/src/libavc/decoder/ih264d_parse_islice.c

Source
/******************************************************************************
 *
 * 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_islice.c
 *
 * \brief
 *    Contains routines that decode a I slice type
 *
 * Detailed_description
 *
 * \date
 *    07/07/2003
 *
 * \author  NS
 **************************************************************************
 */
#include <string.h>
#include "ih264_defs.h"
#include "ih264d_error_handler.h"
#include "ih264d_debug.h"
#include "ih264d_bitstrm.h"
#include "ih264d_defs.h"
#include "ih264d_debug.h"
#include "ih264d_tables.h"
#include "ih264d_structs.h"
#include "ih264d_defs.h"
#include "ih264d_parse_cavlc.h"
#include "ih264d_mb_utils.h"
#include "ih264d_deblocking.h"
#include "ih264d_cabac.h"
#include "ih264d_parse_cabac.h"
#include "ih264d_parse_mb_header.h"
#include "ih264d_parse_slice.h"
#include "ih264d_process_pslice.h"
#include "ih264d_process_intra_mb.h"
#include "ih264d_parse_islice.h"
#include "ih264d_error_handler.h"
#include "ih264d_mvpred.h"
#include "ih264d_defs.h"
#include "ih264d_thread_parse_decode.h"
#include "ithread.h"
#include "ih264d_parse_mb_header.h"
#include "assert.h"
#include "ih264d_utils.h"
#include "ih264d_format_conv.h"

void ih264d_init_cabac_contexts(UWORD8 u1_slice_type, dec_struct_t * ps_dec);

void ih264d_itrans_recon_luma_dc(dec_struct_t *ps_dec,
                                 WORD16* pi2_src,
                                 WORD16* pi2_coeff_block,
                                 const UWORD16 *pu2_weigh_mat);



/*!
 **************************************************************************
 * \if Function name : ParseIMb \endif
 *
 * \brief
 *    This function parses CAVLC syntax of a I MB. If 16x16 Luma DC transform
 *    is also done here. Transformed Luma DC values are copied in their
 *    0th pixel location of corrosponding CoeffBlock.
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_imb_cavlc(dec_struct_t * ps_dec,
                              dec_mb_info_t * ps_cur_mb_info,
                              UWORD32 u4_mb_num,
                              UWORD8 u1_mb_type)
{
    WORD32 i4_delta_qp;
    UWORD32 u4_temp;
    UWORD32 ui_is_top_mb_available;
    UWORD32 ui_is_left_mb_available;
    UWORD32 u4_cbp;
    UWORD32 u4_offset;
    UWORD32 *pu4_bitstrm_buf;
    WORD32 ret;

    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
    UNUSED(u4_mb_num);
    ps_cur_mb_info->u1_tran_form8x8 = 0;
    ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

    ps_cur_mb_info->u1_yuv_dc_block_flag = 0;

    u4_temp = ps_dec->u1_mb_ngbr_availablity;
    ui_is_top_mb_available = BOOLEAN(u4_temp & TOP_MB_AVAILABLE_MASK);
    ui_is_left_mb_available = BOOLEAN(u4_temp & LEFT_MB_AVAILABLE_MASK);

    pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;

    if(u1_mb_type == I_4x4_MB)
    {
        ps_cur_mb_info->ps_curmb->u1_mb_type = I_4x4_MB;
        u4_offset = 0;

        /*--------------------------------------------------------------------*/
        /* Read transform_size_8x8_flag if present                            */
        /*--------------------------------------------------------------------*/
        if(ps_dec->s_high_profile.u1_transform8x8_present)
        {
            ps_cur_mb_info->u1_tran_form8x8 = ih264d_get_bit_h264(ps_bitstrm);
            COPYTHECONTEXT("transform_size_8x8_flag", ps_cur_mb_info->u1_tran_form8x8);
            ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = ps_cur_mb_info->u1_tran_form8x8;
        }

        /*--------------------------------------------------------------------*/
        /* Read the IntraPrediction modes for LUMA                            */
        /*--------------------------------------------------------------------*/
        if (!ps_cur_mb_info->u1_tran_form8x8)
        {
            UWORD8 *pu1_temp;
            ih264d_read_intra_pred_modes(ps_dec,
                                          ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data),
                                          ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data+16),
                                          ps_cur_mb_info->u1_tran_form8x8);
            pu1_temp = (UWORD8 *)ps_dec->pv_parse_tu_coeff_data;
            pu1_temp += 32;
            ps_dec->pv_parse_tu_coeff_data = (void *)pu1_temp;
        }
        else
        {
            UWORD8 *pu1_temp;
            ih264d_read_intra_pred_modes(ps_dec,
                                          ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data),
                                          ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data+4),
                                          ps_cur_mb_info->u1_tran_form8x8);
            pu1_temp = (UWORD8 *)ps_dec->pv_parse_tu_coeff_data;
            pu1_temp += 8;
            ps_dec->pv_parse_tu_coeff_data = (void *)pu1_temp;
        }
        /*--------------------------------------------------------------------*/
        /* Read the IntraPrediction mode for CHROMA                           */
        /*--------------------------------------------------------------------*/
//Inlined ih264d_uev
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz, u4_temp;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);
            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);
            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
            {
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            }
            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_temp = ((1 << u4_ldz) + u4_word - 1);
            if(u4_temp > 3)
            {
                return ERROR_CHROMA_PRED_MODE;
            }
            ps_cur_mb_info->u1_chroma_pred_mode = u4_temp;
            COPYTHECONTEXT("intra_chroma_pred_mode", ps_cur_mb_info->u1_chroma_pred_mode);
        }
        /*--------------------------------------------------------------------*/
        /* Read the Coded block pattern                                       */
        /*--------------------------------------------------------------------*/
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);
            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);
            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
            {
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            }
            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_cbp = ((1 << u4_ldz) + u4_word - 1);
        }
        if(u4_cbp > 47)
        {
            return ERROR_CBP;
        }

        u4_cbp = gau1_ih264d_cbp_table[u4_cbp][0];
        COPYTHECONTEXT("coded_block_pattern", u1_cbp);
        ps_cur_mb_info->u1_cbp = u4_cbp;

        /*--------------------------------------------------------------------*/
        /* Read mb_qp_delta                                                   */
        /*--------------------------------------------------------------------*/
        if(ps_cur_mb_info->u1_cbp)
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz, u4_abs_val;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);

            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);

            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
            {
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            }

            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_abs_val = ((1 << u4_ldz) + u4_word) >> 1;

            if(u4_word & 0x1)
            {
                i4_delta_qp = (-(WORD32)u4_abs_val);
            }
            else
            {
                i4_delta_qp = (u4_abs_val);
            }

            if((i4_delta_qp < -26) || (i4_delta_qp > 25))
            {
                return ERROR_INV_RANGE_QP_T;
            }

            COPYTHECONTEXT("mb_qp_delta", i1_delta_qp);
            if(i4_delta_qp != 0)
            {
                ret = ih264d_update_qp(ps_dec, (WORD8)i4_delta_qp);
                if(ret != OK)
                    return ret;
            }
        }

