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 INCREMENT_COUNT(token) \ 32 do { \ 33 if (!cm->frame_parallel_decoding_mode) \ 34 ++coef_counts[band][ctx][token]; \ 35 } while (0) 36 37#define WRITE_COEF_CONTINUE(val, token) \ 38 { \ 39 v = (val * dqv) >> dq_shift; \ 40 dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v; \ 41 token_cache[scan[c]] = vp9_pt_energy_class[token]; \ 42 ++c; \ 43 ctx = get_coef_context(nb, token_cache, c); \ 44 dqv = dq[1]; \ 45 continue; \ 46 } 47 48#define ADJUST_COEF(prob, bits_count) \ 49 do { \ 50 val += (vp9_read(r, prob) << bits_count); \ 51 } while (0) 52 53static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, PLANE_TYPE type, 54 int16_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq, 55 int ctx, const int16_t *scan, const int16_t *nb, 56 vp9_reader *r) { 57 const int max_eob = 16 << (tx_size << 1); 58 const FRAME_CONTEXT *const fc = &cm->fc; 59 FRAME_COUNTS *const counts = &cm->counts; 60 const int ref = is_inter_block(&xd->mi[0]->mbmi); 61 int band, c = 0; 62 const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] = 63 fc->coef_probs[tx_size][type][ref]; 64 const vp9_prob *prob; 65 unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] = 66 counts->coef[tx_size][type][ref]; 67 unsigned int (*eob_branch_count)[COEFF_CONTEXTS] = 68 counts->eob_branch[tx_size][type][ref]; 69 uint8_t token_cache[32 * 32]; 70 const uint8_t *band_translate = get_band_translate(tx_size); 71 const int dq_shift = (tx_size == TX_32X32); 72 int v; 73 int16_t dqv = dq[0]; 74 75 while (c < max_eob) { 76 int val; 77 band = *band_translate++; 78 prob = coef_probs[band][ctx]; 79 if (!cm->frame_parallel_decoding_mode) 80 ++eob_branch_count[band][ctx]; 81 if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) { 82 INCREMENT_COUNT(EOB_MODEL_TOKEN); 83 break; 84 } 85 86 while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) { 87 INCREMENT_COUNT(ZERO_TOKEN); 88 dqv = dq[1]; 89 token_cache[scan[c]] = 0; 90 ++c; 91 if (c >= max_eob) 92 return c; // zero tokens at the end (no eob token) 93 ctx = get_coef_context(nb, token_cache, c); 94 band = *band_translate++; 95 prob = coef_probs[band][ctx]; 96 } 97 98 // ONE_CONTEXT_NODE_0_ 99 if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) { 100 INCREMENT_COUNT(ONE_TOKEN); 101 WRITE_COEF_CONTINUE(1, ONE_TOKEN); 102 } 103 104 INCREMENT_COUNT(TWO_TOKEN); 105 106 prob = vp9_pareto8_full[prob[PIVOT_NODE] - 1]; 107 108 if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) { 109 if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) { 110 WRITE_COEF_CONTINUE(2, TWO_TOKEN); 111 } 112 if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) { 113 WRITE_COEF_CONTINUE(3, THREE_TOKEN); 114 } 115 WRITE_COEF_CONTINUE(4, FOUR_TOKEN); 116 } 117 118 if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) { 119 if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) { 120 val = CAT1_MIN_VAL; 121 ADJUST_COEF(vp9_cat1_prob[0], 0); 122 WRITE_COEF_CONTINUE(val, CATEGORY1_TOKEN); 123 } 124 val = CAT2_MIN_VAL; 125 ADJUST_COEF(vp9_cat2_prob[0], 1); 126 ADJUST_COEF(vp9_cat2_prob[1], 0); 127 WRITE_COEF_CONTINUE(val, CATEGORY2_TOKEN); 128 } 129 130 if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) { 131 if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) { 132 val = CAT3_MIN_VAL; 133 ADJUST_COEF(vp9_cat3_prob[0], 2); 134 ADJUST_COEF(vp9_cat3_prob[1], 1); 135 ADJUST_COEF(vp9_cat3_prob[2], 0); 136 WRITE_COEF_CONTINUE(val, CATEGORY3_TOKEN); 137 } 138 val = CAT4_MIN_VAL; 139 ADJUST_COEF(vp9_cat4_prob[0], 3); 140 ADJUST_COEF(vp9_cat4_prob[1], 2); 141 ADJUST_COEF(vp9_cat4_prob[2], 1); 142 ADJUST_COEF(vp9_cat4_prob[3], 0); 143 WRITE_COEF_CONTINUE(val, CATEGORY4_TOKEN); 144 } 145 146 if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) { 147 val = CAT5_MIN_VAL; 148 ADJUST_COEF(vp9_cat5_prob[0], 4); 149 ADJUST_COEF(vp9_cat5_prob[1], 3); 150 ADJUST_COEF(vp9_cat5_prob[2], 2); 151 ADJUST_COEF(vp9_cat5_prob[3], 1); 152 ADJUST_COEF(vp9_cat5_prob[4], 0); 153 WRITE_COEF_CONTINUE(val, CATEGORY5_TOKEN); 154 } 155 val = 0; 156 val = (val << 1) | vp9_read(r, vp9_cat6_prob[0]); 157 val = (val << 1) | vp9_read(r, vp9_cat6_prob[1]); 158 val = (val << 1) | vp9_read(r, vp9_cat6_prob[2]); 159 val = (val << 1) | vp9_read(r, vp9_cat6_prob[3]); 160 val = (val << 1) | vp9_read(r, vp9_cat6_prob[4]); 161 val = (val << 1) | vp9_read(r, vp9_cat6_prob[5]); 162 val = (val << 1) | vp9_read(r, vp9_cat6_prob[6]); 163 val = (val << 1) | vp9_read(r, vp9_cat6_prob[7]); 164 val = (val << 1) | vp9_read(r, vp9_cat6_prob[8]); 165 val = (val << 1) | vp9_read(r, vp9_cat6_prob[9]); 166 val = (val << 1) | vp9_read(r, vp9_cat6_prob[10]); 167 val = (val << 1) | vp9_read(r, vp9_cat6_prob[11]); 168 val = (val << 1) | vp9_read(r, vp9_cat6_prob[12]); 169 val = (val << 1) | vp9_read(r, vp9_cat6_prob[13]); 170 val += CAT6_MIN_VAL; 171 172 WRITE_COEF_CONTINUE(val, CATEGORY6_TOKEN); 173 } 174 175 return c; 176} 177 178int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd, 179 int plane, int block, BLOCK_SIZE plane_bsize, 180 int x, int y, TX_SIZE tx_size, vp9_reader *r) { 181 struct macroblockd_plane *const pd = &xd->plane[plane]; 182 const int ctx = get_entropy_context(tx_size, pd->above_context + x, 183 pd->left_context + y); 184 const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block); 185 const int eob = decode_coefs(cm, xd, pd->plane_type, 186 BLOCK_OFFSET(pd->dqcoeff, block), tx_size, 187 pd->dequant, ctx, so->scan, so->neighbors, r); 188 vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y); 189 return eob; 190} 191 192 193