1 files changed, 63 insertions, 0 deletions
diff --git a/vp10/common/seg_common.c b/vp10/common/seg_common.c
new file mode 100644
index 000000000..1bf09b9a0
--- /dev/null
+++ b/vp10/common/seg_common.c
@@ -0,0 +1,63 @@
+/*
+ *  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 <assert.h>
+
+#include "vp10/common/blockd.h"
+#include "vp10/common/loopfilter.h"
+#include "vp10/common/seg_common.h"
+#include "vp10/common/quant_common.h"
+
+static const int seg_feature_data_signed[SEG_LVL_MAX] = { 1, 1, 0, 0 };
+
+static const int seg_feature_data_max[SEG_LVL_MAX] = {
+  MAXQ, MAX_LOOP_FILTER, 3, 0 };
+
+// These functions provide access to new segment level features.
+// Eventually these function may be "optimized out" but for the moment,
+// the coding mechanism is still subject to change so these provide a
+// convenient single point of change.
+
+void vp10_clearall_segfeatures(struct segmentation *seg) {
+  vp10_zero(seg->feature_data);
+  vp10_zero(seg->feature_mask);
+}
+
+void vp10_enable_segfeature(struct segmentation *seg, int segment_id,
+                           SEG_LVL_FEATURES feature_id) {
+  seg->feature_mask[segment_id] |= 1 << feature_id;
+}
+
+int vp10_seg_feature_data_max(SEG_LVL_FEATURES feature_id) {
+  return seg_feature_data_max[feature_id];
+}
+
+int vp10_is_segfeature_signed(SEG_LVL_FEATURES feature_id) {
+  return seg_feature_data_signed[feature_id];
+}
+
+void vp10_set_segdata(struct segmentation *seg, int segment_id,
+                     SEG_LVL_FEATURES feature_id, int seg_data) {
+  assert(seg_data <= seg_feature_data_max[feature_id]);
+  if (seg_data < 0) {
+    assert(seg_feature_data_signed[feature_id]);
+    assert(-seg_data <= seg_feature_data_max[feature_id]);
+  }
+
+  seg->feature_data[segment_id][feature_id] = seg_data;
+}
+
+const vpx_tree_index vp10_segment_tree[TREE_SIZE(MAX_SEGMENTS)] = {
+  2,  4,  6,  8, 10, 12,
+  0, -1, -2, -3, -4, -5, -6, -7
+};
+
+
+// TBD? Functions to read and write segment data with range / validity checking