bitstream.c 83.1 KB
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/*
 *  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 <assert.h>
#include <stdio.h>
#include <limits.h>

#include "vpx/vpx_encoder.h"
#include "vpx_dsp/bitwriter_buffer.h"
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#include "vpx_dsp/vpx_dsp_common.h"
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#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem_ops.h"
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#include "vpx_ports/system_state.h"
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#include "vp10/common/entropy.h"
#include "vp10/common/entropymode.h"
#include "vp10/common/entropymv.h"
#include "vp10/common/mvref_common.h"
#include "vp10/common/pred_common.h"
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#include "vp10/common/reconinter.h"
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#include "vp10/common/seg_common.h"
#include "vp10/common/tile_common.h"
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#include "vp10/encoder/cost.h"
#include "vp10/encoder/bitstream.h"
#include "vp10/encoder/encodemv.h"
#include "vp10/encoder/mcomp.h"
#include "vp10/encoder/segmentation.h"
#include "vp10/encoder/subexp.h"
#include "vp10/encoder/tokenize.h"
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static const struct vp10_token intra_mode_encodings[INTRA_MODES] = {
  {0, 1}, {6, 3}, {28, 5}, {30, 5}, {58, 6}, {59, 6}, {126, 7}, {127, 7},
  {62, 6}, {2, 2}};
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#if CONFIG_EXT_INTERP && SWITCHABLE_FILTERS == 4
static const struct vp10_token switchable_interp_encodings[SWITCHABLE_FILTERS] =
  {{0, 1}, {4, 3}, {3, 2}, {5, 3}};
#else
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static const struct vp10_token switchable_interp_encodings[SWITCHABLE_FILTERS] =
  {{0, 1}, {2, 2}, {3, 2}};
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#endif  // CONFIG_EXT_INTERP && SWITCHABLE_FILTERS == 4
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static const struct vp10_token partition_encodings[PARTITION_TYPES] =
  {{0, 1}, {2, 2}, {6, 3}, {7, 3}};
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#if !CONFIG_REF_MV
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static const struct vp10_token inter_mode_encodings[INTER_MODES] =
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#if CONFIG_EXT_INTER
  {{2, 2}, {6, 3}, {0, 1}, {14, 4}, {15, 4}};
#else
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  {{2, 2}, {6, 3}, {0, 1}, {7, 3}};
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#endif  // CONFIG_EXT_INTER
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#endif
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#if CONFIG_EXT_INTER
static const struct vp10_token inter_compound_mode_encodings
                               [INTER_COMPOUND_MODES] = {
  {2, 2}, {24, 5}, {25, 5}, {52, 6}, {53, 6},
  {54, 6}, {55, 6}, {0, 1}, {7, 3}
};
#endif  // CONFIG_EXT_INTER
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static const struct vp10_token palette_size_encodings[] = {
    {0, 1}, {2, 2}, {6, 3}, {14, 4}, {30, 5}, {62, 6}, {63, 6},
};
static const struct vp10_token
palette_color_encodings[PALETTE_MAX_SIZE - 1][PALETTE_MAX_SIZE] = {
    {{0, 1}, {1, 1}},  // 2 colors
    {{0, 1}, {2, 2}, {3, 2}},  // 3 colors
    {{0, 1}, {2, 2}, {6, 3}, {7, 3}},  // 4 colors
    {{0, 1}, {2, 2}, {6, 3}, {14, 4}, {15, 4}},  // 5 colors
    {{0, 1}, {2, 2}, {6, 3}, {14, 4}, {30, 5}, {31, 5}},  // 6 colors
    {{0, 1}, {2, 2}, {6, 3}, {14, 4}, {30, 5}, {62, 6}, {63, 6}},  // 7 colors
    {{0, 1}, {2, 2}, {6, 3}, {14, 4},
        {30, 5}, {62, 6}, {126, 7}, {127, 7}},  // 8 colors
};
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static INLINE void write_uniform(vpx_writer *w, int n, int v) {
  int l = get_unsigned_bits(n);
  int m = (1 << l) - n;
  if (l == 0)
    return;
  if (v < m) {
    vpx_write_literal(w, v, l - 1);
  } else {
    vpx_write_literal(w, m + ((v - m) >> 1), l - 1);
    vpx_write_literal(w, (v - m) & 1, 1);
  }
}
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#if CONFIG_EXT_TX
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static struct vp10_token ext_tx_inter_encodings[EXT_TX_SETS_INTER][TX_TYPES];
static struct vp10_token ext_tx_intra_encodings[EXT_TX_SETS_INTRA][TX_TYPES];
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#else
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static struct vp10_token ext_tx_encodings[TX_TYPES];
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#endif  // CONFIG_EXT_TX

void vp10_encode_token_init() {
#if CONFIG_EXT_TX
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  int s;
  for (s = 1; s < EXT_TX_SETS_INTER; ++s) {
    vp10_tokens_from_tree(ext_tx_inter_encodings[s], vp10_ext_tx_inter_tree[s]);
  }
  for (s = 1; s < EXT_TX_SETS_INTRA; ++s) {
    vp10_tokens_from_tree(ext_tx_intra_encodings[s], vp10_ext_tx_intra_tree[s]);
  }
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#else
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  vp10_tokens_from_tree(ext_tx_encodings, vp10_ext_tx_tree);
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#endif  // CONFIG_EXT_TX
}

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#if CONFIG_SUPERTX
static int vp10_check_supertx(VP10_COMMON *cm, int mi_row, int mi_col,
                              BLOCK_SIZE bsize) {
  MODE_INFO *mi;
  mi = cm->mi + (mi_row * cm->mi_stride + mi_col);
  return mi[0].mbmi.tx_size == max_txsize_lookup[bsize] &&
         mi[0].mbmi.sb_type < bsize;
}
#endif  // CONFIG_SUPERTX

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static void write_intra_mode(vpx_writer *w, PREDICTION_MODE mode,
                             const vpx_prob *probs) {
  vp10_write_token(w, vp10_intra_mode_tree, probs, &intra_mode_encodings[mode]);
}

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static void write_inter_mode(VP10_COMMON *cm,
                             vpx_writer *w, PREDICTION_MODE mode,
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#if CONFIG_REF_MV && CONFIG_EXT_INTER
                             int is_compound,
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
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                             const int16_t mode_ctx) {
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#if CONFIG_REF_MV
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  const int16_t newmv_ctx = mode_ctx & NEWMV_CTX_MASK;
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  const vpx_prob newmv_prob = cm->fc->newmv_prob[newmv_ctx];
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#if CONFIG_EXT_INTER
  vpx_write(w, mode != NEWMV && mode != NEWFROMNEARMV, newmv_prob);

  if (!is_compound && (mode == NEWMV || mode == NEWFROMNEARMV))
    vpx_write(w, mode == NEWFROMNEARMV, cm->fc->new2mv_prob);

  if (mode != NEWMV && mode != NEWFROMNEARMV) {
#else
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  vpx_write(w, mode != NEWMV, newmv_prob);

  if (mode != NEWMV) {
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#endif  // CONFIG_EXT_INTER
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    const int16_t zeromv_ctx = (mode_ctx >> ZEROMV_OFFSET) & ZEROMV_CTX_MASK;
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    const vpx_prob zeromv_prob = cm->fc->zeromv_prob[zeromv_ctx];
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    if (mode_ctx & (1 << ALL_ZERO_FLAG_OFFSET)) {
      assert(mode == ZEROMV);
      return;
    }

