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217 lines
6.2 KiB
C
217 lines
6.2 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/**
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*******************************************************************************
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* @file
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* ih264_ihadamard_scaling.c
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*
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* @brief
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* Contains definition of functions for h264 inverse hadamard 4x4 transform and scaling
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*
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* @author
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* Mohit
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*
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* @par List of Functions:
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* - ih264_ihadamard_scaling_4x4()
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*
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* @remarks
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*
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*******************************************************************************
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*/
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/*****************************************************************************/
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/* File Includes */
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/*****************************************************************************/
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/* User include files */
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#include "ih264_typedefs.h"
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#include "ih264_defs.h"
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#include "ih264_trans_macros.h"
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#include "ih264_macros.h"
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#include "ih264_trans_data.h"
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#include "ih264_size_defs.h"
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#include "ih264_structs.h"
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#include "ih264_trans_quant_itrans_iquant.h"
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/*
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********************************************************************************
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*
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* @brief This function performs a 4x4 inverse hadamard transform on the 4x4 DC coefficients
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* of a 16x16 intra prediction macroblock, and then performs scaling.
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* prediction buffer
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*
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* @par Description:
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* The DC coefficients pass through a 2-stage inverse hadamard transform.
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* This inverse transformed content is scaled to based on Qp value.
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*
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* @param[in] pi2_src
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* input 4x4 block of DC coefficients
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*
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* @param[out] pi2_out
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* output 4x4 block
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*
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* @param[in] pu2_iscal_mat
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* pointer to scaling list
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*
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* @param[in] pu2_weigh_mat
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* pointer to weight matrix
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*
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* @param[in] u4_qp_div_6
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* Floor (qp/6)
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*
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* @param[in] pi4_tmp
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* temporary buffer of size 1*16
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*
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* @returns none
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*
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* @remarks none
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*
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*******************************************************************************
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*/
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void ih264_ihadamard_scaling_4x4(WORD16* pi2_src,
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WORD16* pi2_out,
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const UWORD16 *pu2_iscal_mat,
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const UWORD16 *pu2_weigh_mat,
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UWORD32 u4_qp_div_6,
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WORD32* pi4_tmp)
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{
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WORD32 i;
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WORD32 x0, x1, x2, x3, x4, x5, x6, x7;
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WORD16* pi2_src_ptr, *pi2_out_ptr;
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WORD32* pi4_tmp_ptr;
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WORD32 rnd_fact = (u4_qp_div_6 < 6) ? (1 << (5 - u4_qp_div_6)) : 0;
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pi4_tmp_ptr = pi4_tmp;
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pi2_src_ptr = pi2_src;
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pi2_out_ptr = pi2_out;
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// Horizontal transform
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for(i = 0; i < SUB_BLK_WIDTH_4x4; i++)
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{
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x4 = pi2_src_ptr[0];
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x5 = pi2_src_ptr[1];
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x6 = pi2_src_ptr[2];
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x7 = pi2_src_ptr[3];
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x0 = x4 + x7;
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x1 = x5 + x6;
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x2 = x5 - x6;
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x3 = x4 - x7;
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pi4_tmp_ptr[0] = x0 + x1;
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pi4_tmp_ptr[1] = x2 + x3;
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pi4_tmp_ptr[2] = x0 - x1;
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pi4_tmp_ptr[3] = x3 - x2;
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pi4_tmp_ptr += SUB_BLK_WIDTH_4x4;
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pi2_src_ptr += SUB_BLK_WIDTH_4x4;
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}
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pi4_tmp_ptr = pi4_tmp;
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// Vertical Transform
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for(i = 0; i < SUB_BLK_WIDTH_4x4; i++)
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{
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x4 = pi4_tmp_ptr[0];
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x5 = pi4_tmp_ptr[4];
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x6 = pi4_tmp_ptr[8];
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x7 = pi4_tmp_ptr[12];
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x0 = x4 + x7;
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x1 = x5 + x6;
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x2 = x5 - x6;
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x3 = x4 - x7;
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pi4_tmp_ptr[0] = x0 + x1;
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pi4_tmp_ptr[4] = x2 + x3;
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pi4_tmp_ptr[8] = x0 - x1;
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pi4_tmp_ptr[12] = x3 - x2;
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pi4_tmp_ptr++;
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}
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pi4_tmp_ptr = pi4_tmp;
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//Scaling
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for(i = 0; i < (SUB_BLK_WIDTH_4x4 * SUB_BLK_WIDTH_4x4); i++)
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{
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INV_QUANT(pi4_tmp_ptr[i], pu2_iscal_mat[0], pu2_weigh_mat[0], u4_qp_div_6,
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rnd_fact, 6);
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pi2_out_ptr[i] = pi4_tmp_ptr[i];
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}
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}
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void ih264_ihadamard_scaling_2x2_uv(WORD16* pi2_src,
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WORD16* pi2_out,
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const UWORD16 *pu2_iscal_mat,
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const UWORD16 *pu2_weigh_mat,
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UWORD32 u4_qp_div_6,
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WORD32* pi4_tmp)
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{
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WORD32 i4_x0,i4_x1,i4_x2,i4_x3,i4_x4,i4_x5,i4_x6,i4_x7;
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WORD32 i4_y0,i4_y1,i4_y2,i4_y3,i4_y4,i4_y5,i4_y6,i4_y7;
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UNUSED(pi4_tmp);
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i4_x4 = pi2_src[0];
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i4_x5 = pi2_src[1];
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i4_x6 = pi2_src[2];
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i4_x7 = pi2_src[3];
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i4_x0 = i4_x4 + i4_x5;
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i4_x1 = i4_x4 - i4_x5;
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i4_x2 = i4_x6 + i4_x7;
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i4_x3 = i4_x6 - i4_x7;
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i4_x4 = i4_x0+i4_x2;
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i4_x5 = i4_x1+i4_x3;
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i4_x6 = i4_x0-i4_x2;
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i4_x7 = i4_x1-i4_x3;
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INV_QUANT(i4_x4,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_x5,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_x6,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_x7,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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pi2_out[0] = i4_x4;
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pi2_out[1] = i4_x5;
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pi2_out[2] = i4_x6;
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pi2_out[3] = i4_x7;
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i4_y4 = pi2_src[4];
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i4_y5 = pi2_src[5];
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i4_y6 = pi2_src[6];
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i4_y7 = pi2_src[7];
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i4_y0 = i4_y4 + i4_y5;
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i4_y1 = i4_y4 - i4_y5;
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i4_y2 = i4_y6 + i4_y7;
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i4_y3 = i4_y6 - i4_y7;
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i4_y4 = i4_y0+i4_y2;
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i4_y5 = i4_y1+i4_y3;
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i4_y6 = i4_y0-i4_y2;
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i4_y7 = i4_y1-i4_y3;
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INV_QUANT(i4_y4,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_y5,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_y6,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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INV_QUANT(i4_y7,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5);
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pi2_out[4] = i4_y4;
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pi2_out[5] = i4_y5;
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pi2_out[6] = i4_y6;
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pi2_out[7] = i4_y7;
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}
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