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_ENTROPYMODE_H_
13 #define AOM_AV1_COMMON_ENTROPYMODE_H_
14
15 #include "av1/common/entropy.h"
16 #include "av1/common/entropymv.h"
17 #include "av1/common/filter.h"
18 #include "av1/common/seg_common.h"
19 #include "aom_dsp/aom_filter.h"
20
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24
25 #define BLOCK_SIZE_GROUPS 4
26
27 #define TX_SIZE_CONTEXTS 3
28
29 #define INTER_OFFSET(mode) ((mode)-NEARESTMV)
30 #define INTER_COMPOUND_OFFSET(mode) (uint8_t)((mode)-NEAREST_NEARESTMV)
31
32 // Number of possible contexts for a color index.
33 // As can be seen from av1_get_palette_color_index_context(), the possible
34 // contexts are (2,0,0), (2,2,1), (3,2,0), (4,1,0), (5,0,0). These are mapped to
35 // a value from 0 to 4 using 'palette_color_index_context_lookup' table.
36 #define PALETTE_COLOR_INDEX_CONTEXTS 5
37
38 // Palette Y mode context for a block is determined by number of neighboring
39 // blocks (top and/or left) using a palette for Y plane. So, possible Y mode'
40 // context values are:
41 // 0 if neither left nor top block uses palette for Y plane,
42 // 1 if exactly one of left or top block uses palette for Y plane, and
43 // 2 if both left and top blocks use palette for Y plane.
44 #define PALETTE_Y_MODE_CONTEXTS 3
45
46 // Palette UV mode context for a block is determined by whether this block uses
47 // palette for the Y plane. So, possible values are:
48 // 0 if this block doesn't use palette for Y plane.
49 // 1 if this block uses palette for Y plane (i.e. Y palette size > 0).
50 #define PALETTE_UV_MODE_CONTEXTS 2
51
52 // Map the number of pixels in a block size to a context
53 // 64(BLOCK_8X8, BLOCK_4x16, BLOCK_16X4) -> 0
54 // 128(BLOCK_8X16, BLOCK_16x8) -> 1
55 // ...
56 // 4096(BLOCK_64X64) -> 6
57 #define PALATTE_BSIZE_CTXS 7
58
59 #define KF_MODE_CONTEXTS 5
60
61 struct AV1Common;
62
63 typedef struct {
64 const int16_t *scan;
65 const int16_t *iscan;
66 const int16_t *neighbors;
67 } SCAN_ORDER;
68
69 typedef struct frame_contexts {
70 aom_cdf_prob txb_skip_cdf[TX_SIZES][TXB_SKIP_CONTEXTS][CDF_SIZE(2)];
71 aom_cdf_prob eob_extra_cdf[TX_SIZES][PLANE_TYPES][EOB_COEF_CONTEXTS]
72 [CDF_SIZE(2)];
73 aom_cdf_prob dc_sign_cdf[PLANE_TYPES][DC_SIGN_CONTEXTS][CDF_SIZE(2)];
74 aom_cdf_prob eob_flag_cdf16[PLANE_TYPES][2][CDF_SIZE(5)];
75 aom_cdf_prob eob_flag_cdf32[PLANE_TYPES][2][CDF_SIZE(6)];
76 aom_cdf_prob eob_flag_cdf64[PLANE_TYPES][2][CDF_SIZE(7)];
77 aom_cdf_prob eob_flag_cdf128[PLANE_TYPES][2][CDF_SIZE(8)];
78 aom_cdf_prob eob_flag_cdf256[PLANE_TYPES][2][CDF_SIZE(9)];
79 aom_cdf_prob eob_flag_cdf512[PLANE_TYPES][2][CDF_SIZE(10)];
80 aom_cdf_prob eob_flag_cdf1024[PLANE_TYPES][2][CDF_SIZE(11)];
81 aom_cdf_prob coeff_base_eob_cdf[TX_SIZES][PLANE_TYPES][SIG_COEF_CONTEXTS_EOB]
82 [CDF_SIZE(3)];
83 aom_cdf_prob coeff_base_cdf[TX_SIZES][PLANE_TYPES][SIG_COEF_CONTEXTS]
84 [CDF_SIZE(4)];
85 aom_cdf_prob coeff_br_cdf[TX_SIZES][PLANE_TYPES][LEVEL_CONTEXTS]
86 [CDF_SIZE(BR_CDF_SIZE)];
87
88 aom_cdf_prob newmv_cdf[NEWMV_MODE_CONTEXTS][CDF_SIZE(2)];
