Add m-esr52 at 52.6.0

1 files changed, 614 insertions, 0 deletions

diff --git a/media/libvpx/vp9/decoder/vp9_decodemv.c b/media/libvpx/vp9/decoder/vp9_decodemv.c
new file mode 100644
index 000000000..7ce3389e8
--- /dev/null
+++ b/media/libvpx/vp9/decoder/vp9_decodemv.c
@@ -0,0 +1,614 @@
+/*
+  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 "vp9/common/vp9_common.h"
+#include "vp9/common/vp9_entropy.h"
+#include "vp9/common/vp9_entropymode.h"
+#include "vp9/common/vp9_entropymv.h"
+#include "vp9/common/vp9_mvref_common.h"
+#include "vp9/common/vp9_pred_common.h"
+#include "vp9/common/vp9_reconinter.h"
+#include "vp9/common/vp9_seg_common.h"
+
+#include "vp9/decoder/vp9_decodemv.h"
+#include "vp9/decoder/vp9_decodeframe.h"
+#include "vp9/decoder/vp9_reader.h"
+
+static PREDICTION_MODE read_intra_mode(vp9_reader *r, const vp9_prob *p) {
+  return (PREDICTION_MODE)vp9_read_tree(r, vp9_intra_mode_tree, p);
+}
+
+static PREDICTION_MODE read_intra_mode_y(VP9_COMMON *cm, MACROBLOCKD *xd,
+                                         vp9_reader *r, int size_group) {
+  const PREDICTION_MODE y_mode =
+      read_intra_mode(r, cm->fc->y_mode_prob[size_group]);
+  FRAME_COUNTS *counts = xd->counts;
+  if (counts)
+    ++counts->y_mode[size_group][y_mode];
+  return y_mode;
+}
+
+static PREDICTION_MODE read_intra_mode_uv(VP9_COMMON *cm, MACROBLOCKD *xd,
+                                          vp9_reader *r,
+                                          PREDICTION_MODE y_mode) {
+  const PREDICTION_MODE uv_mode = read_intra_mode(r,
+                                         cm->fc->uv_mode_prob[y_mode]);
+  FRAME_COUNTS *counts = xd->counts;
+  if (counts)
+    ++counts->uv_mode[y_mode][uv_mode];
+  return uv_mode;
+}
+
+static PREDICTION_MODE read_inter_mode(VP9_COMMON *cm, MACROBLOCKD *xd,
+                                       vp9_reader *r, int ctx) {
+  const int mode = vp9_read_tree(r, vp9_inter_mode_tree,
+                                 cm->fc->inter_mode_probs[ctx]);
+  FRAME_COUNTS *counts = xd->counts;
+  if (counts)
+    ++counts->inter_mode[ctx][mode];
+
+  return NEARESTMV + mode;
+}
+
+static int read_segment_id(vp9_reader *r, const struct segmentation *seg) {
+  return vp9_read_tree(r, vp9_segment_tree, seg->tree_probs);
+}
+
+static TX_SIZE read_selected_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd,
+                                     TX_SIZE max_tx_size, vp9_reader *r) {
+  FRAME_COUNTS *counts = xd->counts;
+  const int ctx = vp9_get_tx_size_context(xd);
+  const vp9_prob *tx_probs = get_tx_probs(max_tx_size, ctx, &cm->fc->tx_probs);
+  int tx_size = vp9_read(r, tx_probs[0]);
+  if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {
+    tx_size += vp9_read(r, tx_probs[1]);
+    if (tx_size != TX_8X8 && max_tx_size >= TX_32X32)
+      tx_size += vp9_read(r, tx_probs[2]);
+  }
+
+  if (counts)
+    ++get_tx_counts(max_tx_size, ctx, &counts->tx)[tx_size];
+  return (TX_SIZE)tx_size;
+}
+
+static TX_SIZE read_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd,
+                            int allow_select, vp9_reader *r) {
+  TX_MODE tx_mode = cm->tx_mode;
+  BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
+  const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
+  if (allow_select && tx_mode == TX_MODE_SELECT && bsize >= BLOCK_8X8)
+    return read_selected_tx_size(cm, xd, max_tx_size, r);
+  else
+    return MIN(max_tx_size, tx_mode_to_biggest_tx_size[tx_mode]);
+}
+
+static void set_segment_id(VP9_COMMON *cm, BLOCK_SIZE bsize,
+                           int mi_row, int mi_col, int segment_id) {
+  const int mi_offset = mi_row * cm->mi_cols + mi_col;
+  const int bw = num_8x8_blocks_wide_lookup[bsize];
+  const int bh = num_8x8_blocks_high_lookup[bsize];
+  const int xmis = MIN(cm->mi_cols - mi_col, bw);
+  const int ymis = MIN(cm->mi_rows - mi_row, bh);
+  int x, y;
+
+  assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
+
+  for (y = 0; y < ymis; y++)
+    for (x = 0; x < xmis; x++)
+      cm->current_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
+}
+
+static void copy_segment_id(const VP9_COMMON *cm,
+                           const uint8_t *last_segment_ids,
+                           uint8_t *current_segment_ids,
+                           BLOCK_SIZE bsize, int mi_row, int mi_col) {
+  const int mi_offset = mi_row * cm->mi_cols + mi_col;
+  const int bw = num_8x8_blocks_wide_lookup[bsize];
+  const int bh = num_8x8_blocks_high_lookup[bsize];
+  const int xmis = MIN(cm->mi_cols - mi_col, bw);
+  const int ymis = MIN(cm->mi_rows - mi_row, bh);
+  int x, y;
+
+  for (y = 0; y < ymis; y++)
+    for (x = 0; x < xmis; x++)
+      current_segment_ids[mi_offset + y * cm->mi_cols + x] =  last_segment_ids ?
