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gerrit-public.fairphone.software / platform / external / libavc / 66556bc9a334ca71890346e3fd1b51ff740798a4 / . / encoder / ih264e_intra_modes_eval.c
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/******************************************************************************
*
* Copyright (C) 2015 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
* ih264e_intra_modes_eval.c
*
* @brief
* This file contains definitions of routines that perform rate distortion
* analysis on a macroblock if they are to be coded as intra.
*
* @author
* ittiam
*
* @par List of Functions:
* - ih264e_derive_neighbor_availability_of_mbs()
* - ih264e_derive_ngbr_avbl_of_mb_partitions()
* - ih264e_evaluate_intra16x16_modes_for_least_cost_rdoptoff()
* - ih264e_evaluate_intra8x8_modes_for_least_cost_rdoptoff()
* - ih264e_evaluate_intra4x4_modes_for_least_cost_rdoptoff()
* - ih264e_evaluate_intra4x4_modes_for_least_cost_rdopton()
* - ih264e_evaluate_chroma_intra8x8_modes_for_least_cost_rdoptoff()
* - ih264e_evaluate_intra16x16_modes()
* - ih264e_evaluate_intra4x4_modes()
* - ih264e_evaluate_intra_chroma_modes()
*
* @remarks
* None
*
*******************************************************************************
*/
/*****************************************************************************/
/* File Includes */
/*****************************************************************************/
/* System include files */
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
/* User include files */
#include "ih264e_config.h"
#include "ih264_typedefs.h"
#include "ih264e_defs.h"
#include "iv2.h"
#include "ive2.h"
#include "ih264_debug.h"
#include "ih264_defs.h"
#include "ih264_macros.h"
#include "ih264_intra_pred_filters.h"
#include "ih264_structs.h"
#include "ih264_common_tables.h"
#include "ih264_trans_quant_itrans_iquant.h"
#include "ih264_inter_pred_filters.h"
#include "ih264_mem_fns.h"
#include "ih264_padding.h"
#include "ih264_deblk_edge_filters.h"
#include "ih264_cabac_tables.h"
#include "ime_distortion_metrics.h"
#include "ih264e_error.h"
#include "ih264e_bitstream.h"
#include "ime_defs.h"
#include "ime_structs.h"
#include "irc_cntrl_param.h"
#include "irc_frame_info_collector.h"
#include "ih264e_rate_control.h"
#include "ih264e_cabac_structs.h"
#include "ih264e_structs.h"
#include "ih264e_intra_modes_eval.h"
#include "ih264e_globals.h"
#include "ime_platform_macros.h"
/*****************************************************************************/
/* Function Definitions */
/*****************************************************************************/
/**
******************************************************************************
*
* @brief
* derivation process for macroblock availability
*
* @par Description
* Calculates the availability of the left, top, topright and topleft macroblocks.
*
* @param[in] ps_proc_ctxt
* pointer to proc context (handle)
*
* @remarks Based on section 6.4.5 in H264 spec
*
* @return none
*
******************************************************************************
*/
void ih264e_derive_nghbr_avbl_of_mbs(process_ctxt_t *ps_proc)
{
UWORD8 *pu1_slice_idx_curr = ps_proc->pu1_slice_idx;
UWORD8 *pu1_slice_idx_b;
UWORD8 *pu1_slice_idx_a;
UWORD8 *pu1_slice_idx_c;
UWORD8 *pu1_slice_idx_d;
block_neighbors_t *ps_ngbr_avbl;
WORD32 i4_mb_x, i4_mb_y;
WORD32 i4_wd_mbs;
i4_mb_x = ps_proc->i4_mb_x;
i4_mb_y = ps_proc->i4_mb_y;
i4_wd_mbs = ps_proc->i4_wd_mbs;
pu1_slice_idx_curr += (i4_mb_y * i4_wd_mbs) + i4_mb_x;
pu1_slice_idx_a = pu1_slice_idx_curr - 1;
pu1_slice_idx_b = pu1_slice_idx_curr - i4_wd_mbs;
pu1_slice_idx_c = pu1_slice_idx_b + 1;
pu1_slice_idx_d = pu1_slice_idx_b - 1;
ps_ngbr_avbl = ps_proc->ps_ngbr_avbl;
/**********************************************************************/
/* The macroblock is marked as available, unless one of the following */
/* conditions is true in which case the macroblock shall be marked as */
/* not available. */
/* 1. mbAddr < 0 */
/* 2 mbAddr > CurrMbAddr */
/* 3. the macroblock with address mbAddr belongs to a different slice */
/* than the macroblock with address CurrMbAddr */
/**********************************************************************/
/* left macroblock availability */
if (i4_mb_x == 0)
{ /* macroblocks along first column */
ps_ngbr_avbl->u1_mb_a = 0;
}
else
{ /* macroblocks belong to same slice? */
if (*pu1_slice_idx_a != *pu1_slice_idx_curr)
ps_ngbr_avbl->u1_mb_a = 0;
else
ps_ngbr_avbl->u1_mb_a = 1;
}
/* top macroblock availability */
if (i4_mb_y == 0)
{ /* macroblocks along first row */
ps_ngbr_avbl->u1_mb_b = 0;
}
else
{ /* macroblocks belong to same slice? */
if (*pu1_slice_idx_b != *pu1_slice_idx_curr)
ps_ngbr_avbl->u1_mb_b = 0;
else
ps_ngbr_avbl->u1_mb_b = 1;
}
/* top right macroblock availability */
if (i4_mb_x == i4_wd_mbs-1 || i4_mb_y == 0)
{ /* macroblocks along last column */
ps_ngbr_avbl->u1_mb_c = 0;
}
else
{ /* macroblocks belong to same slice? */
if (*pu1_slice_idx_c != *pu1_slice_idx_curr)
ps_ngbr_avbl->u1_mb_c = 0;
else
ps_ngbr_avbl->u1_mb_c = 1;
}
/* top left macroblock availability */
if (i4_mb_x == 0 || i4_mb_y == 0)
{ /* macroblocks along first column */
ps_ngbr_avbl->u1_mb_d = 0;
}
else
{ /* macroblocks belong to same slice? */
if (*pu1_slice_idx_d != *pu1_slice_idx_curr)
ps_ngbr_avbl->u1_mb_d = 0;
else
ps_ngbr_avbl->u1_mb_d = 1;
}
}
/**
******************************************************************************
*
* @brief
* derivation process for subblock/partition availability
*
* @par Description
* Calculates the availability of the left, top, topright and topleft subblock
* or partitions.
*
* @param[in] ps_proc_ctxt
* pointer to macroblock context (handle)
*
* @param[in] i1_pel_pos_x
* column position of the pel wrt the current block
*
* @param[in] i1_pel_pos_y
* row position of the pel in wrt current block
*
* @remarks Assumptions: before calling this function it is assumed that
* the neighbor availability of the current macroblock is already derived.
* Based on table 6-3 of H264 specification
*
* @return availability status (yes or no)
*
******************************************************************************
*/
UWORD8 ih264e_derive_ngbr_avbl_of_mb_partitions(block_neighbors_t *ps_ngbr_avbl,
WORD8 i1_pel_pos_x,
WORD8 i1_pel_pos_y)
{
UWORD8 u1_neighbor_avail=0;
/**********************************************************************/
/* values of i1_pel_pos_x in the range 0-15 inclusive correspond to */
/* various columns of a macroblock */
/* */
/* values of i1_pel_pos_y in the range 0-15 inclusive correspond to */
/* various rows of a macroblock */
/* */
/* other values of i1_pel_pos_x & i1_pel_pos_y represents elements */
/* outside the bound of an mb ie., represents its neighbors. */
/**********************************************************************/
if (i1_pel_pos_x < 0)
{ /* column(-1) */
if (i1_pel_pos_y < 0)
{ /* row(-1) */
u1_neighbor_avail = ps_ngbr_avbl->u1_mb_d; /* current mb topleft availability */
}
else if (i1_pel_pos_y >= 0 && i1_pel_pos_y < 16)
{ /* all rows of a macroblock */
u1_neighbor_avail = ps_ngbr_avbl->u1_mb_a; /* current mb left availability */
}
else /* if (i1_pel_pos_y >= 16) */
{ /* rows(+16) */
u1_neighbor_avail = 0; /* current mb bottom left availability */
}
}
else if (i1_pel_pos_x >= 0 && i1_pel_pos_x < 16)
{ /* all columns of a macroblock */
if (i1_pel_pos_y < 0)
{ /* row(-1) */
u1_neighbor_avail = ps_ngbr_avbl->u1_mb_b; /* current mb top availability */
}
else if (i1_pel_pos_y >= 0 && i1_pel_pos_y < 16)
{ /* all rows of a macroblock */
u1_neighbor_avail = 1; /* current mb availability */
/* availability of the partition is dependent on the position of the partition inside the mb */
/* although the availability is declared as 1 in all cases these needs to be corrected somewhere else and this is not done in here */
}
else /* if (i1_pel_pos_y >= 16) */
{ /* rows(+16) */
u1_neighbor_avail = 0; /* current mb bottom availability */
}
}
else if (i1_pel_pos_x >= 16)
{ /* column(+16) */
if (i1_pel_pos_y < 0)
{ /* row(-1) */
u1_neighbor_avail = ps_ngbr_avbl->u1_mb_c; /* current mb top right availability */
}
else /* if (i1_pel_pos_y >= 0) */
{ /* all other rows */
u1_neighbor_avail = 0; /* current mb right & bottom right availability */
}
}
return u1_neighbor_avail;
}
/**
******************************************************************************
*
* @brief
* evaluate best intra 16x16 mode (rate distortion opt off)
*
* @par Description
* This function evaluates all the possible intra 16x16 modes and finds the mode
* that best represents the macro-block (least distortion) and occupies fewer
* bits in the bit-stream.
*
* @param[in] ps_proc_ctxt
* pointer to process context (handle)
*
* @remarks
* Ideally the cost of encoding a macroblock is calculated as
* (distortion + lambda*rate). Where distortion is SAD/SATD,... between the
* input block and the reconstructed block and rate is the number of bits taken
* to place the macroblock in the bit-stream. In this routine the rate does not
* exactly point to the total number of bits it takes, rather it points to header
* bits necessary for encoding the macroblock. Assuming the deltaQP, cbp bits
* and residual bits fall in to texture bits the number of bits taken to encoding
* mbtype is considered as rate, we compute cost. Further we will approximate
* the distortion as the deviation b/w input and the predicted block as opposed
* to input and reconstructed block.
*
* NOTE: As per the Document JVT-O079, for intra 16x16 macroblock,
* the SAD and cost are one and the same.
