common_audio/wav_file_unittest.cc - src - Git at Google

 /*
  *  Copyright (c) 2014 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.
  */

 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES

 #include "common_audio/wav_file.h"

 #include <cmath>
 #include <limits>

 #include "common_audio/wav_header.h"
 #include "rtc_base/logging.h"
 #include "test/gtest.h"
 #include "test/testsupport/file_utils.h"

 // WavWriterTest.CPP flaky on Mac. See webrtc:9247.
 #if defined(WEBRTC_MAC)
 #define MAYBE_CPP DISABLED_CPP
 #define MAYBE_CPPReset DISABLED_CPPReset
 #else
 #define MAYBE_CPP CPP
 #define MAYBE_CPPReset CPPReset
 #endif

 namespace webrtc {

 namespace {
 const char* SampleFormatToStr(WavFile::SampleFormat format) {
   switch (format) {
     case WavFile::SampleFormat::kInt16:
       return "int16";
     case WavFile::SampleFormat::kFloat:
       return "float";
   }
   RTC_CHECK_NOTREACHED();
 }
 }  // namespace

 static const float kSamples[] = {0.0, 10.0, 4e4, -1e9};

 // Write a tiny WAV file with the C++ interface and verify the result.
 TEST(WavWriterTest, MAYBE_CPP) {
   const std::string outfile =
       test::OutputPathWithRandomDirectory() + "wavtest1.wav";
   static const size_t kNumSamples = 3;
   {
     WavWriter w(outfile, 14099, 1);
     EXPECT_EQ(14099, w.sample_rate());
     EXPECT_EQ(1u, w.num_channels());
     EXPECT_EQ(0u, w.num_samples());
     w.WriteSamples(kSamples, kNumSamples);
     EXPECT_EQ(kNumSamples, w.num_samples());
   }
   // Write some extra "metadata" to the file that should be silently ignored
   // by WavReader. We don't use WavWriter directly for this because it doesn't
   // support metadata.
   static const uint8_t kMetadata[] = {101, 202};
   {
     FILE* f = fopen(outfile.c_str(), "ab");
     ASSERT_TRUE(f);
     ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
     fclose(f);
   }
   static const uint8_t kExpectedContents[] = {
       // clang-format off
       // clang formatting doesn't respect inline comments.
     'R', 'I', 'F', 'F',
     42, 0, 0, 0,  // size of whole file - 8: 6 + 44 - 8
     'W', 'A', 'V', 'E',
     'f', 'm', 't', ' ',
     16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
     1, 0,  // format: PCM (1)
     1, 0,  // channels: 1
     0x13, 0x37, 0, 0,  // sample rate: 14099
     0x26, 0x6e, 0, 0,  // byte rate: 2 * 14099
     2, 0,  // block align: NumChannels * BytesPerSample
     16, 0,  // bits per sample: 2 * 8
     'd', 'a', 't', 'a',
     6, 0, 0, 0,  // size of payload: 6
     0, 0,  // first sample: 0.0
     10, 0,  // second sample: 10.0
     0xff, 0x7f,  // third sample: 4e4 (saturated)
     kMetadata[0], kMetadata[1],
       // clang-format on
   };
   static const size_t kContentSize =
       kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
   static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
   EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
   FILE* f = fopen(outfile.c_str(), "rb");
   ASSERT_TRUE(f);
   uint8_t contents[kContentSize];
   ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
   EXPECT_EQ(0, fclose(f));
   EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));

   {
     WavReader r(outfile);
     EXPECT_EQ(14099, r.sample_rate());
     EXPECT_EQ(1u, r.num_channels());
     EXPECT_EQ(kNumSamples, r.num_samples());
     static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
     float samples[kNumSamples];
     EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
     EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
     EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
   }
 }

