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 #ifndef VP9_COMMON_VP9_ENTROPYMV_H_
13 #define VP9_COMMON_VP9_ENTROPYMV_H_
14
15 #include "./vpx_config.h"
16
17 #include "vpx_dsp/prob.h"
18
19 #include "vp9/common/vp9_mv.h"
20
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24
25 struct VP9Common;
26
27 void vp9_init_mv_probs(struct VP9Common *cm);
28
29 void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
30
31 // Integer pel reference mv threshold for use of high-precision 1/8 mv
32 #define COMPANDED_MVREF_THRESH 8
33
use_mv_hp(const MV * ref)34 static INLINE int use_mv_hp(const MV *ref) {
35 return (abs(ref->row) >> 3) < COMPANDED_MVREF_THRESH &&
36 (abs(ref->col) >> 3) < COMPANDED_MVREF_THRESH;
37 }
38
39 #define MV_UPDATE_PROB 252
40
41 /* Symbols for coding which components are zero jointly */
42 #define MV_JOINTS 4
43 typedef enum {
44 MV_JOINT_ZERO = 0, /* Zero vector */
45 MV_JOINT_HNZVZ = 1, /* Vert zero, hor nonzero */
46 MV_JOINT_HZVNZ = 2, /* Hor zero, vert nonzero */
47 MV_JOINT_HNZVNZ = 3, /* Both components nonzero */
48 } MV_JOINT_TYPE;
49
mv_joint_vertical(MV_JOINT_TYPE type)50 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
51 return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
52 }
53
mv_joint_horizontal(MV_JOINT_TYPE type)54 static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
55 return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
56 }
57
58 /* Symbols for coding magnitude class of nonzero components */
59 #define MV_CLASSES 11
60 typedef enum {
61 MV_CLASS_0 = 0, /* (0, 2] integer pel */
62 MV_CLASS_1 = 1, /* (2, 4] integer pel */
63 MV_CLASS_2 = 2, /* (4, 8] integer pel */
64 MV_CLASS_3 = 3, /* (8, 16] integer pel */
65 MV_CLASS_4 = 4, /* (16, 32] integer pel */
66 MV_CLASS_5 = 5, /* (32, 64] integer pel */
67 MV_CLASS_6 = 6, /* (64, 128] integer pel */
68 MV_CLASS_7 = 7, /* (128, 256] integer pel */
69 MV_CLASS_8 = 8, /* (256, 512] integer pel */
70 MV_CLASS_9 = 9, /* (512, 1024] integer pel */
71 MV_CLASS_10 = 10, /* (1024,2048] integer pel */
72 } MV_CLASS_TYPE;
73
74 #define CLASS0_BITS 1 /* bits at integer precision for class 0 */
75 #define CLASS0_SIZE (1 << CLASS0_BITS)
76 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
77 #define MV_FP_SIZE 4
78
79 #define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
80 #define MV_MAX ((1 << MV_MAX_BITS) - 1)
81 #define MV_VALS ((MV_MAX << 1) + 1)
82
83 #define MV_IN_USE_BITS 14
84 #define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
85 #define MV_LOW (-(1 << MV_IN_USE_BITS))
86
87 extern const vpx_tree_index vp9_mv_joint_tree[];
88 extern const vpx_tree_index vp9_mv_class_tree[];
89 extern const vpx_tree_index vp9_mv_class0_tree[];
90 extern const vpx_tree_index vp9_mv_fp_tree[];
91
92 typedef struct {
93 vpx_prob sign;
94 vpx_prob classes[MV_CLASSES - 1];
95 vpx_prob class0[CLASS0_SIZE - 1];
96 vpx_prob bits[MV_OFFSET_BITS];
97 vpx_prob class0_fp[CLASS0_SIZE][MV_FP_SIZE - 1];
98 vpx_prob fp[MV_FP_SIZE - 1];
99 vpx_prob class0_hp;
100 vpx_prob hp;
101 } nmv_component;
102
103 typedef struct {
104 vpx_prob joints[MV_JOINTS - 1];
105 nmv_component comps[2];
106 } nmv_context;
107
vp9_get_mv_joint(const MV * mv)108 static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
109 if (mv->row == 0) {
110 return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
111 } else {
112 return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
113 }
114 }
115
116 MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
117
118 typedef struct {
119 unsigned int sign[2];
120 unsigned int classes[MV_CLASSES];
121 unsigned int class0[CLASS0_SIZE];
122 unsigned int bits[MV_OFFSET_BITS][2];
123 unsigned int class0_fp[CLASS0_SIZE][MV_FP_SIZE];
124 unsigned int fp[MV_FP_SIZE];
125 unsigned int class0_hp[2];
126 unsigned int hp[2];
127 } nmv_component_counts;
128
129 typedef struct {
130 unsigned int joints[MV_JOINTS];
131 nmv_component_counts comps[2];
132 } nmv_context_counts;
133
134 void vp9_inc_mv(const MV *mv, nmv_context_counts *mvctx);
135
136 #ifdef __cplusplus
137 } // extern "C"
138 #endif
139
140 #endif // VP9_COMMON_VP9_ENTROPYMV_H_
141