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    vpx_write(w, mode != ZEROMV, zeromv_prob);

    if (mode != ZEROMV) {
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      int16_t refmv_ctx = (mode_ctx >> REFMV_OFFSET) & REFMV_CTX_MASK;
      vpx_prob refmv_prob;

      if (mode_ctx & (1 << SKIP_NEARESTMV_OFFSET))
        refmv_ctx = 6;
      if (mode_ctx & (1 << SKIP_NEARMV_OFFSET))
        refmv_ctx = 7;
      if (mode_ctx & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET))
        refmv_ctx = 8;

      refmv_prob = cm->fc->refmv_prob[refmv_ctx];
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      vpx_write(w, mode != NEARESTMV, refmv_prob);
    }
  }
#else
  const vpx_prob *const inter_probs = cm->fc->inter_mode_probs[mode_ctx];
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  assert(is_inter_mode(mode));
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  vp10_write_token(w, vp10_inter_mode_tree, inter_probs,
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                  &inter_mode_encodings[INTER_OFFSET(mode)]);
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#endif
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}

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#if CONFIG_EXT_INTER
static void write_inter_compound_mode(VP10_COMMON *cm, vpx_writer *w,
                                      PREDICTION_MODE mode,
                                      const int16_t mode_ctx) {
  const vpx_prob *const inter_compound_probs =
                        cm->fc->inter_compound_mode_probs[mode_ctx];

  assert(is_inter_compound_mode(mode));
  vp10_write_token(w, vp10_inter_compound_mode_tree, inter_compound_probs,
                  &inter_compound_mode_encodings[INTER_COMPOUND_OFFSET(mode)]);
}
#endif  // CONFIG_EXT_INTER

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static void encode_unsigned_max(struct vpx_write_bit_buffer *wb,
                                int data, int max) {
  vpx_wb_write_literal(wb, data, get_unsigned_bits(max));
}

static void prob_diff_update(const vpx_tree_index *tree,
                             vpx_prob probs[/*n - 1*/],
                             const unsigned int counts[/*n - 1*/],
                             int n, vpx_writer *w) {
  int i;
  unsigned int branch_ct[32][2];

  // Assuming max number of probabilities <= 32
  assert(n <= 32);

  vp10_tree_probs_from_distribution(tree, branch_ct, counts);
  for (i = 0; i < n - 1; ++i)
    vp10_cond_prob_diff_update(w, &probs[i], branch_ct[i]);
}

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static int prob_diff_update_savings(const vpx_tree_index *tree,
                                    vpx_prob probs[/*n - 1*/],
                                    const unsigned int counts[/*n - 1*/],
                                    int n) {
  int i;
  unsigned int branch_ct[32][2];
  int savings = 0;

  // Assuming max number of probabilities <= 32
  assert(n <= 32);
  vp10_tree_probs_from_distribution(tree, branch_ct, counts);
  for (i = 0; i < n - 1; ++i) {
    savings += vp10_cond_prob_diff_update_savings(&probs[i],
                                                  branch_ct[i]);
  }
  return savings;
}

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#if CONFIG_VAR_TX
static void write_tx_size_inter(const VP10_COMMON *cm,
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                                const MACROBLOCKD *xd,
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                                const MB_MODE_INFO *mbmi,
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                                TX_SIZE tx_size, int blk_row, int blk_col,
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                                vpx_writer *w) {
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  const int tx_idx = (blk_row >> 1) * 8 + (blk_col >> 1);
  int max_blocks_high = num_4x4_blocks_high_lookup[mbmi->sb_type];
  int max_blocks_wide = num_4x4_blocks_wide_lookup[mbmi->sb_type];
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  int ctx = txfm_partition_context(xd->above_txfm_context + (blk_col >> 1),
                                   xd->left_txfm_context + (blk_row >> 1),
                                   tx_size);

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  if (xd->mb_to_bottom_edge < 0)
    max_blocks_high += xd->mb_to_bottom_edge >> 5;
  if (xd->mb_to_right_edge < 0)
     max_blocks_wide += xd->mb_to_right_edge >> 5;

  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide)
     return;

  if (tx_size == mbmi->inter_tx_size[tx_idx]) {
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    vpx_write(w, 0, cm->fc->txfm_partition_prob[ctx]);
    txfm_partition_update(xd->above_txfm_context + (blk_col >> 1),
                          xd->left_txfm_context + (blk_row >> 1), tx_size);
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  } else {
    const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
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    int bsl = b_width_log2_lookup[bsize];
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    int i;
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    vpx_write(w, 1, cm->fc->txfm_partition_prob[ctx]);
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    if (tx_size == TX_8X8) {
      txfm_partition_update(xd->above_txfm_context + (blk_col >> 1),
                            xd->left_txfm_context + (blk_row >> 1), TX_4X4);
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      return;
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    }
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    assert(bsl > 0);
    --bsl;
    for (i = 0; i < 4; ++i) {
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      int offsetr = blk_row + ((i >> 1) << bsl);
      int offsetc = blk_col + ((i & 0x01) << bsl);
      write_tx_size_inter(cm, xd, mbmi, tx_size - 1, offsetr, offsetc, w);
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    }
  }
}
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static void update_txfm_partition_probs(VP10_COMMON *cm, vpx_writer *w,
                                        FRAME_COUNTS *counts) {
  int k;
  for (k = 0; k < TXFM_PARTITION_CONTEXTS; ++k)
    vp10_cond_prob_diff_update(w, &cm->fc->txfm_partition_prob[k],
                               counts->txfm_partition[k]);
}
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#endif

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static void write_selected_tx_size(const VP10_COMMON *cm,
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                                   const MACROBLOCKD *xd, vpx_writer *w) {
  TX_SIZE tx_size = xd->mi[0]->mbmi.tx_size;
  BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
  const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
  const vpx_prob *const tx_probs = get_tx_probs2(max_tx_size, xd,
                                                 &cm->fc->tx_probs);
  vpx_write(w, tx_size != TX_4X4, tx_probs[0]);
  if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {
    vpx_write(w, tx_size != TX_8X8, tx_probs[1]);
    if (tx_size != TX_8X8 && max_tx_size >= TX_32X32)
      vpx_write(w, tx_size != TX_16X16, tx_probs[2]);
  }
}

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#if CONFIG_REF_MV
static void update_inter_mode_probs(VP10_COMMON *cm, vpx_writer *w,
                                    FRAME_COUNTS *counts) {
  int i;
  for (i = 0; i < NEWMV_MODE_CONTEXTS; ++i)
    vp10_cond_prob_diff_update(w, &cm->fc->newmv_prob[i],
                               counts->newmv_mode[i]);
  for (i = 0; i < ZEROMV_MODE_CONTEXTS; ++i)
    vp10_cond_prob_diff_update(w, &cm->fc->zeromv_prob[i],
                               counts->zeromv_mode[i]);
  for (i = 0; i < REFMV_MODE_CONTEXTS; ++i)
    vp10_cond_prob_diff_update(w, &cm->fc->refmv_prob[i],
                               counts->refmv_mode[i]);
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#if CONFIG_EXT_INTER
  vp10_cond_prob_diff_update(w, &cm->fc->new2mv_prob, counts->new2mv_mode);
#endif  // CONFIG_EXT_INTER
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}
#endif

