media/libvpx/vp8/decoder/treereader.h@b8a032363ba2 (annotated)
media/libvpx/vp8/decoder/treereader.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license |
| michael@0 | 5 | * that can be found in the LICENSE file in the root of the source |
| michael@0 | 6 | * tree. An additional intellectual property rights grant can be found |
| michael@0 | 7 | * in the file PATENTS. All contributing project authors may |
| michael@0 | 8 | * be found in the AUTHORS file in the root of the source tree. |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | |
| michael@0 | 12 | #ifndef TREEREADER_H_ |
| michael@0 | 13 | #define TREEREADER_H_ |
| michael@0 | 14 | |
| michael@0 | 15 | #include "vp8/common/treecoder.h" |
| michael@0 | 16 | #include "dboolhuff.h" |
| michael@0 | 17 | |
| michael@0 | 18 | typedef BOOL_DECODER vp8_reader; |
| michael@0 | 19 | |
| michael@0 | 20 | #define vp8_read vp8dx_decode_bool |
| michael@0 | 21 | #define vp8_read_literal vp8_decode_value |
| michael@0 | 22 | #define vp8_read_bit(R) vp8_read(R, vp8_prob_half) |
| michael@0 | 23 | |
| michael@0 | 24 | |
| michael@0 | 25 | /* Intent of tree data structure is to make decoding trivial. */ |
| michael@0 | 26 | |
| michael@0 | 27 | static int vp8_treed_read( |
| michael@0 | 28 | vp8_reader *const r, /* !!! must return a 0 or 1 !!! */ |
| michael@0 | 29 | vp8_tree t, |
| michael@0 | 30 | const vp8_prob *const p |
| michael@0 | 31 | ) |
| michael@0 | 32 | { |
| michael@0 | 33 | register vp8_tree_index i = 0; |
| michael@0 | 34 | |
| michael@0 | 35 | while ((i = t[ i + vp8_read(r, p[i>>1])]) > 0) ; |
| michael@0 | 36 | |
| michael@0 | 37 | return -i; |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | #endif // TREEREADER_H_ |