 // Write a larger WAV file. You can listen to this file to sanity-check it.
 TEST(WavWriterTest, LargeFile) {
   constexpr int kSampleRate = 8000;
   constexpr size_t kNumChannels = 2;
   constexpr size_t kNumSamples = 3 * kSampleRate * kNumChannels;
   for (WavFile::SampleFormat wav_format :
        {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
     for (WavFile::SampleFormat write_format :
          {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
       for (WavFile::SampleFormat read_format :
            {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
         std::string outdir = test::OutputPathWithRandomDirectory();
         std::string outfile = outdir + "wavtest3.wav";
         float samples[kNumSamples];
         for (size_t i = 0; i < kNumSamples; i += kNumChannels) {
           // A nice periodic beeping sound.
           static const double kToneHz = 440;
           const double t =
               static_cast<double>(i) / (kNumChannels * kSampleRate);
           const double x = std::numeric_limits<int16_t>::max() *
                            std::sin(t * kToneHz * 2 * M_PI);
           samples[i] = std::pow(std::sin(t * 2 * 2 * M_PI), 10) * x;
           samples[i + 1] = std::pow(std::cos(t * 2 * 2 * M_PI), 10) * x;
           // See https://issues.webrtc.org/issues/379973428
           RTC_CHECK(isfinite(samples[i]));
           RTC_CHECK(isfinite(samples[i + 1]));
         }
         {
           WavWriter w(outfile, kSampleRate, kNumChannels, wav_format);
           EXPECT_EQ(kSampleRate, w.sample_rate());
           EXPECT_EQ(kNumChannels, w.num_channels());
           EXPECT_EQ(0u, w.num_samples());
           if (write_format == WavFile::SampleFormat::kFloat) {
             int16_t truncated_samples[kNumSamples];
             for (size_t k = 0; k < kNumSamples; ++k) {
               truncated_samples[k] = static_cast<int16_t>(samples[k]);
             }
             w.WriteSamples(truncated_samples, kNumSamples);
           } else {
             w.WriteSamples(samples, kNumSamples);
           }
           EXPECT_EQ(kNumSamples, w.num_samples());
         }
         if (wav_format == WavFile::SampleFormat::kFloat) {
           EXPECT_EQ(sizeof(float) * kNumSamples + kIeeeFloatWavHeaderSize,
                     test::GetFileSize(outfile));
         } else {
           EXPECT_EQ(sizeof(int16_t) * kNumSamples + kPcmWavHeaderSize,
                     test::GetFileSize(outfile));
         }

         {
           WavReader r(outfile);
           EXPECT_EQ(kSampleRate, r.sample_rate());
           EXPECT_EQ(kNumChannels, r.num_channels());
           EXPECT_EQ(kNumSamples, r.num_samples());

           if (read_format == WavFile::SampleFormat::kFloat) {
             float read_samples[kNumSamples];
             EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
             for (size_t i = 0; i < kNumSamples; ++i) {
               EXPECT_NEAR(samples[i], read_samples[i], 1);
               if (!isfinite(samples[i])) {
                 // See https://issues.webrtc.org/issues/379973428
                 RTC_LOG(LS_ERROR)
                     << "samples[" << i << "] is not finite. "
                     << "wav_format=" << SampleFormatToStr(wav_format)
                     << ", write_format=" << SampleFormatToStr(write_format)
                     << ", read_format=" << SampleFormatToStr(read_format);
               }
             }
             EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
           } else {
             int16_t read_samples[kNumSamples];
             EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
             for (size_t i = 0; i < kNumSamples; ++i) {
               EXPECT_NEAR(samples[i], static_cast<float>(read_samples[i]), 1);
               if (!isfinite(samples[i])) {
                 // See https://issues.webrtc.org/issues/379973428
                 RTC_LOG(LS_ERROR)
                     << "samples[" << i << "] is not finite. "
                     << "wav_format=" << SampleFormatToStr(wav_format)
                     << ", write_format=" << SampleFormatToStr(write_format)
                     << ", read_format=" << SampleFormatToStr(read_format);
               }
             }
             EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
           }
         }
         RTC_CHECK(test::RemoveFile(outfile));
         RTC_CHECK(test::RemoveDir(outdir));
       }
     }
   }
 }