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#if CONFIG_EXT_INTER
static void update_inter_compound_mode_probs(VP10_COMMON *cm, vpx_writer *w) {
  const int savings_thresh = vp10_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             vp10_cost_zero(GROUP_DIFF_UPDATE_PROB);
  int i;
  int savings = 0;
  int do_update = 0;
  for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
    savings += prob_diff_update_savings(vp10_inter_compound_mode_tree,
                                        cm->fc->inter_compound_mode_probs[i],
                                        cm->counts.inter_compound_mode[i],
                                        INTER_COMPOUND_MODES);
  }
  do_update = savings > savings_thresh;
  vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
  if (do_update) {
    for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
      prob_diff_update(vp10_inter_compound_mode_tree,
                       cm->fc->inter_compound_mode_probs[i],
                       cm->counts.inter_compound_mode[i],
                       INTER_COMPOUND_MODES, w);
    }
  }
}
#endif  // CONFIG_EXT_INTER

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static int write_skip(const VP10_COMMON *cm, const MACROBLOCKD *xd,
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                      int segment_id, const MODE_INFO *mi, vpx_writer *w) {
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
    return 1;
  } else {
    const int skip = mi->mbmi.skip;
    vpx_write(w, skip, vp10_get_skip_prob(cm, xd));
    return skip;
  }
}

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static void update_skip_probs(VP10_COMMON *cm, vpx_writer *w,
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                              FRAME_COUNTS *counts) {
  int k;

  for (k = 0; k < SKIP_CONTEXTS; ++k)
    vp10_cond_prob_diff_update(w, &cm->fc->skip_probs[k], counts->skip[k]);
}

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static void update_switchable_interp_probs(VP10_COMMON *cm, vpx_writer *w,
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                                           FRAME_COUNTS *counts) {
  int j;
  for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)
    prob_diff_update(vp10_switchable_interp_tree,
                     cm->fc->switchable_interp_prob[j],
                     counts->switchable_interp[j], SWITCHABLE_FILTERS, w);
}

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#if CONFIG_EXT_TX
static void update_ext_tx_probs(VP10_COMMON *cm, vpx_writer *w) {
  const int savings_thresh = vp10_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             vp10_cost_zero(GROUP_DIFF_UPDATE_PROB);
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  int i, j;
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  int s;
  for (s = 1; s < EXT_TX_SETS_INTER; ++s) {
    int savings = 0;
    int do_update = 0;
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
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      if (!use_inter_ext_tx_for_txsize[s][i]) continue;
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      savings += prob_diff_update_savings(
          vp10_ext_tx_inter_tree[s], cm->fc->inter_ext_tx_prob[s][i],
          cm->counts.inter_ext_tx[s][i], num_ext_tx_set_inter[s]);
    }
    do_update = savings > savings_thresh;
    vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
    if (do_update) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
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        if (!use_inter_ext_tx_for_txsize[s][i]) continue;
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        prob_diff_update(vp10_ext_tx_inter_tree[s],
                         cm->fc->inter_ext_tx_prob[s][i],
                         cm->counts.inter_ext_tx[s][i],
                         num_ext_tx_set_inter[s], w);
      }
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    }
  }
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  for (s = 1; s < EXT_TX_SETS_INTRA; ++s) {
    int savings = 0;
    int do_update = 0;
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
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      if (!use_intra_ext_tx_for_txsize[s][i]) continue;
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      for (j = 0; j < INTRA_MODES; ++j)
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        savings += prob_diff_update_savings(
            vp10_ext_tx_intra_tree[s], cm->fc->intra_ext_tx_prob[s][i][j],
            cm->counts.intra_ext_tx[s][i][j], num_ext_tx_set_intra[s]);
    }
    do_update = savings > savings_thresh;
    vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
    if (do_update) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
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        if (!use_intra_ext_tx_for_txsize[s][i]) continue;
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        for (j = 0; j < INTRA_MODES; ++j)
          prob_diff_update(vp10_ext_tx_intra_tree[s],
                           cm->fc->intra_ext_tx_prob[s][i][j],
                           cm->counts.intra_ext_tx[s][i][j],
                           num_ext_tx_set_intra[s], w);
      }
    }
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  }
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}
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#else
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static void update_ext_tx_probs(VP10_COMMON *cm, vpx_writer *w) {
  const int savings_thresh = vp10_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             vp10_cost_zero(GROUP_DIFF_UPDATE_PROB);
  int i, j;

  int savings = 0;
  int do_update = 0;
  for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
    for (j = 0; j < TX_TYPES; ++j)
      savings += prob_diff_update_savings(
          vp10_ext_tx_tree, cm->fc->intra_ext_tx_prob[i][j],
          cm->counts.intra_ext_tx[i][j], TX_TYPES);
  }
  do_update = savings > savings_thresh;
  vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
  if (do_update) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
      for (j = 0; j < TX_TYPES; ++j)
        prob_diff_update(vp10_ext_tx_tree,
                         cm->fc->intra_ext_tx_prob[i][j],
                         cm->counts.intra_ext_tx[i][j],
                         TX_TYPES, w);
    }
  }
  savings = 0;
  do_update = 0;
  for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
    savings += prob_diff_update_savings(
        vp10_ext_tx_tree, cm->fc->inter_ext_tx_prob[i],
        cm->counts.inter_ext_tx[i], TX_TYPES);
  }
  do_update = savings > savings_thresh;
  vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
  if (do_update) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
      prob_diff_update(vp10_ext_tx_tree,
                       cm->fc->inter_ext_tx_prob[i],
                       cm->counts.inter_ext_tx[i],
                       TX_TYPES, w);
    }
  }
}
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#endif  // CONFIG_EXT_TX

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static void pack_palette_tokens(vpx_writer *w, TOKENEXTRA **tp,
                                BLOCK_SIZE bsize, int n) {
  int rows = 4 * num_4x4_blocks_high_lookup[bsize];
  int cols = 4 * num_4x4_blocks_wide_lookup[bsize];
  int i;
  TOKENEXTRA *p = *tp;

  for (i = 0; i < rows * cols -1; ++i) {
    vp10_write_token(w, vp10_palette_color_tree[n - 2], p->context_tree,
                     &palette_color_encodings[n - 2][p->token]);
    ++p;
  }

  *tp = p;
}

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#if CONFIG_SUPERTX
static void update_supertx_probs(VP10_COMMON *cm, vpx_writer *w) {
  const int savings_thresh = vp10_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             vp10_cost_zero(GROUP_DIFF_UPDATE_PROB);
  int i, j;
  int savings = 0;
  int do_update = 0;
  for (i = 0; i < PARTITION_SUPERTX_CONTEXTS; ++i) {
    for (j = 1; j < TX_SIZES; ++j) {
      savings += vp10_cond_prob_diff_update_savings(&cm->fc->supertx_prob[i][j],
                                                    cm->counts.supertx[i][j]);
    }
  }
  do_update = savings > savings_thresh;
  vpx_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
  if (do_update) {
    for (i = 0; i < PARTITION_SUPERTX_CONTEXTS; ++i) {
      for (j = 1; j < TX_SIZES; ++j) {
        vp10_cond_prob_diff_update(w, &cm->fc->supertx_prob[i][j],
                                   cm->counts.supertx[i][j]);
      }
    }
  }
}
#endif  // CONFIG_SUPERTX

