vpx/vp9/common/vp9_entropymv.h

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */


#ifndef VP9_COMMON_VP9_ENTROPYMV_H_
#define VP9_COMMON_VP9_ENTROPYMV_H_

#include "vp9/common/vp9_treecoder.h"
#include "vpx_config.h"
#include "vp9/common/vp9_blockd.h"

struct VP9Common;

void vp9_entropy_mv_init();
void vp9_init_mv_probs(struct VP9Common *cm);

void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
int vp9_use_mv_hp(const MV *ref);

#define VP9_NMV_UPDATE_PROB  252
#define LOW_PRECISION_MV_UPDATE  /* Use 7 bit forward update */

/* Symbols for coding which components are zero jointly */
#define MV_JOINTS     4
typedef enum {
  MV_JOINT_ZERO = 0,             /* Zero vector */
  MV_JOINT_HNZVZ = 1,            /* Vert zero, hor nonzero */
  MV_JOINT_HZVNZ = 2,            /* Hor zero, vert nonzero */
  MV_JOINT_HNZVNZ = 3,           /* Both components nonzero */
} MV_JOINT_TYPE;

static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
  return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
}

static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
  return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
}

extern const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2];
extern struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];

/* Symbols for coding magnitude class of nonzero components */
#define MV_CLASSES     11
typedef enum {
  MV_CLASS_0 = 0,      /* (0, 2]     integer pel */
  MV_CLASS_1 = 1,      /* (2, 4]     integer pel */
  MV_CLASS_2 = 2,      /* (4, 8]     integer pel */
  MV_CLASS_3 = 3,      /* (8, 16]    integer pel */
  MV_CLASS_4 = 4,      /* (16, 32]   integer pel */
  MV_CLASS_5 = 5,      /* (32, 64]   integer pel */
  MV_CLASS_6 = 6,      /* (64, 128]  integer pel */
  MV_CLASS_7 = 7,      /* (128, 256] integer pel */
  MV_CLASS_8 = 8,      /* (256, 512] integer pel */
  MV_CLASS_9 = 9,      /* (512, 1024] integer pel */
  MV_CLASS_10 = 10,    /* (1024,2048] integer pel */
} MV_CLASS_TYPE;

extern const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2];
extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];

#define CLASS0_BITS    1  /* bits at integer precision for class 0 */
#define CLASS0_SIZE    (1 << CLASS0_BITS)
#define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)

#define MV_MAX_BITS    (MV_CLASSES + CLASS0_BITS + 2)
#define MV_MAX         ((1 << MV_MAX_BITS) - 1)
#define MV_VALS        ((MV_MAX << 1) + 1)

extern const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2];
extern struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];

extern const vp9_tree_index vp9_mv_fp_tree[2 * 4 - 2];
extern struct vp9_token vp9_mv_fp_encodings[4];

typedef struct {
  vp9_prob sign;
  vp9_prob classes[MV_CLASSES - 1];
  vp9_prob class0[CLASS0_SIZE - 1];
  vp9_prob bits[MV_OFFSET_BITS];
  vp9_prob class0_fp[CLASS0_SIZE][4 - 1];
  vp9_prob fp[4 - 1];
  vp9_prob class0_hp;
  vp9_prob hp;
} nmv_component;

typedef struct {
  vp9_prob joints[MV_JOINTS - 1];
  nmv_component comps[2];
} nmv_context;

static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
  if (mv->row == 0) {
    return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
  } else {
    return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
  }
}

MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset);


typedef struct {
  unsigned int mvcount[MV_VALS];
  unsigned int sign[2];
  unsigned int classes[MV_CLASSES];
  unsigned int class0[CLASS0_SIZE];
  unsigned int bits[MV_OFFSET_BITS][2];
  unsigned int class0_fp[CLASS0_SIZE][4];
  unsigned int fp[4];
  unsigned int class0_hp[2];
  unsigned int hp[2];
} nmv_component_counts;

typedef struct {
  unsigned int joints[MV_JOINTS];
  nmv_component_counts comps[2];
} nmv_context_counts;

void vp9_inc_mv(const MV *mv, nmv_context_counts *mvctx);

void vp9_counts_process(nmv_context_counts *NMVcount, int usehp);

#endif  // VP9_COMMON_VP9_ENTROPYMV_H_