summaryrefslogtreecommitdiffstats
path: root/media/libvpx/vp9/common/vp9_blockd.c
diff options
context:
space:
mode:
Diffstat (limited to 'media/libvpx/vp9/common/vp9_blockd.c')
-rw-r--r--media/libvpx/vp9/common/vp9_blockd.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/media/libvpx/vp9/common/vp9_blockd.c b/media/libvpx/vp9/common/vp9_blockd.c
new file mode 100644
index 000000000..b2bb18188
--- /dev/null
+++ b/media/libvpx/vp9/common/vp9_blockd.c
@@ -0,0 +1,135 @@
+/*
+ * 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->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 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->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 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 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));
+
+ // 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)) {
+ for (c = 0; c < num_4x4_w; c += (1 << tx_size)) {
+ // Skip visiting the sub blocks that are wholly within the UMV.
+ if (c < max_blocks_wide)
+ visit(plane, i, plane_bsize, tx_size, arg);
+ i += 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].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;
+ }
+}