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
56static 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
82static 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
197int 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