/******************************************************************************
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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_chroma_intra_pred_filters.c
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*
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* @brief
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* Contains function definitions for chroma intra prediction filters
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*
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* @author
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* Ittiam
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*
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* @par List of Functions:
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* -ih264_intra_pred_chroma_8x8_mode_dc
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* -ih264_intra_pred_chroma_8x8_mode_horz
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* -ih264_intra_pred_chroma_8x8_mode_vert
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* -ih264_intra_pred_chroma_8x8_mode_plane
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*
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* @remarks
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* None
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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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/* System include files */
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#include <stdio.h>
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#include <stddef.h>
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#include <string.h>
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/* User include files */
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#include "ih264_defs.h"
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#include "ih264_typedefs.h"
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#include "ih264_macros.h"
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#include "ih264_platform_macros.h"
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#include "ih264_intra_pred_filters.h"
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/* Global variables used only in assembly files*/
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const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs1[] =
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{ 0x01,0x00,0x01,0x00,
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0x02,0x00,0x02,0x00,
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0x03,0x00,0x03,0x00,
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0x04,0x00,0x04,0x00
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};
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const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs2[] =
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{ 0xfd,0xff,0xfe,0xff,
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0xff,0xff,0x00,0x00,
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0x01,0x00,0x02,0x00,
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0x03,0x00,0x04,0x00,
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};
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/*****************************************************************************/
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/* Chroma Intra prediction 8x8 filters */
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/*****************************************************************************/
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/**
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*******************************************************************************
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*
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* ih264_intra_pred_chroma_8x8_mode_dc
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*
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* @brief
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* Perform Intra prediction for chroma_8x8 mode:DC
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*
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* @par Description:
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* Perform Intra prediction for chroma_8x8 mode:DC ,described in sec 8.3.4.1
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*
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* @param[in] pu1_src
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* UWORD8 pointer to the source containing alternate U and V samples
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*
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* @param[out] pu1_dst
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* UWORD8 pointer to the destination with alternate U and V samples
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*
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* @param[in] src_strd
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* integer source stride
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*
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* @param[in] dst_strd
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* integer destination stride
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*
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** @param[in] ngbr_avail
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* availability of neighbouring pixels
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*
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* @returns
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*
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* @remarks
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* None
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*
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******************************************************************************
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*/
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void ih264_intra_pred_chroma_8x8_mode_dc(UWORD8 *pu1_src,
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UWORD8 *pu1_dst,
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WORD32 src_strd,
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WORD32 dst_strd,
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WORD32 ngbr_avail)
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{
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WORD32 left_avail, left_avail1, left_avail2; /* availability of left predictors (only for DC) */
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WORD32 top_avail; /* availability of top predictors (only for DC) */
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UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */
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UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */
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/* temporary variables to store accumulated first left half,second left half,
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* first top half,second top half of U and V values*/
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WORD32 val_u_l1 = 0, val_u_l2 = 0, val_u_t1 = 0, val_u_t2 = 0;
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WORD32 val_v_l1 = 0, val_v_l2 = 0, val_v_t1 = 0, val_v_t2 = 0;
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WORD32 val_u1 = 0, val_u2 = 0, val_v1 = 0, val_v2 = 0;
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WORD32 col, row; /*loop variables*/
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UNUSED(src_strd);
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left_avail = ngbr_avail & 0x11;
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left_avail1 = ngbr_avail & 1;
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left_avail2 = (ngbr_avail >> 4) & 1;
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top_avail = (ngbr_avail >> 2) & 1;
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pu1_top = pu1_src + 2 * BLK8x8SIZE + 2;
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pu1_left = pu1_src + 2 * BLK8x8SIZE - 2;
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if(left_avail1)
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{ /* First 4x4 block*/
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val_u_l1 += *pu1_left;
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val_v_l1 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l1 += *pu1_left;
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val_v_l1 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l1 += *pu1_left;
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val_v_l1 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l1 += *pu1_left + 2;
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val_v_l1 += *(pu1_left + 1) + 2;
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pu1_left -= 2;
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}
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else
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pu1_left -= 2 * 4;
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if(left_avail2)
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{
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/* Second 4x4 block*/
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val_u_l2 += *pu1_left;
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val_v_l2 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l2 += *pu1_left;
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val_v_l2 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l2 += *pu1_left;
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val_v_l2 += *(pu1_left + 1);
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pu1_left -= 2;
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val_u_l2 += *pu1_left + 2;
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val_v_l2 += *(pu1_left + 1) + 2;
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pu1_left -= 2;
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}
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else
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pu1_left -= 2 * 4;
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if(top_avail)
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{
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val_u_t1 += *pu1_top + *(pu1_top + 2) + *(pu1_top + 4)
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+ *(pu1_top + 6) + 2;
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val_u_t2 += *(pu1_top + 8) + *(pu1_top + 10) + *(pu1_top + 12)
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+ *(pu1_top + 14) + 2;
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val_v_t1 += *(pu1_top + 1) + *(pu1_top + 3) + *(pu1_top + 5)
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+ *(pu1_top + 7) + 2;
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val_v_t2 += *(pu1_top + 9) + *(pu1_top + 11) + *(pu1_top + 13)
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+ *(pu1_top + 15) + 2;
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}
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if(left_avail + top_avail)
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{
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val_u1 = (left_avail1 + top_avail) ?
