << temp));
if(cur_qp < ps_entropy_ctxt->ps_pic_level_info->i4_min_qp)
ps_entropy_ctxt->ps_pic_level_info->i4_min_qp = cur_qp;
if(cur_qp > ps_entropy_ctxt->ps_pic_level_info->i4_max_qp)
ps_entropy_ctxt->ps_pic_level_info->i4_max_qp = cur_qp;
}
for(i = 0; i < (WORD32)ps_enc_cu->b4_cu_size; i++)
{
for(j = 0; j < (WORD32)ps_enc_cu->b4_cu_size; j++)
{
ps_entropy_ctxt->ai4_8x8_cu_qp[cur_cu_offset + (i * 8) + j] = cur_qp;
}
}
ps_entropy_ctxt->i4_is_cu_cbf_zero = 1;
}
return ret;
}
/**
******************************************************************************
*
* @brief Entropy encoding of SAO related syntax elements as per sec 7.3.8.3
*
* @par Description
* Encoding of sao related syntax elements at ctb level.
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] ps_ctb_enc_loop_out
* pointer to ctb level output structure from enc loop
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_cabac_encode_sao(
entropy_context_t *ps_entropy_ctxt, ctb_enc_loop_out_t *ps_ctb_enc_loop_out)
{
WORD32 error = IHEVCE_SUCCESS;
sao_enc_t *ps_sao;
nbr_avail_flags_t *ps_ctb_nbr_avail_flags;
slice_header_t *ps_slice_hdr = ps_entropy_ctxt->ps_slice_hdr;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
UWORD8 u1_left_avail, u1_top_avail;
ps_ctb_nbr_avail_flags = &ps_ctb_enc_loop_out->s_ctb_nbr_avail_flags;
ps_sao = &ps_ctb_enc_loop_out->s_sao;
ASSERT(ps_sao->b1_sao_merge_left_flag < 2);
u1_left_avail = ps_ctb_nbr_avail_flags->u1_left_avail;
u1_top_avail = ps_ctb_nbr_avail_flags->u1_top_avail;
if(u1_left_avail == 1)
{
/*Encode the sao_merge_left_flag as FL as per table 9-32*/
error |=
ihevce_cabac_encode_bin(ps_cabac, ps_sao->b1_sao_merge_left_flag, IHEVC_CAB_SAO_MERGE);
AEV_TRACE("sao_merge_flag", ps_sao->b1_sao_merge_left_flag, ps_cabac->u4_range);
}
if((u1_top_avail == 1) && (!ps_sao->b1_sao_merge_left_flag))
{
/*Encode the sao_merge_up_flag as FL as per table 9-32*/
error |=
ihevce_cabac_encode_bin(ps_cabac, ps_sao->b1_sao_merge_up_flag, IHEVC_CAB_SAO_MERGE);
AEV_TRACE("sao_merge_flag", ps_sao->b1_sao_merge_up_flag, ps_cabac->u4_range);
}
if((!ps_sao->b1_sao_merge_left_flag) && (!ps_sao->b1_sao_merge_up_flag))
{
WORD32 c_idx;
WORD32 sao_type_idx = ps_sao->b3_y_type_idx;
/*Run a loop for y,cb and cr to encode the type idx for luma and chroma*/
for(c_idx = 0; c_idx < 3; c_idx++)
{
if((ps_slice_hdr->i1_slice_sao_luma_flag && c_idx == 0) ||
(ps_slice_hdr->i1_slice_sao_chroma_flag && c_idx > 0))
{
WORD32 ctxt_bin;
/**************************************************************************/
/* encode the sao_type_idx as per Table 9-33 */
/* First bin is context model based prefix : 1 if sao_type_idx > 0 else 0 */
/* Second bin is coded as bypass bin if sao_type_ide > 0 */
/**************************************************************************/
if(c_idx < 2)
{
WORD32 sao_type_idx_temp;
ASSERT(ps_sao->b3_cb_type_idx == ps_sao->b3_cr_type_idx);
sao_type_idx = c_idx ? ps_sao->b3_cb_type_idx : ps_sao->b3_y_type_idx;
ctxt_bin = sao_type_idx ? 1 : 0;
if(sao_type_idx > 1)
{
sao_type_idx_temp = 2;
}
else
{
sao_type_idx_temp = sao_type_idx;
}
ASSERT(sao_type_idx_temp < 3);
/*Encode the first bin as context bin as per table 9-37*/
