vp9_detokenize.c 21.3 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 "vp9/common/vp9_blockd.h"
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#include "vp9/decoder/vp9_onyxd_int.h"
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#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
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#include "vp9/decoder/vp9_detokenize.h"
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#include "vp9/common/vp9_seg_common.h"
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#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

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#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

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static const vp9_prob cat6_prob[15] = {
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  254, 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0
};
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DECLARE_ALIGNED(16, extern const uint8_t, vp9_norm[256]);
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static int get_signed(BOOL_DECODER *br, int value_to_sign) {
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  return decode_bool(br, 128) ? -value_to_sign : value_to_sign;
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}
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#define INCREMENT_COUNT(token)               \
  do {                                       \
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    coef_counts[type][ref][get_coef_band(scan, txfm_size, c)] \
               [pt][token]++;     \
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    token_cache[c] = token; \
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    pt = vp9_get_coef_context(scan, nb, pad, token_cache,     \
                              c, default_eob); \
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  } while (0)

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#if CONFIG_CODE_NONZEROCOUNT
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#define WRITE_COEF_CONTINUE(val, token)                       \
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  {                                                           \
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    qcoeff_ptr[scan[c]] = (int16_t) get_signed(br, val);      \
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    INCREMENT_COUNT(token);                                   \
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    c++;                                                      \
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    nzc++;                                           \
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    continue;                                                 \
  }
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#else
#define WRITE_COEF_CONTINUE(val, token)                       \
  {                                                           \
    qcoeff_ptr[scan[c]] = (int16_t) get_signed(br, val);      \
    INCREMENT_COUNT(token);                                   \
    c++;                                                      \
    continue;                                                 \
  }
#endif  // CONFIG_CODE_NONZEROCOUNT
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#define ADJUST_COEF(prob, bits_count)  \
  do {                                 \
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    if (vp9_read(br, prob))            \
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      val += (uint16_t)(1 << bits_count);\
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  } while (0);
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static int decode_coefs(VP9D_COMP *dx, const MACROBLOCKD *xd,
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                        BOOL_DECODER* const br, int block_idx,
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                        PLANE_TYPE type, int seg_eob, int16_t *qcoeff_ptr,
                        TX_SIZE txfm_size) {
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  ENTROPY_CONTEXT* const A0 = (ENTROPY_CONTEXT *) xd->above_context;
  ENTROPY_CONTEXT* const L0 = (ENTROPY_CONTEXT *) xd->left_context;
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  int aidx, lidx;
  ENTROPY_CONTEXT above_ec, left_ec;
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  FRAME_CONTEXT *const fc = &dx->common.fc;
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  int pt, c = 0, pad, default_eob;
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  vp9_coeff_probs *coef_probs;
  vp9_prob *prob;
  vp9_coeff_count *coef_counts;
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  const int ref = xd->mode_info_context->mbmi.ref_frame != INTRA_FRAME;
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#if CONFIG_CODE_NONZEROCOUNT
  uint16_t nzc = 0;
  uint16_t nzc_expected = xd->mode_info_context->mbmi.nzcs[block_idx];
#endif
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  const int *scan, *nb;
  uint8_t token_cache[1024];
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  if (xd->mode_info_context->mbmi.sb_type == BLOCK_SIZE_SB64X64) {
    aidx = vp9_block2above_sb64[txfm_size][block_idx];
    lidx = vp9_block2left_sb64[txfm_size][block_idx];
  } else if (xd->mode_info_context->mbmi.sb_type == BLOCK_SIZE_SB32X32) {
    aidx = vp9_block2above_sb[txfm_size][block_idx];
    lidx = vp9_block2left_sb[txfm_size][block_idx];
  } else {
    aidx = vp9_block2above[txfm_size][block_idx];
    lidx = vp9_block2left[txfm_size][block_idx];
  }

