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