error |= ihevce_cabac_encode_bin(ps_cabac, ctxt_bin, IHEVC_CAB_SAO_TYPE);
if(sao_type_idx_temp)
{
/*Binarisation for sao_type_idx is TR(truncated rice) process as per
* table 9-32 with cMax=2 and cRiceParam=0
*/
/* Encode the second bin as bypass bin as per below table*/
/*
|Symbol | Prefix |Prefix length |Prefix bins|
| 0 | 0 | 1 | 0 |
| 1 | 1 | 2 | 10 |
| 2 | 2 | 2 | 11 |
Since cRiceParam=0, there is no suffix code
*/
error |= ihevce_cabac_encode_bypass_bin(ps_cabac, sao_type_idx_temp - 1);
}
AEV_TRACE("sao_type_idx", sao_type_idx_temp, ps_cabac->u4_range);
}
if(sao_type_idx != 0)
{
WORD32 i;
UWORD8 u1_bit_depth = ps_entropy_ctxt->ps_sps->i1_bit_depth_luma_minus8 + 8;
WORD8 *sao_offset;
WORD32 sao_band_position;
WORD32 c_max = (1 << (MIN(u1_bit_depth, 10) - 5)) -
1; //( 1 << (MIN(BIT_DEPTH, 10) - 5)) - 1;
if(c_idx == 0)
{
//sao_offset[0] = ps_sao->b4_y_offset_1;
//sao_offset[1] = ps_sao->b4_y_offset_2;
//sao_offset[2] = ps_sao->b4_y_offset_3;
//sao_offset[3] = ps_sao->b4_y_offset_4;
sao_offset = &ps_sao->u1_y_offset[1];
sao_band_position = ps_sao->b5_y_band_pos;
}
else if(c_idx == 1)
{
//sao_offset[0] = ps_sao->b4_cb_offset_1;
//sao_offset[1] = ps_sao->b4_cb_offset_2;
//sao_offset[2] = ps_sao->b4_cb_offset_3;
//sao_offset[3] = ps_sao->b4_cb_offset_4;
sao_offset = &ps_sao->u1_cb_offset[1];
sao_band_position = ps_sao->b5_cb_band_pos;
}
else
{
//sao_offset[0] = ps_sao->b4_cr_offset_1;
//sao_offset[1] = ps_sao->b4_cr_offset_2;
//sao_offset[2] = ps_sao->b4_cr_offset_3;
//sao_offset[3] = ps_sao->b4_cr_offset_4;
sao_offset = &ps_sao->u1_cr_offset[1];
sao_band_position = ps_sao->b5_cr_band_pos;
}
for(i = 0; i < 4; i++)
{
/*Encode the sao offset value as tunary bypass*/
error |=
ihevce_cabac_encode_tunary_bypass(ps_cabac, abs(sao_offset[i]), c_max);
AEV_TRACE("sao_offset_abs", abs(sao_offset[i]), ps_cabac->u4_range);
}
/*Band offset case*/
if(sao_type_idx == 1)
{
for(i = 0; i < 4; i++)
{
if(sao_offset[i] != 0)
{
/*Encode the sao offset sign as FL as per table 9-32*/
error |= ihevce_cabac_encode_bypass_bin(
ps_cabac,
(abs(sao_offset[i]) + sao_offset[i] == 0)); //,
//IHEVC_CAB_SAO_MERGE
//);
AEV_TRACE(
"sao_offset_sign",
(abs(sao_offset[i]) + sao_offset[i] == 0),
ps_cabac->u4_range);
}
}
/*Encode the sao band position as FL as per table 9-32*/
error |= ihevce_cabac_encode_bypass_bins(ps_cabac, sao_band_position, 5);
AEV_TRACE("sao_band_position", sao_band_position, ps_cabac->u4_range);
}
else
{
/*Encode the sao edge offset class for luma and chroma as FL as per table 9-32*/
if(c_idx == 0)
{
error |= ihevce_cabac_encode_bypass_bins(
ps_cabac, (ps_sao->b3_y_type_idx - 2), 2);
AEV_TRACE(
"sao_eo_class", (ps_sao->b3_y_type_idx - 2), ps_cabac->u4_range);
}
if(c_idx == 1)
{
ASSERT(ps_sao->b3_cb_type_idx == ps_sao->b3_cr_type_idx);
error |= ihevce_cabac_encode_bypass_bins(
ps_cabac, (ps_sao->b3_cb_type_idx - 2), 2);
AEV_TRACE(
"sao_eo_class", (ps_sao->b3_cb_type_idx - 2), ps_cabac->u4_range);
}
}
}
}
}
}
return (error);
}
/**
******************************************************************************
*
* @brief Encodes a coding quad tree (QuadTree syntax) as per section 7.3.8
*
* @par Description
* Entropy encode of coding quad tree based on cu split flags of ctb as per