*
* @return none
*
******************************************************************************
*/
void ih264e_evaluate_intra16x16_modes_for_least_cost_rdoptoff(process_ctxt_t *ps_proc)
{
/* Codec Context */
codec_t *ps_codec = ps_proc->ps_codec;
/* SAD(distortion metric) of an 8x8 block */
WORD32 i4_mb_distortion = INT_MAX, i4_mb_distortion_least = INT_MAX;
/* lambda */
UWORD32 u4_lambda = ps_proc->u4_lambda;
/* cost = distortion + lambda*rate */
WORD32 i4_mb_cost= INT_MAX, i4_mb_cost_least = INT_MAX;
/* intra mode */
UWORD32 u4_intra_mode, u4_best_intra_16x16_mode = DC_I16x16;
/* neighbor pels for intra prediction */
UWORD8 *pu1_ngbr_pels_i16 = ps_proc->au1_ngbr_pels;
/* neighbor availability */
WORD32 i4_ngbr_avbl;
/* pointer to src macro block */
UWORD8 *pu1_curr_mb = ps_proc->pu1_src_buf_luma;
UWORD8 *pu1_ref_mb = ps_proc->pu1_rec_buf_luma;
/* pointer to prediction macro block */
UWORD8 *pu1_pred_mb_intra_16x16 = ps_proc->pu1_pred_mb_intra_16x16;
UWORD8 *pu1_pred_mb_intra_16x16_plane = ps_proc->pu1_pred_mb_intra_16x16_plane;
/* strides */
WORD32 i4_src_strd = ps_proc->i4_src_strd;
WORD32 i4_pred_strd = ps_proc->i4_pred_strd;
WORD32 i4_rec_strd = ps_proc->i4_rec_strd;
/* pointer to neighbors left, top, topleft */
UWORD8 *pu1_mb_a = pu1_ref_mb - 1;
UWORD8 *pu1_mb_b = pu1_ref_mb - i4_rec_strd;
UWORD8 *pu1_mb_d = pu1_mb_b - 1;
UWORD8 u1_mb_a, u1_mb_b, u1_mb_d;
/* valid intra modes map */
UWORD32 u4_valid_intra_modes;
/* lut for valid intra modes */
const UWORD8 u1_valid_intra_modes[8] = {4, 6, 4, 6, 5, 7, 5, 15};
/* temp var */
UWORD32 i, u4_enable_fast_sad = 0, offset = 0;
mb_info_t *ps_top_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
UWORD32 u4_constrained_intra_pred = ps_proc->ps_codec->s_cfg.u4_constrained_intra_pred;
/* init temp var */
if (ps_proc->i4_slice_type != ISLICE)
{
/* Offset for MBtype */
offset = (ps_proc->i4_slice_type == PSLICE) ? 5 : 23;
u4_enable_fast_sad = ps_proc->s_me_ctxt.u4_enable_fast_sad;
}
/* locating neighbors that are available for prediction */
/* gather prediction pels from the neighbors, if particular set is not available
* it is set to zero*/
/* left pels */
u1_mb_a = ((ps_proc->ps_ngbr_avbl->u1_mb_a)
&& (u4_constrained_intra_pred ? ps_proc->s_left_mb_syntax_ele.u2_is_intra : 1));
if (u1_mb_a)
{
for(i = 0; i < 16; i++)
pu1_ngbr_pels_i16[16-1-i] = pu1_mb_a[i * i4_rec_strd];
}
else
{
ps_codec->pf_mem_set_mul8(pu1_ngbr_pels_i16,0,MB_SIZE);
}
/* top pels */
u1_mb_b = ((ps_proc->ps_ngbr_avbl->u1_mb_b)
&& (u4_constrained_intra_pred ? ps_top_mb_syn_ele->u2_is_intra : 1));
if (u1_mb_b)
{
ps_codec->pf_mem_cpy_mul8(pu1_ngbr_pels_i16+16+1,pu1_mb_b,16);
}
else
{
ps_codec->pf_mem_set_mul8(pu1_ngbr_pels_i16+16+1,0,MB_SIZE);
}
/* topleft pels */
u1_mb_d = ((ps_proc->ps_ngbr_avbl->u1_mb_d)
&& (u4_constrained_intra_pred ? ps_proc->s_top_left_mb_syntax_ele.u2_is_intra : 1));
if (u1_mb_d)
{
pu1_ngbr_pels_i16[16] = *pu1_mb_d;
}
else
{
pu1_ngbr_pels_i16[16] = 0;
}
i4_ngbr_avbl = (u1_mb_a) + (u1_mb_b << 2) + (u1_mb_d << 1);
ps_proc->i4_ngbr_avbl_16x16_mb = i4_ngbr_avbl;
/* set valid intra modes for evaluation */
u4_valid_intra_modes = u1_valid_intra_modes[i4_ngbr_avbl];
if (ps_codec->s_cfg.u4_enc_speed_preset == IVE_FAST ||
ps_codec->s_cfg.u4_enc_speed_preset == IVE_FASTEST)
u4_valid_intra_modes &= ~(1 << PLANE_I16x16);
/* evaluate b/w HORZ_I16x16, VERT_I16x16 & DC_I16x16 */
ps_codec->pf_ih264e_evaluate_intra16x16_modes(pu1_curr_mb, pu1_ngbr_pels_i16, pu1_pred_mb_intra_16x16,
i4_src_strd, i4_pred_strd,
i4_ngbr_avbl, &u4_intra_mode, &i4_mb_distortion_least,
u4_valid_intra_modes);
/* cost = distortion + lambda*rate */
i4_mb_cost_least = i4_mb_distortion_least;
if (((u4_valid_intra_modes >> 3) & 1) != 0)
{
/* intra prediction for PLANE mode*/
(ps_codec->apf_intra_pred_16_l)[PLANE_I16x16](pu1_ngbr_pels_i16, pu1_pred_mb_intra_16x16_plane, 0, i4_pred_strd, i4_ngbr_avbl);
/* evaluate distortion between the actual blk and the estimated blk for the given mode */
ps_codec->apf_compute_sad_16x16[u4_enable_fast_sad](pu1_curr_mb, pu1_pred_mb_intra_16x16_plane, i4_src_strd, i4_pred_strd, i4_mb_cost_least, &i4_mb_distortion);
/* cost = distortion + lambda*rate */
i4_mb_cost = i4_mb_distortion;
/* update the least cost information if necessary */
if(i4_mb_cost < i4_mb_distortion_least)
{
u4_intra_mode = PLANE_I16x16;
i4_mb_cost_least = i4_mb_cost;
i4_mb_distortion_least = i4_mb_distortion;
}
}
u4_best_intra_16x16_mode = u4_intra_mode;
DEBUG("%d partition cost, %d intra mode\n", i4_mb_cost_least * 32, u4_best_intra_16x16_mode);
ps_proc->u1_l_i16_mode = u4_best_intra_16x16_mode;
/* cost = distortion + lambda*rate */
i4_mb_cost_least = i4_mb_distortion_least + u4_lambda*u1_uev_codelength[offset + u4_best_intra_16x16_mode];
/* update the type of the mb if necessary */
if (i4_mb_cost_least < ps_proc->i4_mb_cost)
{
ps_proc->i4_mb_cost = i4_mb_cost_least;
ps_proc->i4_mb_distortion = i4_mb_distortion_least;
ps_proc->u4_mb_type = I16x16;
}
return ;
}
/**
******************************************************************************
*
* @brief
* evaluate best intra 8x8 mode (rate distortion opt on)
*
* @par Description
* This function evaluates all the possible intra 8x8 modes and finds the mode
* that best represents the macro-block (least distortion) and occupies fewer
* bits in the bit-stream.
*
* @param[in] ps_proc_ctxt
* pointer to proc ctxt
*
* @remarks Ideally the cost of encoding a macroblock is calculated as
* (distortion + lambda*rate). Where distortion is SAD/SATD,... between the
* input block and the reconstructed block and rate is the number of bits taken
* to place the macroblock in the bit-stream. In this routine the rate does not
* exactly point to the total number of bits it takes, rather it points to header
* bits necessary for encoding the macroblock. Assuming the deltaQP, cbp bits
* and residual bits fall in to texture bits the number of bits taken to encoding
* mbtype is considered as rate, we compute cost. Further we will approximate
* the distortion as the deviation b/w input and the predicted block as opposed
* to input and reconstructed block.
*
* NOTE: TODO: This function needs to be tested
*
* @return none
*
******************************************************************************
*/
void ih264e_evaluate_intra8x8_modes_for_least_cost_rdoptoff(process_ctxt_t *ps_proc)
{
/* Codec Context */
codec_t *ps_codec = ps_proc->ps_codec;
/* SAD(distortion metric) of an 4x4 block */
WORD32 i4_partition_distortion, i4_partition_distortion_least = INT_MAX, i4_total_distortion = 0;
/* lambda */
UWORD32 u4_lambda = ps_proc->u4_lambda;
/* cost = distortion + lambda*rate */
WORD32 i4_partition_cost, i4_partition_cost_least, i4_total_cost = u4_lambda;
/* cost due to mbtype */
UWORD32 u4_cost_one_bit = u4_lambda, u4_cost_four_bits = 4 * u4_lambda;
/* intra mode */
UWORD32 u4_intra_mode, u4_best_intra_8x8_mode = DC_I8x8, u4_estimated_intra_8x8_mode;
/* neighbor pels for intra prediction */
UWORD8 *pu1_ngbr_pels_i8 = ps_proc->au1_ngbr_pels;
/* pointer to curr partition */
UWORD8 *pu1_mb_curr;
/* pointer to prediction macro block */
UWORD8 *pu1_pred_mb = ps_proc->pu1_pred_mb;
/* strides */
WORD32 i4_src_strd = ps_proc->i4_src_strd;
WORD32 i4_pred_strd = ps_proc->i4_pred_strd;
/* neighbors left, top, top right, top left */
UWORD8 *pu1_mb_a;
UWORD8 *pu1_mb_b;
UWORD8 *pu1_mb_d;
/* neighbor availability */
WORD32 i4_ngbr_avbl;
block_neighbors_t s_ngbr_avbl;
/* temp vars */
UWORD32 b8, u4_pix_x, u4_pix_y;
UWORD32 u4_constrained_intra_pred = ps_proc->ps_codec->s_cfg.u4_constrained_intra_pred;
block_neighbors_t s_ngbr_avbl_MB;
/* ngbr mb syntax information */
UWORD8 *pu1_top_mb_intra_modes = ps_proc->pu1_top_mb_intra_modes + (ps_proc->i4_mb_x << 4);
mb_info_t *ps_top_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
mb_info_t *ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
/* valid intra modes map */
UWORD32 u4_valid_intra_modes;
if (ps_proc->ps_ngbr_avbl->u1_mb_c)
{
ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + (ps_proc->i4_mb_x + 1);
}
/* left pels */
s_ngbr_avbl_MB.u1_mb_a = ((ps_proc->ps_ngbr_avbl->u1_mb_a)
&& (u4_constrained_intra_pred ? ps_proc->s_left_mb_syntax_ele.u2_is_intra : 1));
/* top pels */
s_ngbr_avbl_MB.u1_mb_b = ((ps_proc->ps_ngbr_avbl->u1_mb_b)
&& (u4_constrained_intra_pred ? ps_top_mb_syn_ele->u2_is_intra : 1));
/* topleft pels */
s_ngbr_avbl_MB.u1_mb_d = ((ps_proc->ps_ngbr_avbl->u1_mb_d)