 // Write a tiny WAV file with the C++ interface then read-reset-read.
 TEST(WavReaderTest, MAYBE_CPPReset) {
   const std::string outfile =
       test::OutputPathWithRandomDirectory() + "wavtest4.wav";
   static const size_t kNumSamples = 3;
   {
     WavWriter w(outfile, 14099, 1);
     EXPECT_EQ(14099, w.sample_rate());
     EXPECT_EQ(1u, w.num_channels());
     EXPECT_EQ(0u, w.num_samples());
     w.WriteSamples(kSamples, kNumSamples);
     EXPECT_EQ(kNumSamples, w.num_samples());
   }
   // Write some extra "metadata" to the file that should be silently ignored
   // by WavReader. We don't use WavWriter directly for this because it doesn't
   // support metadata.
   static const uint8_t kMetadata[] = {101, 202};
   {
     FILE* f = fopen(outfile.c_str(), "ab");
     ASSERT_TRUE(f);
     ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
     fclose(f);
   }
   static const uint8_t kExpectedContents[] = {
       // clang-format off
       // clang formatting doesn't respect inline comments.
     'R', 'I', 'F', 'F',
     42, 0, 0, 0,  // size of whole file - 8: 6 + 44 - 8
     'W', 'A', 'V', 'E',
     'f', 'm', 't', ' ',
     16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
     1, 0,  // format: PCM (1)
     1, 0,  // channels: 1
     0x13, 0x37, 0, 0,  // sample rate: 14099
     0x26, 0x6e, 0, 0,  // byte rate: 2 * 14099
     2, 0,  // block align: NumChannels * BytesPerSample
     16, 0,  // bits per sample: 2 * 8
     'd', 'a', 't', 'a',
     6, 0, 0, 0,  // size of payload: 6
     0, 0,  // first sample: 0.0
     10, 0,  // second sample: 10.0
     0xff, 0x7f,  // third sample: 4e4 (saturated)
     kMetadata[0], kMetadata[1],
       // clang-format on
   };
   static const size_t kContentSize =
       kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
   static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
   EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
   FILE* f = fopen(outfile.c_str(), "rb");
   ASSERT_TRUE(f);
   uint8_t contents[kContentSize];
   ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
   EXPECT_EQ(0, fclose(f));
   EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));

   {
     WavReader r(outfile);
     EXPECT_EQ(14099, r.sample_rate());
     EXPECT_EQ(1u, r.num_channels());
     EXPECT_EQ(kNumSamples, r.num_samples());
     static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
     float samples[kNumSamples];
     EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
     EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
     EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));

     r.Reset();
     EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
     EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
     EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
   }
 }

 }  // namespace webrtc
	/*
	* Copyright (c) 2014 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.
	*/

	// MSVC++ requires this to be set before any other includes to get M_PI.
	#define _USE_MATH_DEFINES

	#include "common_audio/wav_file.h"

	#include <cmath>
	#include <limits>

	#include "common_audio/wav_header.h"
	#include "rtc_base/logging.h"
	#include "test/gtest.h"
	#include "test/testsupport/file_utils.h"

	// WavWriterTest.CPP flaky on Mac. See webrtc:9247.
	#if defined(WEBRTC_MAC)
	#define MAYBE_CPP DISABLED_CPP
	#define MAYBE_CPPReset DISABLED_CPPReset
	#else
	#define MAYBE_CPP CPP
	#define MAYBE_CPPReset CPPReset
	#endif

	namespace webrtc {

	namespace {
	const char* SampleFormatToStr(WavFile::SampleFormat format) {
	switch (format) {
	case WavFile::SampleFormat::kInt16:
	return "int16";
	case WavFile::SampleFormat::kFloat:
	return "float";
	}
	RTC_CHECK_NOTREACHED();
	}
	} // namespace

	static const float kSamples[] = {0.0, 10.0, 4e4, -1e9};