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#if !CONFIG_ANS
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static void pack_mb_tokens(vpx_writer *w,
                           TOKENEXTRA **tp, const TOKENEXTRA *const stop,
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                           vpx_bit_depth_t bit_depth, const TX_SIZE tx) {
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  TOKENEXTRA *p = *tp;
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#if CONFIG_VAR_TX
  int count = 0;
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  const int seg_eob = 16 << (tx << 1);
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#endif
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  while (p < stop && p->token != EOSB_TOKEN) {
    const int t = p->token;
    const struct vp10_token *const a = &vp10_coef_encodings[t];
    int v = a->value;
    int n = a->len;
#if CONFIG_VP9_HIGHBITDEPTH
    const vp10_extra_bit *b;
    if (bit_depth == VPX_BITS_12)
      b = &vp10_extra_bits_high12[t];
    else if (bit_depth == VPX_BITS_10)
      b = &vp10_extra_bits_high10[t];
    else
      b = &vp10_extra_bits[t];
#else
    const vp10_extra_bit *const b = &vp10_extra_bits[t];
    (void) bit_depth;
#endif  // CONFIG_VP9_HIGHBITDEPTH

    /* skip one or two nodes */
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    if (p->skip_eob_node)
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      n -= p->skip_eob_node;
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    else
      vpx_write(w, t != EOB_TOKEN, p->context_tree[0]);

    if (t != EOB_TOKEN) {
      vpx_write(w, t != ZERO_TOKEN, p->context_tree[1]);
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      if (t != ZERO_TOKEN) {
        vpx_write(w, t != ONE_TOKEN, p->context_tree[2]);

        if (t != ONE_TOKEN) {
          int len = UNCONSTRAINED_NODES - p->skip_eob_node;
          vp10_write_tree(w, vp10_coef_con_tree,
                          vp10_pareto8_full[p->context_tree[PIVOT_NODE] - 1],
                          v, n - len, 0);
        }
      }
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    }

    if (b->base_val) {
      const int e = p->extra, l = b->len;
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      int skip_bits =
          (b->base_val == CAT6_MIN_VAL) ? TX_SIZES - 1 - tx : 0;
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      if (l) {
        const unsigned char *pb = b->prob;
        int v = e >> 1;
        int n = l;              /* number of bits in v, assumed nonzero */
        int i = 0;

        do {
          const int bb = (v >> --n) & 1;
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          if (skip_bits) {
            skip_bits--;
            assert(!bb);
          } else {
            vpx_write(w, bb, pb[i >> 1]);
          }
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          i = b->tree[i + bb];
        } while (n);
      }

      vpx_write_bit(w, e & 1);
    }
    ++p;
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#if CONFIG_VAR_TX
    ++count;
    if (t == EOB_TOKEN || count == seg_eob)
      break;
#endif
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  }

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  *tp = p;
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}
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#else
// This function serializes the tokens backwards both in token order and
// bit order in each token.
static void pack_mb_tokens_ans(struct AnsCoder *const ans,
                               const TOKENEXTRA *const start,
                               const TOKENEXTRA *const stop,
                               vpx_bit_depth_t bit_depth) {
  const TOKENEXTRA *p;
  TX_SIZE tx_size = TX_SIZES;

  for (p = stop - 1; p >= start; --p) {
    const int t = p->token;
    if (t == EOSB_TOKEN) {
      tx_size = (TX_SIZE)p->extra;
    } else {
#if CONFIG_VP9_HIGHBITDEPTH
    const vp10_extra_bit *const b =
      (bit_depth == VPX_BITS_12) ? &vp10_extra_bits_high12[t] :
      (bit_depth == VPX_BITS_10) ? &vp10_extra_bits_high10[t] :
      &vp10_extra_bits[t];
#else
    const vp10_extra_bit *const b = &vp10_extra_bits[t];
    (void) bit_depth;
#endif  // CONFIG_VP9_HIGHBITDEPTH

    if (t != EOB_TOKEN && t != ZERO_TOKEN) {
      // Write extra bits first
      const int e = p->extra;
      const int l = b->len;
      const int skip_bits = (t == CATEGORY6_TOKEN) ? TX_SIZES - 1 - tx_size : 0;
      assert(tx_size < TX_SIZES);
      uabs_write(ans, e & 1, 128);
      if (l) {
        const int v = e >> 1;
        int n;
        for (n = 0; n < l - skip_bits; ++n) {
          const int bb = (v >> n) & 1;
          uabs_write(ans, bb, b->prob[l - 1 - n]);
        }
        for (; n < l; ++n) {
          assert(((v >> n) & 1) == 0);
        }
      }

      {
        struct rans_sym s;
        int j;
        const vpx_prob *token_probs =
            vp10_pareto8_token_probs[p->context_tree[PIVOT_NODE] - 1];
        s.cum_prob = 0;
        for (j = ONE_TOKEN; j < t; ++j) {
          s.cum_prob += token_probs[j - ONE_TOKEN];
        }
        s.prob = token_probs[t - ONE_TOKEN];
        rans_write(ans, &s);
      }
    }
    if (t != EOB_TOKEN)
      uabs_write(ans, t != ZERO_TOKEN, p->context_tree[1]);
    if (!p->skip_eob_node)
      uabs_write(ans, t != EOB_TOKEN, p->context_tree[0]);
  }
  }
}
#endif  // !CONFIG_ANS
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#if CONFIG_VAR_TX
static void pack_txb_tokens(vpx_writer *w,
                           TOKENEXTRA **tp, const TOKENEXTRA *const tok_end,
                           MACROBLOCKD *xd, MB_MODE_INFO *mbmi, int plane,
                           BLOCK_SIZE plane_bsize,
                           vpx_bit_depth_t bit_depth,
                           int block,
                           int blk_row, int blk_col, TX_SIZE tx_size) {
  const struct macroblockd_plane *const pd = &xd->plane[plane];
  const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
  int tx_idx = (blk_row >> (1 - pd->subsampling_y)) * 8 +
               (blk_col >> (1 - pd->subsampling_x));
  TX_SIZE plane_tx_size = plane ?
      get_uv_tx_size_impl(mbmi->inter_tx_size[tx_idx], bsize, 0, 0) :
      mbmi->inter_tx_size[tx_idx];
  int max_blocks_high = num_4x4_blocks_high_lookup[plane_bsize];
  int max_blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize];

  if (xd->mb_to_bottom_edge < 0)
    max_blocks_high += xd->mb_to_bottom_edge >> (5 + pd->subsampling_y);
  if (xd->mb_to_right_edge < 0)
    max_blocks_wide += xd->mb_to_right_edge >> (5 + pd->subsampling_x);

