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 #include "vp9/common/vp9_blockd.h"
17
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21
22 struct VP9Common;
23
24 void vp9_init_mv_probs(struct VP9Common *cm);
25
26 void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
27 int vp9_use_mv_hp(const MV *ref);
28
29 #define MV_UPDATE_PROB 252
30
31 /* Symbols for coding which components are zero jointly */
32 #define MV_JOINTS 4
33 typedef enum {
34 MV_JOINT_ZERO = 0, /* Zero vector */
35 MV_JOINT_HNZVZ = 1, /* Vert zero, hor nonzero */
36 MV_JOINT_HZVNZ = 2, /* Hor zero, vert nonzero */
37 MV_JOINT_HNZVNZ = 3, /* Both components nonzero */
38 } MV_JOINT_TYPE;
39
mv_joint_vertical(MV_JOINT_TYPE type)40 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
41 return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
42 }
43
mv_joint_horizontal(MV_JOINT_TYPE type)44 static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
45 return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
46 }
47
48 /* Symbols for coding magnitude class of nonzero components */
49 #define MV_CLASSES 11
50 typedef enum {
51 MV_CLASS_0 = 0, /* (0, 2] integer pel */
52 MV_CLASS_1 = 1, /* (2, 4] integer pel */
53 MV_CLASS_2 = 2, /* (4, 8] integer pel */
54 MV_CLASS_3 = 3, /* (8, 16] integer pel */
55 MV_CLASS_4 = 4, /* (16, 32] integer pel */
56 MV_CLASS_5 = 5, /* (32, 64] integer pel */
57 MV_CLASS_6 = 6, /* (64, 128] integer pel */
58 MV_CLASS_7 = 7, /* (128, 256] integer pel */
59 MV_CLASS_8 = 8, /* (256, 512] integer pel */
60 MV_CLASS_9 = 9, /* (512, 1024] integer pel */
61 MV_CLASS_10 = 10, /* (1024,2048] integer pel */
62 } MV_CLASS_TYPE;
63
64 #define CLASS0_BITS 1 /* bits at integer precision for class 0 */
65 #define CLASS0_SIZE (1 << CLASS0_BITS)
66 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
67 #define MV_FP_SIZE 4
68
69 #define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
70 #define MV_MAX ((1 << MV_MAX_BITS) - 1)
71 #define MV_VALS ((MV_MAX << 1) + 1)
72
73 #define MV_IN_USE_BITS 14
74 #define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
75 #define MV_LOW (-(1 << MV_IN_USE_BITS))
76
77 extern const vp9_tree_index vp9_mv_joint_tree[];
78 extern const vp9_tree_index vp9_mv_class_tree[];
79 extern const vp9_tree_index vp9_mv_class0_tree[];
80 extern const vp9_tree_index vp9_mv_fp_tree[];
81
82 typedef struct {
83 vp9_prob sign;
84 vp9_prob classes[MV_CLASSES - 1];
85 vp9_prob class0[CLASS0_SIZE - 1];
86 vp9_prob bits[MV_OFFSET_BITS];
87 vp9_prob class0_fp[CLASS0_SIZE][MV_FP_SIZE - 1];
88 vp9_prob fp[MV_FP_SIZE - 1];
89 vp9_prob class0_hp;
90 vp9_prob hp;
91 } nmv_component;
92
93 typedef struct {
94 vp9_prob joints[MV_JOINTS - 1];
95 nmv_component comps[2];
96 } nmv_context;
97
vp9_get_mv_joint(const MV * mv)98 static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
99 if (mv->row == 0) {
100 return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
101 } else {
102 return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
103 }
104 }
105
106 MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
107 int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset);
108
109
110 typedef struct {
111 unsigned int sign[2];
112 unsigned int classes[MV_CLASSES];
113 unsigned int class0[CLASS0_SIZE];
114 unsigned int bits[MV_OFFSET_BITS][2];
115 unsigned int class0_fp[CLASS0_SIZE][MV_FP_SIZE];
116 unsigned int fp[MV_FP_SIZE];
117 unsigned int class0_hp[2];
118 unsigned int hp[2];
119 } nmv_component_counts;
120
121 typedef struct {
122 unsigned int joints[MV_JOINTS];
123 nmv_component_counts comps[2];
124 } nmv_context_counts;
125
126 void vp9_inc_mv(const MV *mv, nmv_context_counts *mvctx);
127
128 #ifdef __cplusplus
129 } // extern "C"
130 #endif
131
132 #endif // VP9_COMMON_VP9_ENTROPYMV_H_
133