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 VP9_COMMON_VP9_ENTROPYMV_H_ 12 #define 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 usehp); 29 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 46 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) { 47 return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ; 48 } 49 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; 103 104 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 *mvctx); 131 132 #ifdef __cplusplus 133 } // extern "C" 134 #endif 135 136 #endif // VP9_COMMON_VP9_ENTROPYMV_H_ 137