1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libvpx/vp8/decoder/treereader.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,40 @@
1.4 +/*
1.5 + * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +
1.15 +#ifndef TREEREADER_H_
1.16 +#define TREEREADER_H_
1.17 +
1.18 +#include "vp8/common/treecoder.h"
1.19 +#include "dboolhuff.h"
1.20 +
1.21 +typedef BOOL_DECODER vp8_reader;
1.22 +
1.23 +#define vp8_read vp8dx_decode_bool
1.24 +#define vp8_read_literal vp8_decode_value
1.25 +#define vp8_read_bit(R) vp8_read(R, vp8_prob_half)
1.26 +
1.27 +
1.28 +/* Intent of tree data structure is to make decoding trivial. */
1.29 +
1.30 +static int vp8_treed_read(
1.31 + vp8_reader *const r, /* !!! must return a 0 or 1 !!! */
1.32 + vp8_tree t,
1.33 + const vp8_prob *const p
1.34 +)
1.35 +{
1.36 + register vp8_tree_index i = 0;
1.37 +
1.38 + while ((i = t[ i + vp8_read(r, p[i>>1])]) > 0) ;
1.39 +
1.40 + return -i;
1.41 +}
1.42 +
1.43 +#endif // TREEREADER_H_