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  switch (txfm_size) {
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    default:
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    case TX_4X4: {
      const TX_TYPE tx_type = get_tx_type_4x4(xd, block_idx);
      switch (tx_type) {
        default:
          scan = vp9_default_zig_zag1d_4x4;
          break;
        case ADST_DCT:
          scan = vp9_row_scan_4x4;
          break;
        case DCT_ADST:
          scan = vp9_col_scan_4x4;
          break;
      }
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      above_ec = A0[aidx] != 0;
      left_ec = L0[lidx] != 0;
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      coef_probs  = fc->coef_probs_4x4;
      coef_counts = fc->coef_counts_4x4;
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      default_eob = 16;
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      break;
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    }
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    case TX_8X8:
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      scan = vp9_default_zig_zag1d_8x8;
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      coef_probs  = fc->coef_probs_8x8;
      coef_counts = fc->coef_counts_8x8;
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      above_ec = (A0[aidx] + A0[aidx + 1]) != 0;
      left_ec  = (L0[lidx] + L0[lidx + 1]) != 0;
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      default_eob = 64;
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      break;
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    case TX_16X16:
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      scan = vp9_default_zig_zag1d_16x16;
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      coef_probs  = fc->coef_probs_16x16;
      coef_counts = fc->coef_counts_16x16;
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      if (type == PLANE_TYPE_UV) {
        ENTROPY_CONTEXT *A1 = (ENTROPY_CONTEXT *) (xd->above_context + 1);
        ENTROPY_CONTEXT *L1 = (ENTROPY_CONTEXT *) (xd->left_context + 1);
        above_ec = (A0[aidx] + A0[aidx + 1] + A1[aidx] + A1[aidx + 1]) != 0;
        left_ec  = (L0[lidx] + L0[lidx + 1] + L1[lidx] + L1[lidx + 1]) != 0;
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      } else {
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        above_ec = (A0[aidx] + A0[aidx + 1] + A0[aidx + 2] + A0[aidx + 3]) != 0;
        left_ec  = (L0[lidx] + L0[lidx + 1] + L0[lidx + 2] + L0[lidx + 3]) != 0;
      }
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      default_eob = 256;
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      break;
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    case TX_32X32:
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      scan = vp9_default_zig_zag1d_32x32;
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      coef_probs = fc->coef_probs_32x32;
      coef_counts = fc->coef_counts_32x32;
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      if (type == PLANE_TYPE_UV) {
        ENTROPY_CONTEXT *A1 = (ENTROPY_CONTEXT *) (xd->above_context + 1);
        ENTROPY_CONTEXT *L1 = (ENTROPY_CONTEXT *) (xd->left_context + 1);
        ENTROPY_CONTEXT *A2 = (ENTROPY_CONTEXT *) (xd->above_context + 2);
        ENTROPY_CONTEXT *L2 = (ENTROPY_CONTEXT *) (xd->left_context + 2);
        ENTROPY_CONTEXT *A3 = (ENTROPY_CONTEXT *) (xd->above_context + 3);
        ENTROPY_CONTEXT *L3 = (ENTROPY_CONTEXT *) (xd->left_context + 3);
        above_ec = (A0[aidx] + A0[aidx + 1] + A1[aidx] + A1[aidx + 1] +
                    A2[aidx] + A2[aidx + 1] + A3[aidx] + A3[aidx + 1]) != 0;
        left_ec  = (L0[lidx] + L0[lidx + 1] + L1[lidx] + L1[lidx + 1] +
                    L2[lidx] + L2[lidx + 1] + L3[lidx] + L3[lidx + 1]) != 0;
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      } else {
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        ENTROPY_CONTEXT *A1 = (ENTROPY_CONTEXT *) (xd->above_context + 1);
        ENTROPY_CONTEXT *L1 = (ENTROPY_CONTEXT *) (xd->left_context + 1);
        above_ec = (A0[aidx] + A0[aidx + 1] + A0[aidx + 2] + A0[aidx + 3] +
                    A1[aidx] + A1[aidx + 1] + A1[aidx + 2] + A1[aidx + 3]) != 0;
        left_ec  = (L0[lidx] + L0[lidx + 1] + L0[lidx + 2] + L0[lidx + 3] +
                    L1[lidx] + L1[lidx + 1] + L1[lidx + 2] + L1[lidx + 3]) != 0;
      }
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      default_eob = 1024;
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      break;
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  }
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  VP9_COMBINEENTROPYCONTEXTS(pt, above_ec, left_ec);
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  nb = vp9_get_coef_neighbors_handle(scan, &pad);