  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide)
    return;

  if (tx_size == plane_tx_size) {
    pack_mb_tokens(w, tp, tok_end, bit_depth, tx_size);
  } else {
    int bsl = b_width_log2_lookup[bsize];
    int i;

    assert(bsl > 0);
    --bsl;

    for (i = 0; i < 4; ++i) {
      const int offsetr = blk_row + ((i >> 1) << bsl);
      const int offsetc = blk_col + ((i & 0x01) << bsl);
      int step = 1 << (2 * (tx_size - 1));

      if (offsetr >= max_blocks_high || offsetc >= max_blocks_wide)
        continue;

      pack_txb_tokens(w, tp, tok_end, xd, mbmi, plane,
                      plane_bsize, bit_depth, block + i * step,
                      offsetr, offsetc, tx_size - 1);
    }
  }
}
#endif

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static void write_segment_id(vpx_writer *w, const struct segmentation *seg,
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                             const struct segmentation_probs *segp,
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                             int segment_id) {
  if (seg->enabled && seg->update_map)
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    vp10_write_tree(w, vp10_segment_tree, segp->tree_probs, segment_id, 3, 0);
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}

// This function encodes the reference frame
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static void write_ref_frames(const VP10_COMMON *cm, const MACROBLOCKD *xd,
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                             vpx_writer *w) {
  const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const int is_compound = has_second_ref(mbmi);
  const int segment_id = mbmi->segment_id;

  // If segment level coding of this signal is disabled...
  // or the segment allows multiple reference frame options
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    assert(!is_compound);
    assert(mbmi->ref_frame[0] ==
               get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME));
  } else {
    // does the feature use compound prediction or not
    // (if not specified at the frame/segment level)
    if (cm->reference_mode == REFERENCE_MODE_SELECT) {
      vpx_write(w, is_compound, vp10_get_reference_mode_prob(cm, xd));
    } else {
      assert(!is_compound == (cm->reference_mode == SINGLE_REFERENCE));
    }

    if (is_compound) {
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#if CONFIG_EXT_REFS
      const int bit = (mbmi->ref_frame[0] == GOLDEN_FRAME ||
                       mbmi->ref_frame[0] == LAST3_FRAME ||
                       mbmi->ref_frame[0] == LAST4_FRAME);
#else
      const int bit = mbmi->ref_frame[0] == GOLDEN_FRAME;
#endif  // CONFIG_EXT_REFS
      vpx_write(w, bit, vp10_get_pred_prob_comp_ref_p(cm, xd));

#if CONFIG_EXT_REFS
      if (!bit) {
        const int bit1 = mbmi->ref_frame[0] == LAST_FRAME;
        vpx_write(w, bit1, vp10_get_pred_prob_comp_ref_p1(cm, xd));
      } else {
        const int bit2 = mbmi->ref_frame[0] == GOLDEN_FRAME;
        vpx_write(w, bit2, vp10_get_pred_prob_comp_ref_p2(cm, xd));
        if (!bit2) {
          const int bit3 = mbmi->ref_frame[0] == LAST3_FRAME;
          vpx_write(w, bit3, vp10_get_pred_prob_comp_ref_p3(cm, xd));
        }
      }
#endif  // CONFIG_EXT_REFS
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    } else {
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#if CONFIG_EXT_REFS
      const int bit0 = (mbmi->ref_frame[0] == GOLDEN_FRAME ||
                        mbmi->ref_frame[0] == ALTREF_FRAME);
      vpx_write(w, bit0, vp10_get_pred_prob_single_ref_p1(cm, xd));

      if (bit0) {
        const int bit1 = mbmi->ref_frame[0] != GOLDEN_FRAME;
        vpx_write(w, bit1, vp10_get_pred_prob_single_ref_p2(cm, xd));
      } else {
        const int bit2 = (mbmi->ref_frame[0] == LAST3_FRAME ||
                          mbmi->ref_frame[0] == LAST4_FRAME);
        vpx_write(w, bit2, vp10_get_pred_prob_single_ref_p3(cm, xd));

        if (!bit2) {
          const int bit3 = mbmi->ref_frame[0] != LAST_FRAME;
          vpx_write(w, bit3, vp10_get_pred_prob_single_ref_p4(cm, xd));
        } else {
          const int bit4 = mbmi->ref_frame[0] != LAST3_FRAME;
          vpx_write(w, bit4, vp10_get_pred_prob_single_ref_p5(cm, xd));
        }
      }
#else
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      const int bit0 = mbmi->ref_frame[0] != LAST_FRAME;
      vpx_write(w, bit0, vp10_get_pred_prob_single_ref_p1(cm, xd));
      if (bit0) {
        const int bit1 = mbmi->ref_frame[0] != GOLDEN_FRAME;
        vpx_write(w, bit1, vp10_get_pred_prob_single_ref_p2(cm, xd));
      }
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#endif  // CONFIG_EXT_REFS
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    }
  }
}

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#if CONFIG_EXT_INTRA
static void write_ext_intra_mode_info(const VP10_COMMON *const cm,
                                      const MB_MODE_INFO *const mbmi,
                                      vpx_writer *w) {
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#if !ALLOW_FILTER_INTRA_MODES
  return;
#endif
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  if (mbmi->mode == DC_PRED) {
    vpx_write(w, mbmi->ext_intra_mode_info.use_ext_intra_mode[0],
              cm->fc->ext_intra_probs[0]);
    if (mbmi->ext_intra_mode_info.use_ext_intra_mode[0]) {
      EXT_INTRA_MODE mode = mbmi->ext_intra_mode_info.ext_intra_mode[0];
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      write_uniform(w, FILTER_INTRA_MODES, mode);
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    }
  }
  if (mbmi->uv_mode == DC_PRED) {
    vpx_write(w, mbmi->ext_intra_mode_info.use_ext_intra_mode[1],
              cm->fc->ext_intra_probs[1]);
    if (mbmi->ext_intra_mode_info.use_ext_intra_mode[1]) {
      EXT_INTRA_MODE mode = mbmi->ext_intra_mode_info.ext_intra_mode[1];
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      write_uniform(w, FILTER_INTRA_MODES, mode);
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    }
  }
}
#endif  // CONFIG_EXT_INTRA

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static void write_switchable_interp_filter(VP10_COMP *cpi,
                                           const MACROBLOCKD *xd,
                                           vpx_writer *w) {
  VP10_COMMON *const cm = &cpi->common;
  const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  if (cm->interp_filter == SWITCHABLE) {
    const int ctx = vp10_get_pred_context_switchable_interp(xd);
#if CONFIG_EXT_INTERP
    if (!vp10_is_interp_needed(xd)) {
      assert(mbmi->interp_filter == EIGHTTAP);
      return;
    }
#endif
    vp10_write_token(w, vp10_switchable_interp_tree,
                     cm->fc->switchable_interp_prob[ctx],
                     &switchable_interp_encodings[mbmi->interp_filter]);
    ++cpi->interp_filter_selected[0][mbmi->interp_filter];
  }
}

