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 VPX_VP9_COMMON_VP9_ENTROPY_H_
12 #define VPX_VP9_COMMON_VP9_ENTROPY_H_
13
14 #define INLINE __inline
15
16 #include <stdint.h>
17 #include "mem.h"
18 #include "vp9_enums.h"
19 #include "prob.h"
20
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24
25 #define DIFF_UPDATE_PROB 252
26
27 // Coefficient token alphabet
28 #define ZERO_TOKEN 0 // 0 Extra Bits 0+0
29 #define ONE_TOKEN 1 // 1 Extra Bits 0+1
30 #define TWO_TOKEN 2 // 2 Extra Bits 0+1
31 #define THREE_TOKEN 3 // 3 Extra Bits 0+1
32 #define FOUR_TOKEN 4 // 4 Extra Bits 0+1
33 #define CATEGORY1_TOKEN 5 // 5-6 Extra Bits 1+1
34 #define CATEGORY2_TOKEN 6 // 7-10 Extra Bits 2+1
35 #define CATEGORY3_TOKEN 7 // 11-18 Extra Bits 3+1
36 #define CATEGORY4_TOKEN 8 // 19-34 Extra Bits 4+1
37 #define CATEGORY5_TOKEN 9 // 35-66 Extra Bits 5+1
38 #define CATEGORY6_TOKEN 10 // 67+ Extra Bits 14+1
39 #define EOB_TOKEN 11 // EOB Extra Bits 0+0
40
41 #define ENTROPY_TOKENS 12
42
43 #define ENTROPY_NODES 11
44
45 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_pt_energy_class[ENTROPY_TOKENS]);
46
47 #define CAT1_MIN_VAL 5
48 #define CAT2_MIN_VAL 7
49 #define CAT3_MIN_VAL 11
50 #define CAT4_MIN_VAL 19
51 #define CAT5_MIN_VAL 35
52 #define CAT6_MIN_VAL 67
53
54 // Extra bit probabilities.
55 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat1_prob[1]);
56 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat2_prob[2]);
57 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat3_prob[3]);
58 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat4_prob[4]);
59 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat5_prob[5]);
60 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat6_prob[14]);
61
62 #if CONFIG_VP9_HIGHBITDEPTH
63 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat1_prob_high10[1]);
64 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat2_prob_high10[2]);
65 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat3_prob_high10[3]);
66 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat4_prob_high10[4]);
67 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat5_prob_high10[5]);
68 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat6_prob_high10[16]);
69 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat1_prob_high12[1]);
70 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat2_prob_high12[2]);
71 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat3_prob_high12[3]);
72 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat4_prob_high12[4]);
73 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat5_prob_high12[5]);
74 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_cat6_prob_high12[18]);
75 #endif // CONFIG_VP9_HIGHBITDEPTH
76
77 #define EOB_MODEL_TOKEN 3
78
79 #define DCT_MAX_VALUE 16384
80 #if CONFIG_VP9_HIGHBITDEPTH
81 #define DCT_MAX_VALUE_HIGH10 65536
82 #define DCT_MAX_VALUE_HIGH12 262144
83 #endif // CONFIG_VP9_HIGHBITDEPTH
84
85 /* Coefficients are predicted via a 3-dimensional probability table. */
86
87 #define REF_TYPES 2 // intra=0, inter=1
88
89 /* Middle dimension reflects the coefficient position within the transform. */
90 #define COEF_BANDS 6
91
92 /* Inside dimension is measure of nearby complexity, that reflects the energy
93 of nearby coefficients are nonzero. For the first coefficient (DC, unless
94 block type is 0), we look at the (already encoded) blocks above and to the
95 left of the current block. The context index is then the number (0,1,or 2)
96 of these blocks having nonzero coefficients.
97 After decoding a coefficient, the measure is determined by the size of the
98 most recently decoded coefficient.
99 Note that the intuitive meaning of this measure changes as coefficients
100 are decoded, e.g., prior to the first token, a zero means that my neighbors
101 are empty while, after the first token, because of the use of end-of-block,
102 a zero means we just decoded a zero and hence guarantees that a non-zero
103 coefficient will appear later in this block. However, this shift
104 in meaning is perfectly OK because our context depends also on the
105 coefficient band (and since zigzag positions 0, 1, and 2 are in
106 distinct bands). */
107
108 #define COEFF_CONTEXTS 6
109 #define BAND_COEFF_CONTEXTS(band) ((band) == 0 ? 3 : COEFF_CONTEXTS)
110
111 // #define ENTROPY_STATS
112
113 typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
114 [ENTROPY_TOKENS];
115 typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
116 [ENTROPY_NODES][2];
117
118 #define SUBEXP_PARAM 4 /* Subexponential code parameter */
119 #define MODULUS_PARAM 13 /* Modulus parameter */
120
121 struct VP9Common;
122 void eb_vp9_default_coef_probs(struct VP9Common *cm);
123 void eb_vp9_adapt_coef_probs(struct VP9Common *cm);
124
125 // This is the index in the scan order beyond which all coefficients for
126 // 8x8 transform and above are in the top band.
127 // This macro is currently unused but may be used by certain implementations
128 #define MAXBAND_INDEX 21
129
130 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_coefband_trans_8x8plus[1024]);
131 DECLARE_ALIGNED(16, extern const uint8_t, eb_vp9_coefband_trans_4x4[16]);
132
get_band_translate(TX_SIZE tx_size)133 static INLINE const uint8_t *get_band_translate(TX_SIZE tx_size) {
134 return tx_size == TX_4X4 ? eb_vp9_coefband_trans_4x4
135 : eb_vp9_coefband_trans_8x8plus;
136 }
137
138 // 128 lists of probabilities are stored for the following ONE node probs:
139 // 1, 3, 5, 7, ..., 253, 255
140 // In between probabilities are interpolated linearly
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 eb_vp9_coef_con_tree[TREE_SIZE(ENTROPY_TOKENS)];
149 extern const vpx_prob eb_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 eb_vp9_model_to_full_probs(const vpx_prob *model, vpx_prob *full);
159
160 typedef char ENTROPY_CONTEXT;
161
combine_entropy_contexts(ENTROPY_CONTEXT a,ENTROPY_CONTEXT b)162 static INLINE int combine_entropy_contexts(ENTROPY_CONTEXT a,
163 ENTROPY_CONTEXT b) {
164 return (a != 0) + (b != 0);
165 }
166
get_entropy_context(TX_SIZE tx_size,const ENTROPY_CONTEXT * a,const ENTROPY_CONTEXT * l)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 // VPX_VP9_COMMON_VP9_ENTROPY_H_
199