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Side by Side Diff: source/libvpx/vp9/encoder/vp9_boolhuff.h

Issue 11555023: libvpx: Add VP9 decoder. (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/libvpx/
Patch Set: Created 8 years ago
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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 : vp9_boolhuff.h
15 *
16 * Description : Bool Coder header file.
17 *
18 ****************************************************************************/
19 #ifndef VP9_ENCODER_VP9_BOOLHUFF_H_
20 #define VP9_ENCODER_VP9_BOOLHUFF_H_
21
22 #include "vpx_ports/mem.h"
23
24 typedef struct {
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 vp9_start_encode(BOOL_CODER *bc, unsigned char *buffer);
38
39 extern void vp9_encode_value(BOOL_CODER *br, int data, int bits);
40 extern void vp9_encode_unsigned_max(BOOL_CODER *br, int data, int max);
41 extern void vp9_stop_encode(BOOL_CODER *bc);
42 extern const unsigned int vp9_prob_cost[256];
43
44 extern void vp9_encode_uniform(BOOL_CODER *bc, int v, int n);
45 extern void vp9_encode_term_subexp(BOOL_CODER *bc, int v, int k, int n);
46 extern int vp9_count_uniform(int v, int n);
47 extern int vp9_count_term_subexp(int v, int k, int n);
48 extern int vp9_recenter_nonneg(int v, int m);
49
50 DECLARE_ALIGNED(16, extern const unsigned char, vp9_norm[256]);
51
52
53 static void encode_bool(BOOL_CODER *br, int bit, int probability) {
54 unsigned int split;
55 int count = br->count;
56 unsigned int range = br->range;
57 unsigned int lowvalue = br->lowvalue;
58 register unsigned int shift;
59
60 #ifdef ENTROPY_STATS
61 #if defined(SECTIONBITS_OUTPUT)
62
63 if (bit)
64 Sectionbits[active_section] += vp9_prob_cost[255 - probability];
65 else
66 Sectionbits[active_section] += vp9_prob_cost[probability];
67
68 #endif
69 #endif
70
71 split = 1 + (((range - 1) * probability) >> 8);
72
73 range = split;
74
75 if (bit) {
76 lowvalue += split;
77 range = br->range - split;
78 }
79
80 shift = vp9_norm[range];
81
82 range <<= shift;
83 count += shift;
84
85 if (count >= 0) {
86 int offset = shift - count;
87
88 if ((lowvalue << (offset - 1)) & 0x80000000) {
89 int x = br->pos - 1;
90
91 while (x >= 0 && br->buffer[x] == 0xff) {
92 br->buffer[x] = (unsigned char)0;
93 x--;
94 }
95
96 br->buffer[x] += 1;
97 }
98
99 br->buffer[br->pos++] = (lowvalue >> (24 - offset));
100 lowvalue <<= offset;
101 shift = count;
102 lowvalue &= 0xffffff;
103 count -= 8;
104 }
105
106 lowvalue <<= shift;
107 br->count = count;
108 br->lowvalue = lowvalue;
109 br->range = range;
110 }
111
112 #endif
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