208 строки
6.8 KiB
C
208 строки
6.8 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AV1_COMMON_MV_H_
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#define AV1_COMMON_MV_H_
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#include "av1/common/common.h"
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#include "aom_dsp/aom_filter.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct mv {
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int16_t row;
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int16_t col;
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} MV;
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typedef union int_mv {
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uint32_t as_int;
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MV as_mv;
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} int_mv; /* facilitates faster equality tests and copies */
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typedef struct mv32 {
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int32_t row;
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int32_t col;
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} MV32;
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#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION
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// Bits of precision used for the model
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#define WARPEDMODEL_PREC_BITS 16
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#define WARPEDMODEL_ROW3HOMO_PREC_BITS 16
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// Bits of subpel precision for warped interpolation
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#define WARPEDPIXEL_PREC_BITS 6
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#define WARPEDPIXEL_PREC_SHIFTS (1 << WARPEDPIXEL_PREC_BITS)
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// Taps for ntap filter
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#define WARPEDPIXEL_FILTER_TAPS 6
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// Precision of filter taps
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#define WARPEDPIXEL_FILTER_BITS 7
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#define WARPEDDIFF_PREC_BITS (WARPEDMODEL_PREC_BITS - WARPEDPIXEL_PREC_BITS)
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/* clang-format off */
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typedef enum {
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IDENTITY = 0, // identity transformation, 0-parameter
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TRANSLATION = 1, // translational motion 2-parameter
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ROTZOOM = 2, // simplified affine with rotation + zoom only, 4-parameter
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AFFINE = 3, // affine, 6-parameter
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HOMOGRAPHY = 4, // homography, 8-parameter
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TRANS_TYPES = 5,
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} TransformationType;
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/* clang-format on */
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// Number of types used for global motion (must be >= 3 and <= TRANS_TYPES)
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#define GLOBAL_TRANS_TYPES 3
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// number of parameters used by each transformation in TransformationTypes
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static const int n_trans_model_params[TRANS_TYPES] = { 0, 2, 4, 6, 8 };
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// The order of values in the wmmat matrix below is best described
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// by the homography:
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// [x' (m2 m3 m0 [x
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// y' = m4 m5 m1 * y
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// 1] m6 m7 1) 1]
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typedef struct {
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TransformationType wmtype;
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int32_t wmmat[8];
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} WarpedMotionParams;
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#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION
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#if CONFIG_GLOBAL_MOTION
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// ALPHA here refers to parameters a and b in rotzoom model:
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// | a b|
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// |-b a|
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//
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// and a, b, c, d in affine model:
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// | a b|
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// | c d|
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//
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// Anything ending in PREC_BITS is the number of bits of precision
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// to maintain when converting from double to integer.
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//
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// The ABS parameters are used to create an upper and lower bound
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// for each parameter. In other words, after a parameter is integerized
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// it is clamped between -(1 << ABS_XXX_BITS) and (1 << ABS_XXX_BITS).
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//
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// XXX_PREC_DIFF and XXX_DECODE_FACTOR
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// are computed once here to prevent repetitive
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// computation on the decoder side. These are
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// to allow the global motion parameters to be encoded in a lower
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// precision than the warped model precision. This means that they
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// need to be changed to warped precision when they are decoded.