+          last_segment_ids[mi_offset + y * cm->mi_cols + x] : 0;
+}
+
+static int read_intra_segment_id(VP9_COMMON *const cm, BLOCK_SIZE bsize,
+                                 int mi_row, int mi_col,
+                                 vp9_reader *r) {
+  struct segmentation *const seg = &cm->seg;
+  int segment_id;
+
+  if (!seg->enabled)
+    return 0;  // Default for disabled segmentation
+
+  if (!seg->update_map) {
+    copy_segment_id(cm, cm->last_frame_seg_map, cm->current_frame_seg_map,
+                    bsize, mi_row, mi_col);
+    return 0;
+  }
+
+  segment_id = read_segment_id(r, seg);
+  set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
+  return segment_id;
+}
+
+static int read_inter_segment_id(VP9_COMMON *const cm, MACROBLOCKD *const xd,
+                                 int mi_row, int mi_col, vp9_reader *r) {
+  struct segmentation *const seg = &cm->seg;
+  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
+  const BLOCK_SIZE bsize = mbmi->sb_type;
+  int predicted_segment_id, segment_id;
+
+  if (!seg->enabled)
+    return 0;  // Default for disabled segmentation
+
+  predicted_segment_id = cm->last_frame_seg_map ?
+      vp9_get_segment_id(cm, cm->last_frame_seg_map, bsize, mi_row, mi_col) : 0;
+
+  if (!seg->update_map) {
+    copy_segment_id(cm, cm->last_frame_seg_map, cm->current_frame_seg_map,
+                    bsize, mi_row, mi_col);
+    return predicted_segment_id;
+  }
+
+  if (seg->temporal_update) {
+    const vp9_prob pred_prob = vp9_get_pred_prob_seg_id(seg, xd);
+    mbmi->seg_id_predicted = vp9_read(r, pred_prob);
+    segment_id = mbmi->seg_id_predicted ? predicted_segment_id
+                                        : read_segment_id(r, seg);
+  } else {
+    segment_id = read_segment_id(r, seg);
+  }
+  set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
+  return segment_id;
+}
+
+static int read_skip(VP9_COMMON *cm, const MACROBLOCKD *xd,
+                     int segment_id, vp9_reader *r) {
+  if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
+    return 1;
+  } else {
+    const int ctx = vp9_get_skip_context(xd);
+    const int skip = vp9_read(r, cm->fc->skip_probs[ctx]);
+    FRAME_COUNTS *counts = xd->counts;
+    if (counts)
+      ++counts->skip[ctx][skip];
+    return skip;
+  }
+}
+
+static void read_intra_frame_mode_info(VP9_COMMON *const cm,
+                                       MACROBLOCKD *const xd,
+                                       int mi_row, int mi_col, vp9_reader *r) {
+  MODE_INFO *const mi = xd->mi[0];
+  MB_MODE_INFO *const mbmi = &mi->mbmi;
+  const MODE_INFO *above_mi = xd->above_mi;
+  const MODE_INFO *left_mi  = xd->left_mi;
+  const BLOCK_SIZE bsize = mbmi->sb_type;
+  int i;
+
+  mbmi->segment_id = read_intra_segment_id(cm, bsize, mi_row, mi_col, r);
+  mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);
+  mbmi->tx_size = read_tx_size(cm, xd, 1, r);
+  mbmi->ref_frame[0] = INTRA_FRAME;
+  mbmi->ref_frame[1] = NONE;
+
+  switch (bsize) {
+    case BLOCK_4X4:
+      for (i = 0; i < 4; ++i)
+        mi->bmi[i].as_mode =
+            read_intra_mode(r, get_y_mode_probs(mi, above_mi, left_mi, i));
+      mbmi->mode = mi->bmi[3].as_mode;
+      break;
+    case BLOCK_4X8:
+      mi->bmi[0].as_mode = mi->bmi[2].as_mode =
+          read_intra_mode(r, get_y_mode_probs(mi, above_mi, left_mi, 0));
+      mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
+          read_intra_mode(r, get_y_mode_probs(mi, above_mi, left_mi, 1));
+      break;
+    case BLOCK_8X4:
+      mi->bmi[0].as_mode = mi->bmi[1].as_mode =
