text: /*
   *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #include "vpx_mem/vpx_mem.h"
  #include "vpx_ports/mem.h"
  
  #include "vp9/common/vp9_blockd.h"
  #include "vp9/common/vp9_common.h"
  #include "vp9/common/vp9_seg_common.h"
  
  #include "vp9/decoder/vp9_dboolhuff.h"
  #include "vp9/decoder/vp9_detokenize.h"
  #include "vp9/decoder/vp9_onyxd_int.h"
  #include "vp9/decoder/vp9_treereader.h"
  
  #define EOB_CONTEXT_NODE            0
  #define ZERO_CONTEXT_NODE           1
  #define ONE_CONTEXT_NODE            2
  #define LOW_VAL_CONTEXT_NODE        3
  #define TWO_CONTEXT_NODE            4
  #define THREE_CONTEXT_NODE          5
  #define HIGH_LOW_CONTEXT_NODE       6
  #define CAT_ONE_CONTEXT_NODE        7
  #define CAT_THREEFOUR_CONTEXT_NODE  8
  #define CAT_THREE_CONTEXT_NODE      9
  #define CAT_FIVE_CONTEXT_NODE       10
  
  #define CAT1_MIN_VAL    5
  #define CAT2_MIN_VAL    7
  #define CAT3_MIN_VAL   11
  #define CAT4_MIN_VAL   19
  #define CAT5_MIN_VAL   35
  #define CAT6_MIN_VAL   67
  #define CAT1_PROB0    159
  #define CAT2_PROB0    145
  #define CAT2_PROB1    165
  
  #define CAT3_PROB0 140
  #define CAT3_PROB1 148
  #define CAT3_PROB2 173
  
  #define CAT4_PROB0 135
  #define CAT4_PROB1 140
  #define CAT4_PROB2 155
  #define CAT4_PROB3 176
  
  #define CAT5_PROB0 130
  #define CAT5_PROB1 134
  #define CAT5_PROB2 141
  #define CAT5_PROB3 157
  #define CAT5_PROB4 180
  
  static const vp9_prob cat6_prob[15] = {
    254, 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0
  };
  
  DECLARE_ALIGNED(16, extern const uint8_t,
                  vp9_pt_energy_class[MAX_ENTROPY_TOKENS]);
  #define INCREMENT_COUNT(token)               \
    do {                                       \
      coef_counts[type][ref][band][pt]         \
                 [token >= TWO_TOKEN ?     \
                  (token == DCT_EOB_TOKEN ? DCT_EOB_MODEL_TOKEN : TWO_TOKEN) : \
                  token]++;     \
      token_cache[scan[c]] = vp9_pt_energy_class[token]; \
    } while (0)
  
  #define WRITE_COEF_CONTINUE(val, token)                  \
    {                                                      \
      qcoeff_ptr[scan[c]] = vp9_read_and_apply_sign(r, val) * \
                              dq[c > 0] / (1 + (tx_size == TX_32X32)); \
      INCREMENT_COUNT(token);                              \
      c++;                                                 \
      continue;                                            \
    }
  
  #define ADJUST_COEF(prob, bits_count)  \
    do {                                 \
      if (vp9_read(r, prob))             \
        val += 1 << bits_count;          \
    } while (0);
  
  static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd,
                          vp9_reader *r, int block_idx,
                          PLANE_TYPE type, int seg_eob, int16_t *qcoeff_ptr,
                          TX_SIZE tx_size, const int16_t *dq,
                          ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L) {
    FRAME_CONTEXT *const fc = &cm->fc;
    FRAME_COUNTS *const counts = &cm->counts;
    const int ref = is_inter_block(&xd->this_mi->mbmi);
    int band, c = 0;
    vp9_prob (*coef_probs)[PREV_COEF_CONTEXTS][UNCONSTRAINED_NODES] =
        fc->coef_probs[tx_size][type][ref];
    vp9_prob coef_probs_full[COEF_BANDS][PREV_COEF_CONTEXTS][ENTROPY_NODES];
    uint8_t load_map[COEF_BANDS][PREV_COEF_CONTEXTS] = { { 0 } };
    vp9_prob *prob;
    vp9_coeff_count_model *coef_counts = counts->coef[tx_size];
    const int16_t *scan, *nb;
    const uint8_t *band_translate;
    uint8_t token_cache[1024];
    int pt = get_entropy_context(xd, tx_size, type, block_idx, A, L,
                                 &scan, &band_translate);
    nb = vp9_get_coef_neighbors_handle(scan);
  
    while (1) {
      int val;
      const uint8_t *cat6 = cat6_prob;
      if (c >= seg_eob)
        break;
      if (c)
        pt = get_coef_context(nb, token_cache, c);
      band = get_coef_band(band_translate, c);
      prob = coef_probs[band][pt];
      counts->eob_branch[tx_size][type][ref][band][pt]++;
      if (!vp9_read(r, prob[EOB_CONTEXT_NODE]))
        break;
  
