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 #include "vpx_mem/vpx_mem.h"
12 #include "vpx_ports/mem.h"
13
14 #include "vp9/common/vp9_blockd.h"
15 #include "vp9/common/vp9_common.h"
16
17 #include "vp9/decoder/vp9_detokenize.h"
18
19 #define EOB_CONTEXT_NODE 0
20 #define ZERO_CONTEXT_NODE 1
21 #define ONE_CONTEXT_NODE 2
22 #define LOW_VAL_CONTEXT_NODE 0
23 #define TWO_CONTEXT_NODE 1
24 #define THREE_CONTEXT_NODE 2
25 #define HIGH_LOW_CONTEXT_NODE 3
26 #define CAT_ONE_CONTEXT_NODE 4
27 #define CAT_THREEFOUR_CONTEXT_NODE 5
28 #define CAT_THREE_CONTEXT_NODE 6
29 #define CAT_FIVE_CONTEXT_NODE 7
30
31 #define CAT1_MIN_VAL 5
32 #define CAT2_MIN_VAL 7
33 #define CAT3_MIN_VAL 11
34 #define CAT4_MIN_VAL 19
35 #define CAT5_MIN_VAL 35
36 #define CAT6_MIN_VAL 67
37 #define CAT1_PROB0 159
38 #define CAT2_PROB0 145
39 #define CAT2_PROB1 165
40
41 #define CAT3_PROB0 140
42 #define CAT3_PROB1 148
43 #define CAT3_PROB2 173
44
45 #define CAT4_PROB0 135
46 #define CAT4_PROB1 140
47 #define CAT4_PROB2 155
48 #define CAT4_PROB3 176
49
50 #define CAT5_PROB0 130
51 #define CAT5_PROB1 134
52 #define CAT5_PROB2 141
53 #define CAT5_PROB3 157
54 #define CAT5_PROB4 180
55
56 static const vp9_prob cat6_prob[15] = {
57 254, 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0
58 };
59
60 #define INCREMENT_COUNT(token) \
61 do { \
62 if (!cm->frame_parallel_decoding_mode) \
63 ++coef_counts[band][ctx][token]; \
64 } while (0)
65
66 #define WRITE_COEF_CONTINUE(val, token) \
67 { \
68 v = (val * dqv) >> dq_shift; \
69 dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v; \
70 token_cache[scan[c]] = vp9_pt_energy_class[token]; \
71 ++c; \
72 ctx = get_coef_context(nb, token_cache, c); \
73 dqv = dq[1]; \
74 continue; \
75 }
76
77 #define ADJUST_COEF(prob, bits_count) \
78 do { \
79 val += (vp9_read(r, prob) << bits_count); \
80 } while (0)
81
decode_coefs(VP9_COMMON * cm,const MACROBLOCKD * xd,PLANE_TYPE type,int16_t * dqcoeff,TX_SIZE tx_size,const int16_t * dq,int ctx,const int16_t * scan,const int16_t * nb,vp9_reader * r)82 static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, PLANE_TYPE type,
83 int16_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
84 int ctx, const int16_t *scan, const int16_t *nb,
85 vp9_reader *r) {
86 const int max_eob = 16 << (tx_size << 1);
87 const FRAME_CONTEXT *const fc = &cm->fc;
88 FRAME_COUNTS *const counts = &cm->counts;
89 const int ref = is_inter_block(&xd->mi[0]->mbmi);
90 int band, c = 0;
91 const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
92 fc->coef_probs[tx_size][type][ref];
93 const vp9_prob *prob;
94 unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
95 counts->coef[tx_size][type][ref];
96 unsigned int (*eob_branch_count)[COEFF_CONTEXTS] =
97 counts->eob_branch[tx_size][type][ref];
98 uint8_t token_cache[32 * 32];
99 const uint8_t *cat6;
100 const uint8_t *band_translate = get_band_translate(tx_size);
101 const int dq_shift = (tx_size == TX_32X32);
102 int v;
103 int16_t dqv = dq[0];
104
105 while (c < max_eob) {
106 int val;
107 band = *band_translate++;
108 prob = coef_probs[band][ctx];
109 if (!cm->frame_parallel_decoding_mode)
110 ++eob_branch_count[band][ctx];
111 if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) {