+          read_intra_mode(r, get_y_mode_probs(mi, above_mi, left_mi, 0));
+      mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
+          read_intra_mode(r, get_y_mode_probs(mi, above_mi, left_mi, 2));
+      break;
+    default:
+      mbmi->mode = read_intra_mode(r,
+                                   get_y_mode_probs(mi, above_mi, left_mi, 0));
+  }
+
+  mbmi->uv_mode = read_intra_mode(r, vp9_kf_uv_mode_prob[mbmi->mode]);
+}
+
+static int read_mv_component(vp9_reader *r,
+                             const nmv_component *mvcomp, int usehp) {
+  int mag, d, fr, hp;
+  const int sign = vp9_read(r, mvcomp->sign);
+  const int mv_class = vp9_read_tree(r, vp9_mv_class_tree, mvcomp->classes);
+  const int class0 = mv_class == MV_CLASS_0;
+
+  // Integer part
+  if (class0) {
+    d = vp9_read_tree(r, vp9_mv_class0_tree, mvcomp->class0);
+  } else {
+    int i;
+    const int n = mv_class + CLASS0_BITS - 1;  // number of bits
+
+    d = 0;
+    for (i = 0; i < n; ++i)
+      d |= vp9_read(r, mvcomp->bits[i]) << i;
+  }
+
+  // Fractional part
+  fr = vp9_read_tree(r, vp9_mv_fp_tree, class0 ? mvcomp->class0_fp[d]
+                                               : mvcomp->fp);
+
+  // High precision part (if hp is not used, the default value of the hp is 1)
+  hp = usehp ? vp9_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp)
+             : 1;
+
+  // Result
+  mag = vp9_get_mv_mag(mv_class, (d << 3) | (fr << 1) | hp) + 1;
+  return sign ? -mag : mag;
+}
+
+static INLINE void read_mv(vp9_reader *r, MV *mv, const MV *ref,
+                           const nmv_context *ctx,
+                           nmv_context_counts *counts, int allow_hp) {
+  const MV_JOINT_TYPE joint_type =
+      (MV_JOINT_TYPE)vp9_read_tree(r, vp9_mv_joint_tree, ctx->joints);
+  const int use_hp = allow_hp && vp9_use_mv_hp(ref);
+  MV diff = {0, 0};
+
+  if (mv_joint_vertical(joint_type))
+    diff.row = read_mv_component(r, &ctx->comps[0], use_hp);
+
+  if (mv_joint_horizontal(joint_type))
+    diff.col = read_mv_component(r, &ctx->comps[1], use_hp);
+
+  vp9_inc_mv(&diff, counts);
+
+  mv->row = ref->row + diff.row;
+  mv->col = ref->col + diff.col;
+}
+
+static REFERENCE_MODE read_block_reference_mode(VP9_COMMON *cm,
+                                                const MACROBLOCKD *xd,
+                                                vp9_reader *r) {
+  if (cm->reference_mode == REFERENCE_MODE_SELECT) {
+    const int ctx = vp9_get_reference_mode_context(cm, xd);
+    const REFERENCE_MODE mode =
+        (REFERENCE_MODE)vp9_read(r, cm->fc->comp_inter_prob[ctx]);
+    FRAME_COUNTS *counts = xd->counts;
+    if (counts)
+      ++counts->comp_inter[ctx][mode];
+    return mode;  // SINGLE_REFERENCE or COMPOUND_REFERENCE
+  } else {
+    return cm->reference_mode;
+  }
+}
+
+// Read the referncence frame
+static void read_ref_frames(VP9_COMMON *const cm, MACROBLOCKD *const xd,
+                            vp9_reader *r,
+                            int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {
+  FRAME_CONTEXT *const fc = cm->fc;
+  FRAME_COUNTS *counts = xd->counts;
+
+  if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
+    ref_frame[0] = (MV_REFERENCE_FRAME)vp9_get_segdata(&cm->seg, segment_id,
+                                                       SEG_LVL_REF_FRAME);
+    ref_frame[1] = NONE;
+  } else {
+    const REFERENCE_MODE mode = read_block_reference_mode(cm, xd, r);
+    // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
+    if (mode == COMPOUND_REFERENCE) {
+      const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
