1 files changed, 33 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/encoder/treewriter.c b/media/libvpx/libvpx/vp8/encoder/treewriter.c
new file mode 100644
index 0000000000..f055f05229
--- /dev/null
+++ b/media/libvpx/libvpx/vp8/encoder/treewriter.c
@@ -0,0 +1,33 @@
+/*
+ *  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 "treewriter.h"
+
+static void cost(int *const C, vp8_tree T, const vp8_prob *const P, int i,
+                 int c) {
+  const vp8_prob p = P[i >> 1];
+
+  do {
+    const vp8_tree_index j = T[i];
+    const int d = c + vp8_cost_bit(p, i & 1);
+
+    if (j <= 0) {
+      C[-j] = d;
+    } else {
+      cost(C, T, P, j, d);
+    }
+  } while (++i & 1);
+}
+void vp8_cost_tokens(int *c, const vp8_prob *p, vp8_tree t) {
+  cost(c, t, p, 0, 0);
+}
+void vp8_cost_tokens2(int *c, const vp8_prob *p, vp8_tree t, int start) {
+  cost(c, t, p, start, 0);
+}