/*
 *  Copyright (c) 2015 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "test/av1_txfm_test.h"
#include "av1/common/av1_fwd_txfm1d.h"
#include "av1/common/av1_inv_txfm1d.h"

using libaom_test::ACMRandom;
using libaom_test::input_base;

namespace {
const int txfm_type_num = 2;
const int txfm_size_num = 5;
const int txfm_size_ls[5] = { 4, 8, 16, 32 };

const TxfmFunc fwd_txfm_func_ls[2][5] = {
  { av1_fdct4_new, av1_fdct8_new, av1_fdct16_new, av1_fdct32_new, NULL },
  { av1_fadst4_new, av1_fadst8_new, av1_fadst16_new, av1_fadst32_new, NULL }
};

const TxfmFunc inv_txfm_func_ls[2][5] = {
  { av1_idct4_new, av1_idct8_new, av1_idct16_new, av1_idct32_new, NULL },
  { av1_iadst4_new, av1_iadst8_new, av1_iadst16_new, av1_iadst32_new, NULL }
};

// the maximum stage number of fwd/inv 1d dct/adst txfm is 12
const int8_t cos_bit[12] = { 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14 };
const int8_t range_bit[12] = { 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32 };

TEST(av1_inv_txfm1d, round_trip) {
  ACMRandom rnd(ACMRandom::DeterministicSeed());
  for (int si = 0; si < txfm_size_num; ++si) {
    int txfm_size = txfm_size_ls[si];
    int32_t *input = new int32_t[txfm_size];
    int32_t *output = new int32_t[txfm_size];
    int32_t *round_trip_output = new int32_t[txfm_size];

    for (int ti = 0; ti < txfm_type_num; ++ti) {
      TxfmFunc fwd_txfm_func = fwd_txfm_func_ls[ti][si];
      TxfmFunc inv_txfm_func = inv_txfm_func_ls[ti][si];
      int max_error = 2;

      if (fwd_txfm_func != NULL) {
        const int count_test_block = 5000;
        for (int ci = 0; ci < count_test_block; ++ci) {
          for (int ni = 0; ni < txfm_size; ++ni) {
            input[ni] = rnd.Rand16() % input_base - rnd.Rand16() % input_base;
          }

          fwd_txfm_func(input, output, cos_bit, range_bit);
          inv_txfm_func(output, round_trip_output, cos_bit, range_bit);

          for (int ni = 0; ni < txfm_size; ++ni) {
            int node_err =
                abs(input[ni] - round_shift(round_trip_output[ni],
                                            get_max_bit(txfm_size) - 1));
            EXPECT_LE(node_err, max_error);
          }
        }
      }
    }
    delete[] input;
    delete[] output;
    delete[] round_trip_output;
  }
}

}  // namespace