/******************************************************************************

 *

 * 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

*/

#include <stdio.h>

#include <string.h>

#include "iv_datatypedef.h"

#include "iv.h"

#include "impeg2_buf_mgr.h"

#include "impeg2_disp_mgr.h"

#include "impeg2_defs.h"

#include "impeg2_platform_macros.h"

#include "impeg2_inter_pred.h"

#include "impeg2_idct.h"

#include "impeg2_globals.h"

#include "impeg2_format_conv.h"

#include "impeg2_macros.h"

#include "ivd.h"

#include "impeg2d.h"

#include "impeg2d_bitstream.h"

#include "impeg2d_structs.h"

#include "impeg2d_vld_tables.h"

#include "impeg2d_vld.h"

#include "impeg2d_pic_proc.h"

#include "impeg2d_debug.h"

#include "impeg2d_mc.h"

#define BLK_SIZE 8

#define LUMA_BLK_SIZE (2 * (BLK_SIZE))

#define CHROMA_BLK_SIZE (BLK_SIZE)

/*******************************************************************************

*

*  Function Name   : impeg2d_dec_p_mb_params

*

*  Description     : Decodes the parameters for P

*

*  Arguments       :

*  dec             : Decoder context

*

*  Values Returned : None

*******************************************************************************/

WORD32  impeg2d_dec_p_mb_params(dec_state_t *ps_dec)

{

    stream_t *ps_stream = &ps_dec->s_bit_stream;

    UWORD16 u2_mb_addr_incr;

    UWORD16 u2_total_len;

    UWORD16 u2_len;

    UWORD16 u2_mb_type;

    UWORD32 u4_next_word;

    const dec_mb_params_t *ps_dec_mb_params;

    if(impeg2d_bit_stream_nxt(ps_stream,1) == 1)

    {

        impeg2d_bit_stream_flush(ps_stream,1);

    }

    else

    {

        u2_mb_addr_incr = impeg2d_get_mb_addr_incr(ps_stream);

        if(!u2_mb_addr_incr)

        {

            return IV_FAIL;

        }

        if(0 == ps_dec->u2_first_mb)

        {

            /****************************************************************/

            /* If the 2nd member of a field picture pair is a P picture and */

            /* the first one was an I picture, there cannot be any skipped  */

            /* MBs in the second field picture                              */

            /****************************************************************/

            /*

            if((dec->picture_structure != FRAME_PICTURE) &&

                (dec->f->FieldFuncCall != 0) &&

                (dec->las->u1_last_coded_vop_type == I))

            {

                core0_err_handler((void *)(VOLParams),

                    ITTMPEG2_ERR_INVALID_MB_SKIP);

            }

            */

            /****************************************************************/

            /* In MPEG-2, the last MB of the row cannot be skipped and the  */

            /* MBAddrIncr cannot be such that it will take the current MB   */

            /* beyond the current row                                       */

            /* In MPEG-1, the slice could start and end anywhere and is not */

            /* restricted to a row like in MPEG-2. Hence this check should  */

            /* not be done for MPEG-1 streams.                              */

            /****************************************************************/

            if(ps_dec->u2_is_mpeg2 && ((ps_dec->u2_mb_x + u2_mb_addr_incr) > ps_dec->u2_num_horiz_mb) )

            {

                u2_mb_addr_incr    = ps_dec->u2_num_horiz_mb - ps_dec->u2_mb_x;

            }

            if ((u2_mb_addr_incr - 1) > ps_dec->u2_num_mbs_left)

            {

                /* If the number of skip MBs are more than the number of MBs

                 * left, indicate error.

