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/*
* Copyright (c) 2012 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.
*/
// Unit tests for DtmfToneGenerator class.
#include "modules/audio_coding/neteq/dtmf_tone_generator.h"
#include <math.h>
#include "common_audio/include/audio_util.h"
#include "modules/audio_coding/neteq/audio_multi_vector.h"
#include "rtc_base/strings/string_builder.h"
#include "test/gtest.h"
namespace webrtc {
class DtmfToneGeneratorTest : public ::testing::Test {
protected:
static const double kLowFreqHz[16];
static const double kHighFreqHz[16];
// This is the attenuation applied to all cases.
const double kBaseAttenuation = 16141.0 / 16384.0;
const double k3dbAttenuation = 23171.0 / 32768;
const int kNumSamples = 10;
void TestAllTones(int fs_hz, int channels) {
AudioMultiVector signal(channels);
for (int event = 0; event <= 15; ++event) {
rtc::StringBuilder ss;
ss << "Checking event " << event << " at sample rate " << fs_hz;
SCOPED_TRACE(ss.str());
const int kAttenuation = 0;
ASSERT_EQ(0, tone_gen_.Init(fs_hz, event, kAttenuation));
EXPECT_TRUE(tone_gen_.initialized());
EXPECT_EQ(kNumSamples, tone_gen_.Generate(kNumSamples, &signal));
double f1 = kLowFreqHz[event];
double f2 = kHighFreqHz[event];
const double pi = 3.14159265358979323846;
for (int n = 0; n < kNumSamples; ++n) {
double x = k3dbAttenuation * sin(2.0 * pi * f1 / fs_hz * (-n - 1)) +
sin(2.0 * pi * f2 / fs_hz * (-n - 1));
x *= kBaseAttenuation;
x = ldexp(x, 14); // Scale to Q14.
for (int channel = 0; channel < channels; ++channel) {
EXPECT_NEAR(x, static_cast<double>(signal[channel][n]), 25);
}
}
tone_gen_.Reset();
EXPECT_FALSE(tone_gen_.initialized());
}
}
void TestAmplitudes(int fs_hz, int channels) {
AudioMultiVector signal(channels);
AudioMultiVector ref_signal(channels);
const int event_vec[] = {0, 4, 9, 13}; // Test a few events.
for (int e = 0; e < 4; ++e) {
int event = event_vec[e];
// Create full-scale reference.
ASSERT_EQ(0, tone_gen_.Init(fs_hz, event, 0)); // 0 attenuation.
EXPECT_EQ(kNumSamples, tone_gen_.Generate(kNumSamples, &ref_signal));
// Test every 5 steps (to save time).
for (int attenuation = 1; attenuation <= 63; attenuation += 5) {
rtc::StringBuilder ss;
ss << "Checking event " << event << " at sample rate " << fs_hz;
ss << "; attenuation " << attenuation;
SCOPED_TRACE(ss.str());
ASSERT_EQ(0, tone_gen_.Init(fs_hz, event, attenuation));
EXPECT_EQ(kNumSamples, tone_gen_.Generate(kNumSamples, &signal));
for (int n = 0; n < kNumSamples; ++n) {
double attenuation_factor =
DbToRatio(-static_cast<float>(attenuation));
// Verify that the attenuation is correct.
for (int channel = 0; channel < channels; ++channel) {
EXPECT_NEAR(attenuation_factor * ref_signal[channel][n],
signal[channel][n], 2);
}
}
tone_gen_.Reset();
}
}
}
DtmfToneGenerator tone_gen_;
};
// Low and high frequencies for events 0 through 15.
const double DtmfToneGeneratorTest::kLowFreqHz[16] = {
941.0, 697.0, 697.0, 697.0, 770.0, 770.0, 770.0, 852.0,
852.0, 852.0, 941.0, 941.0, 697.0, 770.0, 852.0, 941.0};
const double DtmfToneGeneratorTest::kHighFreqHz[16] = {
1336.0, 1209.0, 1336.0, 1477.0, 1209.0, 1336.0, 1477.0, 1209.0,
1336.0, 1477.0, 1209.0, 1477.0, 1633.0, 1633.0, 1633.0, 1633.0};
TEST_F(DtmfToneGeneratorTest, Test8000Mono) {
TestAllTones(8000, 1);
TestAmplitudes(8000, 1);
}
TEST_F(DtmfToneGeneratorTest, Test16000Mono) {
TestAllTones(16000, 1);
TestAmplitudes(16000, 1);
}
TEST_F(DtmfToneGeneratorTest, Test32000Mono) {
TestAllTones(32000, 1);
TestAmplitudes(32000, 1);
}
TEST_F(DtmfToneGeneratorTest, Test48000Mono) {
TestAllTones(48000, 1);
TestAmplitudes(48000, 1);
}
TEST_F(DtmfToneGeneratorTest, Test8000Stereo) {
TestAllTones(8000, 2);
TestAmplitudes(8000, 2);
}
TEST_F(DtmfToneGeneratorTest, Test16000Stereo) {
TestAllTones(16000, 2);
TestAmplitudes(16000, 2);
}
TEST_F(DtmfToneGeneratorTest, Test32000Stereo) {
TestAllTones(32000, 2);
TestAmplitudes(32000, 2);
}
TEST_F(DtmfToneGeneratorTest, Test48000Stereo) {
TestAllTones(48000, 2);
TestAmplitudes(48000, 2);
}
TEST(DtmfToneGenerator, TestErrors) {
DtmfToneGenerator tone_gen;
const int kNumSamples = 10;
AudioMultiVector signal(1); // One channel.
// Try to generate tones without initializing.
EXPECT_EQ(DtmfToneGenerator::kNotInitialized,
tone_gen.Generate(kNumSamples, &signal));
const int fs = 16000; // Valid sample rate.
const int event = 7; // Valid event.
const int attenuation = 0; // Valid attenuation.
// Initialize with invalid event -1.
EXPECT_EQ(DtmfToneGenerator::kParameterError,
tone_gen.Init(fs, -1, attenuation));
// Initialize with invalid event 16.
EXPECT_EQ(DtmfToneGenerator::kParameterError,
tone_gen.Init(fs, 16, attenuation));
// Initialize with invalid attenuation -1.
EXPECT_EQ(DtmfToneGenerator::kParameterError, tone_gen.Init(fs, event, -1));
// Initialize with invalid attenuation 64.
EXPECT_EQ(DtmfToneGenerator::kParameterError, tone_gen.Init(fs, event, 64));
EXPECT_FALSE(tone_gen.initialized()); // Should still be uninitialized.
// Initialize with valid parameters.
ASSERT_EQ(0, tone_gen.Init(fs, event, attenuation));
EXPECT_TRUE(tone_gen.initialized());
// NULL pointer to destination.
EXPECT_EQ(DtmfToneGenerator::kParameterError,
tone_gen.Generate(kNumSamples, NULL));
}
} // namespace webrtc
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