167 строки
6.2 KiB
C
167 строки
6.2 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <math.h>
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#include "aom_ports/system_state.h"
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#include "av1/common/blockd.h"
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PREDICTION_MODE av1_left_block_mode(const MODE_INFO *cur_mi,
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const MODE_INFO *left_mi, int b) {
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if (b == 0 || b == 2) {
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if (!left_mi || is_inter_block(&left_mi->mbmi)) return DC_PRED;
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return get_y_mode(left_mi, b + 1);
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} else {
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assert(b == 1 || b == 3);
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return cur_mi->bmi[b - 1].as_mode;
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}
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}
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PREDICTION_MODE av1_above_block_mode(const MODE_INFO *cur_mi,
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const MODE_INFO *above_mi, int b) {
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if (b == 0 || b == 1) {
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if (!above_mi || is_inter_block(&above_mi->mbmi)) return DC_PRED;
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return get_y_mode(above_mi, b + 2);
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} else {
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assert(b == 2 || b == 3);
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return cur_mi->bmi[b - 2].as_mode;
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}
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}
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void av1_foreach_transformed_block_in_plane(
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const MACROBLOCKD *const xd, BLOCK_SIZE bsize, int plane,
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foreach_transformed_block_visitor visit, void *arg) {
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const struct macroblockd_plane *const pd = &xd->plane[plane];
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const MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
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// block and transform sizes, in number of 4x4 blocks log 2 ("*_b")
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// 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8
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// transform size varies per plane, look it up in a common way.
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const TX_SIZE tx_size = plane ? get_uv_tx_size(mbmi, pd) : mbmi->tx_size;
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const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
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const int num_4x4_w = block_size_wide[plane_bsize];
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const int num_4x4_h = block_size_high[plane_bsize];
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const uint8_t txw_unit = tx_size_wide_unit[tx_size];
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const uint8_t txh_unit = tx_size_high_unit[tx_size];
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const int step = txw_unit * txh_unit;
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int i = 0, r, c;
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// If mb_to_right_edge is < 0 we are in a situation in which
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// the current block size extends into the UMV and we won't
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// visit the sub blocks that are wholly within the UMV.
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int max_blocks_wide =
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num_4x4_w + (xd->mb_to_right_edge >= 0 ? 0 : xd->mb_to_right_edge >>
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(3 + pd->subsampling_x));
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int max_blocks_high =
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num_4x4_h + (xd->mb_to_bottom_edge >= 0
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? 0
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: xd->mb_to_bottom_edge >> (3 + pd->subsampling_y));
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const int extra_step =
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((num_4x4_w - max_blocks_wide) >> tx_size_wide_log2[tx_size]) * step;
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// Scale to the transform block unit.
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max_blocks_wide >>= tx_size_wide_log2[0];
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max_blocks_high >>= tx_size_high_log2[0];
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// Keep track of the row and column of the blocks we use so that we know
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// if we are in the unrestricted motion border.
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for (r = 0; r < max_blocks_high; r += txh_unit) {
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// Skip visiting the sub blocks that are wholly within the UMV.
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for (c = 0; c < max_blocks_wide; c += txw_unit) {
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visit(plane, i, r, c, plane_bsize, tx_size, arg);
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i += step;
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}
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i += extra_step;
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}
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}
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void av1_foreach_transformed_block(const MACROBLOCKD *const xd,
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BLOCK_SIZE bsize,
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foreach_transformed_block_visitor visit,
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void *arg) {
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int plane;
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for (plane = 0; plane < MAX_MB_PLANE; ++plane)
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av1_foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg);
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}
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void av1_set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
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TX_SIZE tx_size, int has_eob, int aoff, int loff) {
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ENTROPY_CONTEXT *const a = pd->above_context + aoff;
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ENTROPY_CONTEXT *const l = pd->left_context + loff;
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const int txs_wide = tx_size_wide_unit[tx_size];
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const int txs_high = tx_size_high_unit[tx_size];
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// above
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if (has_eob && xd->mb_to_right_edge < 0) {
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int i;
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const int blocks_wide =
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pd->n4_w + (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
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int above_contexts = txs_wide;
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if (above_contexts + aoff > blocks_wide)
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above_contexts = blocks_wide - aoff;
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for (i = 0; i < above_contexts; ++i) a[i] = has_eob;
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for (i = above_contexts; i < txs_wide; ++i) a[i] = 0;
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} else {
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memset(a, has_eob, sizeof(ENTROPY_CONTEXT) * txs_wide);
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}
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// left
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if (has_eob && xd->mb_to_bottom_edge < 0) {
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int i;
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const int blocks_high =
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pd->n4_h + (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
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int left_contexts = txs_high;
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if (left_contexts + loff > blocks_high) left_contexts = blocks_high - loff;
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for (i = 0; i < left_contexts; ++i) l[i] = has_eob;
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for (i = left_contexts; i < txs_high; ++i) l[i] = 0;
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} else {
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memset(l, has_eob, sizeof(ENTROPY_CONTEXT) * txs_high);
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}
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}
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void av1_setup_block_planes(MACROBLOCKD *xd, int ss_x, int ss_y) {
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int i;
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for (i = 0; i < MAX_MB_PLANE; i++) {
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xd->plane[i].plane_type = i ? PLANE_TYPE_UV : PLANE_TYPE_Y;
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xd->plane[i].subsampling_x = i ? ss_x : 0;
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xd->plane[i].subsampling_y = i ? ss_y : 0;
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}
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}
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#if CONFIG_EXT_INTRA
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const int16_t dr_intra_derivative[90] = {
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1, 14666, 7330, 4884, 3660, 2926, 2435, 2084, 1821, 1616, 1451, 1317, 1204,
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1108, 1026, 955, 892, 837, 787, 743, 703, 666, 633, 603, 574, 548,
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524, 502, 481, 461, 443, 426, 409, 394, 379, 365, 352, 339, 327,
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316, 305, 294, 284, 274, 265, 256, 247, 238, 230, 222, 214, 207,
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200, 192, 185, 179, 172, 166, 159, 153, 147, 141, 136, 130, 124,
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119, 113, 108, 103, 98, 93, 88, 83, 78, 73, 68, 63, 59,
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54, 49, 45, 40, 35, 31, 26, 22, 17, 13, 8, 4,
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};
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int av1_is_intra_filter_switchable(int angle) {
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assert(angle > 0 && angle < 270);
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if (angle % 45 == 0) return 0;
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if (angle > 90 && angle < 180) {
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return 1;
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} else {
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return ((angle < 90 ? dr_intra_derivative[angle]
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: dr_intra_derivative[270 - angle]) &
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0xFF) > 0;
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}
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}
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#endif // CONFIG_EXT_INTRA
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