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 typedef struct {
79 const vpx_tree_index *tree;
80 const vpx_prob *prob;
81 int len;
82 int base_val;
83 const int16_t *cost;
84 } vp9_extra_bit;
85
86 // indexed by token value
87 extern const vp9_extra_bit vp9_extra_bits[ENTROPY_TOKENS];
88 #if CONFIG_VP9_HIGHBITDEPTH
89 extern const vp9_extra_bit vp9_extra_bits_high10[ENTROPY_TOKENS];
90 extern const vp9_extra_bit vp9_extra_bits_high12[ENTROPY_TOKENS];
91 #endif // CONFIG_VP9_HIGHBITDEPTH
92
93 #define DCT_MAX_VALUE 16384
94 #if CONFIG_VP9_HIGHBITDEPTH
95 #define DCT_MAX_VALUE_HIGH10 65536
96 #define DCT_MAX_VALUE_HIGH12 262144
97 #endif // CONFIG_VP9_HIGHBITDEPTH
98
99 /* Coefficients are predicted via a 3-dimensional probability table. */
100
101 #define REF_TYPES 2 // intra=0, inter=1
102
103 /* Middle dimension reflects the coefficient position within the transform. */
104 #define COEF_BANDS 6
105
106 /* Inside dimension is measure of nearby complexity, that reflects the energy
107 of nearby coefficients are nonzero. For the first coefficient (DC, unless
108 block type is 0), we look at the (already encoded) blocks above and to the
109 left of the current block. The context index is then the number (0,1,or 2)
110 of these blocks having nonzero coefficients.
111 After decoding a coefficient, the measure is determined by the size of the
112 most recently decoded coefficient.
113 Note that the intuitive meaning of this measure changes as coefficients
114 are decoded, e.g., prior to the first token, a zero means that my neighbors
115 are empty while, after the first token, because of the use of end-of-block,
116 a zero means we just decoded a zero and hence guarantees that a non-zero
117 coefficient will appear later in this block. However, this shift
118 in meaning is perfectly OK because our context depends also on the
119 coefficient band (and since zigzag positions 0, 1, and 2 are in
120 distinct bands). */
121
122 #define COEFF_CONTEXTS 6
123 #define BAND_COEFF_CONTEXTS(band) ((band) == 0 ? 3 : COEFF_CONTEXTS)
124
125 // #define ENTROPY_STATS
126
127 typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
128 [ENTROPY_TOKENS];
129 typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
130 [ENTROPY_NODES][2];
131
132 #define SUBEXP_PARAM 4 /* Subexponential code parameter */
133 #define MODULUS_PARAM 13 /* Modulus parameter */
134
135 struct VP9Common;
136 void vp9_default_coef_probs(struct VP9Common *cm);
137 void vp9_adapt_coef_probs(struct VP9Common *cm);
138
139 // This is the index in the scan order beyond which all coefficients for
140 // 8x8 transform and above are in the top band.
141 // This macro is currently unused but may be used by certain implementations
142 #define MAXBAND_INDEX 21
143
144 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_8x8plus[1024]);
145 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_4x4[16]);
146
get_band_translate(TX_SIZE tx_size)147 static INLINE const uint8_t *get_band_translate(TX_SIZE tx_size) {
148 return tx_size == TX_4X4 ? vp9_coefband_trans_4x4
149 : vp9_coefband_trans_8x8plus;
150 }
151
152 // 128 lists of probabilities are stored for the following ONE node probs:
153 // 1, 3, 5, 7, ..., 253, 255
154 // In between probabilities are interpolated linearly
155
156 #define COEFF_PROB_MODELS 256
157
158 #define UNCONSTRAINED_NODES 3
159
160 #define PIVOT_NODE 2 // which node is pivot
161
162 #define MODEL_NODES (ENTROPY_NODES - UNCONSTRAINED_NODES)
163 extern const vpx_tree_index vp9_coef_con_tree[TREE_SIZE(ENTROPY_TOKENS)];
164 extern const vpx_prob vp9_pareto8_full[COEFF_PROB_MODELS][MODEL_NODES];
165
166 typedef vpx_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS]
167 [COEFF_CONTEXTS][UNCONSTRAINED_NODES];
168
169 typedef unsigned int vp9_coeff_count_model[REF_TYPES][COEF_BANDS]
170 [COEFF_CONTEXTS]
171 [UNCONSTRAINED_NODES + 1];
172
173 void vp9_model_to_full_probs(const vpx_prob *model, vpx_prob *full);
174
175 typedef char ENTROPY_CONTEXT;
176
combine_entropy_contexts(ENTROPY_CONTEXT a,ENTROPY_CONTEXT b)177 static INLINE int combine_entropy_contexts(ENTROPY_CONTEXT a,
178 ENTROPY_CONTEXT b) {
179 return (a != 0) + (b != 0);
180 }
181
get_entropy_context(TX_SIZE tx_size,const ENTROPY_CONTEXT * a,const ENTROPY_CONTEXT * l)182 static INLINE int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
183 const ENTROPY_CONTEXT *l) {
184 ENTROPY_CONTEXT above_ec = 0, left_ec = 0;
185
186 switch (tx_size) {
187 case TX_4X4:
188 above_ec = a[0] != 0;
189 left_ec = l[0] != 0;
190 break;
191 case TX_8X8:
192 above_ec = !!*(const uint16_t *)a;
193 left_ec = !!*(const uint16_t *)l;
194 break;
195 case TX_16X16:
196 above_ec = !!*(const uint32_t *)a;
197 left_ec = !!*(const uint32_t *)l;
198 break;
199 case TX_32X32:
200 above_ec = !!*(const uint64_t *)a;
201 left_ec = !!*(const uint64_t *)l;
202 break;
203 default:
204 assert(0 && "Invalid transform size.");
205 break;
206 }
207
208 return combine_entropy_contexts(above_ec, left_ec);
209 }
210
211 #ifdef __cplusplus
212 } // extern "C"
213 #endif
214
215 #endif // VP9_COMMON_VP9_ENTROPY_H_
216