/*
 * Copyright (c) 2021, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 3-Clause Clear License
 * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
 * License was not distributed with this source code in the LICENSE file, you
 * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/.  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
 * aomedia.org/license/patent-license/.
 */

#ifndef AOM_AV1_ENCODER_OPTICAL_FLOW_H_
#define AOM_AV1_ENCODER_OPTICAL_FLOW_H_

#include "config/aom_config.h"

#ifdef __cplusplus
extern "C" {
#endif

#if CONFIG_OPTICAL_FLOW_API

typedef enum { LUCAS_KANADE } OPTFLOW_METHOD;

typedef enum {
  MV_FILTER_NONE,
  MV_FILTER_SMOOTH,
  MV_FILTER_MEDIAN
} MV_FILTER_TYPE;

// default options for optical flow
#define OPFL_WINDOW_SIZE 15
#define OPFL_PYRAMID_LEVELS 3  // total levels (max is 5)

// 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;
  LK_PARAMS *lk_params;
} OPFL_PARAMS;

void init_opfl_params(OPFL_PARAMS *opfl_params) {
  opfl_params->pyramid_levels = OPFL_PYRAMID_LEVELS;
  opfl_params->lk_params = NULL;
}

void init_lk_params(LK_PARAMS *lk_params) {
  lk_params->window_size = OPFL_WINDOW_SIZE;
}

void 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_