Line data    Source code

       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           0 : static INLINE int use_mv_hp(const MV *ref) {
      31           0 :   const int kMvRefThresh = 64;  // threshold for use of high-precision 1/8 mv
      32           0 :   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           0 : static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
      47           0 :   return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
      48             : }
      49             : 
      50           0 : static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
      51           0 :   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           0 : static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
     105           0 :   if (mv->row == 0) {
     106           0 :     return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
     107             :   } else {
     108           0 :     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_