* section:7.3.8
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @param[in] x0_frm
* x co-ordinate of current cu node of coding tree
*
* @param[in] y0_frm
* y co-ordinate of current cu node of coding tree
*
* @param[in] log2_cb_size
* current cu node block size
*
* @param[in] ct_depth
* depth of current cu node w.r.t ctb
*
* @param[in] ps_ctb
* pointer to current ctb structure
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_encode_coding_quadtree(
entropy_context_t *ps_entropy_ctxt,
WORD32 x0_frm,
WORD32 y0_frm,
WORD32 log2_cb_size,
WORD32 ct_depth,
ctb_enc_loop_out_t *ps_ctb,
ihevce_tile_params_t *ps_tile_params)
{
WORD32 ret = IHEVCE_SUCCESS;
sps_t *ps_sps = ps_entropy_ctxt->ps_sps;
pps_t *ps_pps = ps_entropy_ctxt->ps_pps;
WORD32 split_cu_flag;
WORD32 cu_idx = ps_entropy_ctxt->i4_cu_idx;
cu_enc_loop_out_t *ps_enc_cu = ps_ctb->ps_enc_cu + cu_idx;
/* CU size in pels */
WORD32 cu_size = ps_enc_cu->b4_cu_size << 3;
WORD32 pic_width = ps_tile_params->i4_curr_tile_width;
WORD32 pic_height = ps_tile_params->i4_curr_tile_height;
WORD32 log2_min_cb_size = ps_sps->i1_log2_min_coding_block_size;
WORD32 ctb_size = (1 << (log2_cb_size + ct_depth));
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
/* top row cu depth stored for frm_width (1byte per mincusize=8) */
UWORD8 *pu1_cu_depth_top = ps_entropy_ctxt->pu1_cu_depth_top;
/* left cu depth stored for one ctb column (1byte per mincusize=8) */
UWORD8 *pu1_cu_depth_left = &ps_entropy_ctxt->au1_cu_depth_left[0];
/* calculation of top and left nbr availability */
WORD32 top_avail;
WORD32 left_avail;
/* top and left cu within ctb or outside ctb boundary */
left_avail = (x0_frm & (ctb_size - 1)) ? 1 : ps_ctb->s_ctb_nbr_avail_flags.u1_left_avail;
top_avail = (y0_frm & (ctb_size - 1)) ? 1 : ps_ctb->s_ctb_nbr_avail_flags.u1_top_avail;
/* Sanity checks */
ASSERT(ct_depth <= 3);
ASSERT((cu_idx >= 0) && (cu_idx < ps_ctb->u1_num_cus_in_ctb));
ASSERT(cu_size >= (1 << log2_min_cb_size));
ASSERT(((ps_enc_cu->b3_cu_pos_x << 3) + cu_size) <= (UWORD32)ctb_size);
ASSERT(((ps_enc_cu->b3_cu_pos_y << 3) + cu_size) <= (UWORD32)ctb_size);
/* Encode cu split flags based on following conditions; See section 7.3.8*/
if(((x0_frm + (1 << log2_cb_size)) <= pic_width) &&
((y0_frm + (1 << log2_cb_size)) <= pic_height) && (log2_cb_size > log2_min_cb_size) &&
(ps_entropy_ctxt->i1_ctb_num_pcm_blks == 0))
{
/* encode the split cu flag */
WORD32 ctxt_inc = IHEVC_CAB_SPLIT_CU_FLAG;
UWORD32 u4_bits_estimated_prev;
/* Context increment for skip flag as per Table 9-38 */
if(top_avail)
{
ctxt_inc += (pu1_cu_depth_top[x0_frm >> 3] > ct_depth);
}
if(left_avail)
{
ctxt_inc += (pu1_cu_depth_left[(y0_frm >> 3) & 0x7] > ct_depth);
}
/* split if actual cu size is smaller than target cu size */
split_cu_flag = cu_size < (1 << log2_cb_size);
u4_bits_estimated_prev = ps_cabac->u4_bits_estimated_q12;
ret |= ihevce_cabac_encode_bin(ps_cabac, split_cu_flag, ctxt_inc);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{ // clang-format off
/*PIC INFO : populate cu split flag*/
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_split_cu_flag +=
(ps_cabac->u4_bits_estimated_q12 - u4_bits_estimated_prev);