    }
    else
    {
        u4_offset = 1;
        ps_cur_mb_info->ps_curmb->u1_mb_type = I_16x16_MB;
        /*-------------------------------------------------------------------*/
        /* Read the IntraPrediction mode for CHROMA                          */
        /*-------------------------------------------------------------------*/
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);
            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);
            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
            {
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            }
            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_temp = ((1 << u4_ldz) + u4_word - 1);

//Inlined ih264d_uev

            if(u4_temp > 3)
            {
                return ERROR_CHROMA_PRED_MODE;
            }
            ps_cur_mb_info->u1_chroma_pred_mode = u4_temp;
            COPYTHECONTEXT("intra_chroma_pred_mode", ps_cur_mb_info->u1_chroma_pred_mode);
        }
        /*-------------------------------------------------------------------*/
        /* Read the Coded block pattern                                      */
        /*-------------------------------------------------------------------*/
        u4_cbp = gau1_ih264d_cbp_tab[(u1_mb_type - 1) >> 2];
        ps_cur_mb_info->u1_cbp = u4_cbp;

        /*-------------------------------------------------------------------*/
        /* Read mb_qp_delta                                                  */
        /*-------------------------------------------------------------------*/
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz, u4_abs_val;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);

            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);

            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);

            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_abs_val = ((1 << u4_ldz) + u4_word) >> 1;

            if(u4_word & 0x1)
                i4_delta_qp = (-(WORD32)u4_abs_val);
            else
                i4_delta_qp = (u4_abs_val);

            if((i4_delta_qp < -26) || (i4_delta_qp > 25))
                return ERROR_INV_RANGE_QP_T;

        }
//inlinined ih264d_sev
        COPYTHECONTEXT("Delta quant", i1_delta_qp);

        if(i4_delta_qp != 0)
        {
            ret = ih264d_update_qp(ps_dec, (WORD8)i4_delta_qp);
            if(ret != OK)
                return ret;
        }

        {
            WORD16 i_scaleFactor;
            UWORD32 ui_N = 0;
            WORD16 *pi2_scale_matrix_ptr;
            /*******************************************************************/
            /* for luma DC coefficients the scaling is done during the parsing */
            /* to preserve the precision                                       */
            /*******************************************************************/
            if(ps_dec->s_high_profile.u1_scaling_present)
            {
                pi2_scale_matrix_ptr =
                                ps_dec->s_high_profile.i2_scalinglist4x4[0];
            }
            else
            {
                i_scaleFactor = 16;
                pi2_scale_matrix_ptr = &i_scaleFactor;
            }

            /*---------------------------------------------------------------*/
            /* Decode DC coefficients                                        */
            /*---------------------------------------------------------------*/
            /*---------------------------------------------------------------*/
            /* Calculation of N                                              */
            /*---------------------------------------------------------------*/
            if(ui_is_left_mb_available)
            {

                if(ui_is_top_mb_available)
                {
                    ui_N = ((ps_cur_mb_info->ps_top_mb->pu1_nnz_y[0]
                                    + ps_dec->pu1_left_nnz_y[0] + 1) >> 1);
                }
                else
                {
                    ui_N = ps_dec->pu1_left_nnz_y[0];
                }
            }
            else if(ui_is_top_mb_available)
            {
                ui_N = ps_cur_mb_info->ps_top_mb->pu1_nnz_y[0];
            }

            {
                WORD16 pi2_dc_coef[16];
                WORD32 pi4_tmp[16];
                tu_sblk4x4_coeff_data_t *ps_tu_4x4 =
                                (tu_sblk4x4_coeff_data_t *)ps_dec->pv_parse_tu_coeff_data;
                WORD16 *pi2_coeff_block =
                                (WORD16 *)ps_dec->pv_parse_tu_coeff_data;
                UWORD32 u4_num_coeff;
                ps_tu_4x4->u2_sig_coeff_map = 0;

                ret = ps_dec->pf_cavlc_parse4x4coeff[(ui_N > 7)](pi2_dc_coef, 0, ui_N,
                                                                 ps_dec, &u4_num_coeff);
                if(ret != OK)
                    return ret;

                if(EXCEED_OFFSET(ps_bitstrm))
                    return ERROR_EOB_TERMINATE_T;
                if(ps_tu_4x4->u2_sig_coeff_map)
                {
                    memset(pi2_dc_coef,0,sizeof(pi2_dc_coef));
                    ih264d_unpack_coeff4x4_dc_4x4blk(ps_tu_4x4,
                                                     pi2_dc_coef,
                                                     ps_dec->pu1_inv_scan);

                    PROFILE_DISABLE_IQ_IT_RECON()
                    ps_dec->pf_ihadamard_scaling_4x4(pi2_dc_coef,
                                                     pi2_coeff_block,
                                                     ps_dec->pu2_quant_scale_y,
                                                     (UWORD16 *)pi2_scale_matrix_ptr,
                                                     ps_dec->u1_qp_y_div6,
                                                     pi4_tmp);
                    pi2_coeff_block += 16;
                    ps_dec->pv_parse_tu_coeff_data = (void *)pi2_coeff_block;
                    SET_BIT(ps_cur_mb_info->u1_yuv_dc_block_flag,0);
                }

            }
        }
    }


    if(u4_cbp)
    {

        ret = ih264d_parse_residual4x4_cavlc(ps_dec, ps_cur_mb_info,
                                       (UWORD8)u4_offset);
        if(ret != OK)
            return ret;
        if(EXCEED_OFFSET(ps_bitstrm))
            return ERROR_EOB_TERMINATE_T;

        /* Store Left Mb NNZ and TOP chroma NNZ */
    }
    else
    {
        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_qpcr_div6 = ps_dec->u1_qp_v_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;
        ps_cur_mb_info->u1_qpcr_rem6 = ps_dec->u1_qp_v_rem6;
        ih264d_update_nnz_for_skipmb(ps_dec, ps_cur_mb_info, CAVLC);
    }

    return OK;
}

/*!
 **************************************************************************
 * \if Function name : ParseIMbCab \endif
 *
 * \brief
 *    This function parses CABAC syntax of a I MB. If 16x16 Luma DC transform
 *    is also done here. Transformed Luma DC values are copied in their
 *    0th pixel location of corrosponding CoeffBlock.
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_imb_cabac(dec_struct_t * ps_dec,
                              dec_mb_info_t * ps_cur_mb_info,
                              UWORD8 u1_mb_type)
{
    WORD8 i1_delta_qp;
    UWORD8 u1_cbp;
    UWORD8 u1_offset;
    /* Variables for handling Cabac contexts */
    ctxt_inc_mb_info_t *p_curr_ctxt = ps_dec->ps_curr_ctxt_mb_info;
    ctxt_inc_mb_info_t *ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    bin_ctxt_model_t *p_bin_ctxt;