                 */

                return IV_FAIL;

            }

            impeg2d_dec_skip_mbs(ps_dec, (UWORD16)(u2_mb_addr_incr - 1));

        }

        else

        {

            /****************************************************************/

            /* Section 6.3.17                                               */

            /* The first MB of a slice cannot be skipped                    */

            /* But the mb_addr_incr can be > 1, because at the beginning of */

            /* a slice, it indicates the offset from the last MB in the     */

            /* previous row. Hence for the first slice in a row, the        */

            /* mb_addr_incr needs to be 1.                                  */

            /****************************************************************/

            /* MB_x is set to zero whenever MB_y changes.                   */

            ps_dec->u2_mb_x = u2_mb_addr_incr - 1;

            /* For error resilience */

            ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));

            ps_dec->u2_num_mbs_left = ((ps_dec->u2_num_vert_mb - ps_dec->u2_mb_y)

                            * ps_dec->u2_num_horiz_mb) - ps_dec->u2_mb_x;

            /****************************************************************/

            /* mb_addr_incr is forced to 1 because in this decoder it is used */

            /* more as an indicator of the number of MBs skipped than the   */

            /* as defined by the standard (Section 6.3.17)                  */

            /****************************************************************/

            u2_mb_addr_incr = 1;

            ps_dec->u2_first_mb = 0;

        }

    }

    u4_next_word = (UWORD16)impeg2d_bit_stream_nxt(ps_stream,16);

    /*-----------------------------------------------------------------------*/

    /* MB type                                                               */

    /*-----------------------------------------------------------------------*/

    {

        u2_mb_type   = ps_dec->pu2_mb_type[BITS((UWORD16)u4_next_word,15,10)];

        u2_len      = BITS(u2_mb_type,15,8);

        u2_total_len = u2_len;

        u4_next_word = (UWORD16)LSW((UWORD16)u4_next_word << u2_len);

    }

    /*-----------------------------------------------------------------------*/

    /* motion type                                                           */

    /*-----------------------------------------------------------------------*/

    {

        if((u2_mb_type & MB_FORW_OR_BACK) &&  ps_dec->u2_read_motion_type)

        {

            WORD32 i4_motion_type;

            ps_dec->u2_motion_type = BITS((UWORD16)u4_next_word,15,14);

            u2_total_len        += MB_MOTION_TYPE_LEN;

            u4_next_word        = (UWORD16)LSW((UWORD16)u4_next_word << MB_MOTION_TYPE_LEN);

            i4_motion_type     = ps_dec->u2_motion_type;

            if((i4_motion_type == 0) ||

                (i4_motion_type == 4) ||

                (i4_motion_type >  7))

            {

                //TODO : VANG Check for validity

                i4_motion_type = 1;

            }

        }

    }

    /*-----------------------------------------------------------------------*/

    /* dct type                                                              */

    /*-----------------------------------------------------------------------*/

    {

        if((u2_mb_type & MB_CODED) && ps_dec->u2_read_dct_type)

        {

            ps_dec->u2_field_dct = BIT((UWORD16)u4_next_word,15);

            u2_total_len += MB_DCT_TYPE_LEN;

            u4_next_word = (UWORD16)LSW((UWORD16)u4_next_word << MB_DCT_TYPE_LEN);

        }

    }

    /*-----------------------------------------------------------------------*/

    /* Quant scale code                                                      */

    /*-----------------------------------------------------------------------*/

    if(u2_mb_type & MB_QUANT)

    {

        UWORD16 u2_quant_scale_code;

        u2_quant_scale_code = BITS((UWORD16)u4_next_word,15,11);

        ps_dec->u1_quant_scale = (ps_dec->u2_q_scale_type) ?

            gau1_impeg2_non_linear_quant_scale[u2_quant_scale_code] : (u2_quant_scale_code << 1);

        u2_total_len += MB_QUANT_SCALE_CODE_LEN;

    }

    impeg2d_bit_stream_flush(ps_stream,u2_total_len);

    /*-----------------------------------------------------------------------*/

    /* Set the function pointers                                             */

    /*-----------------------------------------------------------------------*/

    ps_dec->u2_coded_mb    = (UWORD16)(u2_mb_type & MB_CODED);

    if(u2_mb_type & MB_FORW_OR_BACK)

    {

        UWORD16 refPic      = !(u2_mb_type & MB_MV_FORW);