&& (u4_constrained_intra_pred ? ps_proc->s_top_left_mb_syntax_ele.u2_is_intra : 1));
/* top right */
s_ngbr_avbl_MB.u1_mb_c = ((ps_proc->ps_ngbr_avbl->u1_mb_c)
&& (u4_constrained_intra_pred ? ps_top_right_mb_syn_ele->u2_is_intra : 1));
for(b8 = 0; b8 < 4; b8++)
{
u4_pix_x = (b8 & 0x01) << 3;
u4_pix_y = (b8 >> 1) << 3;
pu1_mb_curr = ps_proc->pu1_src_buf_luma + u4_pix_x + (u4_pix_y * i4_src_strd);
/* when rdopt is off, we use the input as reference for constructing prediction buffer */
/* as opposed to using the recon pels. (open loop intra prediction) */
pu1_mb_a = pu1_mb_curr - 1; /* pointer to left macro block */
pu1_mb_b = pu1_mb_curr - i4_src_strd; /* pointer to top macro block */
pu1_mb_d = pu1_mb_b - 1; /* pointer to top left macro block */
/* locating neighbors that are available for prediction */
/* TODO : update the neighbor availability information basing on constrained intra pred information */
/* TODO : i4_ngbr_avbl is only being used in DC mode. Can the DC mode be split in to distinct routines */
/* basing on neighbors available and hence evade the computation of neighbor availability totally. */
s_ngbr_avbl.u1_mb_a = ih264e_derive_ngbr_avbl_of_mb_partitions(&s_ngbr_avbl_MB, u4_pix_x - 1, u4_pix_y); /* xD = -1, yD = 0 */
s_ngbr_avbl.u1_mb_b = ih264e_derive_ngbr_avbl_of_mb_partitions(&s_ngbr_avbl_MB, u4_pix_x, u4_pix_y - 1); /* xD = 0, yD = -1 */
s_ngbr_avbl.u1_mb_c = ih264e_derive_ngbr_avbl_of_mb_partitions(&s_ngbr_avbl_MB, u4_pix_x + 8, u4_pix_y - 1); /* xD = BLK_8x8_SIZE, yD = -1 */
s_ngbr_avbl.u1_mb_d = ih264e_derive_ngbr_avbl_of_mb_partitions(&s_ngbr_avbl_MB, u4_pix_x - 1, u4_pix_y - 1); /* xD = -1, yD = -1 */
/* i4_ngbr_avbl = blk_a * LEFT_MB_AVAILABLE_MASK + blk_b * TOP_MB_AVAILABLE_MASK + blk_c * TOP_RIGHT_MB_AVAILABLE_MASK + blk_d * TOP_LEFT_MB_AVAILABLE_MASK */
i4_ngbr_avbl = (s_ngbr_avbl.u1_mb_a) + (s_ngbr_avbl.u1_mb_d << 1) + (s_ngbr_avbl.u1_mb_b << 2) + (s_ngbr_avbl.u1_mb_c << 3) +
(s_ngbr_avbl.u1_mb_a << 4);
/* if top partition is available and top right is not available for intra prediction, then */
/* padd top right samples using top sample and make top right also available */
/* i4_ngbr_avbl = (s_ngbr_avbl.u1_mb_a) + (s_ngbr_avbl.u1_mb_d << 1) + (s_ngbr_avbl.u1_mb_b << 2) + ((s_ngbr_avbl.u1_mb_b | s_ngbr_avbl.u1_mb_c) << 3); */
ps_proc->ai4_neighbor_avail_8x8_subblks[b8] = i4_ngbr_avbl;
ih264_intra_pred_luma_8x8_mode_ref_filtering(pu1_mb_a, pu1_mb_b, pu1_mb_d, pu1_ngbr_pels_i8,
i4_src_strd, i4_ngbr_avbl);
i4_partition_cost_least = INT_MAX;
/* set valid intra modes for evaluation */
u4_valid_intra_modes = 0x1ff;
if (!s_ngbr_avbl.u1_mb_b)
{
u4_valid_intra_modes &= ~(1 << VERT_I4x4);
u4_valid_intra_modes &= ~(1 << DIAG_DL_I4x4);
u4_valid_intra_modes &= ~(1 << VERT_L_I4x4);
}
if (!s_ngbr_avbl.u1_mb_a)
{
u4_valid_intra_modes &= ~(1 << HORZ_I4x4);
u4_valid_intra_modes &= ~(1 << HORZ_U_I4x4);
}
if (!s_ngbr_avbl.u1_mb_a || !s_ngbr_avbl.u1_mb_b || !s_ngbr_avbl.u1_mb_d)
{
u4_valid_intra_modes &= ~(1 << DIAG_DR_I4x4);
u4_valid_intra_modes &= ~(1 << VERT_R_I4x4);
u4_valid_intra_modes &= ~(1 << HORZ_D_I4x4);
}
/* estimate the intra 8x8 mode for the current partition (for evaluating cost) */
if (!s_ngbr_avbl.u1_mb_a || !s_ngbr_avbl.u1_mb_b)
{
u4_estimated_intra_8x8_mode = DC_I8x8;
}
else
{
UWORD32 u4_left_intra_8x8_mode = DC_I8x8;
UWORD32 u4_top_intra_8x8_mode = DC_I8x8;
if (u4_pix_x == 0)
{
if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I8x8)
{
u4_left_intra_8x8_mode = ps_proc->au1_left_mb_intra_modes[b8+1];
}
else if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I4x4)
{
u4_left_intra_8x8_mode = ps_proc->au1_left_mb_intra_modes[(b8+1)*4+2];
}
}
else
{
u4_left_intra_8x8_mode = ps_proc->au1_intra_luma_mb_8x8_modes[b8-1];
}
if (u4_pix_y == 0)
{
if (ps_top_mb_syn_ele->u2_mb_type == I8x8)
{
u4_top_intra_8x8_mode = pu1_top_mb_intra_modes[b8+2];
}
else if (ps_top_mb_syn_ele->u2_mb_type == I4x4)
{
u4_top_intra_8x8_mode = pu1_top_mb_intra_modes[(b8+2)*4+2];
}
}
else
{
u4_top_intra_8x8_mode = ps_proc->au1_intra_luma_mb_8x8_modes[b8-2];
}
u4_estimated_intra_8x8_mode = MIN(u4_left_intra_8x8_mode, u4_top_intra_8x8_mode);
}
/* perform intra mode 8x8 evaluation */
for (u4_intra_mode = VERT_I8x8; u4_valid_intra_modes != 0; u4_intra_mode++, u4_valid_intra_modes >>= 1)
{
if ( (u4_valid_intra_modes & 1) == 0)
continue;
/* intra prediction */
(ps_codec->apf_intra_pred_8_l)[u4_intra_mode](pu1_ngbr_pels_i8, pu1_pred_mb, 0, i4_pred_strd, i4_ngbr_avbl);
/* evaluate distortion between the actual blk and the estimated blk for the given mode */
ime_compute_sad_8x8(pu1_mb_curr, pu1_pred_mb, i4_src_strd, i4_pred_strd, i4_partition_cost_least, &i4_partition_distortion);
i4_partition_cost = i4_partition_distortion + ((u4_estimated_intra_8x8_mode == u4_intra_mode)?u4_cost_one_bit:u4_cost_four_bits);
/* update the least cost information if necessary */
if (i4_partition_cost < i4_partition_cost_least)
{
i4_partition_cost_least = i4_partition_cost;
i4_partition_distortion_least = i4_partition_distortion;
u4_best_intra_8x8_mode = u4_intra_mode;
}
}
/* macroblock distortion */
i4_total_cost += i4_partition_cost_least;
i4_total_distortion += i4_partition_distortion_least;
/* mb partition mode */
ps_proc->au1_intra_luma_mb_8x8_modes[b8] = u4_best_intra_8x8_mode;
}
/* update the type of the mb if necessary */
if (i4_total_cost < ps_proc->i4_mb_cost)
{
ps_proc->i4_mb_cost = i4_total_cost;
ps_proc->i4_mb_distortion = i4_total_distortion;
ps_proc->u4_mb_type = I8x8;
}
return ;
}
/**
******************************************************************************
*
* @brief
* evaluate best intra 4x4 mode (rate distortion opt off)
*
* @par Description
* This function evaluates all the possible intra 4x4 modes and finds the mode
* that best represents the macro-block (least distortion) and occupies fewer
* bits in the bit-stream.
*
* @param[in] ps_proc_ctxt
* pointer to proc ctxt
*
* @remarks
* Ideally the cost of encoding a macroblock is calculated as
* (distortion + lambda*rate). Where distortion is SAD/SATD,... between the
* input block and the reconstructed block and rate is the number of bits taken
* to place the macroblock in the bit-stream. In this routine the rate does not
* exactly point to the total number of bits it takes, rather it points to header
* bits necessary for encoding the macroblock. Assuming the deltaQP, cbp bits
* and residual bits fall in to texture bits the number of bits taken to encoding
* mbtype is considered as rate, we compute cost. Further we will approximate
* the distortion as the deviation b/w input and the predicted block as opposed
* to input and reconstructed block.
*
* NOTE: As per the Document JVT-O079, for the whole intra 4x4 macroblock,
* 24*lambda is added to the SAD before comparison with the best SAD for
* inter prediction. This is an empirical value to prevent using too many intra
* blocks.
*
* @return none
*
******************************************************************************
*/
void ih264e_evaluate_intra4x4_modes_for_least_cost_rdoptoff(process_ctxt_t *ps_proc)
{
/* Codec Context */
codec_t *ps_codec = ps_proc->ps_codec;
/* SAD(distortion metric) of an 4x4 block */
WORD32 i4_partition_distortion_least = INT_MAX, i4_total_distortion = 0;
/* lambda */
UWORD32 u4_lambda = ps_proc->u4_lambda;
/* cost = distortion + lambda*rate */
WORD32 i4_partition_cost_least, i4_total_cost = (24 + 1) * u4_lambda;
/* cost due to mbtype */
UWORD32 u4_cost_one_bit = u4_lambda, u4_cost_four_bits = 4 * u4_lambda;
/* intra mode */
UWORD32 u4_best_intra_4x4_mode = DC_I4x4, u4_estimated_intra_4x4_mode;
/* neighbor pels for intra prediction */
UWORD8 *pu1_ngbr_pels_i4 = ps_proc->au1_ngbr_pels;
/* pointer to curr partition */
UWORD8 *pu1_mb_curr;
/* pointer to prediction macro block */
UWORD8 *pu1_pred_mb = ps_proc->pu1_pred_mb;
/* strides */
WORD32 i4_src_strd = ps_proc->i4_src_strd;
WORD32 i4_pred_strd = ps_proc->i4_pred_strd;
/* neighbors left, top, top right, top left */
UWORD8 *pu1_mb_a;
UWORD8 *pu1_mb_b;
UWORD8 *pu1_mb_c;
UWORD8 *pu1_mb_d;
/* neighbor availability */
WORD32 i4_ngbr_avbl;
block_neighbors_t s_ngbr_avbl;
/* temp vars */
UWORD32 i, b8, b4, u4_blk_x, u4_blk_y, u4_pix_x, u4_pix_y;
/* scan order inside 4x4 block */
const UWORD8 u1_scan_order[16] = {0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15};
/* ngbr sub mb modes */
UWORD8 *pu1_top_mb_intra_modes = ps_proc->pu1_top_mb_intra_modes + (ps_proc->i4_mb_x << 4);
mb_info_t *ps_top_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