  SKIP_START:
      if (c >= seg_eob)
        break;
      if (c)
        pt = get_coef_context(nb, token_cache, c);
      band = get_coef_band(band_translate, c);
      prob = coef_probs[band][pt];
  
      if (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
        INCREMENT_COUNT(ZERO_TOKEN);
        ++c;
        goto SKIP_START;
      }
  
      // ONE_CONTEXT_NODE_0_
      if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
        WRITE_COEF_CONTINUE(1, ONE_TOKEN);
      }
      // Load full probabilities if not already loaded
      if (!load_map[band][pt]) {
        vp9_model_to_full_probs(coef_probs[band][pt],
                                coef_probs_full[band][pt]);
        load_map[band][pt] = 1;
      }
      prob = coef_probs_full[band][pt];
      // LOW_VAL_CONTEXT_NODE_0_
      if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) {
        if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) {
          WRITE_COEF_CONTINUE(2, TWO_TOKEN);
        }
        if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) {
          WRITE_COEF_CONTINUE(3, THREE_TOKEN);
        }
        WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
      }
      // HIGH_LOW_CONTEXT_NODE_0_
      if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) {
        if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) {
          val = CAT1_MIN_VAL;
          ADJUST_COEF(CAT1_PROB0, 0);
          WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY1);
        }
        val = CAT2_MIN_VAL;
        ADJUST_COEF(CAT2_PROB1, 1);
        ADJUST_COEF(CAT2_PROB0, 0);
        WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY2);
      }
      // CAT_THREEFOUR_CONTEXT_NODE_0_
      if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
        if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) {
          val = CAT3_MIN_VAL;
          ADJUST_COEF(CAT3_PROB2, 2);
          ADJUST_COEF(CAT3_PROB1, 1);
          ADJUST_COEF(CAT3_PROB0, 0);
          WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY3);
        }
        val = CAT4_MIN_VAL;
        ADJUST_COEF(CAT4_PROB3, 3);
        ADJUST_COEF(CAT4_PROB2, 2);
        ADJUST_COEF(CAT4_PROB1, 1);
        ADJUST_COEF(CAT4_PROB0, 0);
        WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY4);
      }
      // CAT_FIVE_CONTEXT_NODE_0_:
      if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) {
        val = CAT5_MIN_VAL;
        ADJUST_COEF(CAT5_PROB4, 4);
        ADJUST_COEF(CAT5_PROB3, 3);
        ADJUST_COEF(CAT5_PROB2, 2);
        ADJUST_COEF(CAT5_PROB1, 1);
        ADJUST_COEF(CAT5_PROB0, 0);
        WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY5);
      }
      val = 0;
      while (*cat6) {
        val = (val << 1) | vp9_read(r, *cat6++);
      }
      val += CAT6_MIN_VAL;
      WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY6);
    }
  
    if (c < seg_eob)
      coef_counts[type][ref][band][pt][DCT_EOB_MODEL_TOKEN]++;
  
  
    return c;
  }
  
  struct decode_block_args {
    VP9D_COMP *pbi;
    vp9_reader *r;
    int *eobtotal;
  };
  
  static void decode_block(int plane, int block, BLOCK_SIZE plane_bsize,
                           TX_SIZE tx_size, void *argv) {
    const struct decode_block_args* const arg = argv;
  
    // find the maximum eob for this transform size, adjusted by segment
    MACROBLOCKD *xd = &arg->pbi->mb;
    struct segmentation *seg = &arg->pbi->common.seg;
    struct macroblockd_plane* pd = &xd->plane[plane];
    const int segment_id = xd->this_mi->mbmi.segment_id;
    const int seg_eob = get_tx_eob(seg, segment_id, tx_size);
    int aoff, loff, eob;
  
    txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &aoff, &loff);
  
    eob = decode_coefs(&arg->pbi->common, xd, arg->r, block,
                       pd->plane_type, seg_eob, BLOCK_OFFSET(pd->qcoeff, block),
                       tx_size, pd->dequant,
                       pd->above_context + aoff, pd->left_context + loff);
  
    set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, aoff, loff);
  
    pd->eobs[block] = eob;
    *arg->eobtotal += eob;
  }
  
  int vp9_decode_tokens(VP9D_COMP *pbi, vp9_reader *r, BLOCK_SIZE bsize) {
    int eobtotal = 0;
    struct decode_block_args args = {pbi, r, &eobtotal};
    foreach_transformed_block(&pbi->mb, bsize, decode_block, &args);
    return eobtotal;
  }
  