vp9_detokenize.c 7.22 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */

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#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
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#include "vp9/common/vp9_blockd.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/common/vp9_entropy.h"
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
#include "vp9/common/vp9_idct.h"
#endif
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#include "vp9/common/vp9_scan.h"
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#include "vp9/decoder/vp9_detokenize.h"

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#define EOB_CONTEXT_NODE            0
#define ZERO_CONTEXT_NODE           1
#define ONE_CONTEXT_NODE            2
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#define LOW_VAL_CONTEXT_NODE        0
#define TWO_CONTEXT_NODE            1
#define THREE_CONTEXT_NODE          2
#define HIGH_LOW_CONTEXT_NODE       3
#define CAT_ONE_CONTEXT_NODE        4
#define CAT_THREEFOUR_CONTEXT_NODE  5
#define CAT_THREE_CONTEXT_NODE      6
#define CAT_FIVE_CONTEXT_NODE       7
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#define INCREMENT_COUNT(token)                              \
  do {                                                      \
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     if (counts)                                            \
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       ++coef_counts[band][ctx][token];                     \
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  } while (0)

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static INLINE int read_coeff(const vp9_prob *probs, int n, vp9_reader *r) {
  int i, val = 0;
  for (i = 0; i < n; ++i)
    val = (val << 1) | vp9_read(r, probs[i]);
  return val;
}
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static int decode_coefs(const MACROBLOCKD *xd,
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                        PLANE_TYPE type,
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                        tran_low_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
                        int ctx, const int16_t *scan, const int16_t *nb,
                        vp9_reader *r) {
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  FRAME_COUNTS *counts = xd->counts;
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  const int max_eob = 16 << (tx_size << 1);
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  const FRAME_CONTEXT *const fc = xd->fc;
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  const int ref = is_inter_block(&xd->mi[0]->mbmi);
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  int band, c = 0;
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  const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
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      fc->coef_probs[tx_size][type][ref];
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  const vp9_prob *prob;
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  unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
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      counts->coef[tx_size][type][ref];
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  unsigned int (*eob_branch_count)[COEFF_CONTEXTS] =
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      counts->eob_branch[tx_size][type][ref];
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  uint8_t token_cache[32 * 32];
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  const uint8_t *band_translate = get_band_translate(tx_size);
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  const int dq_shift = (tx_size == TX_32X32);
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  int v, token;
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  int16_t dqv = dq[0];
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  const uint8_t *cat1_prob;
  const uint8_t *cat2_prob;
  const uint8_t *cat3_prob;
  const uint8_t *cat4_prob;
  const uint8_t *cat5_prob;
  const uint8_t *cat6_prob;

#if CONFIG_VP9_HIGHBITDEPTH
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  if (xd->bd > VPX_BITS_8) {
    if (xd->bd == VPX_BITS_10) {
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      cat1_prob = vp9_cat1_prob_high10;
      cat2_prob = vp9_cat2_prob_high10;
      cat3_prob = vp9_cat3_prob_high10;
      cat4_prob = vp9_cat4_prob_high10;
      cat5_prob = vp9_cat5_prob_high10;
      cat6_prob = vp9_cat6_prob_high10;
    } else {
      cat1_prob = vp9_cat1_prob_high12;
      cat2_prob = vp9_cat2_prob_high12;
      cat3_prob = vp9_cat3_prob_high12;
      cat4_prob = vp9_cat4_prob_high12;
      cat5_prob = vp9_cat5_prob_high12;
      cat6_prob = vp9_cat6_prob_high12;
    }
  } else {
    cat1_prob = vp9_cat1_prob;
    cat2_prob = vp9_cat2_prob;
    cat3_prob = vp9_cat3_prob;
    cat4_prob = vp9_cat4_prob;
    cat5_prob = vp9_cat5_prob;
    cat6_prob = vp9_cat6_prob;
  }
#else
  cat1_prob = vp9_cat1_prob;
  cat2_prob = vp9_cat2_prob;
  cat3_prob = vp9_cat3_prob;
  cat4_prob = vp9_cat4_prob;
  cat5_prob = vp9_cat5_prob;
  cat6_prob = vp9_cat6_prob;
#endif
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  while (c < max_eob) {
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    int val = -1;
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    band = *band_translate++;
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    prob = coef_probs[band][ctx];
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    if (counts)
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      ++eob_branch_count[band][ctx];
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    if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) {
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      INCREMENT_COUNT(EOB_MODEL_TOKEN);
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      break;
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    }
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    while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
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      INCREMENT_COUNT(ZERO_TOKEN);
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      dqv = dq[1];
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      token_cache[scan[c]] = 0;
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      ++c;
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      if (c >= max_eob)
        return c;  // zero tokens at the end (no eob token)
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      ctx = get_coef_context(nb, token_cache, c);
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      band = *band_translate++;
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      prob = coef_probs[band][ctx];
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    }

