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
19extern "C" {
20#endif
21
22struct VP9Common;
23
24void vp9_init_mv_probs(struct VP9Common *cm);
25
26void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
27int 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
33typedef 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
40static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
41  return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
42}
43
44static 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
50typedef 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
77extern const vp9_tree_index vp9_mv_joint_tree[];
78extern const vp9_tree_index vp9_mv_class_tree[];
79extern const vp9_tree_index vp9_mv_class0_tree[];
80extern const vp9_tree_index vp9_mv_fp_tree[];
81
82typedef 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
93typedef struct {
94  vp9_prob joints[MV_JOINTS - 1];
95  nmv_component comps[2];
96} nmv_context;
97
98static 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
106MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
107int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset);
108
109
110typedef 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
121typedef struct {
122  unsigned int joints[MV_JOINTS];
123  nmv_component_counts comps[2];
124} nmv_context_counts;
125
126void 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