Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame^] | 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 | ******************************************************************************* |
| 23 | * @file |
| 24 | * ih264e_half_pel.c |
| 25 | * |
| 26 | * @brief |
| 27 | * This file contains functions that are used for computing subpixel planes |
| 28 | * |
| 29 | * @author |
| 30 | * ittiam |
| 31 | * |
| 32 | * @par List of Functions: |
| 33 | * - ih264e_sixtapfilter_horz |
| 34 | * - ih264e_sixtap_filter_2dvh_vert |
| 35 | * |
| 36 | * @remarks |
| 37 | * None |
| 38 | * |
| 39 | ******************************************************************************* |
| 40 | */ |
| 41 | |
| 42 | /*****************************************************************************/ |
| 43 | /* File Includes */ |
| 44 | /*****************************************************************************/ |
| 45 | |
| 46 | /* System include files */ |
| 47 | #include <stdio.h> |
| 48 | #include <assert.h> |
| 49 | #include <limits.h> |
| 50 | |
| 51 | /* User include files */ |
| 52 | #include "ih264_typedefs.h" |
| 53 | #include "ithread.h" |
| 54 | #include "ih264_platform_macros.h" |
| 55 | #include "ih264_defs.h" |
| 56 | #include "ih264e_half_pel.h" |
| 57 | #include "ih264_macros.h" |
| 58 | #include "ih264e_half_pel.h" |
| 59 | #include "ih264e_debug.h" |
| 60 | #include "ih264_inter_pred_filters.h" |
| 61 | #include "ih264_mem_fns.h" |
| 62 | #include "ih264_padding.h" |
| 63 | #include "ih264_intra_pred_filters.h" |
| 64 | #include "ih264_deblk_edge_filters.h" |
| 65 | |
| 66 | |
| 67 | /*****************************************************************************/ |
| 68 | /* Function Definitions */ |
| 69 | /*****************************************************************************/ |
| 70 | |
| 71 | /** |
| 72 | ******************************************************************************* |
| 73 | * |
| 74 | * @brief |
| 75 | * Interprediction luma filter for horizontal input (Filter run for width = 17 |
| 76 | * and height =16) |
| 77 | * |
| 78 | * @par Description: |
| 79 | * Applies a 6 tap horizontal filter .The output is clipped to 8 bits |
| 80 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 81 | * |
| 82 | * @param[in] pu1_src |
| 83 | * UWORD8 pointer to the source |
| 84 | * |
| 85 | * @param[out] pu1_dst |
| 86 | * UWORD8 pointer to the destination |
| 87 | * |
| 88 | * @param[in] src_strd |
| 89 | * integer source stride |
| 90 | * |
| 91 | * @param[in] dst_strd |
| 92 | * integer destination stride |
| 93 | * |
| 94 | * @returns |
| 95 | * |
| 96 | * @remarks |
| 97 | * None |
| 98 | * |
| 99 | ******************************************************************************* |
| 100 | */ |
| 101 | void ih264e_sixtapfilter_horz(UWORD8 *pu1_src, |
| 102 | UWORD8 *pu1_dst, |
| 103 | WORD32 src_strd, |
| 104 | WORD32 dst_strd) |
| 105 | { |
| 106 | UWORD32 u4_i, u4_j; |
| 107 | UWORD32 u4_w, u4_h; |
| 108 | |
| 109 | /* width and height of interpolation */ |
| 110 | u4_w = HP_PL_WD; |
| 111 | u4_h = MB_SIZE; |
| 112 | |
| 113 | pu1_src -= 2; |
| 114 | |
| 115 | for (u4_i = 0; u4_i < u4_h; u4_i++) |
| 116 | { |
| 117 | for (u4_j = 0; u4_j < u4_w; u4_j++, pu1_dst++, pu1_src++) |
| 118 | { |
| 119 | WORD16 i16_temp; |
| 120 | |
| 121 | i16_temp = ih264_g_six_tap[0] * (*pu1_src + pu1_src[5]) |
| 122 | + ih264_g_six_tap[1] * (pu1_src[1] + pu1_src[4]) |
| 123 | + ih264_g_six_tap[2] * (pu1_src[2] + pu1_src[3]); |
| 124 | |
| 125 | i16_temp = (i16_temp + 16) >> 5; |
| 126 | |
| 127 | *pu1_dst = CLIP_U8(i16_temp); |
