vop_infor->tranp_buf += 4;
			if (0 == mby_indx) {
				for(i=0;i<4;i++){
					vop_infor->tranp_buf[i] = IPP_VIDEO_OPAQUE;
				}
			}			
            mv_cur_mb += 4;
            type_cur_mb ++;

            vop_infor->qp_buf ++;
            vop_infor->qp_buf[0] = vop_infor->cur_qp;
        
        } /* loop for each row */

        /* position the 1st MB in the next row of the VOP */
        vop_infor->cur_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->cur_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->cur_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;

        vop_infor->rec_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->rec_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->rec_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;

        vop_infor->fwd_ref_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->fwd_ref_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->fwd_ref_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;

        vop_infor->fwd_ref_rec_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->fwd_ref_rec_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->fwd_ref_rec_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;

        /* update dc coefficient of the 4th block in the last MB each row */
        vop_infor->coef_buf_row.y_ptr[-8] = vop_infor->coef_buf_col.y_ptr[8];

        /* restore ac/dc prediction coefficient row buffer ptrs */
        vop_infor->coef_buf_row.y_ptr  = enc_state->coef_buf_row.y_ptr
            + SAMPLE_VIDEO_MB_SIZE;
        vop_infor->coef_buf_row.cb_ptr = enc_state->coef_buf_row.cb_ptr
            + SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->coef_buf_row.cr_ptr = enc_state->coef_buf_row.cr_ptr
            + SAMPLE_VIDEO_BLOCK_SIZE;

        /* restore the dc coefficient on the left border */
        vop_infor->coef_buf_col.y_ptr [0] = -1;
        vop_infor->coef_buf_col.y_ptr [8] = -1;
        vop_infor->coef_buf_col.cb_ptr[0] = -1;
        vop_infor->coef_buf_col.cr_ptr[0] = -1;

        /* restore qp_buf ptr */
        vop_infor->qp_buf    = enc_state->qp_buf;
        vop_infor->qp_buf[0] = enc_state->qp_buf[enc_state->mb_per_row];

        vop_infor->tranp_buf = enc_state->tranp_buf;
        mv_cur_mb += 2 * 4;
    
    } /* loop for each column */
	return SAMPLE_STATUS_NOERR;
}

/******************************************************************************
// Name:        encode_ivop_mpeg4
// Desicription:
//      Encode the IVOP data in non-ER mode
//
//  Input Arguments:
//      stream_buf  - Pointer to the output video bitstream
//      enc_state   - Pointer to the general state struct of MPEG-4 encoder
//      vop_infor   - Pointer to the vop information struct of MPEG-4 encoder
//
//  Output Arguments:
//      stream_buf  - Pointer to the updated output video bitstream after
//                    compression
//      enc_state   - Pointer to the updated general state struct of MPEG-4
//                    encoder
//      vop_infor   - Pointer to the updated vop information struct of MPEG-4
//                    encoder
//
//  Returns:
//      SAMPLE_STATUS_NOERR      If succeeds
//      SAMPLE_STATUS_ERR        If encoding fails
//  Note:
//  
******************************************************************************/
sample_status encode_ivop_mpeg4(sample_bitstream  *stream_buf,
                                mp4_enc_state     *enc_state,
                                mp4_enc_vop_infor *vop_infor)
{
    int mby_indx = 0, mbx_indx = 0;
    sample_status ret_code;

    /* initialize high-level encoder state */
    init_vop_infor_enc_mpeg4(enc_state, vop_infor);
    
    /* dump vop header information into output stream */
    create_vop_header_mpeg4(stream_buf, enc_state, vop_infor);
    
    /* loop for each column */
    for (mby_indx = 0; mby_indx < enc_state->mb_per_col; mby_indx++) {
        /* loop for each row */
        for (mbx_indx = 0; mbx_indx < enc_state->mb_per_row; mbx_indx++) {
            
            /* determine the mb_type */
            /* rate control is not supported, so quant para doesn't change with
            // macroblocks or frames and mb_type is always IPP_VIDEO_INTRA */
            if (vop_infor->delta_qp) {
                vop_infor->mb_type = IPP_VIDEO_INTRA_Q;
            } else {
                vop_infor->mb_type = IPP_VIDEO_INTRA;
            }
            
            ret_code = encode_intra_mb_mpeg4(stream_buf, enc_state, vop_infor);
            if (SAMPLE_STATUS_NOERR != ret_code) {
                return ret_code;
            }

            vop_infor->mb_indx ++;

            vop_infor->cur_mb.y_ptr  += SAMPLE_VIDEO_MB_SIZE;
            vop_infor->cur_mb.cb_ptr += SAMPLE_VIDEO_BLOCK_SIZE;
            vop_infor->cur_mb.cr_ptr += SAMPLE_VIDEO_BLOCK_SIZE;

            vop_infor->rec_mb.y_ptr  += SAMPLE_VIDEO_MB_SIZE;
            vop_infor->rec_mb.cb_ptr += SAMPLE_VIDEO_BLOCK_SIZE;
            vop_infor->rec_mb.cr_ptr += SAMPLE_VIDEO_BLOCK_SIZE;
            
            vop_infor->coef_buf_row.y_ptr  += SAMPLE_VIDEO_MB_SIZE;
            vop_infor->coef_buf_row.cb_ptr += SAMPLE_VIDEO_BLOCK_SIZE;
            vop_infor->coef_buf_row.cr_ptr += SAMPLE_VIDEO_BLOCK_SIZE;

