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 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 } 196 197 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
