Line data    Source code

       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             : #ifndef VP8_DECODER_TREEREADER_H_
      12             : #define VP8_DECODER_TREEREADER_H_
      13             : 
      14             : #include "./vpx_config.h"
      15             : #include "vp8/common/treecoder.h"
      16             : #include "dboolhuff.h"
      17             : 
      18             : #ifdef __cplusplus
      19             : extern "C" {
      20             : #endif
      21             : 
      22             : typedef BOOL_DECODER vp8_reader;
      23             : 
      24             : #define vp8_read vp8dx_decode_bool
      25             : #define vp8_read_literal vp8_decode_value
      26             : #define vp8_read_bit(R) vp8_read(R, vp8_prob_half)
      27             : 
      28             : /* Intent of tree data structure is to make decoding trivial. */
      29             : 
      30           0 : static INLINE int vp8_treed_read(
      31             :     vp8_reader *const r, /* !!! must return a 0 or 1 !!! */
      32             :     vp8_tree t, const vp8_prob *const p) {
      33           0 :   register vp8_tree_index i = 0;
      34             : 
      35           0 :   while ((i = t[i + vp8_read(r, p[i >> 1])]) > 0) {
      36             :   }
      37             : 
      38           0 :   return -i;
      39             : }
      40             : 
      41             : #ifdef __cplusplus
      42             : }  // extern "C"
      43             : #endif
      44             : 
      45             : #endif  // VP8_DECODER_TREEREADER_H_