+      const int ctx = vp9_get_pred_context_comp_ref_p(cm, xd);
+      const int bit = vp9_read(r, fc->comp_ref_prob[ctx]);
+      if (counts)
+        ++counts->comp_ref[ctx][bit];
+      ref_frame[idx] = cm->comp_fixed_ref;
+      ref_frame[!idx] = cm->comp_var_ref[bit];
+    } else if (mode == SINGLE_REFERENCE) {
+      const int ctx0 = vp9_get_pred_context_single_ref_p1(xd);
+      const int bit0 = vp9_read(r, fc->single_ref_prob[ctx0][0]);
+      if (counts)
+        ++counts->single_ref[ctx0][0][bit0];
+      if (bit0) {
+        const int ctx1 = vp9_get_pred_context_single_ref_p2(xd);
+        const int bit1 = vp9_read(r, fc->single_ref_prob[ctx1][1]);
+        if (counts)
+          ++counts->single_ref[ctx1][1][bit1];
+        ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
+      } else {
+        ref_frame[0] = LAST_FRAME;
+      }
+
+      ref_frame[1] = NONE;
+    } else {
+      assert(0 && "Invalid prediction mode.");
+    }
+  }
+}
+
+
+static INLINE INTERP_FILTER read_switchable_interp_filter(
+    VP9_COMMON *const cm, MACROBLOCKD *const xd,
+    vp9_reader *r) {
+  const int ctx = vp9_get_pred_context_switchable_interp(xd);
+  const INTERP_FILTER type =
+      (INTERP_FILTER)vp9_read_tree(r, vp9_switchable_interp_tree,
+                                   cm->fc->switchable_interp_prob[ctx]);
+  FRAME_COUNTS *counts = xd->counts;
+  if (counts)
+    ++counts->switchable_interp[ctx][type];
+  return type;
+}
+
+static void read_intra_block_mode_info(VP9_COMMON *const cm,
+                                       MACROBLOCKD *const xd, MODE_INFO *mi,
+                                       vp9_reader *r) {
+  MB_MODE_INFO *const mbmi = &mi->mbmi;
+  const BLOCK_SIZE bsize = mi->mbmi.sb_type;
+  int i;
+
+  mbmi->ref_frame[0] = INTRA_FRAME;
+  mbmi->ref_frame[1] = NONE;
+
+  switch (bsize) {
+    case BLOCK_4X4:
+      for (i = 0; i < 4; ++i)
+        mi->bmi[i].as_mode = read_intra_mode_y(cm, xd, r, 0);
+      mbmi->mode = mi->bmi[3].as_mode;
+      break;
+    case BLOCK_4X8:
+      mi->bmi[0].as_mode = mi->bmi[2].as_mode = read_intra_mode_y(cm, xd,
+                                                                  r, 0);
+      mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
+          read_intra_mode_y(cm, xd, r, 0);
+      break;
+    case BLOCK_8X4:
+      mi->bmi[0].as_mode = mi->bmi[1].as_mode = read_intra_mode_y(cm, xd,
+                                                                  r, 0);
+      mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
+          read_intra_mode_y(cm, xd, r, 0);
+      break;
+    default:
+      mbmi->mode = read_intra_mode_y(cm, xd, r, size_group_lookup[bsize]);
+  }
+
+  mbmi->uv_mode = read_intra_mode_uv(cm, xd, r, mbmi->mode);
+}
+
+static INLINE int is_mv_valid(const MV *mv) {
+  return mv->row > MV_LOW && mv->row < MV_UPP &&
+         mv->col > MV_LOW && mv->col < MV_UPP;
+}
+
+static INLINE int assign_mv(VP9_COMMON *cm, MACROBLOCKD *xd,
+                            PREDICTION_MODE mode,
+                            int_mv mv[2], int_mv ref_mv[2],
+                            int_mv nearest_mv[2], int_mv near_mv[2],
+                            int is_compound, int allow_hp, vp9_reader *r) {
+  int i;
+  int ret = 1;
+
+  switch (mode) {
+    case NEWMV: {
+      FRAME_COUNTS *counts = xd->counts;
+      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
+      for (i = 0; i < 1 + is_compound; ++i) {
+        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc, mv_counts,
+                allow_hp);
+        ret = ret && is_mv_valid(&mv[i].as_mv);
+      }
+      break;
+    }
+    case NEARESTMV: {
