view carfac/sai_test.cc @ 648:1c2a5868f23a

Fix memory leak in CARFAC.

Also get rid of most uses of auto, which tend to hurt readability
unless the type name is particularly long, especially when it masks
pointers.

// Copyright 2013, Google, Inc.
// Author: Ron Weiss <[e-mail]>
//
// This C++ file is part of an implementation of Lyon's cochlear model:
// "Cascade of Asymmetric Resonators with Fast-Acting Compression"
// to supplement Lyon's upcoming book "Human and Machine Hearing"
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "sai.h"

#include <iostream>
#include <vector>

#include "gtest/gtest.h"

using testing::Values;
using std::vector;

vector<ArrayX> CreateZeroSegment(int n_ch, int length) {
  vector<ArrayX> segment;
  for (int i = 0; i < length; ++i) {
    segment.push_back(ArrayX::Zero(n_ch));
  }
  return segment;
}

bool HasPeakAt(const ArrayXX& frame, int index) {
  if (index == 0) {
    return frame(index) > frame(index + 1);
  } else if (index == frame.size() - 1) {
    return frame(index) > frame(index - 1);
  }
  return frame(index) > frame(index + 1) && frame(index) > frame(index - 1);
}

class SAIPeriodicInputTest
    : public testing::TestWithParam<std::tr1::tuple<int, int>> {
 protected:
  void SetUp() {
    period_ = std::tr1::get<0>(GetParam());
    phase_ = std::tr1::get<1>(GetParam());
  }

  int period_;
  int phase_;
};

TEST_P(SAIPeriodicInputTest, SingleChannelPulseTrain) {
  vector<ArrayX> segment = CreateZeroSegment(1, 38);
  for (int i = phase_; i < segment.size(); i += period_) {
    segment[i](0) = 1;
  }

  SAIParams sai_params;
  sai_params.window_width = segment.size();
  sai_params.n_ch = 1;
  sai_params.width = 15;
  // Half of the SAI should come from the future.
  // sai_params.future_lags = sai_params.width / 2;
  sai_params.future_lags = 0;
  sai_params.n_window_pos = 2;

  SAI sai(sai_params);
  ArrayXX sai_frame;
  sai.RunSegment(segment, &sai_frame);

  // The output should have peaks at the same positions, regardless of
  // input phase.
  for (int i = sai_frame.size() - 1; i >= 0 ; i -= period_) {
    EXPECT_TRUE(HasPeakAt(sai_frame, i));
  }

  for (int i = 0; i < segment.size(); ++i) {
    std::cout << segment[i](0) << " ";
  }
  std::cout << "\n";
  for (int i = 0; i < sai_frame.size(); ++i) {
    std::cout << sai_frame(i) << " ";
  }
  std::cout << "\n";
}
INSTANTIATE_TEST_CASE_P(PeriodicInputVariations, SAIPeriodicInputTest,
                        testing::Combine(Values(25, 10, 5, 2),  // periods.
                                         Values(0, 3)));  // phases.