112 INCREMENT_COUNT(EOB_MODEL_TOKEN);
113 break;
114 }
115
116 while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
117 INCREMENT_COUNT(ZERO_TOKEN);
118 dqv = dq[1];
119 token_cache[scan[c]] = 0;
120 ++c;
121 if (c >= max_eob)
122 return c; // zero tokens at the end (no eob token)
123 ctx = get_coef_context(nb, token_cache, c);
124 band = *band_translate++;
125 prob = coef_probs[band][ctx];
126 }
127
128 // ONE_CONTEXT_NODE_0_
129 if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
130 INCREMENT_COUNT(ONE_TOKEN);
131 WRITE_COEF_CONTINUE(1, ONE_TOKEN);
132 }
133
134 INCREMENT_COUNT(TWO_TOKEN);
135
136 prob = vp9_pareto8_full[prob[PIVOT_NODE] - 1];
137
138 if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) {
139 if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) {
140 WRITE_COEF_CONTINUE(2, TWO_TOKEN);
141 }
142 if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) {
143 WRITE_COEF_CONTINUE(3, THREE_TOKEN);
144 }
145 WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
146 }
147
148 if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) {
149 if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) {
150 val = CAT1_MIN_VAL;
151 ADJUST_COEF(CAT1_PROB0, 0);
152 WRITE_COEF_CONTINUE(val, CATEGORY1_TOKEN);
153 }
154 val = CAT2_MIN_VAL;
155 ADJUST_COEF(CAT2_PROB1, 1);
156 ADJUST_COEF(CAT2_PROB0, 0);
157 WRITE_COEF_CONTINUE(val, CATEGORY2_TOKEN);
158 }
159
160 if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
161 if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) {
162 val = CAT3_MIN_VAL;
163 ADJUST_COEF(CAT3_PROB2, 2);
164 ADJUST_COEF(CAT3_PROB1, 1);
165 ADJUST_COEF(CAT3_PROB0, 0);
166 WRITE_COEF_CONTINUE(val, CATEGORY3_TOKEN);
167 }
168 val = CAT4_MIN_VAL;
169 ADJUST_COEF(CAT4_PROB3, 3);
170 ADJUST_COEF(CAT4_PROB2, 2);
171 ADJUST_COEF(CAT4_PROB1, 1);
172 ADJUST_COEF(CAT4_PROB0, 0);
173 WRITE_COEF_CONTINUE(val, CATEGORY4_TOKEN);
174 }
175
176 if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) {
177 val = CAT5_MIN_VAL;
178 ADJUST_COEF(CAT5_PROB4, 4);
179 ADJUST_COEF(CAT5_PROB3, 3);
180 ADJUST_COEF(CAT5_PROB2, 2);
181 ADJUST_COEF(CAT5_PROB1, 1);
182 ADJUST_COEF(CAT5_PROB0, 0);
183 WRITE_COEF_CONTINUE(val, CATEGORY5_TOKEN);
184 }
185 val = 0;
186 cat6 = cat6_prob;
187 while (*cat6)
188 val = (val << 1) | vp9_read(r, *cat6++);
189 val += CAT6_MIN_VAL;
190
191 WRITE_COEF_CONTINUE(val, CATEGORY6_TOKEN);
192 }
193
194 return c;
195 }
196
vp9_decode_block_tokens(VP9_COMMON * cm,MACROBLOCKD * xd,int plane,int block,BLOCK_SIZE plane_bsize,int x,int y,TX_SIZE tx_size,vp9_reader * r)197 int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd,
198 int plane, int block, BLOCK_SIZE plane_bsize,
199 int x, int y, TX_SIZE tx_size, vp9_reader *r) {
200 struct macroblockd_plane *const pd = &xd->plane[plane];
201 const int ctx = get_entropy_context(tx_size, pd->above_context + x,
202 pd->left_context + y);
203 const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block);
204 const int eob = decode_coefs(cm, xd, pd->plane_type,
205 BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
206 pd->dequant, ctx, so->scan, so->neighbors, r);
207 vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
208 return eob;
209 }
210
211
212