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Cemu/dependencies/ih264d/decoder/ih264d_parse_cabac.c

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2022-08-22 22:21:23 +02:00
/******************************************************************************
*
* 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 ih264d_parse_cabac.c
*
* \brief
* This file contains cabac Residual decoding routines.
*
* \date
* 20/03/2003
*
* \author NS
***************************************************************************
*/
#include "ih264_typedefs.h"
#include "ih264_macros.h"
#include "ih264_platform_macros.h"
#include "ih264d_defs.h"
#include "ih264d_structs.h"
#include "ih264d_cabac.h"
#include "ih264d_bitstrm.h"
#include "ih264d_parse_mb_header.h"
#include "ih264d_debug.h"
#include "ih264d_tables.h"
#include "ih264d_error_handler.h"
#include "ih264d_parse_cabac.h"
#include "ih264d_parse_slice.h"
#include "ih264d_tables.h"
#include "ih264d_mb_utils.h"
#include "ih264d_utils.h"
/*!
********************************************************************************
* \if Function name : ih264d_read_coeff4x4_cabac \endif
*
* \brief This function encodes residual_block_cabac as defined in 7.3.5.3.2.
*
* \return
* Returns the index of last significant coeff.
*
********************************************************************************
*/
UWORD8 ih264d_read_coeff4x4_cabac(dec_bit_stream_t *ps_bitstrm,
UWORD32 u4_ctxcat,
bin_ctxt_model_t *ps_ctxt_sig_coeff,
dec_struct_t *ps_dec, /*!< pointer to access global variables*/
bin_ctxt_model_t *ps_ctxt_coded)
{
decoding_envirnoment_t *ps_cab_env = &ps_dec->s_cab_dec_env;
UWORD32 u4_coded_flag;
UWORD32 u4_offset, *pu4_buffer;
UWORD32 u4_code_int_range, u4_code_int_val_ofst;
tu_sblk4x4_coeff_data_t *ps_tu_4x4;
WORD16 *pi2_coeff_data;
WORD32 num_sig_coeffs = 0;
/*loading from strcuctures*/
ps_tu_4x4 = (tu_sblk4x4_coeff_data_t *)ps_dec->pv_parse_tu_coeff_data;
ps_tu_4x4->u2_sig_coeff_map = 0;
pi2_coeff_data = &ps_tu_4x4->ai2_level[0];
u4_offset = ps_bitstrm->u4_ofst;
pu4_buffer = ps_bitstrm->pu4_buffer;
u4_code_int_range = ps_cab_env->u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
{
/*inilined DecodeDecision_onebin begins*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (ps_ctxt_coded->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup =
pu4_table[(u1_mps_state << 2) + u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state, table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8)
{
RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst,
u4_offset, pu4_buffer)
}
ps_ctxt_coded->u1_mps_state = u1_mps_state;
u4_coded_flag = u4_symbol;
/*inilined DecodeDecision_onebin ends*/
}
}
if(u4_coded_flag)
{
{
bin_ctxt_model_t *p_binCtxt_last, *p_binCtxt_last_org;
UWORD32 uc_last_coeff_idx;
UWORD32 uc_bin;
UWORD32 i;
WORD32 first_coeff_offset = 0;
if((u4_ctxcat == CHROMA_AC_CTXCAT) || (u4_ctxcat == LUMA_AC_CTXCAT))
{
first_coeff_offset = 1;
}
i = 0;
if(u4_ctxcat == CHROMA_DC_CTXCAT)
{
uc_last_coeff_idx = 3;
}
else
{
UWORD32 u4_start;
u4_start = (u4_ctxcat & 1) + (u4_ctxcat >> 2);
uc_last_coeff_idx = 15 - u4_start;
}
p_binCtxt_last_org = ps_ctxt_sig_coeff
+ LAST_COEFF_CTXT_MINUS_SIG_COEFF_CTXT;
do
{
/*inilined DecodeDecision_onebin begins*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (ps_ctxt_sig_coeff->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst,
u4_symbol, u4_int_range_lps, u1_mps_state,
table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_14)
{
UWORD32 read_bits, u4_clz;
u4_clz = CLZ(u4_code_int_range);
NEXTBITS(read_bits, (u4_offset + 23), pu4_buffer,
u4_clz)
FLUSHBITS(u4_offset, (u4_clz))
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst << u4_clz)
| read_bits;
}
INC_BIN_COUNT(
ps_cab_env)
ps_ctxt_sig_coeff->u1_mps_state = u1_mps_state;
uc_bin = u4_symbol;
}
/*incrementing pointer to point to the context of the next bin*/
ps_ctxt_sig_coeff++;
/*inilined DecodeDecision_onebin ends*/
if(uc_bin)
{
num_sig_coeffs++;
SET_BIT(ps_tu_4x4->u2_sig_coeff_map, (i + first_coeff_offset));
p_binCtxt_last = p_binCtxt_last_org + i;
/*inilined DecodeDecision_onebin begins*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (p_binCtxt_last->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29)
& 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps
<< (23 - u4_clz);
u4_code_int_range = u4_code_int_range
- u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst,
u4_symbol, u4_int_range_lps,
u1_mps_state, table_lookup)
INC_BIN_COUNT(ps_cab_env)
p_binCtxt_last->u1_mps_state = u1_mps_state;
uc_bin = u4_symbol;
}
/*inilined DecodeDecision_onebin ends*/
if(uc_bin == 1)
goto label_read_levels;
}
i = i + 1;
}
while(i < uc_last_coeff_idx);