+      mv[0].as_int = nearest_mv[0].as_int;
+      if (is_compound)
+        mv[1].as_int = nearest_mv[1].as_int;
+      break;
+    }
+    case NEARMV: {
+      mv[0].as_int = near_mv[0].as_int;
+      if (is_compound)
+        mv[1].as_int = near_mv[1].as_int;
+      break;
+    }
+    case ZEROMV: {
+      mv[0].as_int = 0;
+      if (is_compound)
+        mv[1].as_int = 0;
+      break;
+    }
+    default: {
+      return 0;
+    }
+  }
+  return ret;
+}
+
+static int read_is_inter_block(VP9_COMMON *const cm, MACROBLOCKD *const xd,
+                               int segment_id, vp9_reader *r) {
+  if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
+    return vp9_get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) !=
+           INTRA_FRAME;
+  } else {
+    const int ctx = vp9_get_intra_inter_context(xd);
+    const int is_inter = vp9_read(r, cm->fc->intra_inter_prob[ctx]);
+    FRAME_COUNTS *counts = xd->counts;
+    if (counts)
+      ++counts->intra_inter[ctx][is_inter];
+    return is_inter;
+  }
+}
+
+static void fpm_sync(void *const data, int mi_row) {
+  VP9Decoder *const pbi = (VP9Decoder *)data;
+  vp9_frameworker_wait(pbi->frame_worker_owner, pbi->common.prev_frame,
+                       mi_row << MI_BLOCK_SIZE_LOG2);
+}
+
+static void read_inter_block_mode_info(VP9Decoder *const pbi,
+                                       MACROBLOCKD *const xd,
+                                       const TileInfo *const tile,
+                                       MODE_INFO *const mi,
+                                       int mi_row, int mi_col, vp9_reader *r) {
+  VP9_COMMON *const cm = &pbi->common;
+  MB_MODE_INFO *const mbmi = &mi->mbmi;
+  const BLOCK_SIZE bsize = mbmi->sb_type;
+  const int allow_hp = cm->allow_high_precision_mv;
+  int_mv nearestmv[2], nearmv[2];
+  int inter_mode_ctx, ref, is_compound;
+
+  read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
+  is_compound = has_second_ref(mbmi);
+
+  for (ref = 0; ref < 1 + is_compound; ++ref) {
+    const MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];
+    RefBuffer *ref_buf = &cm->frame_refs[frame - LAST_FRAME];
+    xd->block_refs[ref] = ref_buf;
+    if ((!vp9_is_valid_scale(&ref_buf->sf)))
+      vpx_internal_error(xd->error_info, VPX_CODEC_UNSUP_BITSTREAM,
+                         "Reference frame has invalid dimensions");
+    vp9_setup_pre_planes(xd, ref, ref_buf->buf, mi_row, mi_col,
+                         &ref_buf->sf);
+    vp9_find_mv_refs(cm, xd, tile, mi, frame, mbmi->ref_mvs[frame],
+                     mi_row, mi_col, fpm_sync, (void *)pbi);
+  }
+
+  inter_mode_ctx = mbmi->mode_context[mbmi->ref_frame[0]];
+
+  if (vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
+    mbmi->mode = ZEROMV;
+    if (bsize < BLOCK_8X8) {
+        vpx_internal_error(xd->error_info, VPX_CODEC_UNSUP_BITSTREAM,
+                           "Invalid usage of segement feature on small blocks");
+        return;
+    }
+  } else {
+    if (bsize >= BLOCK_8X8)
+      mbmi->mode = read_inter_mode(cm, xd, r, inter_mode_ctx);
+  }
+
+  if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
+    for (ref = 0; ref < 1 + is_compound; ++ref) {
+      vp9_find_best_ref_mvs(xd, allow_hp, mbmi->ref_mvs[mbmi->ref_frame[ref]],
+                            &nearestmv[ref], &nearmv[ref]);
+    }
+  }
+
+  mbmi->interp_filter = (cm->interp_filter == SWITCHABLE)
+                      ? read_switchable_interp_filter(cm, xd, r)
+                      : cm->interp_filter;
+
+  if (bsize < BLOCK_8X8) {
+    const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];  // 1 or 2