    UWORD8 u1_intra_chrom_pred_mode;
    UWORD8 u1_dc_block_flag = 0;
    WORD32 ret;

    ps_cur_mb_info->u1_yuv_dc_block_flag = 0;

    if(ps_left_ctxt == ps_dec->ps_def_ctxt_mb_info)
    {
        ps_dec->pu1_left_yuv_dc_csbp[0] = 0xf;
    }

    if(ps_dec->ps_cur_slice->u1_slice_type != I_SLICE)
    {
        WORD32 *pi4_buf;
        WORD8 *pi1_buf;
        MEMSET_16BYTES(&ps_dec->pu1_left_mv_ctxt_inc[0][0], 0);
        *((UWORD32 *)ps_dec->pi1_left_ref_idx_ctxt_inc) = 0;
        MEMSET_16BYTES(p_curr_ctxt->u1_mv, 0);
        memset(p_curr_ctxt->i1_ref_idx, 0, 4);
    }

    if(u1_mb_type == I_4x4_MB)
    {
        ps_cur_mb_info->ps_curmb->u1_mb_type = I_4x4_MB;
        p_curr_ctxt->u1_mb_type = CAB_I4x4;
        u1_offset = 0;

        ps_cur_mb_info->u1_tran_form8x8 = 0;
        ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

        /*--------------------------------------------------------------------*/
        /* Read transform_size_8x8_flag if present                            */
        /*--------------------------------------------------------------------*/
        if(ps_dec->s_high_profile.u1_transform8x8_present)
        {
            ps_cur_mb_info->u1_tran_form8x8 = ih264d_parse_transform8x8flag_cabac(
                            ps_dec, ps_cur_mb_info);
            COPYTHECONTEXT("transform_size_8x8_flag", ps_cur_mb_info->u1_tran_form8x8);
            p_curr_ctxt->u1_transform8x8_ctxt = ps_cur_mb_info->u1_tran_form8x8;
            ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = ps_cur_mb_info->u1_tran_form8x8;
        }
        else
        {
            p_curr_ctxt->u1_transform8x8_ctxt = 0;
        }

        /*--------------------------------------------------------------------*/
        /* Read the IntraPrediction modes for LUMA                            */
        /*--------------------------------------------------------------------*/
        if (!ps_cur_mb_info->u1_tran_form8x8)
        {
            UWORD8 *pu1_temp;
            ih264d_read_intra_pred_modes_cabac(
                            ps_dec,
                            ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data),
                            ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data+16),
                            ps_cur_mb_info->u1_tran_form8x8);
            pu1_temp = (UWORD8 *)ps_dec->pv_parse_tu_coeff_data;
            pu1_temp += 32;
            ps_dec->pv_parse_tu_coeff_data = (void *)pu1_temp;
        }
        else
        {
            UWORD8 *pu1_temp;
            ih264d_read_intra_pred_modes_cabac(
                            ps_dec,
                            ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data),
                            ((UWORD8 *)ps_dec->pv_parse_tu_coeff_data+4),
                            ps_cur_mb_info->u1_tran_form8x8);
            pu1_temp = (UWORD8 *)ps_dec->pv_parse_tu_coeff_data;
            pu1_temp += 8;
            ps_dec->pv_parse_tu_coeff_data = (void *)pu1_temp;
        }
        /*--------------------------------------------------------------------*/
        /* Read the IntraPrediction mode for CHROMA                           */
        /*--------------------------------------------------------------------*/
        u1_intra_chrom_pred_mode = ih264d_parse_chroma_pred_mode_cabac(ps_dec);
        COPYTHECONTEXT("intra_chroma_pred_mode", u1_intra_chrom_pred_mode);
        p_curr_ctxt->u1_intra_chroma_pred_mode = ps_cur_mb_info->u1_chroma_pred_mode =
                        u1_intra_chrom_pred_mode;

        /*--------------------------------------------------------------------*/
        /* Read the Coded block pattern                                       */
        /*--------------------------------------------------------------------*/
        u1_cbp = ih264d_parse_ctx_cbp_cabac(ps_dec);
        COPYTHECONTEXT("coded_block_pattern", u1_cbp);
        ps_cur_mb_info->u1_cbp = u1_cbp;
        p_curr_ctxt->u1_cbp = u1_cbp;

        /*--------------------------------------------------------------------*/
        /* Read mb_qp_delta                                                   */
        /*--------------------------------------------------------------------*/
        if(ps_cur_mb_info->u1_cbp)
        {
            ret = ih264d_parse_mb_qp_delta_cabac(ps_dec, &i1_delta_qp);
            if(ret != OK)
                return ret;
            COPYTHECONTEXT("mb_qp_delta", i1_delta_qp);
            if(i1_delta_qp != 0)
            {
                ret = ih264d_update_qp(ps_dec, i1_delta_qp);
                if(ret != OK)
                    return ret;
            }
        }
        else
            ps_dec->i1_prev_mb_qp_delta = 0;
        p_curr_ctxt->u1_yuv_dc_csbp &= 0xFE;
    }
    else
    {
        u1_offset = 1;
        ps_cur_mb_info->ps_curmb->u1_mb_type = I_16x16_MB;
        p_curr_ctxt->u1_mb_type = CAB_I16x16;
        ps_cur_mb_info->u1_tran_form8x8 = 0;
        p_curr_ctxt->u1_transform8x8_ctxt = 0;
        ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;
        /*--------------------------------------------------------------------*/
        /* Read the IntraPrediction mode for CHROMA                           */
        /*--------------------------------------------------------------------*/
        u1_intra_chrom_pred_mode = ih264d_parse_chroma_pred_mode_cabac(ps_dec);
        if(u1_intra_chrom_pred_mode > 3)
            return ERROR_CHROMA_PRED_MODE;

        COPYTHECONTEXT("Chroma intra_chroma_pred_mode pred mode", u1_intra_chrom_pred_mode);
        p_curr_ctxt->u1_intra_chroma_pred_mode = ps_cur_mb_info->u1_chroma_pred_mode =
                        u1_intra_chrom_pred_mode;

        /*--------------------------------------------------------------------*/
        /* Read the Coded block pattern                                       */
        /*--------------------------------------------------------------------*/
        u1_cbp = gau1_ih264d_cbp_tab[(u1_mb_type - 1) >> 2];
        ps_cur_mb_info->u1_cbp = u1_cbp;
        p_curr_ctxt->u1_cbp = u1_cbp;

        /*--------------------------------------------------------------------*/
        /* Read mb_qp_delta                                                   */
        /*--------------------------------------------------------------------*/
        ret = ih264d_parse_mb_qp_delta_cabac(ps_dec, &i1_delta_qp);
        if(ret != OK)
            return ret;
        COPYTHECONTEXT("mb_qp_delta", i1_delta_qp);
        if(i1_delta_qp != 0)
        {
            ret = ih264d_update_qp(ps_dec, i1_delta_qp);
            if(ret != OK)
                return ret;
        }