num_sig_coeffs++;
SET_BIT(ps_tu_4x4->u2_sig_coeff_map, (i + first_coeff_offset));
label_read_levels: ;
}
/// VALUE of No of Coeff in BLOCK = i + 1 for second case else i;
/* Decode coeff_abs_level_minus1 and coeff_sign_flag */
{
WORD32 i2_abs_lvl;
UWORD32 u1_abs_level_equal1 = 1, u1_abs_level_gt1 = 0;
UWORD32 u4_ctx_inc;
UWORD32 ui_prefix;
bin_ctxt_model_t *p_ctxt_abs_level;
p_ctxt_abs_level = ps_dec->p_coeff_abs_level_minus1_t[u4_ctxcat];
u4_ctx_inc = ((0x51));
/*****************************************************/
/* Main Loop runs for no. of Significant coefficient */
/*****************************************************/
do
{
{
INC_SYM_COUNT(&(ps_dec.s_cab_dec_env));
/*****************************************************/
/* inilining a modified ih264d_decode_bins_unary */
/*****************************************************/
{
UWORD32 u4_value;
UWORD32 u4_symbol;
bin_ctxt_model_t *ps_bin_ctxt;
UWORD32 u4_ctx_Inc;
u4_value = 0;
u4_ctx_Inc = u4_ctx_inc & 0xf;
ps_bin_ctxt = p_ctxt_abs_level + u4_ctx_Inc;
do
{
{
UWORD32 u4_qnt_int_range,
u4_int_range_lps;
UWORD32 u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range
<< u4_clz;
u4_qnt_int_range = (u4_qnt_int_range
>> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps
<< (23 - u4_clz);
u4_code_int_range = u4_code_int_range
- u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range,
u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state,
table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9)
{
RENORM_RANGE_OFFSET(u4_code_int_range,
u4_code_int_val_ofst,
u4_offset, pu4_buffer)
}
INC_BIN_COUNT(ps_cab_env);
ps_bin_ctxt->u1_mps_state = u1_mps_state;
}
INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env);
u4_value++;
ps_bin_ctxt = p_ctxt_abs_level + (u4_ctx_inc >> 4);
}
while(u4_symbol && (u4_value < UCOFF_LEVEL));
ui_prefix = u4_value - 1 + u4_symbol;
}
if(ui_prefix == UCOFF_LEVEL)
{
UWORD32 ui16_sufS = 0;
UWORD32 u1_max_bins;
UWORD32 u4_value;
i2_abs_lvl = UCOFF_LEVEL;
/*inlining ih264d_decode_bypass_bins_unary begins*/
{
UWORD32 uc_bin;
UWORD32 bits_to_flush;
bits_to_flush = 0;
/*renormalize to ensure there 23 bits more in the u4_code_int_val_ofst*/
{
UWORD32 u4_clz, read_bits;
u4_clz = CLZ(u4_code_int_range);
FLUSHBITS(u4_offset, u4_clz)
NEXTBITS(read_bits, u4_offset, pu4_buffer, CABAC_BITS_TO_READ)
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst
<< u4_clz) | read_bits;
}
do
{
bits_to_flush++;
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst >= u4_code_int_range)
{
/* S=1 */
uc_bin = 1;
u4_code_int_val_ofst -= u4_code_int_range;
}
else
{
/* S=0 */
uc_bin = 0;
}
INC_BIN_COUNT(
ps_cab_env);INC_BYPASS_BINS(ps_cab_env);
}
while(uc_bin && (bits_to_flush < CABAC_BITS_TO_READ));
u4_value = (bits_to_flush - 1);
}
/*inlining ih264d_decode_bypass_bins_unary ends*/
ui16_sufS = (1 << u4_value);
u1_max_bins = u4_value;
if(u4_value > 0)
{
/*inline bypassbins_flc begins*/
if(u4_value > 10)
{
UWORD32 u4_clz, read_bits;
u4_clz = CLZ(u4_code_int_range);
FLUSHBITS(u4_offset, u4_clz)
NEXTBITS(read_bits, u4_offset, pu4_buffer, CABAC_BITS_TO_READ)
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst
<< u4_clz) | read_bits;
}
{
UWORD32 ui_bins;
UWORD32 uc_bin;
UWORD32 bits_to_flush;
ui_bins = 0;
bits_to_flush = 0;
do
{
bits_to_flush++;
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst
>= u4_code_int_range)
{
/* S=1 */
uc_bin = 1;
u4_code_int_val_ofst -=
u4_code_int_range;
}
else
{
/* S=0 */
uc_bin = 0;
}
INC_BIN_COUNT(
ps_cab_env);INC_BYPASS_BINS(ps_cab_env);
ui_bins = ((ui_bins << 1) | uc_bin);
}
while(bits_to_flush < u1_max_bins);
u4_value = ui_bins;
}
/*inline bypassbins_flc ends*/
}
//Value of K
ui16_sufS += u4_value;
i2_abs_lvl += ui16_sufS;
}
else
i2_abs_lvl = 1 + ui_prefix;
if(i2_abs_lvl > 1)
{
u1_abs_level_gt1++;
}
if(!u1_abs_level_gt1)
{
u1_abs_level_equal1++;
u4_ctx_inc = (5 << 4) + MIN(u1_abs_level_equal1, 4);
}
else
u4_ctx_inc = (5 + MIN(u1_abs_level_gt1, 4)) << 4;
/*u4_ctx_inc = g_table_temp[u1_abs_level_gt1][u1_abs_level_equal1];*/
/* encode coeff_sign_flag[i] */
{
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst >= (u4_code_int_range))
{
/* S=1 */
u4_code_int_val_ofst -= u4_code_int_range;
i2_abs_lvl = (-i2_abs_lvl);
}
}
num_sig_coeffs--;
*pi2_coeff_data++ = i2_abs_lvl;
}
}
while(num_sig_coeffs > 0);
}
}
if(u4_coded_flag)
{
WORD32 offset;
offset = (UWORD8 *)pi2_coeff_data - (UWORD8 *)ps_tu_4x4;
offset = ALIGN4(offset);
ps_dec->pv_parse_tu_coeff_data = (void *)((UWORD8 *)ps_dec->pv_parse_tu_coeff_data + offset);
}
/*updating structures*/
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
ps_cab_env->u4_code_int_range = u4_code_int_range;
ps_bitstrm->u4_ofst = u4_offset;
return (u4_coded_flag);
}
/*!