mb_info_t *ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
/* valid intra modes map */
UWORD32 u4_valid_intra_modes;
UWORD16 u2_valid_modes[8] = {4, 262, 4, 262, 141, 399, 141, 511};
UWORD32 u4_constrained_intra_pred = ps_proc->ps_codec->s_cfg.u4_constrained_intra_pred;
UWORD8 u1_mb_a, u1_mb_b, u1_mb_c, u1_mb_d;
if (ps_proc->ps_ngbr_avbl->u1_mb_c)
{
ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x + 1;
}
/* left pels */
u1_mb_a = ((ps_proc->ps_ngbr_avbl->u1_mb_a)
&& (u4_constrained_intra_pred ? ps_proc->s_left_mb_syntax_ele.u2_is_intra : 1));
/* top pels */
u1_mb_b = ((ps_proc->ps_ngbr_avbl->u1_mb_b)
&& (u4_constrained_intra_pred ? ps_top_mb_syn_ele->u2_is_intra : 1));
/* topleft pels */
u1_mb_d = ((ps_proc->ps_ngbr_avbl->u1_mb_d)
&& (u4_constrained_intra_pred ? ps_proc->s_top_left_mb_syntax_ele.u2_is_intra : 1));
/* top right */
u1_mb_c = ((ps_proc->ps_ngbr_avbl->u1_mb_c)
&& (u4_constrained_intra_pred ? ps_top_right_mb_syn_ele->u2_is_intra : 1));
i4_ngbr_avbl = (u1_mb_a) + (u1_mb_d << 1) + (u1_mb_b << 2) + (u1_mb_c << 3);
memcpy(ps_proc->au1_ngbr_avbl_4x4_subblks, gau1_ih264_4x4_ngbr_avbl[i4_ngbr_avbl], 16);
for (b8 = 0; b8 < 4; b8++)
{
u4_blk_x = (b8 & 0x01) << 3;
u4_blk_y = (b8 >> 1) << 3;
for (b4 = 0; b4 < 4; b4++)
{
u4_pix_x = u4_blk_x + ((b4 & 0x01) << 2);
u4_pix_y = u4_blk_y + ((b4 >> 1) << 2);
pu1_mb_curr = ps_proc->pu1_src_buf_luma + u4_pix_x + (u4_pix_y * i4_src_strd);
/* when rdopt is off, we use the input as reference for constructing prediction buffer */
/* as opposed to using the recon pels. (open loop intra prediction) */
pu1_mb_a = pu1_mb_curr - 1; /* pointer to left macro block */
pu1_mb_b = pu1_mb_curr - i4_src_strd; /* pointer to top macro block */
pu1_mb_c = pu1_mb_b + 4; /* pointer to top macro block */
pu1_mb_d = pu1_mb_b - 1; /* pointer to top left macro block */
/* locating neighbors that are available for prediction */
/* TODO : update the neighbor availability information basing on constrained intra pred information */
/* TODO : i4_ngbr_avbl is only being used in DC mode. Can the DC mode be split in to distinct routines */
/* basing on neighbors available and hence evade the computation of neighbor availability totally. */
i4_ngbr_avbl = ps_proc->au1_ngbr_avbl_4x4_subblks[(b8 << 2) + b4];
s_ngbr_avbl.u1_mb_a = (i4_ngbr_avbl & 0x1);
s_ngbr_avbl.u1_mb_d = (i4_ngbr_avbl & 0x2) >> 1;
s_ngbr_avbl.u1_mb_b = (i4_ngbr_avbl & 0x4) >> 2;
s_ngbr_avbl.u1_mb_c = (i4_ngbr_avbl & 0x8) >> 3;
/* set valid intra modes for evaluation */
u4_valid_intra_modes = u2_valid_modes[i4_ngbr_avbl & 0x7];
/* if top partition is available and top right is not available for intra prediction, then */
/* padd top right samples using top sample and make top right also available */
/* i4_ngbr_avbl = (s_ngbr_avbl.u1_mb_a) + (s_ngbr_avbl.u1_mb_d << 1) + (s_ngbr_avbl.u1_mb_b << 2) + ((s_ngbr_avbl.u1_mb_b | s_ngbr_avbl.u1_mb_c) << 3); */
/* gather prediction pels from the neighbors */
if (s_ngbr_avbl.u1_mb_a)
{
for(i = 0; i < 4; i++)
pu1_ngbr_pels_i4[4 - 1 -i] = pu1_mb_a[i * i4_src_strd];
}
else
{
memset(pu1_ngbr_pels_i4, 0, 4);
}
if (s_ngbr_avbl.u1_mb_b)
{
memcpy(pu1_ngbr_pels_i4 + 4 + 1, pu1_mb_b, 4);
}
else
{
memset(pu1_ngbr_pels_i4 + 5, 0, 4);
}
if (s_ngbr_avbl.u1_mb_d)
pu1_ngbr_pels_i4[4] = *pu1_mb_d;
else
pu1_ngbr_pels_i4[4] = 0;
if (s_ngbr_avbl.u1_mb_c)
{
memcpy(pu1_ngbr_pels_i4 + 8 + 1, pu1_mb_c, 4);
}
else if (s_ngbr_avbl.u1_mb_b)
{
memset(pu1_ngbr_pels_i4 + 8 + 1, pu1_ngbr_pels_i4[8], 4);
s_ngbr_avbl.u1_mb_c = s_ngbr_avbl.u1_mb_b;
}
i4_partition_cost_least = INT_MAX;
/* predict the intra 4x4 mode for the current partition (for evaluating cost) */
if (!s_ngbr_avbl.u1_mb_a || !s_ngbr_avbl.u1_mb_b)
{
u4_estimated_intra_4x4_mode = DC_I4x4;
}
else
{
UWORD32 u4_left_intra_4x4_mode = DC_I4x4;
UWORD32 u4_top_intra_4x4_mode = DC_I4x4;
if (u4_pix_x == 0)
{
if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I4x4)
{
u4_left_intra_4x4_mode = ps_proc->au1_left_mb_intra_modes[u1_scan_order[3 + u4_pix_y]];
}
else if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I8x8)
{
u4_left_intra_4x4_mode = ps_proc->au1_left_mb_intra_modes[b8 + 1];
}
}
else
{
u4_left_intra_4x4_mode = ps_proc->au1_intra_luma_mb_4x4_modes[u1_scan_order[(u4_pix_x >> 2) + u4_pix_y - 1]];
}
if (u4_pix_y == 0)
{
if (ps_top_mb_syn_ele->u2_mb_type == I4x4)
{
u4_top_intra_4x4_mode = pu1_top_mb_intra_modes[u1_scan_order[12 + (u4_pix_x >> 2)]];
}
else if (ps_top_mb_syn_ele->u2_mb_type == I8x8)
{
u4_top_intra_4x4_mode = pu1_top_mb_intra_modes[b8 + 2];
}
}
else
{
u4_top_intra_4x4_mode = ps_proc->au1_intra_luma_mb_4x4_modes[u1_scan_order[(u4_pix_x >> 2) + u4_pix_y - 4]];
}
u4_estimated_intra_4x4_mode = MIN(u4_left_intra_4x4_mode, u4_top_intra_4x4_mode);
}
ps_proc->au1_predicted_intra_luma_mb_4x4_modes[(b8 << 2) + b4] = u4_estimated_intra_4x4_mode;
/* mode evaluation and prediction */
ps_codec->pf_ih264e_evaluate_intra_4x4_modes(pu1_mb_curr,
pu1_ngbr_pels_i4,
pu1_pred_mb, i4_src_strd,
i4_pred_strd, i4_ngbr_avbl,
&u4_best_intra_4x4_mode,
&i4_partition_cost_least,
u4_valid_intra_modes,
u4_lambda,
u4_estimated_intra_4x4_mode);
i4_partition_distortion_least = i4_partition_cost_least - ((u4_estimated_intra_4x4_mode == u4_best_intra_4x4_mode) ? u4_cost_one_bit : u4_cost_four_bits);
DEBUG("%d partition cost, %d intra mode\n", i4_partition_cost_least, u4_best_intra_4x4_mode);
/* macroblock distortion */
i4_total_distortion += i4_partition_distortion_least;
i4_total_cost += i4_partition_cost_least;
/* mb partition mode */
ps_proc->au1_intra_luma_mb_4x4_modes[(b8 << 2) + b4] = u4_best_intra_4x4_mode;
}
}
/* update the type of the mb if necessary */
if (i4_total_cost < ps_proc->i4_mb_cost)
{
ps_proc->i4_mb_cost = i4_total_cost;
ps_proc->i4_mb_distortion = i4_total_distortion;
ps_proc->u4_mb_type = I4x4;
}
return ;
}
/**
******************************************************************************
*
* @brief evaluate best intra 4x4 mode (rate distortion opt on)
*
* @par Description
* This function evaluates all the possible intra 4x4 modes and finds the mode
* that best represents the macro-block (least distortion) and occupies fewer
* bits in the bit-stream.
*
* @param[in] ps_proc_ctxt
* pointer to proc ctxt
*
* @remarks
* Ideally the cost of encoding a macroblock is calculated as
* (distortion + lambda*rate). Where distortion is SAD/SATD,... between the
* input block and the reconstructed block and rate is the number of bits taken
* to place the macroblock in the bit-stream. In this routine the rate does not
* exactly point to the total number of bits it takes, rather it points to header
* bits necessary for encoding the macroblock. Assuming the deltaQP, cbp bits
* and residual bits fall in to texture bits the number of bits taken to encoding
* mbtype is considered as rate, we compute cost. Further we will approximate
* the distortion as the deviation b/w input and the predicted block as opposed
* to input and reconstructed block.
*
* NOTE: As per the Document JVT-O079, for the whole intra 4x4 macroblock,
* 24*lambda is added to the SAD before comparison with the best SAD for
* inter prediction. This is an empirical value to prevent using too many intra
* blocks.
*
* @return none
*
******************************************************************************
*/
void ih264e_evaluate_intra4x4_modes_for_least_cost_rdopton(process_ctxt_t *ps_proc)
{
/* Codec Context */
codec_t *ps_codec = ps_proc->ps_codec;
/* SAD(distortion metric) of an 4x4 block */
WORD32 i4_partition_distortion_least = INT_MAX, i4_total_distortion = 0;
/* lambda */
UWORD32 u4_lambda = ps_proc->u4_lambda;
/* cost = distortion + lambda*rate */
WORD32 i4_partition_cost_least, i4_total_cost = (24 + 1) * u4_lambda;
/* cost due to mbtype */
UWORD32 u4_cost_one_bit = u4_lambda, u4_cost_four_bits = 4 * u4_lambda;
/* intra mode */
UWORD32 u4_best_intra_4x4_mode = DC_I4x4, u4_estimated_intra_4x4_mode;
/* neighbor pels for intra prediction */
UWORD8 *pu1_ngbr_pels_i4 = ps_proc->au1_ngbr_pels;
/* pointer to curr partition */
UWORD8 *pu1_mb_curr;
UWORD8 *pu1_mb_ref_left, *pu1_mb_ref_top;
UWORD8 *pu1_ref_mb_intra_4x4;
/* pointer to residual macro block */
WORD16 *pi2_res_mb = ps_proc->pi2_res_buf_intra_4x4;
/* pointer to prediction macro block */
UWORD8 *pu1_pred_mb = ps_proc->pu1_pred_mb;
/* strides */
WORD32 i4_src_strd = ps_proc->i4_src_strd;
WORD32 i4_pred_strd = ps_proc->i4_pred_strd;
WORD32 i4_ref_strd_left, i4_ref_strd_top;