        {
            WORD16 i_scaleFactor;
            WORD16* pi2_scale_matrix_ptr;
            /*******************************************************************/
            /* for luma DC coefficients the scaling is done during the parsing */
            /* to preserve the precision                                       */
            /*******************************************************************/
            if(ps_dec->s_high_profile.u1_scaling_present)
            {
                pi2_scale_matrix_ptr =
                                ps_dec->s_high_profile.i2_scalinglist4x4[0];

            }
            else
            {
                i_scaleFactor = 16;
                pi2_scale_matrix_ptr = &i_scaleFactor;
            }
            {
                ctxt_inc_mb_info_t *ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
                UWORD8 uc_a, uc_b;
                UWORD32 u4_ctx_inc;

                INC_SYM_COUNT(&(ps_dec->s_cab_dec_env));

                /* if MbAddrN not available then CondTermN = 1 */
                uc_b = ((ps_top_ctxt->u1_yuv_dc_csbp) & 0x01);

                /* if MbAddrN not available then CondTermN = 1 */
                uc_a = ((ps_dec->pu1_left_yuv_dc_csbp[0]) & 0x01);

                u4_ctx_inc = (uc_a + (uc_b << 1));

                {
                    WORD16 pi2_dc_coef[16];
                    tu_sblk4x4_coeff_data_t *ps_tu_4x4 =
                                    (tu_sblk4x4_coeff_data_t *)ps_dec->pv_parse_tu_coeff_data;
                    WORD16 *pi2_coeff_block =
                                    (WORD16 *)ps_dec->pv_parse_tu_coeff_data;

                    p_bin_ctxt = (ps_dec->p_cbf_t[LUMA_DC_CTXCAT]) + u4_ctx_inc;

                    u1_dc_block_flag =
                                    ih264d_read_coeff4x4_cabac(ps_bitstrm,
                                                    LUMA_DC_CTXCAT,
                                                    ps_dec->p_significant_coeff_flag_t[LUMA_DC_CTXCAT],
                                                    ps_dec, p_bin_ctxt);

                    /* Store coded_block_flag */
                    p_curr_ctxt->u1_yuv_dc_csbp &= 0xFE;
                    p_curr_ctxt->u1_yuv_dc_csbp |= u1_dc_block_flag;
                    if(u1_dc_block_flag)
                    {
                        WORD32 pi4_tmp[16];
                        memset(pi2_dc_coef,0,sizeof(pi2_dc_coef));
                        ih264d_unpack_coeff4x4_dc_4x4blk(ps_tu_4x4,
                                                         pi2_dc_coef,
                                                         ps_dec->pu1_inv_scan);

                        PROFILE_DISABLE_IQ_IT_RECON()
                        ps_dec->pf_ihadamard_scaling_4x4(pi2_dc_coef,
                                                         pi2_coeff_block,
                                                         ps_dec->pu2_quant_scale_y,
                                                         (UWORD16 *)pi2_scale_matrix_ptr,
                                                         ps_dec->u1_qp_y_div6,
                                                         pi4_tmp);
                        pi2_coeff_block += 16;
                        ps_dec->pv_parse_tu_coeff_data = (void *)pi2_coeff_block;
                        SET_BIT(ps_cur_mb_info->u1_yuv_dc_block_flag,0);
                    }

                }

            }
        }
    }

    ps_dec->pu1_left_yuv_dc_csbp[0] &= 0x6;
    ps_dec->pu1_left_yuv_dc_csbp[0] |= u1_dc_block_flag;

    ih264d_parse_residual4x4_cabac(ps_dec, ps_cur_mb_info, u1_offset);
    if(EXCEED_OFFSET(ps_bitstrm))
        return ERROR_EOB_TERMINATE_T;
    return OK;
}

/*****************************************************************************/
/*                                                                           */
/*  Function Name : ih264d_parse_islice_data_cavlc                                  */
/*                                                                           */
/*  Description   : This function parses cabac syntax of a inter slice on    */
/*                  N MB basis.                                              */
/*                                                                           */
/*  Inputs        : ps_dec                                                   */
/*                  sliceparams                                              */
/*                  firstMbInSlice                                           */
/*                                                                           */
/*  Processing    : 1. After parsing syntax for N MBs those N MBs are        */
/*                     decoded till the end of slice.                        */
/*                                                                           */
/*  Returns       : 0                                                        */
/*                                                                           */
/*  Issues        : <List any issues or problems with this function>         */
/*                                                                           */
/*  Revision History:                                                        */
/*                                                                           */
/*         DD MM YYYY   Author(s)       Changes (Describe the changes made)  */
/*         24 06 2005   ARNY            Draft                                */
/*                                                                           */
/*****************************************************************************/
WORD32 ih264d_parse_islice_data_cavlc(dec_struct_t * ps_dec,
                                      dec_slice_params_t * ps_slice,
                                      UWORD16 u2_first_mb_in_slice)
{
    UWORD8 uc_more_data_flag;
    UWORD32 u4_num_mbs, u4_mb_idx;
    dec_mb_info_t *ps_cur_mb_info;
    deblk_mb_t *ps_cur_deblk_mb;
    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
    UWORD16 i2_pic_wdin_mbs = ps_dec->u2_frm_wd_in_mbs;
    WORD32 i4_cur_mb_addr;
    UWORD8 u1_mbaff;
    UWORD32 u4_num_mbs_next, u4_end_of_row, u4_tfr_n_mb;
    WORD32 ret = OK;

    ps_dec->u1_qp = ps_slice->u1_slice_qp;
    ih264d_update_qp(ps_dec, 0);
    u1_mbaff = ps_slice->u1_mbaff_frame_flag;

    /* initializations */
    u4_mb_idx = ps_dec->u4_mb_idx;
    u4_num_mbs = u4_mb_idx;

    uc_more_data_flag = 1;
    i4_cur_mb_addr = u2_first_mb_in_slice << u1_mbaff;

    do
    {
        UWORD8 u1_mb_type;

        ps_dec->pv_prev_mb_parse_tu_coeff_data = ps_dec->pv_parse_tu_coeff_data;

        if(i4_cur_mb_addr > ps_dec->ps_cur_sps->u4_max_mb_addr)
        {
            break;
        }

        ps_cur_mb_info = ps_dec->ps_nmb_info + u4_num_mbs;
        ps_dec->u4_num_mbs_cur_nmb = u4_num_mbs;
        ps_dec->u4_num_pmbair = (u4_num_mbs >> u1_mbaff);

        ps_cur_mb_info->u1_end_of_slice = 0;

        /***************************************************************/
        /* Get the required information for decoding of MB             */
        /* mb_x, mb_y , neighbour availablity,                         */
        /***************************************************************/
        ps_dec->pf_get_mb_info(ps_dec, i4_cur_mb_addr, ps_cur_mb_info, 0);

        /***************************************************************/
        /* Set the deblocking parameters for this MB                   */
        /***************************************************************/
        ps_cur_deblk_mb = ps_dec->ps_deblk_mbn + u4_num_mbs;

        if(ps_dec->u4_app_disable_deblk_frm == 0)
            ih264d_set_deblocking_parameters(ps_cur_deblk_mb, ps_slice,
                                             ps_dec->u1_mb_ngbr_availablity,
                                             ps_dec->u1_cur_mb_fld_dec_flag);

        ps_cur_deblk_mb->u1_mb_type = ps_cur_deblk_mb->u1_mb_type | D_INTRA_MB;