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  while (1) {
    int val;
    const uint8_t *cat6 = cat6_prob;
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    if (c >= seg_eob)
      break;
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#if CONFIG_CODE_NONZEROCOUNT
    if (nzc == nzc_expected)
      break;
#endif
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    prob = coef_probs[type][ref][get_coef_band(scan, txfm_size, c)][pt];
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#if CONFIG_CODE_NONZEROCOUNT == 0
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    fc->eob_branch_counts[txfm_size][type][ref]
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                         [get_coef_band(scan, txfm_size, c)][pt]++;
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    if (!vp9_read(br, prob[EOB_CONTEXT_NODE]))
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      break;
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#endif
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SKIP_START:
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    if (c >= seg_eob)
      break;
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#if CONFIG_CODE_NONZEROCOUNT
    if (nzc == nzc_expected)
      break;
    // decode zero node only if there are zeros left
    if (seg_eob - nzc_expected - c + nzc > 0)
#endif
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    if (!vp9_read(br, prob[ZERO_CONTEXT_NODE])) {
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      INCREMENT_COUNT(ZERO_TOKEN);
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      ++c;
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      prob = coef_probs[type][ref][get_coef_band(scan, txfm_size, c)][pt];
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      goto SKIP_START;
    }
    // ONE_CONTEXT_NODE_0_
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    if (!vp9_read(br, prob[ONE_CONTEXT_NODE])) {
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      WRITE_COEF_CONTINUE(1, ONE_TOKEN);
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    }
    // LOW_VAL_CONTEXT_NODE_0_
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    if (!vp9_read(br, prob[LOW_VAL_CONTEXT_NODE])) {
      if (!vp9_read(br, prob[TWO_CONTEXT_NODE])) {
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        WRITE_COEF_CONTINUE(2, TWO_TOKEN);
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      }
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      if (!vp9_read(br, prob[THREE_CONTEXT_NODE])) {
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        WRITE_COEF_CONTINUE(3, THREE_TOKEN);
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      }
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      WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
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    }
    // HIGH_LOW_CONTEXT_NODE_0_
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    if (!vp9_read(br, prob[HIGH_LOW_CONTEXT_NODE])) {
      if (!vp9_read(br, prob[CAT_ONE_CONTEXT_NODE])) {
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        val = CAT1_MIN_VAL;
        ADJUST_COEF(CAT1_PROB0, 0);
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        WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY1);
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      }
      val = CAT2_MIN_VAL;
      ADJUST_COEF(CAT2_PROB1, 1);
      ADJUST_COEF(CAT2_PROB0, 0);
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      WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY2);
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    }
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    // CAT_THREEFOUR_CONTEXT_NODE_0_
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    if (!vp9_read(br, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
      if (!vp9_read(br, prob[CAT_THREE_CONTEXT_NODE])) {