| 128 | } |
| 129 | pu1_src += src_strd - u4_w; |
| 130 | pu1_dst += dst_strd - u4_w; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | ******************************************************************************* |
| 136 | * |
| 137 | * @brief |
| 138 | * This function implements a two stage cascaded six tap filter. It applies |
| 139 | * the six tap filter in the vertical direction on the predictor values, |
| 140 | * followed by applying the same filter in the horizontal direction on the |
| 141 | * output of the first stage. The six tap filtering operation is described in |
| 142 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" (Filter run for |
| 143 | * width = 17 and height = 17) |
| 144 | * |
| 145 | * @par Description: |
| 146 | * The function interpolates the predictors first in the vertical direction and |
| 147 | * then in the horizontal direction to output the (1/2,1/2). The output of the |
| 148 | * first stage of the filter is stored in the buffer pointed to by |
| 149 | * pi16_pred1(only in C) in 16 bit precision. |
| 150 | * |
| 151 | * @param[in] pu1_src |
| 152 | * UWORD8 pointer to the source |
| 153 | * |
| 154 | * @param[out] pu1_dst1 |
| 155 | * UWORD8 pointer to the destination (Horizontal filtered output) |
| 156 | * |
| 157 | * @param[out] pu1_dst2 |
| 158 | * UWORD8 pointer to the destination (output after applying vertical filter to |
| 159 | * the intermediate horizontal output) |
| 160 | * |
| 161 | * @param[in] src_strd |
| 162 | * integer source stride |
| 163 | |
| 164 | * @param[in] dst_strd |
| 165 | * integer destination stride of pu1_dst |
| 166 | * |
| 167 | * @param[in] pi4_pred |
| 168 | * Pointer to 16bit intermediate buffer (used only in c) |
| 169 | * |
| 170 | * @param[in] i4_pred_strd |
| 171 | * integer destination stride of pi16_pred1 |
| 172 | * |
| 173 | * @returns |
| 174 | * |
| 175 | * @remarks |
| 176 | * None |
| 177 | * |
| 178 | ******************************************************************************* |
| 179 | */ |
| 180 | void ih264e_sixtap_filter_2dvh_vert(UWORD8 *pu1_src, |
| 181 | UWORD8 *pu1_dst1, |
| 182 | UWORD8 *pu1_dst2, |
| 183 | WORD32 src_strd, |
| 184 | WORD32 dst_strd, |
| 185 | WORD32 *pi4_pred, |
| 186 | WORD32 i4_pred_strd) |
| 187 | { |
| 188 | WORD32 row, col; |
| 189 | WORD32 tmp; |
| 190 | WORD32 *pi4_pred_temp = pi4_pred; |
| 191 | WORD32 ht = HP_PL_HT, wd = HP_PL_WD; |
| 192 | |
| 193 | for (row = 0; row < ht; row++) |
| 194 | { |
| 195 | for (col = -2; col < wd + 3; col++) |
| 196 | { |
| 197 | tmp = ih264_g_six_tap[0] * (pu1_src[col - 2 * src_strd] + pu1_src[col + 3 * src_strd]) + |
| 198 | ih264_g_six_tap[1] * (pu1_src[col - 1 * src_strd] + pu1_src[col + 2 * src_strd]) + |
| 199 | ih264_g_six_tap[2] * (pu1_src[col] + pu1_src[col + 1 * src_strd]); |
| 200 | |
| 201 | pi4_pred_temp[col] = tmp; |
| 202 | } |
| 203 | |
| 204 | pu1_src += src_strd; |
| 205 | pi4_pred_temp += i4_pred_strd; |
| 206 | } |
| 207 | |
| 208 | for (row = 0; row < ht; row++) |
| 209 | { |
| 210 | for (col = 0; col < wd; col++) |
| 211 | { |
| 212 | tmp = (pi4_pred[col - 2] + pi4_pred[col + 3]) + |
| 213 | ih264_g_six_tap[1] * (pi4_pred[col - 1] + pi4_pred[col + 2]) + |
| 214 | ih264_g_six_tap[2] * (pi4_pred[col] + pi4_pred[col + 1]); |
| 215 | |
| 216 | tmp = (tmp + 512) >> 10; |
| 217 | |
| 218 | pu1_dst2[col] = CLIP_U8(tmp); |
| 219 | pu1_dst1[col] = CLIP_U8((pi4_pred[col] + 16) >> 5); |
| 220 | } |
| 221 | pi4_pred += i4_pred_strd; |
| 222 | pu1_dst2 += dst_strd; |
| 223 | pu1_dst1 += dst_strd; |
| 224 | } |
| 225 | } |
| 226 | |