********************************************************************************
* \if Function name : ih264d_read_coeff8x8_cabac \endif
*
* \brief This function encodes residual_block_cabac as defined in 7.3.5.3.2.
when transform_8x8_flag = 1
*
* \return
* Returns the index of last significant coeff.
*
********************************************************************************
*/
void ih264d_read_coeff8x8_cabac(dec_bit_stream_t *ps_bitstrm,
dec_struct_t *ps_dec, /*!< pointer to access global variables*/
dec_mb_info_t *ps_cur_mb_info)
{
decoding_envirnoment_t *ps_cab_env = &ps_dec->s_cab_dec_env;
UWORD32 u4_offset, *pu4_buffer;
UWORD32 u4_code_int_range, u4_code_int_val_ofst;
/* High profile related declarations */
UWORD8 u1_field_coding_flag = ps_cur_mb_info->ps_curmb->u1_mb_fld;
const UWORD8 *pu1_lastcoeff_context_inc =
(UWORD8 *)gau1_ih264d_lastcoeff_context_inc;
const UWORD8 *pu1_sigcoeff_context_inc;
bin_ctxt_model_t *ps_ctxt_sig_coeff;
WORD32 num_sig_coeffs = 0;
tu_blk8x8_coeff_data_t *ps_tu_8x8;
WORD16 *pi2_coeff_data;
/*loading from strcuctures*/
ps_tu_8x8 = (tu_blk8x8_coeff_data_t *)ps_dec->pv_parse_tu_coeff_data;
ps_tu_8x8->au4_sig_coeff_map[0] = 0;
ps_tu_8x8->au4_sig_coeff_map[1] = 0;
pi2_coeff_data = &ps_tu_8x8->ai2_level[0];
if(!u1_field_coding_flag)
{
pu1_sigcoeff_context_inc =
(UWORD8 *)gau1_ih264d_sigcoeff_context_inc_frame;
/*******************************************************************/
/* last coefficient context is derived from significant coeff u4_flag */
/* only significant coefficient matrix need to be initialized */
/*******************************************************************/
ps_ctxt_sig_coeff = ps_dec->s_high_profile.ps_sigcoeff_8x8_frame;
}
else
{
pu1_sigcoeff_context_inc =
(UWORD8 *)gau1_ih264d_sigcoeff_context_inc_field;
/*******************************************************************/
/* last coefficient context is derived from significant coeff u4_flag */
/* only significant coefficient matrix need to be initialized */
/*******************************************************************/
ps_ctxt_sig_coeff = ps_dec->s_high_profile.ps_sigcoeff_8x8_field;
}
/*loading from strcuctures*/
u4_offset = ps_bitstrm->u4_ofst;
pu4_buffer = ps_bitstrm->pu4_buffer;
u4_code_int_range = ps_cab_env->u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
{
{
bin_ctxt_model_t *p_binCtxt_last, *p_binCtxt_last_org,
*p_ctxt_sig_coeff_org;
UWORD32 uc_last_coeff_idx;
UWORD32 uc_bin;
UWORD32 i;
i = 0;
uc_last_coeff_idx = 63;
p_binCtxt_last_org = ps_ctxt_sig_coeff
+ LAST_COEFF_CTXT_MINUS_SIG_COEFF_CTXT_8X8;
p_ctxt_sig_coeff_org = ps_ctxt_sig_coeff;
do
{
/*inilined DecodeDecision_onebin begins*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (ps_ctxt_sig_coeff->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst,
u4_symbol, u4_int_range_lps, u1_mps_state,
table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_14)
{
UWORD32 read_bits, u4_clz;
u4_clz = CLZ(u4_code_int_range);
NEXTBITS(read_bits, (u4_offset + 23), pu4_buffer,
u4_clz)
FLUSHBITS(u4_offset, (u4_clz))
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst << u4_clz)
| read_bits;
}
ps_ctxt_sig_coeff->u1_mps_state = u1_mps_state;
uc_bin = u4_symbol;
}
/*incrementing pointer to point to the context of the next bin*/
ps_ctxt_sig_coeff = p_ctxt_sig_coeff_org
+ pu1_sigcoeff_context_inc[i + 1];
/*inilined DecodeDecision_onebin ends*/
if(uc_bin)
{
num_sig_coeffs++;
SET_BIT(ps_tu_8x8->au4_sig_coeff_map[i>31], (i > 31 ? i - 32:i));
p_binCtxt_last = p_binCtxt_last_org
+ pu1_lastcoeff_context_inc[i];
/*inilined DecodeDecision_onebin begins*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (p_binCtxt_last->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29)
& 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps
<< (23 - u4_clz);
u4_code_int_range = u4_code_int_range
- u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst,
u4_symbol, u4_int_range_lps,
u1_mps_state, table_lookup)
p_binCtxt_last->u1_mps_state = u1_mps_state;
uc_bin = u4_symbol;
}
/*inilined DecodeDecision_onebin ends*/
if(uc_bin == 1)
goto label_read_levels;
}
i = i + 1;
}
while(i < uc_last_coeff_idx);
num_sig_coeffs++;
SET_BIT(ps_tu_8x8->au4_sig_coeff_map[i>31], (i > 31 ? i - 32:i));
