common_audio/wav_header_unittest.cc - src/webrtc - 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.
  */

 #include <limits>

 #include "webrtc/common_audio/wav_header.h"
 #include "webrtc/test/gtest.h"

 namespace webrtc {

 // Doesn't take ownership of the buffer.
 class ReadableWavBuffer : public ReadableWav {
  public:
   ReadableWavBuffer(const uint8_t* buf, size_t size)
       : buf_(buf),
         size_(size),
         pos_(0),
         buf_exhausted_(false),
         check_read_size_(true) {}
   ReadableWavBuffer(const uint8_t* buf, size_t size, bool check_read_size)
       : buf_(buf),
         size_(size),
         pos_(0),
         buf_exhausted_(false),
         check_read_size_(check_read_size) {}

   virtual ~ReadableWavBuffer() {
     // Verify the entire buffer has been read.
     if (check_read_size_)
       EXPECT_EQ(size_, pos_);
   }

   virtual size_t Read(void* buf, size_t num_bytes) {
     // Verify we don't try to read outside of a properly sized header.
     if (size_ >= kWavHeaderSize)
       EXPECT_GE(size_, pos_ + num_bytes);
     EXPECT_FALSE(buf_exhausted_);

     const size_t bytes_remaining = size_ - pos_;
     if (num_bytes > bytes_remaining) {
       // The caller is signalled about an exhausted buffer when we return fewer
       // bytes than requested. There should not be another read attempt after
       // this point.
       buf_exhausted_ = true;
       num_bytes = bytes_remaining;
     }
     memcpy(buf, &buf_[pos_], num_bytes);
     pos_ += num_bytes;
     return num_bytes;
   }

  private:
   const uint8_t* buf_;
   const size_t size_;
   size_t pos_;
   bool buf_exhausted_;
   const bool check_read_size_;
 };

 // Try various choices of WAV header parameters, and make sure that the good
 // ones are accepted and the bad ones rejected.
 TEST(WavHeaderTest, CheckWavParameters) {
   // Try some really stupid values for one parameter at a time.
   EXPECT_TRUE(CheckWavParameters(1, 8000, kWavFormatPcm, 1, 0));
   EXPECT_FALSE(CheckWavParameters(0, 8000, kWavFormatPcm, 1, 0));
   EXPECT_FALSE(CheckWavParameters(0x10000, 8000, kWavFormatPcm, 1, 0));
   EXPECT_FALSE(CheckWavParameters(1, 0, kWavFormatPcm, 1, 0));
   EXPECT_FALSE(CheckWavParameters(1, 8000, WavFormat(0), 1, 0));
   EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatPcm, 0, 0));

   // Try invalid format/bytes-per-sample combinations.
   EXPECT_TRUE(CheckWavParameters(1, 8000, kWavFormatPcm, 2, 0));
   EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatPcm, 4, 0));
   EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatALaw, 2, 0));
   EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatMuLaw, 2, 0));

   // Too large values.
   EXPECT_FALSE(CheckWavParameters(1 << 20, 1 << 20, kWavFormatPcm, 1, 0));
   EXPECT_FALSE(CheckWavParameters(
       1, 8000, kWavFormatPcm, 1, std::numeric_limits<uint32_t>::max()));

   // Not the same number of samples for each channel.
   EXPECT_FALSE(CheckWavParameters(3, 8000, kWavFormatPcm, 1, 5));
 }

 TEST(WavHeaderTest, ReadWavHeaderWithErrors) {
   size_t num_channels = 0;
   int sample_rate = 0;
   WavFormat format = kWavFormatPcm;
   size_t bytes_per_sample = 0;
   size_t num_samples = 0;