} // clang-format on
AEV_TRACE("split_cu_flag", split_cu_flag, ps_cabac->u4_range);
if(split_cu_flag == 0)
{
AEV_TRACE("split_cu_flag : X0", (x0_frm >> 6) << 6, ps_cabac->u4_range);
AEV_TRACE("split_cu_flag : Y0", (y0_frm >> 6) << 6, ps_cabac->u4_range);
}
}
else
{
/*********************************************************************/
/* split cu is implicitly derived as 1 in frame/slice boundary case */
/* else split cu is implicitly derived as 0 if mincu size is reached */
/*********************************************************************/
if(log2_cb_size > ps_sps->i1_log2_min_coding_block_size)
split_cu_flag = 1;
else
split_cu_flag = 0;
}
/************************************************************************/
/* Reset qp delata coded flag appropriately so as to signal qp rightly */
/* during transform coding */
/************************************************************************/
if((ps_pps->i1_cu_qp_delta_enabled_flag) && (ct_depth <= (ps_pps->i1_diff_cu_qp_delta_depth)))
{
ps_entropy_ctxt->i1_encode_qp_delta = 1;
}
/*else
{
ps_entropy_ctxt->i1_encode_qp_delta = 0;
}*/
if(split_cu_flag)
{
/* recurse quad tree till a leaf node is reached */
WORD32 x1_frm = x0_frm + ((1 << log2_cb_size) >> 1);
WORD32 y1_frm = y0_frm + ((1 << log2_cb_size) >> 1);
/* node0 of quad tree */
ret |= ihevce_encode_coding_quadtree(
ps_entropy_ctxt, x0_frm, y0_frm, log2_cb_size - 1, ct_depth + 1, ps_ctb, ps_tile_params);
if(x1_frm < pic_width)
{ /* node1 of quad tree */
ret |= ihevce_encode_coding_quadtree(
ps_entropy_ctxt,
x1_frm,
y0_frm,
log2_cb_size - 1,
ct_depth + 1,
ps_ctb,
ps_tile_params);
}
if(y1_frm < pic_height)
{
/* node2 of quad tree */
ret |= ihevce_encode_coding_quadtree(
ps_entropy_ctxt,
x0_frm,
y1_frm,
log2_cb_size - 1,
ct_depth + 1,
ps_ctb,
ps_tile_params);
}
if((x1_frm < pic_width) && (y1_frm < pic_height))
{
/* node3 of quad tree */
ret |= ihevce_encode_coding_quadtree(
ps_entropy_ctxt,
x1_frm,
y1_frm,
log2_cb_size - 1,
ct_depth + 1,
ps_ctb,
ps_tile_params);
}
}
else
{
/* leaf node is reached! Encode the CU */
WORD32 i;
/* sanity checks */
ASSERT(ps_entropy_ctxt->i1_ctb_num_pcm_blks == 0);
if(ps_entropy_ctxt->i1_ctb_num_pcm_blks == 0)
{
UWORD32 u4_bits_eztimated = ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12;
/* Encode a non-PCM CU */
/*PCM INFO: populate total TUs*/
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
ps_entropy_ctxt->ps_pic_level_info->i8_total_tu += ps_enc_cu->u2_num_tus_in_cu;
}
ret |= ihevce_cabac_encode_coding_unit(
ps_entropy_ctxt, ps_enc_cu, ct_depth, top_avail, left_avail);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
// clang-format off
if(PRED_MODE_INTRA == ps_enc_cu->b1_pred_mode_flag)
{
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_intra +=
(ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12 -
u4_bits_eztimated);
}
else
{
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_inter +=
(ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12 -
u4_bits_eztimated);
}
// clang-format on
}
}
else
{ //TODO: //PCM not supported in this encoder
}
/* update cu_idx, left and top arrays for cudepth after encoding cu */
ps_entropy_ctxt->i4_cu_idx++;