label_read_levels: ;
}
/// VALUE of No of Coeff in BLOCK = i + 1 for second case else i;
/* Decode coeff_abs_level_minus1 and coeff_sign_flag */
{
WORD32 i2_abs_lvl;
UWORD32 u1_abs_level_equal1 = 1, u1_abs_level_gt1 = 0;
UWORD32 u4_ctx_inc;
UWORD32 ui_prefix;
bin_ctxt_model_t *p_ctxt_abs_level;
p_ctxt_abs_level =
ps_dec->p_coeff_abs_level_minus1_t[LUMA_8X8_CTXCAT];
u4_ctx_inc = ((0x51));
/*****************************************************/
/* Main Loop runs for no. of Significant coefficient */
/*****************************************************/
do
{
{
/*****************************************************/
/* inilining a modified ih264d_decode_bins_unary */
/*****************************************************/
{
UWORD32 u4_value;
UWORD32 u4_symbol;
bin_ctxt_model_t *ps_bin_ctxt;
UWORD32 u4_ctx_Inc;
u4_value = 0;
u4_ctx_Inc = u4_ctx_inc & 0xf;
ps_bin_ctxt = p_ctxt_abs_level + u4_ctx_Inc;
do
{
{
UWORD32 u4_qnt_int_range,
u4_int_range_lps;
UWORD32 u1_mps_state;
UWORD32 table_lookup;
const UWORD32 *pu4_table =
(const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range
<< u4_clz;
u4_qnt_int_range = (u4_qnt_int_range
>> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps
<< (23 - u4_clz);
u4_code_int_range = u4_code_int_range
- u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range,
u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state,
table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9)
{
RENORM_RANGE_OFFSET(u4_code_int_range,
u4_code_int_val_ofst,
u4_offset, pu4_buffer)
}
ps_bin_ctxt->u1_mps_state = u1_mps_state;
}
u4_value++;
ps_bin_ctxt = p_ctxt_abs_level + (u4_ctx_inc >> 4);
}
while(u4_symbol && (u4_value < UCOFF_LEVEL));
ui_prefix = u4_value - 1 + u4_symbol;
}
if(ui_prefix == UCOFF_LEVEL)
{
UWORD32 ui16_sufS = 0;
UWORD32 u1_max_bins;
UWORD32 u4_value;
i2_abs_lvl = UCOFF_LEVEL;
/*inlining ih264d_decode_bypass_bins_unary begins*/
{
UWORD32 uc_bin;
UWORD32 bits_to_flush;
bits_to_flush = 0;
/*renormalize to ensure there 23 bits more in the u4_code_int_val_ofst*/
{
UWORD32 u4_clz, read_bits;
u4_clz = CLZ(u4_code_int_range);
FLUSHBITS(u4_offset, u4_clz)
NEXTBITS(read_bits, u4_offset, pu4_buffer, CABAC_BITS_TO_READ)
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst
<< u4_clz) | read_bits;
}
do
{
bits_to_flush++;
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst >= u4_code_int_range)
{
/* S=1 */
uc_bin = 1;
u4_code_int_val_ofst -= u4_code_int_range;
}
else
{
/* S=0 */
uc_bin = 0;
}
}
while(uc_bin && (bits_to_flush < CABAC_BITS_TO_READ));
u4_value = (bits_to_flush - 1);
}
/*inlining ih264d_decode_bypass_bins_unary ends*/
ui16_sufS = (1 << u4_value);
u1_max_bins = u4_value;
if(u4_value > 0)
{
/*inline bypassbins_flc begins*/
if(u4_value > 10)
{
UWORD32 u4_clz, read_bits;
u4_clz = CLZ(u4_code_int_range);
FLUSHBITS(u4_offset, u4_clz)
NEXTBITS(read_bits, u4_offset, pu4_buffer, CABAC_BITS_TO_READ)
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst
<< u4_clz) | read_bits;
}
{
UWORD32 ui_bins;
UWORD32 uc_bin;
UWORD32 bits_to_flush;
ui_bins = 0;
bits_to_flush = 0;
do
{
bits_to_flush++;
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst
>= u4_code_int_range)
{
/* S=1 */
uc_bin = 1;
u4_code_int_val_ofst -=
u4_code_int_range;
}
else
{
/* S=0 */
uc_bin = 0;
}
ui_bins = ((ui_bins << 1) | uc_bin);
}
while(bits_to_flush < u1_max_bins);
u4_value = ui_bins;
}
/*inline bypassbins_flc ends*/
}
//Value of K
ui16_sufS += u4_value;
i2_abs_lvl += (WORD32)ui16_sufS;
}
else
{
i2_abs_lvl = 1 + ui_prefix;
}
if(i2_abs_lvl > 1)
{
u1_abs_level_gt1++;
}
if(!u1_abs_level_gt1)
{
u1_abs_level_equal1++;
u4_ctx_inc = (5 << 4) + MIN(u1_abs_level_equal1, 4);
}
else
{
u4_ctx_inc = (5 + MIN(u1_abs_level_gt1, 4)) << 4;
}
/*u4_ctx_inc = g_table_temp[u1_abs_level_gt1][u1_abs_level_equal1];*/
/* encode coeff_sign_flag[i] */
{
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst >= (u4_code_int_range))
{
/* S=1 */
u4_code_int_val_ofst -= u4_code_int_range;
i2_abs_lvl = (-i2_abs_lvl);
}
}
*pi2_coeff_data++ = i2_abs_lvl;
num_sig_coeffs--;
}
}
while(num_sig_coeffs > 0);
}
}
{
WORD32 offset;
offset = (UWORD8 *)pi2_coeff_data - (UWORD8 *)ps_tu_8x8;
offset = ALIGN4(offset);
ps_dec->pv_parse_tu_coeff_data = (void *)((UWORD8 *)ps_dec->pv_parse_tu_coeff_data + offset);