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        val = CAT3_MIN_VAL;
        ADJUST_COEF(CAT3_PROB2, 2);
        ADJUST_COEF(CAT3_PROB1, 1);
        ADJUST_COEF(CAT3_PROB0, 0);
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        WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY3);
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      }
      val = CAT4_MIN_VAL;
      ADJUST_COEF(CAT4_PROB3, 3);
      ADJUST_COEF(CAT4_PROB2, 2);
      ADJUST_COEF(CAT4_PROB1, 1);
      ADJUST_COEF(CAT4_PROB0, 0);
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      WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY4);
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    }
    // CAT_FIVE_CONTEXT_NODE_0_:
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    if (!vp9_read(br, prob[CAT_FIVE_CONTEXT_NODE])) {
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      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);
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      WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY5);
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    }
    val = 0;
    while (*cat6) {
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      val = (val << 1) | vp9_read(br, *cat6++);
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    }
    val += CAT6_MIN_VAL;
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    WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY6);
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  }
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#if CONFIG_CODE_NONZEROCOUNT == 0
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  if (c < seg_eob)
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    coef_counts[type][ref][get_coef_band(scan, txfm_size, c)]
               [pt][DCT_EOB_TOKEN]++;
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#endif
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  A0[aidx] = L0[lidx] = c > 0;
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  if (txfm_size >= TX_8X8) {
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    A0[aidx + 1] = L0[lidx + 1] = A0[aidx];
    if (txfm_size >= TX_16X16) {
      if (type == PLANE_TYPE_UV) {
        ENTROPY_CONTEXT *A1 = (ENTROPY_CONTEXT *) (xd->above_context + 1);
        ENTROPY_CONTEXT *L1 = (ENTROPY_CONTEXT *) (xd->left_context + 1);
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        A1[aidx] = A1[aidx + 1] = L1[lidx] = L1[lidx + 1] = A0[aidx];
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        if (txfm_size >= TX_32X32) {
          ENTROPY_CONTEXT *A2 = (ENTROPY_CONTEXT *) (xd->above_context + 2);
          ENTROPY_CONTEXT *L2 = (ENTROPY_CONTEXT *) (xd->left_context + 2);
          ENTROPY_CONTEXT *A3 = (ENTROPY_CONTEXT *) (xd->above_context + 3);
          ENTROPY_CONTEXT *L3 = (ENTROPY_CONTEXT *) (xd->left_context + 3);
          A2[aidx] = A2[aidx + 1] = A3[aidx] = A3[aidx + 1] = A0[aidx];
          L2[lidx] = L2[lidx + 1] = L3[lidx] = L3[lidx + 1] = A0[aidx];
        }
      } else {
        A0[aidx + 2] = A0[aidx + 3] = L0[lidx + 2] = L0[lidx + 3] = A0[aidx];
        if (txfm_size >= TX_32X32) {
          ENTROPY_CONTEXT *A1 = (ENTROPY_CONTEXT *) (xd->above_context + 1);
          ENTROPY_CONTEXT *L1 = (ENTROPY_CONTEXT *) (xd->left_context + 1);
          A1[aidx] = A1[aidx + 1] = A1[aidx + 2] = A1[aidx + 3] = A0[aidx];
          L1[lidx] = L1[lidx + 1] = L1[lidx + 2] = L1[lidx + 3] = A0[aidx];
        }
      }
    }
  }
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  return c;
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}
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static int get_eob(MACROBLOCKD* const xd, int segment_id, int eob_max) {
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  return vp9_get_segdata(xd, segment_id, SEG_LVL_SKIP) ? 0 : eob_max;
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}

