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/*
* 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