ref: a28d43658e3347d55d70655e6ee3d87d0d3fba8a
dir: /vp9/common/vp9_blockd.c/
/* * 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. */ #include "vp9/common/vp9_blockd.h" PREDICTION_MODE vp9_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)) 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 vp9_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)) 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 vp9_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 MODE_INFO *mi = xd->mi[0]; // 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(mi, pd) : mi->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)) { visit(plane, i, r, c, plane_bsize, tx_size, arg); i += step; } i += extra_step; } } void vp9_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) vp9_foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg); } void vp9_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 vp9_setup_block_planes(MACROBLOCKD *xd, int ss_x, int ss_y) { int i; for (i = 0; i < MAX_MB_PLANE; i++) { xd->plane[i].subsampling_x = i ? ss_x : 0; xd->plane[i].subsampling_y = i ? ss_y : 0; } }