text: /*
   *  Copyright (c) 2017 The WebRTC 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 <algorithm>
  #include <array>
  
  #include "webrtc/common_audio/wav_file.h"
  #include "webrtc/common_audio/wav_header.h"
  #include "webrtc/test/fake_audio_device.h"
  #include "webrtc/test/gtest.h"
  #include "webrtc/test/testsupport/fileutils.h"
  
  namespace webrtc {
  namespace test {
  
  namespace {
  void RunTest(const std::vector<int16_t>& input_samples,
               const std::vector<int16_t>& expected_samples,
               size_t samples_per_frame) {
    const ::testing::TestInfo* const test_info =
        ::testing::UnitTest::GetInstance()->current_test_info();
  
    const std::string output_filename = test::OutputPath() +
        "BoundedWavFileWriterTest_" + test_info->name() + ".wav";
  
    static const size_t kSamplesPerFrame = 8;
    static const int kSampleRate = kSamplesPerFrame * 100;
    EXPECT_EQ(FakeAudioDevice::SamplesPerFrame(kSampleRate), kSamplesPerFrame);
  
    {
      std::unique_ptr<FakeAudioDevice::Renderer> writer =
          FakeAudioDevice::CreateBoundedWavFileWriter(output_filename, 800);
  
      for (size_t i = 0; i < input_samples.size(); i += kSamplesPerFrame) {
        EXPECT_TRUE(writer->Render(rtc::ArrayView<const int16_t>(
            &input_samples[i],
            std::min(kSamplesPerFrame, input_samples.size() - i))));
      }
    }
  
    {
      WavReader reader(output_filename);
      std::vector<int16_t> read_samples(expected_samples.size());
      EXPECT_EQ(expected_samples.size(),
                reader.ReadSamples(read_samples.size(), read_samples.data()));
      EXPECT_EQ(expected_samples, read_samples);
  
      EXPECT_EQ(0u, reader.ReadSamples(read_samples.size(), read_samples.data()));
    }
  
    remove(output_filename.c_str());
  }
  }  // namespace
  
  TEST(BoundedWavFileWriterTest, NoSilence) {
    static const std::vector<int16_t> kInputSamples = {
        75, 1234, 243, -1231, -22222, 0, 3, 88,
        1222, -1213, -13222, -7, -3525, 5787, -25247, 8
    };
    static const std::vector<int16_t> kExpectedSamples = kInputSamples;
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, SomeStartSilence) {
    static const std::vector<int16_t> kInputSamples = {
        0, 0, 0, 0, 3, 0, 0, 0,
        0, 3, -13222, -7, -3525, 5787, -25247, 8
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 10,
                                                       kInputSamples.end());
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, NegativeStartSilence) {
    static const std::vector<int16_t> kInputSamples = {
        0, -4, -6, 0, 3, 0, 0, 0,
        0, 3, -13222, -7, -3525, 5787, -25247, 8
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 2,
                                                       kInputSamples.end());
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, SomeEndSilence) {
    static const std::vector<int16_t> kInputSamples = {
        75, 1234, 243, -1231, -22222, 0, 1, 0,
        0, 0, 0, 0, 0, 0, 0, 0
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
                                                       kInputSamples.end() - 9);
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, DoubleEndSilence) {
    static const std::vector<int16_t> kInputSamples = {
        75, 1234, 243, -1231, -22222, 0, 0, 0,
        0, -1213, -13222, -7, -3525, 5787, 0, 0
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
                                                       kInputSamples.end() - 2);
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, DoubleSilence) {
    static const std::vector<int16_t> kInputSamples = {
        0, -1213, -13222, -7, -3525, 5787, 0, 0
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 1,
                                                       kInputSamples.end() - 2);
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  TEST(BoundedWavFileWriterTest, EndSilenceCutoff) {
    static const std::vector<int16_t> kInputSamples = {
        75, 1234, 243, -1231, -22222, 0, 1, 0,
        0, 0, 0
    };
    static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
                                                       kInputSamples.end() - 4);
    RunTest(kInputSamples, kExpectedSamples, 8);
  }
  
  }  // namespace test
  }  // namespace webrtc
  