        /**************************************************************/
        /* Macroblock Layer Begins, Decode the u1_mb_type                */
        /**************************************************************/
//Inlined ih264d_uev
        {
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz, u4_temp;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);
            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);
            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            *pu4_bitstrm_ofst = u4_bitstream_offset;
            u4_temp = ((1 << u4_ldz) + u4_word - 1);
            if(u4_temp > 25)
                return ERROR_MB_TYPE;
            u1_mb_type = u4_temp;

        }
//Inlined ih264d_uev
        ps_cur_mb_info->u1_mb_type = u1_mb_type;
        COPYTHECONTEXT("u1_mb_type", u1_mb_type);

        /**************************************************************/
        /* Parse Macroblock data                                      */
        /**************************************************************/
        if(25 == u1_mb_type)
        {
            /* I_PCM_MB */
            ps_cur_mb_info->ps_curmb->u1_mb_type = I_PCM_MB;
            ret = ih264d_parse_ipcm_mb(ps_dec, ps_cur_mb_info, u4_num_mbs);
            if(ret != OK)
                return ret;
            ps_cur_deblk_mb->u1_mb_qp = 0;
        }
        else
        {
            ret = ih264d_parse_imb_cavlc(ps_dec, ps_cur_mb_info, u4_num_mbs, u1_mb_type);
            if(ret != OK)
                return ret;
            ps_cur_deblk_mb->u1_mb_qp = ps_dec->u1_qp;
        }

        if(ps_dec->u1_enable_mb_info)
        {
            ih264d_populate_mb_info_map(ps_dec, ps_cur_mb_info, ps_cur_mb_info->u2_mbx << 1,
                                        ps_cur_mb_info->u2_mby << 1, ps_cur_deblk_mb->u1_mb_qp);
        }

        uc_more_data_flag = MORE_RBSP_DATA(ps_bitstrm);

        if(u1_mbaff)
        {
            ih264d_update_mbaff_left_nnz(ps_dec, ps_cur_mb_info);
            if(!uc_more_data_flag && (0 == (i4_cur_mb_addr & 1)))
            {
                return ERROR_EOB_FLUSHBITS_T;
            }
        }
        /**************************************************************/
        /* Get next Macroblock address                                */
        /**************************************************************/

        i4_cur_mb_addr++;


        /* Store the colocated information */
        {
            mv_pred_t *ps_mv_nmb_start = ps_dec->ps_mv_cur + (u4_num_mbs << 4);

            mv_pred_t s_mvPred =
                {
                    { 0, 0, 0, 0 },
                      { -1, -1 }, 0, 0};
            ih264d_rep_mv_colz(ps_dec, &s_mvPred, ps_mv_nmb_start, 0,
                               (UWORD8)(ps_dec->u1_cur_mb_fld_dec_flag << 1), 4,
                               4);
        }

        /*if num _cores is set to 3,compute bs will be done in another thread*/
        if(ps_dec->u4_num_cores < 3)
        {
            if(ps_dec->u4_app_disable_deblk_frm == 0)
                ps_dec->pf_compute_bs(ps_dec, ps_cur_mb_info,
                                     (UWORD16)(u4_num_mbs >> u1_mbaff));
        }
        u4_num_mbs++;

        /****************************************************************/
        /* Check for End Of Row                                         */
        /****************************************************************/
        u4_num_mbs_next = i2_pic_wdin_mbs - ps_dec->u2_mbx - 1;
        u4_end_of_row = (!u4_num_mbs_next) && (!(u1_mbaff && (u4_num_mbs & 0x01)));
        u4_tfr_n_mb = (u4_num_mbs == ps_dec->u4_recon_mb_grp) || u4_end_of_row
                        || (!uc_more_data_flag);
        ps_cur_mb_info->u1_end_of_slice = (!uc_more_data_flag);

        /*H264_DEC_DEBUG_PRINT("Pic: %d Mb_X=%d Mb_Y=%d",
         ps_slice->i4_poc >> ps_slice->u1_field_pic_flag,
         ps_dec->u2_mbx,ps_dec->u2_mby + (1 - ps_cur_mb_info->u1_topmb));
         H264_DEC_DEBUG_PRINT("u4_tfr_n_mb || (!uc_more_data_flag): %d", u4_tfr_n_mb || (!uc_more_data_flag));*/
        if(u4_tfr_n_mb || (!uc_more_data_flag))
        {

            if(ps_dec->u1_separate_parse)
            {
                ih264d_parse_tfr_nmb(ps_dec, u4_mb_idx, u4_num_mbs,
                                     u4_num_mbs_next, u4_tfr_n_mb, u4_end_of_row);
                ps_dec->ps_nmb_info +=  u4_num_mbs;
            }
            else
            {
                ih264d_decode_recon_tfr_nmb(ps_dec, u4_mb_idx, u4_num_mbs,
                                            u4_num_mbs_next, u4_tfr_n_mb,
                                            u4_end_of_row);
            }
            ps_dec->u4_total_mbs_coded += u4_num_mbs;
            if(u4_tfr_n_mb)
                u4_num_mbs = 0;
            u4_mb_idx = u4_num_mbs;
            ps_dec->u4_mb_idx = u4_num_mbs;

        }
    }
    while(uc_more_data_flag);

    ps_dec->u4_num_mbs_cur_nmb = 0;
    ps_dec->ps_cur_slice->u4_mbs_in_slice = i4_cur_mb_addr

                        - (u2_first_mb_in_slice << u1_mbaff);

    return ret;
}

/*****************************************************************************/
/*                                                                           */
/*  Function Name : ih264d_parse_islice_data_cabac                                  */
/*                                                                           */
/*  Description   : This function parses cabac syntax of a inter slice on    */
/*                  N MB basis.                                              */
/*                                                                           */
/*  Inputs        : ps_dec                                                   */
/*                  sliceparams                                              */
/*                  firstMbInSlice                                           */
/*                                                                           */
/*  Processing    : 1. After parsing syntax for N MBs those N MBs are        */
/*                     decoded till the end of slice.                        */
/*                                                                           */
/*  Returns       : 0                                                        */
/*                                                                           */
/*  Issues        : <List any issues or problems with this function>         */
/*                                                                           */
/*  Revision History:                                                        */
/*                                                                           */
/*         DD MM YYYY   Author(s)       Changes (Describe the changes made)  */
/*         24 06 2005   ARNY            Draft                                */
/*                                                                           */
/*****************************************************************************/
WORD32 ih264d_parse_islice_data_cabac(dec_struct_t * ps_dec,
                                      dec_slice_params_t * ps_slice,
                                      UWORD16 u2_first_mb_in_slice)
{
    UWORD8 uc_more_data_flag;
    UWORD32 u4_num_mbs, u4_mb_idx;
    dec_mb_info_t *ps_cur_mb_info;
    deblk_mb_t *ps_cur_deblk_mb;

