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 int vp9_use_mv_hp(const MV *ref);
31
32 #define MV_UPDATE_PROB 252
33
34 /* Symbols for coding which components are zero jointly */
35 #define MV_JOINTS 4
36 typedef enum {
37 MV_JOINT_ZERO = 0, /* Zero vector */
38 MV_JOINT_HNZVZ = 1, /* Vert zero, hor nonzero */
39 MV_JOINT_HZVNZ = 2, /* Hor zero, vert nonzero */
40 MV_JOINT_HNZVNZ = 3, /* Both components nonzero */
41 } MV_JOINT_TYPE;
42
mv_joint_vertical(MV_JOINT_TYPE type)43 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
44 return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
45 }
46
mv_joint_horizontal(MV_JOINT_TYPE type)47 static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
48 return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
49 }
50
51 /* Symbols for coding magnitude class of nonzero components */
52 #define MV_CLASSES 11
53 typedef enum {
54 MV_CLASS_0 = 0, /* (0, 2] integer pel */
55 MV_CLASS_1 = 1, /* (2, 4] integer pel */
56 MV_CLASS_2 = 2, /* (4, 8] integer pel */
57 MV_CLASS_3 = 3, /* (8, 16] integer pel */
58 MV_CLASS_4 = 4, /* (16, 32] integer pel */
59 MV_CLASS_5 = 5, /* (32, 64] integer pel */
60 MV_CLASS_6 = 6, /* (64, 128] integer pel */
61 MV_CLASS_7 = 7, /* (128, 256] integer pel */
62 MV_CLASS_8 = 8, /* (256, 512] integer pel */
63 MV_CLASS_9 = 9, /* (512, 1024] integer pel */
64 MV_CLASS_10 = 10, /* (1024,2048] integer pel */
65 } MV_CLASS_TYPE;
66
67 #define CLASS0_BITS 1 /* bits at integer precision for class 0 */
68 #define CLASS0_SIZE (1 << CLASS0_BITS)
69 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
70 #define MV_FP_SIZE 4
71
72 #define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
73 #define MV_MAX ((1 << MV_MAX_BITS) - 1)
74 #define MV_VALS ((MV_MAX << 1) + 1)
75
76 #define MV_IN_USE_BITS 14
77 #define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
78 #define MV_LOW (-(1 << MV_IN_USE_BITS))
79
80 extern const vpx_tree_index vp9_mv_joint_tree[];
81 extern const vpx_tree_index vp9_mv_class_tree[];
82 extern const vpx_tree_index vp9_mv_class0_tree[];
83 extern const vpx_tree_index vp9_mv_fp_tree[];
84
85 typedef struct {
86 vpx_prob sign;
87 vpx_prob classes[MV_CLASSES - 1];
88 vpx_prob class0[CLASS0_SIZE - 1];
89 vpx_prob bits[MV_OFFSET_BITS];
90 vpx_prob class0_fp[CLASS0_SIZE][MV_FP_SIZE - 1];
91 vpx_prob fp[MV_FP_SIZE - 1];
92 vpx_prob class0_hp;
93 vpx_prob hp;
94 } nmv_component;
95
96 typedef struct {
97 vpx_prob joints[MV_JOINTS - 1];
98 nmv_component comps[2];
99 } nmv_context;
100
vp9_get_mv_joint(const MV * mv)101 static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
102 if (mv->row == 0) {
103 return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
104 } else {
105 return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
106 }
107 }
108
109 MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
110
111 typedef struct {
112 unsigned int sign[2];
113 unsigned int classes[MV_CLASSES];
114 unsigned int class0[CLASS0_SIZE];
115 unsigned int bits[MV_OFFSET_BITS][2];
116 unsigned int class0_fp[CLASS0_SIZE][MV_FP_SIZE];
117 unsigned int fp[MV_FP_SIZE];
118 unsigned int class0_hp[2];
119 unsigned int hp[2];
120 } nmv_component_counts;
121
122 typedef struct {
123 unsigned int joints[MV_JOINTS];
124 nmv_component_counts comps[2];
125 } nmv_context_counts;
126
127 void vp9_inc_mv(const MV *mv, nmv_context_counts *mvctx);
128
129 #ifdef __cplusplus
130 } // extern "C"
131 #endif
132
133 #endif // VP9_COMMON_VP9_ENTROPYMV_H_
134