1 /* 2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "vp9/common/vp9_blockd.h" 12 13 PREDICTION_MODE vp9_left_block_mode(const MODE_INFO *cur_mi, 14 const MODE_INFO *left_mi, int b) { 15 if (b == 0 || b == 2) { 16 if (!left_mi || is_inter_block(left_mi)) return DC_PRED; 17 18 return get_y_mode(left_mi, b + 1); 19 } else { 20 assert(b == 1 || b == 3); 21 return cur_mi->bmi[b - 1].as_mode; 22 } 23 } 24 25 PREDICTION_MODE vp9_above_block_mode(const MODE_INFO *cur_mi, 26 const MODE_INFO *above_mi, int b) { 27 if (b == 0 || b == 1) { 28 if (!above_mi || is_inter_block(above_mi)) return DC_PRED; 29 30 return get_y_mode(above_mi, b + 2); 31 } else { 32 assert(b == 2 || b == 3); 33 return cur_mi->bmi[b - 2].as_mode; 34 } 35 } 36 37 void vp9_foreach_transformed_block_in_plane( 38 const MACROBLOCKD *const xd, BLOCK_SIZE bsize, int plane, 39 foreach_transformed_block_visitor visit, void *arg) { 40 const struct macroblockd_plane *const pd = &xd->plane[plane]; 41 const MODE_INFO *mi = xd->mi[0]; 42 // block and transform sizes, in number of 4x4 blocks log 2 ("*_b") 43 // 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8 44 // transform size varies per plane, look it up in a common way. 45 const TX_SIZE tx_size = plane ? get_uv_tx_size(mi, pd) : mi->tx_size; 46 const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd); 47 const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize]; 48 const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize]; 49 const int step = 1 << (tx_size << 1); 50 int i = 0, r, c; 51 52 // If mb_to_right_edge is < 0 we are in a situation in which 53 // the current block size extends into the UMV and we won't 54 // visit the sub blocks that are wholly within the UMV. 55 const int max_blocks_wide = 56 num_4x4_w + (xd->mb_to_right_edge >= 0 57 ? 0 58 : xd->mb_to_right_edge >> (5 + pd->subsampling_x)); 59 const int max_blocks_high = 60 num_4x4_h + (xd->mb_to_bottom_edge >= 0 61 ? 0 62 : xd->mb_to_bottom_edge >> (5 + pd->subsampling_y)); 63 const int extra_step = ((num_4x4_w - max_blocks_wide) >> tx_size) * step; 64 65 // Keep track of the row and column of the blocks we use so that we know 66 // if we are in the unrestricted motion border. 67 for (r = 0; r < max_blocks_high; r += (1 << tx_size)) { 68 // Skip visiting the sub blocks that are wholly within the UMV. 69 for (c = 0; c < max_blocks_wide; c += (1 << tx_size)) { 70 visit(plane, i, r, c, plane_bsize, tx_size, arg); 71 i += step; 72 } 73 i += extra_step; 74 } 75 } 76 77 void vp9_foreach_transformed_block(const MACROBLOCKD *const xd, 78 BLOCK_SIZE bsize, 79 foreach_transformed_block_visitor visit, 80 void *arg) { 81 int plane; 82 83 for (plane = 0; plane < MAX_MB_PLANE; ++plane) 84 vp9_foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg); 85 } 86 87 void vp9_set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd, 88 BLOCK_SIZE plane_bsize, TX_SIZE tx_size, int has_eob, 89 int aoff, int loff) { 90 ENTROPY_CONTEXT *const a = pd->above_context + aoff; 91 ENTROPY_CONTEXT *const l = pd->left_context + loff; 92 const int tx_size_in_blocks = 1 << tx_size; 93 94 // above 95 if (has_eob && xd->mb_to_right_edge < 0) { 96 int i; 97 const int blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize] + 98 (xd->mb_to_right_edge >> (5 + pd->subsampling_x)); 99 int above_contexts = tx_size_in_blocks; 100 if (above_contexts + aoff > blocks_wide) 101 above_contexts = blocks_wide - aoff; 102 103 for (i = 0; i < above_contexts; ++i) a[i] = has_eob; 104 for (i = above_contexts; i < tx_size_in_blocks; ++i) a[i] = 0; 105 } else { 106 memset(a, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks); 107 } 108 109 // left 110 if (has_eob && xd->mb_to_bottom_edge < 0) { 111 int i; 112 const int blocks_high = num_4x4_blocks_high_lookup[plane_bsize] + 113 (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y)); 114 int left_contexts = tx_size_in_blocks; 115 if (left_contexts + loff > blocks_high) left_contexts = blocks_high - loff; 116 117 for (i = 0; i < left_contexts; ++i) l[i] = has_eob; 118 for (i = left_contexts; i < tx_size_in_blocks; ++i) l[i] = 0; 119 } else { 120 memset(l, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks); 121 } 122 } 123 124 void vp9_setup_block_planes(MACROBLOCKD *xd, int ss_x, int ss_y) { 125 int i; 126 127 for (i = 0; i < MAX_MB_PLANE; i++) { 128 xd->plane[i].subsampling_x = i ? ss_x : 0; 129 xd->plane[i].subsampling_y = i ? ss_y : 0; 130 } 131 } 132
