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      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 "vp9/common/vp9_treecoder.h"
     16 #include "vpx_config.h"
     17 #include "vp9/common/vp9_blockd.h"
     18 
     19 struct VP9Common;
     20 
     21 void vp9_entropy_mv_init();
     22 void vp9_init_mv_probs(struct VP9Common *cm);
     23 
     24 void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
     25 int vp9_use_mv_hp(const MV *ref);
     26 
     27 #define NMV_UPDATE_PROB  252
     28 
     29 /* Symbols for coding which components are zero jointly */
     30 #define MV_JOINTS     4
     31 typedef enum {
     32   MV_JOINT_ZERO = 0,             /* Zero vector */
     33   MV_JOINT_HNZVZ = 1,            /* Vert zero, hor nonzero */
     34   MV_JOINT_HZVNZ = 2,            /* Hor zero, vert nonzero */
     35   MV_JOINT_HNZVNZ = 3,           /* Both components nonzero */
     36 } MV_JOINT_TYPE;
     37 
     38 static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
     39   return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
     40 }
     41 
     42 static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
     43   return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
     44 }
     45 
     46 extern const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2];
     47 extern struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
     48 
     49 /* Symbols for coding magnitude class of nonzero components */
     50 #define MV_CLASSES     11
     51 typedef enum {
     52   MV_CLASS_0 = 0,      /* (0, 2]     integer pel */
     53   MV_CLASS_1 = 1,      /* (2, 4]     integer pel */
     54   MV_CLASS_2 = 2,      /* (4, 8]     integer pel */
     55   MV_CLASS_3 = 3,      /* (8, 16]    integer pel */
     56   MV_CLASS_4 = 4,      /* (16, 32]   integer pel */
     57   MV_CLASS_5 = 5,      /* (32, 64]   integer pel */
     58   MV_CLASS_6 = 6,      /* (64, 128]  integer pel */
     59   MV_CLASS_7 = 7,      /* (128, 256] integer pel */
     60   MV_CLASS_8 = 8,      /* (256, 512] integer pel */
     61   MV_CLASS_9 = 9,      /* (512, 1024] integer pel */
     62   MV_CLASS_10 = 10,    /* (1024,2048] integer pel */
     63 } MV_CLASS_TYPE;
     64 
     65 extern const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2];
     66 extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
     67 
     68 #define CLASS0_BITS    1  /* bits at integer precision for class 0 */
     69 #define CLASS0_SIZE    (1 << CLASS0_BITS)
     70 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
     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 extern const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2];
     77 extern struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];
     78 
     79 extern const vp9_tree_index vp9_mv_fp_tree[2 * 4 - 2];
     80 extern struct vp9_token vp9_mv_fp_encodings[4];
     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][4 - 1];
     88   vp9_prob fp[4 - 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 
     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 mvcount[MV_VALS];
    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][4];
    117   unsigned int fp[4];
    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 #endif  // VP9_COMMON_VP9_ENTROPYMV_H_
    130