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((val_u_l1 + val_u_t1)
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>> (1 + left_avail1 + top_avail)) :128;
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val_v1 = (left_avail1 + top_avail) ?
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((val_v_l1 + val_v_t1)
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>> (1 + left_avail1 + top_avail)) :128;
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if(top_avail)
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{
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val_u2 = val_u_t2 >> 2;
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val_v2 = val_v_t2 >> 2;
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}
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else if(left_avail1)
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{
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val_u2 = val_u_l1 >> 2;
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val_v2 = val_v_l1 >> 2;
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}
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else
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{
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val_u2 = val_v2 = 128;
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}
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for(row = 0; row < 4; row++)
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{
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/*top left 4x4 block*/
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for(col = 0; col < 8; col += 2)
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{
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*(pu1_dst + row * dst_strd + col) = val_u1;
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*(pu1_dst + row * dst_strd + col + 1) = val_v1;
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}
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/*top right 4x4 block*/
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for(col = 8; col < 16; col += 2)
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{
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*(pu1_dst + row * dst_strd + col) = val_u2;
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*(pu1_dst + row * dst_strd + col + 1) = val_v2;
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}
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}
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if(left_avail2)
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{
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val_u1 = val_u_l2 >> 2;
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val_v1 = val_v_l2 >> 2;
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}
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else if(top_avail)
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{
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val_u1 = val_u_t1 >> 2;
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val_v1 = val_v_t1 >> 2;
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}
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else
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{
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val_u1 = val_v1 = 128;
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}
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val_u2 = (left_avail2 + top_avail) ?
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((val_u_l2 + val_u_t2)
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>> (1 + left_avail2 + top_avail)) : 128;
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val_v2 = (left_avail2 + top_avail) ?
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((val_v_l2 + val_v_t2)
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>> (1 + left_avail2 + top_avail)) : 128;
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for(row = 4; row < 8; row++)
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{ /*bottom left 4x4 block*/
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for(col = 0; col < 8; col += 2)
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{
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*(pu1_dst + row * dst_strd + col) = val_u1;
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*(pu1_dst + row * dst_strd + col + 1) = val_v1;
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}
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/*bottom right 4x4 block*/
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for(col = 8; col < 16; col += 2)
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{
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*(pu1_dst + row * dst_strd + col) = val_u2;
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*(pu1_dst + row * dst_strd + col + 1) = val_v2;
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}
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}
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}
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else
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{
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/* Both left and top are unavailable, set the block to 128 */
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for(row = 0; row < 8; row++)
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{
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memset(pu1_dst + row * dst_strd, 128, 8 * sizeof(UWORD16));
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}
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}
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}
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/**
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*******************************************************************************
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*
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*ih264_intra_pred_chroma_8x8_mode_horz
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*
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* @brief
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* Perform Intra prediction for chroma_8x8 mode:Horizontal
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*
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* @par Description:
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* Perform Intra prediction for chroma_8x8 mode:Horizontal ,described in sec 8.3.4.2
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*
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* @param[in] pu1_src
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* UWORD8 pointer to the source containing alternate U and V samples
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*
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* @param[out] pu1_dst
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* UWORD8 pointer to the destination with alternate U and V samples
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*
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* @param[in] src_strd
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* integer source stride
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*
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* @param[in] dst_strd
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* integer destination stride
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*
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* @param[in] ngbr_avail
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* availability of neighbouring pixels(Not used in this function)
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*
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* @returns
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*
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* @remarks
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* None
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*
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******************************************************************************
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*/
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void ih264_intra_pred_chroma_8x8_mode_horz(UWORD8 *pu1_src,
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UWORD8 *pu1_dst,
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WORD32 src_strd,
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WORD32 dst_strd,
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WORD32 ngbr_avail)
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{
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UWORD8 *pu1_left = NULL; /* Pointer to start of top predictors */
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WORD32 rows, cols; /* loop variables*/
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UNUSED(src_strd);
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UNUSED(ngbr_avail);
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pu1_left = pu1_src + 2 * BLK8x8SIZE - 2;
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for(rows = 0; rows < 8; rows++)
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{
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for(cols = 0; cols < 16; cols += 2)
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{
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*(pu1_dst + rows * dst_strd + cols) = *pu1_left;
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*(pu1_dst + rows * dst_strd + cols + 1) = *(pu1_left + 1);
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}
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pu1_left -= 2;
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}
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}
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/**
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*******************************************************************************
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*
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*ih264_intra_pred_chroma_8x8_mode_vert
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*
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* @brief
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* Perform Intra prediction for chroma_8x8 mode:vertical
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*
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* @par Description:
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* Perform Intra prediction for chroma_8x8 mode:vertical ,described in sec 8.3.4.3
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*
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* @param[in] pu1_src
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* UWORD8 pointer to the source containing alternate U and V samples
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*
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* @param[out] pu1_dst
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* UWORD8 pointer to the destination with alternate U and V samples
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*
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* @param[in] src_strd
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* integer source stride
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*
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* @param[in] dst_strd
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* integer destination stride
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*
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* @param[in] ngbr_avail
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* availability of neighbouring pixels(Not used in this function)
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*
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* @returns
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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void ih264_intra_pred_chroma_8x8_mode_vert(UWORD8 *pu1_src,
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UWORD8 *pu1_dst,
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WORD32 src_strd,
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WORD32 dst_strd,
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WORD32 ngbr_avail)
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{
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UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */
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WORD32 row;/*loop variable*/
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UNUSED(src_strd);
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UNUSED(ngbr_avail);
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pu1_top = pu1_src + 2 * BLK8x8SIZE + 2;
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/* 8 bytes are copied from src to dst */
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for(row = 0; row < 2; row++)
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{
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memcpy(pu1_dst, pu1_top, 16);
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pu1_dst += dst_strd;
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memcpy(pu1_dst, pu1_top, 16);
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pu1_dst += dst_strd;
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memcpy(pu1_dst, pu1_top, 16);
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pu1_dst += dst_strd;
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memcpy(pu1_dst, pu1_top, 16);
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pu1_dst += dst_strd;
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}
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}
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/**
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*******************************************************************************
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*
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* ih264_intra_pred_chroma_8x8_mode_plane
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*
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* @brief
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* Perform Intra prediction for chroma_8x8 mode:PLANE
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*
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* @par Description:
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* Perform Intra prediction for chroma_8x8 mode:PLANE ,described in sec 8.3.4.4
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*
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* @param[in] pu1_src
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* UWORD8 pointer to the source containing alternate U and V samples
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*
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* @param[out] pu1_dst
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* UWORD8 pointer to the destination with alternate U and V samples
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*
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* @param[in] src_strd
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* integer source stride
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*
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* @param[in] dst_strd
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* integer destination stride
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*
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* @param[in] ngbr_avail
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* availability of neighbouring pixels(Not used in this function)
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*
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* @returns
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*
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* @remarks
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* None
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*
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******************************************************************************
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*/
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void ih264_intra_pred_chroma_8x8_mode_plane(UWORD8 *pu1_src,
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UWORD8 *pu1_dst,
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WORD32 src_strd,
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WORD32 dst_strd,
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WORD32 ngbr_avail)
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{
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UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */
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UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */
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WORD32 val = 0;
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WORD32 rows, cols; /* loop variables*/
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WORD32 a_u, b_u, c_u, h_u, v_u; /* Implementing section 8.3.4.4 . The variables represent the corresponding variables in the section*/
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WORD32 a_v, b_v, c_v, h_v, v_v;
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UNUSED(src_strd);
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UNUSED(ngbr_avail);
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a_u = b_u = c_u = h_u = v_u = 0;
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a_v = b_v = c_v = h_v = v_v = 0;
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/* As chroma format 4:2:0 is used,xCF = 4 * ( chroma_format_idc = = 3 ) = 0 and
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yCF = 4 * ( chroma_format_idc != 1 ) = 0 */
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pu1_top = pu1_src + 2 * BLK8x8SIZE + 2;
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pu1_left = pu1_src + 2 * BLK8x8SIZE - 2;
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/* Implementing section 8.3.4.4 */
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for(cols = 0; cols < 4; cols++)
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{
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h_u += (cols + 1) * (pu1_top[8 + 2 * cols] - pu1_top[4 - 2 * cols]);/*section 8.3.4.4 equation (8-144)*/
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h_v += (cols + 1) * (pu1_top[8 + 2 * cols + 1] - pu1_top[4 - 2 * cols+ 1]);
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v_u += (cols + 1) * (pu1_left[(4 + cols) * (-2)] - pu1_left[(2 - cols) * (-2)]);
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v_v += (cols + 1) * (pu1_left[(4 + cols) * (-2) + 1] - pu1_left[(2 - cols) * (-2) + 1]);/*section 8.3.4.4 equation (8-145)*/
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}
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a_u = 16 * (pu1_left[7 * (-2)] + pu1_top[14]);
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a_v = 16 * (pu1_left[7 * (-2) + 1] + pu1_top[15]);/*section 8.3.3.4 equation (8-141)*/
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b_u = (34 * h_u + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/
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b_v = (34 * h_v + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/
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c_u = (34 * v_u + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/
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c_v = (34 * v_v + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/
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for(rows = 0; rows < 8; rows++)
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{
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for(cols = 0; cols < 8; cols++)
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{
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val = (a_u + b_u * (cols - 3) + c_u * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/
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val = (val + 16) >> 5;
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*(pu1_dst + rows * dst_strd + 2 * cols) = CLIP_U8(val);
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val = (a_v + b_v * (cols - 3) + c_v * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/
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val = (val + 16) >> 5;
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*(pu1_dst + rows * dst_strd + 2 * cols + 1) = CLIP_U8(val);
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}
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}
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}
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