for(i = 0; i < (cu_size >> 3); i++)
{
pu1_cu_depth_top[(x0_frm >> 3) + i] = ct_depth;
pu1_cu_depth_left[((y0_frm >> 3) & 0x7) + i] = ct_depth;
}
}
return ret;
}
/**
******************************************************************************
*
* @brief Encodes slice data (General Slice syntax) as per section 7.3.6.1
*
* @par Description
* Entropy encode of all ctbs in a slice as per section 7.3.6.1
*
* @param[inout] ps_entropy_ctxt
* pointer to entropy context (handle)
*
* @return success or failure error code
*
******************************************************************************
*/
WORD32 ihevce_encode_slice_data(
entropy_context_t *ps_entropy_ctxt,
ihevce_tile_params_t *ps_tile_params,
WORD32 *pi4_end_of_slice_flag)
{
WORD32 ret = IHEVCE_SUCCESS;
WORD32 end_of_slice_seg_flag = 0;
sps_t *ps_sps = ps_entropy_ctxt->ps_sps;
pps_t *ps_pps = ps_entropy_ctxt->ps_pps;
slice_header_t *ps_slice_hdr = ps_entropy_ctxt->ps_slice_hdr;
cab_ctxt_t *ps_cabac = &ps_entropy_ctxt->s_cabac_ctxt;
/* State of previous CTB before it's terminate bin is encoded */
cab_ctxt_t s_cabac_prev_ctb;
/* State after current CTB's encoding is complete but before
the termintate bin encoding */
cab_ctxt_t s_cabac_after_ctb;
/* Storing the last 4 bytes before adding terminate bin
as these 4 bytes might get corrupted while encoding terminate bin */
UWORD32 u4_prev_ctb_temp, u4_cur_ctb_temp;
WORD8 i1_last_cu_qp = 0;
bitstrm_t *ps_bit_strm = &ps_entropy_ctxt->s_bit_strm;
WORD32 log2_ctb_size, ctb_size;
//WORD32 pic_width = ps_sps->i2_pic_width_in_luma_samples;
//WORD32 pic_height = ps_sps->i2_pic_height_in_luma_samples;
WORD32 pic_width = ps_tile_params->i4_curr_tile_width;
WORD32 pic_height = ps_tile_params->i4_curr_tile_height;
WORD32 num_ctb_in_row;
WORD32 i4_curr_ctb_x, i4_curr_ctb_y;
UWORD32 u4_slice_seg_hdr_size = (UWORD32)ps_entropy_ctxt->i4_slice_seg_len;
UWORD32 u4_slice_start_offset = ps_bit_strm->u4_strm_buf_offset - u4_slice_seg_hdr_size;
WORD32 ctb_slice_address = ps_slice_hdr->i2_slice_address;
WORD32 slice_qp = ps_slice_hdr->i1_slice_qp_delta + ps_pps->i1_pic_init_qp;
WORD32 cabac_init_idc;
WORD32 x0_frm, y0_frm;
ctb_enc_loop_out_t *ps_first_ctb; // Points to first CTB of ctb-row
ctb_enc_loop_out_t *ps_ctb;
WORD32 ctb_ctr = 0; //count ctb encoded in a ctb-row
ihevce_sys_api_t *ps_sys_api = (ihevce_sys_api_t *)ps_entropy_ctxt->pv_sys_api;
/* Structure to backup pic info in case we need to revert back to pervious
CTB when i4_slice_segment_mode is 2 */
s_pic_level_acc_info_t s_pic_level_info_backup; // info before
/* Initialize the CTB size from sps parameters */
log2_ctb_size =
ps_sps->i1_log2_min_coding_block_size + ps_sps->i1_log2_diff_max_min_coding_block_size;
ctb_size = (1 << log2_ctb_size);
/* sanity checks */
ASSERT((log2_ctb_size >= 3) && (log2_ctb_size <= 6));
ps_entropy_ctxt->i1_log2_ctb_size = (WORD8)log2_ctb_size;
/* Initiallise before starting slice. For single slice case both
x and y will be set to zero */
ps_entropy_ctxt->i4_ctb_x = ps_entropy_ctxt->i4_next_slice_seg_x;
ps_entropy_ctxt->i4_ctb_y = ps_entropy_ctxt->i4_next_slice_seg_y;
num_ctb_in_row = (ps_sps->i2_pic_width_in_luma_samples + ctb_size - 1) >> log2_ctb_size;
