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/*
* 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_ENCODER_OPTICAL_FLOW_H_
#define AOM_AV1_ENCODER_OPTICAL_FLOW_H_
#include "aom_scale/yv12config.h"
#include "av1/common/mv.h"
#include "config/aom_config.h"
#ifdef __cplusplus
extern "C" {
#endif
#if CONFIG_OPTICAL_FLOW_API
typedef enum { LUCAS_KANADE, HORN_SCHUNCK } OPTFLOW_METHOD;
typedef enum {
MV_FILTER_NONE,
MV_FILTER_SMOOTH,
MV_FILTER_MEDIAN
} MV_FILTER_TYPE;
typedef struct LOCALMV {
double row;
double col;
} LOCALMV;
#define MAX_PYRAMID_LEVELS 5
// default options for optical flow
#define OPFL_WINDOW_SIZE 15
#define OPFL_PYRAMID_LEVELS 3 // total levels
#define OPFL_WARPING_STEPS 3
// parameters specific to Lucas-Kanade
typedef struct lk_params {
int window_size;
} LK_PARAMS;
// generic structure to contain parameters for all
// optical flow algorithms
typedef struct opfl_params {
int pyramid_levels;
int warping_steps;
LK_PARAMS *lk_params;
int flags;
} OPFL_PARAMS;
#define OPFL_FLAG_SPARSE 1
void av1_init_opfl_params(OPFL_PARAMS *opfl_params);
void av1_init_lk_params(LK_PARAMS *lk_params);
void av1_optical_flow(const YV12_BUFFER_CONFIG *from_frame,
const YV12_BUFFER_CONFIG *to_frame,
const int from_frame_idx, const int to_frame_idx,
const int bit_depth, const OPFL_PARAMS *opfl_params,
const MV_FILTER_TYPE mv_filter,
const OPTFLOW_METHOD method, MV *mvs);
#endif
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AV1_ENCODER_OPTICAL_FLOW_H_
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