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    if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
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      INCREMENT_COUNT(ONE_TOKEN);
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      token = ONE_TOKEN;
      val = 1;
    } else {
      INCREMENT_COUNT(TWO_TOKEN);
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      token = vp9_read_tree(r, vp9_coef_con_tree,
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                            vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
      switch (token) {
        case TWO_TOKEN:
        case THREE_TOKEN:
        case FOUR_TOKEN:
          val = token;
          break;
        case CATEGORY1_TOKEN:
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          val = CAT1_MIN_VAL + read_coeff(cat1_prob, 1, r);
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          break;
        case CATEGORY2_TOKEN:
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          val = CAT2_MIN_VAL + read_coeff(cat2_prob, 2, r);
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          break;
        case CATEGORY3_TOKEN:
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          val = CAT3_MIN_VAL + read_coeff(cat3_prob, 3, r);
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          break;
        case CATEGORY4_TOKEN:
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          val = CAT4_MIN_VAL + read_coeff(cat4_prob, 4, r);
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          break;
        case CATEGORY5_TOKEN:
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          val = CAT5_MIN_VAL + read_coeff(cat5_prob, 5, r);
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          break;
        case CATEGORY6_TOKEN:
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#if CONFIG_VP9_HIGHBITDEPTH
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          switch (xd->bd) {
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            case VPX_BITS_8:
              val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
              break;
            case VPX_BITS_10:
              val = CAT6_MIN_VAL + read_coeff(cat6_prob, 16, r);
              break;
            case VPX_BITS_12:
              val = CAT6_MIN_VAL + read_coeff(cat6_prob, 18, r);
              break;
            default:
              assert(0);
              return -1;
          }
#else
          val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r);
#endif
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          break;
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      }
    }
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    v = (val * dqv) >> dq_shift;
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
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#if CONFIG_VP9_HIGHBITDEPTH
    dqcoeff[scan[c]] = highbd_check_range((vp9_read_bit(r) ? -v : v),
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                                          xd->bd);
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#else
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    dqcoeff[scan[c]] = check_range(vp9_read_bit(r) ? -v : v);
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#endif  // CONFIG_VP9_HIGHBITDEPTH
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#else
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    dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v;
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#endif  // CONFIG_COEFFICIENT_RANGE_CHECKING
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    token_cache[scan[c]] = vp9_pt_energy_class[token];
    ++c;
    ctx = get_coef_context(nb, token_cache, c);
    dqv = dq[1];
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  }
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  return c;
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}
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int vp9_decode_block_tokens(MACROBLOCKD *xd,
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                            int plane, int block,
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                            BLOCK_SIZE plane_bsize, int x, int y,
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                            TX_SIZE tx_size, vp9_reader *r,
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                            int seg_id) {
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  struct macroblockd_plane *const pd = &xd->plane[plane];
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  const int16_t *const dequant = pd->seg_dequant[seg_id];
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  const int ctx = get_entropy_context(tx_size, pd->above_context + x,
                                               pd->left_context + y);
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  const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block);
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  const int eob = decode_coefs(xd, pd->plane_type,
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                               BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
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                               dequant, ctx, so->scan, so->neighbors, r);
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  vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
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  return eob;
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}

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