/* neighbors left, top, top right, top left */
UWORD8 *pu1_mb_a;
UWORD8 *pu1_mb_b;
UWORD8 *pu1_mb_c;
UWORD8 *pu1_mb_d;
/* number of non zero coeffs*/
UWORD8 *pu1_nnz = (UWORD8 *)ps_proc->au4_nnz_intra_4x4;
/* quantization parameters */
quant_params_t *ps_qp_params = ps_proc->ps_qp_params[0];
/* neighbor availability */
WORD32 i4_ngbr_avbl;
block_neighbors_t s_ngbr_avbl;
/* temp vars */
UWORD32 i, b8, b4, u4_blk_x, u4_blk_y, u4_pix_x, u4_pix_y;
/* scan order inside 4x4 block */
const UWORD8 u1_scan_order[16] = {0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15};
/* ngbr sub mb modes */
UWORD8 *pu1_top_mb_intra_modes = ps_proc->pu1_top_mb_intra_modes + (ps_proc->i4_mb_x << 4);
mb_info_t *ps_top_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
mb_info_t *ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
/* valid intra modes map */
UWORD32 u4_valid_intra_modes;
UWORD16 u2_valid_modes[8] = {4, 262, 4, 262, 141, 399, 141, 511};
/* Dummy variable for 4x4 trans function */
WORD16 i2_dc_dummy;
UWORD8 u1_mb_a, u1_mb_b, u1_mb_c, u1_mb_d;
UWORD32 u4_constrained_intra_pred = ps_proc->ps_codec->s_cfg.u4_constrained_intra_pred;
/* compute ngbr availability for sub blks */
if (ps_proc->ps_ngbr_avbl->u1_mb_c)
{
ps_top_right_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + (ps_proc->i4_mb_x + 1);
}
/* left pels */
u1_mb_a = ((ps_proc->ps_ngbr_avbl->u1_mb_a)
&& (u4_constrained_intra_pred ? ps_proc->s_left_mb_syntax_ele.u2_is_intra : 1));
/* top pels */
u1_mb_b = ((ps_proc->ps_ngbr_avbl->u1_mb_b)
&& (u4_constrained_intra_pred ? ps_top_mb_syn_ele->u2_is_intra : 1));
/* topleft pels */
u1_mb_d = ((ps_proc->ps_ngbr_avbl->u1_mb_d)
&& (u4_constrained_intra_pred ? ps_proc->s_top_left_mb_syntax_ele.u2_is_intra : 1));
/* top right pels */
u1_mb_c = ((ps_proc->ps_ngbr_avbl->u1_mb_c)
&& (u4_constrained_intra_pred ? ps_top_right_mb_syn_ele->u2_is_intra : 1));
i4_ngbr_avbl = (u1_mb_a) + (u1_mb_d << 1) + (u1_mb_b << 2) + (u1_mb_c << 3);
memcpy(ps_proc->au1_ngbr_avbl_4x4_subblks, gau1_ih264_4x4_ngbr_avbl[i4_ngbr_avbl], 16);
for(b8 = 0; b8 < 4; b8++)
{
u4_blk_x = (b8 & 0x01) << 3;
u4_blk_y = (b8 >> 1) << 3;
for(b4 = 0; b4 < 4; b4++, pu1_nnz++, pi2_res_mb += MB_SIZE)
{
u4_pix_x = u4_blk_x + ((b4 & 0x01) << 2);
u4_pix_y = u4_blk_y + ((b4 >> 1) << 2);
pu1_ref_mb_intra_4x4 = ps_proc->pu1_ref_mb_intra_4x4 + u4_pix_x + (u4_pix_y * i4_pred_strd);
pu1_mb_curr = ps_proc->pu1_src_buf_luma + u4_pix_x + (u4_pix_y * i4_src_strd);
if (u4_pix_x == 0)
{
i4_ref_strd_left = ps_proc->i4_rec_strd;
pu1_mb_ref_left = ps_proc->pu1_rec_buf_luma + u4_pix_x + (u4_pix_y * i4_ref_strd_left);
}
else
{
i4_ref_strd_left = i4_pred_strd;
pu1_mb_ref_left = pu1_ref_mb_intra_4x4;
}
if (u4_pix_y == 0)
{
i4_ref_strd_top = ps_proc->i4_rec_strd;
pu1_mb_ref_top = ps_proc->pu1_rec_buf_luma + u4_pix_x + (u4_pix_y * i4_ref_strd_top);
}
else
{
i4_ref_strd_top = i4_pred_strd;
pu1_mb_ref_top = pu1_ref_mb_intra_4x4;
}
pu1_mb_a = pu1_mb_ref_left - 1; /* pointer to left macro block */
pu1_mb_b = pu1_mb_ref_top - i4_ref_strd_top; /* pointer to top macro block */
pu1_mb_c = pu1_mb_b + 4; /* pointer to top right macro block */
if (u4_pix_y == 0)
pu1_mb_d = pu1_mb_b - 1;
else
pu1_mb_d = pu1_mb_a - i4_ref_strd_left; /* pointer to top left macro block */
/* locating neighbors that are available for prediction */
/* TODO : update the neighbor availability information basing on constrained intra pred information */
/* TODO : i4_ngbr_avbl is only being used in DC mode. Can the DC mode be split in to distinct routines */
/* basing on neighbors available and hence evade the computation of neighbor availability totally. */
i4_ngbr_avbl = ps_proc->au1_ngbr_avbl_4x4_subblks[(b8 << 2) + b4];
s_ngbr_avbl.u1_mb_a = (i4_ngbr_avbl & 0x1);
s_ngbr_avbl.u1_mb_d = (i4_ngbr_avbl & 0x2) >> 1;
s_ngbr_avbl.u1_mb_b = (i4_ngbr_avbl & 0x4) >> 2;
s_ngbr_avbl.u1_mb_c = (i4_ngbr_avbl & 0x8) >> 3;
/* set valid intra modes for evaluation */
u4_valid_intra_modes = u2_valid_modes[i4_ngbr_avbl & 0x7];
/* if top partition is available and top right is not available for intra prediction, then */
/* padd top right samples using top sample and make top right also available */
/* i4_ngbr_avbl = (s_ngbr_avbl.u1_mb_a) + (s_ngbr_avbl.u1_mb_d << 1) + (s_ngbr_avbl.u1_mb_b << 2) + ((s_ngbr_avbl.u1_mb_b | s_ngbr_avbl.u1_mb_c) << 3); */
/* gather prediction pels from the neighbors */
if (s_ngbr_avbl.u1_mb_a)
{
for(i = 0; i < 4; i++)
pu1_ngbr_pels_i4[4 - 1 -i] = pu1_mb_a[i * i4_ref_strd_left];
}
else
{
memset(pu1_ngbr_pels_i4,0,4);
}
if(s_ngbr_avbl.u1_mb_b)
{
memcpy(pu1_ngbr_pels_i4 + 4 + 1, pu1_mb_b, 4);
}
else
{
memset(pu1_ngbr_pels_i4 + 4 + 1, 0, 4);
}
if (s_ngbr_avbl.u1_mb_d)
pu1_ngbr_pels_i4[4] = *pu1_mb_d;
else
pu1_ngbr_pels_i4[4] = 0;
if (s_ngbr_avbl.u1_mb_c)
{
memcpy(pu1_ngbr_pels_i4 + 8 + 1, pu1_mb_c, 4);
}
else if (s_ngbr_avbl.u1_mb_b)
{
memset(pu1_ngbr_pels_i4 + 8 + 1, pu1_ngbr_pels_i4[8], 4);
s_ngbr_avbl.u1_mb_c = s_ngbr_avbl.u1_mb_b;
}
i4_partition_cost_least = INT_MAX;
/* predict the intra 4x4 mode for the current partition (for evaluating cost) */
if (!s_ngbr_avbl.u1_mb_a || !s_ngbr_avbl.u1_mb_b)
{
u4_estimated_intra_4x4_mode = DC_I4x4;
}
else
{
UWORD32 u4_left_intra_4x4_mode = DC_I4x4;
UWORD32 u4_top_intra_4x4_mode = DC_I4x4;
if (u4_pix_x == 0)
{
if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I4x4)
{
u4_left_intra_4x4_mode = ps_proc->au1_left_mb_intra_modes[u1_scan_order[3 + u4_pix_y]];
}
else if (ps_proc->s_left_mb_syntax_ele.u2_mb_type == I8x8)
{
u4_left_intra_4x4_mode = ps_proc->au1_left_mb_intra_modes[b8 + 1];
}
}
else
{
u4_left_intra_4x4_mode = ps_proc->au1_intra_luma_mb_4x4_modes[u1_scan_order[(u4_pix_x >> 2) + u4_pix_y - 1]];
}
if (u4_pix_y == 0)
{
if (ps_top_mb_syn_ele->u2_mb_type == I4x4)
{
u4_top_intra_4x4_mode = pu1_top_mb_intra_modes[u1_scan_order[12 + (u4_pix_x >> 2)]];
}
else if (ps_top_mb_syn_ele->u2_mb_type == I8x8)
{
u4_top_intra_4x4_mode = pu1_top_mb_intra_modes[b8 + 2];
}
}
else
{
u4_top_intra_4x4_mode = ps_proc->au1_intra_luma_mb_4x4_modes[u1_scan_order[(u4_pix_x >> 2) + u4_pix_y - 4]];
}
u4_estimated_intra_4x4_mode = MIN(u4_left_intra_4x4_mode, u4_top_intra_4x4_mode);
}
ps_proc->au1_predicted_intra_luma_mb_4x4_modes[(b8 << 2) + b4] = u4_estimated_intra_4x4_mode;
/*mode evaluation and prediction*/
ps_codec->pf_ih264e_evaluate_intra_4x4_modes(pu1_mb_curr,
pu1_ngbr_pels_i4,
pu1_pred_mb, i4_src_strd,
i4_pred_strd, i4_ngbr_avbl,
&u4_best_intra_4x4_mode,
&i4_partition_cost_least,
u4_valid_intra_modes,
u4_lambda,
u4_estimated_intra_4x4_mode);
i4_partition_distortion_least = i4_partition_cost_least - ((u4_estimated_intra_4x4_mode == u4_best_intra_4x4_mode)?u4_cost_one_bit:u4_cost_four_bits);
DEBUG("%d partition cost, %d intra mode\n", i4_partition_cost_least, u4_best_intra_4x4_mode);
/* macroblock distortion */
i4_total_distortion += i4_partition_distortion_least;
i4_total_cost += i4_partition_cost_least;
/* mb partition mode */
ps_proc->au1_intra_luma_mb_4x4_modes[(b8 << 2) + b4] = u4_best_intra_4x4_mode;
/********************************************************/
/* error estimation, */
/* transform */
/* quantization */
/********************************************************/
ps_codec->pf_resi_trans_quant_4x4(pu1_mb_curr, pu1_pred_mb,
pi2_res_mb, i4_src_strd,
i4_pred_strd,
/* No op stride, this implies a buff of lenght 1x16 */
ps_qp_params->pu2_scale_mat,
ps_qp_params->pu2_thres_mat,
ps_qp_params->u1_qbits,
ps_qp_params->u4_dead_zone,
pu1_nnz, &i2_dc_dummy);
/********************************************************/
/* ierror estimation, */
/* itransform */
/* iquantization */
/********************************************************/
ps_codec->pf_iquant_itrans_recon_4x4(pi2_res_mb, pu1_pred_mb,
pu1_ref_mb_intra_4x4,
i4_pred_strd, i4_pred_strd,
ps_qp_params->pu2_iscale_mat,
ps_qp_params->pu2_weigh_mat,
ps_qp_params->u1_qp_div,
ps_proc->pv_scratch_buff, 0,
NULL);
}
}
/* update the type of the mb if necessary */
if (i4_total_cost < ps_proc->i4_mb_cost)
{
ps_proc->i4_mb_cost = i4_total_cost;
ps_proc->i4_mb_distortion = i4_total_distortion;
ps_proc->u4_mb_type = I4x4;
}
return ;
}
/**
******************************************************************************
*
* @brief
* evaluate best chroma intra 8x8 mode (rate distortion opt off)
*
* @par Description
* This function evaluates all the possible chroma intra 8x8 modes and finds
* the mode that best represents the macroblock (least distortion) and occupies
* fewer bits in the bitstream.
