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 #include "vp9/common/vp9_entropy.h"
17
18 #include "vp9/decoder/vp9_detokenize.h"
19
20 #define EOB_CONTEXT_NODE 0
21 #define ZERO_CONTEXT_NODE 1
22 #define ONE_CONTEXT_NODE 2
23 #define LOW_VAL_CONTEXT_NODE 0
24 #define TWO_CONTEXT_NODE 1
25 #define THREE_CONTEXT_NODE 2
26 #define HIGH_LOW_CONTEXT_NODE 3
27 #define CAT_ONE_CONTEXT_NODE 4
28 #define CAT_THREEFOUR_CONTEXT_NODE 5
29 #define CAT_THREE_CONTEXT_NODE 6
30 #define CAT_FIVE_CONTEXT_NODE 7
31
32 #define INCREMENT_COUNT(token) \
33 do { \
34 if (!cm->frame_parallel_decoding_mode) \
35 ++coef_counts[band][ctx][token]; \
36 } while (0)
37
read_coeff(const vp9_prob * probs,int n,vp9_reader * r)38 static INLINE int read_coeff(const vp9_prob *probs, int n, vp9_reader *r) {
39 int i, val = 0;
40 for (i = 0; i < n; ++i)
41 val = (val << 1) | vp9_read(r, probs[i]);
42 return val;
43 }
44
45 static const vp9_tree_index coeff_subtree_high[TREE_SIZE(ENTROPY_TOKENS)] = {
46 2, 6, /* 0 = LOW_VAL */
47 -TWO_TOKEN, 4, /* 1 = TWO */
48 -THREE_TOKEN, -FOUR_TOKEN, /* 2 = THREE */
49 8, 10, /* 3 = HIGH_LOW */
50 -CATEGORY1_TOKEN, -CATEGORY2_TOKEN, /* 4 = CAT_ONE */
51 12, 14, /* 5 = CAT_THREEFOUR */
52 -CATEGORY3_TOKEN, -CATEGORY4_TOKEN, /* 6 = CAT_THREE */
53 -CATEGORY5_TOKEN, -CATEGORY6_TOKEN /* 7 = CAT_FIVE */
54 };
55
decode_coefs(VP9_COMMON * cm,const MACROBLOCKD * xd,PLANE_TYPE type,tran_low_t * dqcoeff,TX_SIZE tx_size,const int16_t * dq,int ctx,const int16_t * scan,const int16_t * nb,vp9_reader * r)56 static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, PLANE_TYPE type,
57 tran_low_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
58 int ctx, const int16_t *scan, const int16_t *nb,
59 vp9_reader *r) {
60 const int max_eob = 16 << (tx_size << 1);
61 const FRAME_CONTEXT *const fc = &cm->fc;
62 FRAME_COUNTS *const counts = &cm->counts;
63 const int ref = is_inter_block(&xd->mi[0].src_mi->mbmi);
64 int band, c = 0;
65 const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
66 fc->coef_probs[tx_size][type][ref];
67 const vp9_prob *prob;
68 unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
69 counts->coef[tx_size][type][ref];
70 unsigned int (*eob_branch_count)[COEFF_CONTEXTS] =
71 counts->eob_branch[tx_size][type][ref];
72 uint8_t token_cache[32 * 32];
73 const uint8_t *band_translate = get_band_translate(tx_size);
74 const int dq_shift = (tx_size == TX_32X32);
75 int v, token;
76 int16_t dqv = dq[0];
77 const uint8_t *cat1_prob;
78 const uint8_t *cat2_prob;
79 const uint8_t *cat3_prob;
80 const uint8_t *cat4_prob;
81 const uint8_t *cat5_prob;
82 const uint8_t *cat6_prob;
83
84 #if CONFIG_VP9_HIGHBITDEPTH
85 if (cm->use_highbitdepth) {
86 if (cm->bit_depth == VPX_BITS_10) {
87 cat1_prob = vp9_cat1_prob_high10;
88 cat2_prob = vp9_cat2_prob_high10;
89 cat3_prob = vp9_cat3_prob_high10;
90 cat4_prob = vp9_cat4_prob_high10;
91 cat5_prob = vp9_cat5_prob_high10;
92 cat6_prob = vp9_cat6_prob_high10;
93 } else {
94 cat1_prob = vp9_cat1_prob_high12;
95 cat2_prob = vp9_cat2_prob_high12;
96 cat3_prob = vp9_cat3_prob_high12;
97 cat4_prob = vp9_cat4_prob_high12;
98 cat5_prob = vp9_cat5_prob_high12;
99 cat6_prob = vp9_cat6_prob_high12;
100 }
101 } else {
102 cat1_prob = vp9_cat1_prob;
103 cat2_prob = vp9_cat2_prob;
104 cat3_prob = vp9_cat3_prob;