    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD16 i2_pic_wdin_mbs = ps_dec->u2_frm_wd_in_mbs;
    WORD32 i4_cur_mb_addr;
    UWORD8 u1_mbaff;
    UWORD32 u4_num_mbs_next, u4_end_of_row, u4_tfr_n_mb;
    WORD32 ret = OK;

    ps_dec->u1_qp = ps_slice->u1_slice_qp;
    ih264d_update_qp(ps_dec, 0);
    u1_mbaff = ps_slice->u1_mbaff_frame_flag;

    if(ps_bitstrm->u4_ofst & 0x07)
    {
        ps_bitstrm->u4_ofst += 8;
        ps_bitstrm->u4_ofst &= 0xFFFFFFF8;
    }
    ret = ih264d_init_cabac_dec_envirnoment(&(ps_dec->s_cab_dec_env), ps_bitstrm);
    if(ret != OK)
        return ret;
    ih264d_init_cabac_contexts(I_SLICE, ps_dec);

    ps_dec->i1_prev_mb_qp_delta = 0;

    /* initializations */
    u4_mb_idx = ps_dec->u4_mb_idx;
    u4_num_mbs = u4_mb_idx;

    uc_more_data_flag = 1;
    i4_cur_mb_addr = u2_first_mb_in_slice << u1_mbaff;
    do
    {
        UWORD16 u2_mbx;

        ps_dec->pv_prev_mb_parse_tu_coeff_data = ps_dec->pv_parse_tu_coeff_data;

        if(i4_cur_mb_addr > ps_dec->ps_cur_sps->u4_max_mb_addr)
        {
            break;
        }

        {
            UWORD8 u1_mb_type;

            ps_cur_mb_info = ps_dec->ps_nmb_info + u4_num_mbs;
            ps_dec->u4_num_mbs_cur_nmb = u4_num_mbs;
            ps_dec->u4_num_pmbair = (u4_num_mbs >> u1_mbaff);

            ps_cur_mb_info->u1_end_of_slice = 0;

            /***************************************************************/
            /* Get the required information for decoding of MB                  */
            /* mb_x, mb_y , neighbour availablity,                              */
            /***************************************************************/
            ps_dec->pf_get_mb_info(ps_dec, i4_cur_mb_addr, ps_cur_mb_info, 0);
            u2_mbx = ps_dec->u2_mbx;

            /*********************************************************************/
            /* initialize u1_tran_form8x8 to zero to aviod uninitialized accesses */
            /*********************************************************************/
            ps_cur_mb_info->u1_tran_form8x8 = 0;
            ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

            /***************************************************************/
            /* Set the deblocking parameters for this MB                   */
            /***************************************************************/
            ps_cur_deblk_mb = ps_dec->ps_deblk_mbn + u4_num_mbs;
            if(ps_dec->u4_app_disable_deblk_frm == 0)
                ih264d_set_deblocking_parameters(
                                ps_cur_deblk_mb, ps_slice,
                                ps_dec->u1_mb_ngbr_availablity,
                                ps_dec->u1_cur_mb_fld_dec_flag);

            ps_cur_deblk_mb->u1_mb_type = ps_cur_deblk_mb->u1_mb_type
                            | D_INTRA_MB;

            /* Macroblock Layer Begins */
            /* Decode the u1_mb_type */
            u1_mb_type = ih264d_parse_mb_type_intra_cabac(0, ps_dec);
            if(u1_mb_type > 25)
                return ERROR_MB_TYPE;
            ps_cur_mb_info->u1_mb_type = u1_mb_type;
            COPYTHECONTEXT("u1_mb_type", u1_mb_type);

            /* Parse Macroblock Data */
            if(25 == u1_mb_type)
            {
                /* I_PCM_MB */
                ps_cur_mb_info->ps_curmb->u1_mb_type = I_PCM_MB;
                ret = ih264d_parse_ipcm_mb(ps_dec, ps_cur_mb_info, u4_num_mbs);
                if(ret != OK)
                    return ret;
                ps_cur_deblk_mb->u1_mb_qp = 0;
            }
            else
            {
                ret = ih264d_parse_imb_cabac(ps_dec, ps_cur_mb_info, u1_mb_type);
                if(ret != OK)
                    return ret;
                ps_cur_deblk_mb->u1_mb_qp = ps_dec->u1_qp;
            }

            if(ps_dec->u1_enable_mb_info)
            {
                ih264d_populate_mb_info_map(ps_dec, ps_cur_mb_info, ps_cur_mb_info->u2_mbx << 1,
                                            ps_cur_mb_info->u2_mby << 1, ps_cur_deblk_mb->u1_mb_qp);
            }

            if(u1_mbaff)
            {
                ih264d_update_mbaff_left_nnz(ps_dec, ps_cur_mb_info);
            }


            if(ps_cur_mb_info->u1_topmb && u1_mbaff)
                uc_more_data_flag = 1;
            else
            {
                uc_more_data_flag = ih264d_decode_terminate(&ps_dec->s_cab_dec_env,
                                                          ps_bitstrm);
                uc_more_data_flag = !uc_more_data_flag;
                COPYTHECONTEXT("Decode Sliceterm",!uc_more_data_flag);
            }

            if(u1_mbaff)
            {
                if(!uc_more_data_flag && (0 == (i4_cur_mb_addr & 1)))
                {
                    return ERROR_EOB_FLUSHBITS_T;
                }
            }
            /* Next macroblock information */
            i4_cur_mb_addr++;
            /* Store the colocated information */
            {

                mv_pred_t *ps_mv_nmb_start = ps_dec->ps_mv_cur + (u4_num_mbs << 4);
                mv_pred_t s_mvPred =
                    {
                        { 0, 0, 0, 0 },
                          { -1, -1 }, 0, 0};
                ih264d_rep_mv_colz(
                                ps_dec, &s_mvPred, ps_mv_nmb_start, 0,
                                (UWORD8)(ps_dec->u1_cur_mb_fld_dec_flag << 1),
                                4, 4);
            }
            /*if num _cores is set to 3,compute bs will be done in another thread*/
            if(ps_dec->u4_num_cores < 3)
            {
                if(ps_dec->u4_app_disable_deblk_frm == 0)
                    ps_dec->pf_compute_bs(ps_dec, ps_cur_mb_info,
                                         (UWORD16)(u4_num_mbs >> u1_mbaff));
            }
            u4_num_mbs++;

