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 #ifndef VPX_VP9_COMMON_VP9_ENTROPYMV_H_
12 #define VPX_VP9_COMMON_VP9_ENTROPYMV_H_
13
14 #include "./vpx_config.h"
15
16 #include "vpx_dsp/prob.h"
17
18 #include "vp9/common/vp9_mv.h"
19
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23
24 struct VP9Common;
25
26 void vp9_init_mv_probs(struct VP9Common *cm);
27
28 void vp9_adapt_mv_probs(struct VP9Common *cm, int allow_hp);
29
use_mv_hp(const MV * ref)30 static INLINE int use_mv_hp(const MV *ref) {
31 const int kMvRefThresh = 64; // threshold for use of high-precision 1/8 mv
32 return abs(ref->row) < kMvRefThresh && abs(ref->col) < kMvRefThresh;
33 }
34
35 #define MV_UPDATE_PROB 252
36
37 /* Symbols for coding which components are zero jointly */
38 #define MV_JOINTS 4
39 typedef enum {
40 MV_JOINT_ZERO = 0, /* Zero vector */
41 MV_JOINT_HNZVZ = 1, /* Vert zero, hor nonzero */
42 MV_JOINT_HZVNZ = 2, /* Hor zero, vert nonzero */
43 MV_JOINT_HNZVNZ = 3, /* Both components nonzero */
44 } MV_JOINT_TYPE;
45
mv_joint_vertical(MV_JOINT_TYPE type)46 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
47 return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
48 }
49
mv_joint_horizontal(MV_JOINT_TYPE type)50 static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
51 return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
52 }
53
54 /* Symbols for coding magnitude class of nonzero components */
55 #define MV_CLASSES 11
56 typedef enum {
57 MV_CLASS_0 = 0, /* (0, 2] integer pel */
58 MV_CLASS_1 = 1, /* (2, 4] integer pel */
59 MV_CLASS_2 = 2, /* (4, 8] integer pel */
60 MV_CLASS_3 = 3, /* (8, 16] integer pel */
61 MV_CLASS_4 = 4, /* (16, 32] integer pel */
62 MV_CLASS_5 = 5, /* (32, 64] integer pel */
63 MV_CLASS_6 = 6, /* (64, 128] integer pel */
64 MV_CLASS_7 = 7, /* (128, 256] integer pel */
65 MV_CLASS_8 = 8, /* (256, 512] integer pel */
66 MV_CLASS_9 = 9, /* (512, 1024] integer pel */
67 MV_CLASS_10 = 10, /* (1024,2048] integer pel */
68 } MV_CLASS_TYPE;
69
70 #define CLASS0_BITS 1 /* bits at integer precision for class 0 */
71 #define CLASS0_SIZE (1 << CLASS0_BITS)
72 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
73 #define MV_FP_SIZE 4
74
75 #define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
76 #define MV_MAX ((1 << MV_MAX_BITS) - 1)
77 #define MV_VALS ((MV_MAX << 1) + 1)
78
79 #define MV_IN_USE_BITS 14
80 #define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
81 #define MV_LOW (-(1 << MV_IN_USE_BITS))
82
83 extern const vpx_tree_index vp9_mv_joint_tree[];
84 extern const vpx_tree_index vp9_mv_class_tree[];
85 extern const vpx_tree_index vp9_mv_class0_tree[];
86 extern const vpx_tree_index vp9_mv_fp_tree[];
87
88 typedef struct {
89 vpx_prob sign;
90 vpx_prob classes[MV_CLASSES - 1];
91 vpx_prob class0[CLASS0_SIZE - 1];
92 vpx_prob bits[MV_OFFSET_BITS];
93 vpx_prob class0_fp[CLASS0_SIZE][MV_FP_SIZE - 1];
94 vpx_prob fp[MV_FP_SIZE - 1];
95 vpx_prob class0_hp;
96 vpx_prob hp;
97 } nmv_component;
98
99 typedef struct {
100 vpx_prob joints[MV_JOINTS - 1];
101 nmv_component comps[2];
102 } nmv_context;
103
vp9_get_mv_joint(const MV * mv)104 static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
105 if (mv->row == 0) {
106 return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
107 } else {
108 return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
109 }
110 }
111
112 MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
113
114 typedef struct {
115 unsigned int sign[2];
116 unsigned int classes[MV_CLASSES];
117 unsigned int class0[CLASS0_SIZE];
118 unsigned int bits[MV_OFFSET_BITS][2];
119 unsigned int class0_fp[CLASS0_SIZE][MV_FP_SIZE];
120 unsigned int fp[MV_FP_SIZE];
121 unsigned int class0_hp[2];
122 unsigned int hp[2];
123 } nmv_component_counts;
124
125 typedef struct {
126 unsigned int joints[MV_JOINTS];
127 nmv_component_counts comps[2];
128 } nmv_context_counts;
129
130 void vp9_inc_mv(const MV *mv, nmv_context_counts *counts);
131
132 #ifdef __cplusplus
133 } // extern "C"
134 #endif
135
136 #endif // VPX_VP9_COMMON_VP9_ENTROPYMV_H_
137