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int vp9_decode_sb_tokens(VP9D_COMP* const pbi,
                         MACROBLOCKD* const xd,
                         BOOL_DECODER* const bc) {
  const int segment_id = xd->mode_info_context->mbmi.segment_id;
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  int i, eobtotal = 0, seg_eob, c;
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  switch (xd->mode_info_context->mbmi.txfm_size) {
    case TX_32X32:
      // Luma block
      c = decode_coefs(pbi, xd, bc, 0, PLANE_TYPE_Y_WITH_DC,
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                       get_eob(xd, segment_id, 1024), xd->qcoeff, TX_32X32);
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      xd->eobs[0] = c;
      eobtotal += c;

      // 16x16 chroma blocks
      seg_eob = get_eob(xd, segment_id, 256);
      for (i = 64; i < 96; i += 16) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_16X16);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_16X16:
      // 16x16 luma blocks
      seg_eob = get_eob(xd, segment_id, 256);
      for (i = 0; i < 64; i += 16) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_16X16);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 16x16 chroma blocks
      for (i = 64; i < 96; i += 16) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_16X16);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_8X8:
      // 8x8 luma blocks
      seg_eob = get_eob(xd, segment_id, 64);
      for (i = 0; i < 64; i += 4) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_8X8);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 8x8 chroma blocks
      for (i = 64; i < 96; i += 4) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_8X8);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_4X4:
      // 4x4 luma blocks
      seg_eob = get_eob(xd, segment_id, 16);
      for (i = 0; i < 64; i++) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_4X4);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 4x4 chroma blocks
      for (i = 64; i < 96; i++) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_4X4);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    default: assert(0);
  }

  return eobtotal;
}

int vp9_decode_sb64_tokens(VP9D_COMP* const pbi,
                           MACROBLOCKD* const xd,
                           BOOL_DECODER* const bc) {
  const int segment_id = xd->mode_info_context->mbmi.segment_id;
  int i, eobtotal = 0, seg_eob, c;

  switch (xd->mode_info_context->mbmi.txfm_size) {
    case TX_32X32:
      // Luma block
      seg_eob = get_eob(xd, segment_id, 1024);
      for (i = 0; i < 256; i += 64) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_32X32);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 32x32 chroma blocks
      for (i = 256; i < 384; i += 64) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_32X32);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_16X16:
      // 16x16 luma blocks
      seg_eob = get_eob(xd, segment_id, 256);
      for (i = 0; i < 256; i += 16) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_16X16);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 16x16 chroma blocks
      for (i = 256; i < 384; i += 16) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_16X16);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_8X8:
      // 8x8 luma blocks
      seg_eob = get_eob(xd, segment_id, 64);
      for (i = 0; i < 256; i += 4) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_8X8);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 8x8 chroma blocks
      for (i = 256; i < 384; i += 4) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_8X8);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    case TX_4X4:
      // 4x4 luma blocks
      seg_eob = get_eob(xd, segment_id, 16);
      for (i = 0; i < 256; i++) {
        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                         seg_eob, xd->qcoeff + i * 16, TX_4X4);
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        xd->eobs[i] = c;
        eobtotal += c;
      }

      // 4x4 chroma blocks
      for (i = 256; i < 384; i++) {
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        c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV, seg_eob,
                         xd->qcoeff + i * 16, TX_4X4);
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        xd->eobs[i] = c;
        eobtotal += c;
      }
      break;
    default: assert(0);
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  }
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  return eobtotal;
}
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static int vp9_decode_mb_tokens_16x16(VP9D_COMP* const pbi,
                                      MACROBLOCKD* const xd,
                                      BOOL_DECODER* const bc) {
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  const int segment_id = xd->mode_info_context->mbmi.segment_id;
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  int i, eobtotal = 0, seg_eob;
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  // Luma block
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  int c = decode_coefs(pbi, xd, bc, 0, PLANE_TYPE_Y_WITH_DC,
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                       get_eob(xd, segment_id, 256), xd->qcoeff, TX_16X16);
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  xd->eobs[0] = c;
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  eobtotal += c;
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  // 8x8 chroma blocks
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  seg_eob = get_eob(xd, segment_id, 64);
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  for (i = 16; i < 24; i += 4) {
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    c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV,
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                     seg_eob, xd->block[i].qcoeff, TX_8X8);
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    xd->eobs[i] = c;
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    eobtotal += c;
  }
  return eobtotal;
}

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static int vp9_decode_mb_tokens_8x8(VP9D_COMP* const pbi,
                                    MACROBLOCKD* const xd,
                                    BOOL_DECODER* const bc) {
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  int c, i, eobtotal = 0, seg_eob;
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  const int segment_id = xd->mode_info_context->mbmi.segment_id;
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  // luma blocks
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  seg_eob = get_eob(xd, segment_id, 64);
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  for (i = 0; i < 16; i += 4) {
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    c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_Y_WITH_DC,
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                     seg_eob, xd->block[i].qcoeff, TX_8X8);
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    xd->eobs[i] = c;
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    eobtotal += c;
  }