        UWORD16 index       = (ps_dec->u2_motion_type);

        ps_dec->u2_prev_intra_mb    = 0;

        ps_dec->e_mb_pred         = (e_pred_direction_t)refPic;

        ps_dec_mb_params = &ps_dec->ps_func_forw_or_back[index];

        ps_dec->s_mb_type = ps_dec_mb_params->s_mb_type;

        if(NULL == ps_dec_mb_params->pf_func_mb_params)

            return -1;

        ps_dec_mb_params->pf_func_mb_params(ps_dec);

    }

    else if(u2_mb_type & MB_TYPE_INTRA)

    {

        ps_dec->u2_prev_intra_mb    = 1;

        impeg2d_dec_intra_mb(ps_dec);

    }

    else

    {

        ps_dec->u2_prev_intra_mb    = 0;

        ps_dec->e_mb_pred = FORW;

        ps_dec->u2_motion_type = 0;

        impeg2d_dec_0mv_coded_mb(ps_dec);

    }

    /*-----------------------------------------------------------------------*/

    /* decode cbp                                                            */

    /*-----------------------------------------------------------------------*/

    if((u2_mb_type & MB_TYPE_INTRA))

    {

        ps_dec->u2_cbp  = 0x3f;

        ps_dec->u2_prev_intra_mb    = 1;

    }

    else

    {

        ps_dec->u2_prev_intra_mb  = 0;

        ps_dec->u2_def_dc_pred[Y_LUMA] = 128 << ps_dec->u2_intra_dc_precision;

        ps_dec->u2_def_dc_pred[U_CHROMA] = 128 << ps_dec->u2_intra_dc_precision;

        ps_dec->u2_def_dc_pred[V_CHROMA] = 128 << ps_dec->u2_intra_dc_precision;

        if((ps_dec->u2_coded_mb))

        {

            UWORD16 cbpValue;

            cbpValue  = gau2_impeg2d_cbp_code[impeg2d_bit_stream_nxt(ps_stream,MB_CBP_LEN)];

            ps_dec->u2_cbp  = cbpValue & 0xFF;

            impeg2d_bit_stream_flush(ps_stream,(cbpValue >> 8) & 0x0FF);

        }

        else

        {

            ps_dec->u2_cbp  = 0;

        }

    }

    return 0;

}

/*******************************************************************************

*

*  Function Name   : impeg2d_dec_pnb_mb_params

*

*  Description     : Decodes the parameters for P and B pictures

*

*  Arguments       :

*  dec             : Decoder context

*

*  Values Returned : None

*******************************************************************************/

WORD32 impeg2d_dec_pnb_mb_params(dec_state_t *ps_dec)

{

    stream_t *ps_stream = &ps_dec->s_bit_stream;

    UWORD16 u2_mb_addr_incr;

    UWORD16 u2_total_len;

    UWORD16 u2_len;

    UWORD16 u2_mb_type;

    UWORD32 u4_next_word;

    const dec_mb_params_t *ps_dec_mb_params;

    if(impeg2d_bit_stream_nxt(ps_stream,1) == 1)

    {

        impeg2d_bit_stream_flush(ps_stream,1);

    }

    else

    {

        u2_mb_addr_incr = impeg2d_get_mb_addr_incr(ps_stream);

        if(0 == u2_mb_addr_incr)

        {

            return IV_FAIL;

        }

        if(ps_dec->u2_first_mb)

        {

            /****************************************************************/

            /* Section 6.3.17                                               */

            /* The first MB of a slice cannot be skipped                    */

            /* But the mb_addr_incr can be > 1, because at the beginning of */

            /* a slice, it indicates the offset from the last MB in the     */

            /* previous row. Hence for the first slice in a row, the        */

            /* mb_addr_incr needs to be 1.                                  */

            /****************************************************************/

            /* MB_x is set to zero whenever MB_y changes.                   */

            ps_dec->u2_mb_x = u2_mb_addr_incr - 1;

            /* For error resilience */

            ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));

            ps_dec->u2_num_mbs_left = ((ps_dec->u2_num_vert_mb - ps_dec->u2_mb_y)

                            * ps_dec->u2_num_horiz_mb) - ps_dec->u2_mb_x;