*
* @param[in] ps_proc_ctxt
* pointer to macroblock context (handle)
*
* @remarks
* For chroma best intra pred mode is calculated based only on SAD
*
* @returns none
*
******************************************************************************
*/
void ih264e_evaluate_chroma_intra8x8_modes_for_least_cost_rdoptoff(process_ctxt_t *ps_proc)
{
/* Codec Context */
codec_t *ps_codec = ps_proc->ps_codec;
/* SAD(distortion metric) of an 8x8 block */
WORD32 i4_mb_distortion, i4_chroma_mb_distortion;
/* intra mode */
UWORD32 u4_best_chroma_intra_8x8_mode = DC_CH_I8x8;
/* neighbor pels for intra prediction */
UWORD8 *pu1_ngbr_pels_c_i8x8 = ps_proc->au1_ngbr_pels;
/* pointer to curr macro block */
UWORD8 *pu1_curr_mb = ps_proc->pu1_src_buf_chroma;
UWORD8 *pu1_ref_mb = ps_proc->pu1_rec_buf_chroma;
/* pointer to prediction macro block */
UWORD8 *pu1_pred_mb = ps_proc->pu1_pred_mb_intra_chroma;
UWORD8 *pu1_pred_mb_plane = ps_proc->pu1_pred_mb_intra_chroma_plane;
/* strides */
WORD32 i4_src_strd_c = ps_proc->i4_src_chroma_strd;
WORD32 i4_pred_strd = ps_proc->i4_pred_strd;
WORD32 i4_rec_strd_c = ps_proc->i4_rec_strd;
/* neighbors left, top, top left */
UWORD8 *pu1_mb_a = pu1_ref_mb - 2;
UWORD8 *pu1_mb_b = pu1_ref_mb - i4_rec_strd_c;
UWORD8 *pu1_mb_d = pu1_mb_b - 2;
/* neighbor availability */
const UWORD8 u1_valid_intra_modes[8] = {1, 3, 1, 3, 5, 7, 5, 15};
WORD32 i4_ngbr_avbl;
/* valid intra modes map */
UWORD32 u4_valid_intra_modes;
mb_info_t *ps_top_mb_syn_ele = ps_proc->ps_top_row_mb_syntax_ele + ps_proc->i4_mb_x;
/* temp var */
UWORD8 i;
UWORD32 u4_constrained_intra_pred = ps_proc->ps_codec->s_cfg.u4_constrained_intra_pred;
UWORD8 u1_mb_a, u1_mb_b, u1_mb_d;
/* locating neighbors that are available for prediction */
/* gather prediction pels from the neighbors */
/* left pels */
u1_mb_a = ((ps_proc->ps_ngbr_avbl->u1_mb_a)
&& (u4_constrained_intra_pred ? ps_proc->s_left_mb_syntax_ele.u2_is_intra : 1));
if (u1_mb_a)
{
for (i = 0; i < 16; i += 2)
{
pu1_ngbr_pels_c_i8x8[16 - 2 - i] = pu1_mb_a[(i / 2) * i4_rec_strd_c];
pu1_ngbr_pels_c_i8x8[16 - 1 - i] = pu1_mb_a[(i / 2) * i4_rec_strd_c + 1];
}
}
else
{
ps_codec->pf_mem_set_mul8(pu1_ngbr_pels_c_i8x8, 0, MB_SIZE);
}
/* top pels */
u1_mb_b = ((ps_proc->ps_ngbr_avbl->u1_mb_b)
&& (u4_constrained_intra_pred ? ps_top_mb_syn_ele->u2_is_intra : 1));
if (u1_mb_b)
{
ps_codec->pf_mem_cpy_mul8(&pu1_ngbr_pels_c_i8x8[18], pu1_mb_b, 16);
}
else
{
ps_codec->pf_mem_set_mul8((pu1_ngbr_pels_c_i8x8 + 18), 0, MB_SIZE);
}
/* top left pels */
u1_mb_d = ((ps_proc->ps_ngbr_avbl->u1_mb_d)
&& (u4_constrained_intra_pred ? ps_proc->s_top_left_mb_syntax_ele.u2_is_intra : 1));
if (u1_mb_d)
{
pu1_ngbr_pels_c_i8x8[16] = *pu1_mb_d;
pu1_ngbr_pels_c_i8x8[17] = *(pu1_mb_d + 1);
}
i4_ngbr_avbl = (u1_mb_a) + (u1_mb_b << 2) + (u1_mb_d << 1);
ps_proc->i4_chroma_neighbor_avail_8x8_mb = i4_ngbr_avbl;
u4_valid_intra_modes = u1_valid_intra_modes[i4_ngbr_avbl];
if (ps_codec->s_cfg.u4_enc_speed_preset == IVE_FAST ||
ps_codec->s_cfg.u4_enc_speed_preset == IVE_FASTEST)
u4_valid_intra_modes &= ~(1 << PLANE_CH_I8x8);
i4_chroma_mb_distortion = INT_MAX;
/* perform intra mode chroma 8x8 evaluation */
/* intra prediction */
ps_codec->pf_ih264e_evaluate_intra_chroma_modes(pu1_curr_mb,
pu1_ngbr_pels_c_i8x8,
pu1_pred_mb,
i4_src_strd_c,
i4_pred_strd,
i4_ngbr_avbl,
&u4_best_chroma_intra_8x8_mode,
&i4_chroma_mb_distortion,
u4_valid_intra_modes);
if (u4_valid_intra_modes & 8)/* if Chroma PLANE is valid*/
{
(ps_codec->apf_intra_pred_c)[PLANE_CH_I8x8](pu1_ngbr_pels_c_i8x8, pu1_pred_mb_plane, 0, i4_pred_strd, i4_ngbr_avbl);
/* evaluate distortion(sad) */
ps_codec->pf_compute_sad_16x8(pu1_curr_mb, pu1_pred_mb_plane, i4_src_strd_c, i4_pred_strd, i4_chroma_mb_distortion, &i4_mb_distortion);
/* update the least distortion information if necessary */
if(i4_mb_distortion < i4_chroma_mb_distortion)
{
i4_chroma_mb_distortion = i4_mb_distortion;
u4_best_chroma_intra_8x8_mode = PLANE_CH_I8x8;
}
}
DEBUG("%d partition cost, %d intra mode\n", i4_chroma_mb_distortion, u4_best_chroma_intra_8x8_mode);
ps_proc->u1_c_i8_mode = u4_best_chroma_intra_8x8_mode;
return ;
}
/**
******************************************************************************
*
* @brief
* Evaluate best intra 16x16 mode (among VERT, HORZ and DC) and do the
* prediction.
*
* @par Description
* This function evaluates first three 16x16 modes and compute corresponding sad
* and return the buffer predicted with best mode.
*
* @param[in] pu1_src
* UWORD8 pointer to the source
*
* @param[in] pu1_ngbr_pels_i16
* UWORD8 pointer to neighbouring pels
*
* @param[out] pu1_dst
* UWORD8 pointer to the destination
*
* @param[in] src_strd
* integer source stride
*
* @param[in] dst_strd
* integer destination stride
*
* @param[in] u4_n_avblty
* availability of neighbouring pixels
*
* @param[in] u4_intra_mode
* Pointer to the variable in which best mode is returned
*
* @param[in] pu4_sadmin
* Pointer to the variable in which minimum sad is returned
*
* @param[in] u4_valid_intra_modes
* Says what all modes are valid
*
* @returns none
*
******************************************************************************
*/
void ih264e_evaluate_intra16x16_modes(UWORD8 *pu1_src,
UWORD8 *pu1_ngbr_pels_i16,
UWORD8 *pu1_dst,
UWORD32 src_strd,
UWORD32 dst_strd,
WORD32 u4_n_avblty,
UWORD32 *u4_intra_mode,
WORD32 *pu4_sadmin,
UWORD32 u4_valid_intra_modes)
{
UWORD8 *pu1_neighbour;
UWORD8 *pu1_src_temp = pu1_src;
UWORD8 left = 0, top = 0;
WORD32 u4_dcval = 0;
WORD32 i, j;
WORD32 i4_sad_vert = INT_MAX, i4_sad_horz = INT_MAX, i4_sad_dc = INT_MAX,
i4_min_sad = INT_MAX;
UWORD8 val;
left = (u4_n_avblty & LEFT_MB_AVAILABLE_MASK);
top = (u4_n_avblty & TOP_MB_AVAILABLE_MASK) >> 2;
/* left available */
if (left)
{
i4_sad_horz = 0;
for (i = 0; i < 16; i++)
{
val = pu1_ngbr_pels_i16[15 - i];
u4_dcval += val;
for (j = 0; j < 16; j++)
{
i4_sad_horz += ABS(val - pu1_src_temp[j]);
}
pu1_src_temp += src_strd;
}
u4_dcval += 8;
}
pu1_src_temp = pu1_src;
/* top available */
if (top)
{
i4_sad_vert = 0;
for (i = 0; i < 16; i++)
{
u4_dcval += pu1_ngbr_pels_i16[17 + i];
for (j = 0; j < 16; j++)
{
i4_sad_vert += ABS(pu1_ngbr_pels_i16[17 + j] - pu1_src_temp[j]);
}
pu1_src_temp += src_strd;
}
u4_dcval += 8;
}
u4_dcval = (u4_dcval) >> (3 + left + top);
pu1_src_temp = pu1_src;
/* none available */
u4_dcval += (left == 0) * (top == 0) * 128;
i4_sad_dc = 0;
for (i = 0; i < 16; i++)
{
for (j = 0; j < 16; j++)
{
i4_sad_dc += ABS(u4_dcval - pu1_src_temp[j]);
}
pu1_src_temp += src_strd;
}
if ((u4_valid_intra_modes & 04) == 0)/* If DC is disabled */
i4_sad_dc = INT_MAX;
if ((u4_valid_intra_modes & 01) == 0)/* If VERT is disabled */
i4_sad_vert = INT_MAX;
if ((u4_valid_intra_modes & 02) == 0)/* If HORZ is disabled */
i4_sad_horz = INT_MAX;
i4_min_sad = MIN3(i4_sad_horz, i4_sad_dc, i4_sad_vert);
/* Finding Minimum sad and doing corresponding prediction */
if (i4_min_sad < *pu4_sadmin)
{
*pu4_sadmin = i4_min_sad;
if (i4_min_sad == i4_sad_vert)
{
*u4_intra_mode = VERT_I16x16;
pu1_neighbour = pu1_ngbr_pels_i16 + 17;
for (j = 0; j < 16; j++)
{
memcpy(pu1_dst, pu1_neighbour, MB_SIZE);
pu1_dst += dst_strd;
}
}
else if (i4_min_sad == i4_sad_horz)
{
*u4_intra_mode = HORZ_I16x16;
for (j = 0; j < 16; j++)
{
val = pu1_ngbr_pels_i16[15 - j];
memset(pu1_dst, val, MB_SIZE);
pu1_dst += dst_strd;
}
}
else
{
*u4_intra_mode = DC_I16x16;
for (j = 0; j < 16; j++)
{
memset(pu1_dst, u4_dcval, MB_SIZE);
pu1_dst += dst_strd;
}
}
}
return;
}
/**
******************************************************************************
*
* @brief
* Evaluate best intra 4x4 mode and perform prediction.
*
* @par Description
* This function evaluates 4x4 modes and compute corresponding sad
* and return the buffer predicted with best mode.
