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 VPX_VP8_DECODER_TREEREADER_H_ 12 #define VPX_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 vp8_treed_read(vp8_reader * const r,vp8_tree t,const vp8_prob * const p)30static 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 vp8_tree_index i = 0; 34 35 while ((i = t[i + vp8_read(r, p[i >> 1])]) > 0) { 36 } 37 38 return -i; 39 } 40 41 #ifdef __cplusplus 42 } // extern "C" 43 #endif 44 45 #endif // VPX_VP8_DECODER_TREEREADER_H_ 46