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decimator_unittest.cc (4580B)

      1 /*
      2 *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
      3 *
      4 *  Use of this source code is governed by a BSD-style license
      5 *  that can be found in the LICENSE file in the root of the source
      6 *  tree. An additional intellectual property rights grant can be found
      7 *  in the file PATENTS.  All contributing project authors may
      8 *  be found in the AUTHORS file in the root of the source tree.
      9 */
     10 
     11 #include "modules/audio_processing/aec3/decimator.h"
     12 
     13 #include <algorithm>
     14 #include <array>
     15 #include <cmath>
     16 #include <cstring>
     17 #include <numbers>
     18 #include <numeric>
     19 #include <string>
     20 #include <vector>
     21 
     22 #include "api/array_view.h"
     23 #include "modules/audio_processing/aec3/aec3_common.h"
     24 #include "rtc_base/checks.h"
     25 #include "rtc_base/strings/string_builder.h"
     26 #include "test/gtest.h"
     27 
     28 namespace webrtc {
     29 
     30 namespace {
     31 
     32 std::string ProduceDebugText(int sample_rate_hz) {
     33  StringBuilder ss;
     34  ss << "Sample rate: " << sample_rate_hz;
     35  return ss.Release();
     36 }
     37 
     38 constexpr size_t kDownSamplingFactors[] = {4, 8};
     39 constexpr float kPi = std::numbers::pi_v<float>;
     40 constexpr size_t kNumStartupBlocks = 50;
     41 constexpr size_t kNumBlocks = 1000;
     42 
     43 void ProduceDecimatedSinusoidalOutputPower(int sample_rate_hz,
     44                                           size_t down_sampling_factor,
     45                                           float sinusoidal_frequency_hz,
     46                                           float* input_power,
     47                                           float* output_power) {
     48  float input[kBlockSize * kNumBlocks];
     49  const size_t sub_block_size = kBlockSize / down_sampling_factor;
     50 
     51  // Produce a sinusoid of the specified frequency.
     52  for (size_t k = 0; k < kBlockSize * kNumBlocks; ++k) {
     53    input[k] = 32767.f * std::sin(2.f * kPi * sinusoidal_frequency_hz * k /
     54                                  sample_rate_hz);
     55  }
     56 
     57  Decimator decimator(down_sampling_factor);
     58  std::vector<float> output(sub_block_size * kNumBlocks);
     59 
     60  for (size_t k = 0; k < kNumBlocks; ++k) {
     61    std::vector<float> sub_block(sub_block_size);
     62    decimator.Decimate(
     63        ArrayView<const float>(&input[k * kBlockSize], kBlockSize), sub_block);
     64 
     65    std::copy(sub_block.begin(), sub_block.end(),
     66              output.begin() + k * sub_block_size);
     67  }
     68 
     69  ASSERT_GT(kNumBlocks, kNumStartupBlocks);
     70  ArrayView<const float> input_to_evaluate(
     71      &input[kNumStartupBlocks * kBlockSize],
     72      (kNumBlocks - kNumStartupBlocks) * kBlockSize);
     73  ArrayView<const float> output_to_evaluate(
     74      &output[kNumStartupBlocks * sub_block_size],
     75      (kNumBlocks - kNumStartupBlocks) * sub_block_size);
     76  *input_power =
     77      std::inner_product(input_to_evaluate.begin(), input_to_evaluate.end(),
     78                         input_to_evaluate.begin(), 0.f) /
     79      input_to_evaluate.size();
     80  *output_power =
     81      std::inner_product(output_to_evaluate.begin(), output_to_evaluate.end(),
     82                         output_to_evaluate.begin(), 0.f) /
     83      output_to_evaluate.size();
     84 }
     85 
     86 }  // namespace
     87 
     88 // Verifies that there is little aliasing from upper frequencies in the
     89 // downsampling.
     90 TEST(Decimator, NoLeakageFromUpperFrequencies) {
     91  float input_power;
     92  float output_power;
     93  for (auto rate : {16000, 32000, 48000}) {
     94    for (auto down_sampling_factor : kDownSamplingFactors) {
     95      ProduceDebugText(rate);
     96      ProduceDecimatedSinusoidalOutputPower(rate, down_sampling_factor,
     97                                            3.f / 8.f * rate, &input_power,
     98                                            &output_power);
     99      EXPECT_GT(0.0001f * input_power, output_power);
    100    }
    101  }
    102 }
    103 
    104 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
    105 // Verifies the check for the input size.
    106 TEST(DecimatorDeathTest, WrongInputSize) {
    107  Decimator decimator(4);
    108  std::vector<float> x(kBlockSize - 1, 0.f);
    109  std::array<float, kBlockSize / 4> x_downsampled;
    110  EXPECT_DEATH(decimator.Decimate(x, x_downsampled), "");
    111 }
    112 
    113 // Verifies the check for non-null output parameter.
    114 TEST(DecimatorDeathTest, NullOutput) {
    115  Decimator decimator(4);
    116  std::vector<float> x(kBlockSize, 0.f);
    117  EXPECT_DEATH(decimator.Decimate(x, nullptr), "");
    118 }
    119 
    120 // Verifies the check for the output size.
    121 TEST(DecimatorDeathTest, WrongOutputSize) {
    122  Decimator decimator(4);
    123  std::vector<float> x(kBlockSize, 0.f);
    124  std::array<float, kBlockSize / 4 - 1> x_downsampled;
    125  EXPECT_DEATH(decimator.Decimate(x, x_downsampled), "");
    126 }
    127 
    128 // Verifies the check for the correct downsampling factor.
    129 TEST(DecimatorDeathTest, CorrectDownSamplingFactor) {
    130  EXPECT_DEATH(Decimator(3), "");
    131 }
    132 
    133 #endif
    134 
    135 }  // namespace webrtc