*
* @param[in] pu1_src
* UWORD8 pointer to the source
*
* @param[in] pu1_ngbr_pels
* UWORD8 pointer to neighbouring pels
*
* @param[out] pu1_dst
* UWORD8 pointer to the destination
*
* @param[in] src_strd
* integer source stride
*
* @param[in] dst_strd
* integer destination stride
*
* @param[in] u4_n_avblty
* availability of neighbouring pixels
*
* @param[in] u4_intra_mode
* Pointer to the variable in which best mode is returned
*
* @param[in] pu4_sadmin
* Pointer to the variable in which minimum cost is returned
*
* @param[in] u4_valid_intra_modes
* Says what all modes are valid
*
* @param[in] u4_lambda
* Lamda value for computing cost from SAD
*
* @param[in] u4_predictd_mode
* Predicted mode for cost computation
*
* @returns none
*
******************************************************************************
*/
void ih264e_evaluate_intra_4x4_modes(UWORD8 *pu1_src,
UWORD8 *pu1_ngbr_pels,
UWORD8 *pu1_dst,
UWORD32 src_strd,
UWORD32 dst_strd,
WORD32 u4_n_avblty,
UWORD32 *u4_intra_mode,
WORD32 *pu4_sadmin,
UWORD32 u4_valid_intra_modes,
UWORD32 u4_lambda,
UWORD32 u4_predictd_mode)
{
UWORD8 *pu1_src_temp = pu1_src;
UWORD8 *pu1_pred = pu1_ngbr_pels;
UWORD8 left = 0, top = 0;
UWORD8 u1_pred_val = 0;
UWORD8 u1_pred_vals[4] = {0};
UWORD8 *pu1_pred_val = NULL;
/* To store FILT121 operated values*/
UWORD8 u1_pred_vals_diag_121[15] = {0};
/* To store FILT11 operated values*/
UWORD8 u1_pred_vals_diag_11[15] = {0};
UWORD8 u1_pred_vals_vert_r[8] = {0};
UWORD8 u1_pred_vals_horz_d[10] = {0};
UWORD8 u1_pred_vals_horz_u[10] = {0};
WORD32 u4_dcval = 0;
WORD32 i4_sad[MAX_I4x4] = {INT_MAX, INT_MAX, INT_MAX, INT_MAX, INT_MAX,
INT_MAX, INT_MAX, INT_MAX, INT_MAX};
WORD32 i4_cost[MAX_I4x4] = {INT_MAX, INT_MAX, INT_MAX, INT_MAX, INT_MAX,
INT_MAX, INT_MAX, INT_MAX, INT_MAX};
WORD32 i, i4_min_cost = INT_MAX;
left = (u4_n_avblty & LEFT_MB_AVAILABLE_MASK);
top = (u4_n_avblty & TOP_MB_AVAILABLE_MASK) >> 2;
/* Computing SAD */
/* VERT mode valid */
if (u4_valid_intra_modes & 1)
{
pu1_pred = pu1_ngbr_pels + 5;
i4_sad[VERT_I4x4] = 0;
i4_cost[VERT_I4x4] = 0;
USADA8(pu1_src_temp, pu1_pred, i4_sad[VERT_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, pu1_pred, i4_sad[VERT_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, pu1_pred, i4_sad[VERT_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, pu1_pred, i4_sad[VERT_I4x4]);
i4_cost[VERT_I4x4] = i4_sad[VERT_I4x4] + ((u4_predictd_mode == VERT_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
/* HORZ mode valid */
if (u4_valid_intra_modes & 2)
{
i4_sad[HORZ_I4x4] = 0;
i4_cost[HORZ_I4x4] =0;
pu1_src_temp = pu1_src;
u1_pred_val = pu1_ngbr_pels[3];
i4_sad[HORZ_I4x4] += ABS(pu1_src_temp[0] - u1_pred_val)
+ ABS(pu1_src_temp[1] - u1_pred_val)
+ ABS(pu1_src_temp[2] - u1_pred_val)
+ ABS(pu1_src_temp[3] - u1_pred_val);
pu1_src_temp += src_strd;
u1_pred_val = pu1_ngbr_pels[2];
i4_sad[HORZ_I4x4] += ABS(pu1_src_temp[0] - u1_pred_val)
+ ABS(pu1_src_temp[1] - u1_pred_val)
+ ABS(pu1_src_temp[2] - u1_pred_val)
+ ABS(pu1_src_temp[3] - u1_pred_val);
pu1_src_temp += src_strd;
u1_pred_val = pu1_ngbr_pels[1];
i4_sad[HORZ_I4x4] += ABS(pu1_src_temp[0] - u1_pred_val)
+ ABS(pu1_src_temp[1] - u1_pred_val)
+ ABS(pu1_src_temp[2] - u1_pred_val)
+ ABS(pu1_src_temp[3] - u1_pred_val);
pu1_src_temp += src_strd;
u1_pred_val = pu1_ngbr_pels[0];
i4_sad[HORZ_I4x4] += ABS(pu1_src_temp[0] - u1_pred_val)
+ ABS(pu1_src_temp[1] - u1_pred_val)
+ ABS(pu1_src_temp[2] - u1_pred_val)
+ ABS(pu1_src_temp[3] - u1_pred_val);
i4_cost[HORZ_I4x4] = i4_sad[HORZ_I4x4] + ((u4_predictd_mode == HORZ_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
/* DC mode valid */
if (u4_valid_intra_modes & 4)
{
i4_sad[DC_I4x4] = 0;
i4_cost[DC_I4x4] = 0;
pu1_src_temp = pu1_src;
if (left)
u4_dcval = pu1_ngbr_pels[0] + pu1_ngbr_pels[1] + pu1_ngbr_pels[2]
+ pu1_ngbr_pels[3] + 2;
if (top)
u4_dcval += pu1_ngbr_pels[5] + pu1_ngbr_pels[6] + pu1_ngbr_pels[7]
+ pu1_ngbr_pels[8] + 2;
u4_dcval = (u4_dcval) ? (u4_dcval >> (1 + left + top)) : 128;
/* none available */
memset(u1_pred_vals, u4_dcval, 4);
USADA8(pu1_src_temp, u1_pred_vals, i4_sad[DC_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, u1_pred_vals, i4_sad[DC_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, u1_pred_vals, i4_sad[DC_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, u1_pred_vals, i4_sad[DC_I4x4]);
pu1_src_temp += src_strd;
i4_cost[DC_I4x4] = i4_sad[DC_I4x4] + ((u4_predictd_mode == DC_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
/* if modes other than VERT, HORZ and DC are valid */
if (u4_valid_intra_modes > 7)
{
pu1_pred = pu1_ngbr_pels;
pu1_pred[13] = pu1_pred[14] = pu1_pred[12];
/* Performing FILT121 and FILT11 operation for all neighbour values*/
for (i = 0; i < 13; i++)
{
u1_pred_vals_diag_121[i] = FILT121(pu1_pred[0], pu1_pred[1], pu1_pred[2]);
u1_pred_vals_diag_11[i] = FILT11(pu1_pred[0], pu1_pred[1]);
pu1_pred++;
}
if (u4_valid_intra_modes & 8)/* DIAG_DL */
{
i4_sad[DIAG_DL_I4x4] = 0;
i4_cost[DIAG_DL_I4x4] = 0;
pu1_src_temp = pu1_src;
pu1_pred_val = u1_pred_vals_diag_121 + 5;
USADA8(pu1_src_temp, pu1_pred_val, i4_sad[DIAG_DL_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 1), i4_sad[DIAG_DL_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 2), i4_sad[DIAG_DL_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 3), i4_sad[DIAG_DL_I4x4]);
pu1_src_temp += src_strd;
i4_cost[DIAG_DL_I4x4] = i4_sad[DIAG_DL_I4x4] + ((u4_predictd_mode == DIAG_DL_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
if (u4_valid_intra_modes & 16)/* DIAG_DR */
{
i4_sad[DIAG_DR_I4x4] = 0;
i4_cost[DIAG_DR_I4x4] = 0;
pu1_src_temp = pu1_src;
pu1_pred_val = u1_pred_vals_diag_121 + 3;
USADA8(pu1_src_temp, pu1_pred_val, i4_sad[DIAG_DR_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val - 1), i4_sad[DIAG_DR_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val - 2), i4_sad[DIAG_DR_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val - 3), i4_sad[DIAG_DR_I4x4]);
pu1_src_temp += src_strd;
i4_cost[DIAG_DR_I4x4] = i4_sad[DIAG_DR_I4x4] + ((u4_predictd_mode == DIAG_DR_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
if (u4_valid_intra_modes & 32)/* VERT_R mode valid ????*/
{
i4_sad[VERT_R_I4x4] = 0;
pu1_src_temp = pu1_src;
u1_pred_vals_vert_r[0] = u1_pred_vals_diag_121[2];
memcpy((u1_pred_vals_vert_r + 1), (u1_pred_vals_diag_11 + 4), 3);
u1_pred_vals_vert_r[4] = u1_pred_vals_diag_121[1];
memcpy((u1_pred_vals_vert_r + 5), (u1_pred_vals_diag_121 + 3), 3);
pu1_pred_val = u1_pred_vals_diag_11 + 4;
USADA8(pu1_src_temp, pu1_pred_val, i4_sad[VERT_R_I4x4]);
pu1_pred_val = u1_pred_vals_diag_121 + 3;
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, pu1_pred_val, i4_sad[VERT_R_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (u1_pred_vals_vert_r), i4_sad[VERT_R_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (u1_pred_vals_vert_r + 4),
i4_sad[VERT_R_I4x4]);
i4_cost[VERT_R_I4x4] = i4_sad[VERT_R_I4x4] + ((u4_predictd_mode == VERT_R_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
if (u4_valid_intra_modes & 64)/* HORZ_D mode valid ????*/
{
i4_sad[HORZ_D_I4x4] = 0;
pu1_src_temp = pu1_src;
u1_pred_vals_horz_d[6] = u1_pred_vals_diag_11[3];
memcpy((u1_pred_vals_horz_d + 7), (u1_pred_vals_diag_121 + 3), 3);
u1_pred_vals_horz_d[0] = u1_pred_vals_diag_11[0];
u1_pred_vals_horz_d[1] = u1_pred_vals_diag_121[0];
u1_pred_vals_horz_d[2] = u1_pred_vals_diag_11[1];
u1_pred_vals_horz_d[3] = u1_pred_vals_diag_121[1];
u1_pred_vals_horz_d[4] = u1_pred_vals_diag_11[2];
u1_pred_vals_horz_d[5] = u1_pred_vals_diag_121[2];
pu1_pred_val = u1_pred_vals_horz_d;
USADA8(pu1_src_temp, (pu1_pred_val + 6), i4_sad[HORZ_D_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 4), i4_sad[HORZ_D_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 2), i4_sad[HORZ_D_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[HORZ_D_I4x4]);
i4_cost[HORZ_D_I4x4] = i4_sad[HORZ_D_I4x4] + ((u4_predictd_mode == HORZ_D_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
if (u4_valid_intra_modes & 128)/* VERT_L mode valid ????*/
{
i4_sad[VERT_L_I4x4] = 0;
pu1_src_temp = pu1_src;
pu1_pred_val = u1_pred_vals_diag_11 + 5;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[VERT_L_I4x4]);
pu1_src_temp += src_strd;
pu1_pred_val = u1_pred_vals_diag_121 + 5;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[VERT_L_I4x4]);
pu1_src_temp += src_strd;
pu1_pred_val = u1_pred_vals_diag_11 + 6;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[VERT_L_I4x4]);
pu1_src_temp += src_strd;
pu1_pred_val = u1_pred_vals_diag_121 + 6;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[VERT_L_I4x4]);
i4_cost[VERT_L_I4x4] = i4_sad[VERT_L_I4x4] + ((u4_predictd_mode == VERT_L_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
if (u4_valid_intra_modes & 256)/* HORZ_U mode valid ????*/
{
i4_sad[HORZ_U_I4x4] = 0;
pu1_src_temp = pu1_src;
u1_pred_vals_horz_u[0] = u1_pred_vals_diag_11[2];
u1_pred_vals_horz_u[1] = u1_pred_vals_diag_121[1];
u1_pred_vals_horz_u[2] = u1_pred_vals_diag_11[1];
u1_pred_vals_horz_u[3] = u1_pred_vals_diag_121[0];
u1_pred_vals_horz_u[4] = u1_pred_vals_diag_11[0];
u1_pred_vals_horz_u[5] = FILT121(pu1_ngbr_pels[0], pu1_ngbr_pels[0], pu1_ngbr_pels[1]);
memset((u1_pred_vals_horz_u + 6), pu1_ngbr_pels[0], 4);
pu1_pred_val = u1_pred_vals_horz_u;
USADA8(pu1_src_temp, (pu1_pred_val), i4_sad[HORZ_U_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 2), i4_sad[HORZ_U_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 4), i4_sad[HORZ_U_I4x4]);
pu1_src_temp += src_strd;
USADA8(pu1_src_temp, (pu1_pred_val + 6), i4_sad[HORZ_U_I4x4]);
i4_cost[HORZ_U_I4x4] = i4_sad[HORZ_U_I4x4] + ((u4_predictd_mode == HORZ_U_I4x4) ?
