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-rw-r--r--media/libaom/src/av1/common/obmc.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/media/libaom/src/av1/common/obmc.h b/media/libaom/src/av1/common/obmc.h
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+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_AV1_COMMON_OBMC_H_
+#define AOM_AV1_COMMON_OBMC_H_
+
+typedef void (*overlappable_nb_visitor_t)(MACROBLOCKD *xd, int rel_mi_pos,
+ uint8_t nb_mi_size,
+ MB_MODE_INFO *nb_mi, void *fun_ctxt,
+ const int num_planes);
+
+static INLINE void foreach_overlappable_nb_above(const AV1_COMMON *cm,
+ MACROBLOCKD *xd, int mi_col,
+ int nb_max,
+ overlappable_nb_visitor_t fun,
+ void *fun_ctxt) {
+ const int num_planes = av1_num_planes(cm);
+ if (!xd->up_available) return;
+
+ int nb_count = 0;
+
+ // prev_row_mi points into the mi array, starting at the beginning of the
+ // previous row.
+ MB_MODE_INFO **prev_row_mi = xd->mi - mi_col - 1 * xd->mi_stride;
+ const int end_col = AOMMIN(mi_col + xd->n4_w, cm->mi_cols);
+ uint8_t mi_step;
+ for (int above_mi_col = mi_col; above_mi_col < end_col && nb_count < nb_max;
+ above_mi_col += mi_step) {
+ MB_MODE_INFO **above_mi = prev_row_mi + above_mi_col;
+ mi_step =
+ AOMMIN(mi_size_wide[above_mi[0]->sb_type], mi_size_wide[BLOCK_64X64]);
+ // If we're considering a block with width 4, it should be treated as
+ // half of a pair of blocks with chroma information in the second. Move
+ // above_mi_col back to the start of the pair if needed, set above_mbmi
+ // to point at the block with chroma information, and set mi_step to 2 to
+ // step over the entire pair at the end of the iteration.
+ if (mi_step == 1) {
+ above_mi_col &= ~1;
+ above_mi = prev_row_mi + above_mi_col + 1;
+ mi_step = 2;
+ }
+ if (is_neighbor_overlappable(*above_mi)) {
+ ++nb_count;
+ fun(xd, above_mi_col - mi_col, AOMMIN(xd->n4_w, mi_step), *above_mi,
+ fun_ctxt, num_planes);
+ }
+ }
+}
+
+static INLINE void foreach_overlappable_nb_left(const AV1_COMMON *cm,
+ MACROBLOCKD *xd, int mi_row,
+ int nb_max,
+ overlappable_nb_visitor_t fun,
+ void *fun_ctxt) {
+ const int num_planes = av1_num_planes(cm);
+ if (!xd->left_available) return;
+
+ int nb_count = 0;
+
+ // prev_col_mi points into the mi array, starting at the top of the
+ // previous column
+ MB_MODE_INFO **prev_col_mi = xd->mi - 1 - mi_row * xd->mi_stride;
+ const int end_row = AOMMIN(mi_row + xd->n4_h, cm->mi_rows);
+ uint8_t mi_step;
+ for (int left_mi_row = mi_row; left_mi_row < end_row && nb_count < nb_max;
+ left_mi_row += mi_step) {
+ MB_MODE_INFO **left_mi = prev_col_mi + left_mi_row * xd->mi_stride;
+ mi_step =
+ AOMMIN(mi_size_high[left_mi[0]->sb_type], mi_size_high[BLOCK_64X64]);
+ if (mi_step == 1) {
+ left_mi_row &= ~1;
+ left_mi = prev_col_mi + (left_mi_row + 1) * xd->mi_stride;
+ mi_step = 2;
+ }
+ if (is_neighbor_overlappable(*left_mi)) {
+ ++nb_count;
+ fun(xd, left_mi_row - mi_row, AOMMIN(xd->n4_h, mi_step), *left_mi,
+ fun_ctxt, num_planes);
+ }
+ }
+}
+
+#endif // AOM_AV1_COMMON_OBMC_H_