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 <cmath>
 #include <limits>

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

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

 namespace webrtc {

 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::OutputPath() + "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 =
       kWavHeaderSize + 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 tiny WAV file with the C interface and verify the result.
 TEST(WavWriterTest, C) {
   const std::string outfile = test::OutputPath() + "wavtest2.wav";
   rtc_WavWriter* w = rtc_WavOpen(outfile.c_str(), 11904, 2);
   EXPECT_EQ(11904, rtc_WavSampleRate(w));
   EXPECT_EQ(2u, rtc_WavNumChannels(w));
   EXPECT_EQ(0u, rtc_WavNumSamples(w));
   static const size_t kNumSamples = 4;
   rtc_WavWriteSamples(w, &kSamples[0], 2);
   EXPECT_EQ(2u, rtc_WavNumSamples(w));
   rtc_WavWriteSamples(w, &kSamples[2], kNumSamples - 2);
   EXPECT_EQ(kNumSamples, rtc_WavNumSamples(w));
   rtc_WavClose(w);
   static const uint8_t kExpectedContents[] = {
       // clang-format off
       // clang formatting doesn't respect inline comments.
     'R', 'I', 'F', 'F',
     44, 0, 0, 0,  // size of whole file - 8: 8 + 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)
     2, 0,  // channels: 2
     0x80, 0x2e, 0, 0,  // sample rate: 11904
     0, 0xba, 0, 0,  // byte rate: 2 * 2 * 11904
     4, 0,  // block align: NumChannels * BytesPerSample
     16, 0,  // bits per sample: 2 * 8
     'd', 'a', 't', 'a',
     8, 0, 0, 0,  // size of payload: 8
     0, 0,  // first sample: 0.0
     10, 0,  // second sample: 10.0
     0xff, 0x7f,  // third sample: 4e4 (saturated)
     0, 0x80,  // fourth sample: -1e9 (saturated)
       // clang-format on
   };
   static const size_t kContentSize =
       kWavHeaderSize + kNumSamples * sizeof(int16_t);
   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));
 }

 // Write a larger WAV file. You can listen to this file to sanity-check it.
 TEST(WavWriterTest, LargeFile) {
   std::string outfile = test::OutputPath() + "wavtest3.wav";
   static const int kSampleRate = 8000;
   static const size_t kNumChannels = 2;
   static const size_t kNumSamples = 3 * kSampleRate * kNumChannels;
   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;
   }
   {
     WavWriter w(outfile, kSampleRate, kNumChannels);
     EXPECT_EQ(kSampleRate, w.sample_rate());
     EXPECT_EQ(kNumChannels, w.num_channels());
     EXPECT_EQ(0u, w.num_samples());
     w.WriteSamples(samples, kNumSamples);
     EXPECT_EQ(kNumSamples, w.num_samples());
   }
   EXPECT_EQ(sizeof(int16_t) * kNumSamples + kWavHeaderSize,
             test::GetFileSize(outfile));

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

     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);

     EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
   }
 }

 // Write a tiny WAV file with the the std::FILE interface and verify the
 // result.
 TEST(WavWriterTest, MAYBE_CPPFileDescriptor) {
   const std::string outfile = test::OutputPath() + "wavtest1.wav";
   static constexpr size_t kNumSamples = 3;
   {
     WavWriter w(rtc::CreatePlatformFile(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 constexpr 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 constexpr size_t kContentSize =
       kWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
   static_assert(sizeof(kExpectedContents) == kContentSize, "");
   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(rtc::OpenPlatformFileReadOnly(outfile));
     EXPECT_EQ(14099, r.sample_rate());
     EXPECT_EQ(1u, r.num_channels());
     EXPECT_EQ(kNumSamples, r.num_samples());
     static constexpr 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 tiny WAV file with the C++ interface then read-reset-read.
 TEST(WavReaderTest, MAYBE_CPPReset) {
   const std::string outfile = test::OutputPath() + "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 =
       kWavHeaderSize + 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 <cmath>
	#include <limits>