}
/*updating structures*/
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
ps_cab_env->u4_code_int_range = u4_code_int_range;
ps_bitstrm->u4_ofst = u4_offset;
}
/*****************************************************************************/
/* */
/* Function Name : ih264d_cabac_parse_8x8block */
/* */
/* Description : This function does the residual parsing of 4 subblocks */
/* in a 8x8 block. */
/* */
/* Inputs : pi2_coeff_block : pointer to residual block where */
/* decoded and inverse scan coefficients are updated */
/* */
/* u4_sub_block_strd : indicates the number of sublocks */
/* in a row. It is 4 for luma and 2 for chroma. */
/* */
/* u4_ctx_cat : inidicates context category for residual */
/* decoding. */
/* */
/* ps_dec : pointer to Decstruct (decoder context) */
/* */
/* pu1_top_nnz : top nnz pointer */
/* */
/* pu1_left_nnz : left nnz pointer */
/* */
/* Globals : No */
/* Processing : Parsing for four subblocks in unrolled, top and left nnz */
/* are updated on the fly. csbp is set in accordance to */
/* decoded numcoeff for the subblock index in raster order */
/* */
/* Outputs : The updated residue buffer, nnzs and csbp current block */
/* */
/* Returns : Returns the coded sub block pattern csbp for the block */
/* */
/* Issues : <List any issues or problems with this function> */
/* */
/* Revision History: */
/* */
/* DD MM YYYY Author(s) Changes (Describe the changes made) */
/* 09 10 2008 Jay Draft */
/* */
/*****************************************************************************/
UWORD32 ih264d_cabac_parse_8x8block(WORD16 *pi2_coeff_block,
UWORD32 u4_sub_block_strd,
UWORD32 u4_ctx_cat,
dec_struct_t * ps_dec,
UWORD8 *pu1_top_nnz,
UWORD8 *pu1_left_nnz)
{
UWORD32 u4_ctxinc, u4_subblock_coded;
UWORD32 u4_top0, u4_top1;
UWORD32 u4_csbp = 0;
UWORD32 u4_idx = 0;
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
bin_ctxt_model_t * const ps_cbf = ps_dec->p_cbf_t[u4_ctx_cat];
bin_ctxt_model_t *ps_src_bin_ctxt;
bin_ctxt_model_t * const ps_sig_coeff_flag =
ps_dec->p_significant_coeff_flag_t[u4_ctx_cat];
UWORD8 *pu1_inv_scan = ps_dec->pu1_inv_scan;
/*------------------------------------------------------*/
/* Residual 4x4 decoding: SubBlock 0 */
/*------------------------------------------------------*/
u4_ctxinc = ((!!pu1_top_nnz[0]) << 1) + (!!pu1_left_nnz[0]);
ps_src_bin_ctxt = ps_cbf + u4_ctxinc;
u4_top0 = ih264d_read_coeff4x4_cabac( ps_bitstrm,
u4_ctx_cat, ps_sig_coeff_flag, ps_dec,
ps_src_bin_ctxt);
INSERT_BIT(u4_csbp, u4_idx, u4_top0);
/*------------------------------------------------------*/
/* Residual 4x4 decoding: SubBlock 1 */
/*------------------------------------------------------*/
u4_idx++;
pi2_coeff_block += NUM_COEFFS_IN_4x4BLK;
u4_ctxinc = ((!!pu1_top_nnz[1]) << 1) + u4_top0;
ps_src_bin_ctxt = ps_cbf + u4_ctxinc;
u4_top1 = ih264d_read_coeff4x4_cabac(ps_bitstrm,
u4_ctx_cat, ps_sig_coeff_flag, ps_dec,
ps_src_bin_ctxt);
INSERT_BIT(u4_csbp, u4_idx, u4_top1);
pu1_left_nnz[0] = u4_top1;
/*------------------------------------------------------*/
/* Residual 4x4 decoding: SubBlock 2 */
/*------------------------------------------------------*/
u4_idx += (u4_sub_block_strd - 1);
pi2_coeff_block += ((u4_sub_block_strd - 1) * NUM_COEFFS_IN_4x4BLK);
u4_ctxinc = (u4_top0 << 1) + (!!pu1_left_nnz[1]);
ps_src_bin_ctxt = ps_cbf + u4_ctxinc;
u4_subblock_coded = ih264d_read_coeff4x4_cabac(ps_bitstrm, u4_ctx_cat,
ps_sig_coeff_flag, ps_dec,
ps_src_bin_ctxt);
INSERT_BIT(u4_csbp, u4_idx, u4_subblock_coded);
pu1_top_nnz[0] = u4_subblock_coded;
/*------------------------------------------------------*/
/* Residual 4x4 decoding: SubBlock 3 */
/*------------------------------------------------------*/
u4_idx++;
pi2_coeff_block += NUM_COEFFS_IN_4x4BLK;
u4_ctxinc = (u4_top1 << 1) + u4_subblock_coded;
ps_src_bin_ctxt = ps_cbf + u4_ctxinc;
u4_subblock_coded = ih264d_read_coeff4x4_cabac(ps_bitstrm, u4_ctx_cat,
ps_sig_coeff_flag, ps_dec,
ps_src_bin_ctxt);
INSERT_BIT(u4_csbp, u4_idx, u4_subblock_coded);
pu1_top_nnz[1] = pu1_left_nnz[1] = u4_subblock_coded;
return (u4_csbp);
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_residual4x4_cabac \endif
*
* \brief
* This function parses CABAC syntax of a Luma and Chroma AC Residuals.