   // Test a few ways the header can be invalid. We start with the valid header
   // used in WriteAndReadWavHeader, and invalidate one field per test. The
   // invalid field is indicated in the array name, and in the comments with
   // *BAD*.
   {
     static const uint8_t kBadRiffID[] = {
       'R', 'i', 'f', 'f',  // *BAD*
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
       17, 0,  // block align: NumChannels * BytesPerSample
       8, 0,  // bits per sample: 1 * 8
       'd', 'a', 't', 'a',
       0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     };
     ReadableWavBuffer r(kBadRiffID, sizeof(kBadRiffID));
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kBadBitsPerSample[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
       17, 0,  // block align: NumChannels * BytesPerSample
       1, 0,  // bits per sample: *BAD*
       'd', 'a', 't', 'a',
       0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     };
     ReadableWavBuffer r(kBadBitsPerSample, sizeof(kBadBitsPerSample));
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kBadByteRate[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0x00, 0x33, 0x03, 0,  // byte rate: *BAD*
       17, 0,  // block align: NumChannels * BytesPerSample
       8, 0,  // bits per sample: 1 * 8
       'd', 'a', 't', 'a',
       0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     };
     ReadableWavBuffer r(kBadByteRate, sizeof(kBadByteRate));
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kBadFmtHeaderSize[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       17, 0, 0, 0,  // size of fmt block *BAD*. Only 16 and 18 permitted.
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
       17, 0,  // block align: NumChannels * BytesPerSample
       8, 0,  // bits per sample: 1 * 8
       0,  // extra (though invalid) header byte
       'd', 'a', 't', 'a',
       0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     };
     ReadableWavBuffer r(kBadFmtHeaderSize, sizeof(kBadFmtHeaderSize), false);
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kNonZeroExtensionField[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       18, 0, 0, 0,  // size of fmt block - 8: 24 - 8
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
       17, 0,  // block align: NumChannels * BytesPerSample
       8, 0,  // bits per sample: 1 * 8
       1, 0,  // non-zero extension field *BAD*
       'd', 'a', 't', 'a',
       0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     };
     ReadableWavBuffer r(kNonZeroExtensionField, sizeof(kNonZeroExtensionField),
                         false);
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kMissingDataChunk[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
       'f', 'm', 't', ' ',
       16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
       6, 0,  // format: A-law (6)
       17, 0,  // channels: 17
       0x39, 0x30, 0, 0,  // sample rate: 12345
       0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
       17, 0,  // block align: NumChannels * BytesPerSample
       8, 0,  // bits per sample: 1 * 8
     };
     ReadableWavBuffer r(kMissingDataChunk, sizeof(kMissingDataChunk));
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
   {
     static const uint8_t kMissingFmtAndDataChunks[] = {
       'R', 'I', 'F', 'F',
       0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
       'W', 'A', 'V', 'E',
     };
     ReadableWavBuffer r(kMissingFmtAndDataChunks,
                         sizeof(kMissingFmtAndDataChunks));
     EXPECT_FALSE(
         ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                       &bytes_per_sample, &num_samples));
   }
 }

 // Try writing and reading a valid WAV header and make sure it looks OK.
 TEST(WavHeaderTest, WriteAndReadWavHeader) {
   static const int kSize = 4 + kWavHeaderSize + 4;
   uint8_t buf[kSize];
   memset(buf, 0xa4, sizeof(buf));
   WriteWavHeader(buf + 4, 17, 12345, kWavFormatALaw, 1, 123457689);
   static const uint8_t kExpectedBuf[] = {
     0xa4, 0xa4, 0xa4, 0xa4,  // untouched bytes before header
     'R', 'I', 'F', 'F',
     0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
     'W', 'A', 'V', 'E',
     'f', 'm', 't', ' ',
     16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
     6, 0,  // format: A-law (6)
     17, 0,  // channels: 17
     0x39, 0x30, 0, 0,  // sample rate: 12345
     0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
     17, 0,  // block align: NumChannels * BytesPerSample
     8, 0,  // bits per sample: 1 * 8
     'd', 'a', 't', 'a',
     0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
     0xa4, 0xa4, 0xa4, 0xa4,  // untouched bytes after header
   };
   static_assert(sizeof(kExpectedBuf) == kSize, "buffer size");
   EXPECT_EQ(0, memcmp(kExpectedBuf, buf, kSize));

   size_t num_channels = 0;
   int sample_rate = 0;
   WavFormat format = kWavFormatPcm;
   size_t bytes_per_sample = 0;
   size_t num_samples = 0;
   ReadableWavBuffer r(buf + 4, sizeof(buf) - 8);
   EXPECT_TRUE(
       ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                     &bytes_per_sample, &num_samples));
   EXPECT_EQ(17u, num_channels);
   EXPECT_EQ(12345, sample_rate);
   EXPECT_EQ(kWavFormatALaw, format);
   EXPECT_EQ(1u, bytes_per_sample);
   EXPECT_EQ(123457689u, num_samples);
 }

 // Try reading an atypical but valid WAV header and make sure it's parsed OK.
 TEST(WavHeaderTest, ReadAtypicalWavHeader) {
   static const uint8_t kBuf[] = {
     'R', 'I', 'F', 'F',
     0x3d, 0xd1, 0x5b, 0x07,  // size of whole file - 8 + an extra 128 bytes of
                              // "metadata": 123457689 + 44 - 8 + 128. (atypical)
     'W', 'A', 'V', 'E',
     'f', 'm', 't', ' ',
     18, 0, 0, 0,  // size of fmt block (with an atypical extension size field)
     6, 0,  // format: A-law (6)
     17, 0,  // channels: 17
     0x39, 0x30, 0, 0,  // sample rate: 12345
     0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
     17, 0,  // block align: NumChannels * BytesPerSample
     8, 0,  // bits per sample: 1 * 8
     0, 0,  // zero extension size field (atypical)
     'd', 'a', 't', 'a',
     0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
   };