u4_lambda : 4 * u4_lambda);
}
i4_min_cost = MIN3(MIN3(i4_cost[0], i4_cost[1], i4_cost[2]),
MIN3(i4_cost[3], i4_cost[4], i4_cost[5]),
MIN3(i4_cost[6], i4_cost[7], i4_cost[8]));
}
else
{
/* Only first three modes valid */
i4_min_cost = MIN3(i4_cost[0], i4_cost[1], i4_cost[2]);
}
*pu4_sadmin = i4_min_cost;
if (i4_min_cost == i4_cost[0])
{
*u4_intra_mode = VERT_I4x4;
pu1_pred_val = pu1_ngbr_pels + 5;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val), 4);
}
else if (i4_min_cost == i4_cost[1])
{
*u4_intra_mode = HORZ_I4x4;
memset(pu1_dst, pu1_ngbr_pels[3], 4);
pu1_dst += dst_strd;
memset(pu1_dst, pu1_ngbr_pels[2], 4);
pu1_dst += dst_strd;
memset(pu1_dst, pu1_ngbr_pels[1], 4);
pu1_dst += dst_strd;
memset(pu1_dst, pu1_ngbr_pels[0], 4);
}
else if (i4_min_cost == i4_cost[2])
{
*u4_intra_mode = DC_I4x4;
memset(pu1_dst, u4_dcval, 4);
pu1_dst += dst_strd;
memset(pu1_dst, u4_dcval, 4);
pu1_dst += dst_strd;
memset(pu1_dst, u4_dcval, 4);
pu1_dst += dst_strd;
memset(pu1_dst, u4_dcval, 4);
}
else if (i4_min_cost == i4_cost[3])
{
*u4_intra_mode = DIAG_DL_I4x4;
pu1_pred_val = u1_pred_vals_diag_121 + 5;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 1), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 2), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 3), 4);
}
else if (i4_min_cost == i4_cost[4])
{
*u4_intra_mode = DIAG_DR_I4x4;
pu1_pred_val = u1_pred_vals_diag_121 + 3;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val - 1), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val - 2), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val - 3), 4);
}
else if (i4_min_cost == i4_cost[5])
{
*u4_intra_mode = VERT_R_I4x4;
pu1_pred_val = u1_pred_vals_diag_11 + 4;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
pu1_pred_val = u1_pred_vals_diag_121 + 3;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (u1_pred_vals_vert_r), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (u1_pred_vals_vert_r + 4), 4);
}
else if (i4_min_cost == i4_cost[6])
{
*u4_intra_mode = HORZ_D_I4x4;
pu1_pred_val = u1_pred_vals_horz_d;
memcpy(pu1_dst, (pu1_pred_val + 6), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 4), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 2), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
}
else if (i4_min_cost == i4_cost[7])
{
*u4_intra_mode = VERT_L_I4x4;
pu1_pred_val = u1_pred_vals_diag_11 + 5;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
pu1_pred_val = u1_pred_vals_diag_121 + 5;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
pu1_pred_val = u1_pred_vals_diag_11 + 6;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
pu1_pred_val = u1_pred_vals_diag_121 + 6;
memcpy(pu1_dst, (pu1_pred_val), 4);
}
else if (i4_min_cost == i4_cost[8])
{
*u4_intra_mode = HORZ_U_I4x4;
pu1_pred_val = u1_pred_vals_horz_u;
memcpy(pu1_dst, (pu1_pred_val), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 2), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 4), 4);
pu1_dst += dst_strd;
memcpy(pu1_dst, (pu1_pred_val + 6), 4);
pu1_dst += dst_strd;
}
return;
}
/**
******************************************************************************
*
* @brief:
* Evaluate best intr chroma mode (among VERT, HORZ and DC ) and do the prediction.
*
* @par Description
* This function evaluates first three intra chroma modes and compute corresponding sad
* and return the buffer predicted with best mode.
*
* @param[in] pu1_src
* UWORD8 pointer to the source
*
* @param[in] pu1_ngbr_pels
* UWORD8 pointer to neighbouring pels
*
* @param[out] pu1_dst
* UWORD8 pointer to the destination
*
* @param[in] src_strd
* integer source stride
*
* @param[in] dst_strd
* integer destination stride
*
* @param[in] u4_n_avblty
* availability of neighbouring pixels
*
* @param[in] u4_intra_mode
* Pointer to the variable in which best mode is returned
*
* @param[in] pu4_sadmin
* Pointer to the variable in which minimum sad is returned
*
* @param[in] u4_valid_intra_modes
* Says what all modes are valid
*
* @return none
*
******************************************************************************
*/
void ih264e_evaluate_intra_chroma_modes(UWORD8 *pu1_src,
UWORD8 *pu1_ngbr_pels,
UWORD8 *pu1_dst,
UWORD32 src_strd,
UWORD32 dst_strd,
WORD32 u4_n_avblty,
UWORD32 *u4_intra_mode,
WORD32 *pu4_sadmin,
UWORD32 u4_valid_intra_modes)
{
UWORD8 *pu1_neighbour;
UWORD8 *pu1_src_temp = pu1_src;
UWORD8 left = 0, top = 0;
WORD32 u4_dcval_u_l[2] = { 0, 0 }, /*sum left neighbours for 'U' ,two separate sets - sum of first four from top,and sum of four values from bottom */
u4_dcval_u_t[2] = { 0, 0 }; /*sum top neighbours for 'U'*/
WORD32 u4_dcval_v_l[2] = { 0, 0 }, /*sum left neighbours for 'V'*/
u4_dcval_v_t[2] = { 0, 0 }; /*sum top neighbours for 'V'*/
WORD32 i, j, row, col, i4_sad_vert = INT_MAX, i4_sad_horz = INT_MAX,
i4_sad_dc = INT_MAX, i4_min_sad = INT_MAX;
UWORD8 val_u, val_v;
WORD32 u4_dc_val[2][2][2];/* -----------
| | | Chroma can have four
| 00 | 01 | separate dc value...
----------- u4_dc_val corresponds to this dc values
| | | with u4_dc_val[2][2][U] and u4_dc_val[2][2][V]
| 10 | 11 |
----------- */
left = (u4_n_avblty & LEFT_MB_AVAILABLE_MASK);
top = (u4_n_avblty & TOP_MB_AVAILABLE_MASK) >> 2;
/*Evaluating HORZ*/
if (left)/* Ifleft available*/
{
i4_sad_horz = 0;
for (i = 0; i < 8; i++)
{
val_v = pu1_ngbr_pels[15 - 2 * i];
val_u = pu1_ngbr_pels[15 - 2 * i - 1];
row = i / 4;
u4_dcval_u_l[row] += val_u;
u4_dcval_v_l[row] += val_v;
for (j = 0; j < 8; j++)
{
i4_sad_horz += ABS(val_u - pu1_src_temp[2 * j]);/* Finding SAD for HORZ mode*/
i4_sad_horz += ABS(val_v - pu1_src_temp[2 * j + 1]);
}
pu1_src_temp += src_strd;
}
u4_dcval_u_l[0] += 2;
u4_dcval_u_l[1] += 2;
u4_dcval_v_l[0] += 2;
u4_dcval_v_l[1] += 2;
}
/*Evaluating VERT**/
pu1_src_temp = pu1_src;
if (top) /* top available*/
{
i4_sad_vert = 0;
for (i = 0; i < 8; i++)
{
col = i / 4;
val_u = pu1_ngbr_pels[18 + i * 2];
val_v = pu1_ngbr_pels[18 + i * 2 + 1];
u4_dcval_u_t[col] += val_u;
u4_dcval_v_t[col] += val_v;
for (j = 0; j < 16; j++)
{
i4_sad_vert += ABS(pu1_ngbr_pels[18 + j] - pu1_src_temp[j]);/* Finding SAD for VERT mode*/
}
pu1_src_temp += src_strd;
}
u4_dcval_u_t[0] += 2;
u4_dcval_u_t[1] += 2;
u4_dcval_v_t[0] += 2;
u4_dcval_v_t[1] += 2;
}
/* computing DC value*/
/* Equation 8-128 in spec*/
u4_dc_val[0][0][0] = (u4_dcval_u_l[0] + u4_dcval_u_t[0]) >> (1 + left + top);
u4_dc_val[0][0][1] = (u4_dcval_v_l[0] + u4_dcval_v_t[0]) >> (1 + left + top);
u4_dc_val[1][1][0] = (u4_dcval_u_l[1] + u4_dcval_u_t[1]) >> (1 + left + top);
u4_dc_val[1][1][1] = (u4_dcval_v_l[1] + u4_dcval_v_t[1]) >> (1 + left + top);
if (top)
{
/* Equation 8-132 in spec*/
u4_dc_val[0][1][0] = (u4_dcval_u_t[1]) >> (1 + top);
u4_dc_val[0][1][1] = (u4_dcval_v_t[1]) >> (1 + top);
}
else
{
u4_dc_val[0][1][0] = (u4_dcval_u_l[0]) >> (1 + left);
u4_dc_val[0][1][1] = (u4_dcval_v_l[0]) >> (1 + left);
}
if (left)
{
u4_dc_val[1][0][0] = (u4_dcval_u_l[1]) >> (1 + left);
u4_dc_val[1][0][1] = (u4_dcval_v_l[1]) >> (1 + left);
}
else
{
u4_dc_val[1][0][0] = (u4_dcval_u_t[0]) >> (1 + top);
u4_dc_val[1][0][1] = (u4_dcval_v_t[0]) >> (1 + top);
}
if (!(left || top))
{
/*none available*/
u4_dc_val[0][0][0] = u4_dc_val[0][0][1] =
u4_dc_val[0][1][0] = u4_dc_val[0][1][1] =
u4_dc_val[1][0][0] = u4_dc_val[1][0][1] =
u4_dc_val[1][1][0] = u4_dc_val[1][1][1] = 128;
}
/* Evaluating DC */
pu1_src_temp = pu1_src;
i4_sad_dc = 0;
for (i = 0; i < 8; i++)
{
for (j = 0; j < 8; j++)
{
col = j / 4;
row = i / 4;
val_u = u4_dc_val[row][col][0];
val_v = u4_dc_val[row][col][1];
i4_sad_dc += ABS(val_u - pu1_src_temp[2 * j]);/* Finding SAD for DC mode*/
i4_sad_dc += ABS(val_v - pu1_src_temp[2 * j + 1]);
}
pu1_src_temp += src_strd;
}
if ((u4_valid_intra_modes & 01) == 0)/* If DC is disabled*/
i4_sad_dc = INT_MAX;
if ((u4_valid_intra_modes & 02) == 0)/* If HORZ is disabled*/
i4_sad_horz = INT_MAX;
if ((u4_valid_intra_modes & 04) == 0)/* If VERT is disabled*/
i4_sad_vert = INT_MAX;
i4_min_sad = MIN3(i4_sad_horz, i4_sad_dc, i4_sad_vert);
/* Finding Minimum sad and doing corresponding prediction*/
if (i4_min_sad < *pu4_sadmin)
{
*pu4_sadmin = i4_min_sad;
if (i4_min_sad == i4_sad_dc)
{
*u4_intra_mode = DC_CH_I8x8;
for (i = 0; i < 8; i++)
{
for (j = 0; j < 8; j++)
{
col = j / 4;
row = i / 4;
pu1_dst[2 * j] = u4_dc_val[row][col][0];
pu1_dst[2 * j + 1] = u4_dc_val[row][col][1];
}
pu1_dst += dst_strd;
}
}
else if (i4_min_sad == i4_sad_horz)
{
*u4_intra_mode = HORZ_CH_I8x8;
for (j = 0; j < 8; j++)
{
val_v = pu1_ngbr_pels[15 - 2 * j];
val_u = pu1_ngbr_pels[15 - 2 * j - 1];
for (i = 0; i < 8; i++)
{
pu1_dst[2 * i] = val_u;
pu1_dst[2 * i + 1] = val_v;
}
pu1_dst += dst_strd;
}
}
else
{
*u4_intra_mode = VERT_CH_I8x8;
pu1_neighbour = pu1_ngbr_pels + 18;
for (j = 0; j < 8; j++)
{
memcpy(pu1_dst, pu1_neighbour, MB_SIZE);
pu1_dst += dst_strd;
}
}
}
return;
}