1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AV1_COMMON_FILTER_H_ 13 #define AOM_AV1_COMMON_FILTER_H_ 14 15 #include <assert.h> 16 17 #include "config/aom_config.h" 18 19 #include "aom/aom_integer.h" 20 #include "aom_dsp/aom_filter.h" 21 #include "aom_ports/mem.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 #define MAX_FILTER_TAP 8 28 29 typedef enum ATTRIBUTE_PACKED { 30 EIGHTTAP_REGULAR, 31 EIGHTTAP_SMOOTH, 32 MULTITAP_SHARP, 33 BILINEAR, 34 INTERP_FILTERS_ALL, 35 SWITCHABLE_FILTERS = BILINEAR, 36 SWITCHABLE = SWITCHABLE_FILTERS + 1, /* the last switchable one */ 37 EXTRA_FILTERS = INTERP_FILTERS_ALL - SWITCHABLE_FILTERS, 38 } InterpFilter; 39 40 enum { 41 USE_2_TAPS_ORIG = 0, // This is used in temporal filtering. 42 USE_2_TAPS, 43 USE_4_TAPS, 44 USE_8_TAPS, 45 } UENUM1BYTE(SUBPEL_SEARCH_TYPE); 46 47 // Pack two InterpFilter's into a uint32_t: since there are at most 10 filters, 48 // we can use 16 bits for each and have more than enough space. This reduces 49 // argument passing and unifies the operation of setting a (pair of) filters. 50 typedef uint32_t InterpFilters; 51 static INLINE InterpFilter av1_extract_interp_filter(InterpFilters filters, 52 int x_filter) { 53 return (InterpFilter)((filters >> (x_filter ? 16 : 0)) & 0xf); 54 } 55 56 static INLINE InterpFilters av1_make_interp_filters(InterpFilter y_filter, 57 InterpFilter x_filter) { 58 uint16_t y16 = y_filter & 0xf; 59 uint16_t x16 = x_filter & 0xf; 60 return y16 | ((uint32_t)x16 << 16); 61 } 62 63 static INLINE InterpFilters av1_broadcast_interp_filter(InterpFilter filter) { 64 return av1_make_interp_filters(filter, filter); 65 } 66 67 static INLINE InterpFilter av1_unswitchable_filter(InterpFilter filter) { 68 return filter == SWITCHABLE ? EIGHTTAP_REGULAR : filter; 69 } 70 71 /* (1 << LOG_SWITCHABLE_FILTERS) > SWITCHABLE_FILTERS */ 72 #define LOG_SWITCHABLE_FILTERS 2 73 74 #define MAX_SUBPEL_TAPS 12 75 #define SWITCHABLE_FILTER_CONTEXTS ((SWITCHABLE_FILTERS + 1) * 4) 76 #define INTER_FILTER_COMP_OFFSET (SWITCHABLE_FILTERS + 1) 77 #define INTER_FILTER_DIR_OFFSET ((SWITCHABLE_FILTERS + 1) * 2) 78 79 typedef struct InterpFilterParams { 80 const int16_t *filter_ptr; 81 uint16_t taps; 82 uint16_t subpel_shifts; 83 InterpFilter interp_filter; 84 } InterpFilterParams; 85 86 DECLARE_ALIGNED(256, static const InterpKernel, 87 av1_bilinear_filters[SUBPEL_SHIFTS]) = { 88 { 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, 0, 120, 8, 0, 0, 0 }, 89 { 0, 0, 0, 112, 16, 0, 0, 0 }, { 0, 0, 0, 104, 24, 0, 0, 0 }, 90 { 0, 0, 0, 96, 32, 0, 0, 0 }, { 0, 0, 0, 88, 40, 0, 0, 0 }, 91 { 0, 0, 0, 80, 48, 0, 0, 0 }, { 0, 0, 0, 72, 56, 0, 0, 0 }, 92 { 0, 0, 0, 64, 64, 0, 0, 0 }, { 0, 0, 0, 56, 72, 0, 0, 0 }, 93 { 0, 0, 0, 48, 80, 0, 0, 0 }, { 0, 0, 0, 40, 88, 0, 0, 0 }, 94 { 0, 0, 0, 32, 96, 0, 0, 0 }, { 0, 0, 0, 24, 104, 0, 0, 0 }, 95 { 0, 0, 0, 16, 112, 0, 0, 0 }, { 0, 0, 0, 8, 120, 0, 0, 0 } 96 }; 97 98 DECLARE_ALIGNED(256, static const InterpKernel, 99 av1_sub_pel_filters_8[SUBPEL_SHIFTS]) = { 100 { 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 2, -6, 126, 8, -2, 0, 0 }, 101 { 0, 2, -10, 122, 18, -4, 0, 0 }, { 0, 2, -12, 116, 28, -8, 2, 0 }, 102 { 0, 2, -14, 110, 38, -10, 2, 0 }, { 0, 2, -14, 102, 48, -12, 2, 0 }, 103 { 0, 2, -16, 94, 58, -12, 2, 0 }, { 0, 2, -14, 84, 66, -12, 2, 0 }, 104 { 0, 2, -14, 76, 76, -14, 2, 0 }, { 0, 2, -12, 66, 84, -14, 2, 0 }, 105 { 0, 2, -12, 58, 94, -16, 2, 0 }, { 0, 2, -12, 48, 102, -14, 2, 0 }, 106 { 0, 2, -10, 38, 110, -14, 2, 0 }, { 0, 2, -8, 28, 116, -12, 2, 0 }, 107 { 0, 0, -4, 18, 122, -10, 2, 0 }, { 0, 0, -2, 8, 126, -6, 2, 0 } 108 }; 109 110 DECLARE_ALIGNED(256, static const InterpKernel, 111 av1_sub_pel_filters_8sharp[SUBPEL_SHIFTS]) = { 112 { 0, 0, 0, 128, 0, 0, 0, 0 }, { -2, 2, -6, 126, 8, -2, 2, 0 }, 113 { -2, 6, -12, 124, 16, -6, 4, -2 }, { -2, 8, -18, 120, 26, -10, 6, -2 }, 114 { -4, 10, -22, 116, 38, -14, 6, -2 }, { -4, 10, -22, 108, 48, -18, 8, -2 }, 115 { -4, 10, -24, 100, 60, -20, 8, -2 }, { -4, 10, -24, 90, 70, -22, 10, -2 }, 116 { -4, 12, -24, 80, 80, -24, 12, -4 }, { -2, 10, -22, 70, 90, -24, 10, -4 }, 117 { -2, 8, -20, 60, 100, -24, 10, -4 }, { -2, 8, -18, 48, 108, -22, 10, -4 }, 118 { -2, 6, -14, 38, 116, -22, 10, -4 }, { -2, 6, -10, 26, 120, -18, 8, -2 }, 119 { -2, 4, -6, 16, 124, -12, 6, -2 }, { 0, 2, -2, 8, 126, -6, 2, -2 } 120 }; 121 122 DECLARE_ALIGNED(256, static const InterpKernel, 123 av1_sub_pel_filters_8smooth[SUBPEL_SHIFTS]) = { 124 { 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 2, 28, 62, 34, 2, 0, 0 }, 125 { 0, 0, 26, 62, 36, 4, 0, 0 }, { 0, 0, 22, 62, 40, 4, 0, 0 }, 126 { 0, 0, 20, 60, 42, 6, 0, 0 }, { 0, 0, 18, 58, 44, 8, 0, 0 }, 127 { 0, 0, 16, 56, 46, 10, 0, 0 }, { 0, -2, 16, 54, 48, 12, 0, 0 }, 128 { 0, -2, 14, 52, 52, 14, -2, 0 }, { 0, 0, 12, 48, 54, 16, -2, 0 }, 129 { 0, 0, 10, 46, 56, 16, 0, 0 }, { 0, 0, 8, 44, 58, 18, 0, 0 }, 130 { 0, 0, 6, 42, 60, 20, 0, 0 }, { 0, 0, 4, 40, 62, 22, 0, 0 }, 131 { 0, 0, 4, 36, 62, 26, 0, 0 }, { 0, 0, 2, 34, 62, 28, 2, 0 } 132 }; 133 134 static const InterpFilterParams 135 av1_interp_filter_params_list[SWITCHABLE_FILTERS + 1] = { 136 { (const int16_t *)av1_sub_pel_filters_8, SUBPEL_TAPS, SUBPEL_SHIFTS, 137 EIGHTTAP_REGULAR }, 138 { (const int16_t *)av1_sub_pel_filters_8smooth, SUBPEL_TAPS, 139 SUBPEL_SHIFTS, EIGHTTAP_SMOOTH }, 140 { (const int16_t *)av1_sub_pel_filters_8sharp, SUBPEL_TAPS, SUBPEL_SHIFTS, 141 MULTITAP_SHARP }, 142 { (const int16_t *)av1_bilinear_filters, SUBPEL_TAPS, SUBPEL_SHIFTS, 143 BILINEAR } 144 }; 145 146 // A special 2-tap bilinear filter for IntraBC chroma. IntraBC uses full pixel 147 // MV for luma. If sub-sampling exists, chroma may possibly use half-pel MV. 148 DECLARE_ALIGNED(256, static const int16_t, av1_intrabc_bilinear_filter[2]) = { 149 64, 150 64, 151 }; 152 153 static const InterpFilterParams av1_intrabc_filter_params = { 154 av1_intrabc_bilinear_filter, 2, 0, BILINEAR 155 }; 156 157 DECLARE_ALIGNED(256, static const InterpKernel, 158 av1_sub_pel_filters_4[SUBPEL_SHIFTS]) = { 159 { 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, -4, 126, 8, -2, 0, 0 }, 160 { 0, 0, -8, 122, 18, -4, 0, 0 }, { 0, 0, -10, 116, 28, -6, 0, 0 }, 161 { 0, 0, -12, 110, 38, -8, 0, 0 }, { 0, 0, -12, 102, 48, -10, 0, 0 }, 162 { 0, 0, -14, 94, 58, -10, 0, 