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//
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// XX_MIN, XX_MAX are also computed to avoid repeated computation
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#define GM_TRANS_PREC_BITS 3
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#define GM_ABS_TRANS_BITS 9
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#define GM_TRANS_PREC_DIFF (WARPEDMODEL_PREC_BITS - GM_TRANS_PREC_BITS)
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#define GM_TRANS_DECODE_FACTOR (1 << GM_TRANS_PREC_DIFF)
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#define GM_ALPHA_PREC_BITS 15
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#define GM_ABS_ALPHA_BITS 12
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#define GM_ALPHA_PREC_DIFF (WARPEDMODEL_PREC_BITS - GM_ALPHA_PREC_BITS)
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#define GM_ALPHA_DECODE_FACTOR (1 << GM_ALPHA_PREC_DIFF)
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#define GM_ROW3HOMO_PREC_BITS 16
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#define GM_ABS_ROW3HOMO_BITS 11
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#define GM_ROW3HOMO_PREC_DIFF \
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(WARPEDMODEL_ROW3HOMO_PREC_BITS - GM_ROW3HOMO_PREC_BITS)
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#define GM_ROW3HOMO_DECODE_FACTOR (1 << GM_ROW3HOMO_PREC_DIFF)
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#define GM_TRANS_MAX (1 << GM_ABS_TRANS_BITS)
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#define GM_ALPHA_MAX (1 << GM_ABS_ALPHA_BITS)
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#define GM_ROW3HOMO_MAX (1 << GM_ABS_ROW3HOMO_BITS)
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#define GM_TRANS_MIN -GM_TRANS_MAX
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#define GM_ALPHA_MIN -GM_ALPHA_MAX
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#define GM_ROW3HOMO_MIN -GM_ROW3HOMO_MAX
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// Bits used for different models
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#define GM_IDENTITY_BITS 0
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#define GM_TRANSLATION_BITS ((GM_ABS_TRANS_BITS + 1) * 2)
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#define GM_ROTZOOM_BITS (GM_TRANSLATION_BITS + (GM_ABS_ALPHA_BITS + 1) * 2)
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#define GM_AFFINE_BITS (GM_ROTZOOM_BITS + (GM_ABS_ALPHA_BITS + 1) * 2)
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#define GM_HOMOGRAPHY_BITS (GM_AFFINE_BITS + (GM_ABS_ROW3HOMO_BITS + 1) * 2)
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// Convert a global motion translation vector (which may have more bits than a
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// regular motion vector) into a motion vector
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static INLINE int_mv gm_get_motion_vector(const WarpedMotionParams *gm,
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int allow_hp) {
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int_mv res;
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res.as_mv.row = allow_hp ? (int16_t)ROUND_POWER_OF_TWO_SIGNED(
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gm->wmmat[1], WARPEDMODEL_PREC_BITS - 3)
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: (int16_t)ROUND_POWER_OF_TWO_SIGNED(
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gm->wmmat[1], WARPEDMODEL_PREC_BITS - 2) *
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2;
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res.as_mv.col = allow_hp ? (int16_t)ROUND_POWER_OF_TWO_SIGNED(
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gm->wmmat[0], WARPEDMODEL_PREC_BITS - 3)
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: (int16_t)ROUND_POWER_OF_TWO_SIGNED(
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gm->wmmat[0], WARPEDMODEL_PREC_BITS - 2) *
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2;
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return res;
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}
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static INLINE TransformationType get_gmtype(const WarpedMotionParams *gm) {
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// if (gm->wmmat[6] != 0 || gm->wmmat[7] != 0) return HOMOGRAPHY;
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if (gm->wmmat[5] == (1 << WARPEDMODEL_PREC_BITS) && !gm->wmmat[4] &&
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gm->wmmat[2] == (1 << WARPEDMODEL_PREC_BITS) && !gm->wmmat[3]) {
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return ((!gm->wmmat[1] && !gm->wmmat[0]) ? IDENTITY : TRANSLATION);
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}
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if (gm->wmmat[2] == gm->wmmat[5] && gm->wmmat[3] == -gm->wmmat[4])
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return ROTZOOM;
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else
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return AFFINE;
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}
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static INLINE void set_default_gmparams(WarpedMotionParams *wm) {
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static const int32_t default_wm_mat[8] = {
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0, 0, (1 << WARPEDMODEL_PREC_BITS), 0, 0, (1 << WARPEDMODEL_PREC_BITS), 0, 0
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};
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memcpy(wm->wmmat, default_wm_mat, sizeof(wm->wmmat));
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wm->wmtype = IDENTITY;
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}
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#endif // CONFIG_GLOBAL_MOTION
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#if CONFIG_REF_MV
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typedef struct candidate_mv {
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int_mv this_mv;
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int_mv comp_mv;
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uint8_t pred_diff[2];
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int weight;
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} CANDIDATE_MV;
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#endif
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static INLINE int is_zero_mv(const MV *mv) {
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return *((const uint32_t *)mv) == 0;
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}
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static INLINE int is_equal_mv(const MV *a, const MV *b) {
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return *((const uint32_t *)a) == *((const uint32_t *)b);
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}
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static INLINE void clamp_mv(MV *mv, int min_col, int max_col, int min_row,
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int max_row) {
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mv->col = clamp(mv->col, min_col, max_col);
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mv->row = clamp(mv->row, min_row, max_row);
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}
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static INLINE int mv_has_subpel(const MV *mv) {
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return (mv->row & SUBPEL_MASK) || (mv->col & SUBPEL_MASK);
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AV1_COMMON_MV_H_
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