media/libvpx/vp9/decoder/vp9_detokenize.c@ac0c01689b40
media/libvpx/vp9/decoder/vp9_detokenize.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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 */
11 #include "vpx_mem/vpx_mem.h"
12 #include "vpx_ports/mem.h"
14 #include "vp9/common/vp9_blockd.h"
15 #include "vp9/common/vp9_common.h"
16 #include "vp9/common/vp9_seg_common.h"
18 #include "vp9/decoder/vp9_dboolhuff.h"
19 #include "vp9/decoder/vp9_detokenize.h"
20 #include "vp9/decoder/vp9_onyxd_int.h"
21 #include "vp9/decoder/vp9_treereader.h"
23 #define EOB_CONTEXT_NODE 0
24 #define ZERO_CONTEXT_NODE 1
25 #define ONE_CONTEXT_NODE 2
26 #define LOW_VAL_CONTEXT_NODE 3
27 #define TWO_CONTEXT_NODE 4
28 #define THREE_CONTEXT_NODE 5
29 #define HIGH_LOW_CONTEXT_NODE 6
30 #define CAT_ONE_CONTEXT_NODE 7
31 #define CAT_THREEFOUR_CONTEXT_NODE 8
32 #define CAT_THREE_CONTEXT_NODE 9
33 #define CAT_FIVE_CONTEXT_NODE 10
35 #define CAT1_MIN_VAL 5
36 #define CAT2_MIN_VAL 7
37 #define CAT3_MIN_VAL 11
38 #define CAT4_MIN_VAL 19
39 #define CAT5_MIN_VAL 35
40 #define CAT6_MIN_VAL 67
41 #define CAT1_PROB0 159
42 #define CAT2_PROB0 145
43 #define CAT2_PROB1 165
45 #define CAT3_PROB0 140
46 #define CAT3_PROB1 148
47 #define CAT3_PROB2 173
49 #define CAT4_PROB0 135
50 #define CAT4_PROB1 140
51 #define CAT4_PROB2 155
52 #define CAT4_PROB3 176
54 #define CAT5_PROB0 130
55 #define CAT5_PROB1 134
56 #define CAT5_PROB2 141
57 #define CAT5_PROB3 157
58 #define CAT5_PROB4 180
60 static const vp9_prob cat6_prob[15] = {
61 254, 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0
62 };
64 static const int token_to_counttoken[MAX_ENTROPY_TOKENS] = {
65 ZERO_TOKEN, ONE_TOKEN, TWO_TOKEN, TWO_TOKEN,
66 TWO_TOKEN, TWO_TOKEN, TWO_TOKEN, TWO_TOKEN,
67 TWO_TOKEN, TWO_TOKEN, TWO_TOKEN, DCT_EOB_MODEL_TOKEN
68 };
70 #define INCREMENT_COUNT(token) \
71 do { \
72 if (!cm->frame_parallel_decoding_mode) \
73 ++coef_counts[band][pt][token_to_counttoken[token]]; \
74 } while (0)
77 #define WRITE_COEF_CONTINUE(val, token) \
78 { \
79 dqcoeff_ptr[scan[c]] = (vp9_read_bit(r) ? -val : val) * \
80 dq[c > 0] / (1 + (tx_size == TX_32X32)); \
81 INCREMENT_COUNT(token); \
82 token_cache[scan[c]] = vp9_pt_energy_class[token]; \
83 ++c; \
84 continue; \
85 }
87 #define ADJUST_COEF(prob, bits_count) \
88 do { \
89 val += (vp9_read(r, prob) << bits_count); \
90 } while (0)
92 static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd,
93 vp9_reader *r, int block_idx,
94 PLANE_TYPE type, int seg_eob, int16_t *dqcoeff_ptr,
95 TX_SIZE tx_size, const int16_t *dq, int pt,
96 uint8_t *token_cache) {
97 const FRAME_CONTEXT *const fc = &cm->fc;
98 FRAME_COUNTS *const counts = &cm->counts;
99 const int ref = is_inter_block(&xd->mi_8x8[0]->mbmi);
100 int band, c = 0;
101 const vp9_prob (*coef_probs)[PREV_COEF_CONTEXTS][UNCONSTRAINED_NODES] =
102 fc->coef_probs[tx_size][type][ref];
103 vp9_prob coef_probs_full[COEF_BANDS][PREV_COEF_CONTEXTS][ENTROPY_NODES];
104 uint8_t load_map[COEF_BANDS][PREV_COEF_CONTEXTS] = { { 0 } };
105 const vp9_prob *prob;
106 unsigned int (*coef_counts)[PREV_COEF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
107 counts->coef[tx_size][type][ref];
108 unsigned int (*eob_branch_count)[PREV_COEF_CONTEXTS] =
109 counts->eob_branch[tx_size][type][ref];
110 const int16_t *scan, *nb;
111 const uint8_t *cat6;
112 const uint8_t *band_translate = get_band_translate(tx_size);
113 get_scan(xd, tx_size, type, block_idx, &scan, &nb);
115 while (c < seg_eob) {
116 int val;
117 if (c)
118 pt = get_coef_context(nb, token_cache, c);
119 band = *band_translate++;
120 prob = coef_probs[band][pt];
121 if (!cm->frame_parallel_decoding_mode)