0 }, { 0, 0, -12, 84, 66, -10, 0, 0 }, 163 { 0, 0, -12, 76, 76, -12, 0, 0 }, { 0, 0, -10, 66, 84, -12, 0, 0 }, 164 { 0, 0, -10, 58, 94, -14, 0, 0 }, { 0, 0, -10, 48, 102, -12, 0, 0 }, 165 { 0, 0, -8, 38, 110, -12, 0, 0 }, { 0, 0, -6, 28, 116, -10, 0, 0 }, 166 { 0, 0, -4, 18, 122, -8, 0, 0 }, { 0, 0, -2, 8, 126, -4, 0, 0 } 167 }; 168 DECLARE_ALIGNED(256, static const InterpKernel, 169 av1_sub_pel_filters_4smooth[SUBPEL_SHIFTS]) = { 170 { 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, 30, 62, 34, 2, 0, 0 }, 171 { 0, 0, 26, 62, 36, 4, 0, 0 }, { 0, 0, 22, 62, 40, 4, 0, 0 }, 172 { 0, 0, 20, 60, 42, 6, 0, 0 }, { 0, 0, 18, 58, 44, 8, 0, 0 }, 173 { 0, 0, 16, 56, 46, 10, 0, 0 }, { 0, 0, 14, 54, 48, 12, 0, 0 }, 174 { 0, 0, 12, 52, 52, 12, 0, 0 }, { 0, 0, 12, 48, 54, 14, 0, 0 }, 175 { 0, 0, 10, 46, 56, 16, 0, 0 }, { 0, 0, 8, 44, 58, 18, 0, 0 }, 176 { 0, 0, 6, 42, 60, 20, 0, 0 }, { 0, 0, 4, 40, 62, 22, 0, 0 }, 177 { 0, 0, 4, 36, 62, 26, 0, 0 }, { 0, 0, 2, 34, 62, 30, 0, 0 } 178 }; 179 180 // For w<=4, MULTITAP_SHARP is the same as EIGHTTAP_REGULAR 181 static const InterpFilterParams av1_interp_4tap[SWITCHABLE_FILTERS + 1] = { 182 { (const int16_t *)av1_sub_pel_filters_4, SUBPEL_TAPS, SUBPEL_SHIFTS, 183 EIGHTTAP_REGULAR }, 184 { (const int16_t *)av1_sub_pel_filters_4smooth, SUBPEL_TAPS, SUBPEL_SHIFTS, 185 EIGHTTAP_SMOOTH }, 186 { (const int16_t *)av1_sub_pel_filters_4, SUBPEL_TAPS, SUBPEL_SHIFTS, 187 EIGHTTAP_REGULAR }, 188 { (const int16_t *)av1_bilinear_filters, SUBPEL_TAPS, SUBPEL_SHIFTS, 189 BILINEAR }, 190 }; 191 192 static INLINE const InterpFilterParams * 193 av1_get_interp_filter_params_with_block_size(const InterpFilter interp_filter, 194 const int w) { 195 if (w <= 4) return &av1_interp_4tap[interp_filter]; 196 return &av1_interp_filter_params_list[interp_filter]; 197 } 198 199 static INLINE const InterpFilterParams *get_4tap_interp_filter_params( 200 const InterpFilter interp_filter) { 201 return &av1_interp_4tap[interp_filter]; 202 } 203 204 static INLINE const int16_t *av1_get_interp_filter_kernel( 205 const InterpFilter interp_filter, int subpel_search) { 206 assert(subpel_search >= USE_2_TAPS); 207 return (subpel_search == USE_2_TAPS) 208 ? av1_interp_4tap[BILINEAR].filter_ptr 209 : ((subpel_search == USE_4_TAPS) 210 ? av1_interp_4tap[interp_filter].filter_ptr 211 : av1_interp_filter_params_list[interp_filter].filter_ptr); 212 } 213 214 static INLINE const int16_t *av1_get_interp_filter_subpel_kernel( 215 const InterpFilterParams *const filter_params, const int subpel) { 216 return filter_params->filter_ptr + filter_params->taps * subpel; 217 } 218 219 static INLINE const InterpFilterParams *av1_get_filter(int subpel_search) { 220 assert(subpel_search >= USE_2_TAPS); 221 222 switch (subpel_search) { 223 case USE_2_TAPS: return get_4tap_interp_filter_params(BILINEAR); 224 case USE_4_TAPS: return get_4tap_interp_filter_params(EIGHTTAP_REGULAR); 225 case USE_8_TAPS: return &av1_interp_filter_params_list[EIGHTTAP_REGULAR]; 226 default: assert(0); return NULL; 227 } 228 } 229 230 #ifdef __cplusplus 231 } // extern "C" 232 #endif 233 234 #endif // AOM_AV1_COMMON_FILTER_H_ 235
