1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VP9_COMMON_VP9_ENTROPY_H_ 12 #define VP9_COMMON_VP9_ENTROPY_H_ 13 14 #include "vpx/vpx_integer.h" 15 #include "vpx_dsp/prob.h" 16 17 #include "vp9/common/vp9_common.h" 18 #include "vp9/common/vp9_enums.h" 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 #define DIFF_UPDATE_PROB 252 25 26 // Coefficient token alphabet 27 #define ZERO_TOKEN 0 // 0 Extra Bits 0+0 28 #define ONE_TOKEN 1 // 1 Extra Bits 0+1 29 #define TWO_TOKEN 2 // 2 Extra Bits 0+1 30 #define THREE_TOKEN 3 // 3 Extra Bits 0+1 31 #define FOUR_TOKEN 4 // 4 Extra Bits 0+1 32 #define CATEGORY1_TOKEN 5 // 5-6 Extra Bits 1+1 33 #define CATEGORY2_TOKEN 6 // 7-10 Extra Bits 2+1 34 #define CATEGORY3_TOKEN 7 // 11-18 Extra Bits 3+1 35 #define CATEGORY4_TOKEN 8 // 19-34 Extra Bits 4+1 36 #define CATEGORY5_TOKEN 9 // 35-66 Extra Bits 5+1 37 #define CATEGORY6_TOKEN 10 // 67+ Extra Bits 14+1 38 #define EOB_TOKEN 11 // EOB Extra Bits 0+0 39 40 #define ENTROPY_TOKENS 12 41 42 #define ENTROPY_NODES 11 43 44 DECLARE_ALIGNED(16, extern const uint8_t, vp9_pt_energy_class[ENTROPY_TOKENS]); 45 46 #define CAT1_MIN_VAL 5 47 #define CAT2_MIN_VAL 7 48 #define CAT3_MIN_VAL 11 49 #define CAT4_MIN_VAL 19 50 #define CAT5_MIN_VAL 35 51 #define CAT6_MIN_VAL 67 52 53 // Extra bit probabilities. 54 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat1_prob[1]); 55 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat2_prob[2]); 56 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat3_prob[3]); 57 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat4_prob[4]); 58 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat5_prob[5]); 59 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat6_prob[14]); 60 61 #if CONFIG_VP9_HIGHBITDEPTH 62 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat1_prob_high10[1]); 63 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat2_prob_high10[2]); 64 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat3_prob_high10[3]); 65 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat4_prob_high10[4]); 66 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat5_prob_high10[5]); 67 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat6_prob_high10[16]); 68 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat1_prob_high12[1]); 69 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat2_prob_high12[2]); 70 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat3_prob_high12[3]); 71 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat4_prob_high12[4]); 72 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat5_prob_high12[5]); 73 DECLARE_ALIGNED(16, extern const uint8_t, vp9_cat6_prob_high12[18]); 74 #endif // CONFIG_VP9_HIGHBITDEPTH 75 76 #define EOB_MODEL_TOKEN 3 77 78 #define DCT_MAX_VALUE 16384 79 #if CONFIG_VP9_HIGHBITDEPTH 80 #define DCT_MAX_VALUE_HIGH10 65536 81 #define DCT_MAX_VALUE_HIGH12 262144 82 #endif // CONFIG_VP9_HIGHBITDEPTH 83 84 /* Coefficients are predicted via a 3-dimensional probability table. */ 85 86 #define REF_TYPES 2 // intra=0, inter=1 87 88 /* Middle dimension reflects the coefficient position within the transform. */ 89 #define COEF_BANDS 6 90 91 /* Inside dimension is measure of nearby complexity, that reflects the energy 92 of nearby coefficients are nonzero. For the first coefficient (DC, unless 93 block type is 0), we look at the (already encoded) blocks above and to the 94 left of the current block. The context index is then the number (0,1,or 2) 95 of these blocks having nonzero coefficients. 