2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
11 #ifndef VP9_COMMON_VP9_ENTROPY_H_
12 #define VP9_COMMON_VP9_ENTROPY_H_
14 #include "vpx/vpx_integer.h"
16 #include "vp9/common/vp9_blockd.h"
17 #include "vp9/common/vp9_common.h"
18 #include "vp9/common/vp9_scan.h"
24 #define DIFF_UPDATE_PROB 252
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
40 #define ENTROPY_TOKENS 12
42 #define ENTROPY_NODES 11
44 DECLARE_ALIGNED(16, extern const uint8_t, vp9_pt_energy_class[ENTROPY_TOKENS]);
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
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]);
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
76 #define EOB_MODEL_TOKEN 3
77 extern const vp9_tree_index vp9_coefmodel_tree[];
80 const vp9_tree_index *tree;
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
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
99 /* Coefficients are predicted via a 3-dimensional probability table. */
101 #define REF_TYPES 2 // intra=0, inter=1
103 /* Middle dimension reflects the coefficient position within the transform. */
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
122 #define COEFF_CONTEXTS 6
123 #define BAND_COEFF_CONTEXTS(band) ((band) == 0 ? 3 : COEFF_CONTEXTS)
125 // #define ENTROPY_STATS
127 typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
129 typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
132 #define SUBEXP_PARAM 4 /* Subexponential code parameter */
133 #define MODULUS_PARAM 13 /* Modulus parameter */
136 void vp9_default_coef_probs(struct VP9Common *cm);
137 void vp9_adapt_coef_probs(struct VP9Common *cm);
139 static INLINE void reset_skip_context(MACROBLOCKD *xd, BLOCK_SIZE bsize) {
141 for (i = 0; i < MAX_MB_PLANE; i++) {
142 struct macroblockd_plane *const pd = &xd->plane[i];
143 const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
144 vpx_memset(pd->above_context, 0, sizeof(ENTROPY_CONTEXT) *
145 num_4x4_blocks_wide_lookup[plane_bsize]);
146 vpx_memset(pd->left_context, 0, sizeof(ENTROPY_CONTEXT) *
147 num_4x4_blocks_high_lookup[plane_bsize]);
151 // This is the index in the scan order beyond which all coefficients for
152 // 8x8 transform and above are in the top band.
153 // This macro is currently unused but may be used by certain implementations
154 #define MAXBAND_INDEX 21
156 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_8x8plus[1024]);
157 DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_4x4[16]);
159 static INLINE const uint8_t *get_band_translate(TX_SIZE tx_size) {
160 return tx_size == TX_4X4 ? vp9_coefband_trans_4x4
161 : vp9_coefband_trans_8x8plus;
164 // 128 lists of probabilities are stored for the following ONE node probs:
165 // 1, 3, 5, 7, ..., 253, 255
166 // In between probabilities are interpolated linearly
168 #define COEFF_PROB_MODELS 256
170 #define UNCONSTRAINED_NODES 3
172 #define PIVOT_NODE 2 // which node is pivot
174 #define MODEL_NODES (ENTROPY_NODES - UNCONSTRAINED_NODES)
175 extern const vp9_prob vp9_pareto8_full[COEFF_PROB_MODELS][MODEL_NODES];
177 typedef vp9_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS]
178 [COEFF_CONTEXTS][UNCONSTRAINED_NODES];
180 typedef unsigned int vp9_coeff_count_model[REF_TYPES][COEF_BANDS]
182 [UNCONSTRAINED_NODES + 1];
184 void vp9_model_to_full_probs(const vp9_prob *model, vp9_prob *full);
186 static INLINE int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
187 const ENTROPY_CONTEXT *l) {
188 ENTROPY_CONTEXT above_ec = 0, left_ec = 0;
192 above_ec = a[0] != 0;
196 above_ec = !!*(const uint16_t *)a;
197 left_ec = !!*(const uint16_t *)l;
200 above_ec = !!*(const uint32_t *)a;
201 left_ec = !!*(const uint32_t *)l;
204 above_ec = !!*(const uint64_t *)a;
205 left_ec = !!*(const uint64_t *)l;
208 assert(0 && "Invalid transform size.");
212 return combine_entropy_contexts(above_ec, left_ec);
215 static INLINE const scan_order *get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
216 PLANE_TYPE type, int block_idx) {
217 const MODE_INFO *const mi = xd->mi[0].src_mi;
219 if (is_inter_block(&mi->mbmi) || type != PLANE_TYPE_Y || xd->lossless) {
220 return &vp9_default_scan_orders[tx_size];
222 const PREDICTION_MODE mode = get_y_mode(mi, block_idx);
223 return &vp9_scan_orders[tx_size][intra_mode_to_tx_type_lookup[mode]];
231 #endif // VP9_COMMON_VP9_ENTROPY_H_