	// Write a tiny WAV file with the C++ interface and verify the result.
	TEST(WavWriterTest, MAYBE_CPP) {
	const std::string outfile =
	test::OutputPathWithRandomDirectory() + "wavtest1.wav";
	static const size_t kNumSamples = 3;
	{
	WavWriter w(outfile, 14099, 1);
	EXPECT_EQ(14099, w.sample_rate());
	EXPECT_EQ(1u, w.num_channels());
	EXPECT_EQ(0u, w.num_samples());
	w.WriteSamples(kSamples, kNumSamples);
	EXPECT_EQ(kNumSamples, w.num_samples());
	}
	// Write some extra "metadata" to the file that should be silently ignored
	// by WavReader. We don't use WavWriter directly for this because it doesn't
	// support metadata.
	static const uint8_t kMetadata[] = {101, 202};
	{
	FILE* f = fopen(outfile.c_str(), "ab");
	ASSERT_TRUE(f);
	ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
	fclose(f);
	}
	static const uint8_t kExpectedContents[] = {
	// clang-format off
	// clang formatting doesn't respect inline comments.
	'R', 'I', 'F', 'F',
	42, 0, 0, 0, // size of whole file - 8: 6 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	1, 0, // format: PCM (1)
	1, 0, // channels: 1
	0x13, 0x37, 0, 0, // sample rate: 14099
	0x26, 0x6e, 0, 0, // byte rate: 2 * 14099
	2, 0, // block align: NumChannels * BytesPerSample
	16, 0, // bits per sample: 2 * 8
	'd', 'a', 't', 'a',
	6, 0, 0, 0, // size of payload: 6
	0, 0, // first sample: 0.0
	10, 0, // second sample: 10.0
	0xff, 0x7f, // third sample: 4e4 (saturated)
	kMetadata[0], kMetadata[1],
	// clang-format on
	};
	static const size_t kContentSize =
	kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
	static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
	EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
	FILE* f = fopen(outfile.c_str(), "rb");
	ASSERT_TRUE(f);
	uint8_t contents[kContentSize];
	ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
	EXPECT_EQ(0, fclose(f));
	EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));

	{
	WavReader r(outfile);
	EXPECT_EQ(14099, r.sample_rate());
	EXPECT_EQ(1u, r.num_channels());
	EXPECT_EQ(kNumSamples, r.num_samples());
	static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
	float samples[kNumSamples];
	EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
	EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
	}
	}

	// Write a larger WAV file. You can listen to this file to sanity-check it.
	TEST(WavWriterTest, LargeFile) {
	constexpr int kSampleRate = 8000;
	constexpr size_t kNumChannels = 2;
	constexpr size_t kNumSamples = 3 * kSampleRate * kNumChannels;
	for (WavFile::SampleFormat wav_format :
	{WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
	for (WavFile::SampleFormat write_format :
	{WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
	for (WavFile::SampleFormat read_format :
	{WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
	std::string outdir = test::OutputPathWithRandomDirectory();
	std::string outfile = outdir + "wavtest3.wav";
	float samples[kNumSamples];
	for (size_t i = 0; i < kNumSamples; i += kNumChannels) {
	// A nice periodic beeping sound.
	static const double kToneHz = 440;
	const double t =
	static_cast<double>(i) / (kNumChannels * kSampleRate);
	const double x = std::numeric_limits<int16_t>::max() *
	std::sin(t * kToneHz * 2 * M_PI);
	samples[i] = std::pow(std::sin(t * 2 * 2 * M_PI), 10) * x;
	samples[i + 1] = std::pow(std::cos(t * 2 * 2 * M_PI), 10) * x;
	// See https://issues.webrtc.org/issues/379973428
	RTC_CHECK(isfinite(samples[i]));
	RTC_CHECK(isfinite(samples[i + 1]));
	}
	{
	WavWriter w(outfile, kSampleRate, kNumChannels, wav_format);
	EXPECT_EQ(kSampleRate, w.sample_rate());
	EXPECT_EQ(kNumChannels, w.num_channels());
	EXPECT_EQ(0u, w.num_samples());
	if (write_format == WavFile::SampleFormat::kFloat) {
	int16_t truncated_samples[kNumSamples];
	for (size_t k = 0; k < kNumSamples; ++k) {
	truncated_samples[k] = static_cast<int16_t>(samples[k]);
	}
	w.WriteSamples(truncated_samples, kNumSamples);
	} else {
	w.WriteSamples(samples, kNumSamples);
	}
	EXPECT_EQ(kNumSamples, w.num_samples());
	}
	if (wav_format == WavFile::SampleFormat::kFloat) {
	EXPECT_EQ(sizeof(float) * kNumSamples + kIeeeFloatWavHeaderSize,
	test::GetFileSize(outfile));
	} else {
	EXPECT_EQ(sizeof(int16_t) * kNumSamples + kPcmWavHeaderSize,
	test::GetFileSize(outfile));
	}