            /****************************************************************/

            /* mb_addr_incr is forced to 1 because in this decoder it is used */

            /* more as an indicator of the number of MBs skipped than the   */

            /* as defined by the standard (Section 6.3.17)                  */

            /****************************************************************/

            u2_mb_addr_incr = 1;

            ps_dec->u2_first_mb = 0;

        }

        else

        {

            /****************************************************************/

            /* In MPEG-2, the last MB of the row cannot be skipped and the  */

            /* mb_addr_incr cannot be such that it will take the current MB   */

            /* beyond the current row                                       */

            /* In MPEG-1, the slice could start and end anywhere and is not */

            /* restricted to a row like in MPEG-2. Hence this check should  */

            /* not be done for MPEG-1 streams.                              */

            /****************************************************************/

            if(ps_dec->u2_is_mpeg2 &&

                ((ps_dec->u2_mb_x + u2_mb_addr_incr) > ps_dec->u2_num_horiz_mb))

            {

                u2_mb_addr_incr    = ps_dec->u2_num_horiz_mb - ps_dec->u2_mb_x;

            }

            if ((u2_mb_addr_incr - 1) > ps_dec->u2_num_mbs_left)

            {

                /* If the number of skip MBs are more than the number of MBs

                 * left, indicate error.

                 */

                return IV_FAIL;

            }

            impeg2d_dec_skip_mbs(ps_dec, (UWORD16)(u2_mb_addr_incr - 1));

        }

    }

    u4_next_word = (UWORD16)impeg2d_bit_stream_nxt(ps_stream,16);

    /*-----------------------------------------------------------------------*/

    /* MB type                                                               */

    /*-----------------------------------------------------------------------*/

    {

        u2_mb_type   = ps_dec->pu2_mb_type[BITS((UWORD16)u4_next_word,15,10)];

        u2_len      = BITS(u2_mb_type,15,8);

        u2_total_len = u2_len;

        u4_next_word = (UWORD16)LSW((UWORD16)u4_next_word << u2_len);

    }

    /*-----------------------------------------------------------------------*/

    /* motion type                                                           */

    /*-----------------------------------------------------------------------*/

    {

        WORD32 i4_motion_type = ps_dec->u2_motion_type;

        if((u2_mb_type & MB_FORW_OR_BACK) &&  ps_dec->u2_read_motion_type)

        {

            ps_dec->u2_motion_type = BITS((UWORD16)u4_next_word,15,14);

            u2_total_len += MB_MOTION_TYPE_LEN;

            u4_next_word = (UWORD16)LSW((UWORD16)u4_next_word << MB_MOTION_TYPE_LEN);

            i4_motion_type     = ps_dec->u2_motion_type;

        }

        if ((u2_mb_type & MB_FORW_OR_BACK) &&

            ((i4_motion_type == 0) ||

            (i4_motion_type == 3) ||

            (i4_motion_type == 4) ||

            (i4_motion_type >= 7)))

        {

            //TODO: VANG Check for validity

            i4_motion_type = 1;

        }

    }

    /*-----------------------------------------------------------------------*/

    /* dct type                                                              */

    /*-----------------------------------------------------------------------*/

    {

        if((u2_mb_type & MB_CODED) && ps_dec->u2_read_dct_type)

        {

            ps_dec->u2_field_dct = BIT((UWORD16)u4_next_word,15);

            u2_total_len += MB_DCT_TYPE_LEN;

            u4_next_word = (UWORD16)LSW((UWORD16)u4_next_word << MB_DCT_TYPE_LEN);

        }

    }

    /*-----------------------------------------------------------------------*/

    /* Quant scale code                                                      */

    /*-----------------------------------------------------------------------*/

    if(u2_mb_type & MB_QUANT)

    {

        UWORD16 u2_quant_scale_code;

        u2_quant_scale_code = BITS((UWORD16)u4_next_word,15,11);

        ps_dec->u1_quant_scale = (ps_dec->u2_q_scale_type) ?

            gau1_impeg2_non_linear_quant_scale[u2_quant_scale_code] : (u2_quant_scale_code << 1);

        u2_total_len += MB_QUANT_SCALE_CODE_LEN;

