1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 /** 21 ******************************************************************************* 22 * @file 23 * ih264_ihadamard_scaling.c 24 * 25 * @brief 26 * Contains definition of functions for h264 inverse hadamard 4x4 transform and scaling 27 * 28 * @author 29 * Mohit 30 * 31 * @par List of Functions: 32 * - ih264_ihadamard_scaling_4x4() 33 * 34 * @remarks 35 * 36 ******************************************************************************* 37 */ 38 39 /*****************************************************************************/ 40 /* File Includes */ 41 /*****************************************************************************/ 42 43 /* User include files */ 44 #include "ih264_typedefs.h" 45 #include "ih264_defs.h" 46 #include "ih264_trans_macros.h" 47 #include "ih264_macros.h" 48 #include "ih264_trans_data.h" 49 #include "ih264_size_defs.h" 50 #include "ih264_structs.h" 51 #include "ih264_trans_quant_itrans_iquant.h" 52 53 /* 54 ******************************************************************************** 55 * 56 * @brief This function performs a 4x4 inverse hadamard transform on the 4x4 DC coefficients 57 * of a 16x16 intra prediction macroblock, and then performs scaling. 58 * prediction buffer 59 * 60 * @par Description: 61 * The DC coefficients pass through a 2-stage inverse hadamard transform. 62 * This inverse transformed content is scaled to based on Qp value. 63 * 64 * @param[in] pi2_src 65 * input 4x4 block of DC coefficients 66 * 67 * @param[out] pi2_out 68 * output 4x4 block 69 * 70 * @param[in] pu2_iscal_mat 71 * pointer to scaling list 72 * 73 * @param[in] pu2_weigh_mat 74 * pointer to weight matrix 75 * 76 * @param[in] u4_qp_div_6 77 * Floor (qp/6) 78 * 79 * @param[in] pi4_tmp 80 * temporary buffer of size 1*16 81 * 82 * @returns none 83 * 84 * @remarks none 85 * 86 ******************************************************************************* 87 */ 88 void ih264_ihadamard_scaling_4x4(WORD16* pi2_src, 89 WORD16* pi2_out, 90 const UWORD16 *pu2_iscal_mat, 91 const UWORD16 *pu2_weigh_mat, 92 UWORD32 u4_qp_div_6, 93 WORD32* pi4_tmp) 94 { 95 WORD32 i; 96 WORD32 x0, x1, x2, x3, x4, x5, x6, x7; 97 WORD16* pi2_src_ptr, *pi2_out_ptr; 98 WORD32* pi4_tmp_ptr; 99 WORD32 rnd_fact = (u4_qp_div_6 < 6) ? (1 << (5 - u4_qp_div_6)) : 0; 100 pi4_tmp_ptr = pi4_tmp; 101 pi2_src_ptr = pi2_src; 102 pi2_out_ptr = pi2_out; 103 // Horizontal transform 104 for(i = 0; i < SUB_BLK_WIDTH_4x4; i++) 105 { 106 x4 = pi2_src_ptr[0]; 107 x5 = pi2_src_ptr[1]; 108 x6 = pi2_src_ptr[2]; 109 x7 = pi2_src_ptr[3]; 110 111 x0 = x4 + x7; 112 x1 = x5 + x6; 113 x2 = x5 - x6; 114 x3 = x4 - x7; 115 116 