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Diffstat (limited to 'media/libvpx/vp9/common/vp9_tile_common.c')
-rw-r--r--media/libvpx/vp9/common/vp9_tile_common.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/media/libvpx/vp9/common/vp9_tile_common.c b/media/libvpx/vp9/common/vp9_tile_common.c
new file mode 100644
index 000000000..7a20e0a9e
--- /dev/null
+++ b/media/libvpx/vp9/common/vp9_tile_common.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2010 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_tile_common.h"
+
+#include "vp9/common/vp9_onyxc_int.h"
+
+#define MIN_TILE_WIDTH_B64 4
+#define MAX_TILE_WIDTH_B64 64
+
+static int get_tile_offset(int idx, int mis, int log2) {
+ const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
+ const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
+ return MIN(offset, mis);
+}
+
+void vp9_tile_set_row(TileInfo *tile, const VP9_COMMON *cm, int row) {
+ tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
+ tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
+}
+
+void vp9_tile_set_col(TileInfo *tile, const VP9_COMMON *cm, int col) {
+ tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
+ tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
+}
+
+void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
+ vp9_tile_set_row(tile, cm, row);
+ vp9_tile_set_col(tile, cm, col);
+}
+
+static int get_min_log2_tile_cols(const int sb64_cols) {
+ int min_log2 = 0;
+ while ((MAX_TILE_WIDTH_B64 << min_log2) < sb64_cols)
+ ++min_log2;
+ return min_log2;
+}
+
+static int get_max_log2_tile_cols(const int sb64_cols) {
+ int max_log2 = 1;
+ while ((sb64_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
+ ++max_log2;
+ return max_log2 - 1;
+}
+
+void vp9_get_tile_n_bits(int mi_cols,
+ int *min_log2_tile_cols, int *max_log2_tile_cols) {
+ const int sb64_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
+ *min_log2_tile_cols = get_min_log2_tile_cols(sb64_cols);
+ *max_log2_tile_cols = get_max_log2_tile_cols(sb64_cols);
+ assert(*min_log2_tile_cols <= *max_log2_tile_cols);
+}