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static void pack_inter_mode_mvs(VP10_COMP *cpi, const MODE_INFO *mi,
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#if CONFIG_SUPERTX
                                int supertx_enabled,
#endif
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                                vpx_writer *w) {
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  VP10_COMMON *const cm = &cpi->common;
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  const nmv_context *nmvc = &cm->fc->nmvc;
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  const MACROBLOCK *x = &cpi->td.mb;
  const MACROBLOCKD *xd = &x->e_mbd;
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  const struct segmentation *const seg = &cm->seg;
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  const struct segmentation_probs *const segp = &cm->fc->seg;
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  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MB_MODE_INFO_EXT *const mbmi_ext = x->mbmi_ext;
  const PREDICTION_MODE mode = mbmi->mode;
  const int segment_id = mbmi->segment_id;
  const BLOCK_SIZE bsize = mbmi->sb_type;
  const int allow_hp = cm->allow_high_precision_mv;
  const int is_inter = is_inter_block(mbmi);
  const int is_compound = has_second_ref(mbmi);
  int skip, ref;

  if (seg->update_map) {
    if (seg->temporal_update) {
      const int pred_flag = mbmi->seg_id_predicted;
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      vpx_prob pred_prob = vp10_get_pred_prob_seg_id(segp, xd);
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      vpx_write(w, pred_flag, pred_prob);
      if (!pred_flag)
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        write_segment_id(w, seg, segp, segment_id);
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    } else {
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      write_segment_id(w, seg, segp, segment_id);
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    }
  }

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#if CONFIG_SUPERTX
  if (supertx_enabled)
    skip = mbmi->skip;
  else
    skip = write_skip(cm, xd, segment_id, mi, w);
#else
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  skip = write_skip(cm, xd, segment_id, mi, w);
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#endif  // CONFIG_SUPERTX
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#if CONFIG_SUPERTX
  if (!supertx_enabled)
#endif  // CONFIG_SUPERTX
    if (!segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME))
      vpx_write(w, is_inter, vp10_get_intra_inter_prob(cm, xd));
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  if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT &&
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#if CONFIG_SUPERTX
      !supertx_enabled &&
#endif  // CONFIG_SUPERTX
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      !(is_inter && skip) && !xd->lossless[segment_id]) {
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#if CONFIG_VAR_TX
    if (is_inter) {  // This implies skip flag is 0.
      const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
      const int txb_size = txsize_to_bsize[max_tx_size];
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      const int bs = num_4x4_blocks_wide_lookup[txb_size];
      const int width  = num_4x4_blocks_wide_lookup[bsize];
      const int height = num_4x4_blocks_high_lookup[bsize];
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      int idx, idy;
      for (idy = 0; idy < height; idy += bs)
        for (idx = 0; idx < width; idx += bs)
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          write_tx_size_inter(cm, xd, mbmi, max_tx_size, idy, idx, w);
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    } else {
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      set_txfm_ctx(xd->left_txfm_context, mbmi->tx_size, xd->n8_h);
      set_txfm_ctx(xd->above_txfm_context, mbmi->tx_size, xd->n8_w);

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      write_selected_tx_size(cm, xd, w);
    }
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  } else {
    set_txfm_ctx(xd->left_txfm_context, mbmi->tx_size, xd->n8_h);
    set_txfm_ctx(xd->above_txfm_context, mbmi->tx_size, xd->n8_w);
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#else
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  write_selected_tx_size(cm, xd, w);
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#endif
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  }

  if (!is_inter) {
    if (bsize >= BLOCK_8X8) {
      write_intra_mode(w, mode, cm->fc->y_mode_prob[size_group_lookup[bsize]]);
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#if CONFIG_EXT_INTRA
      if (mode != DC_PRED && mode != TM_PRED) {
        write_uniform(w, 2 * MAX_ANGLE_DELTAS + 1,
                      MAX_ANGLE_DELTAS + mbmi->angle_delta[0]);
      }
#endif  // CONFIG_EXT_INTRA
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    } else {
      int idx, idy;
      const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
      const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
      for (idy = 0; idy < 2; idy += num_4x4_h) {
        for (idx = 0; idx < 2; idx += num_4x4_w) {
          const PREDICTION_MODE b_mode = mi->bmi[idy * 2 + idx].as_mode;
          write_intra_mode(w, b_mode, cm->fc->y_mode_prob[0]);
        }
      }
    }
    write_intra_mode(w, mbmi->uv_mode, cm->fc->uv_mode_prob[mode]);
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#if CONFIG_EXT_INTRA
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    if (mbmi->uv_mode != DC_PRED && mbmi->uv_mode != TM_PRED &&
        bsize >= BLOCK_8X8)
      write_uniform(w, 2 * MAX_ANGLE_DELTAS + 1,
                    MAX_ANGLE_DELTAS + mbmi->angle_delta[1]);

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    if (bsize >= BLOCK_8X8)
      write_ext_intra_mode_info(cm, mbmi, w);
#endif  // CONFIG_EXT_INTRA
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  } else {
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    int16_t mode_ctx = mbmi_ext->mode_context[mbmi->ref_frame[0]];
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    write_ref_frames(cm, xd, w);

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#if CONFIG_REF_MV
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#if CONFIG_EXT_INTER
    if (is_compound)
      mode_ctx = mbmi_ext->compound_mode_context[mbmi->ref_frame[0]];
    else
#endif  // CONFIG_EXT_INTER
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    mode_ctx = vp10_mode_context_analyzer(mbmi_ext->mode_context,
                                          mbmi->ref_frame, bsize, -1);
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#endif

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    // If segment skip is not enabled code the mode.
    if (!segfeature_active(seg, segment_id, SEG_LVL_SKIP)) {
      if (bsize >= BLOCK_8X8) {
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#if CONFIG_EXT_INTER
        if (is_inter_compound_mode(mode))
          write_inter_compound_mode(cm, w, mode, mode_ctx);
        else if (is_inter_singleref_mode(mode))
#endif  // CONFIG_EXT_INTER
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        write_inter_mode(cm, w, mode,
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                         has_second_ref(mbmi),
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                         mode_ctx);
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      }
    }

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#if !CONFIG_EXT_INTERP
    write_switchable_interp_filter(cpi, xd, w);
#endif  // !CONFIG_EXT_INTERP
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    if (bsize < BLOCK_8X8) {
      const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
      const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
      int idx, idy;
      for (idy = 0; idy < 2; idy += num_4x4_h) {
        for (idx = 0; idx < 2; idx += num_4x4_w) {
          const int j = idy * 2 + idx;
          const PREDICTION_MODE b_mode = mi->bmi[j].as_mode;
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#if CONFIG_EXT_INTER
          if (!is_compound)
#endif  // CONFIG_EXT_INTER
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          mode_ctx = vp10_mode_context_analyzer(mbmi_ext->mode_context,
                                                mbmi->ref_frame, bsize, j);
#endif
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#if CONFIG_EXT_INTER
          if (is_inter_compound_mode(b_mode))
            write_inter_compound_mode(cm, w, b_mode, mode_ctx);
          else if (is_inter_singleref_mode(b_mode))
#endif  // CONFIG_EXT_INTER
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          write_inter_mode(cm, w, b_mode,
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                           has_second_ref(mbmi),
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                           mode_ctx);