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

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

	namespace webrtc {

	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::OutputPath() + "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 =
	kWavHeaderSize + 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 tiny WAV file with the C interface and verify the result.
	TEST(WavWriterTest, C) {
	const std::string outfile = test::OutputPath() + "wavtest2.wav";
	rtc_WavWriter* w = rtc_WavOpen(outfile.c_str(), 11904, 2);
	EXPECT_EQ(11904, rtc_WavSampleRate(w));
	EXPECT_EQ(2u, rtc_WavNumChannels(w));
	EXPECT_EQ(0u, rtc_WavNumSamples(w));
	static const size_t kNumSamples = 4;
	rtc_WavWriteSamples(w, &kSamples[0], 2);
	EXPECT_EQ(2u, rtc_WavNumSamples(w));
	rtc_WavWriteSamples(w, &kSamples[2], kNumSamples - 2);
	EXPECT_EQ(kNumSamples, rtc_WavNumSamples(w));
	rtc_WavClose(w);
	static const uint8_t kExpectedContents[] = {
	// clang-format off
	// clang formatting doesn't respect inline comments.
	'R', 'I', 'F', 'F',
	44, 0, 0, 0, // size of whole file - 8: 8 + 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)
	2, 0, // channels: 2
	0x80, 0x2e, 0, 0, // sample rate: 11904
	0, 0xba, 0, 0, // byte rate: 2 * 2 * 11904
	4, 0, // block align: NumChannels * BytesPerSample
	16, 0, // bits per sample: 2 * 8
	'd', 'a', 't', 'a',
	8, 0, 0, 0, // size of payload: 8
	0, 0, // first sample: 0.0
	10, 0, // second sample: 10.0
	0xff, 0x7f, // third sample: 4e4 (saturated)
	0, 0x80, // fourth sample: -1e9 (saturated)
	// clang-format on
	};
	static const size_t kContentSize =
	kWavHeaderSize + kNumSamples * sizeof(int16_t);
	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));
	}

	// Write a larger WAV file. You can listen to this file to sanity-check it.
	TEST(WavWriterTest, LargeFile) {
	std::string outfile = test::OutputPath() + "wavtest3.wav";
	static const int kSampleRate = 8000;
	static const size_t kNumChannels = 2;
	static const size_t kNumSamples = 3 * kSampleRate * kNumChannels;
	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;
	}
	{
	WavWriter w(outfile, kSampleRate, kNumChannels);
	EXPECT_EQ(kSampleRate, w.sample_rate());
	EXPECT_EQ(kNumChannels, w.num_channels());
	EXPECT_EQ(0u, w.num_samples());
	w.WriteSamples(samples, kNumSamples);
	EXPECT_EQ(kNumSamples, w.num_samples());
	}
	EXPECT_EQ(sizeof(int16_t) * kNumSamples + kWavHeaderSize,
	test::GetFileSize(outfile));

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

	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);

	EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
	}
	}

	// Write a tiny WAV file with the the std::FILE interface and verify the
	// result.
	TEST(WavWriterTest, MAYBE_CPPFileDescriptor) {
	const std::string outfile = test::OutputPath() + "wavtest1.wav";
	static constexpr size_t kNumSamples = 3;
	{
	WavWriter w(rtc::CreatePlatformFile(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 constexpr 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 constexpr size_t kContentSize =
	kWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
	static_assert(sizeof(kExpectedContents) == kContentSize, "");
	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(rtc::OpenPlatformFileReadOnly(outfile));
	EXPECT_EQ(14099, r.sample_rate());
	EXPECT_EQ(1u, r.num_channels());
	EXPECT_EQ(kNumSamples, r.num_samples());
	static constexpr 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 tiny WAV file with the C++ interface then read-reset-read.
	TEST(WavReaderTest, MAYBE_CPPReset) {
	const std::string outfile = test::OutputPath() + "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 =
	kWavHeaderSize + 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