+    const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];  // 1 or 2
+    int idx, idy;
+    PREDICTION_MODE b_mode;
+    int_mv nearest_sub8x8[2], near_sub8x8[2];
+    for (idy = 0; idy < 2; idy += num_4x4_h) {
+      for (idx = 0; idx < 2; idx += num_4x4_w) {
+        int_mv block[2];
+        const int j = idy * 2 + idx;
+        b_mode = read_inter_mode(cm, xd, r, inter_mode_ctx);
+
+        if (b_mode == NEARESTMV || b_mode == NEARMV)
+          for (ref = 0; ref < 1 + is_compound; ++ref)
+            vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, j, ref, mi_row, mi_col,
+                                          &nearest_sub8x8[ref],
+                                          &near_sub8x8[ref]);
+
+        if (!assign_mv(cm, xd, b_mode, block, nearestmv,
+                       nearest_sub8x8, near_sub8x8,
+                       is_compound, allow_hp, r)) {
+          xd->corrupted |= 1;
+          break;
+        };
+
+        mi->bmi[j].as_mv[0].as_int = block[0].as_int;
+        if (is_compound)
+          mi->bmi[j].as_mv[1].as_int = block[1].as_int;
+
+        if (num_4x4_h == 2)
+          mi->bmi[j + 2] = mi->bmi[j];
+        if (num_4x4_w == 2)
+          mi->bmi[j + 1] = mi->bmi[j];
+      }
+    }
+
+    mi->mbmi.mode = b_mode;
+
+    mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
+    mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
+  } else {
+    xd->corrupted |= !assign_mv(cm, xd, mbmi->mode, mbmi->mv, nearestmv,
+                                nearestmv, nearmv, is_compound, allow_hp, r);
+  }
+}
+
+static void read_inter_frame_mode_info(VP9Decoder *const pbi,
+                                       MACROBLOCKD *const xd,
+                                       const TileInfo *const tile,
+                                       int mi_row, int mi_col, vp9_reader *r) {
+  VP9_COMMON *const cm = &pbi->common;
+  MODE_INFO *const mi = xd->mi[0];
+  MB_MODE_INFO *const mbmi = &mi->mbmi;
+  int inter_block;
+
+  mbmi->mv[0].as_int = 0;
+  mbmi->mv[1].as_int = 0;
+  mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, r);
+  mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);
+  inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);
+  mbmi->tx_size = read_tx_size(cm, xd, !mbmi->skip || !inter_block, r);
+
+  if (inter_block)
+    read_inter_block_mode_info(pbi, xd, tile, mi, mi_row, mi_col, r);
+  else
+    read_intra_block_mode_info(cm, xd, mi, r);
+}
+
+void vp9_read_mode_info(VP9Decoder *const pbi, MACROBLOCKD *xd,
+                        const TileInfo *const tile,
+                        int mi_row, int mi_col, vp9_reader *r) {
+  VP9_COMMON *const cm = &pbi->common;
+  MODE_INFO *const mi = xd->mi[0];
+  const int bw = num_8x8_blocks_wide_lookup[mi->mbmi.sb_type];
+  const int bh = num_8x8_blocks_high_lookup[mi->mbmi.sb_type];
+  const int x_mis = MIN(bw, cm->mi_cols - mi_col);
+  const int y_mis = MIN(bh, cm->mi_rows - mi_row);
+  MV_REF* frame_mvs = cm->cur_frame->mvs + mi_row * cm->mi_cols + mi_col;
+  int w, h;
+
+  if (frame_is_intra_only(cm))
+    read_intra_frame_mode_info(cm, xd, mi_row, mi_col, r);
+  else
+    read_inter_frame_mode_info(pbi, xd, tile, mi_row, mi_col, r);
+
+  for (h = 0; h < y_mis; ++h) {
+    MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
+    for (w = 0; w < x_mis; ++w) {
+      MV_REF *const mv = frame_mv + w;
+      mv->ref_frame[0] = mi->mbmi.ref_frame[0];
+      mv->ref_frame[1] = mi->mbmi.ref_frame[1];
+      mv->mv[0].as_int = mi->mbmi.mv[0].as_int;
+      mv->mv[1].as_int = mi->mbmi.mv[1].as_int;
+    }
+  }
+}