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  // chroma blocks
  if (xd->mode_info_context->mbmi.mode == I8X8_PRED ||
      xd->mode_info_context->mbmi.mode == SPLITMV) {
    // use 4x4 transform for U, V components in I8X8/splitmv prediction mode
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    seg_eob = get_eob(xd, segment_id, 16);
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    for (i = 16; i < 24; i++) {
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      c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV,
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                       seg_eob, xd->block[i].qcoeff, TX_4X4);
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      xd->eobs[i] = c;
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      eobtotal += c;
    }
  } else {
    for (i = 16; i < 24; i += 4) {
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      c = decode_coefs(pbi, xd, bc, i, PLANE_TYPE_UV,
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                       seg_eob, xd->block[i].qcoeff, TX_8X8);
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      xd->eobs[i] = c;
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      eobtotal += c;
    }
  }

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  return eobtotal;
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}

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static int decode_coefs_4x4(VP9D_COMP *dx, MACROBLOCKD *xd,
                            BOOL_DECODER* const bc,
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                            PLANE_TYPE type, int i, int seg_eob) {
  int c = decode_coefs(dx, xd, bc, i, type, seg_eob,
                       xd->block[i].qcoeff, TX_4X4);
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  xd->eobs[i] = c;
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  return c;
}

int vp9_decode_coefs_4x4(VP9D_COMP *dx, MACROBLOCKD *xd,
                         BOOL_DECODER* const bc,
                         PLANE_TYPE type, int i) {
  const int segment_id = xd->mode_info_context->mbmi.segment_id;
  const int seg_eob = get_eob(xd, segment_id, 16);

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  return decode_coefs_4x4(dx, xd, bc, type, i, seg_eob);
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}

static int decode_mb_tokens_4x4_uv(VP9D_COMP* const dx,
                                   MACROBLOCKD* const xd,
                                   BOOL_DECODER* const bc,
                                   int seg_eob) {
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  int eobtotal = 0, i;

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  // chroma blocks
  for (i = 16; i < 24; i++) {
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    eobtotal += decode_coefs_4x4(dx, xd, bc, PLANE_TYPE_UV, i, seg_eob);
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  }
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  return eobtotal;
}

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int vp9_decode_mb_tokens_4x4_uv(VP9D_COMP* const dx,
                                MACROBLOCKD* const xd,
                                BOOL_DECODER* const bc) {
  const int segment_id = xd->mode_info_context->mbmi.segment_id;
  const int seg_eob = get_eob(xd, segment_id, 16);

  return decode_mb_tokens_4x4_uv(dx, xd, bc, seg_eob);
}

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static int vp9_decode_mb_tokens_4x4(VP9D_COMP* const dx,
                                    MACROBLOCKD* const xd,
                                    BOOL_DECODER* const bc) {
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  int i, eobtotal = 0;
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  const int segment_id = xd->mode_info_context->mbmi.segment_id;
  const int seg_eob = get_eob(xd, segment_id, 16);
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  // luma blocks
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  for (i = 0; i < 16; ++i) {
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    eobtotal += decode_coefs_4x4(dx, xd, bc, PLANE_TYPE_Y_WITH_DC, i, seg_eob);
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  }
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  // chroma blocks
  eobtotal += decode_mb_tokens_4x4_uv(dx, xd, bc, seg_eob);

  return eobtotal;
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}
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int vp9_decode_mb_tokens(VP9D_COMP* const dx,
                         MACROBLOCKD* const xd,
                         BOOL_DECODER* const bc) {
  const TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;
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  switch (tx_size) {
    case TX_16X16:
      return vp9_decode_mb_tokens_16x16(dx, xd, bc);
    case TX_8X8:
      return vp9_decode_mb_tokens_8x8(dx, xd, bc);
    default:
      assert(tx_size == TX_4X4);
      return vp9_decode_mb_tokens_4x4(dx, xd, bc);
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  }
}