   size_t num_channels = 0;
   int sample_rate = 0;
   WavFormat format = kWavFormatPcm;
   size_t bytes_per_sample = 0;
   size_t num_samples = 0;
   ReadableWavBuffer r(kBuf, sizeof(kBuf));
   EXPECT_TRUE(
       ReadWavHeader(&r, &num_channels, &sample_rate, &format,
                     &bytes_per_sample, &num_samples));
   EXPECT_EQ(17u, num_channels);
   EXPECT_EQ(12345, sample_rate);
   EXPECT_EQ(kWavFormatALaw, format);
   EXPECT_EQ(1u, bytes_per_sample);
   EXPECT_EQ(123457689u, num_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.
	*/

	#include <limits>

	#include "webrtc/common_audio/wav_header.h"
	#include "webrtc/test/gtest.h"

	namespace webrtc {

	// Doesn't take ownership of the buffer.
	class ReadableWavBuffer : public ReadableWav {
	public:
	ReadableWavBuffer(const uint8_t* buf, size_t size)
	: buf_(buf),
	size_(size),
	pos_(0),
	buf_exhausted_(false),
	check_read_size_(true) {}
	ReadableWavBuffer(const uint8_t* buf, size_t size, bool check_read_size)
	: buf_(buf),
	size_(size),
	pos_(0),
	buf_exhausted_(false),
	check_read_size_(check_read_size) {}

	virtual ~ReadableWavBuffer() {
	// Verify the entire buffer has been read.
	if (check_read_size_)
	EXPECT_EQ(size_, pos_);
	}

	virtual size_t Read(void* buf, size_t num_bytes) {
	// Verify we don't try to read outside of a properly sized header.
	if (size_ >= kWavHeaderSize)
	EXPECT_GE(size_, pos_ + num_bytes);
	EXPECT_FALSE(buf_exhausted_);

	const size_t bytes_remaining = size_ - pos_;
	if (num_bytes > bytes_remaining) {
	// The caller is signalled about an exhausted buffer when we return fewer
	// bytes than requested. There should not be another read attempt after
	// this point.
	buf_exhausted_ = true;
	num_bytes = bytes_remaining;
	}
	memcpy(buf, &buf_[pos_], num_bytes);
	pos_ += num_bytes;
	return num_bytes;
	}

	private:
	const uint8_t* buf_;
	const size_t size_;
	size_t pos_;
	bool buf_exhausted_;
	const bool check_read_size_;
	};

	// Try various choices of WAV header parameters, and make sure that the good
	// ones are accepted and the bad ones rejected.
	TEST(WavHeaderTest, CheckWavParameters) {
	// Try some really stupid values for one parameter at a time.
	EXPECT_TRUE(CheckWavParameters(1, 8000, kWavFormatPcm, 1, 0));
	EXPECT_FALSE(CheckWavParameters(0, 8000, kWavFormatPcm, 1, 0));
	EXPECT_FALSE(CheckWavParameters(0x10000, 8000, kWavFormatPcm, 1, 0));
	EXPECT_FALSE(CheckWavParameters(1, 0, kWavFormatPcm, 1, 0));
	EXPECT_FALSE(CheckWavParameters(1, 8000, WavFormat(0), 1, 0));
	EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatPcm, 0, 0));

	// Try invalid format/bytes-per-sample combinations.
	EXPECT_TRUE(CheckWavParameters(1, 8000, kWavFormatPcm, 2, 0));
	EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatPcm, 4, 0));
	EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatALaw, 2, 0));
	EXPECT_FALSE(CheckWavParameters(1, 8000, kWavFormatMuLaw, 2, 0));

	// Too large values.
	EXPECT_FALSE(CheckWavParameters(1 << 20, 1 << 20, kWavFormatPcm, 1, 0));
	EXPECT_FALSE(CheckWavParameters(
	1, 8000, kWavFormatPcm, 1, std::numeric_limits<uint32_t>::max()));

	// Not the same number of samples for each channel.
	EXPECT_FALSE(CheckWavParameters(3, 8000, kWavFormatPcm, 1, 5));
	}

	TEST(WavHeaderTest, ReadWavHeaderWithErrors) {
	size_t num_channels = 0;
	int sample_rate = 0;
	WavFormat format = kWavFormatPcm;
	size_t bytes_per_sample = 0;
	size_t num_samples = 0;