*
* \return
* 0 on Success and Error code otherwise
**************************************************************************
*/
WORD32 ih264d_parse_residual4x4_cabac(dec_struct_t * ps_dec,
dec_mb_info_t *ps_cur_mb_info,
UWORD8 u1_offset)
{
UWORD8 u1_cbp = ps_cur_mb_info->u1_cbp;
UWORD16 ui16_csbp = 0;
WORD16 *pi2_residual_buf;
UWORD8 uc_ctx_cat;
UWORD8 *pu1_top_nnz = ps_cur_mb_info->ps_curmb->pu1_nnz_y;
UWORD8 *pu1_left_nnz = ps_dec->pu1_left_nnz_y;
UWORD8 *pu1_top_nnz_uv = ps_cur_mb_info->ps_curmb->pu1_nnz_uv;
ctxt_inc_mb_info_t *p_curr_ctxt = ps_dec->ps_curr_ctxt_mb_info;
ctxt_inc_mb_info_t *ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
UWORD32 u4_nbr_avail = ps_dec->u1_mb_ngbr_availablity;
WORD16 *pi2_coeff_block = NULL;
bin_ctxt_model_t *ps_src_bin_ctxt;
UWORD8 u1_top_dc_csbp = (ps_top_ctxt->u1_yuv_dc_csbp) >> 1;
UWORD8 u1_left_dc_csbp = (ps_dec->pu1_left_yuv_dc_csbp[0]) >> 1;
if(!(u4_nbr_avail & TOP_MB_AVAILABLE_MASK))
{
if(p_curr_ctxt->u1_mb_type & CAB_INTRA_MASK)
{
*(UWORD32 *)pu1_top_nnz = 0;
u1_top_dc_csbp = 0;
*(UWORD32 *)pu1_top_nnz_uv = 0;
}
else
{
*(UWORD32 *)pu1_top_nnz = 0x01010101;
u1_top_dc_csbp = 0x3;
*(UWORD32 *)pu1_top_nnz_uv = 0x01010101;
}
}
else
{
UWORD32 *pu4_buf;
UWORD8 *pu1_buf;
pu1_buf = ps_cur_mb_info->ps_top_mb->pu1_nnz_y;
pu4_buf = (UWORD32 *)pu1_buf;
*(UWORD32 *)(pu1_top_nnz) = *pu4_buf;
pu1_buf = ps_cur_mb_info->ps_top_mb->pu1_nnz_uv;
pu4_buf = (UWORD32 *)pu1_buf;
*(UWORD32 *)(pu1_top_nnz_uv) = *pu4_buf;
}
if(!(u4_nbr_avail & LEFT_MB_AVAILABLE_MASK))
{
if(p_curr_ctxt->u1_mb_type & CAB_INTRA_MASK)
{
UWORD32 *pu4_buf;
UWORD8 *pu1_buf;
*(UWORD32 *)pu1_left_nnz = 0;
u1_left_dc_csbp = 0;
pu1_buf = ps_dec->pu1_left_nnz_uv;
pu4_buf = (UWORD32 *)pu1_buf;
*pu4_buf = 0;
}
else
{
UWORD32 *pu4_buf;
UWORD8 *pu1_buf;
*(UWORD32 *)pu1_left_nnz = 0x01010101;
u1_left_dc_csbp = 0x3;
pu1_buf = ps_dec->pu1_left_nnz_uv;
pu4_buf = (UWORD32 *)pu1_buf;
*pu4_buf = 0x01010101;
}
}
uc_ctx_cat = u1_offset ? LUMA_AC_CTXCAT : LUMA_4X4_CTXCAT;
ps_cur_mb_info->u1_qp_div6 = ps_dec->u1_qp_y_div6;
ps_cur_mb_info->u1_qpc_div6 = ps_dec->u1_qp_u_div6;
ps_cur_mb_info->u1_qp_rem6 = ps_dec->u1_qp_y_rem6;
ps_cur_mb_info->u1_qpc_rem6 = ps_dec->u1_qp_u_rem6;
// CHECK_THIS
ps_cur_mb_info->u1_qpcr_div6 = ps_dec->u1_qp_v_div6;
ps_cur_mb_info->u1_qpcr_rem6 = ps_dec->u1_qp_v_rem6;
if(u1_cbp & 0x0f)
{
if(ps_cur_mb_info->u1_tran_form8x8 == 0)
{
/*******************************************************************/
/* Block 0 residual decoding, check cbp and proceed (subblock = 0) */
/*******************************************************************/
if(!(u1_cbp & 0x1))
{
*(UWORD16 *)(pu1_top_nnz) = 0;
*(UWORD16 *)(pu1_left_nnz) = 0;
}
else
{
ui16_csbp = ih264d_cabac_parse_8x8block(pi2_coeff_block, 4,
uc_ctx_cat, ps_dec,
pu1_top_nnz,
pu1_left_nnz);
}
/*******************************************************************/
/* Block 1 residual decoding, check cbp and proceed (subblock = 2) */
/*******************************************************************/
pi2_coeff_block += (2 * NUM_COEFFS_IN_4x4BLK);
if(!(u1_cbp & 0x2))
{
*(UWORD16 *)(pu1_top_nnz + 2) = 0;
*(UWORD16 *)(pu1_left_nnz) = 0;
}
else
{
UWORD32 u4_temp = ih264d_cabac_parse_8x8block(pi2_coeff_block,
4, uc_ctx_cat,
ps_dec,
(pu1_top_nnz + 2),
pu1_left_nnz);
ui16_csbp |= (u4_temp << 2);
}
/*******************************************************************/
/* Block 2 residual decoding, check cbp and proceed (subblock = 8) */
/*******************************************************************/
pi2_coeff_block += (6 * NUM_COEFFS_IN_4x4BLK);
if(!(u1_cbp & 0x4))
{
*(UWORD16 *)(pu1_top_nnz) = 0;
*(UWORD16 *)(pu1_left_nnz + 2) = 0;
}
else
{
UWORD32 u4_temp = ih264d_cabac_parse_8x8block(
pi2_coeff_block, 4, uc_ctx_cat, ps_dec,
pu1_top_nnz, (pu1_left_nnz + 2));
ui16_csbp |= (u4_temp << 8);
}
/*******************************************************************/
/* Block 3 residual decoding, check cbp and proceed (subblock = 10)*/
/*******************************************************************/
pi2_coeff_block += (2 * NUM_COEFFS_IN_4x4BLK);
if(!(u1_cbp & 0x8))
{
*(UWORD16 *)(pu1_top_nnz + 2) = 0;
*(UWORD16 *)(pu1_left_nnz + 2) = 0;
