text: /*
   * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   *
   * This source code is subject to the terms of the BSD 2 Clause License and
   * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   * was not distributed with this source code in the LICENSE file, you can
   * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   * Media Patent License 1.0 was not distributed with this source code in the
   * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
   */
  
  #ifndef AOM_AV1_COMMON_ENTROPYMV_H_
  #define AOM_AV1_COMMON_ENTROPYMV_H_
  
  #include "config/aom_config.h"
  
  #include "aom_dsp/prob.h"
  
  #include "av1/common/mv.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  struct AV1Common;
  
  void av1_init_mv_probs(struct AV1Common *cm);
  
  #define MV_UPDATE_PROB 252
  
  /* Symbols for coding which components are zero jointly */
  #define MV_JOINTS 4
  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 */
  } UENUM1BYTE(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;
  }
  
  /* Symbols for coding magnitude class of nonzero components */
  #define MV_CLASSES 11
  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 */
  } UENUM1BYTE(MV_CLASS_TYPE);
  
  #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_BITS_CONTEXTS 6
  #define MV_FP_SIZE 4
  
  #define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
  #define MV_MAX ((1 << MV_MAX_BITS) - 1)
  #define MV_VALS ((MV_MAX << 1) + 1)
  
  #define MV_IN_USE_BITS 14
  #define MV_UPP (1 << MV_IN_USE_BITS)
  #define MV_LOW (-(1 << MV_IN_USE_BITS))
  
  typedef struct {
    aom_cdf_prob classes_cdf[CDF_SIZE(MV_CLASSES)];
    aom_cdf_prob class0_fp_cdf[CLASS0_SIZE][CDF_SIZE(MV_FP_SIZE)];
    aom_cdf_prob fp_cdf[CDF_SIZE(MV_FP_SIZE)];
    aom_cdf_prob sign_cdf[CDF_SIZE(2)];
    aom_cdf_prob class0_hp_cdf[CDF_SIZE(2)];
    aom_cdf_prob hp_cdf[CDF_SIZE(2)];
    aom_cdf_prob class0_cdf[CDF_SIZE(CLASS0_SIZE)];
    aom_cdf_prob bits_cdf[MV_OFFSET_BITS][CDF_SIZE(2)];
  } nmv_component;
  
  typedef struct {
    aom_cdf_prob joints_cdf[CDF_SIZE(MV_JOINTS)];
    nmv_component comps[2];
  } nmv_context;
  
  enum {
    MV_SUBPEL_NONE = -1,
    MV_SUBPEL_LOW_PRECISION = 0,
    MV_SUBPEL_HIGH_PRECISION,
  } SENUM1BYTE(MvSubpelPrecision);
  
  #ifdef __cplusplus
  }  // extern "C"
  #endif
  
  #endif  // AOM_AV1_COMMON_ENTROPYMV_H_
  