/* initialize the cabac init idc based on slice type */
if(ps_slice_hdr->i1_slice_type == ISLICE)
{
cabac_init_idc = 0;
}
else if(ps_slice_hdr->i1_slice_type == PSLICE)
{
cabac_init_idc = ps_slice_hdr->i1_cabac_init_flag ? 2 : 1;
}
else
{
cabac_init_idc = ps_slice_hdr->i1_cabac_init_flag ? 1 : 2;
}
ps_cabac->i1_entropy_coding_sync_enabled_flag = ps_pps->i1_entropy_coding_sync_enabled_flag;
/* Dependent slices should be ON only when slice segment mode is enabled */
if(ps_slice_hdr->i1_dependent_slice_flag == 1)
{
ASSERT(
(ps_entropy_ctxt->i4_slice_segment_mode == 1) ||
(ps_entropy_ctxt->i4_slice_segment_mode == 2));
}
/* initialize the cabac engine. For dependent slice segments
cabac context models will not be reset */
if(ps_slice_hdr->i1_dependent_slice_flag == 1)
{
ret = ihevce_cabac_reset(ps_cabac, ps_bit_strm, CABAC_MODE_ENCODE_BITS);
}
else
{
ret = ihevce_cabac_init(
ps_cabac,
ps_bit_strm,
CLIP3(slice_qp, 0, IHEVC_MAX_QP),
cabac_init_idc,
CABAC_MODE_ENCODE_BITS);
/* initialize qp to slice start qp */
ps_entropy_ctxt->i1_cur_qp = slice_qp;
}
/* initialize slice x and y offset in pels w.r.t top left conrner */
x0_frm = ps_entropy_ctxt->i4_ctb_x << log2_ctb_size;
y0_frm = ps_entropy_ctxt->i4_ctb_y << log2_ctb_size;
/* Pointing ctb structure to the correct CTB in frame based on
slice address */
ps_first_ctb = ps_entropy_ctxt->ps_frm_ctb + ctb_slice_address;
ps_ctb = ps_first_ctb - 1;
//ps_entropy_ctxt->i4_ctb_slice_x = 0;
//ps_entropy_ctxt->i4_ctb_slice_y = 0;
/* Setting to NULL to detect if first CTB of slice itself
exceeds the i4_slice_segment_max_length. Will be used only if
i4_slice_segment_mode is non-zero */
s_cabac_prev_ctb.pu1_strm_buffer = NULL;
do
{
UWORD8 au1_cu_depth_top[8] = { 0 }, au1_cu_depth_left[8] = { 0 };
UWORD8 u1_skip_cu_top = 0;
UWORD32 u4_skip_cu_left = 0;
/* By default assume that slice-segment is going to end after
current CTB */
end_of_slice_seg_flag = 1;
i4_curr_ctb_x = ps_entropy_ctxt->i4_ctb_x;
i4_curr_ctb_y = ps_entropy_ctxt->i4_ctb_y;
if(1 == ps_tile_params->i4_tiles_enabled_flag)
{
ps_ctb = ps_first_ctb + ctb_ctr;
}
else
{
ps_ctb++;
}
/* Store some parameters. Will be used if current CTB's encoding
has to be reverted in the event of overflow beyond i4_slice_segment_max_length */
if(2 == ps_entropy_ctxt->i4_slice_segment_mode)
{
/* Store CU depths flag */
memcpy(au1_cu_depth_top, &ps_entropy_ctxt->pu1_cu_depth_top[i4_curr_ctb_x * 8], 8);
memcpy(au1_cu_depth_left, ps_entropy_ctxt->au1_cu_depth_left, 8);
/* Store CU skip flags */
u1_skip_cu_top = *(ps_entropy_ctxt->pu1_skip_cu_top + i4_curr_ctb_x);
u4_skip_cu_left = ps_entropy_ctxt->u4_skip_cu_left;
/* Backup current state of pic info */
s_pic_level_info_backup = *(ps_entropy_ctxt->ps_pic_level_info);
}
/* Section:7.3.7 Coding tree unit syntax */
/* coding_tree_unit() inlined here */
ps_entropy_ctxt->i1_ctb_num_pcm_blks = 0;
/* Simple Neigbour avail calculation */
ps_ctb->s_ctb_nbr_avail_flags.u1_left_avail = (x0_frm > 0);
ps_ctb->s_ctb_nbr_avail_flags.u1_top_avail = (y0_frm > 0);
ps_entropy_ctxt->i4_cu_idx = 0;
/* Encode SAO syntax as per section 7.3.8.3 */
if(ps_sps->i1_sample_adaptive_offset_enabled_flag)
{
if((ps_slice_hdr->i1_slice_sao_luma_flag) || (ps_slice_hdr->i1_slice_sao_chroma_flag))