	// Test a few ways the header can be invalid. We start with the valid header
	// used in WriteAndReadWavHeader, and invalidate one field per test. The
	// invalid field is indicated in the array name, and in the comments with
	// BAD.
	{
	static const uint8_t kBadRiffID[] = {
	'R', 'i', 'f', 'f', // BAD
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};
	ReadableWavBuffer r(kBadRiffID, sizeof(kBadRiffID));
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kBadBitsPerSample[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	1, 0, // bits per sample: BAD
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};
	ReadableWavBuffer r(kBadBitsPerSample, sizeof(kBadBitsPerSample));
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kBadByteRate[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0x00, 0x33, 0x03, 0, // byte rate: BAD
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};
	ReadableWavBuffer r(kBadByteRate, sizeof(kBadByteRate));
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kBadFmtHeaderSize[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	17, 0, 0, 0, // size of fmt block BAD. Only 16 and 18 permitted.
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	0, // extra (though invalid) header byte
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};
	ReadableWavBuffer r(kBadFmtHeaderSize, sizeof(kBadFmtHeaderSize), false);
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kNonZeroExtensionField[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	18, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	1, 0, // non-zero extension field BAD
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};
	ReadableWavBuffer r(kNonZeroExtensionField, sizeof(kNonZeroExtensionField),
	false);
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kMissingDataChunk[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	};
	ReadableWavBuffer r(kMissingDataChunk, sizeof(kMissingDataChunk));
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	{
	static const uint8_t kMissingFmtAndDataChunks[] = {
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	};
	ReadableWavBuffer r(kMissingFmtAndDataChunks,
	sizeof(kMissingFmtAndDataChunks));
	EXPECT_FALSE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	}
	}

	// Try writing and reading a valid WAV header and make sure it looks OK.
	TEST(WavHeaderTest, WriteAndReadWavHeader) {
	static const int kSize = 4 + kWavHeaderSize + 4;
	uint8_t buf[kSize];
	memset(buf, 0xa4, sizeof(buf));
	WriteWavHeader(buf + 4, 17, 12345, kWavFormatALaw, 1, 123457689);
	static const uint8_t kExpectedBuf[] = {
	0xa4, 0xa4, 0xa4, 0xa4, // untouched bytes before header
	'R', 'I', 'F', 'F',
	0xbd, 0xd0, 0x5b, 0x07, // size of whole file - 8: 123457689 + 44 - 8
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	16, 0, 0, 0, // size of fmt block - 8: 24 - 8
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	0xa4, 0xa4, 0xa4, 0xa4, // untouched bytes after header
	};
	static_assert(sizeof(kExpectedBuf) == kSize, "buffer size");
	EXPECT_EQ(0, memcmp(kExpectedBuf, buf, kSize));

	size_t num_channels = 0;
	int sample_rate = 0;
	WavFormat format = kWavFormatPcm;
	size_t bytes_per_sample = 0;
	size_t num_samples = 0;
	ReadableWavBuffer r(buf + 4, sizeof(buf) - 8);
	EXPECT_TRUE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	EXPECT_EQ(17u, num_channels);
	EXPECT_EQ(12345, sample_rate);
	EXPECT_EQ(kWavFormatALaw, format);
	EXPECT_EQ(1u, bytes_per_sample);
	EXPECT_EQ(123457689u, num_samples);
	}

	// Try reading an atypical but valid WAV header and make sure it's parsed OK.
	TEST(WavHeaderTest, ReadAtypicalWavHeader) {
	static const uint8_t kBuf[] = {
	'R', 'I', 'F', 'F',
	0x3d, 0xd1, 0x5b, 0x07, // size of whole file - 8 + an extra 128 bytes of
	// "metadata": 123457689 + 44 - 8 + 128. (atypical)
	'W', 'A', 'V', 'E',
	'f', 'm', 't', ' ',
	18, 0, 0, 0, // size of fmt block (with an atypical extension size field)
	6, 0, // format: A-law (6)
	17, 0, // channels: 17
	0x39, 0x30, 0, 0, // sample rate: 12345
	0xc9, 0x33, 0x03, 0, // byte rate: 1 * 17 * 12345
	17, 0, // block align: NumChannels * BytesPerSample
	8, 0, // bits per sample: 1 * 8
	0, 0, // zero extension size field (atypical)
	'd', 'a', 't', 'a',
	0x99, 0xd0, 0x5b, 0x07, // size of payload: 123457689
	};

	size_t num_channels = 0;
	int sample_rate = 0;
	WavFormat format = kWavFormatPcm;
	size_t bytes_per_sample = 0;
	size_t num_samples = 0;
	ReadableWavBuffer r(kBuf, sizeof(kBuf));
	EXPECT_TRUE(
	ReadWavHeader(&r, &num_channels, &sample_rate, &format,
	&bytes_per_sample, &num_samples));
	EXPECT_EQ(17u, num_channels);
	EXPECT_EQ(12345, sample_rate);
	EXPECT_EQ(kWavFormatALaw, format);
	EXPECT_EQ(1u, bytes_per_sample);
	EXPECT_EQ(123457689u, num_samples);
	}

	} // namespace webrtc