105 cat4_prob = vp9_cat4_prob;
106 cat5_prob = vp9_cat5_prob;
107 cat6_prob = vp9_cat6_prob;
108 }
109 #else
110 cat1_prob = vp9_cat1_prob;
111 cat2_prob = vp9_cat2_prob;
112 cat3_prob = vp9_cat3_prob;
113 cat4_prob = vp9_cat4_prob;
114 cat5_prob = vp9_cat5_prob;
115 cat6_prob = vp9_cat6_prob;
116 #endif
117
118 while (c < max_eob) {
119 int val = -1;
120 band = *band_translate++;
121 prob = coef_probs[band][ctx];
122 if (!cm->frame_parallel_decoding_mode)
123 ++eob_branch_count[band][ctx];
124 if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) {
125 INCREMENT_COUNT(EOB_MODEL_TOKEN);
126 break;
127 }
128
129 while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
130 INCREMENT_COUNT(ZERO_TOKEN);
131 dqv = dq[1];
132 token_cache[scan[c]] = 0;
133 ++c;
134 if (c >= max_eob)
135 return c; // zero tokens at the end (no eob token)
136 ctx = get_coef_context(nb, token_cache, c);
137 band = *band_translate++;
138 prob = coef_probs[band][ctx];
139 }
140
141 if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
142 INCREMENT_COUNT(ONE_TOKEN);
143 token = ONE_TOKEN;
144 val = 1;
145 } else {
146 INCREMENT_COUNT(TWO_TOKEN);
147 token = vp9_read_tree(r, coeff_subtree_high,
148 vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
149 switch (token) {
150 case TWO_TOKEN:
151 case THREE_TOKEN:
152 case FOUR_TOKEN:
153 val = token;
154 break;
155 case CATEGORY1_TOKEN:
156 val = CAT1_MIN_VAL + read_coeff(cat1_prob, 1, r);
157 break;
158 case CATEGORY2_TOKEN:
159 val = CAT2_MIN_VAL + read_coeff(cat2_prob, 2, r);
160 break;
161 case CATEGORY3_TOKEN:
162 val = CAT3_MIN_VAL + read_coeff(cat3_prob, 3, r);
163 break;
164 case CATEGORY4_TOKEN:
165 val = CAT4_MIN_VAL + read_coeff(cat4_prob, 4, r);
166 break;
167 case CATEGORY5_TOKEN:
168 val = CAT5_MIN_VAL + read_coeff(cat5_prob, 5, r);
169 break;
170 case CATEGORY6_TOKEN:
171 #if CONFIG_VP9_HIGHBITDEPTH
172 switch (cm->bit_depth) {
173 case VPX_BITS_8:
174 val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
175 break;
176 case VPX_BITS_10:
177 val = CAT6_MIN_VAL + read_coeff(cat6_prob, 16, r);
178 break;
179 case VPX_BITS_12:
180 val = CAT6_MIN_VAL + read_coeff(cat6_prob, 18, r);
181 break;
182 default:
183 assert(0);
184 return -1;
185 }
186 #else
187 val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
188 #endif
189 break;
190 }
191 }
192 v = (val * dqv) >> dq_shift;
193 dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v;
194 token_cache[scan[c]] = vp9_pt_energy_class[token];
195 ++c;
196 ctx = get_coef_context(nb, token_cache, c);
197 dqv = dq[1];
198 }
199
200 return c;
201 }
202
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)203 int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd,
204 int plane, int block, BLOCK_SIZE plane_bsize,
205 int x, int y, TX_SIZE tx_size, vp9_reader *r) {
206 struct macroblockd_plane *const pd = &xd->plane[plane];
207 const int ctx = get_entropy_context(tx_size, pd->above_context + x,
208 pd->left_context + y);
209 const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block);
210 const int eob = decode_coefs(cm, xd, pd->plane_type,
211 BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
212 pd->dequant, ctx, so->scan, so->neighbors, r);
213 vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
214 return eob;
215 }
216
217
218