    }

    impeg2d_bit_stream_flush(ps_stream,u2_total_len);

    /*-----------------------------------------------------------------------*/

    /* Set the function pointers                                             */

    /*-----------------------------------------------------------------------*/

    ps_dec->u2_coded_mb    = (UWORD16)(u2_mb_type & MB_CODED);

    if(u2_mb_type & MB_BIDRECT)

    {

        UWORD16 u2_index       = (ps_dec->u2_motion_type);

        ps_dec->u2_prev_intra_mb    = 0;

        ps_dec->e_mb_pred         = BIDIRECT;

        ps_dec_mb_params = &ps_dec->ps_func_bi_direct[u2_index];

        ps_dec->s_mb_type = ps_dec_mb_params->s_mb_type;

        if(NULL == ps_dec_mb_params->pf_func_mb_params)

            return -1;

        ps_dec_mb_params->pf_func_mb_params(ps_dec);

    }

    else if(u2_mb_type & MB_FORW_OR_BACK)

    {

        UWORD16 u2_refPic      = !(u2_mb_type & MB_MV_FORW);

        UWORD16 u2_index       = (ps_dec->u2_motion_type);

        ps_dec->u2_prev_intra_mb    = 0;

        ps_dec->e_mb_pred         = (e_pred_direction_t)u2_refPic;

        ps_dec_mb_params = &ps_dec->ps_func_forw_or_back[u2_index];

        ps_dec->s_mb_type = ps_dec_mb_params->s_mb_type;

        if(NULL == ps_dec_mb_params->pf_func_mb_params)

            return -1;

        ps_dec_mb_params->pf_func_mb_params(ps_dec);

    }

    else if(u2_mb_type & MB_TYPE_INTRA)

    {

        ps_dec->u2_prev_intra_mb    = 1;

        impeg2d_dec_intra_mb(ps_dec);

    }

    else

    {

        ps_dec->u2_prev_intra_mb =0;

        ps_dec->e_mb_pred = FORW;

        ps_dec->u2_motion_type = 0;

        impeg2d_dec_0mv_coded_mb(ps_dec);

    }

    /*-----------------------------------------------------------------------*/

    /* decode cbp                                                            */

    /*-----------------------------------------------------------------------*/

    if((u2_mb_type & MB_TYPE_INTRA))

    {

        ps_dec->u2_cbp  = 0x3f;

        ps_dec->u2_prev_intra_mb    = 1;

    }

    else

    {

        ps_dec->u2_prev_intra_mb  = 0;

        ps_dec->u2_def_dc_pred[Y_LUMA] = 128 << ps_dec->u2_intra_dc_precision;

        ps_dec->u2_def_dc_pred[U_CHROMA] = 128 << ps_dec->u2_intra_dc_precision;

        ps_dec->u2_def_dc_pred[V_CHROMA] = 128 << ps_dec->u2_intra_dc_precision;

        if((ps_dec->u2_coded_mb))

        {

            UWORD16 cbpValue;

            cbpValue  = gau2_impeg2d_cbp_code[impeg2d_bit_stream_nxt(ps_stream,MB_CBP_LEN)];

            ps_dec->u2_cbp  = cbpValue & 0xFF;

            impeg2d_bit_stream_flush(ps_stream,(cbpValue >> 8) & 0x0FF);

        }

        else

        {

            ps_dec->u2_cbp  = 0;

        }

    }

    return 0;

}

/*******************************************************************************

*  Function Name   : impeg2d_dec_p_b_slice

*

*  Description     : Decodes P and B slices

*

*  Arguments       :

*  dec             : Decoder state

*

*  Values Returned : None

*******************************************************************************/

IMPEG2D_ERROR_CODES_T impeg2d_dec_p_b_slice(dec_state_t *ps_dec)

{

    WORD16 *pi2_vld_out;

    UWORD32 i;

    yuv_buf_t *ps_cur_frm_buf      = &ps_dec->s_cur_frm_buf;

