vp8/encoder/boolhuff.h

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 /****************************************************************************
  13 *
  14 *   Module Title :     boolhuff.h
  15 *
  16 *   Description  :     Bool Coder header file.
  17 *
  18 ****************************************************************************/
  19 #ifndef __INC_BOOLHUFF_H
  20 #define __INC_BOOLHUFF_H
  21
  22
  23 typedef struct
  24 {
  25     unsigned int lowvalue;
  26     unsigned int range;
  27     unsigned int value;
  28     int count;
  29     unsigned int pos;
  30     unsigned char *buffer;
  31
  32     // Variables used to track bit costs without outputing to the bitstream
  33     unsigned int  measure_cost;
  34     unsigned long bit_counter;
  35 } BOOL_CODER;
  36
  37 extern void vp8_start_encode(BOOL_CODER *bc, unsigned char *buffer);
  38 extern void vp8_encode_bool(BOOL_CODER *bc, int x, int context);
  39 extern void vp8_encode_value(BOOL_CODER *br, int data, int bits);
  40 extern void vp8_stop_encode(BOOL_CODER *bc);
  41 extern const unsigned int vp8_prob_cost[256];
  42
  43 #endif