89 aom_cdf_prob zeromv_cdf[GLOBALMV_MODE_CONTEXTS][CDF_SIZE(2)];
90 aom_cdf_prob refmv_cdf[REFMV_MODE_CONTEXTS][CDF_SIZE(2)];
91 aom_cdf_prob drl_cdf[DRL_MODE_CONTEXTS][CDF_SIZE(2)];
92
93 aom_cdf_prob inter_compound_mode_cdf[INTER_MODE_CONTEXTS]
94 [CDF_SIZE(INTER_COMPOUND_MODES)];
95 aom_cdf_prob compound_type_cdf[BLOCK_SIZES_ALL][CDF_SIZE(COMPOUND_TYPES - 1)];
96 aom_cdf_prob wedge_idx_cdf[BLOCK_SIZES_ALL][CDF_SIZE(16)];
97 aom_cdf_prob interintra_cdf[BLOCK_SIZE_GROUPS][CDF_SIZE(2)];
98 aom_cdf_prob wedge_interintra_cdf[BLOCK_SIZES_ALL][CDF_SIZE(2)];
99 aom_cdf_prob interintra_mode_cdf[BLOCK_SIZE_GROUPS]
100 [CDF_SIZE(INTERINTRA_MODES)];
101 aom_cdf_prob motion_mode_cdf[BLOCK_SIZES_ALL][CDF_SIZE(MOTION_MODES)];
102 aom_cdf_prob obmc_cdf[BLOCK_SIZES_ALL][CDF_SIZE(2)];
103 aom_cdf_prob palette_y_size_cdf[PALATTE_BSIZE_CTXS][CDF_SIZE(PALETTE_SIZES)];
104 aom_cdf_prob palette_uv_size_cdf[PALATTE_BSIZE_CTXS][CDF_SIZE(PALETTE_SIZES)];
105 aom_cdf_prob palette_y_color_index_cdf[PALETTE_SIZES]
106 [PALETTE_COLOR_INDEX_CONTEXTS]
107 [CDF_SIZE(PALETTE_COLORS)];
108 aom_cdf_prob palette_uv_color_index_cdf[PALETTE_SIZES]
109 [PALETTE_COLOR_INDEX_CONTEXTS]
110 [CDF_SIZE(PALETTE_COLORS)];
111 aom_cdf_prob palette_y_mode_cdf[PALATTE_BSIZE_CTXS][PALETTE_Y_MODE_CONTEXTS]
112 [CDF_SIZE(2)];
113 aom_cdf_prob palette_uv_mode_cdf[PALETTE_UV_MODE_CONTEXTS][CDF_SIZE(2)];
114 aom_cdf_prob comp_inter_cdf[COMP_INTER_CONTEXTS][CDF_SIZE(2)];
115 aom_cdf_prob single_ref_cdf[REF_CONTEXTS][SINGLE_REFS - 1][CDF_SIZE(2)];
116 aom_cdf_prob comp_ref_type_cdf[COMP_REF_TYPE_CONTEXTS][CDF_SIZE(2)];
117 aom_cdf_prob uni_comp_ref_cdf[UNI_COMP_REF_CONTEXTS][UNIDIR_COMP_REFS - 1]
118 [CDF_SIZE(2)];
119 aom_cdf_prob comp_ref_cdf[REF_CONTEXTS][FWD_REFS - 1][CDF_SIZE(2)];
120 aom_cdf_prob comp_bwdref_cdf[REF_CONTEXTS][BWD_REFS - 1][CDF_SIZE(2)];
121 aom_cdf_prob txfm_partition_cdf[TXFM_PARTITION_CONTEXTS][CDF_SIZE(2)];
122 aom_cdf_prob compound_index_cdf[COMP_INDEX_CONTEXTS][CDF_SIZE(2)];
123 aom_cdf_prob comp_group_idx_cdf[COMP_GROUP_IDX_CONTEXTS][CDF_SIZE(2)];
124 aom_cdf_prob skip_mode_cdfs[SKIP_CONTEXTS][CDF_SIZE(2)];
125 aom_cdf_prob skip_cdfs[SKIP_CONTEXTS][CDF_SIZE(2)];
126 aom_cdf_prob intra_inter_cdf[INTRA_INTER_CONTEXTS][CDF_SIZE(2)];
127 nmv_context nmvc;
128 nmv_context ndvc;
129 aom_cdf_prob intrabc_cdf[CDF_SIZE(2)];
130 struct segmentation_probs seg;
131 aom_cdf_prob filter_intra_cdfs[BLOCK_SIZES_ALL][CDF_SIZE(2)];
132 aom_cdf_prob filter_intra_mode_cdf[CDF_SIZE(FILTER_INTRA_MODES)];
133 aom_cdf_prob switchable_restore_cdf[CDF_SIZE(RESTORE_SWITCHABLE_TYPES)];
134 aom_cdf_prob wiener_restore_cdf[CDF_SIZE(2)];
135 aom_cdf_prob sgrproj_restore_cdf[CDF_SIZE(2)];
136 aom_cdf_prob y_mode_cdf[BLOCK_SIZE_GROUPS][CDF_SIZE(INTRA_MODES)];
137 aom_cdf_prob uv_mode_cdf[CFL_ALLOWED_TYPES][INTRA_MODES]
138 [CDF_SIZE(UV_INTRA_MODES)];
139 aom_cdf_prob partition_cdf[PARTITION_CONTEXTS][CDF_SIZE(EXT_PARTITION_TYPES)];
140 aom_cdf_prob switchable_interp_cdf[SWITCHABLE_FILTER_CONTEXTS]
141 [CDF_SIZE(SWITCHABLE_FILTERS)];
142 /* kf_y_cdf is discarded after use, so does not require persistent storage.