{
/*PIC INFO: SAO encode biys*/
UWORD32 u4_bits_estimated_prev =
ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12;
ret |= ihevce_cabac_encode_sao(ps_entropy_ctxt, ps_ctb);
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
ps_entropy_ctxt->ps_pic_level_info->u8_bits_estimated_sao +=
(ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12 -
u4_bits_estimated_prev);
}
}
}
ps_entropy_ctxt->s_cabac_ctxt.u4_bits_estimated_q12 = 0;
if(ps_cabac->e_cabac_op_mode == CABAC_MODE_ENCODE_BITS)
{
/*PIC_INFO: Update total no.of CUS*/
ps_entropy_ctxt->ps_pic_level_info->i8_total_cu += ps_ctb->u1_num_cus_in_ctb;
}
/* call recursive coding tree structure to encode all cus in ctb */
ret |= ihevce_encode_coding_quadtree(
ps_entropy_ctxt, x0_frm, y0_frm, log2_ctb_size, 0, ps_ctb, ps_tile_params);
/* post ctb encode increments */
ctb_ctr++;
x0_frm += ctb_size;
ps_entropy_ctxt->i4_ctb_x++;
//ps_entropy_ctxt->i4_ctb_slice_x++;
if(ps_pps->i1_entropy_coding_sync_enabled_flag && ps_entropy_ctxt->i4_ctb_x == 2)
{
/*backup cabac context at end of second CTB(top right neighbour for start of bottom row)*/
ihevce_cabac_ctxt_backup(ps_cabac);
}
/* end of row check using x0_frm offset */
if(x0_frm >= pic_width)
{
ctb_ctr = 0;
ps_first_ctb += num_ctb_in_row;
x0_frm = 0;
y0_frm += ctb_size;
ps_entropy_ctxt->i4_ctb_x = 0;
ps_entropy_ctxt->i4_ctb_y++;
//ps_entropy_ctxt->i4_ctb_slice_y++;
}
/* Detect end of slice. Which would mean end-of-slice-segment too */
*pi4_end_of_slice_flag = (y0_frm >= pic_height);
if(0 == ps_entropy_ctxt->i4_slice_segment_mode)
{
/* If slice ends then so does slice segment */
end_of_slice_seg_flag = *pi4_end_of_slice_flag;
/* encode terminate bin */
ret |= ihevce_cabac_encode_terminate(ps_cabac, end_of_slice_seg_flag, 0);
}
else if(1 == ps_entropy_ctxt->i4_slice_segment_mode)
{
ps_entropy_ctxt->i4_slice_seg_len++;
if((ps_entropy_ctxt->i4_slice_seg_len) >= ps_entropy_ctxt->i4_slice_segment_max_length)
{
/* Store the address of CTB from where next slice segment will start */
ps_entropy_ctxt->i4_next_slice_seg_x = ps_entropy_ctxt->i4_ctb_x;
ps_entropy_ctxt->i4_next_slice_seg_y = ps_entropy_ctxt->i4_ctb_y;
}
else
{
/* If slice ends then so does slice segment */
end_of_slice_seg_flag = *pi4_end_of_slice_flag;
}
/* encode terminate bin */
ret |= ihevce_cabac_encode_terminate(ps_cabac, end_of_slice_seg_flag, 0);
}
else if(2 == ps_entropy_ctxt->i4_slice_segment_mode)
{
//WORD32 i4_slice_seg_len_prev = i4_slice_seg_len;
/* Store some parameters. Will be used to revert back to this state if
i4_slice_segment_max_length is not exceeded after encoding end-of-slice */
s_cabac_after_ctb = *ps_cabac;
u4_cur_ctb_temp =
*((UWORD32 *)(ps_cabac->pu1_strm_buffer + ps_cabac->u4_strm_buf_offset - 4));
/* encode terminate bin. For dependent slices, always simulate
end-of-slice to check if i4_slice_segment_max_length is surpassed */
ret |= ihevce_cabac_encode_terminate(ps_cabac, 1, 0);
//i4_slice_seg_len_prev = i4_slice_seg_len;
ps_entropy_ctxt->i4_slice_seg_len =
(WORD32)(ps_cabac->u4_strm_buf_offset - u4_slice_start_offset);
//ps_entropy_ctxt->i4_slice_seg_len = i4_slice_seg_len; //No need to update it.