96 After decoding a coefficient, the measure is determined by the size of the 97 most recently decoded coefficient. 98 Note that the intuitive meaning of this measure changes as coefficients 99 are decoded, e.g., prior to the first token, a zero means that my neighbors 100 are empty while, after the first token, because of the use of end-of-block, 101 a zero means we just decoded a zero and hence guarantees that a non-zero 102 coefficient will appear later in this block. However, this shift 103 in meaning is perfectly OK because our context depends also on the 104 coefficient band (and since zigzag positions 0, 1, and 2 are in 105 distinct bands). */ 106 107 #define COEFF_CONTEXTS 6 108 #define BAND_COEFF_CONTEXTS(band) ((band) == 0 ? 3 : COEFF_CONTEXTS) 109 110 // #define ENTROPY_STATS 111 112 typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS] 113 [ENTROPY_TOKENS]; 114 typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS] 115 [ENTROPY_NODES][2]; 116 117 #define SUBEXP_PARAM 4 /* Subexponential code parameter */ 118 #define MODULUS_PARAM 13 /* Modulus parameter */ 119 120 struct VP9Common; 121 void vp9_default_coef_probs(struct VP9Common *cm); 122 void vp9_adapt_coef_probs(struct VP9Common *cm); 123 124 // This is the index in the scan order beyond which all coefficients for 125 // 8x8 transform and above are in the top band. 126 // This macro is currently unused but may be used by certain implementations 127 #define MAXBAND_INDEX 21 128 129 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_8x8plus[1024]); 130 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_4x4[16]); 131 132 static INLINE const uint8_t *get_band_translate(TX_SIZE tx_size) { 133 return tx_size == TX_4X4 ? vp9_coefband_trans_4x4 134 : vp9_coefband_trans_8x8plus; 135 } 136 137 // 128 lists of probabilities are stored for the following ONE node probs: 138 // 1, 3, 5, 7, ..., 253, 255 139 // In between probabilities are interpolated linearly 140 141 #define COEFF_PROB_MODELS 255 142 143 #define UNCONSTRAINED_NODES 3 144 145 #define PIVOT_NODE 2 // which node is pivot 146 147 #define MODEL_NODES (ENTROPY_NODES - UNCONSTRAINED_NODES) 148 extern const vpx_tree_index vp9_coef_con_tree[TREE_SIZE(ENTROPY_TOKENS)]; 149 extern const vpx_prob vp9_pareto8_full[COEFF_PROB_MODELS][MODEL_NODES]; 150 151 typedef vpx_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS] 152 [UNCONSTRAINED_NODES]; 153 154 typedef unsigned int vp9_coeff_count_model[REF_TYPES][COEF_BANDS] 155 [COEFF_CONTEXTS] 156 [UNCONSTRAINED_NODES + 1]; 157 158 void vp9_model_to_full_probs(const vpx_prob *model, vpx_prob *full); 159 160 typedef char ENTROPY_CONTEXT; 161 162 static INLINE int combine_entropy_contexts(ENTROPY_CONTEXT a, 163 ENTROPY_CONTEXT b) { 164 return (a != 0) + (b != 0); 165 } 166 167 static INLINE int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a, 168 const ENTROPY_CONTEXT *l) { 169 ENTROPY_CONTEXT above_ec = 0, left_ec = 0; 170 171 switch (tx_size) { 172 case TX_4X4: 173 above_ec = a[0] != 0; 174 left_ec = l[0] != 0; 175 break; 176 case TX_8X8: 177 above_ec = !!*(const uint16_t *)a; 178 left_ec = !!*(const uint16_t *)l; 179 break; 180 case TX_16X16: 181 above_ec = !!*(const uint32_t *)a; 182 left_ec = !!*(const uint32_t *)l; 183 break; 184 case TX_32X32: 185 above_ec = !!*(const uint64_t *)a; 186 left_ec = !!*(const uint64_t *)l; 187 break; 188 default: assert(0 && "Invalid transform size."); break; 189 } 190 191 return combine_entropy_contexts(above_ec, left_ec); 192 } 193 194 #ifdef __cplusplus 195 } // extern "C" 196 #endif 197 198 #endif // VP9_COMMON_VP9_ENTROPY_H_ 199