pi4_tmp_ptr[0] = x0 + x1; 117 pi4_tmp_ptr[1] = x2 + x3; 118 pi4_tmp_ptr[2] = x0 - x1; 119 pi4_tmp_ptr[3] = x3 - x2; 120 121 pi4_tmp_ptr += SUB_BLK_WIDTH_4x4; 122 pi2_src_ptr += SUB_BLK_WIDTH_4x4; 123 } 124 pi4_tmp_ptr = pi4_tmp; 125 // Vertical Transform 126 for(i = 0; i < SUB_BLK_WIDTH_4x4; i++) 127 { 128 x4 = pi4_tmp_ptr[0]; 129 x5 = pi4_tmp_ptr[4]; 130 x6 = pi4_tmp_ptr[8]; 131 x7 = pi4_tmp_ptr[12]; 132 133 x0 = x4 + x7; 134 x1 = x5 + x6; 135 x2 = x5 - x6; 136 x3 = x4 - x7; 137 138 pi4_tmp_ptr[0] = x0 + x1; 139 pi4_tmp_ptr[4] = x2 + x3; 140 pi4_tmp_ptr[8] = x0 - x1; 141 pi4_tmp_ptr[12] = x3 - x2; 142 143 pi4_tmp_ptr++; 144 } 145 pi4_tmp_ptr = pi4_tmp; 146 //Scaling 147 for(i = 0; i < (SUB_BLK_WIDTH_4x4 * SUB_BLK_WIDTH_4x4); i++) 148 { 149 INV_QUANT(pi4_tmp_ptr[i], pu2_iscal_mat[0], pu2_weigh_mat[0], u4_qp_div_6, 150 rnd_fact, 6); 151 pi2_out_ptr[i] = pi4_tmp_ptr[i]; 152 } 153 } 154 155 void ih264_ihadamard_scaling_2x2_uv(WORD16* pi2_src, 156 WORD16* pi2_out, 157 const UWORD16 *pu2_iscal_mat, 158 const UWORD16 *pu2_weigh_mat, 159 UWORD32 u4_qp_div_6, 160 WORD32* pi4_tmp) 161 { 162 WORD32 i4_x0,i4_x1,i4_x2,i4_x3,i4_x4,i4_x5,i4_x6,i4_x7; 163 WORD32 i4_y0,i4_y1,i4_y2,i4_y3,i4_y4,i4_y5,i4_y6,i4_y7; 164 165 UNUSED(pi4_tmp); 166 167 i4_x4 = pi2_src[0]; 168 i4_x5 = pi2_src[1]; 169 i4_x6 = pi2_src[2]; 170 i4_x7 = pi2_src[3]; 171 172 i4_x0 = i4_x4 + i4_x5; 173 i4_x1 = i4_x4 - i4_x5; 174 i4_x2 = i4_x6 + i4_x7; 175 i4_x3 = i4_x6 - i4_x7; 176 177 i4_x4 = i4_x0+i4_x2; 178 i4_x5 = i4_x1+i4_x3; 179 i4_x6 = i4_x0-i4_x2; 180 i4_x7 = i4_x1-i4_x3; 181 182 INV_QUANT(i4_x4,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 183 INV_QUANT(i4_x5,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 184 INV_QUANT(i4_x6,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 185 INV_QUANT(i4_x7,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 186 187 pi2_out[0] = i4_x4; 188 pi2_out[1] = i4_x5; 189 pi2_out[2] = i4_x6; 190 pi2_out[3] = i4_x7; 191 192 i4_y4 = pi2_src[4]; 193 i4_y5 = pi2_src[5]; 194 i4_y6 = pi2_src[6]; 195 i4_y7 = pi2_src[7]; 196 197 i4_y0 = i4_y4 + i4_y5; 198 i4_y1 = i4_y4 - i4_y5; 199 i4_y2 = i4_y6 + i4_y7; 200 i4_y3 = i4_y6 - i4_y7; 201 202 i4_y4 = i4_y0+i4_y2; 203 i4_y5 = i4_y1+i4_y3; 204 i4_y6 = i4_y0-i4_y2; 205 i4_y7 = i4_y1-i4_y3; 206 207 INV_QUANT(i4_y4,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 208 INV_QUANT(i4_y5,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 209 INV_QUANT(i4_y6,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 210 INV_QUANT(i4_y7,pu2_iscal_mat[0],pu2_weigh_mat[0],u4_qp_div_6,0,5); 211 212 pi2_out[4] = i4_y4; 213 pi2_out[5] = i4_y5; 214 pi2_out[6] = i4_y6; 215 pi2_out[7] = i4_y7; 216 } 217