    UWORD32 u4_frm_offset          = 0;

    const dec_mb_params_t *ps_dec_mb_params;

    IMPEG2D_ERROR_CODES_T e_error   = (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;

    pi2_vld_out = ps_dec->ai2_vld_buf;

    memset(ps_dec->ai2_pred_mv,0,sizeof(ps_dec->ai2_pred_mv));

    ps_dec->u2_prev_intra_mb    = 0;

    ps_dec->u2_first_mb       = 1;

    ps_dec->u2_picture_width = ps_dec->u2_frame_width;

    if(ps_dec->u2_picture_structure != FRAME_PICTURE)

    {

        ps_dec->u2_picture_width <<= 1;

        if(ps_dec->u2_picture_structure == BOTTOM_FIELD)

        {

            u4_frm_offset = ps_dec->u2_frame_width;

        }

    }

    do

    {

        UWORD32 u4_x_offset, u4_y_offset;

        WORD32 ret;

        UWORD32 u4_x_dst_offset = 0;

        UWORD32 u4_y_dst_offset = 0;

        UWORD8  *pu1_out_p;

        UWORD8  *pu1_pred;

        WORD32 u4_pred_strd;

        IMPEG2D_TRACE_MB_START(ps_dec->u2_mb_x, ps_dec->u2_mb_y);

        if(ps_dec->e_pic_type == B_PIC)

            ret = impeg2d_dec_pnb_mb_params(ps_dec);

        else

            ret = impeg2d_dec_p_mb_params(ps_dec);

        if(ret)

            return IMPEG2D_MB_TEX_DECODE_ERR;

        if(0 >= ps_dec->u2_num_mbs_left)

        {

            break;

        }

        IMPEG2D_TRACE_MB_START(ps_dec->u2_mb_x, ps_dec->u2_mb_y);

        u4_x_dst_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);

        u4_y_dst_offset = (ps_dec->u2_mb_y << 4) * ps_dec->u2_picture_width;

        pu1_out_p = ps_cur_frm_buf->pu1_y + u4_x_dst_offset + u4_y_dst_offset;

        if(ps_dec->u2_prev_intra_mb == 0)

        {

            UWORD32 offset_x, offset_y, stride;

            UWORD16 index = (ps_dec->u2_motion_type);

            /*only for non intra mb's*/

            if(ps_dec->e_mb_pred == BIDIRECT)

            {

                ps_dec_mb_params = &ps_dec->ps_func_bi_direct[index];

            }

            else

            {

                ps_dec_mb_params = &ps_dec->ps_func_forw_or_back[index];

            }

            stride = ps_dec->u2_picture_width;

            offset_x = u4_frm_offset + (ps_dec->u2_mb_x << 4);

            offset_y = (ps_dec->u2_mb_y << 4);

            ps_dec->s_dest_buf.pu1_y = ps_cur_frm_buf->pu1_y + offset_y * stride + offset_x;

            stride = stride >> 1;

            ps_dec->s_dest_buf.pu1_u = ps_cur_frm_buf->pu1_u + (offset_y >> 1) * stride

                            + (offset_x >> 1);

            ps_dec->s_dest_buf.pu1_v = ps_cur_frm_buf->pu1_v + (offset_y >> 1) * stride

                            + (offset_x >> 1);

            PROFILE_DISABLE_MC_IF0

            ps_dec_mb_params->pf_mc(ps_dec);

        }

        for(i = 0; i < NUM_LUMA_BLKS; ++i)

        {

            if((ps_dec->u2_cbp & (1 << (BLOCKS_IN_MB - 1 - i))) != 0)

            {

                e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out, ps_dec->pu1_inv_scan_matrix,

                              ps_dec->u2_prev_intra_mb, Y_LUMA, 0);

                if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)

                {

                    return e_error;

                }

                u4_x_offset = gai2_impeg2_blk_x_off[i];

                if(ps_dec->u2_field_dct == 0)

                    u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;

                else

                    u4_y_offset = gai2_impeg2_blk_y_off_fld[i] ;

                IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);