        }

        /****************************************************************/
        /* Check for End Of Row                                         */
        /****************************************************************/
        u4_num_mbs_next = i2_pic_wdin_mbs - u2_mbx - 1;
        u4_end_of_row = (!u4_num_mbs_next) && (!(u1_mbaff && (u4_num_mbs & 0x01)));
        u4_tfr_n_mb = (u4_num_mbs == ps_dec->u4_recon_mb_grp) || u4_end_of_row
                        || (!uc_more_data_flag);
        ps_cur_mb_info->u1_end_of_slice = (!uc_more_data_flag);

        if(u4_tfr_n_mb || (!uc_more_data_flag))
        {


            if(ps_dec->u1_separate_parse)
            {
                ih264d_parse_tfr_nmb(ps_dec, u4_mb_idx, u4_num_mbs,
                                     u4_num_mbs_next, u4_tfr_n_mb, u4_end_of_row);
                ps_dec->ps_nmb_info +=  u4_num_mbs;
            }
            else
            {
                ih264d_decode_recon_tfr_nmb(ps_dec, u4_mb_idx, u4_num_mbs,
                                            u4_num_mbs_next, u4_tfr_n_mb,
                                            u4_end_of_row);
            }
            ps_dec->u4_total_mbs_coded += u4_num_mbs;
            if(u4_tfr_n_mb)
                u4_num_mbs = 0;
            u4_mb_idx = u4_num_mbs;
            ps_dec->u4_mb_idx = u4_num_mbs;

        }
    }
    while(uc_more_data_flag);

    ps_dec->u4_num_mbs_cur_nmb = 0;
    ps_dec->ps_cur_slice->u4_mbs_in_slice = i4_cur_mb_addr

                        - (u2_first_mb_in_slice << u1_mbaff);

    return ret;
}

/*****************************************************************************/
/*                                                                           */
/*  Function Name : ih264d_parse_ipcm_mb                                       */
/*                                                                           */
/*  Description   : This function decodes the pixel values of I_PCM Mb.      */
/*                                                                           */
/*  Inputs        : ps_dec,  ps_cur_mb_info and mb number                          */
/*                                                                           */
/*  Description   : This function reads the luma and chroma pixels directly  */
/*                  from the bitstream when the mbtype is I_PCM and stores   */
/*                  them in recon buffer. If the entropy coding mode is      */
/*                  cabac, decoding engine is re-initialized. The nnzs and   */
/*                  cabac contexts are appropriately modified.               */
/*  Returns       : void                                                     */
/*                                                                           */
/*  Revision History:                                                        */
/*         DD MM YYYY   Author(s)       Changes (Describe the changes made)  */
/*         13 07 2002   Jay                                                  */
/*                                                                           */
/*****************************************************************************/

WORD32 ih264d_parse_ipcm_mb(dec_struct_t * ps_dec,
                          dec_mb_info_t *ps_cur_mb_info,
                          UWORD32 u4_mbNum)
{
    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD8 u1_mbaff = ps_dec->ps_cur_slice->u1_mbaff_frame_flag;
    UWORD8 *pu1_y, *pu1_u, *pu1_v;
    WORD32 ret;

    UWORD32 u4_rec_width_y, u4_rec_width_uv;
    UWORD32 u1_num_mb_pair;
    UWORD8 u1_x, u1_y;
    /* CHANGED CODE */
    tfr_ctxt_t *ps_frame_buf;
    UWORD8 u1_mb_field_decoding_flag;
    UWORD32 *pu4_buf;
    UWORD8 *pu1_buf;
    /* CHANGED CODE */

    if(ps_dec->u1_separate_parse)
    {
        ps_frame_buf = &ps_dec->s_tran_addrecon_parse;
    }
    else
    {
        ps_frame_buf = &ps_dec->s_tran_addrecon;
    }
    /* align bistream to byte boundary. */
    /* pcm_alignment_zero_bit discarded */
    /* For XX GotoByteBoundary */
    if(ps_bitstrm->u4_ofst & 0x07)
    {
        ps_bitstrm->u4_ofst += 8;
        ps_bitstrm->u4_ofst &= 0xFFFFFFF8;
    }

    /*  Store left Nnz as 16 for each 4x4 blk */

    pu1_buf = ps_dec->pu1_left_nnz_y;
    pu4_buf = (UWORD32 *)pu1_buf;
    *pu4_buf = 0x10101010;
    pu1_buf = ps_cur_mb_info->ps_curmb->pu1_nnz_y;
    pu4_buf = (UWORD32 *)pu1_buf;
    *pu4_buf = 0x10101010;
    pu1_buf = ps_cur_mb_info->ps_curmb->pu1_nnz_uv;
    pu4_buf = (UWORD32 *)pu1_buf;
    *pu4_buf = 0x10101010;
    pu1_buf = ps_dec->pu1_left_nnz_uv;
    pu4_buf = (UWORD32 *)pu1_buf;
    *pu4_buf = 0x10101010;
    ps_cur_mb_info->u1_cbp = 0xff;

    ps_dec->i1_prev_mb_qp_delta = 0;
    /* Get neighbour MB's */
    u1_num_mb_pair = (u4_mbNum >> u1_mbaff);

    /*****************************************************************************/
    /* calculate the RECON buffer YUV pointers for the PCM data                  */
    /*****************************************************************************/
    /* CHANGED CODE  */
    u1_mb_field_decoding_flag = ps_cur_mb_info->u1_mb_field_decodingflag;
    pu1_y = ps_frame_buf->pu1_dest_y + (u1_num_mb_pair << 4);
    pu1_u = ps_frame_buf->pu1_dest_u + (u1_num_mb_pair << 4);
    pu1_v = pu1_u + 1;

    u4_rec_width_y = ps_dec->u2_frm_wd_y << u1_mb_field_decoding_flag;
    u4_rec_width_uv = ps_dec->u2_frm_wd_uv << u1_mb_field_decoding_flag;
    /* CHANGED CODE  */

    if(u1_mbaff)
    {
        UWORD8 u1_top_mb;

        u1_top_mb = ps_cur_mb_info->u1_topmb;

        if(u1_top_mb == 0)
        {
            pu1_y += (u1_mb_field_decoding_flag ?
                            (u4_rec_width_y >> 1) : (u4_rec_width_y << 4));
            pu1_u += (u1_mb_field_decoding_flag ?
                            (u4_rec_width_uv) : (u4_rec_width_uv << 4));
            pu1_v = pu1_u + 1;
        }
    }

    /* Read Luma samples */
    for(u1_y = 0; u1_y < 16; u1_y++)
    {
        for(u1_x = 0; u1_x < 16; u1_x++)
            pu1_y[u1_x] = ih264d_get_bits_h264(ps_bitstrm, 8);

        pu1_y += u4_rec_width_y;
    }

    /* Read Chroma samples */
    for(u1_y = 0; u1_y < 8; u1_y++)
    {
        for(u1_x = 0; u1_x < 8; u1_x++)
            pu1_u[u1_x * YUV420SP_FACTOR] = ih264d_get_bits_h264(ps_bitstrm, 8);

        pu1_u += u4_rec_width_uv;
    }

    for(u1_y = 0; u1_y < 8; u1_y++)
    {
        for(u1_x = 0; u1_x < 8; u1_x++)
            pu1_v[u1_x * YUV420SP_FACTOR] = ih264d_get_bits_h264(ps_bitstrm, 8);