}
else
{
UWORD32 u4_temp = ih264d_cabac_parse_8x8block(
pi2_coeff_block, 4, uc_ctx_cat, ps_dec,
(pu1_top_nnz + 2), (pu1_left_nnz + 2));
ui16_csbp |= (u4_temp << 10);
}
}
else
{
ui16_csbp = 0;
/*******************************************************************/
/* Block 0 residual decoding, check cbp and proceed (subblock = 0) */
/*******************************************************************/
if(!(u1_cbp & 0x1))
{
*(UWORD16 *)(pu1_top_nnz) = 0;
*(UWORD16 *)(pu1_left_nnz) = 0;
}
else
{
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
ih264d_read_coeff8x8_cabac( ps_bitstrm,
ps_dec, ps_cur_mb_info);
pu1_left_nnz[0] = 1;
pu1_left_nnz[1] = 1;
pu1_top_nnz[0] = 1;
pu1_top_nnz[1] = 1;
/* added to be used by BS computation module */
ui16_csbp |= 0x0033;
}
/*******************************************************************/
/* Block 1 residual decoding, check cbp and proceed (subblock = 2) */
/*******************************************************************/
pi2_coeff_block += 64;
if(!(u1_cbp & 0x2))
{
*(UWORD16 *)(pu1_top_nnz + 2) = 0;
*(UWORD16 *)(pu1_left_nnz) = 0;
}
else
{
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
ih264d_read_coeff8x8_cabac(ps_bitstrm,
ps_dec, ps_cur_mb_info);
pu1_left_nnz[0] = 1;
pu1_left_nnz[1] = 1;
pu1_top_nnz[2] = 1;
pu1_top_nnz[3] = 1;
/* added to be used by BS computation module */
ui16_csbp |= 0x00CC;
}
/*******************************************************************/
/* Block 2 residual decoding, check cbp and proceed (subblock = 8) */
/*******************************************************************/
pi2_coeff_block += 64;
if(!(u1_cbp & 0x4))
{
*(UWORD16 *)(pu1_top_nnz) = 0;
*(UWORD16 *)(pu1_left_nnz + 2) = 0;
}
else
{
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
ih264d_read_coeff8x8_cabac(ps_bitstrm,
ps_dec, ps_cur_mb_info);
pu1_left_nnz[2] = 1;
pu1_left_nnz[3] = 1;
pu1_top_nnz[0] = 1;
pu1_top_nnz[1] = 1;
/* added to be used by BS computation module */
ui16_csbp |= 0x3300;
}
/*******************************************************************/
/* Block 3 residual decoding, check cbp and proceed (subblock = 10)*/
/*******************************************************************/
pi2_coeff_block += 64;
if(!(u1_cbp & 0x8))
{
*(UWORD16 *)(pu1_top_nnz + 2) = 0;
*(UWORD16 *)(pu1_left_nnz + 2) = 0;
}
else
{
dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
ih264d_read_coeff8x8_cabac(ps_bitstrm,
ps_dec, ps_cur_mb_info);
pu1_left_nnz[2] = 1;
pu1_left_nnz[3] = 1;
pu1_top_nnz[2] = 1;
pu1_top_nnz[3] = 1;
/* added to be used by BS computation module */
ui16_csbp |= 0xCC00;
}
}
}
else
{
*(UWORD32 *)(pu1_top_nnz) = 0;
*(UWORD32 *)(pu1_left_nnz) = 0;
}
/*--------------------------------------------------------------------*/
/* Store the last row of N values to top row */
/*--------------------------------------------------------------------*/
ps_cur_mb_info->u2_luma_csbp = ui16_csbp;
ps_cur_mb_info->ps_curmb->u2_luma_csbp = ui16_csbp;
{
WORD8 i;
UWORD16 u2_chroma_csbp = 0;
ps_cur_mb_info->u2_chroma_csbp = 0;
u1_cbp >>= 4;
pu1_top_nnz = pu1_top_nnz_uv;
pu1_left_nnz = ps_dec->pu1_left_nnz_uv;
/*--------------------------------------------------------------------*/
/* if Chroma Component not present OR no ac values present */
/* Set the values of N to zero */
/*--------------------------------------------------------------------*/
if(u1_cbp == CBPC_ALLZERO)
{
ps_dec->pu1_left_yuv_dc_csbp[0] &= 0x1;
*(UWORD32 *)(pu1_top_nnz) = 0;
*(UWORD32 *)(pu1_left_nnz) = 0;
p_curr_ctxt->u1_yuv_dc_csbp &= 0x1;
return (0);
}
/*--------------------------------------------------------------------*/
/* Decode Chroma DC values */
/*--------------------------------------------------------------------*/
for(i = 0; i < 2; i++)
{
UWORD8 uc_a = 1, uc_b = 1;
UWORD32 u4_ctx_inc;
UWORD8 uc_codedBlockFlag;
UWORD8 pu1_inv_scan[4] =
{ 0, 1, 2, 3 };
WORD32 u4_scale;
WORD32 i4_mb_inter_inc;
tu_sblk4x4_coeff_data_t *ps_tu_4x4 =
(tu_sblk4x4_coeff_data_t *)ps_dec->pv_parse_tu_coeff_data;
WORD16 *pi2_coeff_data =
(WORD16 *)ps_dec->pv_parse_tu_coeff_data;
WORD16 ai2_dc_coef[4];
INC_SYM_COUNT(&(ps_dec->s_cab_dec_env));
u4_scale = (i) ?
