178 lines
6.5 KiB
C++
178 lines
6.5 KiB
C++
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// MSVC++ requires this to be set before any other includes to get M_PI.
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#define _USE_MATH_DEFINES
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#include <cmath>
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#include <limits>
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#include "testing/gtest/include/gtest/gtest.h"
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#include "webrtc/common_audio/wav_header.h"
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#include "webrtc/common_audio/wav_file.h"
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#include "webrtc/test/testsupport/fileutils.h"
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namespace webrtc {
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static const float kSamples[] = {0.0, 10.0, 4e4, -1e9};
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// Write a tiny WAV file with the C++ interface and verify the result.
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TEST(WavWriterTest, CPP) {
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const std::string outfile = test::OutputPath() + "wavtest1.wav";
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static const size_t kNumSamples = 3;
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{
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WavWriter w(outfile, 14099, 1);
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EXPECT_EQ(14099, w.sample_rate());
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EXPECT_EQ(1u, w.num_channels());
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EXPECT_EQ(0u, w.num_samples());
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w.WriteSamples(kSamples, kNumSamples);
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EXPECT_EQ(kNumSamples, w.num_samples());
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}
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// Write some extra "metadata" to the file that should be silently ignored
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// by WavReader. We don't use WavWriter directly for this because it doesn't
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// support metadata.
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static const uint8_t kMetadata[] = {101, 202};
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{
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FILE* f = fopen(outfile.c_str(), "ab");
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ASSERT_TRUE(f);
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ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
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fclose(f);
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}
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static const uint8_t kExpectedContents[] = {
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'R', 'I', 'F', 'F',
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42, 0, 0, 0, // size of whole file - 8: 6 + 44 - 8
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'W', 'A', 'V', 'E',
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'f', 'm', 't', ' ',
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16, 0, 0, 0, // size of fmt block - 8: 24 - 8
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1, 0, // format: PCM (1)
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1, 0, // channels: 1
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0x13, 0x37, 0, 0, // sample rate: 14099
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0x26, 0x6e, 0, 0, // byte rate: 2 * 14099
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2, 0, // block align: NumChannels * BytesPerSample
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16, 0, // bits per sample: 2 * 8
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'd', 'a', 't', 'a',
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6, 0, 0, 0, // size of payload: 6
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0, 0, // first sample: 0.0
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10, 0, // second sample: 10.0
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0xff, 0x7f, // third sample: 4e4 (saturated)
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kMetadata[0], kMetadata[1],
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};
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static const size_t kContentSize =
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kWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
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static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
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EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
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FILE* f = fopen(outfile.c_str(), "rb");
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ASSERT_TRUE(f);
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uint8_t contents[kContentSize];
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ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
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EXPECT_EQ(0, fclose(f));
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EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
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{
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WavReader r(outfile);
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EXPECT_EQ(14099, r.sample_rate());
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EXPECT_EQ(1u, r.num_channels());
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EXPECT_EQ(kNumSamples, r.num_samples());
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static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
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float samples[kNumSamples];
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EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
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EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
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EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
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}
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}
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// Write a tiny WAV file with the C interface and verify the result.
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TEST(WavWriterTest, C) {
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const std::string outfile = test::OutputPath() + "wavtest2.wav";
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rtc_WavWriter* w = rtc_WavOpen(outfile.c_str(), 11904, 2);
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EXPECT_EQ(11904, rtc_WavSampleRate(w));
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EXPECT_EQ(2u, rtc_WavNumChannels(w));
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EXPECT_EQ(0u, rtc_WavNumSamples(w));
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static const size_t kNumSamples = 4;
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rtc_WavWriteSamples(w, &kSamples[0], 2);
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EXPECT_EQ(2u, rtc_WavNumSamples(w));
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rtc_WavWriteSamples(w, &kSamples[2], kNumSamples - 2);
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EXPECT_EQ(kNumSamples, rtc_WavNumSamples(w));
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rtc_WavClose(w);
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static const uint8_t kExpectedContents[] = {
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'R', 'I', 'F', 'F',
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44, 0, 0, 0, // size of whole file - 8: 8 + 44 - 8
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'W', 'A', 'V', 'E',
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'f', 'm', 't', ' ',
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16, 0, 0, 0, // size of fmt block - 8: 24 - 8
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1, 0, // format: PCM (1)
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2, 0, // channels: 2
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0x80, 0x2e, 0, 0, // sample rate: 11904
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0, 0xba, 0, 0, // byte rate: 2 * 2 * 11904
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4, 0, // block align: NumChannels * BytesPerSample
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16, 0, // bits per sample: 2 * 8
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'd', 'a', 't', 'a',
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8, 0, 0, 0, // size of payload: 8
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0, 0, // first sample: 0.0
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10, 0, // second sample: 10.0
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0xff, 0x7f, // third sample: 4e4 (saturated)
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0, 0x80, // fourth sample: -1e9 (saturated)
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};
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static const size_t kContentSize =
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kWavHeaderSize + kNumSamples * sizeof(int16_t);
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static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
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EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
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FILE* f = fopen(outfile.c_str(), "rb");
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ASSERT_TRUE(f);
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uint8_t contents[kContentSize];
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ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
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EXPECT_EQ(0, fclose(f));
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EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
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}
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// Write a larger WAV file. You can listen to this file to sanity-check it.
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TEST(WavWriterTest, LargeFile) {
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std::string outfile = test::OutputPath() + "wavtest3.wav";
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static const int kSampleRate = 8000;
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static const size_t kNumChannels = 2;
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static const size_t kNumSamples = 3 * kSampleRate * kNumChannels;
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float samples[kNumSamples];
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for (size_t i = 0; i < kNumSamples; i += kNumChannels) {
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// A nice periodic beeping sound.
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static const double kToneHz = 440;
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const double t = static_cast<double>(i) / (kNumChannels * kSampleRate);
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const double x =
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std::numeric_limits<int16_t>::max() * std::sin(t * kToneHz * 2 * M_PI);
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samples[i] = std::pow(std::sin(t * 2 * 2 * M_PI), 10) * x;
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samples[i + 1] = std::pow(std::cos(t * 2 * 2 * M_PI), 10) * x;
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}
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{
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WavWriter w(outfile, kSampleRate, kNumChannels);
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EXPECT_EQ(kSampleRate, w.sample_rate());
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EXPECT_EQ(kNumChannels, w.num_channels());
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EXPECT_EQ(0u, w.num_samples());
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w.WriteSamples(samples, kNumSamples);
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EXPECT_EQ(kNumSamples, w.num_samples());
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}
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EXPECT_EQ(sizeof(int16_t) * kNumSamples + kWavHeaderSize,
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test::GetFileSize(outfile));
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{
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WavReader r(outfile);
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EXPECT_EQ(kSampleRate, r.sample_rate());
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EXPECT_EQ(kNumChannels, r.num_channels());
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EXPECT_EQ(kNumSamples, r.num_samples());
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float read_samples[kNumSamples];
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EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
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for (size_t i = 0; i < kNumSamples; ++i)
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EXPECT_NEAR(samples[i], read_samples[i], 1);
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EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
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}
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}
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} // namespace webrtc
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