122 ++eob_branch_count[band][pt];
123 if (!vp9_read(r, prob[EOB_CONTEXT_NODE]))
124 break;
125 goto DECODE_ZERO;
127 SKIP_START:
128 if (c >= seg_eob)
129 break;
130 if (c)
131 pt = get_coef_context(nb, token_cache, c);
132 band = *band_translate++;
133 prob = coef_probs[band][pt];
135 DECODE_ZERO:
136 if (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
137 INCREMENT_COUNT(ZERO_TOKEN);
138 token_cache[scan[c]] = vp9_pt_energy_class[ZERO_TOKEN];
139 ++c;
140 goto SKIP_START;
141 }
143 // ONE_CONTEXT_NODE_0_
144 if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
145 WRITE_COEF_CONTINUE(1, ONE_TOKEN);
146 }
147 // Load full probabilities if not already loaded
148 if (!load_map[band][pt]) {
149 vp9_model_to_full_probs(coef_probs[band][pt],
150 coef_probs_full[band][pt]);
151 load_map[band][pt] = 1;
152 }
153 prob = coef_probs_full[band][pt];
154 // LOW_VAL_CONTEXT_NODE_0_
155 if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) {
156 if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) {
157 WRITE_COEF_CONTINUE(2, TWO_TOKEN);
158 }
159 if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) {
160 WRITE_COEF_CONTINUE(3, THREE_TOKEN);
161 }
162 WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
163 }
164 // HIGH_LOW_CONTEXT_NODE_0_
165 if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) {
166 if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) {
167 val = CAT1_MIN_VAL;
168 ADJUST_COEF(CAT1_PROB0, 0);
169 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY1);
170 }
171 val = CAT2_MIN_VAL;
172 ADJUST_COEF(CAT2_PROB1, 1);
173 ADJUST_COEF(CAT2_PROB0, 0);
174 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY2);
175 }
176 // CAT_THREEFOUR_CONTEXT_NODE_0_
177 if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
178 if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) {
179 val = CAT3_MIN_VAL;
180 ADJUST_COEF(CAT3_PROB2, 2);
181 ADJUST_COEF(CAT3_PROB1, 1);
182 ADJUST_COEF(CAT3_PROB0, 0);
183 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY3);
184 }
185 val = CAT4_MIN_VAL;
186 ADJUST_COEF(CAT4_PROB3, 3);
187 ADJUST_COEF(CAT4_PROB2, 2);
188 ADJUST_COEF(CAT4_PROB1, 1);
189 ADJUST_COEF(CAT4_PROB0, 0);
190 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY4);
191 }
192 // CAT_FIVE_CONTEXT_NODE_0_:
193 if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) {
194 val = CAT5_MIN_VAL;
195 ADJUST_COEF(CAT5_PROB4, 4);
196 ADJUST_COEF(CAT5_PROB3, 3);
197 ADJUST_COEF(CAT5_PROB2, 2);
198 ADJUST_COEF(CAT5_PROB1, 1);
199 ADJUST_COEF(CAT5_PROB0, 0);
200 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY5);
201 }
202 val = 0;
203 cat6 = cat6_prob;
204 while (*cat6)
205 val = (val << 1) | vp9_read(r, *cat6++);
206 val += CAT6_MIN_VAL;
208 WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY6);
209 }
211 if (c < seg_eob) {
212 if (!cm->frame_parallel_decoding_mode)
213 ++coef_counts[band][pt][DCT_EOB_MODEL_TOKEN];
214 }
216 return c;
217 }
219 int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd,
220 int plane, int block, BLOCK_SIZE plane_bsize,
221 int x, int y, TX_SIZE tx_size, vp9_reader *r,
222 uint8_t *token_cache) {
223 struct macroblockd_plane *const pd = &xd->plane[plane];
224 const int seg_eob = get_tx_eob(&cm->seg, xd->mi_8x8[0]->mbmi.segment_id,
225 tx_size);
226 const int pt = get_entropy_context(tx_size, pd->above_context + x,
227 pd->left_context + y);
228 const int eob = decode_coefs(cm, xd, r, block, pd->plane_type, seg_eob,
229 BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
230 pd->dequant, pt, token_cache);
231 set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
232 pd->eobs[block] = eob;
233 return eob;
234 }