143 However, we keep it with the other CDFs in this struct since it needs to
144 be copied to each tile to support parallelism just like the others.
145 */
146 aom_cdf_prob kf_y_cdf[KF_MODE_CONTEXTS][KF_MODE_CONTEXTS]
147 [CDF_SIZE(INTRA_MODES)];
148
149 aom_cdf_prob angle_delta_cdf[DIRECTIONAL_MODES]
150 [CDF_SIZE(2 * MAX_ANGLE_DELTA + 1)];
151
152 aom_cdf_prob tx_size_cdf[MAX_TX_CATS][TX_SIZE_CONTEXTS]
153 [CDF_SIZE(MAX_TX_DEPTH + 1)];
154 aom_cdf_prob delta_q_cdf[CDF_SIZE(DELTA_Q_PROBS + 1)];
155 aom_cdf_prob delta_lf_multi_cdf[FRAME_LF_COUNT][CDF_SIZE(DELTA_LF_PROBS + 1)];
156 aom_cdf_prob delta_lf_cdf[CDF_SIZE(DELTA_LF_PROBS + 1)];
157 aom_cdf_prob intra_ext_tx_cdf[EXT_TX_SETS_INTRA][EXT_TX_SIZES][INTRA_MODES]
158 [CDF_SIZE(TX_TYPES)];
159 aom_cdf_prob inter_ext_tx_cdf[EXT_TX_SETS_INTER][EXT_TX_SIZES]
160 [CDF_SIZE(TX_TYPES)];
161 aom_cdf_prob cfl_sign_cdf[CDF_SIZE(CFL_JOINT_SIGNS)];
162 aom_cdf_prob cfl_alpha_cdf[CFL_ALPHA_CONTEXTS][CDF_SIZE(CFL_ALPHABET_SIZE)];
163 int initialized;
164 } FRAME_CONTEXT;
165
166 static const int av1_ext_tx_ind[EXT_TX_SET_TYPES][TX_TYPES] = {
167 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
168 { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
169 { 1, 3, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
170 { 1, 5, 6, 4, 0, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0 },
171 { 3, 4, 5, 8, 6, 7, 9, 10, 11, 0, 1, 2, 0, 0, 0, 0 },
172 { 7, 8, 9, 12, 10, 11, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6 },
173 };
174
175 static const int av1_ext_tx_inv[EXT_TX_SET_TYPES][TX_TYPES] = {
176 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
177 { 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
178 { 9, 0, 3, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
179 { 9, 0, 10, 11, 3, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
180 { 9, 10, 11, 0, 1, 2, 4, 5, 3, 6, 7, 8, 0, 0, 0, 0 },
181 { 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 4, 5, 3, 6, 7, 8 },
182 };
183
184 void av1_set_default_ref_deltas(int8_t *ref_deltas);
185 void av1_set_default_mode_deltas(int8_t *mode_deltas);
186 void av1_setup_frame_contexts(struct AV1Common *cm);
187 void av1_setup_past_independence(struct AV1Common *cm);
188
189 // Returns (int)ceil(log2(n)).
190 // NOTE: This implementation only works for n <= 2^30.
av1_ceil_log2(int n)191 static INLINE int av1_ceil_log2(int n) {
192 if (n < 2) return 0;
193 int i = 1, p = 2;
194 while (p < n) {
195 i++;
196 p = p << 1;
197 }
198 return i;
199 }
200
201 // Returns the context for palette color index at row 'r' and column 'c',
202 // along with the 'color_order' of neighbors and the 'color_idx'.
203 // The 'color_map' is a 2D array with the given 'stride'.
204 int av1_get_palette_color_index_context(const uint8_t *color_map, int stride,
205 int r, int c, int palette_size,
206 uint8_t *color_order, int *color_idx);
207
208 #ifdef __cplusplus
209 } // extern "C"
210 #endif
211
212 #endif // AOM_AV1_COMMON_ENTROPYMODE_H_
213