        pu1_v += u4_rec_width_uv;
    }

    if(CABAC == ps_dec->ps_cur_pps->u1_entropy_coding_mode)
    {
        UWORD32 *pu4_buf;
        UWORD8 *pu1_buf;
        ctxt_inc_mb_info_t *p_curr_ctxt = ps_dec->ps_curr_ctxt_mb_info;
        /* Re-initialize the cabac decoding engine. */
        ret = ih264d_init_cabac_dec_envirnoment(&(ps_dec->s_cab_dec_env), ps_bitstrm);
        if(ret != OK)
            return ret;
        /* update the cabac contetxs */
        p_curr_ctxt->u1_mb_type = CAB_I_PCM;
        p_curr_ctxt->u1_cbp = 47;
        p_curr_ctxt->u1_intra_chroma_pred_mode = 0;
        p_curr_ctxt->u1_transform8x8_ctxt = 0;
        ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

        pu1_buf = ps_dec->pu1_left_nnz_y;
        pu4_buf = (UWORD32 *)pu1_buf;
        *pu4_buf = 0x01010101;

        pu1_buf = ps_cur_mb_info->ps_curmb->pu1_nnz_y;
        pu4_buf = (UWORD32 *)pu1_buf;
        *pu4_buf = 0x01010101;

        pu1_buf = ps_cur_mb_info->ps_curmb->pu1_nnz_uv;
        pu4_buf = (UWORD32 *)pu1_buf;
        *pu4_buf = 0x01010101;

        pu1_buf = ps_dec->pu1_left_nnz_uv;
        pu4_buf = (UWORD32 *)pu1_buf;
        *pu4_buf = 0x01010101;

        p_curr_ctxt->u1_yuv_dc_csbp = 0x7;
        ps_dec->pu1_left_yuv_dc_csbp[0] = 0x7;
        if(ps_dec->ps_cur_slice->u1_slice_type != I_SLICE)
        {

            MEMSET_16BYTES(&ps_dec->pu1_left_mv_ctxt_inc[0][0], 0);
            memset(ps_dec->pi1_left_ref_idx_ctxt_inc, 0, 4);
            MEMSET_16BYTES(p_curr_ctxt->u1_mv, 0);
            memset(p_curr_ctxt->i1_ref_idx, 0, 4);

        }
    }
    return OK;
}

/*!
 **************************************************************************
 * \if Function name : ih264d_decode_islice \endif
 *
 * \brief
 *    Decodes an I Slice
 *
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_islice(dec_struct_t *ps_dec,
                            UWORD16 u2_first_mb_in_slice)
{
    dec_pic_params_t * ps_pps = ps_dec->ps_cur_pps;
    dec_slice_params_t * ps_slice = ps_dec->ps_cur_slice;
    UWORD32 *pu4_bitstrm_buf = ps_dec->ps_bitstrm->pu4_buffer;
    UWORD32 *pu4_bitstrm_ofst = &ps_dec->ps_bitstrm->u4_ofst;
    UWORD32 u4_temp;
    WORD32 i_temp;
    WORD64 i8_temp;
    WORD32 ret;

    /*--------------------------------------------------------------------*/
    /* Read remaining contents of the slice header                        */
    /*--------------------------------------------------------------------*/
    /* dec_ref_pic_marking function */
    /* G050 */
    if(ps_slice->u1_nal_ref_idc != 0)
    {
        if(!ps_dec->ps_dpb_cmds->u1_dpb_commands_read)
        {
            i_temp = ih264d_read_mmco_commands(ps_dec);
            if (i_temp < 0)
            {
                return ERROR_DBP_MANAGER_T;
            }
            ps_dec->u4_bitoffset = i_temp;
        }
        else
            ps_dec->ps_bitstrm->u4_ofst += ps_dec->u4_bitoffset;
    }
    /* G050 */

    /* Read slice_qp_delta */
    i8_temp = (WORD64)ps_pps->u1_pic_init_qp
                        + ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
    if((i8_temp < MIN_H264_QP) || (i8_temp > MAX_H264_QP))
        return ERROR_INV_RANGE_QP_T;
    ps_slice->u1_slice_qp = i8_temp;
    COPYTHECONTEXT("SH: slice_qp_delta",
                    ps_slice->u1_slice_qp - ps_pps->u1_pic_init_qp);

    if(ps_pps->u1_deblocking_filter_parameters_present_flag == 1)
    {
        u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        COPYTHECONTEXT("SH: disable_deblocking_filter_idc", u4_temp);

        if(u4_temp > SLICE_BOUNDARY_DBLK_DISABLED)
        {
            return ERROR_INV_SLICE_HDR_T;
        }
        ps_slice->u1_disable_dblk_filter_idc = u4_temp;
        if(u4_temp != 1)
        {
            i_temp = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf)
                            << 1;
            if((MIN_DBLK_FIL_OFF > i_temp) || (i_temp > MAX_DBLK_FIL_OFF))
            {
                return ERROR_INV_SLICE_HDR_T;
            }
            ps_slice->i1_slice_alpha_c0_offset = i_temp;
            COPYTHECONTEXT("SH: slice_alpha_c0_offset_div2",
                            ps_slice->i1_slice_alpha_c0_offset >> 1);

            i_temp = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf)
                            << 1;
            if((MIN_DBLK_FIL_OFF > i_temp) || (i_temp > MAX_DBLK_FIL_OFF))
            {
                return ERROR_INV_SLICE_HDR_T;
            }
            ps_slice->i1_slice_beta_offset = i_temp;
            COPYTHECONTEXT("SH: slice_beta_offset_div2",
                            ps_slice->i1_slice_beta_offset >> 1);

        }
        else
        {
            ps_slice->i1_slice_alpha_c0_offset = 0;
            ps_slice->i1_slice_beta_offset = 0;
        }
    }
    else
    {
        ps_slice->u1_disable_dblk_filter_idc = 0;
        ps_slice->i1_slice_alpha_c0_offset = 0;
        ps_slice->i1_slice_beta_offset = 0;
    }

    /* Initialization to check if number of motion vector per 2 Mbs */
    /* are exceeding the range or not */
    ps_dec->u2_mv_2mb[0] = 0;
    ps_dec->u2_mv_2mb[1] = 0;


    /*set slice header cone to 2 ,to indicate  correct header*/
    ps_dec->u1_slice_header_done = 2;

    if(ps_pps->u1_entropy_coding_mode)
    {
        SWITCHOFFTRACE; SWITCHONTRACECABAC;
        if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
        {
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cabac_mbaff;
        }
        else
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cabac_nonmbaff;

        ret = ih264d_parse_islice_data_cabac(ps_dec, ps_slice,
                                             u2_first_mb_in_slice);
        if(ret != OK)
            return ret;
        SWITCHONTRACE; SWITCHOFFTRACECABAC;
    }
    else
    {
        if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
        {
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cavlc_mbaff;
        }
        else
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cavlc_nonmbaff;
        ret = ih264d_parse_islice_data_cavlc(ps_dec, ps_slice,
                                       u2_first_mb_in_slice);
        if(ret != OK)
            return ret;
    }

    return OK;
}

Coverage Report

Created: 2026-05-30 06:23