/*
 * 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.
 */

#include <assert.h>

#include "aom_dsp/flow_estimation/corner_match.h"
#include "aom_dsp/flow_estimation/disflow.h"
#include "aom_dsp/flow_estimation/flow_estimation.h"
#include "aom_ports/mem.h"
#include "aom_scale/yv12config.h"

int aom_compute_global_motion(TransformationType type,
                              unsigned char *src_buffer, int src_width,
                              int src_height, int src_stride, int *src_corners,
                              int num_src_corners, YV12_BUFFER_CONFIG *ref,
                              int bit_depth,
                              GlobalMotionEstimationType gm_estimation_type,
                              int *num_inliers_by_motion,
                              MotionModel *params_by_motion, int num_motions) {
  switch (gm_estimation_type) {
    case GLOBAL_MOTION_FEATURE_BASED:
      return av1_compute_global_motion_feature_based(
          type, src_buffer, src_width, src_height, src_stride, src_corners,
          num_src_corners, ref, bit_depth, num_inliers_by_motion,
          params_by_motion, num_motions);
    case GLOBAL_MOTION_DISFLOW_BASED:
      return av1_compute_global_motion_disflow_based(
          type, src_buffer, src_width, src_height, src_stride, src_corners,
          num_src_corners, ref, bit_depth, num_inliers_by_motion,
          params_by_motion, num_motions);
    default: assert(0 && "Unknown global motion estimation type");
  }
  return 0;
}

unsigned char *av1_downconvert_frame(YV12_BUFFER_CONFIG *frm, int bit_depth) {
  int i, j;
  uint16_t *orig_buf = CONVERT_TO_SHORTPTR(frm->y_buffer);
  uint8_t *buf_8bit = frm->y_buffer_8bit;
  assert(buf_8bit);
  if (!frm->buf_8bit_valid) {
    for (i = 0; i < frm->y_height; ++i) {
      for (j = 0; j < frm->y_width; ++j) {
        buf_8bit[i * frm->y_stride + j] =
            orig_buf[i * frm->y_stride + j] >> (bit_depth - 8);
      }
    }
    frm->buf_8bit_valid = 1;
  }
  return buf_8bit;
}