(ps_dec->pu2_quant_scale_v[0]
<< ps_dec->u1_qp_v_div6) :
(ps_dec->pu2_quant_scale_u[0]
<< ps_dec->u1_qp_u_div6);
/*--------------------------------------------------------------------*/
/* Decode Bitstream to get the DC coeff */
/*--------------------------------------------------------------------*/
uc_a = (u1_left_dc_csbp >> i) & 0x01;
uc_b = (u1_top_dc_csbp >> i) & 0x01;
u4_ctx_inc = (uc_a + (uc_b << 1));
ps_src_bin_ctxt = (ps_dec->p_cbf_t[CHROMA_DC_CTXCAT]) + u4_ctx_inc;
uc_codedBlockFlag =
ih264d_read_coeff4x4_cabac(ps_bitstrm,
CHROMA_DC_CTXCAT,
ps_dec->p_significant_coeff_flag_t[CHROMA_DC_CTXCAT],
ps_dec, ps_src_bin_ctxt);
i4_mb_inter_inc = (!((ps_cur_mb_info->ps_curmb->u1_mb_type == I_4x4_MB)
|| (ps_cur_mb_info->ps_curmb->u1_mb_type == I_16x16_MB)))
* 3;
if(ps_dec->s_high_profile.u1_scaling_present)
{
u4_scale *=
ps_dec->s_high_profile.i2_scalinglist4x4[i4_mb_inter_inc
+ 1 + i][0];
}
else
{
u4_scale <<= 4;
}
if(uc_codedBlockFlag)
{
WORD32 i_z0, i_z1, i_z2, i_z3;
WORD32 *pi4_scale;
SET_BIT(u1_top_dc_csbp, i);
SET_BIT(u1_left_dc_csbp, i);
ai2_dc_coef[0] = 0;
ai2_dc_coef[1] = 0;
ai2_dc_coef[2] = 0;
ai2_dc_coef[3] = 0;
ih264d_unpack_coeff4x4_dc_4x4blk(ps_tu_4x4,
ai2_dc_coef,
pu1_inv_scan);
i_z0 = (ai2_dc_coef[0] + ai2_dc_coef[2]);
i_z1 = (ai2_dc_coef[0] - ai2_dc_coef[2]);
i_z2 = (ai2_dc_coef[1] - ai2_dc_coef[3]);
i_z3 = (ai2_dc_coef[1] + ai2_dc_coef[3]);
/*-----------------------------------------------------------*/
/* Scaling and storing the values back */
/*-----------------------------------------------------------*/
*pi2_coeff_data++ = ((i_z0 + i_z3) * u4_scale) >> 5;
*pi2_coeff_data++ = ((i_z0 - i_z3) * u4_scale) >> 5;
*pi2_coeff_data++ = ((i_z1 + i_z2) * u4_scale) >> 5;
*pi2_coeff_data++ = ((i_z1 - i_z2) * u4_scale) >> 5;
ps_dec->pv_parse_tu_coeff_data = (void *)pi2_coeff_data;
SET_BIT(ps_cur_mb_info->u1_yuv_dc_block_flag,(i+1));
}
else
{
CLEARBIT(u1_top_dc_csbp, i);
CLEARBIT(u1_left_dc_csbp, i);
}
}
/*********************************************************************/
/* Update the DC csbp */
/*********************************************************************/
ps_dec->pu1_left_yuv_dc_csbp[0] &= 0x1;
p_curr_ctxt->u1_yuv_dc_csbp &= 0x1;
ps_dec->pu1_left_yuv_dc_csbp[0] |= (u1_left_dc_csbp << 1);
p_curr_ctxt->u1_yuv_dc_csbp |= (u1_top_dc_csbp << 1);
if(u1_cbp == CBPC_ACZERO)
{
*(UWORD32 *)(pu1_top_nnz) = 0;
*(UWORD32 *)(pu1_left_nnz) = 0;
return (0);
}
/*--------------------------------------------------------------------*/
/* Decode Chroma AC values */
/*--------------------------------------------------------------------*/
{
UWORD32 u4_temp;
/*****************************************************************/
/* U Block residual decoding, check cbp and proceed (subblock=0)*/
/*****************************************************************/
u2_chroma_csbp = ih264d_cabac_parse_8x8block(pi2_coeff_block, 2,
CHROMA_AC_CTXCAT,
ps_dec, pu1_top_nnz,
pu1_left_nnz);
pi2_coeff_block += MB_CHROM_SIZE;
/*****************************************************************/
/* V Block residual decoding, check cbp and proceed (subblock=1)*/
/*****************************************************************/
u4_temp = ih264d_cabac_parse_8x8block(pi2_coeff_block, 2,
CHROMA_AC_CTXCAT,
ps_dec, (pu1_top_nnz + 2),
(pu1_left_nnz + 2));
u2_chroma_csbp |= (u4_temp << 4);
}
/*********************************************************************/
/* Update the AC csbp */
/*********************************************************************/
ps_cur_mb_info->u2_chroma_csbp = u2_chroma_csbp;
}
return (0);
}
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