#if CONFIG_EXT_INTER
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          if (b_mode == NEWMV || b_mode == NEWFROMNEARMV ||
              b_mode == NEW_NEWMV) {
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#else
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          if (b_mode == NEWMV) {
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#endif  // CONFIG_EXT_INTER
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            for (ref = 0; ref < 1 + is_compound; ++ref)
              vp10_encode_mv(cpi, w, &mi->bmi[j].as_mv[ref].as_mv,
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#if CONFIG_EXT_INTER
                             &mi->bmi[j].ref_mv[ref].as_mv,
#else
                             &mbmi_ext->ref_mvs[mbmi->ref_frame[ref]][0].as_mv,
#endif  // CONFIG_EXT_INTER
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                            nmvc, allow_hp);
          }
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#if CONFIG_EXT_INTER
          else if (b_mode == NEAREST_NEWMV || b_mode == NEAR_NEWMV) {
            vp10_encode_mv(cpi, w, &mi->bmi[j].as_mv[1].as_mv,
                           &mi->bmi[j].ref_mv[1].as_mv, nmvc, allow_hp);
          } else if (b_mode == NEW_NEARESTMV || b_mode == NEW_NEARMV) {
            vp10_encode_mv(cpi, w, &mi->bmi[j].as_mv[0].as_mv,
                           &mi->bmi[j].ref_mv[0].as_mv, nmvc, allow_hp);
          }
#endif  // CONFIG_EXT_INTER
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        }
      }
    } else {
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#if CONFIG_EXT_INTER
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      if (mode == NEWMV || mode == NEWFROMNEARMV || mode == NEW_NEWMV) {
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#else
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      if (mode == NEWMV) {
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#endif  // CONFIG_EXT_INTER
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        for (ref = 0; ref < 1 + is_compound; ++ref)
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#if CONFIG_EXT_INTER
        {
          if (mode == NEWFROMNEARMV)
            vp10_encode_mv(cpi, w, &mbmi->mv[ref].as_mv,
                           &mbmi_ext->ref_mvs[mbmi->ref_frame[ref]][1].as_mv,
                           nmvc, allow_hp);
          else
#endif  // CONFIG_EXT_INTER
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          vp10_encode_mv(cpi, w, &mbmi->mv[ref].as_mv,
                        &mbmi_ext->ref_mvs[mbmi->ref_frame[ref]][0].as_mv, nmvc,
                        allow_hp);
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#if CONFIG_EXT_INTER
        }
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      } else if (mode == NEAREST_NEWMV || mode == NEAR_NEWMV) {
        vp10_encode_mv(cpi, w, &mbmi->mv[1].as_mv,
                       &mbmi_ext->ref_mvs[mbmi->ref_frame[1]][0].as_mv, nmvc,
                       allow_hp);
      } else if (mode == NEW_NEARESTMV || mode == NEW_NEARMV) {
        vp10_encode_mv(cpi, w, &mbmi->mv[0].as_mv,
                       &mbmi_ext->ref_mvs[mbmi->ref_frame[0]][0].as_mv, nmvc,
                       allow_hp);
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#endif  // CONFIG_EXT_INTER
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      }
    }
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#if CONFIG_EXT_INTERP
    write_switchable_interp_filter(cpi, xd, w);
#endif  // CONFIG_EXT_INTERP
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  }
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#if CONFIG_EXT_TX
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  if (get_ext_tx_types(mbmi->tx_size, bsize, is_inter) > 1 &&
      cm->base_qindex > 0 && !mbmi->skip &&
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#if CONFIG_SUPERTX
      !supertx_enabled &&
#endif  // CONFIG_SUPERTX
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      !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
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    int eset = get_ext_tx_set(mbmi->tx_size, bsize, is_inter);
    if (is_inter) {
      if (eset > 0)
        vp10_write_token(w, vp10_ext_tx_inter_tree[eset],
                         cm->fc->inter_ext_tx_prob[eset][mbmi->tx_size],
                         &ext_tx_inter_encodings[eset][mbmi->tx_type]);
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    } else if (ALLOW_INTRA_EXT_TX) {
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      if (eset > 0)
        vp10_write_token(
            w, vp10_ext_tx_intra_tree[eset],
            cm->fc->intra_ext_tx_prob[eset][mbmi->tx_size][mbmi->mode],
            &ext_tx_intra_encodings[eset][mbmi->tx_type]);
    }
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  }
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#else
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  if (mbmi->tx_size < TX_32X32 &&
      cm->base_qindex > 0 && !mbmi->skip &&
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#if CONFIG_SUPERTX
      !supertx_enabled &&
#endif  // CONFIG_SUPERTX
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      !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
    if (is_inter) {
      vp10_write_token(
          w, vp10_ext_tx_tree,
          cm->fc->inter_ext_tx_prob[mbmi->tx_size],
          &ext_tx_encodings[mbmi->tx_type]);
    } else {
      vp10_write_token(
          w, vp10_ext_tx_tree,
          cm->fc->intra_ext_tx_prob[mbmi->tx_size]
                                   [intra_mode_to_tx_type_context[mbmi->mode]],
          &ext_tx_encodings[mbmi->tx_type]);
    }
  } else {
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    if (!mbmi->skip) {
#if CONFIG_SUPERTX
      if (!supertx_enabled)
#endif  // CONFIG_SUPERTX
        assert(mbmi->tx_type == DCT_DCT);
    }
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  }
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#endif  // CONFIG_EXT_TX
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}

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static void write_palette_mode_info(const VP10_COMMON *cm,
                                    const MACROBLOCKD *xd,
                                    const MODE_INFO *const mi,
                                    vpx_writer *w) {
  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MODE_INFO *const above_mi = xd->above_mi;
  const MODE_INFO *const left_mi = xd->left_mi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
  const PALETTE_MODE_INFO *pmi = &mbmi->palette_mode_info;
  int palette_ctx = 0;
  int n, i;

  n = pmi->palette_size[0];
  if (above_mi)
    palette_ctx += (above_mi->mbmi.palette_mode_info.palette_size[0] > 0);
  if (left_mi)
    palette_ctx += (left_mi->mbmi.palette_mode_info.palette_size[0] > 0);
  vpx_write(w, n > 0,
            vp10_default_palette_y_mode_prob[bsize - BLOCK_8X8][palette_ctx]);
  if (n > 0) {
    vp10_write_token(w, vp10_palette_size_tree,
                     vp10_default_palette_y_size_prob[bsize - BLOCK_8X8],
                     &palette_size_encodings[n - 2]);
    for (i = 0; i < n; ++i)
      vpx_write_literal(w, pmi->palette_colors[i],
                        cm->bit_depth);
    write_uniform(w, n, pmi->palette_first_color_idx[0]);
  }
}

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static void write_mb_modes_kf(const VP10_COMMON *cm, const MACROBLOCKD *xd,
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                              MODE_INFO **mi_8x8, vpx_writer *w) {
  const struct segmentation *const seg = &cm->seg;
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  const struct segmentation_probs *const segp = &cm->fc->seg;
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  const MODE_INFO *const mi = mi_8x8[0];
  const MODE_INFO *const above_mi = xd->above_mi;
  const MODE_INFO *const left_mi = xd->left_mi;
  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;

  if (seg->update_map)
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    write_segment_id(w, seg, segp, mbmi->segment_id);
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  write_skip(cm, xd, mbmi->segment_id, mi, w);

