/*
* 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 "testing/gtest/include/gtest/gtest.h"
#include "webrtc/common_audio/wav_header.h"
#include "webrtc/common_audio/wav_file.h"
#include "webrtc/test/testsupport/fileutils.h"
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, 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[] = {
'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],
};
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[] = {
'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)
};
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));
}
}
} // namespace webrtc