vp9/decoder/vp9_detokenize.c

   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 #if CONFIG_COEFFICIENT_RANGE_CHECKING
  18 #include "vp9/common/vp9_idct.h"
  19 #endif
  20 #include "vp9/common/vp9_scan.h"
  21
  22 #include "vp9/decoder/vp9_detokenize.h"
  23
  24 #define EOB_CONTEXT_NODE            0
  25 #define ZERO_CONTEXT_NODE           1
  26 #define ONE_CONTEXT_NODE            2
  27 #define LOW_VAL_CONTEXT_NODE        0
  28 #define TWO_CONTEXT_NODE            1
  29 #define THREE_CONTEXT_NODE          2
  30 #define HIGH_LOW_CONTEXT_NODE       3
  31 #define CAT_ONE_CONTEXT_NODE        4
  32 #define CAT_THREEFOUR_CONTEXT_NODE  5
  33 #define CAT_THREE_CONTEXT_NODE      6
  34 #define CAT_FIVE_CONTEXT_NODE       7
  35
  36 #define INCREMENT_COUNT(token)                              \
  37   do {                                                      \
  38      if (!cm->frame_parallel_decoding_mode)                 \
  39        ++coef_counts[band][ctx][token];                     \
  40   } while (0)
  41
  42 static INLINE int read_coeff(const vp9_prob *probs, int n, vp9_reader *r) {
  43   int i, val = 0;
  44   for (i = 0; i < n; ++i)
  45     val = (val << 1) | vp9_read(r, probs[i]);
  46   return val;
  47 }
  48
  49 static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd,
  50                         FRAME_COUNTS *counts, PLANE_TYPE type,
  51                         tran_low_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
  52                         int ctx, const int16_t *scan, const int16_t *nb,
  53                         vp9_reader *r) {
  54   const int max_eob = 16 << (tx_size << 1);
  55   const FRAME_CONTEXT *const fc = cm->fc;
  56   const int ref = is_inter_block(&xd->mi[0]->mbmi);
  57   int band, c = 0;
  58   const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
  59       fc->coef_probs[tx_size][type][ref];
  60   const vp9_prob *prob;
  61   unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
  62       counts->coef[tx_size][type][ref];
  63   unsigned int (*eob_branch_count)[COEFF_CONTEXTS] =
  64       counts->eob_branch[tx_size][type][ref];
  65   uint8_t token_cache[32 * 32];
  66   const uint8_t *band_translate = get_band_translate(tx_size);
  67   const int dq_shift = (tx_size == TX_32X32);
  68   int v, token;
  69   int16_t dqv = dq[0];
  70   const uint8_t *cat1_prob;
  71   const uint8_t *cat2_prob;
  72   const uint8_t *cat3_prob;
  73   const uint8_t *cat4_prob;
  74   const uint8_t *cat5_prob;
  75   const uint8_t *cat6_prob;
  76
  77 #if CONFIG_VP9_HIGHBITDEPTH
  78   if (cm->use_highbitdepth) {
  79     if (cm->bit_depth == VPX_BITS_10) {
  80       cat1_prob = vp9_cat1_prob_high10;
  81       cat2_prob = vp9_cat2_prob_high10;
  82       cat3_prob = vp9_cat3_prob_high10;
  83       cat4_prob = vp9_cat4_prob_high10;
  84       cat5_prob = vp9_cat5_prob_high10;
  85       cat6_prob = vp9_cat6_prob_high10;
  86     } else {
  87       cat1_prob = vp9_cat1_prob_high12;
  88       cat2_prob = vp9_cat2_prob_high12;
  89       cat3_prob = vp9_cat3_prob_high12;
  90       cat4_prob = vp9_cat4_prob_high12;
  91       cat5_prob = vp9_cat5_prob_high12;
  92       cat6_prob = vp9_cat6_prob_high12;
  93     }
  94   } else {
  95     cat1_prob = vp9_cat1_prob;
  96     cat2_prob = vp9_cat2_prob;
  97     cat3_prob = vp9_cat3_prob;
  98     cat4_prob = vp9_cat4_prob;
  99     cat5_prob = vp9_cat5_prob;
 100     cat6_prob = vp9_cat6_prob;
 101   }
 102 #else
 103   cat1_prob = vp9_cat1_prob;
 104   cat2_prob = vp9_cat2_prob;
 105   cat3_prob = vp9_cat3_prob;
 106   cat4_prob = vp9_cat4_prob;
 107   cat5_prob = vp9_cat5_prob;
 108   cat6_prob = vp9_cat6_prob;
 109 #endif
 110
 111   while (c < max_eob) {
 112     int val = -1;
 113     band = *band_translate++;
 114     prob = coef_probs[band][ctx];
 115     if (!cm->frame_parallel_decoding_mode)
 116       ++eob_branch_count[band][ctx];
 117     if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) {
 118       INCREMENT_COUNT(EOB_MODEL_TOKEN);
 119       break;
 120     }
 121
