2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 // MSVC++ requires this to be set before any other includes to get M_PI.
12 #define _USE_MATH_DEFINES
17 #include "testing/gtest/include/gtest/gtest.h"
18 #include "webrtc/base/compile_assert.h"
19 #include "webrtc/common_audio/wav_header.h"
20 #include "webrtc/common_audio/wav_writer.h"
21 #include "webrtc/test/testsupport/fileutils.h"
23 static const float kSamples[] = {0.0, 10.0, 4e4, -1e9};
25 // Write a tiny WAV file with the C++ interface and verify the result.
26 TEST(WavWriterTest, CPP) {
27 const std::string outfile = webrtc::test::OutputPath() + "wavtest1.wav";
28 static const uint32_t kNumSamples = 3;
30 webrtc::WavFile w(outfile, 14099, 1);
31 EXPECT_EQ(14099, w.sample_rate());
32 EXPECT_EQ(1, w.num_channels());
33 EXPECT_EQ(0u, w.num_samples());
34 w.WriteSamples(kSamples, kNumSamples);
35 EXPECT_EQ(kNumSamples, w.num_samples());
37 static const uint8_t kExpectedContents[] = {
39 42, 0, 0, 0, // size of whole file - 8: 6 + 44 - 8
42 16, 0, 0, 0, // size of fmt block - 8: 24 - 8
43 1, 0, // format: PCM (1)
45 0x13, 0x37, 0, 0, // sample rate: 14099
46 0x26, 0x6e, 0, 0, // byte rate: 2 * 14099
47 2, 0, // block align: NumChannels * BytesPerSample
48 16, 0, // bits per sample: 2 * 8
50 6, 0, 0, 0, // size of payload: 6
51 0, 0, // first sample: 0.0
52 10, 0, // second sample: 10.0
53 0xff, 0x7f, // third sample: 4e4 (saturated)
55 static const int kContentSize =
56 webrtc::kWavHeaderSize + kNumSamples * sizeof(int16_t);
57 COMPILE_ASSERT(sizeof(kExpectedContents) == kContentSize, content_size);
58 EXPECT_EQ(size_t(kContentSize), webrtc::test::GetFileSize(outfile));
59 FILE* f = fopen(outfile.c_str(), "rb");
61 uint8_t contents[kContentSize];
62 ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
63 EXPECT_EQ(0, fclose(f));
64 EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
67 // Write a tiny WAV file with the C interface and verify the result.
68 TEST(WavWriterTest, C) {
69 const std::string outfile = webrtc::test::OutputPath() + "wavtest2.wav";
70 rtc_WavFile *w = rtc_WavOpen(outfile.c_str(), 11904, 2);
71 EXPECT_EQ(11904, rtc_WavSampleRate(w));
72 EXPECT_EQ(2, rtc_WavNumChannels(w));
73 EXPECT_EQ(0u, rtc_WavNumSamples(w));
74 static const uint32_t kNumSamples = 4;
75 rtc_WavWriteSamples(w, &kSamples[0], 2);
76 EXPECT_EQ(2u, rtc_WavNumSamples(w));
77 rtc_WavWriteSamples(w, &kSamples[2], kNumSamples - 2);
78 EXPECT_EQ(kNumSamples, rtc_WavNumSamples(w));
80 static const uint8_t kExpectedContents[] = {
82 44, 0, 0, 0, // size of whole file - 8: 8 + 44 - 8
85 16, 0, 0, 0, // size of fmt block - 8: 24 - 8
86 1, 0, // format: PCM (1)
88 0x80, 0x2e, 0, 0, // sample rate: 11904
89 0, 0xba, 0, 0, // byte rate: 2 * 2 * 11904
90 4, 0, // block align: NumChannels * BytesPerSample
91 16, 0, // bits per sample: 2 * 8
93 8, 0, 0, 0, // size of payload: 8
94 0, 0, // first sample: 0.0
95 10, 0, // second sample: 10.0
96 0xff, 0x7f, // third sample: 4e4 (saturated)
97 0, 0x80, // fourth sample: -1e9 (saturated)
99 static const int kContentSize =
100 webrtc::kWavHeaderSize + kNumSamples * sizeof(int16_t);
101 COMPILE_ASSERT(sizeof(kExpectedContents) == kContentSize, content_size);
102 EXPECT_EQ(size_t(kContentSize), webrtc::test::GetFileSize(outfile));
103 FILE* f = fopen(outfile.c_str(), "rb");
105 uint8_t contents[kContentSize];
106 ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
107 EXPECT_EQ(0, fclose(f));
108 EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
111 // Write a larger WAV file. You can listen to this file to sanity-check it.
112 TEST(WavWriterTest, LargeFile) {
113 std::string outfile = webrtc::test::OutputPath() + "wavtest3.wav";
114 static const int kSampleRate = 8000;
115 static const int kNumChannels = 2;
116 static const uint32_t kNumSamples = 3 * kSampleRate * kNumChannels;
117 float samples[kNumSamples];
118 for (uint32_t i = 0; i < kNumSamples; i += kNumChannels) {
119 // A nice periodic beeping sound.
120 static const double kToneHz = 440;
121 const double t = static_cast<double>(i) / (kNumChannels * kSampleRate);
123 std::numeric_limits<int16_t>::max() * std::sin(t * kToneHz * 2 * M_PI);
124 samples[i] = std::pow(std::sin(t * 2 * 2 * M_PI), 10) * x;
125 samples[i + 1] = std::pow(std::cos(t * 2 * 2 * M_PI), 10) * x;
128 webrtc::WavFile w(outfile, kSampleRate, kNumChannels);
129 EXPECT_EQ(kSampleRate, w.sample_rate());
130 EXPECT_EQ(kNumChannels, w.num_channels());
131 EXPECT_EQ(0u, w.num_samples());
132 w.WriteSamples(samples, kNumSamples);
133 EXPECT_EQ(kNumSamples, w.num_samples());
135 EXPECT_EQ(sizeof(int16_t) * kNumSamples + webrtc::kWavHeaderSize,
136 webrtc::test::GetFileSize(outfile));