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 /*

  *  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/encoder/vp9_treewriter.h"

 static void cost(int *costs, vp9_tree tree, const vp9_prob *probs,

                  int i, int c) {

   const vp9_prob prob = probs[i / 2];

   int b;

   for (b = 0; b <= 1; ++b) {

     const int cc = c + vp9_cost_bit(prob, b);

     const vp9_tree_index ii = tree[i + b];

     if (ii <= 0)

       costs[-ii] = cc;

     else

       cost(costs, tree, probs, ii, cc);

   }

 }

 void vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree) {

   cost(costs, tree, probs, 0, 0);

 }

 void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree) {

   assert(tree[0] <= 0 && tree[1] > 0);

   costs[-tree[0]] = vp9_cost_bit(probs[0], 0);

   cost(costs, tree, probs, 2, 0);

 }