blockd.c 4.97 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/*
 *  Copyright (c) 2014 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.
 */

11
#include "vp10/common/blockd.h"
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

PREDICTION_MODE vp10_left_block_mode(const MODE_INFO *cur_mi,
                                    const MODE_INFO *left_mi, int b) {
  if (b == 0 || b == 2) {
    if (!left_mi || is_inter_block(&left_mi->mbmi))
      return DC_PRED;

    return get_y_mode(left_mi, b + 1);
  } else {
    assert(b == 1 || b == 3);
    return cur_mi->bmi[b - 1].as_mode;
  }
}

PREDICTION_MODE vp10_above_block_mode(const MODE_INFO *cur_mi,
                                     const MODE_INFO *above_mi, int b) {
  if (b == 0 || b == 1) {
    if (!above_mi || is_inter_block(&above_mi->mbmi))
      return DC_PRED;

    return get_y_mode(above_mi, b + 2);
  } else {
    assert(b == 2 || b == 3);
    return cur_mi->bmi[b - 2].as_mode;
  }
}

void vp10_foreach_transformed_block_in_plane(
    const MACROBLOCKD *const xd, BLOCK_SIZE bsize, int plane,
    foreach_transformed_block_visitor visit, void *arg) {
  const struct macroblockd_plane *const pd = &xd->plane[plane];
  const MB_MODE_INFO* mbmi = &xd->mi[0]->mbmi;
  // block and transform sizes, in number of 4x4 blocks log 2 ("*_b")
  // 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8
  // transform size varies per plane, look it up in a common way.
  const TX_SIZE tx_size = plane ? get_uv_tx_size(mbmi, pd)
                                : mbmi->tx_size;
  const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, 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];
  const int step = 1 << (tx_size << 1);
  int i = 0, r, c;

  // If mb_to_right_edge is < 0 we are in a situation in which
  // the current block size extends into the UMV and we won't
  // visit the sub blocks that are wholly within the UMV.
  const int max_blocks_wide = num_4x4_w + (xd->mb_to_right_edge >= 0 ? 0 :
      xd->mb_to_right_edge >> (5 + pd->subsampling_x));
  const int max_blocks_high = num_4x4_h + (xd->mb_to_bottom_edge >= 0 ? 0 :
      xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
  const int extra_step = ((num_4x4_w - max_blocks_wide) >> tx_size) * step;

  // Keep track of the row and column of the blocks we use so that we know
  // if we are in the unrestricted motion border.
  for (r = 0; r < max_blocks_high; r += (1 << tx_size)) {
    // Skip visiting the sub blocks that are wholly within the UMV.
    for (c = 0; c < max_blocks_wide; c += (1 << tx_size)) {
69
      visit(plane, i, r, c, plane_bsize, tx_size, arg);
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
      i += step;
    }
    i += extra_step;
  }
}

void vp10_foreach_transformed_block(const MACROBLOCKD* const xd,
                                   BLOCK_SIZE bsize,
                                   foreach_transformed_block_visitor visit,
                                   void *arg) {
  int plane;

  for (plane = 0; plane < MAX_MB_PLANE; ++plane)
    vp10_foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg);
}

void vp10_set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
                      BLOCK_SIZE plane_bsize, TX_SIZE tx_size, int has_eob,
                      int aoff, int loff) {
  ENTROPY_CONTEXT *const a = pd->above_context + aoff;
  ENTROPY_CONTEXT *const l = pd->left_context + loff;
  const int tx_size_in_blocks = 1 << tx_size;

  // above
  if (has_eob && xd->mb_to_right_edge < 0) {
    int i;
    const int blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize] +
                            (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
    int above_contexts = tx_size_in_blocks;
    if (above_contexts + aoff > blocks_wide)
      above_contexts = blocks_wide - aoff;

    for (i = 0; i < above_contexts; ++i)
      a[i] = has_eob;
    for (i = above_contexts; i < tx_size_in_blocks; ++i)
      a[i] = 0;
  } else {
    memset(a, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
  }

  // left
  if (has_eob && xd->mb_to_bottom_edge < 0) {
    int i;
    const int blocks_high = num_4x4_blocks_high_lookup[plane_bsize] +
                            (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
    int left_contexts = tx_size_in_blocks;
    if (left_contexts + loff > blocks_high)
      left_contexts = blocks_high - loff;

    for (i = 0; i < left_contexts; ++i)
      l[i] = has_eob;
    for (i = left_contexts; i < tx_size_in_blocks; ++i)
      l[i] = 0;
  } else {
    memset(l, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
  }
}

void vp10_setup_block_planes(MACROBLOCKD *xd, int ss_x, int ss_y) {
  int i;

  for (i = 0; i < MAX_MB_PLANE; i++) {
    xd->plane[i].plane_type = i ? PLANE_TYPE_UV : PLANE_TYPE_Y;
    xd->plane[i].subsampling_x = i ? ss_x : 0;
    xd->plane[i].subsampling_y = i ? ss_y : 0;
  }
}