 122     while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
 123       INCREMENT_COUNT(ZERO_TOKEN);
 124       dqv = dq[1];
 125       token_cache[scan[c]] = 0;
 126       ++c;
 127       if (c >= max_eob)
 128         return c;  // zero tokens at the end (no eob token)
 129       ctx = get_coef_context(nb, token_cache, c);
 130       band = *band_translate++;
 131       prob = coef_probs[band][ctx];
 132     }
 133
 134     if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
 135       INCREMENT_COUNT(ONE_TOKEN);
 136       token = ONE_TOKEN;
 137       val = 1;
 138     } else {
 139       INCREMENT_COUNT(TWO_TOKEN);
 140       token = vp9_read_tree(r, vp9_coef_con_tree,
 141                             vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
 142       switch (token) {
 143         case TWO_TOKEN:
 144         case THREE_TOKEN:
 145         case FOUR_TOKEN:
 146           val = token;
 147           break;
 148         case CATEGORY1_TOKEN:
 149           val = CAT1_MIN_VAL + read_coeff(cat1_prob, 1, r);
 150           break;
 151         case CATEGORY2_TOKEN:
 152           val = CAT2_MIN_VAL + read_coeff(cat2_prob, 2, r);
 153           break;
 154         case CATEGORY3_TOKEN:
 155           val = CAT3_MIN_VAL + read_coeff(cat3_prob, 3, r);
 156           break;
 157         case CATEGORY4_TOKEN:
 158           val = CAT4_MIN_VAL + read_coeff(cat4_prob, 4, r);
 159           break;
 160         case CATEGORY5_TOKEN:
 161           val = CAT5_MIN_VAL + read_coeff(cat5_prob, 5, r);
 162           break;
 163         case CATEGORY6_TOKEN:
 164 #if CONFIG_VP9_HIGHBITDEPTH
 165           switch (cm->bit_depth) {
 166             case VPX_BITS_8:
 167               val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
 168               break;
 169             case VPX_BITS_10:
 170               val = CAT6_MIN_VAL + read_coeff(cat6_prob, 16, r);
 171               break;
 172             case VPX_BITS_12:
 173               val = CAT6_MIN_VAL + read_coeff(cat6_prob, 18, r);
 174               break;
 175             default:
 176               assert(0);
 177               return -1;
 178           }
 179 #else
 180           val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
 181 #endif
 182           break;
 183       }
 184     }
 185     v = (val * dqv) >> dq_shift;
 186 #if CONFIG_COEFFICIENT_RANGE_CHECKING
 187 #if CONFIG_VP9_HIGHBITDEPTH
 188     dqcoeff[scan[c]] = highbd_check_range((vp9_read_bit(r) ? -v : v),
 189                                           cm->bit_depth);
 190 #else
 191     dqcoeff[scan[c]] = check_range(vp9_read_bit(r) ? -v : v);
 192 #endif  // CONFIG_VP9_HIGHBITDEPTH
 193 #else
 194     dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v;
 195 #endif  // CONFIG_COEFFICIENT_RANGE_CHECKING
 196     token_cache[scan[c]] = vp9_pt_energy_class[token];
 197     ++c;
 198     ctx = get_coef_context(nb, token_cache, c);
 199     dqv = dq[1];
 200   }
 201
 202   return c;
 203 }
 204
 205 int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd,
 206                             FRAME_COUNTS *counts, int plane, int block,
 207                             BLOCK_SIZE plane_bsize, int x, int y,
 208                             TX_SIZE tx_size, vp9_reader *r,
 209                             int seg_id) {
 210   struct macroblockd_plane *const pd = &xd->plane[plane];
 211   const int16_t *const dequant = (plane == 0) ? cm->y_dequant[seg_id]
 212                                               : cm->uv_dequant[seg_id];
 213   const int ctx = get_entropy_context(tx_size, pd->above_context + x,
 214                                                pd->left_context + y);
 215   const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block);
 216   const int eob = decode_coefs(cm, xd, counts, pd->plane_type,
 217                                BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
 218                                dequant, ctx, so->scan, so->neighbors, r);
 219   vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
 220   return eob;
 221 }
 222
 223