vp8/encoder/treewriter.c

   1 /*
   2  *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license and patent
   5  *  grant that can be found in the LICENSE file in the root of the source
   6  *  tree. All contributing project authors may be found in the AUTHORS
   7  *  file in the root of the source tree.
   8  */
   9
  10
  11 #include "treewriter.h"
  12
  13 static void cost(
  14     int *const C,
  15     vp8_tree T,
  16     const vp8_prob *const P,
  17     int i,
  18     int c
  19 )
  20 {
  21     const vp8_prob p = P [i>>1];
  22
  23     do
  24     {
  25         const vp8_tree_index j = T[i];
  26         const int d = c + vp8_cost_bit(p, i & 1);
  27
  28         if (j <= 0)
  29             C[-j] = d;
  30         else
  31             cost(C, T, P, j, d);
  32     }
  33     while (++i & 1);
  34 }
  35 void vp8_cost_tokens(int *c, const vp8_prob *p, vp8_tree t)
  36 {
  37     cost(c, t, p, 0, 0);
  38 }