            /* update qp_buf ptr */
            vop_infor->qp_buf++;
            vop_infor->qp_buf[0] = vop_infor->cur_qp;
        }

        /* position the 1st MB in the next row of the VOP */
        vop_infor->cur_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->cur_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->cur_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;

        vop_infor->rec_mb.y_ptr  += enc_state->frame_step_set.y_step
            * SAMPLE_VIDEO_MB_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_MB_SIZE;
        vop_infor->rec_mb.cb_ptr += enc_state->frame_step_set.cb_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->rec_mb.cr_ptr += enc_state->frame_step_set.cr_step
            * SAMPLE_VIDEO_BLOCK_SIZE - enc_state->mb_per_row
            * SAMPLE_VIDEO_BLOCK_SIZE;


        /* update dc coefficient of the 4th block in the last MB each row */
        vop_infor->coef_buf_row.y_ptr[-8] = vop_infor->coef_buf_col.y_ptr[8];

        /* restore ac/dc prediction coefficient row buffer ptrs */
        vop_infor->coef_buf_row.y_ptr  = enc_state->coef_buf_row.y_ptr
            + SAMPLE_VIDEO_MB_SIZE;
        vop_infor->coef_buf_row.cb_ptr = enc_state->coef_buf_row.cb_ptr
            + SAMPLE_VIDEO_BLOCK_SIZE;
        vop_infor->coef_buf_row.cr_ptr = enc_state->coef_buf_row.cr_ptr
            + SAMPLE_VIDEO_BLOCK_SIZE;

        /* restore the dc coefficient on the left border */
        vop_infor->coef_buf_col.y_ptr [0] = -1;
        vop_infor->coef_buf_col.y_ptr [8] = -1;
        vop_infor->coef_buf_col.cb_ptr[0] = -1;
        vop_infor->coef_buf_col.cr_ptr[0] = -1;

        /* restore qp_buf ptr */
        vop_infor->qp_buf    = enc_state->qp_buf;
        vop_infor->qp_buf[0] = enc_state->qp_buf[enc_state->mb_per_row];
    }

    return SAMPLE_STATUS_NOERR;    
}

/******************************************************************************
// Name:            encode_mpeg4
// Description:     Frame encoding function for MPEG-4 baseline encoder,
//                  it includes preprocess for preparing VOP encoding,
//                  VOP encoding and postprocess for preparing output
//
// Input Arguments: 
//      stream_buf      Pointer to the output video bitstream
//      enc_state       Pointer to the general state struct of MPEG-4 encoder
//
//  Output Arguments:
//      stream_buf      Pointer to the updated output video bitstream after
//                      compression.
//      enc_state       Pointer to the updated general state struct of MPEG-4
//                      encoder.
//
//  Returns:    
//      SAMPLE_STATUS_NOERR             If succeeds
//      SAMPLE_STATUS_ERR               If encoding fails
******************************************************************************/

sample_status encode_mpeg4(sample_bitstream *stream_buf,
                           mp4_enc_state    *enc_state)
{
    mp4_enc_vop_infor   vop_infor;
    sample_status       ret_code;

    /* determine the vop_coding_type*/
    if (0 == (enc_state->vop_indx % (enc_state->ivop_interval + 1))) {
        enc_state->vop_coding_type = IVOP;
        ret_code = encode_ivop_mpeg4(stream_buf, enc_state, &vop_infor);
    } else {
        enc_state->vop_coding_type = PVOP;
        expand_frame_enc_mpeg4(enc_state);
        ret_code = encode_pvop_mpeg4(stream_buf, enc_state, &vop_infor);        
    }

    if (SAMPLE_STATUS_NOERR != ret_code) {
        return ret_code;
    }

    /* fill stuffing bits */
    if (!stream_buf->bs_cur_bitoffset) {
        stream_buf->bs_cur_byte[0]  = 0x7F;
    } else {
        stream_buf->bs_cur_byte[0] |=
            bits_stuf_tbl[7 - stream_buf->bs_cur_bitoffset];
        stream_buf->bs_cur_bitoffset = 0;
    }
    stream_buf->bs_cur_byte++;

    /* exchange between current and reference frame */
    set_ref_frame_enc_mpeg4(enc_state);

    /* update input info pic pointers */
    enc_state->info_pic->pic_plane[0] = enc_state->cur_frame.y_ptr;
    enc_state->info_pic->pic_plane[1] = enc_state->cur_frame.cb_ptr;
    enc_state->info_pic->pic_plane[2] = enc_state->cur_frame.cr_ptr;

    enc_state->vop_indx++;

    return SAMPLE_STATUS_NOERR;
}