if(ps_entropy_ctxt->i4_slice_seg_len > ps_entropy_ctxt->i4_slice_segment_max_length)
{
if(s_cabac_prev_ctb.pu1_strm_buffer == NULL)
{
/* Bytes in a single CTB has exceeded the i4_slice_segment_max_length
set by the user. Close the slice-segment and print a warning */
/* Store the address of CTB from where next slice segment will start */
ps_entropy_ctxt->i4_next_slice_seg_x = ps_entropy_ctxt->i4_ctb_x;
ps_entropy_ctxt->i4_next_slice_seg_y = ps_entropy_ctxt->i4_ctb_y;
ps_sys_api->ihevce_printf(
ps_sys_api->pv_cb_handle,
"IHEVCE_WARNING: CTB(%2d, %2d) encoded using %d bytes; "
"this exceeds max slice segment size %d as requested "
"by the user\n",
i4_curr_ctb_x,
i4_curr_ctb_y,
ps_entropy_ctxt->i4_slice_seg_len,
ps_entropy_ctxt->i4_slice_segment_max_length);
}
else /* Revert back to previous CTB's state and close current slice */
{
*ps_cabac = s_cabac_prev_ctb;
*((UWORD32 *)(ps_cabac->pu1_strm_buffer + ps_cabac->u4_strm_buf_offset - 4)) =
u4_prev_ctb_temp;
memcpy(
&ps_entropy_ctxt->pu1_cu_depth_top[i4_curr_ctb_x * 8], au1_cu_depth_top, 8);
memcpy(ps_entropy_ctxt->au1_cu_depth_left, au1_cu_depth_left, 8);
*(ps_entropy_ctxt->pu1_skip_cu_top + i4_curr_ctb_x) = u1_skip_cu_top;
ps_entropy_ctxt->u4_skip_cu_left = u4_skip_cu_left;
ps_entropy_ctxt->i1_cur_qp = i1_last_cu_qp;
/* Restore pic info */
*(ps_entropy_ctxt->ps_pic_level_info) = s_pic_level_info_backup;
/* encode terminate bin with end-of-slice */
ret |= ihevce_cabac_encode_terminate(ps_cabac, 1, 0);
/* Store the address of CTB from where next slice segment will start */
ps_entropy_ctxt->i4_next_slice_seg_x = i4_curr_ctb_x;
ps_entropy_ctxt->i4_next_slice_seg_y = i4_curr_ctb_y;
/* As we are reverted back to the previous CTB, force end of slice to zero */
*pi4_end_of_slice_flag = 0;
}
}
else if(0 == *pi4_end_of_slice_flag)
{
/* As this is not the end of slice, therefore revert back
the end-of-slice encoding and then add terminate bit */
/* Signal that this is not slice segment end */
end_of_slice_seg_flag = 0;
*ps_cabac = s_cabac_after_ctb;
*((UWORD32 *)(ps_cabac->pu1_strm_buffer + ps_cabac->u4_strm_buf_offset - 4)) =
u4_cur_ctb_temp;
/* encode terminate bin */
ret |= ihevce_cabac_encode_terminate(ps_cabac, 0, 0);
}
/* Update variables storing previous CTB's state in order to be
able to revert to previous CTB's state */
s_cabac_prev_ctb = s_cabac_after_ctb;
u4_prev_ctb_temp = u4_cur_ctb_temp;
i1_last_cu_qp = ps_entropy_ctxt->i1_cur_qp;
}
else //No other slice segment mode supported
{
ASSERT(0);
}
AEV_TRACE("end_of_slice_flag", end_of_slice_seg_flag, ps_cabac->u4_range);
if((0 == ps_entropy_ctxt->i4_ctb_x) && (!end_of_slice_seg_flag) &&
(ps_pps->i1_entropy_coding_sync_enabled_flag))
{
/* initialize qp to slice start qp */
ps_entropy_ctxt->i1_cur_qp = slice_qp;
/* flush and align to byte bounary for entropy sync every row */
ret |= ihevce_cabac_encode_terminate(ps_cabac, 1, 1);
/*This will be entered only during row end, tap bits generated in that row to cal entry point offset*/
/*add error check to make sure row count doesnt exceed the size of array allocated*/
ASSERT(ps_entropy_ctxt->i4_ctb_y < MAX_NUM_CTB_ROWS_FRM);
ps_slice_hdr->pu4_entry_point_offset[ps_entropy_ctxt->i4_ctb_y] =
ps_cabac->u4_strm_buf_offset;
/*init the cabac context with top right neighbour*/
ret |= ihevce_cabac_ctxt_row_init(ps_cabac);
}
} while(!end_of_slice_seg_flag);
if(end_of_slice_seg_flag && ps_pps->i1_entropy_coding_sync_enabled_flag)
{
ps_slice_hdr->pu4_entry_point_offset[ps_entropy_ctxt->i4_ctb_y] =
ps_cabac->u4_strm_buf_offset;
}
return ret;
}