	{
	WavReader r(outfile);
	EXPECT_EQ(kSampleRate, r.sample_rate());
	EXPECT_EQ(kNumChannels, r.num_channels());
	EXPECT_EQ(kNumSamples, r.num_samples());

	if (read_format == WavFile::SampleFormat::kFloat) {
	float read_samples[kNumSamples];
	EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
	for (size_t i = 0; i < kNumSamples; ++i) {
	EXPECT_NEAR(samples[i], read_samples[i], 1);
	if (!isfinite(samples[i])) {
	// See https://issues.webrtc.org/issues/379973428
	RTC_LOG(LS_ERROR)
	<< "samples[" << i << "] is not finite. "
	<< "wav_format=" << SampleFormatToStr(wav_format)
	<< ", write_format=" << SampleFormatToStr(write_format)
	<< ", read_format=" << SampleFormatToStr(read_format);
	}
	}
	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
	} else {
	int16_t read_samples[kNumSamples];
	EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
	for (size_t i = 0; i < kNumSamples; ++i) {
	EXPECT_NEAR(samples[i], static_cast<float>(read_samples[i]), 1);
	if (!isfinite(samples[i])) {
	// See https://issues.webrtc.org/issues/379973428
	RTC_LOG(LS_ERROR)
	<< "samples[" << i << "] is not finite. "
	<< "wav_format=" << SampleFormatToStr(wav_format)
	<< ", write_format=" << SampleFormatToStr(write_format)
	<< ", read_format=" << SampleFormatToStr(read_format);
	}
	}
	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
	}
	}
	RTC_CHECK(test::RemoveFile(outfile));
	RTC_CHECK(test::RemoveDir(outdir));
	}
	}
	}
	}

	// Write a tiny WAV file with the C++ interface then read-reset-read.
	TEST(WavReaderTest, MAYBE_CPPReset) {
	const std::string outfile =
	test::OutputPathWithRandomDirectory() + "wavtest4.wav";
	static const size_t kNumSamples = 3;
	{
	WavWriter w(outfile, 14099, 1);
	EXPECT_EQ(14099, w.sample_rate());
	EXPECT_EQ(1u, w.num_channels());
	EXPECT_EQ(0u, w.num_samples());
	w.WriteSamples(kSamples, kNumSamples);
	EXPECT_EQ(kNumSamples, w.num_samples());
	}
	// Write some extra "metadata" to the file that should be silently ignored
	// by WavReader. We don't use WavWriter directly for this because it doesn't
	// support metadata.
	static const uint8_t kMetadata[] = {101, 202};
	{
	FILE* f = fopen(outfile.c_str(), "ab");
	ASSERT_TRUE(f);
	ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
	fclose(f);
	}
	static const uint8_t kExpectedContents[] = {
	// clang-format off
	// clang formatting doesn't respect inline comments.
	'R', 'I', 'F', 'F',
	42, 0, 0, 0, // size of whole file - 8: 6 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	1, 0, // format: PCM (1)
	1, 0, // channels: 1
	0x13, 0x37, 0, 0, // sample rate: 14099
	0x26, 0x6e, 0, 0, // byte rate: 2 * 14099
	2, 0, // block align: NumChannels * BytesPerSample
	16, 0, // bits per sample: 2 * 8
	'd', 'a', 't', 'a',
	6, 0, 0, 0, // size of payload: 6
	0, 0, // first sample: 0.0
	10, 0, // second sample: 10.0
	0xff, 0x7f, // third sample: 4e4 (saturated)
	kMetadata[0], kMetadata[1],
	// clang-format on
	};
	static const size_t kContentSize =
	kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
	static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
	EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
	FILE* f = fopen(outfile.c_str(), "rb");
	ASSERT_TRUE(f);
	uint8_t contents[kContentSize];
	ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
	EXPECT_EQ(0, fclose(f));
	EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));

	{
	WavReader r(outfile);
	EXPECT_EQ(14099, r.sample_rate());
	EXPECT_EQ(1u, r.num_channels());
	EXPECT_EQ(kNumSamples, r.num_samples());
	static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
	float samples[kNumSamples];
	EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
	EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));

	r.Reset();
	EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
	EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
	}
	}

	} // namespace webrtc