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  if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT &&
      !xd->lossless[mbmi->segment_id])
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    write_selected_tx_size(cm, xd, w);

  if (bsize >= BLOCK_8X8) {
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    write_intra_mode(w, mbmi->mode,
                     get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
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#if CONFIG_EXT_INTRA
    if (mbmi->mode != DC_PRED && mbmi->mode != TM_PRED)
      write_uniform(w, 2 * MAX_ANGLE_DELTAS + 1,
                    MAX_ANGLE_DELTAS + mbmi->angle_delta[0]);
#endif  // CONFIG_EXT_INTRA
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  } else {
    const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
    const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
    int idx, idy;

    for (idy = 0; idy < 2; idy += num_4x4_h) {
      for (idx = 0; idx < 2; idx += num_4x4_w) {
        const int block = idy * 2 + idx;
        write_intra_mode(w, mi->bmi[block].as_mode,
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                         get_y_mode_probs(cm, mi, above_mi, left_mi, block));
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      }
    }
  }

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  write_intra_mode(w, mbmi->uv_mode, cm->fc->uv_mode_prob[mbmi->mode]);
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#if CONFIG_EXT_INTRA
  if (mbmi->uv_mode != DC_PRED && mbmi->uv_mode != TM_PRED &&
      bsize >= BLOCK_8X8)
    write_uniform(w, 2 * MAX_ANGLE_DELTAS + 1,
                  MAX_ANGLE_DELTAS + mbmi->angle_delta[1]);
#endif  // CONFIG_EXT_INTRA
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  if (bsize >= BLOCK_8X8 && cm->allow_screen_content_tools &&
      mbmi->mode == DC_PRED)
    write_palette_mode_info(cm, xd, mi, w);

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#if CONFIG_EXT_TX
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  if (get_ext_tx_types(mbmi->tx_size, bsize, 0) > 1 &&
      cm->base_qindex > 0 && !mbmi->skip &&
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      !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP) &&
      ALLOW_INTRA_EXT_TX) {
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    int eset = get_ext_tx_set(mbmi->tx_size, bsize, 0);
    if (eset > 0)
      vp10_write_token(
          w, vp10_ext_tx_intra_tree[eset],
          cm->fc->intra_ext_tx_prob[eset][mbmi->tx_size][mbmi->mode],
          &ext_tx_intra_encodings[eset][mbmi->tx_type]);
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  }
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#else
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  if (mbmi->tx_size < TX_32X32 &&
      cm->base_qindex > 0 && !mbmi->skip &&
      !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
    vp10_write_token(
        w, vp10_ext_tx_tree,
        cm->fc->intra_ext_tx_prob[mbmi->tx_size]
                                 [intra_mode_to_tx_type_context[mbmi->mode]],
        &ext_tx_encodings[mbmi->tx_type]);
  }
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#endif  // CONFIG_EXT_TX
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#if CONFIG_EXT_INTRA
  if (bsize >= BLOCK_8X8)
      write_ext_intra_mode_info(cm, mbmi, w);
#endif  // CONFIG_EXT_INTRA
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}

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static void write_modes_b(VP10_COMP *cpi, const TileInfo *const tile,
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                          vpx_writer *w, TOKENEXTRA **tok,
                          const TOKENEXTRA *const tok_end,
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#if CONFIG_SUPERTX
                          int supertx_enabled,
#endif
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                          int mi_row, int mi_col) {
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  const VP10_COMMON *const cm = &cpi->common;
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  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
  MODE_INFO *m;
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  int plane;
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#if CONFIG_ANS
  (void) tok;
  (void) tok_end;
  (void) plane;
#endif  // !CONFIG_ANS
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  xd->mi = cm->mi_grid_visible + (mi_row * cm->mi_stride + mi_col);
  m = xd->mi[0];

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  cpi->td.mb.mbmi_ext = cpi->mbmi_ext_base + (mi_row * cm->mi_cols + mi_col);
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  set_mi_row_col(xd, tile,
                 mi_row, num_8x8_blocks_high_lookup[m->mbmi.sb_type],
                 mi_col, num_8x8_blocks_wide_lookup[m->mbmi.sb_type],
                 cm->mi_rows, cm->mi_cols);
  if (frame_is_intra_only(cm)) {
    write_mb_modes_kf(cm, xd, xd->mi, w);
  } else {
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#if CONFIG_VAR_TX
    xd->above_txfm_context = cm->above_txfm_context + mi_col;
    xd->left_txfm_context = xd->left_txfm_context_buffer + (mi_row & 0x07);
#endif
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    pack_inter_mode_mvs(cpi, m,
#if CONFIG_SUPERTX
                        supertx_enabled,
#endif
                        w);
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  }

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  if (m->mbmi.palette_mode_info.palette_size[0] > 0) {
    assert(*tok < tok_end);
    pack_palette_tokens(w, tok, m->mbmi.sb_type,
                        m->mbmi.palette_mode_info.palette_size[0]);
    assert(*tok < tok_end);
  }

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#if CONFIG_SUPERTX
  if (supertx_enabled) return;
#endif  // CONFIG_SUPERTX

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#if !CONFIG_ANS
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  if (!m->mbmi.skip) {
    assert(*tok < tok_end);
    for (plane = 0; plane < MAX_MB_PLANE; ++plane) {
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#if CONFIG_VAR_TX
      const struct macroblockd_plane *const pd = &xd->plane[plane];
      MB_MODE_INFO *mbmi = &m->mbmi;
      BLOCK_SIZE bsize = mbmi->sb_type;
      const BLOCK_SIZE plane_bsize =
          get_plane_block_size(VPXMAX(bsize, BLOCK_8X8), pd);

      const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
      const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
      int row, col;

      if (is_inter_block(mbmi)) {
        const TX_SIZE max_tx_size = max_txsize_lookup[plane_bsize];
        const BLOCK_SIZE txb_size = txsize_to_bsize[max_tx_size];
        int bw = num_4x4_blocks_wide_lookup[txb_size];
        int block = 0;
        const int step = 1 << (max_tx_size << 1);
        for (row = 0; row < num_4x4_h; row += bw) {
          for (col = 0; col < num_4x4_w; col += bw) {
            pack_txb_tokens(w, tok, tok_end, xd, mbmi, plane, plane_bsize,
                            cm->bit_depth, block, row, col, max_tx_size);
            block += step;
          }
        }
      } else {
        TX_SIZE tx = plane ? get_uv_tx_size(&m->mbmi, &xd->plane[plane])
                           : m->mbmi.tx_size;
        BLOCK_SIZE txb_size = txsize_to_bsize[tx];
        int bw = num_4x4_blocks_wide_lookup[txb_size];

        for (row = 0; row < num_4x4_h; row += bw)
          for (col = 0; col < num_4x4_w; col += bw)
            pack_mb_tokens(w, tok, tok_end, cm->bit_depth, tx);
      }
#else
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      TX_SIZE tx = plane ? get_uv_tx_size(&m->mbmi, &xd->plane[plane])
                         : m->mbmi.tx_size;
      pack_mb_tokens(w, tok, tok_end, cm->bit_depth, tx);
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#endif  // CONFIG_VAR_TX
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      assert(*tok < tok_end && (*tok)->token == EOSB_TOKEN);
      (*tok)++;
    }
  }
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#endif
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}

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static void write_partition(const VP10_COMMON *const cm,
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                            const MACROBLOCKD *const xd,
                            int hbs, int mi_row, int mi_col,
                            PARTITION_TYPE p, BLOCK_SIZE bsize, vpx_writer *w) {
  const int ctx = partition_plane_context(xd, mi_row, mi_col, bsize);
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  const vpx_prob *const probs = cm->fc->partition_prob[ctx];
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