                PROFILE_DISABLE_IDCT_IF0

                {

                    WORD32 idx;

                    if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

                        idx = 0;

                    else

                        idx = 1;

                    if(0 == ps_dec->u2_prev_intra_mb)

                    {

                        pu1_pred = pu1_out_p + u4_y_offset * ps_dec->u2_picture_width + u4_x_offset;

                        u4_pred_strd = ps_dec->u2_picture_width << ps_dec->u2_field_dct;

                    }

                    else

                    {

                        pu1_pred = (UWORD8 *)gau1_impeg2_zerobuf;

                        u4_pred_strd = 8;

                    }

                    ps_dec->pf_idct_recon[idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,

                                                            ps_dec->ai2_idct_stg1,

                                                            pu1_pred,

                                                            pu1_out_p + u4_y_offset * ps_dec->u2_picture_width + u4_x_offset,

                                                            8,

                                                            u4_pred_strd,

                                                            ps_dec->u2_picture_width << ps_dec->u2_field_dct,

                                                            ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);

                }

            }

        }

        /* For U and V blocks, divide the x and y offsets by 2. */

        u4_x_dst_offset >>= 1;

        u4_y_dst_offset >>= 2;

        /* In case of chrominance blocks the DCT will be frame DCT */

        /* i = 0, U component and i = 1 is V componet */

        if((ps_dec->u2_cbp & 0x02) != 0)

        {

            pu1_out_p = ps_cur_frm_buf->pu1_u + u4_x_dst_offset + u4_y_dst_offset;

            e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out, ps_dec->pu1_inv_scan_matrix,

                          ps_dec->u2_prev_intra_mb, U_CHROMA, 0);

            if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)

            {

                return e_error;

            }

            IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);

            PROFILE_DISABLE_IDCT_IF0

            {

                WORD32 idx;

                if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

                    idx = 0;

                else

                    idx = 1;

                if(0 == ps_dec->u2_prev_intra_mb)

                {

                    pu1_pred = pu1_out_p;

                    u4_pred_strd = ps_dec->u2_picture_width >> 1;

                }

                else

                {

                    pu1_pred = (UWORD8 *)gau1_impeg2_zerobuf;

                    u4_pred_strd = 8;

                }

                ps_dec->pf_idct_recon[idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,

                                                        ps_dec->ai2_idct_stg1,

                                                        pu1_pred,

                                                        pu1_out_p,

                                                        8,

                                                        u4_pred_strd,

                                                        ps_dec->u2_picture_width >> 1,

                                                        ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);

            }

        }

        if((ps_dec->u2_cbp & 0x01) != 0)

        {

            pu1_out_p = ps_cur_frm_buf->pu1_v + u4_x_dst_offset + u4_y_dst_offset;

            e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out, ps_dec->pu1_inv_scan_matrix,

                          ps_dec->u2_prev_intra_mb, V_CHROMA, 0);

            if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)

            {

                return e_error;

            }

            IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);

            PROFILE_DISABLE_IDCT_IF0

            {

                WORD32 idx;

                if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

                    idx = 0;

                else

                    idx = 1;

                if(0 == ps_dec->u2_prev_intra_mb)

                {

                    pu1_pred = pu1_out_p;

                    u4_pred_strd = ps_dec->u2_picture_width >> 1;

                }

                else

                {

                    pu1_pred = (UWORD8 *)gau1_impeg2_zerobuf;

                    u4_pred_strd = 8;

                }

                ps_dec->pf_idct_recon[idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,

                                                        ps_dec->ai2_idct_stg1,

                                                        pu1_pred,

                                                        pu1_out_p,

                                                        8,

                                                        u4_pred_strd,

                                                        ps_dec->u2_picture_width >> 1,

                                                        ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);

            }

        }

        ps_dec->u2_num_mbs_left--;

        ps_dec->u2_first_mb = 0;

        ps_dec->u2_mb_x++;

        if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)

        {

            return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;

        }

        else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)

        {

            ps_dec->u2_mb_x = 0;

            ps_dec->u2_mb_y++;

        }

    }

    while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);

    return e_error;

}